usrcp-gmail

Capture-only Gmail adapter for USRCP. Polls the configured user's Gmail for messages they sent and appends them to the local ledger as email_sent entries.

The cloud sees nothing from this adapter; ledger writes only. The ledger encrypts at rest under the same master key as the rest of USRCP.

What it captures

• Sent messages only. Mirrors the "what I did" framing of the Google Calendar adapter (#51): we record what the user wrote, not what landed in their inbox.
• Skipped: drafts, trash, spam.
• For each message: subject, body (text preferred, HTML stripped fallback), snippet, from / to / cc / bcc, Date header, label IDs, thread id, internalDate cursor.

Each ledger entry:

• domain: configurable (default email)
• intent: email_sent
• outcome: success
• detail: full message metadata (body capped at 48 KiB so the serialised detail stays under the ledger's 64 KiB envelope cap).
• tags: ["gmail", "email", "sent"]
• channel_id: Gmail threadId (so getRecentEventsByChannel returns the thread once we capture replies in a future PR).
• Idempotency key: gmail:message:<sha256(id)[:32]> (re-running the poller is a no-op; long imported-message IDs are handled).

Setup

Same OAuth posture as usrcp-google-calendar: Google has no "personal API key" shortcut for user mail data, so the wizard takes three secrets the user gets out-of-band.

1. Create the OAuth client (one-time)

1. console.cloud.google.com -> create / select a project.
2. APIs & Services > Library: enable Gmail API.
3. APIs & Services > OAuth consent screen: External, fill the required fields, add your email as a test user.
4. APIs & Services > Credentials > Create credentials > OAuth client ID: choose Desktop app. Copy the client ID and client secret.

2. Run the wizard

cd packages/usrcp-gmail
npm install
npm run build

usrcp setup --adapter=gmail

The wizard prompts for client_id + client_secret and then asks whether to authorise via browser (default Yes). The browser flow opens a localhost listener, prints the Google sign-in URL, captures the redirect, and persists the refresh token automatically; no copy / paste from the OAuth Playground.

If you can't open a browser from this machine (remote shell, CI, etc.), answer "no" and the wizard falls back to the manual OAuth-Playground path:

1. Visit developers.google.com/oauthplayground.
2. Click the gear icon, tick Use your own OAuth credentials, paste the client ID + secret.
3. In the left panel, scroll to Gmail API v1 and tick https://www.googleapis.com/auth/gmail.readonly.
4. Authorize APIs -> sign in -> Exchange authorization code for tokens.
5. Copy the refresh_token and paste it into the wizard.

The wizard validates the credentials against users.getProfile before persisting, so a bad value fails fast.

Run

usrcp-gmail
# or: USRCP_PASSPHRASE=<pp> usrcp-gmail

The poller logs each tick that captured or skipped any messages.

Config

Stored at ~/.usrcp/gmail-config.json (mode 0600):

| Field | Type | Notes | |---|---|---| | oauth_client_id | string | From step 1. Plaintext (not sensitive). | | oauth_client_secret | string | Encrypted at rest as enc:<base64> under the USRCP global key. | | refresh_token | string | Encrypted at rest as enc:<base64> under the USRCP global key. Reading disk without unlocking the master passphrase cannot recover the token. | | domain | string | USRCP domain to write events under. | | poll_interval_s | number | Seconds; 60-3600. Default 600 (10 min). | | last_synced_at | string | ISO; managed by the poller. |

Pre-#54 configs with plaintext secrets are still readable; the first save auto-migrates them into the encrypted envelope.

What's out of scope (v0)

• Received messages (replies, inbound mail). v0 captures only what the user authored.
• Thread reconstruction across messages. We tag each message with its thread_id so a follow-up PR can group them; v0 records each message independently.
• Attachment metadata or content.
• Push notifications via Gmail's watch endpoint (we poll - works behind NAT on a laptop, no public URL needed).
• Encrypting the refresh token under the USRCP master key (matches the Linear / Google Calendar posture: file is mode 0600 on the user's machine, same as ~/.ssh/id_rsa).
• Stream sync (no stream_events entries; ledger only).