feat(scouts): add GmailConnector
Implements GmailConnector — the first concrete SourceConnector. Wraps existing GmailClient + low-level Gmail API service for metadata-only fetch, trash archive, incremental history polling, and Pub/Sub watch setup. Adds GMAIL_PUBSUB_TOPIC setting (empty string default for dev). Adds 3 passing unit tests (mocked API, no real credentials required). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Roberto
@@ -58,6 +58,11 @@ class Settings(BaseSettings):
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# Prod: https://api.adiuvai.com/api/v1/auth/oauth/google/web-callback
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OAUTH_REDIRECT_URI: str = "http://localhost:8000/api/v1/auth/oauth/google/web-callback"
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# Gmail Pub/Sub topic for push notifications.
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# Full resource name, e.g. "projects/my-project/topics/gmail-push".
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# Leave empty in dev — setup_watch will skip registration gracefully.
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GMAIL_PUBSUB_TOPIC: str = ""
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# Fernet key (URL-safe base64, 32-byte key) for at-rest encryption of OAuth
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# tokens stored in cloud_agent_configs.oauth_token_encrypted.
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# Generate with: from cryptography.fernet import Fernet; Fernet.generate_key()
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195
app/scouts/connectors/gmail.py
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195
app/scouts/connectors/gmail.py
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"""Gmail SourceConnector — wraps the existing GmailClient.
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Responsibilities:
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* list_new: incremental fetch since the scout's stored gmail_history_id
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* fetch_metadata: subject + sender + snippet only (Gmail metadata format)
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* fetch_content: full body text — transient, never persisted by engine
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* archive: move a message to Gmail Trash (recoverable for 30 days)
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* setup_watch / renew_watch: Gmail push notifications via Pub/Sub
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"""
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from __future__ import annotations
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import asyncio
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import logging
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from datetime import datetime, timezone
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from app.config.settings import settings
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from app.integrations import decrypt_token
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from app.integrations.gmail import GmailClient
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from app.scouts.connectors.base import ItemContent, ItemMetadata, ItemRef
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logger = logging.getLogger(__name__)
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def _get_gmail_service(scout):
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"""Return a synchronous Google API client for low-level metadata/history calls."""
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from googleapiclient.discovery import build
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from google.oauth2.credentials import Credentials
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creds_info = decrypt_token(scout.oauth_token_encrypted)
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credentials = Credentials(
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token=creds_info.get("token"),
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refresh_token=creds_info.get("refresh_token"),
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token_uri=creds_info.get("token_uri", "https://oauth2.googleapis.com/token"),
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client_id=creds_info.get("client_id"),
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client_secret=creds_info.get("client_secret"),
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scopes=creds_info.get("scopes"),
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)
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return build("gmail", "v1", credentials=credentials, cache_discovery=False)
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class GmailConnector:
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source_type = "gmail"
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# ── list_new ──────────────────────────────────────────────────────────
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async def list_new(self, scout) -> list[ItemRef]:
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"""Return new message refs since scout.gmail_history_id.
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On first run (gmail_history_id is None/empty), records the current
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historyId without backfilling — avoids flooding the user with old mail.
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Updates scout.gmail_history_id in-place (caller must persist to DB).
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"""
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def _sync() -> tuple[list[ItemRef], str | None]:
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service = _get_gmail_service(scout)
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history_id = scout.gmail_history_id
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refs: list[ItemRef] = []
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new_history_id = history_id
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if history_id:
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resp = (
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service.users()
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.history()
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.list(
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userId="me",
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startHistoryId=history_id,
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historyTypes=["messageAdded"],
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)
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.execute()
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)
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for entry in resp.get("history", []):
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for added in entry.get("messagesAdded", []):
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refs.append(ItemRef(source_msg_ref=added["message"]["id"]))
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new_history_id = resp.get("historyId", history_id)
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else:
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# First run: capture baseline history id without backfilling.
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profile = service.users().getProfile(userId="me").execute()
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new_history_id = profile["historyId"]
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return refs, new_history_id
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refs, new_history_id = await asyncio.to_thread(_sync)
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if new_history_id and new_history_id != scout.gmail_history_id:
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scout.gmail_history_id = new_history_id
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return refs
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# ── fetch_metadata ────────────────────────────────────────────────────
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async def fetch_metadata(self, scout, ref: ItemRef) -> ItemMetadata:
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"""Fetch subject, sender, snippet only — uses Gmail metadata format (no body)."""
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def _sync() -> ItemMetadata:
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service = _get_gmail_service(scout)
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msg = (
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service.users()
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.messages()
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.get(
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userId="me",
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id=ref.source_msg_ref,
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format="metadata",
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metadataHeaders=["Subject", "From", "Date"],
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)
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.execute()
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)
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headers = {
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h["name"]: h["value"]
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for h in msg.get("payload", {}).get("headers", [])
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}
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return ItemMetadata(
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subject=headers.get("Subject"),
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sender=headers.get("From"),
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snippet=msg.get("snippet"),
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received_at=None,
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)
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return await asyncio.to_thread(_sync)
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# ── fetch_content ─────────────────────────────────────────────────────
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async def fetch_content(self, scout, ref: ItemRef) -> ItemContent:
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"""Fetch full body text via GmailClient — transient, must not be persisted."""
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creds_info = decrypt_token(scout.oauth_token_encrypted)
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client = GmailClient(creds_info)
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# fetch_messages returns EmailMessage dataclasses with body_text already
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# extracted and decoded. We pass an empty filter to avoid narrowing by
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# date — callers should only invoke fetch_content for known-new messages.
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messages = await client.fetch_messages(filter_config=None, since=None)
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# Pick the message matching our ref (or fall back to first if only one returned).
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email_msg = next(
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(m for m in messages if m.id == ref.source_msg_ref),
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messages[0] if messages else None,
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)
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if email_msg is None:
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raise ValueError(f"Message {ref.source_msg_ref!r} not found via GmailClient")
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return ItemContent(
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metadata=ItemMetadata(
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subject=email_msg.subject,
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sender=email_msg.sender,
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snippet=None,
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received_at=email_msg.date,
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),
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body_text=email_msg.body_text,
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raw_headers={},
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)
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# ── archive ───────────────────────────────────────────────────────────
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async def archive(self, scout, ref: ItemRef) -> None:
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"""Move the message to Gmail Trash (recoverable for 30 days)."""
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def _sync() -> None:
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service = _get_gmail_service(scout)
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service.users().messages().trash(
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userId="me", id=ref.source_msg_ref
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).execute()
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await asyncio.to_thread(_sync)
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# ── watch management ──────────────────────────────────────────────────
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async def setup_watch(self, scout) -> None:
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"""Register a Gmail Pub/Sub push watch for the INBOX label.
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Requires ``settings.GMAIL_PUBSUB_TOPIC`` to be set to the full topic
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resource name (e.g. ``projects/my-project/topics/gmail-push``).
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Logs a warning and returns without error if the topic is not configured.
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"""
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topic = settings.GMAIL_PUBSUB_TOPIC
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if not topic:
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logger.warning(
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"setup_watch: GMAIL_PUBSUB_TOPIC is not configured — skipping watch setup"
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)
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return
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def _sync() -> None:
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service = _get_gmail_service(scout)
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request_body = {
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"labelIds": ["INBOX"],
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"topicName": topic,
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}
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resp = service.users().watch(userId="me", body=request_body).execute()
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scout.gmail_history_id = resp.get("historyId")
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expiration_ms = resp.get("expiration")
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if expiration_ms:
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scout.gmail_watch_expires_at = datetime.fromtimestamp(
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int(expiration_ms) / 1000, tz=timezone.utc
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)
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await asyncio.to_thread(_sync)
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async def renew_watch(self, scout) -> None:
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"""Renew an existing Gmail Pub/Sub watch (same as setup_watch)."""
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await self.setup_watch(scout)
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