feat(triggers): add Vercel webhook triggers with automatic registration

[waleedlatif1]

Summary

• Add 8 Vercel webhook triggers: deployment created/ready/error/canceled, project created/removed, domain created, and generic webhook (all events)
• Automatic webhook registration via Vercel REST API (POST /v1/webhooks) with Bearer token auth
• Automatic cleanup on trigger removal (DELETE /v1/webhooks/{id})
• Supports optional team ID scoping and project ID filtering
• Webhook input formatting extracts deployment, project, team, user, target, plan, and domain from Vercel's envelope payload

Type of Change

• New feature

Testing

Tested manually

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

[cursor]

PR Summary

Medium Risk
Adds a new webhook provider with HMAC verification and automatic subscription creation/deletion via Vercel’s API; issues here could cause missed/extra webhook deliveries or leaked/misused credentials if misconfigured.

Overview
Adds Vercel webhook trigger support: registers 8 new Vercel triggers (deployment created/ready/error/canceled, project created/removed, domain created, and a generic vercel_webhook) in TRIGGER_REGISTRY and exposes them from the Vercel block via triggers.available and injected trigger subBlocks.

Introduces a new vercel webhook provider handler that auto-creates and deletes Vercel webhook subscriptions (scoped by optional teamId and projectIds filters), verifies incoming requests using x-vercel-signature HMAC, and normalizes incoming payloads into consistent trigger inputs.

^{Reviewed by Cursor Bugbot for commit ee040aa. Configure here.}

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Apr 6, 2026 7:20pm

[greptile-apps]

Greptile Summary

This PR adds 8 Vercel webhook triggers (deployment created/ready/error/canceled, project created/removed, domain created, and a generic all-events trigger) with automatic webhook lifecycle management — registration on trigger save and cleanup on trigger removal. The implementation closely follows established provider patterns from Ashby, Attio, and others: HMAC-SHA1 signature verification via createHmacVerifier, providerConfigUpdates for persisting externalId + webhookSecret, and formatInput to normalize Vercel's envelope payload into typed workflow inputs.

• Previously flagged critical issues (discarded webhookSecret, missing verifyAuth) have been properly resolved
• verifyAuth is correctly implemented using HMAC-SHA1 via the x-vercel-signature header and the createHmacVerifier factory
• createSubscription stores both externalId and webhookSecret in providerConfigUpdates
• deleteSubscription handles 404 gracefully (Vercel may have already cleaned up the webhook)
• formatInput extracts all relevant fields from Vercel's webhook envelope (deployment, project, team, user, target, plan, domain)
• All 8 triggers are registered in both triggers/registry.ts and lib/webhooks/providers/registry.ts; the Vercel block's triggers.available is updated accordingly
• Two minor P2 items remain: (1) webhookSecret falls back to '' rather than throwing when absent, silently bypassing HMAC auth; (2) the non-ok path in deleteSubscription doesn't consume the response body

Confidence Score: 5/5

Safe to merge — the integration is functionally complete, all prior critical issues are resolved, and remaining findings are minor defensive-coding suggestions

All remaining findings are P2. HMAC auth, auto-registration, and cleanup are correctly implemented following the codebase's established provider patterns. The empty-string secret fallback is the only item worth addressing before shipping but does not block merge.

apps/sim/lib/webhooks/providers/vercel.ts — the webhookSecret empty-string fallback on lines 150–155 and the unconsumed response body on lines 192–199 are the only items to address

Important Files Changed

Filename	Overview
apps/sim/lib/webhooks/providers/vercel.ts	Core Vercel webhook provider: HMAC-SHA1 verifyAuth, auto-registration via POST /v1/webhooks, cleanup via DELETE — webhookSecret falls back to empty string if absent from API response
apps/sim/lib/webhooks/providers/registry.ts	Registers vercelHandler in PROVIDER_HANDLERS map under the 'vercel' key
apps/sim/triggers/vercel/utils.ts	Shared Vercel trigger utilities: trigger options dropdown, setup instructions HTML, extra form fields (apiKey with user-only visibility, optional teamId and filterProjectIds), and typed output builders
apps/sim/triggers/vercel/webhook.ts	Generic Vercel webhook trigger subscribing to all supported event types
apps/sim/triggers/vercel/deployment_created.ts	Deployment Created trigger — primary trigger with dropdown for selecting event type
apps/sim/triggers/vercel/deployment_ready.ts	Deployment Ready trigger config using shared deployment outputs
apps/sim/triggers/vercel/deployment_error.ts	Deployment Error trigger config using shared deployment outputs
apps/sim/triggers/vercel/deployment_canceled.ts	Deployment Canceled trigger config using shared deployment outputs
apps/sim/triggers/vercel/project_created.ts	Project Created trigger config using shared project outputs
apps/sim/triggers/vercel/project_removed.ts	Project Removed trigger config using shared project outputs
apps/sim/triggers/vercel/domain_created.ts	Domain Created trigger config using shared domain outputs
apps/sim/triggers/vercel/index.ts	Barrel export for all 8 Vercel trigger configs
apps/sim/triggers/registry.ts	All 8 Vercel triggers correctly registered in TRIGGER_REGISTRY
apps/sim/blocks/blocks/vercel.ts	Vercel block updated to expose all 8 webhook triggers in triggers.available

Sequence Diagram

sequenceDiagram
    actor User
    participant Sim
    participant VercelAPI as Vercel API
    participant VercelEvents as Vercel Event System

    User->>Sim: Configure trigger (apiKey, teamId, projectIds)
    Sim->>VercelAPI: POST /v1/webhooks (events, url, projectIds)
    VercelAPI-->>Sim: { id: webhookId, secret: webhookSecret }
    Sim->>Sim: Store externalId + webhookSecret in providerConfig

    Note over Sim,VercelEvents: Later, when a Vercel event occurs...

    VercelEvents->>Sim: POST /webhook-url (event payload + x-vercel-signature)
    Sim->>Sim: Verify HMAC-SHA1 signature (webhookSecret + raw body)
    alt Signature invalid
        Sim-->>VercelEvents: 401 Unauthorized
    else Signature valid
        Sim->>Sim: Extract payload fields (deployment, project, team, domain...)
        Sim->>Sim: Execute workflow with formatted input
        Sim-->>VercelEvents: 200 OK
    end

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