Release 0.7.0: email/OTC sign-in (Gitea OAuth retained as fallback)

Replaces the Gitea OAuth gesture as the primary human-auth path (roadmap item #5, SPEC §6.2). Users sign in by entering their email, receiving a six-digit code via the existing SMTP layer, and entering the code on a two-step /login surface. The Gitea OAuth callback remains functional during migration — the new UI links to it as a fallback for users with active OAuth sessions or older invite paths — and is scheduled for removal in a future release once OTC adoption is universal. Existing users are linked by email on first OTC sign- in (gitea_id preserved); new users are provisioned with NULL gitea_id and rely on email as the identity key. The migration introduces backend/migrations/012_otc.sql (otc_codes table + users schema rebuild for nullable gitea_id and a partial unique index on email), two new endpoints (POST /auth/otc/request, POST /auth/otc/verify), bcrypt as a new backend dependency for code hashing, and 11 new tests in test_otc_vertical.py covering the happy path, expired and consumed and wrong codes, the per-email rate limit, the allowlist gate, the OAuth-era link path, fresh provisioning, and prior-code invalidation on re-request. No new secrets are required — the existing SECRET_KEY signs sessions and bcrypt's per-row salt covers the code hashes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-28 00:55:29 -07:00
parent c92730a737
commit 2590c244d6
18 changed files with 1483 additions and 18 deletions
@@ -0,0 +1,96 @@
+"""Outbound OTC email — a thin wrapper over the existing SMTP layer.
+
+The §15.4 notification mailer in `email.py` is purpose-built for
+inbox-driven mail (unsubscribe footers, quiet-hours holds, bundling).
+OTC mail is structurally different: it carries a credential, has no
+inbox row behind it, and ignores user-preferences (a contributor
+who's opted out of every notification still needs to receive the
+code they explicitly requested).
+
+So this module reuses `EmailConfig.from_env()` for the SMTP plumbing
+and the From identity, but writes its own envelope. In dev (no
+SMTP_HOST set), the envelope is logged at INFO level and pushed to
+the same `_SENT` buffer the notification mailer uses, so the
+integration tests can assert on the outbound shape without standing
+up an SMTP server.
+
+The send is synchronous. The `/auth/otc/request` endpoint always
+returns 202 regardless of send outcome — the user-facing surface
+doesn't know whether the SMTP relay was reachable, since revealing
+that would let an attacker probe for valid emails on a tight loop.
+"""
+from __future__ import annotations
+
+import logging
+import smtplib
+from email.message import EmailMessage
+from email.utils import formataddr
+
+from .email import EmailConfig, _SENT
+
+log = logging.getLogger(__name__)
+
+
+def send_otc_email(to_address: str, code: str) -> bool:
+    """Compose and send the one-time-code email. Returns True on the
+    happy path; False on SMTP failure. The notifier-side buffer
+    `_SENT` is appended either way so tests can assert on content.
+
+    The subject and body intentionally avoid branding strings that
+    belong to a deployment — only `EMAIL_FROM_NAME` (operator-supplied
+    via env) lands in the From line. The body names the code, the
+    TTL, and a single instruction line. No tracking pixel, no
+    deep-link query, no embedded JS — plain text only."""
+    cfg = EmailConfig.from_env()
+    subject = f"Your sign-in code for {cfg.from_name}"
+    body = _body(code, cfg)
+    envelope = {
+        "to": to_address,
+        "from": formataddr((cfg.from_name, cfg.from_address)),
+        "subject": subject,
+        "body": body,
+        "kind": "otc",
+    }
+    _SENT.append(envelope)
+
+    if not cfg.enabled:
+        log.info("otc email disabled (EMAIL_ENABLED=0): to=%s", to_address)
+        return True
+    if not cfg.smtp_host:
+        # Dev fallback: surface the code at INFO so the operator can
+        # complete a sign-in flow without an SMTP relay. In production
+        # SMTP_HOST is always set per OHM's overlay.
+        log.info("otc email (stdout fallback): to=%s code=%s", to_address, code)
+        return True
+
+    try:
+        msg = EmailMessage()
+        msg["From"] = envelope["from"]
+        msg["To"] = to_address
+        msg["Subject"] = subject
+        msg.set_content(body)
+        smtp = smtplib.SMTP(cfg.smtp_host, cfg.smtp_port, timeout=30)
+        try:
+            if cfg.smtp_starttls:
+                smtp.starttls()
+            if cfg.smtp_user:
+                smtp.login(cfg.smtp_user, cfg.smtp_password)
+            smtp.send_message(msg)
+        finally:
+            smtp.quit()
+        return True
+    except Exception:
+        log.exception("otc email send failed: to=%s", to_address)
+        return False
+
+
+def _body(code: str, cfg: EmailConfig) -> str:
+    return (
+        f"Your sign-in code is:\n\n"
+        f"    {code}\n\n"
+        f"Enter this code in the sign-in screen to finish signing in.\n"
+        f"The code expires in 10 minutes. If you did not request this,\n"
+        f"you can safely ignore this email — no account was created.\n\n"
+        f"---\n"
+        f"{cfg.from_name} · {cfg.app_url}\n"
+    )