feat(config): add [web]/[web.oidc] config + operations/audit.py (W3)

src/ci_orchestrator/config.py

@@ -78,6 +78,40 @@ class CargoCacheConfig:
     retention_days: int = 30
 
 
+@dataclass(frozen=True)
+class WebOidcConfig:
+    """Gitea OIDC client settings for the web UI.
+
+    ``client_secret_cred`` is a **keyring key name**, never the secret
+    itself — the actual client secret is set out-of-band via
+    ``ci creds set`` and read from :class:`~ci_orchestrator.credentials.
+    KeyringCredentialStore` at request time.
+    """
+
+    issuer: str
+    client_id: str
+    redirect_url: str
+    client_secret_cred: str = "WebOidcClientSecret"
+    scopes: list[str] = field(default_factory=lambda: ["openid", "profile"])
+
+
+@dataclass(frozen=True)
+class WebConfig:
+    """Web UI settings (``ci web serve``). Disabled by default.
+
+    ``session_secret_cred`` is a **keyring key name**, never the secret
+    itself — same pattern as :attr:`WebOidcConfig.client_secret_cred`.
+    """
+
+    enabled: bool = False
+    bind_host: str = "127.0.0.1"
+    bind_port: int = 8800
+    audit_log: Path = Path("/var/lib/ci/logs/web-audit.jsonl")
+    allowed_users: list[str] = field(default_factory=list)
+    session_secret_cred: str = "WebSessionSecret"
+    oidc: WebOidcConfig | None = None
+
+
 @dataclass(frozen=True)
 class Config:
     """Top-level configuration object."""
@@ -89,6 +123,7 @@ class Config:
     guest_cred_target: str = "BuildVMGuest"
     ip_pool: IpPoolConfig | None = None
     cargo_cache: CargoCacheConfig = field(default_factory=CargoCacheConfig)
+    web: WebConfig = field(default_factory=WebConfig)
 
 
 def _platform_defaults() -> Paths:
@@ -137,6 +172,45 @@ def _apply_env(paths: Paths, env: dict[str, str]) -> Paths:
     return _merge_paths(paths, overrides)
 
 
+def _parse_web_oidc(oidc_section: dict[str, Any]) -> WebOidcConfig | None:
+    """Parse ``[web.oidc]``. Missing required keys degrade to ``None`` -- never raise."""
+    if not oidc_section:
+        return None
+    issuer = oidc_section.get("issuer")
+    client_id = oidc_section.get("client_id")
+    redirect_url = oidc_section.get("redirect_url")
+    if not issuer or not client_id or not redirect_url:
+        return None
+
+    scopes = oidc_section.get("scopes")
+    return WebOidcConfig(
+        issuer=str(issuer),
+        client_id=str(client_id),
+        redirect_url=str(redirect_url),
+        client_secret_cred=str(oidc_section.get("client_secret_cred", "WebOidcClientSecret")),
+        scopes=[str(s) for s in scopes] if isinstance(scopes, list) else ["openid", "profile"],
+    )
+
+
+def _parse_web_config(web_section: dict[str, Any]) -> WebConfig:
+    """Parse ``[web]`` (and nested ``[web.oidc]``). Absent section -> disabled defaults."""
+    if not web_section:
+        return WebConfig()
+
+    allowed_users = web_section.get("allowed_users")
+    audit_log = web_section.get("audit_log")
+
+    return WebConfig(
+        enabled=bool(web_section.get("enabled", False)),
+        bind_host=str(web_section.get("bind_host", "127.0.0.1")),
+        bind_port=int(web_section.get("bind_port", 8800)),
+        audit_log=Path(audit_log) if audit_log else WebConfig().audit_log,
+        allowed_users=[str(u) for u in allowed_users] if isinstance(allowed_users, list) else [],
+        session_secret_cred=str(web_section.get("session_secret_cred", "WebSessionSecret")),
+        oidc=_parse_web_oidc(web_section.get("oidc", {}) or {}),
+    )
+
+
 def load_config(
     config_path: Path | None = None,
     env: dict[str, str] | None = None,
@@ -173,6 +247,7 @@ def load_config(
     guest_cred_target = env.get("CI_GUEST_CRED_TARGET", "BuildVMGuest")
     ip_pool: IpPoolConfig | None = None
     cargo_cache_section: dict[str, Any] = {}
+    web_section: dict[str, Any] = {}
 
     if toml_path and toml_path.is_file():
         data = _load_toml(toml_path)
@@ -203,6 +278,7 @@ def load_config(
                     lease_file=Path(pool_section.get("lease_file") or _lease_default),
                 )
         cargo_cache_section = data.get("cargo_cache", {}) or {}
+        web_section = data.get("web", {}) or {}
 
     paths = _apply_env(paths, env)
 
@@ -214,6 +290,8 @@ def load_config(
         retention_days=int(cargo_cache_section.get("retention_days", 30)),
     )
 
+    web = _parse_web_config(web_section)
+
     return Config(
         paths=paths,
         backend=backend,
@@ -222,6 +300,7 @@ def load_config(
         guest_cred_target=guest_cred_target,
         ip_pool=ip_pool,
         cargo_cache=cargo_cache,
+        web=web,
     )
 
 
@@ -231,5 +310,7 @@ __all__ = [
     "Config",
     "IpPoolConfig",
     "Paths",
+    "WebConfig",
+    "WebOidcConfig",
     "load_config",
 ]

src/ci_orchestrator/operations/audit.py

@@ -0,0 +1,93 @@
+"""Pure audit-trail operations shared by the CLI and (future) web UI.
+
+Append-only JSONL log of mutating actions (VM remove/cleanup, cache purge,
+host backup, ...). Zero ``click``, zero ``print`` — this module only ever
+touches the filesystem and stdlib ``json``. Presentation stays in the CLI
+command wrappers and, later, the web routes.
+
+The log file is append-only by construction: :func:`append_audit` always
+opens in append mode and never truncates, so a crash mid-write can only ever
+corrupt the last line, not earlier history. :func:`read_audit` tolerates
+that: malformed or torn lines are skipped rather than raising.
+"""
+
+from __future__ import annotations
+
+import json
+from dataclasses import asdict, dataclass
+from pathlib import Path
+
+
+@dataclass(frozen=True)
+class AuditEntry:
+    """A single audit-log record for a mutating web-UI/CLI action."""
+
+    ts: str  # ISO 8601 UTC
+    user: str
+    action: str  # "vm.remove" | "vm.cleanup" | "cache.purge" | "host.backup"
+    target: str
+    result: str  # "ok" | "error" | "dry-run"
+    detail: str
+
+
+def append_audit(log_path: Path, entry: AuditEntry) -> None:
+    """Append ``entry`` as one JSON line to ``log_path``. Never truncates.
+
+    Creates the parent directory if needed. Opens in append mode ("a"), so
+    existing content is always preserved.
+    """
+    log_path.parent.mkdir(parents=True, exist_ok=True)
+    with log_path.open("a", encoding="utf-8") as fh:
+        fh.write(json.dumps(asdict(entry)) + "\n")
+
+
+def _parse_line(line: str) -> AuditEntry | None:
+    """Parse one JSONL line into an :class:`AuditEntry`, or ``None`` if malformed."""
+    stripped = line.strip()
+    if not stripped:
+        return None
+    try:
+        data = json.loads(stripped)
+    except json.JSONDecodeError:
+        return None
+    if not isinstance(data, dict):
+        return None
+    try:
+        return AuditEntry(
+            ts=str(data["ts"]),
+            user=str(data["user"]),
+            action=str(data["action"]),
+            target=str(data["target"]),
+            result=str(data["result"]),
+            detail=str(data["detail"]),
+        )
+    except KeyError:
+        return None
+
+
+def read_audit(log_path: Path, *, last: int = 100) -> list[AuditEntry]:
+    """Return up to the last ``last`` entries from ``log_path``, oldest-first.
+
+    Missing file returns ``[]``. Malformed or torn lines (e.g. a crash
+    mid-write) are skipped rather than raising.
+    """
+    if not log_path.is_file():
+        return []
+
+    entries: list[AuditEntry] = []
+    with log_path.open("r", encoding="utf-8") as fh:
+        for line in fh:
+            entry = _parse_line(line)
+            if entry is not None:
+                entries.append(entry)
+
+    if last <= 0:
+        return []
+    return entries[-last:]
+
+
+__all__ = [
+    "AuditEntry",
+    "append_audit",
+    "read_audit",
+]