Validate Trigger

Validate Trigger

You are an expert auditor for Sim webhook triggers. Your job is to validate that an existing trigger implementation is correct, complete, secure, and aligned across all layers.

Your Task

1. Read the service's webhook/API documentation (via WebFetch)
2. Read every trigger file, provider handler, and registry entry
3. Cross-reference against the API docs and Sim conventions
4. Report all issues grouped by severity (critical, warning, suggestion)
5. Fix all issues after reporting them

Step 1: Gather All Files

Read every file for the trigger — do not skip any:

apps/sim/triggers/{service}/           # All trigger files, utils.ts, index.ts
apps/sim/lib/webhooks/providers/{service}.ts  # Provider handler (if exists)
apps/sim/lib/webhooks/providers/registry.ts   # Handler registry
apps/sim/triggers/registry.ts                 # Trigger registry
apps/sim/blocks/blocks/{service}.ts           # Block definition (trigger wiring)

Also read for reference:

apps/sim/lib/webhooks/providers/types.ts            # WebhookProviderHandler interface
apps/sim/lib/webhooks/providers/utils.ts            # Shared helpers (createHmacVerifier, etc.)
apps/sim/lib/webhooks/provider-subscription-utils.ts    # Subscription helpers
apps/sim/lib/webhooks/processor.ts                  # Central webhook processor

Step 2: Pull API Documentation

Fetch the service's official webhook documentation. This is the source of truth for:

• Webhook event types and payload shapes
• Signature/auth verification method (HMAC algorithm, header names, secret format)
• Challenge/verification handshake requirements
• Webhook subscription API (create/delete endpoints, if applicable)
• Retry behavior and delivery guarantees

Hard Rule: No Guessed Webhook Payload Schemas

If the official docs do not clearly show the webhook payload JSON for an event, you MUST tell the user instead of guessing.

• Do NOT invent payload field names
• Do NOT infer nested payload paths without evidence
• Do NOT treat likely event shapes as verified
• Do NOT accept formatInput mappings that are not backed by docs or live payloads

If a payload schema is unknown, validation must explicitly recommend:

1. sample webhook payloads,
2. a live test webhook source, or
3. trimming the trigger to only documented outputs.

Step 3: Validate Trigger Definitions

utils.ts

• {service}TriggerOptions lists all trigger IDs accurately
• {service}SetupInstructions provides clear, correct steps for the service
• build{Service}ExtraFields includes relevant filter/config fields with correct condition
• Output builders expose all meaningful fields from the webhook payload
• Output builders do NOT use optional: true or items (tool-output-only features)
• Nested output objects correctly model the payload structure

Trigger Files

• Exactly one primary trigger has includeDropdown: true
• All secondary triggers do NOT have includeDropdown
• All triggers use buildTriggerSubBlocks helper (not hand-rolled subBlocks)
• Every trigger's id matches the convention {service}_{event_name}
• Every trigger's provider matches the service name used in the handler registry
• index.ts barrel exports all triggers

Trigger ↔ Provider Alignment (CRITICAL)

• Every trigger ID referenced in matchEvent logic exists in {service}TriggerOptions
• Event matching logic in the provider correctly maps trigger IDs to service event types
• Event matching logic in is{Service}EventMatch (if exists) correctly identifies events per the API docs

Step 4: Validate Provider Handler

Auth Verification

• verifyAuth correctly validates webhook signatures per the service's documentation
• HMAC algorithm matches (SHA-1, SHA-256, SHA-512)
• Signature header name matches the API docs exactly
• Signature format is handled (raw hex, sha256= prefix, base64, etc.)
• Uses safeCompare for timing-safe comparison (no ===)
• If webhookSecret is required, handler rejects when it's missing (fail-closed)
• Signature is computed over raw body (not parsed JSON)

Event Matching

• matchEvent returns boolean (not NextResponse or other values)
• Challenge/verification events are excluded from matching (e.g., endpoint.url_validation)
• When triggerId is a generic webhook ID, all events pass through
• When triggerId is specific, only matching events pass
• Event matching logic uses dynamic await import() for trigger utils (avoids circular deps)

formatInput (CRITICAL)

• Every key in the formatInput return matches a key in the trigger outputs schema
• Every key in the trigger outputs schema is populated by formatInput
• No extra undeclared keys that users can't discover in the UI
• No wrapper objects (webhook: { ... }, {service}: { ... })
• Nested output paths exist at the correct depth (e.g., resource.id actually has resource: { id: ... })
• null is used for missing optional fields (not empty strings or empty objects)
• Returns { input: { ... } } — not a bare object
• Every mapped payload field is backed by official docs or live-verified webhook payloads

Idempotency

• extractIdempotencyId returns a stable, unique key per delivery
• Uses provider-specific delivery IDs when available (e.g., X-Request-Id, Linear-Delivery, svix-id)
• Falls back to content-based ID (e.g., ${type}:${id}) when no delivery header exists
• Does NOT include timestamps in the idempotency key (would break dedup on retries)

Challenge Handling (if applicable)

• handleChallenge correctly implements the service's URL verification handshake
• Returns the expected response format per the API docs
• Env-backed secrets are resolved via resolveEnvVarsInObject if needed

Step 5: Validate Automatic Subscription Lifecycle

If the service supports programmatic webhook creation:

createSubscription

• Calls the correct API endpoint to create a webhook
• Sends the correct event types/filters
• Passes the notification URL from getNotificationUrl(ctx.webhook)
• Returns { providerConfigUpdates: { externalId } } with the external webhook ID
• Throws on failure (orchestration handles rollback)
• Provides user-friendly error messages (401 → "Invalid API Key", etc.)

deleteSubscription

• Calls the correct API endpoint to delete the webhook
• Handles 404 gracefully (webhook already deleted)
• Never throws — catches errors and logs non-fatally
• Skips gracefully when apiKey or externalId is missing

Orchestration Isolation

• NO provider-specific logic in route.ts, provider-subscriptions.ts, or deploy.ts
• All subscription logic lives on the handler (createSubscription/deleteSubscription)

Step 6: Validate Registration and Block Wiring

Trigger Registry (triggers/registry.ts)

• All triggers are imported and registered
• Registry keys match trigger IDs exactly
• No orphaned entries (triggers that don't exist)

Provider Handler Registry (providers/registry.ts)

• Handler is imported and registered (if handler exists)
• Registry key matches the provider field on the trigger configs
• Entries are in alphabetical order

Block Wiring (blocks/blocks/{service}.ts)

• Block has triggers.enabled: true
• triggers.available lists all trigger IDs
• All trigger subBlocks are spread into subBlocks: ...getTrigger('id').subBlocks
• No trigger IDs in triggers.available that aren't in the registry
• No trigger subBlocks spread that aren't in triggers.available

Step 7: Validate Security

• Webhook secrets are never logged (not even at debug level)
• Auth verification runs before any event processing
• No secret comparison uses === (must use safeCompare or crypto.timingSafeEqual)
• Timestamp/replay protection is reasonable (not too tight for retries, not too loose for security)
• Raw body is used for signature verification (not re-serialized JSON)

Step 8: Report and Fix

Report Format

Group findings by severity:

Critical (runtime errors, security issues, or data loss):

• Wrong HMAC algorithm or header name
• formatInput keys don't match trigger outputs
• Missing verifyAuth when the service sends signed webhooks
• matchEvent returns non-boolean values
• Provider-specific logic leaking into shared orchestration files
• Trigger IDs mismatch between trigger files, registry, and block
• createSubscription calling wrong API endpoint
• Auth comparison using === instead of safeCompare

Warning (convention violations or usability issues):

• Missing extractIdempotencyId when the service provides delivery IDs
• Timestamps in idempotency keys (breaks dedup on retries)
• Missing challenge handling when the service requires URL verification
• Output schema missing fields that formatInput returns (undiscoverable data)
• Overly tight timestamp skew window that rejects legitimate retries
• matchEvent not filtering challenge/verification events
• Setup instructions missing important steps

Suggestion (minor improvements):

• More specific output field descriptions
• Additional output fields that could be exposed
• Better error messages in createSubscription
• Logging improvements

Fix All Issues

After reporting, fix every critical and warning issue. Apply suggestions where they don't add unnecessary complexity.

Validation Output

After fixing, confirm:

1. bun run type-check passes
2. Re-read all modified files to verify fixes are correct
3. Provider handler tests pass (if they exist): bun test {service}
4. Any remaining unknown webhook payload schemas were explicitly reported to the user instead of guessed

Checklist Summary

• Read all trigger files, provider handler, types, registries, and block
• Pulled and read official webhook/API documentation
• Validated trigger definitions: options, instructions, extra fields, outputs
• Validated primary/secondary trigger distinction (includeDropdown)
• Validated provider handler: auth, matchEvent, formatInput, idempotency
• Validated output alignment: every outputs key ↔ every formatInput key
• Validated subscription lifecycle: createSubscription, deleteSubscription, no shared-file edits
• Validated registration: trigger registry, handler registry, block wiring
• Validated security: safe comparison, no secret logging, replay protection
• Reported all issues grouped by severity
• Fixed all critical and warning issues
• bun run type-check passes after fixes