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90 lines
4.0 KiB
TypeScript
90 lines
4.0 KiB
TypeScript
import { writeAudit } from './audit'
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import { decrypt } from './crypto'
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import type { DB } from './db'
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import { getAccessToken, TokenDeadError, type GmailDeps } from './gmail'
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import { getDocument } from './repos-documents'
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import { getAccount, markAccountDead } from './repos-email'
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import { getSetting, setSetting, upsertReminder } from './repos-reminders'
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/**
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* Bounce detection — "sent" ≠ "delivered" (spec §3). Polls the mailbox (Gmail
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* readonly) for mailer-daemon/postmaster DSNs since the last poll, matches failed
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* recipients against email_log, flips them to bounced and raises a dashboard
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* reminder. fetch is injected so tests run offline. Idempotent: a row only flips
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* once (bounced=0 guard) and the reminder keys on the email_log id.
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*/
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const GMAIL_LIST = 'https://gmail.googleapis.com/gmail/v1/users/me/messages'
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const EMAIL_RE = /[\w.+-]+@[\w-]+\.[\w.-]+/g
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export interface BounceDeps { gmail: GmailDeps; now?: () => string }
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interface GmailMessageMeta { snippet?: string; payload?: { headers?: { name: string; value: string }[] } }
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function extractRecipients(msg: GmailMessageMeta): string[] {
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const out = new Set<string>()
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for (const h of msg.payload?.headers ?? []) {
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if (h.name.toLowerCase() === 'x-failed-recipients') {
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for (const a of h.value.split(',')) { const t = a.trim(); if (t !== '') out.add(t.toLowerCase()) }
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}
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}
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for (const m of (msg.snippet ?? '').matchAll(EMAIL_RE)) out.add(m[0].toLowerCase())
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return [...out]
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}
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/** Flip the most recent matching sent log to bounced + raise an email_bounced reminder. */
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export function markBounce(db: DB, recipient: string, at: string): number {
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const row = db.prepare(
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`SELECT id, document_id FROM email_log
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WHERE lower(to_addr)=lower(?) AND status='sent' AND bounced=0
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ORDER BY id DESC LIMIT 1`,
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).get(recipient) as { id: string; document_id: string | null } | undefined
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if (row === undefined) return 0
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db.prepare(`UPDATE email_log SET bounced=1 WHERE id=?`).run(row.id)
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const clientId = row.document_id !== null ? (getDocument(db, row.document_id)?.clientId ?? '') : ''
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upsertReminder(db, {
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ruleKind: 'email_bounced', subjectId: row.id, duePeriod: row.id, clientId,
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docId: row.document_id, now: at,
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})
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writeAudit(db, 'system', 'update', 'email_log', row.id, { bounced: 0 }, { bounced: 1, recipient })
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return 1
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}
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export async function pollBounces(db: DB, deps: BounceDeps): Promise<{ scanned: number; bounced: number }> {
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const now = deps.now?.() ?? new Date().toISOString()
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const account = getAccount(db)
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if (account === null || account.status === 'dead') return { scanned: 0, bounced: 0 }
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let accessToken: string
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try {
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accessToken = await getAccessToken(
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decrypt(account.refreshTokenEnc, deps.gmail.keyHex), deps.gmail.clientId, deps.gmail.clientSecret, deps.gmail.f,
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)
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} catch (err) {
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if (err instanceof TokenDeadError) markAccountDead(db)
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return { scanned: 0, bounced: 0 }
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}
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const since = getSetting(db, 'reminders.bounce_last_poll')
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?? new Date(Date.parse(now) - 2 * 86_400_000).toISOString()
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const q = `from:mailer-daemon OR from:postmaster after:${Math.floor(Date.parse(since) / 1000)}`
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const headers = { authorization: `Bearer ${accessToken}` }
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let scanned = 0
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let bounced = 0
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try {
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const list = await deps.gmail.f(`${GMAIL_LIST}?q=${encodeURIComponent(q)}`, { headers })
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const listJson = await list.json().catch(() => ({})) as { messages?: { id: string }[] }
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for (const { id } of listJson.messages ?? []) {
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scanned += 1
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const msg = await deps.gmail.f(
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`${GMAIL_LIST}/${id}?format=metadata&metadataHeaders=Subject&metadataHeaders=X-Failed-Recipients`, { headers },
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)
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const meta = await msg.json().catch(() => ({})) as GmailMessageMeta
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for (const recipient of extractRecipients(meta)) bounced += markBounce(db, recipient, now)
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}
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} catch {
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// Network hiccup: leave bounce_last_poll unchanged so the next pass re-scans this window.
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return { scanned, bounced }
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}
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setSetting(db, 'system', 'reminders.bounce_last_poll', now)
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return { scanned, bounced }
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}
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