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feat: add github app webhook ingress with signature verification
Daniel Roe
(May 4, 2026, 12:52 PM +0200)
b617e923
afd7d2a0
+153
+3
nuxt.config.ts
+3
nuxt.config.ts
+2
package.json
+2
package.json
···
36
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"@nuxt/image": "^2.0.0",
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"@nuxt/scripts": "^1.0.6",
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"@nuxtjs/html-validator": "^2.1.0",
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+
"@octokit/webhooks-methods": "^6.0.0",
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"drizzle-orm": "^0.45.2",
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"nuxt": "^4.4.4",
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"nuxt-og-image": "^6.4.11",
···
46
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},
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"devDependencies": {
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"@nuxt/test-utils": "4.0.3",
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+
"@octokit/webhooks-types": "^7.6.1",
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"@playwright/test": "1.59.1",
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"@stylistic/eslint-plugin": "^5.10.0",
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"@vitest/coverage-v8": "^4.1.5",
+17
pnpm-lock.yaml
+17
pnpm-lock.yaml
···
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'@nuxtjs/html-validator':
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specifier: ^2.1.0
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version: 2.1.0(@voidzero-dev/vite-plus-test@0.1.20)(magicast@0.5.2)
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'@octokit/webhooks-methods':
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specifier: ^6.0.0
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version: 6.0.0
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drizzle-orm:
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specifier: ^0.45.2
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version: 0.45.2(@neondatabase/serverless@1.1.0)
···
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'@nuxt/test-utils':
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specifier: 4.0.3
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version: 4.0.3(@playwright/test@1.59.1)(@voidzero-dev/vite-plus-test@0.1.20)(@vue/test-utils@2.4.10(@vue/compiler-dom@3.5.33)(@vue/server-renderer@3.5.33(vue@3.5.33(typescript@6.0.3)))(vue@3.5.33(typescript@6.0.3)))(crossws@0.4.5(srvx@0.11.15))(happy-dom@20.9.0)(magicast@0.5.2)(playwright-core@1.59.1)(typescript@6.0.3)(vite@7.3.2(@types/node@25.6.0)(jiti@2.6.1)(lightningcss@1.32.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.8.4))
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'@octokit/webhooks-types':
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specifier: ^7.6.1
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version: 7.6.1
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'@playwright/test':
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specifier: 1.59.1
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version: 1.59.1
···
1326
1332
1327
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'@nuxtjs/html-validator@2.1.0':
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resolution: {integrity: sha512-ldo8ioSsH3OEumtgwDMokTxlhjgO9FxjJWViAxisq5l/wjvaVX8SYTQ02wjtQcQQPSvS6BwgypAp400RlyFHng==}
1335
+
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+
'@octokit/webhooks-methods@6.0.0':
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resolution: {integrity: sha512-MFlzzoDJVw/GcbfzVC1RLR36QqkTLUf79vLVO3D+xn7r0QgxnFoLZgtrzxiQErAjFUOdH6fas2KeQJ1yr/qaXQ==}
1338
+
engines: {node: '>= 20'}
1339
+
1340
+
'@octokit/webhooks-types@7.6.1':
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+
resolution: {integrity: sha512-S8u2cJzklBC0FgTwWVLaM8tMrDuDMVE4xiTK4EYXM9GntyvrdbSoxqDQa+Fh57CCNApyIpyeqPhhFEmHPfrXgw==}
1329
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'@one-ini/wasm@0.1.1':
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resolution: {integrity: sha512-XuySG1E38YScSJoMlqovLru4KTUNSjgVTIjyh7qMX6aNN5HY5Ct5LhRJdxO79JtTzKfzV/bnWpz+zquYrISsvw==}
···
6919
6932
- jest-snapshot
6920
6933
- magicast
6921
6934
- vitest
6935
+
6936
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'@octokit/webhooks-methods@6.0.0': {}
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+
6938
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'@octokit/webhooks-types@7.6.1': {}
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'@one-ini/wasm@0.1.1': {}
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+104
server/api/github/webhook.post.ts
+104
server/api/github/webhook.post.ts
···
1
+
import type { InstallationEvent } from '@octokit/webhooks-types'
2
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import { verify } from '@octokit/webhooks-methods'
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import { sql } from 'drizzle-orm'
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import { installation, webhookEvent } from '~~/server/db/schema'
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+
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const RECOGNISED_EVENTS = new Set([
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'push',
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'create',
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'delete',
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'repository',
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'installation',
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'installation_repositories',
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])
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+
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export default defineEventHandler(async event => {
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const { githubWebhookSecret } = useRuntimeConfig()
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if (!githubWebhookSecret) {
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throw createError({ statusCode: 500, statusMessage: 'webhook secret not configured' })
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}
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+
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const signature = getRequestHeader(event, 'x-hub-signature-256')
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const deliveryHeader = getRequestHeader(event, 'x-github-delivery')
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const eventName = getRequestHeader(event, 'x-github-event')
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+
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if (!signature || !deliveryHeader || !eventName) {
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throw createError({ statusCode: 400, statusMessage: 'missing required headers' })
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}
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+
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const rawBody = await readRawBody(event, 'utf8')
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if (!rawBody) {
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throw createError({ statusCode: 400, statusMessage: 'empty body' })
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}
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const valid = await verify(githubWebhookSecret, rawBody, signature)
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if (!valid) {
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throw createError({ statusCode: 401, statusMessage: 'invalid signature' })
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}
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+
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const deliveryId = deliveryHeader.toLowerCase()
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// Idempotent insert. If this delivery has already been seen, the row is not
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// re-inserted and `inserted` is empty; we 200 and skip downstream work.
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const db = useDb()
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const inserted = await db
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.insert(webhookEvent)
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.values({
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deliveryId,
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source: 'github',
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event: eventName,
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})
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.onConflictDoNothing({ target: webhookEvent.deliveryId })
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.returning({ deliveryId: webhookEvent.deliveryId })
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+
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if (inserted.length === 0) {
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return { ok: true, duplicate: true }
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}
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+
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// Bookkeeping for installation lifecycle events. Sync work itself is enqueued
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// by later commits; for now we just keep the `installation` table in step so
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// those commits can FK-reference rows that already exist.
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if (eventName === 'installation') {
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const body = await readBody<InstallationEvent>(event)
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const action = body.action
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if (action === 'created') {
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const account = body.installation.account
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// GitHub's `installation.account` is `User | Enterprise | null`, but the
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// ones we accept are user/org accounts; bail loudly on anything else.
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if (!account || !('login' in account) || !('type' in account)) {
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throw createError({ statusCode: 400, statusMessage: 'unsupported installation account' })
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}
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const accountType = account.type === 'Organization' ? 'Organization' : 'User'
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await db.insert(installation).values({
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id: body.installation.id,
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accountLogin: account.login,
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accountId: account.id,
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accountType,
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}).onConflictDoNothing({ target: installation.id })
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}
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else if (action === 'deleted') {
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// installation row deletion cascades to user_identity, ssh_key, repo_mapping.
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// The corresponding sh.tangled.publicKey record on the user's PDS is revoked
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// in commit 15.
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await db.delete(installation).where(sql`${installation.id} = ${body.installation.id}`)
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}
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else if (action === 'suspend') {
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await db.update(installation)
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.set({ suspendedAt: new Date() })
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.where(sql`${installation.id} = ${body.installation.id}`)
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}
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else if (action === 'unsuspend') {
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await db.update(installation)
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.set({ suspendedAt: null })
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.where(sql`${installation.id} = ${body.installation.id}`)
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}
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}
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+
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// TODO(commit 7): enqueue a job for recognised event types.
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if (RECOGNISED_EVENTS.has(eventName)) {
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// Will become: await enqueue({ kind: eventName, payload: <envelope> })
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}
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return { ok: true, deliveryId }
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+
})
+27
test/unit/github-webhook.spec.ts
+27
test/unit/github-webhook.spec.ts
···
1
+
import { sign, verify } from '@octokit/webhooks-methods'
2
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import { describe, expect, it } from 'vitest'
3
+
4
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describe('github webhook signature verification', () => {
5
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const secret = 'test-webhook-secret'
6
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const payload = JSON.stringify({ action: 'created', installation: { id: 1 } })
7
+
8
+
it('accepts a valid signature', async () => {
9
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const signature = await sign(secret, payload)
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expect(await verify(secret, payload, signature)).toBe(true)
11
+
})
12
+
13
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it('rejects a tampered payload', async () => {
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const signature = await sign(secret, payload)
15
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const tampered = payload.replace('"created"', '"deleted"')
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expect(await verify(secret, tampered, signature)).toBe(false)
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})
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+
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it('rejects a wrong secret', async () => {
20
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const signature = await sign(secret, payload)
21
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expect(await verify('not-the-secret', payload, signature)).toBe(false)
22
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})
23
+
24
+
it('rejects a malformed signature', async () => {
25
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expect(await verify(secret, payload, 'sha256=garbage')).toBe(false)
26
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})
27
+
})