webui/api/routes.py

"""
Hermes Web UI -- Route handlers for GET and POST endpoints.
Extracted from server.py (Sprint 11) so server.py is a thin shell.
"""

import html as _html
import json
import logging
import os
import queue
import sys
import threading
import time
import uuid
from pathlib import Path
from urllib.parse import parse_qs

logger = logging.getLogger(__name__)

from api.config import (
    STATE_DIR,
    SESSION_DIR,
    DEFAULT_WORKSPACE,
    DEFAULT_MODEL,
    SESSIONS,
    SESSIONS_MAX,
    LOCK,
    STREAMS,
    STREAMS_LOCK,
    CANCEL_FLAGS,
    SERVER_START_TIME,
    CLI_TOOLSETS,
    _INDEX_HTML_PATH,
    get_available_models,
    IMAGE_EXTS,
    MD_EXTS,
    MIME_MAP,
    MAX_FILE_BYTES,
    MAX_UPLOAD_BYTES,
    CHAT_LOCK,
    load_settings,
    save_settings,
)
from api.helpers import (
    require,
    bad,
    safe_resolve,
    j,
    t,
    read_body,
    _security_headers,
    _sanitize_error,
    redact_session_data,
    _redact_text,
)

# ── CSRF: validate Origin/Referer on POST ────────────────────────────────────
import re as _re


def _normalize_host_port(value: str) -> tuple[str, str | None]:
    """Split a host or host:port string into (hostname, port|None).
    Handles IPv6 bracket notation, e.g. [::1]:8080."""
    value = value.strip().lower()
    if not value:
        return '', None
    if value.startswith('['):
        end = value.find(']')
        if end != -1:
            host = value[1:end]
            rest = value[end + 1 :]
            if rest.startswith(':') and rest[1:].isdigit():
                return host, rest[1:]
            return host, None
    if value.count(':') == 1:
        host, port = value.rsplit(':', 1)
        if port.isdigit():
            return host, port
    return value, None


def _ports_match(origin_scheme: str, origin_port: str | None, allowed_port: str | None) -> bool:
    """Return True when two ports should be considered equivalent, scheme-aware.

    Treats an absent port as the scheme default: port 80 for http, port 443 for https.
    Port 80 is NOT treated as equivalent to 443 (different protocols = different origins).
    """
    if origin_port == allowed_port:
        return True
    # Determine the default port for the origin's scheme
    default = '443' if origin_scheme == 'https' else '80'
    if not origin_port and allowed_port == default:
        return True
    if not allowed_port and origin_port == default:
        return True
    return False


def _allowed_public_origins() -> set[str]:
    """Parse HERMES_WEBUI_ALLOWED_ORIGINS env var (comma-separated) into a set.

    Each entry must include the scheme, e.g. https://myapp.example.com:8000.
    Entries without a scheme are silently skipped and a warning is printed.
    """
    raw = os.getenv('HERMES_WEBUI_ALLOWED_ORIGINS', '')
    result = set()
    for value in raw.split(','):
        value = value.strip().rstrip('/').lower()
        if not value:
            continue
        if not (value.startswith('http://') or value.startswith('https://')):
            import sys
            print(
                f"[webui] WARNING: HERMES_WEBUI_ALLOWED_ORIGINS entry {value!r} is missing "
                f"the scheme (expected https://hostname or http://hostname). Entry ignored.",
                flush=True, file=sys.stderr,
            )
            continue
        result.add(value)
    return result


def _check_csrf(handler) -> bool:
    """Reject cross-origin POST requests. Returns True if OK."""
    origin = handler.headers.get("Origin", "")
    referer = handler.headers.get("Referer", "")
    host = handler.headers.get("Host", "")
    if not origin and not referer:
        return True  # non-browser clients (curl, agent) have no Origin
    target = origin or referer
    # Extract host:port from origin/referer
    m = _re.match(r"^https?://([^/]+)", target)
    if not m:
        return False
    origin_host = m.group(1)
    origin_scheme = m.group(0).split('://')[0].lower()  # 'http' or 'https'
    origin_name, origin_port = _normalize_host_port(origin_host)
    # Check against explicitly allowed public origins (env var)
    origin_value = m.group(0).rstrip('/').lower()
    if origin_value in _allowed_public_origins():
        return True
    # Allow same-origin: check Host, X-Forwarded-Host (reverse proxy), and
    # X-Real-Host against the origin. Reverse proxies (Caddy, nginx) set
    # X-Forwarded-Host to the client's original Host header.
    allowed_hosts = [
        h.strip()
        for h in [
            host,
            handler.headers.get("X-Forwarded-Host", ""),
            handler.headers.get("X-Real-Host", ""),
        ]
        if h.strip()
    ]
    for allowed in allowed_hosts:
        allowed_name, allowed_port = _normalize_host_port(allowed)
        if origin_name == allowed_name and _ports_match(origin_scheme, origin_port, allowed_port):
            return True
    return False


from api.models import (
    Session,
    get_session,
    new_session,
    all_sessions,
    title_from,
    _write_session_index,
    SESSION_INDEX_FILE,
    load_projects,
    save_projects,
    import_cli_session,
    get_cli_sessions,
    get_cli_session_messages,
)
from api.workspace import (
    load_workspaces,
    save_workspaces,
    get_last_workspace,
    set_last_workspace,
    list_dir,
    read_file_content,
    safe_resolve_ws,
)
from api.upload import handle_upload, handle_transcribe
from api.streaming import _sse, _run_agent_streaming, cancel_stream
from api.onboarding import (
    apply_onboarding_setup,
    get_onboarding_status,
    complete_onboarding,
)

# Approval system (optional -- graceful fallback if agent not available)
try:
    from tools.approval import (
        submit_pending,
        approve_session,
        approve_permanent,
        save_permanent_allowlist,
        is_approved,
        _pending,
        _lock,
        _permanent_approved,
        resolve_gateway_approval,
    )
except ImportError:
    submit_pending = lambda *a, **k: None
    approve_session = lambda *a, **k: None
    approve_permanent = lambda *a, **k: None
    save_permanent_allowlist = lambda *a, **k: None
    is_approved = lambda *a, **k: True
    resolve_gateway_approval = lambda *a, **k: 0
    _pending = {}
    _lock = threading.Lock()
    _permanent_approved = set()


# ── Login page locale strings ─────────────────────────────────────────────────
# Add entries here to support more languages on the login page.
# The key must match the 'language' setting value (from static/i18n.js LOCALES).
_LOGIN_LOCALE = {
    "en": {
        "lang": "en",
        "title": "Sign in",
        "subtitle": "Enter your password to continue",
        "placeholder": "Password",
        "btn": "Sign in",
        "invalid_pw": "Invalid password",
        "conn_failed": "Connection failed",
    },
    "zh": {
        "lang": "zh-CN",
        "title": "\u767b\u5f55",
        "subtitle": "\u8f93\u5165\u5bc6\u7801\u7ee7\u7eed\u4f7f\u7528",
        "placeholder": "\u5bc6\u7801",
        "btn": "\u767b\u5f55",
        "invalid_pw": "\u5bc6\u7801\u9519\u8bef",
        "conn_failed": "\u8fde\u63a5\u5931\u8d25",
    },
}

# ── Login page (self-contained, no external deps) ────────────────────────────
_LOGIN_PAGE_HTML = """<!doctype html>
<html lang="{{LANG}}"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
<title>{{BOT_NAME}} — {{LOGIN_TITLE}}</title>
<style>
*{box-sizing:border-box;margin:0;padding:0}
body{background:#1a1a2e;color:#e8e8f0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  height:100vh;display:flex;align-items:center;justify-content:center}
.card{background:#16213e;border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:36px 32px;
  width:320px;text-align:center;box-shadow:0 8px 32px rgba(0,0,0,.3)}
.logo{width:48px;height:48px;border-radius:12px;background:linear-gradient(145deg,#e8a030,#e94560);
  display:flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;color:#fff;
  margin:0 auto 12px;box-shadow:0 2px 12px rgba(233,69,96,.3)}
h1{font-size:18px;font-weight:600;margin-bottom:4px}
.sub{font-size:12px;color:#8888aa;margin-bottom:24px}
input{width:100%;padding:10px 14px;border-radius:10px;border:1px solid rgba(255,255,255,.1);
  background:rgba(255,255,255,.04);color:#e8e8f0;font-size:14px;outline:none;margin-bottom:14px;
  transition:border-color .15s}
input:focus{border-color:rgba(124,185,255,.5);box-shadow:0 0 0 3px rgba(124,185,255,.1)}
button{width:100%;padding:10px;border-radius:10px;border:none;background:rgba(124,185,255,.15);
  border:1px solid rgba(124,185,255,.3);color:#7cb9ff;font-size:14px;font-weight:600;cursor:pointer;
  transition:all .15s}
button:hover{background:rgba(124,185,255,.25)}
.err{color:#e94560;font-size:12px;margin-top:10px;display:none}
</style></head><body>
<div class="card">
  <div class="logo">{{BOT_NAME_INITIAL}}</div>
  <h1>{{BOT_NAME}}</h1>
  <p class="sub">{{LOGIN_SUBTITLE}}</p>
  <form id="login-form" data-invalid-pw="{{LOGIN_INVALID_PW}}" data-conn-failed="{{LOGIN_CONN_FAILED}}">
    <input type="password" id="pw" placeholder="{{LOGIN_PLACEHOLDER}}" autofocus>
    <button type="submit">{{LOGIN_BTN}}</button>
  </form>
  <div class="err" id="err"></div>
</div>
<script src="/static/login.js"></script>
</body></html>"""

# ── GET routes ────────────────────────────────────────────────────────────────


def handle_get(handler, parsed) -> bool:
    """Handle all GET routes. Returns True if handled, False for 404."""

    if parsed.path in ("/", "/index.html"):
        return t(
            handler,
            _INDEX_HTML_PATH.read_text(encoding="utf-8"),
            content_type="text/html; charset=utf-8",
        )

    if parsed.path == "/login":
        _settings = load_settings()
        _bn = _html.escape(_settings.get("bot_name") or "Hermes")
        _lang = _settings.get("language", "en")
        _login_strings = _LOGIN_LOCALE.get(_lang, _LOGIN_LOCALE["en"])
        _page = (
            _LOGIN_PAGE_HTML.replace("{{BOT_NAME}}", _bn)
            .replace("{{BOT_NAME_INITIAL}}", _bn[0].upper())
            .replace("{{LANG}}", _html.escape(_login_strings["lang"]))
            .replace("{{LOGIN_TITLE}}", _html.escape(_login_strings["title"]))
            .replace("{{LOGIN_SUBTITLE}}", _html.escape(_login_strings["subtitle"]))
            .replace(
                "{{LOGIN_PLACEHOLDER}}", _html.escape(_login_strings["placeholder"])
            )
            .replace("{{LOGIN_BTN}}", _html.escape(_login_strings["btn"]))
            .replace("{{LOGIN_INVALID_PW}}", _html.escape(_login_strings["invalid_pw"]))
            .replace(
                "{{LOGIN_CONN_FAILED}}", _html.escape(_login_strings["conn_failed"])
            )
        )
        return t(handler, _page, content_type="text/html; charset=utf-8")

    if parsed.path == "/api/auth/status":
        from api.auth import is_auth_enabled, parse_cookie, verify_session

        logged_in = False
        if is_auth_enabled():
            cv = parse_cookie(handler)
            logged_in = bool(cv and verify_session(cv))
        return j(handler, {"auth_enabled": is_auth_enabled(), "logged_in": logged_in})

    if parsed.path == "/favicon.ico":
        handler.send_response(204)
        handler.end_headers()
        return True

    if parsed.path == "/health":
        with STREAMS_LOCK:
            n_streams = len(STREAMS)
        return j(
            handler,
            {
                "status": "ok",
                "sessions": len(SESSIONS),
                "active_streams": n_streams,
                "uptime_seconds": round(time.time() - SERVER_START_TIME, 1),
            },
        )

    if parsed.path == "/api/models":
        return j(handler, get_available_models())

    if parsed.path == "/api/models/live":
        return _handle_live_models(handler, parsed)

    if parsed.path == "/api/settings":
        settings = load_settings()
        # Never expose the stored password hash to clients
        settings.pop("password_hash", None)
        return j(handler, settings)

    if parsed.path == "/api/onboarding/status":
        return j(handler, get_onboarding_status())

    if parsed.path.startswith("/static/"):
        return _serve_static(handler, parsed)

    if parsed.path == "/api/session":
        sid = parse_qs(parsed.query).get("session_id", [""])[0]
        if not sid:
            return j(handler, {"error": "session_id is required"}, status=400)
        try:
            s = get_session(sid)
            raw = s.compact() | {
                "messages": s.messages,
                "tool_calls": getattr(s, "tool_calls", []),
                "active_stream_id": getattr(s, "active_stream_id", None),
                "pending_user_message": getattr(s, "pending_user_message", None),
                "pending_attachments": getattr(s, "pending_attachments", []),
                "pending_started_at": getattr(s, "pending_started_at", None),
            }
            return j(handler, {"session": redact_session_data(raw)})
        except KeyError:
            # Not a WebUI session -- try CLI store
            msgs = get_cli_session_messages(sid)
            if msgs:
                cli_meta = None
                for cs in get_cli_sessions():
                    if cs["session_id"] == sid:
                        cli_meta = cs
                        break
                sess = {
                    "session_id": sid,
                    "title": (cli_meta or {}).get("title", "CLI Session"),
                    "workspace": (cli_meta or {}).get("workspace", ""),
                    "model": (cli_meta or {}).get("model", "unknown"),
                    "message_count": len(msgs),
                    "created_at": (cli_meta or {}).get("created_at", 0),
                    "updated_at": (cli_meta or {}).get("updated_at", 0),
                    "pinned": False,
                    "archived": False,
                    "project_id": None,
                    "profile": (cli_meta or {}).get("profile"),
                    "is_cli_session": True,
                    "messages": msgs,
                    "tool_calls": [],
                }
                return j(handler, {"session": redact_session_data(sess)})
            return bad(handler, "Session not found", 404)

    if parsed.path == "/api/sessions":
        webui_sessions = all_sessions()
        settings = load_settings()
        if settings.get("show_cli_sessions"):
            cli = get_cli_sessions()
            webui_ids = {s["session_id"] for s in webui_sessions}
            deduped_cli = [s for s in cli if s["session_id"] not in webui_ids]
        else:
            deduped_cli = []
        merged = webui_sessions + deduped_cli
        merged.sort(key=lambda s: s.get("updated_at", 0) or 0, reverse=True)
        # Redact credentials from session titles before returning
        for s in merged:
            if isinstance(s.get("title"), str):
                s["title"] = _redact_text(s["title"])
        return j(handler, {"sessions": merged, "cli_count": len(deduped_cli)})

    if parsed.path == "/api/projects":
        return j(handler, {"projects": load_projects()})

    if parsed.path == "/api/session/export":
        return _handle_session_export(handler, parsed)

    if parsed.path == "/api/workspaces":
        return j(
            handler, {"workspaces": load_workspaces(), "last": get_last_workspace()}
        )

    if parsed.path == "/api/sessions/search":
        return _handle_sessions_search(handler, parsed)

    if parsed.path == "/api/list":
        return _handle_list_dir(handler, parsed)

    if parsed.path == "/api/personalities":
        # Read personalities from config.yaml agent.personalities section
        # (matches hermes-agent CLI behavior, not filesystem SOUL.md approach)
        from api.config import reload_config as _reload_cfg

        _reload_cfg()  # pick up config.yaml changes without server restart
        from api.config import get_config as _get_cfg

        _cfg = _get_cfg()
        agent_cfg = _cfg.get("agent", {})
        raw_personalities = agent_cfg.get("personalities", {})
        personalities = []
        if isinstance(raw_personalities, dict):
            for name, value in raw_personalities.items():
                desc = ""
                if isinstance(value, dict):
                    desc = value.get("description", "")
                elif isinstance(value, str):
                    desc = value[:80] + ("..." if len(value) > 80 else "")
                personalities.append({"name": name, "description": desc})
        return j(handler, {"personalities": personalities})

    if parsed.path == "/api/git-info":
        qs = parse_qs(parsed.query)
        sid = qs.get("session_id", [""])[0]
        if not sid:
            return bad(handler, "session_id required")
        try:
            s = get_session(sid)
        except KeyError:
            return bad(handler, "Session not found", 404)
        from api.workspace import git_info_for_workspace

        info = git_info_for_workspace(Path(s.workspace))
        return j(handler, {"git": info})

    if parsed.path == "/api/updates/check":
        settings = load_settings()
        if not settings.get("check_for_updates", True):
            return j(handler, {"disabled": True})
        qs = parse_qs(parsed.query)
        force = qs.get("force", ["0"])[0] == "1"
        # ?simulate=1 returns fake behind counts for UI testing (localhost only)
        if (
            qs.get("simulate", ["0"])[0] == "1"
            and handler.client_address[0] == "127.0.0.1"
        ):
            return j(
                handler,
                {
                    "webui": {
                        "name": "webui",
                        "behind": 3,
                        "current_sha": "abc1234",
                        "latest_sha": "def5678",
                        "branch": "master",
                    },
                    "agent": {
                        "name": "agent",
                        "behind": 1,
                        "current_sha": "aaa0001",
                        "latest_sha": "bbb0002",
                        "branch": "master",
                    },
                    "checked_at": 0,
                },
            )
        from api.updates import check_for_updates

        return j(handler, check_for_updates(force=force))

    if parsed.path == "/api/chat/stream/status":
        stream_id = parse_qs(parsed.query).get("stream_id", [""])[0]
        return j(handler, {"active": stream_id in STREAMS, "stream_id": stream_id})

    if parsed.path == "/api/chat/cancel":
        stream_id = parse_qs(parsed.query).get("stream_id", [""])[0]
        if not stream_id:
            return bad(handler, "stream_id required")
        cancelled = cancel_stream(stream_id)
        return j(handler, {"ok": True, "cancelled": cancelled, "stream_id": stream_id})

    if parsed.path == "/api/chat/stream":
        return _handle_sse_stream(handler, parsed)

    if parsed.path == '/api/sessions/gateway/stream':
        return _handle_gateway_sse_stream(handler)

    if parsed.path == "/api/file/raw":
        return _handle_file_raw(handler, parsed)

    if parsed.path == "/api/file":
        return _handle_file_read(handler, parsed)

    if parsed.path == "/api/approval/pending":
        return _handle_approval_pending(handler, parsed)

    if parsed.path == "/api/approval/inject_test":
        # Loopback-only: used by automated tests; blocked from any remote client
        if handler.client_address[0] != "127.0.0.1":
            return j(handler, {"error": "not found"}, status=404)
        return _handle_approval_inject(handler, parsed)

    # ── Cron API (GET) ──
    if parsed.path == "/api/crons":
        from cron.jobs import list_jobs

        return j(handler, {"jobs": list_jobs(include_disabled=True)})

    if parsed.path == "/api/crons/output":
        return _handle_cron_output(handler, parsed)

    if parsed.path == "/api/crons/recent":
        return _handle_cron_recent(handler, parsed)

    # ── Skills API (GET) ──
    if parsed.path == "/api/skills":
        from tools.skills_tool import skills_list as _skills_list

        raw = _skills_list()
        data = json.loads(raw) if isinstance(raw, str) else raw
        return j(handler, {"skills": data.get("skills", [])})

    if parsed.path == "/api/skills/content":
        from tools.skills_tool import skill_view as _skill_view, SKILLS_DIR

        qs = parse_qs(parsed.query)
        name = qs.get("name", [""])[0]
        if not name:
            return j(handler, {"error": "name required"}, status=400)
        file_path = qs.get("file", [""])[0]
        if file_path:
            # Serve a linked file from the skill directory
            import re as _re

            if _re.search(r"[*?\[\]]", name):
                return bad(handler, "Invalid skill name", 400)
            skill_dir = None
            for p in SKILLS_DIR.rglob(name):
                if p.is_dir():
                    skill_dir = p
                    break
            if not skill_dir:
                return bad(handler, "Skill not found", 404)
            target = (skill_dir / file_path).resolve()
            try:
                target.relative_to(skill_dir.resolve())
            except ValueError:
                return bad(handler, "Invalid file path", 400)
            if not target.exists() or not target.is_file():
                return bad(handler, "File not found", 404)
            return j(
                handler,
                {"content": target.read_text(encoding="utf-8"), "path": file_path},
            )
        raw = _skill_view(name)
        data = json.loads(raw) if isinstance(raw, str) else raw
        if "linked_files" not in data:
            data["linked_files"] = {}
        return j(handler, data)

    # ── Memory API (GET) ──
    if parsed.path == "/api/memory":
        return _handle_memory_read(handler)

    # ── Profile API (GET) ──
    if parsed.path == "/api/profiles":
        from api.profiles import list_profiles_api, get_active_profile_name

        return j(
            handler,
            {"profiles": list_profiles_api(), "active": get_active_profile_name()},
        )

    if parsed.path == "/api/profile/active":
        from api.profiles import get_active_profile_name, get_active_hermes_home

        return j(
            handler,
            {"name": get_active_profile_name(), "path": str(get_active_hermes_home())},
        )

    return False  # 404


# ── POST routes ───────────────────────────────────────────────────────────────


def handle_post(handler, parsed) -> bool:
    """Handle all POST routes. Returns True if handled, False for 404."""
    # CSRF: reject cross-origin browser requests
    if not _check_csrf(handler):
        return j(handler, {"error": "Cross-origin request rejected"}, status=403)

    if parsed.path == "/api/upload":
        return handle_upload(handler)

    if parsed.path == "/api/transcribe":
        return handle_transcribe(handler)

    body = read_body(handler)

    if parsed.path == "/api/session/new":
        s = new_session(workspace=body.get("workspace"), model=body.get("model"))
        return j(handler, {"session": s.compact() | {"messages": s.messages}})

    if parsed.path == "/api/sessions/cleanup":
        return _handle_sessions_cleanup(handler, body, zero_only=False)

    if parsed.path == "/api/sessions/cleanup_zero_message":
        return _handle_sessions_cleanup(handler, body, zero_only=True)

    if parsed.path == "/api/session/rename":
        try:
            require(body, "session_id", "title")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        s.title = str(body["title"]).strip()[:80] or "Untitled"
        s.save()
        return j(handler, {"session": s.compact()})

    if parsed.path == "/api/personality/set":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        if "name" not in body:
            return bad(handler, "Missing required field: name")
        sid = body["session_id"]
        name = body["name"].strip()
        try:
            s = get_session(sid)
        except KeyError:
            return bad(handler, "Session not found", 404)
        # Resolve personality from config.yaml agent.personalities section
        # (matches hermes-agent CLI behavior)
        prompt = ""
        if name:
            from api.config import reload_config as _reload_cfg2

            _reload_cfg2()  # pick up config changes without restart
            from api.config import get_config as _get_cfg2

            _cfg2 = _get_cfg2()
            agent_cfg = _cfg2.get("agent", {})
            raw_personalities = agent_cfg.get("personalities", {})
            if not isinstance(raw_personalities, dict) or name not in raw_personalities:
                return bad(
                    handler, f'Personality "{name}" not found in config.yaml', 404
                )
            value = raw_personalities[name]
            # Resolve prompt using the same logic as hermes-agent cli.py
            if isinstance(value, dict):
                parts = [value.get("system_prompt", "") or value.get("prompt", "")]
                if value.get("tone"):
                    parts.append(f"Tone: {value['tone']}")
                if value.get("style"):
                    parts.append(f"Style: {value['style']}")
                prompt = "\n".join(p for p in parts if p)
            else:
                prompt = str(value)
        s.personality = name if name else None
        s.save()
        return j(handler, {"ok": True, "personality": s.personality, "prompt": prompt})

    if parsed.path == "/api/session/update":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        new_ws = str(Path(body.get("workspace", s.workspace)).expanduser().resolve())
        s.workspace = new_ws
        s.model = body.get("model", s.model)
        s.save()
        set_last_workspace(new_ws)
        return j(handler, {"session": s.compact() | {"messages": s.messages}})

    if parsed.path == "/api/session/delete":
        sid = body.get("session_id", "")
        if not sid:
            return bad(handler, "session_id is required")
        # Delete from WebUI session store
        with LOCK:
            SESSIONS.pop(sid, None)
        p = SESSION_DIR / f"{sid}.json"
        try:
            p.unlink(missing_ok=True)
        except Exception:
            logger.debug("Failed to unlink session file %s", p)
        try:
            SESSION_INDEX_FILE.unlink(missing_ok=True)
        except Exception:
            logger.debug("Failed to unlink session index")
        # Also delete from CLI state.db (for CLI sessions shown in sidebar)
        try:
            from api.models import delete_cli_session

            delete_cli_session(sid)
        except Exception:
            logger.debug("Failed to delete CLI session %s", sid)
        return j(handler, {"ok": True})

    if parsed.path == "/api/session/clear":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        s.messages = []
        s.tool_calls = []
        s.title = "Untitled"
        s.save()
        return j(handler, {"ok": True, "session": s.compact()})

    if parsed.path == "/api/session/truncate":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        if body.get("keep_count") is None:
            return bad(handler, "Missing required field(s): keep_count")
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        keep = int(body["keep_count"])
        s.messages = s.messages[:keep]
        s.save()
        return j(
            handler, {"ok": True, "session": s.compact() | {"messages": s.messages}}
        )

    if parsed.path == "/api/chat/start":
        return _handle_chat_start(handler, body)

    if parsed.path == "/api/chat":
        return _handle_chat_sync(handler, body)

    # ── Cron API (POST) ──
    if parsed.path == "/api/crons/create":
        return _handle_cron_create(handler, body)

    if parsed.path == "/api/crons/update":
        return _handle_cron_update(handler, body)

    if parsed.path == "/api/crons/delete":
        return _handle_cron_delete(handler, body)

    if parsed.path == "/api/crons/run":
        return _handle_cron_run(handler, body)

    if parsed.path == "/api/crons/pause":
        return _handle_cron_pause(handler, body)

    if parsed.path == "/api/crons/resume":
        return _handle_cron_resume(handler, body)

    # ── File ops (POST) ──
    if parsed.path == "/api/file/delete":
        return _handle_file_delete(handler, body)

    if parsed.path == "/api/file/save":
        return _handle_file_save(handler, body)

    if parsed.path == "/api/file/create":
        return _handle_file_create(handler, body)

    if parsed.path == "/api/file/rename":
        return _handle_file_rename(handler, body)

    if parsed.path == "/api/file/create-dir":
        return _handle_create_dir(handler, body)

    # ── Workspace management (POST) ──
    if parsed.path == "/api/workspaces/add":
        return _handle_workspace_add(handler, body)

    if parsed.path == "/api/workspaces/remove":
        return _handle_workspace_remove(handler, body)

    if parsed.path == "/api/workspaces/rename":
        return _handle_workspace_rename(handler, body)

    # ── Approval (POST) ──
    if parsed.path == "/api/approval/respond":
        return _handle_approval_respond(handler, body)

    # ── Skills (POST) ──
    if parsed.path == "/api/skills/save":
        return _handle_skill_save(handler, body)

    if parsed.path == "/api/skills/delete":
        return _handle_skill_delete(handler, body)

    # ── Memory (POST) ──
    if parsed.path == "/api/memory/write":
        return _handle_memory_write(handler, body)

    # ── Profile API (POST) ──
    if parsed.path == "/api/profile/switch":
        name = body.get("name", "").strip()
        if not name:
            return bad(handler, "name is required")
        try:
            from api.profiles import switch_profile, _validate_profile_name

            if name != 'default':
                _validate_profile_name(name)
            result = switch_profile(name)
            return j(handler, result)
        except (ValueError, FileNotFoundError) as e:
            return bad(handler, _sanitize_error(e), 404)
        except RuntimeError as e:
            return bad(handler, str(e), 409)

    if parsed.path == "/api/profile/create":
        name = body.get("name", "").strip()
        if not name:
            return bad(handler, "name is required")
        import re as _re

        if not _re.match(r"^[a-z0-9][a-z0-9_-]{0,63}$", name):
            return bad(
                handler,
                "Invalid profile name: lowercase letters, numbers, hyphens, underscores only",
            )
        clone_from = body.get("clone_from")
        if clone_from is not None:
            clone_from = str(clone_from).strip()
            if not _re.match(r"^[a-z0-9][a-z0-9_-]{0,63}$", clone_from):
                return bad(handler, "Invalid clone_from name")
        base_url = body.get("base_url", "").strip() if body.get("base_url") else None
        api_key = body.get("api_key", "").strip() if body.get("api_key") else None
        if base_url and not base_url.startswith(("http://", "https://")):
            return bad(handler, "base_url must start with http:// or https://")
        try:
            from api.profiles import create_profile_api

            result = create_profile_api(
                name,
                clone_from=clone_from,
                clone_config=bool(body.get("clone_config", False)),
                base_url=base_url,
                api_key=api_key,
            )
            return j(handler, {"ok": True, "profile": result})
        except (ValueError, FileExistsError, RuntimeError) as e:
            return bad(handler, str(e))

    if parsed.path == "/api/profile/delete":
        name = body.get("name", "").strip()
        if not name:
            return bad(handler, "name is required")
        try:
            from api.profiles import delete_profile_api, _validate_profile_name

            _validate_profile_name(name)
            result = delete_profile_api(name)
            return j(handler, result)
        except (ValueError, FileNotFoundError) as e:
            return bad(handler, _sanitize_error(e))
        except RuntimeError as e:
            return bad(handler, str(e), 409)

    # ── Settings (POST) ──
    if parsed.path == "/api/settings":
        if "bot_name" in body:
            body["bot_name"] = (str(body["bot_name"]) or "").strip() or "Hermes"
        saved = save_settings(body)
        saved.pop("password_hash", None)  # never expose hash to client
        return j(handler, saved)

    if parsed.path == "/api/onboarding/setup":
        # Writing API keys to disk - restrict to local/private networks unless auth is active.
        # In Docker, requests arrive from the bridge network (172.x.x.x), not 127.0.0.1,
        # even when the user accesses via localhost:8787 on the host.
        # Behind a reverse proxy (nginx/Caddy/Traefik) or SSH tunnel, X-Forwarded-For
        # carries the real origin IP — read it first before falling back to the raw socket addr.
        # HERMES_WEBUI_ONBOARDING_OPEN=1 lets operators on remote servers explicitly bypass
        # the check when they control network access themselves (e.g. firewall + VPN).
        from api.auth import is_auth_enabled
        import os as _os
        if not is_auth_enabled() and not _os.getenv("HERMES_WEBUI_ONBOARDING_OPEN"):
            import ipaddress
            try:
                # Prefer forwarded headers set by reverse proxies
                _xff = handler.headers.get("X-Forwarded-For", "").split(",")[0].strip()
                _xri = handler.headers.get("X-Real-IP", "").strip()
                _raw = handler.client_address[0]
                _ip_str = _xff or _xri or _raw
                addr = ipaddress.ip_address(_ip_str)
                is_local = addr.is_loopback or addr.is_private
            except ValueError:
                is_local = False
            if not is_local:
                return bad(handler, "Onboarding setup is only available from local networks when auth is not enabled. To bypass this on a remote server, set HERMES_WEBUI_ONBOARDING_OPEN=1.", 403)
        try:
            return j(handler, apply_onboarding_setup(body))
        except ValueError as e:
            return bad(handler, str(e))
        except RuntimeError as e:
            return bad(handler, str(e), 500)

    if parsed.path == "/api/onboarding/complete":
        return j(handler, complete_onboarding())

    # ── Session pin (POST) ──
    if parsed.path == "/api/session/pin":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        s.pinned = bool(body.get("pinned", True))
        s.save()
        return j(handler, {"ok": True, "session": s.compact()})

    # ── Session archive (POST) ──
    if parsed.path == "/api/session/archive":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        s.archived = bool(body.get("archived", True))
        s.save()
        return j(handler, {"ok": True, "session": s.compact()})

    # ── Session move to project (POST) ──
    if parsed.path == "/api/session/move":
        try:
            require(body, "session_id")
        except ValueError as e:
            return bad(handler, str(e))
        try:
            s = get_session(body["session_id"])
        except KeyError:
            return bad(handler, "Session not found", 404)
        s.project_id = body.get("project_id") or None
        s.save()
        return j(handler, {"ok": True, "session": s.compact()})

    # ── Project CRUD (POST) ──
    if parsed.path == "/api/projects/create":
        try:
            require(body, "name")
        except ValueError as e:
            return bad(handler, str(e))
        import re as _re

        name = body["name"].strip()[:128]
        if not name:
            return bad(handler, "name required")
        color = body.get("color")
        if color and not _re.match(r"^#[0-9a-fA-F]{3,8}$", color):
            return bad(handler, "Invalid color format")
        projects = load_projects()
        proj = {
            "project_id": uuid.uuid4().hex[:12],
            "name": name,
            "color": color,
            "created_at": time.time(),
        }
        projects.append(proj)
        save_projects(projects)
        return j(handler, {"ok": True, "project": proj})

    if parsed.path == "/api/projects/rename":
        try:
            require(body, "project_id", "name")
        except ValueError as e:
            return bad(handler, str(e))
        import re as _re

        projects = load_projects()
        proj = next(
            (p for p in projects if p["project_id"] == body["project_id"]), None
        )
        if not proj:
            return bad(handler, "Project not found", 404)
        proj["name"] = body["name"].strip()[:128]
        if "color" in body:
            color = body["color"]
            if color and not _re.match(r"^#[0-9a-fA-F]{3,8}$", color):
                return bad(handler, "Invalid color format")
            proj["color"] = color
        save_projects(projects)
        return j(handler, {"ok": True, "project": proj})

    if parsed.path == "/api/projects/delete":
        try:
            require(body, "project_id")
        except ValueError as e:
            return bad(handler, str(e))
        projects = load_projects()
        proj = next(
            (p for p in projects if p["project_id"] == body["project_id"]), None
        )
        if not proj:
            return bad(handler, "Project not found", 404)
        projects = [p for p in projects if p["project_id"] != body["project_id"]]
        save_projects(projects)
        # Unassign all sessions that belonged to this project
        if SESSION_INDEX_FILE.exists():
            try:
                index = json.loads(SESSION_INDEX_FILE.read_text(encoding="utf-8"))
                for entry in index:
                    if entry.get("project_id") == body["project_id"]:
                        try:
                            s = get_session(entry["session_id"])
                            s.project_id = None
                            s.save()
                        except Exception:
                            logger.debug("Failed to update session %s", entry.get("session_id"))
            except Exception:
                logger.debug("Failed to load session index for project unlink")
        return j(handler, {"ok": True})

    # ── Session import from JSON (POST) ──
    if parsed.path == "/api/session/import":
        return _handle_session_import(handler, body)

    # ── Self-update (POST) ──
    if parsed.path == "/api/updates/apply":
        target = body.get("target", "")
        if target not in ("webui", "agent"):
            return bad(handler, 'target must be "webui" or "agent"')
        from api.updates import apply_update

        return j(handler, apply_update(target))

    # ── CLI session import (POST) ──
    if parsed.path == "/api/session/import_cli":
        return _handle_session_import_cli(handler, body)

    # ── Auth endpoints (POST) ──
    if parsed.path == "/api/auth/login":
        from api.auth import (
            verify_password,
            create_session,
            set_auth_cookie,
            is_auth_enabled,
        )
        from api.auth import _check_login_rate, _record_login_attempt

        if not is_auth_enabled():
            return j(handler, {"ok": True, "message": "Auth not enabled"})
        client_ip = handler.client_address[0]
        if not _check_login_rate(client_ip):
            return j(
                handler,
                {"error": "Too many attempts. Try again in a minute."},
                status=429,
            )
        password = body.get("password", "")
        if not verify_password(password):
            _record_login_attempt(client_ip)
            return bad(handler, "Invalid password", 401)
        cookie_val = create_session()
        handler.send_response(200)
        handler.send_header("Content-Type", "application/json")
        handler.send_header("Cache-Control", "no-store")
        _security_headers(handler)
        set_auth_cookie(handler, cookie_val)
        handler.end_headers()
        handler.wfile.write(json.dumps({"ok": True}).encode())
        return True

    if parsed.path == "/api/auth/logout":
        from api.auth import clear_auth_cookie, invalidate_session, parse_cookie

        cookie_val = parse_cookie(handler)
        if cookie_val:
            invalidate_session(cookie_val)
        handler.send_response(200)
        handler.send_header("Content-Type", "application/json")
        handler.send_header("Cache-Control", "no-store")
        _security_headers(handler)
        clear_auth_cookie(handler)
        handler.end_headers()
        handler.wfile.write(json.dumps({"ok": True}).encode())
        return True

    return False  # 404


# ── GET route helpers ─────────────────────────────────────────────────────────


def _serve_static(handler, parsed):
    static_root = (Path(__file__).parent.parent / "static").resolve()
    # Strip the leading '/static/' prefix, then resolve and sandbox
    rel = parsed.path[len("/static/") :]
    static_file = (static_root / rel).resolve()
    try:
        static_file.relative_to(static_root)
    except ValueError:
        return j(handler, {"error": "not found"}, status=404)
    if not static_file.exists() or not static_file.is_file():
        return j(handler, {"error": "not found"}, status=404)
    ext = static_file.suffix.lower()
    ct = {"css": "text/css", "js": "application/javascript", "html": "text/html"}.get(
        ext.lstrip("."), "text/plain"
    )
    handler.send_response(200)
    handler.send_header("Content-Type", f"{ct}; charset=utf-8")
    handler.send_header("Cache-Control", "no-store")
    raw = static_file.read_bytes()
    handler.send_header("Content-Length", str(len(raw)))
    handler.end_headers()
    handler.wfile.write(raw)
    return True


def _handle_session_export(handler, parsed):
    sid = parse_qs(parsed.query).get("session_id", [""])[0]
    if not sid:
        return bad(handler, "session_id is required")
    try:
        s = get_session(sid)
    except KeyError:
        return bad(handler, "Session not found", 404)
    safe = redact_session_data(s.__dict__)
    payload = json.dumps(safe, ensure_ascii=False, indent=2)
    handler.send_response(200)
    handler.send_header("Content-Type", "application/json; charset=utf-8")
    handler.send_header(
        "Content-Disposition", f'attachment; filename="hermes-{sid}.json"'
    )
    handler.send_header("Content-Length", str(len(payload.encode("utf-8"))))
    handler.send_header("Cache-Control", "no-store")
    handler.end_headers()
    handler.wfile.write(payload.encode("utf-8"))
    return True


def _handle_sessions_search(handler, parsed):
    qs = parse_qs(parsed.query)
    q = qs.get("q", [""])[0].lower().strip()
    content_search = qs.get("content", ["1"])[0] == "1"
    depth = int(qs.get("depth", ["5"])[0])
    if not q:
        return j(handler, {"sessions": all_sessions()})
    results = []
    for s in all_sessions():
        title_match = q in (s.get("title") or "").lower()
        if title_match:
            results.append(dict(s, match_type="title"))
            continue
        if content_search:
            try:
                sess = get_session(s["session_id"])
                msgs = sess.messages[:depth] if depth else sess.messages
                for m in msgs:
                    c = m.get("content") or ""
                    if isinstance(c, list):
                        c = " ".join(
                            p.get("text", "")
                            for p in c
                            if isinstance(p, dict) and p.get("type") == "text"
                        )
                    if q in str(c).lower():
                        results.append(dict(s, match_type="content"))
                        break
            except (KeyError, Exception):
                pass
    return j(handler, {"sessions": results, "query": q, "count": len(results)})


def _handle_list_dir(handler, parsed):
    qs = parse_qs(parsed.query)
    sid = qs.get("session_id", [""])[0]
    if not sid:
        return bad(handler, "session_id is required")
    try:
        s = get_session(sid)
        workspace = s.workspace
    except KeyError:
        # Fallback for CLI sessions not loaded in WebUI memory
        try:
            cli_meta = None
            for cs in get_cli_sessions():
                if cs["session_id"] == sid:
                    cli_meta = cs
                    break
            if not cli_meta:
                return bad(handler, "Session not found", 404)
            workspace = cli_meta.get("workspace", "")
        except Exception:
            return bad(handler, "Session not found", 404)
    try:
        return j(
            handler,
            {
                "entries": list_dir(Path(workspace), qs.get("path", ["."])[0]),
                "path": qs.get("path", ["."])[0],
            },
        )
    except (FileNotFoundError, ValueError) as e:
        return bad(handler, _sanitize_error(e), 404)


def _handle_sse_stream(handler, parsed):
    stream_id = parse_qs(parsed.query).get("stream_id", [""])[0]
    q = STREAMS.get(stream_id)
    if q is None:
        return j(handler, {"error": "stream not found"}, status=404)
    handler.send_response(200)
    handler.send_header("Content-Type", "text/event-stream; charset=utf-8")
    handler.send_header("Cache-Control", "no-cache")
    handler.send_header("X-Accel-Buffering", "no")
    handler.send_header("Connection", "keep-alive")
    handler.end_headers()
    try:
        while True:
            try:
                event, data = q.get(timeout=30)
            except queue.Empty:
                handler.wfile.write(b": heartbeat\n\n")
                handler.wfile.flush()
                continue
            _sse(handler, event, data)
            if event in ("done", "error", "cancel"):
                break
    except (BrokenPipeError, ConnectionResetError):
        pass
    return True


def _handle_gateway_sse_stream(handler):
    """SSE endpoint for real-time gateway session updates.
    Streams change events from the gateway watcher background thread.
    Only active when show_cli_sessions (show_agent_sessions) setting is enabled.
    """
    # Check if the feature is enabled
    settings = load_settings()
    if not settings.get('show_cli_sessions'):
        return j(handler, {'error': 'agent sessions not enabled'}, status=404)

    from api.gateway_watcher import get_watcher
    watcher = get_watcher()
    if watcher is None:
        return j(handler, {'error': 'watcher not started'}, status=503)

    handler.send_response(200)
    handler.send_header('Content-Type', 'text/event-stream; charset=utf-8')
    handler.send_header('Cache-Control', 'no-cache')
    handler.send_header('X-Accel-Buffering', 'no')
    handler.send_header('Connection', 'keep-alive')
    handler.end_headers()

    q = watcher.subscribe()
    try:
        # Send initial snapshot immediately
        from api.models import get_cli_sessions
        initial = get_cli_sessions()
        _sse(handler, 'sessions_changed', {'sessions': initial})

        while True:
            try:
                event_data = q.get(timeout=30)
            except queue.Empty:
                handler.wfile.write(b': keepalive\n\n')
                handler.wfile.flush()
                continue
            if event_data is None:
                break  # watcher is stopping
            _sse(handler, event_data.get('type', 'sessions_changed'), event_data)
    except (BrokenPipeError, ConnectionResetError, ConnectionAbortedError):
        pass
    finally:
        watcher.unsubscribe(q)
    return True


def _content_disposition_value(disposition: str, filename: str) -> str:
    """Build a latin-1-safe Content-Disposition value with RFC 5987 filename*."""
    import urllib.parse as _up

    safe_name = Path(filename).name.replace("\r", "").replace("\n", "")
    ascii_fallback = "".join(
        ch if 32 <= ord(ch) < 127 and ch not in {'"', '\\'} else "_"
        for ch in safe_name
    ).strip(" .")
    if not ascii_fallback:
        suffix = Path(safe_name).suffix
        ascii_suffix = "".join(
            ch if 32 <= ord(ch) < 127 and ch not in {'"', '\\'} else "_"
            for ch in suffix
        )
        ascii_fallback = f"download{ascii_suffix}" if ascii_suffix else "download"
    quoted_name = _up.quote(safe_name, safe="")
    return (
        f'{disposition}; filename="{ascii_fallback}"; '
        f"filename*=UTF-8''{quoted_name}"
    )


def _handle_file_raw(handler, parsed):
    qs = parse_qs(parsed.query)
    sid = qs.get("session_id", [""])[0]
    if not sid:
        return bad(handler, "session_id is required")
    try:
        s = get_session(sid)
    except KeyError:
        return bad(handler, "Session not found", 404)
    rel = qs.get("path", [""])[0]
    force_download = qs.get("download", [""])[0] == "1"
    target = safe_resolve(Path(s.workspace), rel)
    if not target.exists() or not target.is_file():
        return j(handler, {"error": "not found"}, status=404)
    ext = target.suffix.lower()
    mime = MIME_MAP.get(ext, "application/octet-stream")
    raw_bytes = target.read_bytes()
    handler.send_response(200)
    handler.send_header("Content-Type", mime)
    handler.send_header("Content-Length", str(len(raw_bytes)))
    handler.send_header("Cache-Control", "no-store")
    # Security: force download for dangerous MIME types to prevent XSS
    dangerous_types = {"text/html", "application/xhtml+xml", "image/svg+xml"}
    if force_download or mime in dangerous_types:
        handler.send_header(
            "Content-Disposition",
            _content_disposition_value("attachment", target.name),
        )
    else:
        handler.send_header(
            "Content-Disposition",
            _content_disposition_value("inline", target.name),
        )
    handler.end_headers()
    handler.wfile.write(raw_bytes)
    return True


def _handle_file_read(handler, parsed):
    qs = parse_qs(parsed.query)
    sid = qs.get("session_id", [""])[0]
    if not sid:
        return bad(handler, "session_id is required")
    try:
        s = get_session(sid)
    except KeyError:
        return bad(handler, "Session not found", 404)
    rel = qs.get("path", [""])[0]
    if not rel:
        return bad(handler, "path is required")
    try:
        return j(handler, read_file_content(Path(s.workspace), rel))
    except (FileNotFoundError, ValueError) as e:
        return bad(handler, _sanitize_error(e), 404)


def _handle_approval_pending(handler, parsed):
    sid = parse_qs(parsed.query).get("session_id", [""])[0]
    with _lock:
        p = _pending.get(sid)
    if p:
        return j(handler, {"pending": dict(p)})
    return j(handler, {"pending": None})


def _handle_approval_inject(handler, parsed):
    """Inject a fake pending approval -- loopback-only, used by automated tests."""
    qs = parse_qs(parsed.query)
    sid = qs.get("session_id", [""])[0]
    key = qs.get("pattern_key", ["test_pattern"])[0]
    cmd = qs.get("command", ["rm -rf /tmp/test"])[0]
    if sid:
        submit_pending(
            sid,
            {
                "command": cmd,
                "pattern_key": key,
                "pattern_keys": [key],
                "description": "test pattern",
            },
        )
        return j(handler, {"ok": True, "session_id": sid})
    return j(handler, {"error": "session_id required"}, status=400)


def _handle_live_models(handler, parsed):
    """Fetch the live model list from a provider's /v1/models endpoint.

    Returns the provider's actual model catalog so the UI can show all
    available models, not just the hardcoded fallback list.

    Query params:
        provider  (optional) — provider ID to fetch for; defaults to active
        base_url  (optional) — override the base URL for the provider

    Providers that don't expose a /v1/models endpoint (Anthropic) are not
    supported here — the caller should fall back to the static list.

    Supported: openai, openrouter, custom (any OpenAI-compatible endpoint).
    """
    import urllib.request as _ur
    import ipaddress as _ip
    import socket as _sock
    from urllib.parse import urlparse as _up

    qs = parse_qs(parsed.query)
    provider = (qs.get("provider", [""])[0] or "").lower().strip()
    base_url_override = (qs.get("base_url", [""])[0] or "").strip()

    try:
        from api.config import get_config as _gc, resolve_model_provider as _rmp
        cfg = _gc()
        active_provider = cfg.get("model", {}).get("provider") or ""
        if not provider:
            provider = active_provider

        # Resolve API key and base URL for this provider
        api_key = None
        base_url = base_url_override or ""
        try:
            from hermes_cli.runtime_provider import resolve_runtime_provider
            rt = resolve_runtime_provider(requested=provider)
            api_key = rt.get("api_key")
            if not base_url:
                base_url = rt.get("base_url") or ""
        except Exception:
            pass

        # Determine the /v1/models endpoint URL
        if not base_url:
            if provider in ("openai", "openai-codex", "copilot"):
                base_url = "https://api.openai.com/v1"
            elif provider == "openrouter":
                base_url = "https://openrouter.ai/api/v1"
            elif provider in ("anthropic",):
                # Anthropic doesn't support /v1/models in a standard way
                return j(handler, {"error": "not_supported", "models": []})
            elif provider in ("google", "gemini"):
                return j(handler, {"error": "not_supported", "models": []})
            else:
                # Generic OpenAI-compatible — try common paths
                base_url = ""

        if not base_url:
            return j(handler, {"error": "no_base_url", "models": []})

        # Build URL safely
        base_url = base_url.rstrip("/")
        if base_url.endswith("/v1"):
            endpoint_url = base_url + "/models"
        elif "/v1" in base_url:
            endpoint_url = base_url.rstrip("/") + "/models"
        else:
            endpoint_url = base_url + "/v1/models"

        # Validate scheme (B310 guard)
        parsed_ep = _up(endpoint_url)
        if parsed_ep.scheme not in ("http", "https"):
            return j(handler, {"error": "invalid_scheme", "models": []}, status=400)

        # SSRF guard: block private IPs (allow known local provider hostnames).
        # Use exact hostname match — NOT substring — to prevent bypass via
        # hostnames like evil-ollama.attacker.com containing "ollama".
        _KNOWN_LOCAL_HOSTS = {"localhost", "127.0.0.1", "0.0.0.0", "::1"}
        if parsed_ep.hostname:
            hostname_lower = (parsed_ep.hostname or "").lower()
            try:
                for _, _, _, _, addr in _sock.getaddrinfo(parsed_ep.hostname, None):
                    addr_obj = _ip.ip_address(addr[0])
                    if addr_obj.is_private or addr_obj.is_loopback:
                        if hostname_lower not in _KNOWN_LOCAL_HOSTS:
                            return j(handler, {"error": "ssrf_blocked", "models": []}, status=400)
            except _sock.gaierror:
                pass

        # Fetch models
        req = _ur.Request(endpoint_url, method="GET")
        req.add_header("User-Agent", "HermesWebUI/1.0")
        if api_key:
            req.add_header("Authorization", f"Bearer {api_key}")
        with _ur.urlopen(req, timeout=8) as resp:  # nosec B310
            raw = resp.read().decode("utf-8")

        import json as _json
        data = _json.loads(raw)
        raw_models = data.get("data") or data.get("models") or []

        # Normalise to {id, label} list; filter to text-generation models
        models = []
        seen = set()
        for m in raw_models:
            if not isinstance(m, dict):
                continue
            mid = m.get("id") or m.get("name") or ""
            if not mid or mid in seen:
                continue
            # Skip embedding/image/audio models for direct providers
            obj_type = (m.get("object") or "").lower()
            if obj_type and obj_type not in ("model",):
                continue
            # Heuristic: skip obvious non-chat models
            if any(skip in mid.lower() for skip in ("embed", "tts", "whisper", "dall-e", "davinci-edit", "babbage", "ada", "curie")):
                continue
            seen.add(mid)
            label = m.get("name") or m.get("display_name") or mid
            # For OpenAI, the id IS the label — clean it up
            if label == mid:
                label = mid.replace("-", " ").replace(".", ".").title()
                # Restore original casing for well-known names
                for known in ("GPT", "o1", "o3", "o4", "gpt"):
                    label = label.replace(known.title(), known)
            models.append({"id": mid, "label": label})

        # Sort: newest (higher version numbers) first via lexicographic sort on reversed id
        models.sort(key=lambda m: m["id"], reverse=True)

        return j(handler, {"provider": provider, "models": models, "count": len(models)})

    except Exception as _e:
        logger.debug("Failed to fetch live models for %s: %s", provider, _e)
        return j(handler, {"error": str(_e), "models": []})


def _handle_cron_output(handler, parsed):
    from cron.jobs import OUTPUT_DIR as CRON_OUT

    qs = parse_qs(parsed.query)
    job_id = qs.get("job_id", [""])[0]
    limit = int(qs.get("limit", ["5"])[0])
    if not job_id:
        return j(handler, {"error": "job_id required"}, status=400)
    out_dir = CRON_OUT / job_id
    outputs = []
    if out_dir.exists():
        files = sorted(out_dir.glob("*.md"), reverse=True)[:limit]
        for f in files:
            try:
                txt = f.read_text(encoding="utf-8", errors="replace")
                outputs.append({"filename": f.name, "content": txt[:8000]})
            except Exception:
                logger.debug("Failed to read cron output file %s", f)
    return j(handler, {"job_id": job_id, "outputs": outputs})


def _handle_cron_recent(handler, parsed):
    """Return cron jobs that have completed since a given timestamp."""
    import datetime

    qs = parse_qs(parsed.query)
    since = float(qs.get("since", ["0"])[0])
    try:
        from cron.jobs import list_jobs

        jobs = list_jobs(include_disabled=True)
        completions = []
        for job in jobs:
            last_run = job.get("last_run_at")
            if not last_run:
                continue
            if isinstance(last_run, str):
                try:
                    ts = datetime.datetime.fromisoformat(
                        last_run.replace("Z", "+00:00")
                    ).timestamp()
                except (ValueError, TypeError):
                    continue
            else:
                ts = float(last_run)
            if ts > since:
                completions.append(
                    {
                        "job_id": job.get("id", ""),
                        "name": job.get("name", "Unknown"),
                        "status": job.get("last_status", "unknown"),
                        "completed_at": ts,
                    }
                )
        return j(handler, {"completions": completions, "since": since})
    except ImportError:
        return j(handler, {"completions": [], "since": since})


def _handle_memory_read(handler):
    try:
        from api.profiles import get_active_hermes_home

        mem_dir = get_active_hermes_home() / "memories"
    except ImportError:
        mem_dir = Path.home() / ".hermes" / "memories"
    mem_file = mem_dir / "MEMORY.md"
    user_file = mem_dir / "USER.md"
    memory = (
        mem_file.read_text(encoding="utf-8", errors="replace")
        if mem_file.exists()
        else ""
    )
    user = (
        user_file.read_text(encoding="utf-8", errors="replace")
        if user_file.exists()
        else ""
    )
    return j(
        handler,
        {
            "memory": _redact_text(memory),
            "user": _redact_text(user),
            "memory_path": str(mem_file),
            "user_path": str(user_file),
            "memory_mtime": mem_file.stat().st_mtime if mem_file.exists() else None,
            "user_mtime": user_file.stat().st_mtime if user_file.exists() else None,
        },
    )


# ── POST route helpers ────────────────────────────────────────────────────────


def _handle_sessions_cleanup(handler, body, zero_only=False):
    cleaned = 0
    for p in SESSION_DIR.glob("*.json"):
        if p.name.startswith("_"):
            continue
        try:
            s = Session.load(p.stem)
            if zero_only:
                should_delete = s and len(s.messages) == 0
            else:
                should_delete = s and s.title == "Untitled" and len(s.messages) == 0
            if should_delete:
                with LOCK:
                    SESSIONS.pop(p.stem, None)
                p.unlink(missing_ok=True)
                cleaned += 1
        except Exception:
            logger.debug("Failed to clean up session file %s", p)
    if SESSION_INDEX_FILE.exists():
        SESSION_INDEX_FILE.unlink(missing_ok=True)
    return j(handler, {"ok": True, "cleaned": cleaned})


def _handle_chat_start(handler, body):
    try:
        require(body, "session_id")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    msg = str(body.get("message", "")).strip()
    if not msg:
        return bad(handler, "message is required")
    attachments = [str(a) for a in (body.get("attachments") or [])][:20]
    workspace = str(Path(body.get("workspace") or s.workspace).expanduser().resolve())
    model = body.get("model") or s.model
    stream_id = uuid.uuid4().hex
    s.workspace = workspace
    s.model = model
    s.active_stream_id = stream_id
    s.pending_user_message = msg
    s.pending_attachments = attachments
    s.pending_started_at = time.time()
    s.save()
    set_last_workspace(workspace)
    q = queue.Queue()
    with STREAMS_LOCK:
        STREAMS[stream_id] = q
    thr = threading.Thread(
        target=_run_agent_streaming,
        args=(s.session_id, msg, model, workspace, stream_id, attachments),
        daemon=True,
    )
    thr.start()
    return j(handler, {"stream_id": stream_id, "session_id": s.session_id})


def _handle_chat_sync(handler, body):
    """Fallback synchronous chat endpoint (POST /api/chat). Not used by frontend."""
    from api.config import _get_session_agent_lock

    s = get_session(body["session_id"])
    msg = str(body.get("message", "")).strip()
    if not msg:
        return j(handler, {"error": "empty message"}, status=400)
    workspace = Path(body.get("workspace") or s.workspace).expanduser().resolve()
    s.workspace = str(workspace)
    s.model = body.get("model") or s.model
    from api.streaming import _ENV_LOCK

    with _ENV_LOCK:
        old_cwd = os.environ.get("TERMINAL_CWD")
        os.environ["TERMINAL_CWD"] = str(workspace)
        old_exec_ask = os.environ.get("HERMES_EXEC_ASK")
        old_session_key = os.environ.get("HERMES_SESSION_KEY")
        os.environ["HERMES_EXEC_ASK"] = "1"
        os.environ["HERMES_SESSION_KEY"] = s.session_id
    try:
        from run_agent import AIAgent

        with CHAT_LOCK:
            from api.config import resolve_model_provider

            _model, _provider, _base_url = resolve_model_provider(s.model)
            # Resolve API key via Hermes runtime provider (matches gateway behaviour)
            _api_key = None
            try:
                from hermes_cli.runtime_provider import resolve_runtime_provider

                _rt = resolve_runtime_provider(requested=_provider)
                _api_key = _rt.get("api_key")
                # Also use runtime provider/base_url if the webui config didn't resolve them
                if not _provider:
                    _provider = _rt.get("provider")
                if not _base_url:
                    _base_url = _rt.get("base_url")
            except Exception as _e:
                print(
                    f"[webui] WARNING: resolve_runtime_provider failed: {_e}",
                    flush=True,
                )
            agent = AIAgent(
                model=_model,
                provider=_provider,
                base_url=_base_url,
                api_key=_api_key,
                platform="cli",
                quiet_mode=True,
                enabled_toolsets=CLI_TOOLSETS,
                session_id=s.session_id,
            )
            workspace_ctx = f"[Workspace: {s.workspace}]\n"
            workspace_system_msg = (
                f"Active workspace at session start: {s.workspace}\n"
                "Every user message is prefixed with [Workspace: /absolute/path] indicating the "
                "workspace the user has selected in the web UI at the time they sent that message. "
                "This tag is the single authoritative source of the active workspace and updates "
                "with every message. It overrides any prior workspace mentioned in this system "
                "prompt, memory, or conversation history. Always use the value from the most recent "
                "[Workspace: ...] tag as your default working directory for ALL file operations: "
                "write_file, read_file, search_files, terminal workdir, and patch. "
                "Never fall back to a hardcoded path when this tag is present."
            )
            from api.streaming import _sanitize_messages_for_api

            result = agent.run_conversation(
                user_message=workspace_ctx + msg,
                system_message=workspace_system_msg,
                conversation_history=_sanitize_messages_for_api(s.messages),
                task_id=s.session_id,
                persist_user_message=msg,
            )
    finally:
        with _ENV_LOCK:
            if old_cwd is None:
                os.environ.pop("TERMINAL_CWD", None)
            else:
                os.environ["TERMINAL_CWD"] = old_cwd
            if old_exec_ask is None:
                os.environ.pop("HERMES_EXEC_ASK", None)
            else:
                os.environ["HERMES_EXEC_ASK"] = old_exec_ask
            if old_session_key is None:
                os.environ.pop("HERMES_SESSION_KEY", None)
            else:
                os.environ["HERMES_SESSION_KEY"] = old_session_key
    s.messages = result.get("messages") or s.messages
    # Only auto-generate title when still default; preserves user renames
    if s.title == "Untitled":
        s.title = title_from(s.messages, s.title)
    s.save()
    # Sync to state.db for /insights (opt-in setting)
    try:
        if load_settings().get("sync_to_insights"):
            from api.state_sync import sync_session_usage

            sync_session_usage(
                session_id=s.session_id,
                input_tokens=s.input_tokens or 0,
                output_tokens=s.output_tokens or 0,
                estimated_cost=s.estimated_cost,
                model=s.model,
                title=s.title,
                message_count=len(s.messages),
            )
    except Exception:
        logger.debug("Failed to update session cost tracking")
    return j(
        handler,
        {
            "answer": result.get("final_response") or "",
            "status": "done" if result.get("completed", True) else "partial",
            "session": s.compact() | {"messages": s.messages},
            "result": {k: v for k, v in result.items() if k != "messages"},
        },
    )


def _handle_cron_create(handler, body):
    try:
        require(body, "prompt", "schedule")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        from cron.jobs import create_job

        job = create_job(
            prompt=body["prompt"],
            schedule=body["schedule"],
            name=body.get("name") or None,
            deliver=body.get("deliver") or "local",
            skills=body.get("skills") or [],
            model=body.get("model") or None,
        )
        return j(handler, {"ok": True, "job": job})
    except Exception as e:
        return j(handler, {"error": str(e)}, status=400)


def _handle_cron_update(handler, body):
    try:
        require(body, "job_id")
    except ValueError as e:
        return bad(handler, str(e))
    from cron.jobs import update_job

    updates = {k: v for k, v in body.items() if k != "job_id" and v is not None}
    job = update_job(body["job_id"], updates)
    if not job:
        return bad(handler, "Job not found", 404)
    return j(handler, {"ok": True, "job": job})


def _handle_cron_delete(handler, body):
    try:
        require(body, "job_id")
    except ValueError as e:
        return bad(handler, str(e))
    from cron.jobs import remove_job

    ok = remove_job(body["job_id"])
    if not ok:
        return bad(handler, "Job not found", 404)
    return j(handler, {"ok": True, "job_id": body["job_id"]})


def _handle_cron_run(handler, body):
    job_id = body.get("job_id", "")
    if not job_id:
        return bad(handler, "job_id required")
    from cron.jobs import get_job
    from cron.scheduler import run_job

    job = get_job(job_id)
    if not job:
        return bad(handler, "Job not found", 404)
    threading.Thread(target=run_job, args=(job,), daemon=True).start()
    return j(handler, {"ok": True, "job_id": job_id, "status": "triggered"})


def _handle_cron_pause(handler, body):
    job_id = body.get("job_id", "")
    if not job_id:
        return bad(handler, "job_id required")
    from cron.jobs import pause_job

    result = pause_job(job_id, reason=body.get("reason"))
    if result:
        return j(handler, {"ok": True, "job": result})
    return bad(handler, "Job not found", 404)


def _handle_cron_resume(handler, body):
    job_id = body.get("job_id", "")
    if not job_id:
        return bad(handler, "job_id required")
    from cron.jobs import resume_job

    result = resume_job(job_id)
    if result:
        return j(handler, {"ok": True, "job": result})
    return bad(handler, "Job not found", 404)


def _handle_file_delete(handler, body):
    try:
        require(body, "session_id", "path")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    try:
        target = safe_resolve(Path(s.workspace), body["path"])
        if not target.exists():
            return bad(handler, "File not found", 404)
        if target.is_dir():
            return bad(handler, "Cannot delete directories via this endpoint")
        target.unlink()
        return j(handler, {"ok": True, "path": body["path"]})
    except (ValueError, PermissionError) as e:
        return bad(handler, _sanitize_error(e))


def _handle_file_save(handler, body):
    try:
        require(body, "session_id", "path")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    try:
        target = safe_resolve(Path(s.workspace), body["path"])
        if not target.exists():
            return bad(handler, "File not found", 404)
        if target.is_dir():
            return bad(handler, "Cannot save: path is a directory")
        target.write_text(body.get("content", ""), encoding="utf-8")
        return j(
            handler, {"ok": True, "path": body["path"], "size": target.stat().st_size}
        )
    except (ValueError, PermissionError) as e:
        return bad(handler, _sanitize_error(e))


def _handle_file_create(handler, body):
    try:
        require(body, "session_id", "path")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    try:
        target = safe_resolve(Path(s.workspace), body["path"])
        if target.exists():
            return bad(handler, "File already exists")
        target.parent.mkdir(parents=True, exist_ok=True)
        target.write_text(body.get("content", ""), encoding="utf-8")
        return j(
            handler, {"ok": True, "path": str(target.relative_to(Path(s.workspace)))}
        )
    except (ValueError, PermissionError) as e:
        return bad(handler, _sanitize_error(e))


def _handle_file_rename(handler, body):
    try:
        require(body, "session_id", "path", "new_name")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    try:
        source = safe_resolve(Path(s.workspace), body["path"])
        if not source.exists():
            return bad(handler, "File not found", 404)
        new_name = body["new_name"].strip()
        if not new_name or "/" in new_name or ".." in new_name:
            return bad(handler, "Invalid file name")
        dest = source.parent / new_name
        if dest.exists():
            return bad(handler, f'A file named "{new_name}" already exists')
        source.rename(dest)
        new_rel = str(dest.relative_to(Path(s.workspace)))
        return j(handler, {"ok": True, "old_path": body["path"], "new_path": new_rel})
    except (ValueError, PermissionError, OSError) as e:
        return bad(handler, _sanitize_error(e))


def _handle_create_dir(handler, body):
    try:
        require(body, "session_id", "path")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        s = get_session(body["session_id"])
    except KeyError:
        return bad(handler, "Session not found", 404)
    try:
        target = safe_resolve(Path(s.workspace), body["path"])
        if target.exists():
            return bad(handler, "Path already exists")
        target.mkdir(parents=True)
        return j(
            handler, {"ok": True, "path": str(target.relative_to(Path(s.workspace)))}
        )
    except (ValueError, PermissionError, OSError) as e:
        return bad(handler, _sanitize_error(e))


def _handle_workspace_add(handler, body):
    path_str = body.get("path", "").strip()
    name = body.get("name", "").strip()
    if not path_str:
        return bad(handler, "path is required")
    p = Path(path_str).expanduser().resolve()
    if not p.exists():
        return bad(handler, f"Path does not exist: {p}")
    if not p.is_dir():
        return bad(handler, f"Path is not a directory: {p}")
    wss = load_workspaces()
    if any(w["path"] == str(p) for w in wss):
        return bad(handler, "Workspace already in list")
    wss.append({"path": str(p), "name": name or p.name})
    save_workspaces(wss)
    return j(handler, {"ok": True, "workspaces": wss})


def _handle_workspace_remove(handler, body):
    path_str = body.get("path", "").strip()
    if not path_str:
        return bad(handler, "path is required")
    wss = load_workspaces()
    wss = [w for w in wss if w["path"] != path_str]
    save_workspaces(wss)
    return j(handler, {"ok": True, "workspaces": wss})


def _handle_workspace_rename(handler, body):
    path_str = body.get("path", "").strip()
    name = body.get("name", "").strip()
    if not path_str or not name:
        return bad(handler, "path and name are required")
    wss = load_workspaces()
    for w in wss:
        if w["path"] == path_str:
            w["name"] = name
            break
    else:
        return bad(handler, "Workspace not found", 404)
    save_workspaces(wss)
    return j(handler, {"ok": True, "workspaces": wss})


def _handle_approval_respond(handler, body):
    sid = body.get("session_id", "")
    if not sid:
        return bad(handler, "session_id is required")
    choice = body.get("choice", "deny")
    if choice not in ("once", "session", "always", "deny"):
        return bad(handler, f"Invalid choice: {choice}")
    # Pop the legacy polling-mode pending entry (no-op when gateway path is active).
    with _lock:
        pending = _pending.pop(sid, None)
    if pending:
        keys = pending.get("pattern_keys") or [pending.get("pattern_key", "")]
        if choice in ("once", "session"):
            for k in keys:
                approve_session(sid, k)
        elif choice == "always":
            for k in keys:
                approve_session(sid, k)
                approve_permanent(k)
            save_permanent_allowlist(_permanent_approved)
    # Unblock the agent thread waiting in the gateway approval queue.
    # This is the primary signal when streaming is active — the agent
    # thread is parked in entry.event.wait() and needs to be woken up.
    resolve_gateway_approval(sid, choice, resolve_all=False)
    return j(handler, {"ok": True, "choice": choice})


def _handle_skill_save(handler, body):
    try:
        require(body, "name", "content")
    except ValueError as e:
        return bad(handler, str(e))
    skill_name = body["name"].strip().lower().replace(" ", "-")
    if not skill_name or "/" in skill_name or ".." in skill_name:
        return bad(handler, "Invalid skill name")
    category = body.get("category", "").strip()
    if category and ("/" in category or ".." in category):
        return bad(handler, "Invalid category")
    from tools.skills_tool import SKILLS_DIR

    if category:
        skill_dir = SKILLS_DIR / category / skill_name
    else:
        skill_dir = SKILLS_DIR / skill_name
    # Validate resolved path stays within SKILLS_DIR
    try:
        skill_dir.resolve().relative_to(SKILLS_DIR.resolve())
    except ValueError:
        return bad(handler, "Invalid skill path")
    skill_dir.mkdir(parents=True, exist_ok=True)
    skill_file = skill_dir / "SKILL.md"
    skill_file.write_text(body["content"], encoding="utf-8")
    return j(handler, {"ok": True, "name": skill_name, "path": str(skill_file)})


def _handle_skill_delete(handler, body):
    try:
        require(body, "name")
    except ValueError as e:
        return bad(handler, str(e))
    from tools.skills_tool import SKILLS_DIR
    import shutil

    matches = list(SKILLS_DIR.rglob(f"{body['name']}/SKILL.md"))
    if not matches:
        return bad(handler, "Skill not found", 404)
    skill_dir = matches[0].parent
    shutil.rmtree(str(skill_dir))
    return j(handler, {"ok": True, "name": body["name"]})


def _handle_memory_write(handler, body):
    try:
        require(body, "section", "content")
    except ValueError as e:
        return bad(handler, str(e))
    try:
        from api.profiles import get_active_hermes_home

        mem_dir = get_active_hermes_home() / "memories"
    except ImportError:
        mem_dir = Path.home() / ".hermes" / "memories"
    mem_dir.mkdir(parents=True, exist_ok=True)
    section = body["section"]
    if section == "memory":
        target = mem_dir / "MEMORY.md"
    elif section == "user":
        target = mem_dir / "USER.md"
    else:
        return bad(handler, 'section must be "memory" or "user"')
    target.write_text(body["content"], encoding="utf-8")
    return j(handler, {"ok": True, "section": section, "path": str(target)})


def _handle_session_import_cli(handler, body):
    """Import a single CLI session into the WebUI store."""
    try:
        require(body, "session_id")
    except ValueError as e:
        return bad(handler, str(e))

    sid = str(body["session_id"])

    # Check if already imported — idempotent
    existing = Session.load(sid)
    if existing:
        return j(
            handler,
            {
                "session": existing.compact()
                | {
                    "messages": existing.messages,
                    "is_cli_session": True,
                },
                "imported": False,
            },
        )

    # Fetch messages from CLI store
    msgs = get_cli_session_messages(sid)
    if not msgs:
        return bad(handler, "Session not found in CLI store", 404)

    # Derive title from first user message
    title = title_from(msgs, "CLI Session")
    model = "unknown"

    # Get profile, model, and timestamps from CLI session metadata
    profile = None
    created_at = None
    updated_at = None
    for cs in get_cli_sessions():
        if cs["session_id"] == sid:
            profile = cs.get("profile")
            model = cs.get("model", "unknown")
            created_at = cs.get("created_at")
            updated_at = cs.get("updated_at")
            break

    s = import_cli_session(
        sid,
        title,
        msgs,
        model,
        profile=profile,
        created_at=created_at,
        updated_at=updated_at,
    )
    s.is_cli_session = True
    s._cli_origin = sid
    s.save(touch_updated_at=False)
    return j(
        handler,
        {
            "session": s.compact()
            | {
                "messages": msgs,
                "is_cli_session": True,
            },
            "imported": True,
        },
    )


def _handle_session_import(handler, body):
    """Import a session from a JSON export. Creates a new session with a new ID."""
    if not body or not isinstance(body, dict):
        return bad(handler, "Request body must be a JSON object")
    messages = body.get("messages")
    if not isinstance(messages, list):
        return bad(handler, 'JSON must contain a "messages" array')
    title = body.get("title", "Imported session")
    workspace = body.get("workspace", str(DEFAULT_WORKSPACE))
    model = body.get("model", DEFAULT_MODEL)
    s = Session(
        title=title,
        workspace=workspace,
        model=model,
        messages=messages,
        tool_calls=body.get("tool_calls", []),
    )
    s.pinned = body.get("pinned", False)
    with LOCK:
        SESSIONS[s.session_id] = s
        SESSIONS.move_to_end(s.session_id)
        while len(SESSIONS) > SESSIONS_MAX:
            SESSIONS.popitem(last=False)
    s.save()
    return j(handler, {"ok": True, "session": s.compact() | {"messages": s.messages}})