webflow-security-basics

What this skill does

# Webflow Security Basics

## Overview

Security best practices for Webflow Data API v2 tokens, OAuth secrets, webhook
verification, and access control. Covers the full lifecycle from token creation
to rotation and revocation.

## Prerequisites

- Webflow developer account at `developers.webflow.com`
- Understanding of environment variables
- Secret management solution (vault, cloud secret manager, etc.)

## Instructions

### Step 1: Token Types and Selection

| Token Type | Scope | Best For |
|------------|-------|----------|
| **Workspace Token** | All sites in workspace | Internal tools, scripts |
| **Site Token** | Single site only | Single-site integrations |
| **OAuth Access Token** | User-authorized scopes | Public apps, marketplace apps |

**Rule: Never use a workspace token where a site token would suffice.**

### Step 2: Least Privilege Scopes

Only request scopes your integration actually needs:

| Operation | Minimum Scope |
|-----------|--------------|
| Read site info | `sites:read` |
| Publish site | `sites:write` |
| Read CMS content | `cms:read` |
| Create/update CMS items | `cms:write` |
| Read pages | `pages:read` |
| Read form submissions | `forms:read` |
| Read products/orders | `ecommerce:read` |
| Create products, fulfill orders | `ecommerce:write` |

```typescript
// Example: Read-only integration needs only these scopes
const READ_ONLY_SCOPES = "sites:read cms:read pages:read forms:read";

// CMS sync integration
const CMS_SYNC_SCOPES = "sites:read cms:read cms:write";

// Full ecommerce integration
const ECOMMERCE_SCOPES = "sites:read ecommerce:read ecommerce:write";
```

### Step 3: Secure Token Storage

```bash
# .gitignore — MANDATORY
.env
.env.local
.env.*.local
*.pem
*.key

# .env.local (never committed)
WEBFLOW_API_TOKEN=your-token-here
WEBFLOW_WEBHOOK_SECRET=your-webhook-secret
WEBFLOW_OAUTH_CLIENT_SECRET=your-oauth-secret
```

```typescript
// Load from environment, never hardcode
import { WebflowClient } from "webflow-api";

function createClient(): WebflowClient {
  const token = process.env.WEBFLOW_API_TOKEN;
  if (!token) {
    throw new Error(
      "WEBFLOW_API_TOKEN not set. " +
      "Generate at https://developers.webflow.com"
    );
  }
  return new WebflowClient({ accessToken: token });
}
```

### Step 4: Secret Rotation Procedure

```bash
# 1. Generate new token at developers.webflow.com
#    (old token remains valid until revoked)

# 2. Update secret in your deployment platform
# Vercel
vercel env rm WEBFLOW_API_TOKEN production
vercel env add WEBFLOW_API_TOKEN production

# Fly.io
fly secrets set WEBFLOW_API_TOKEN=new-token-here

# GCP Secret Manager
echo -n "new-token-here" | \
  gcloud secrets versions add webflow-api-token --data-file=-

# AWS Secrets Manager
aws secretsmanager update-secret \
  --secret-id webflow/api-token \
  --secret-string "new-token-here"

# 3. Verify new token works
curl -s -o /dev/null -w "%{http_code}" \
  -H "Authorization: Bearer $NEW_TOKEN" \
  https://api.webflow.com/v2/sites

# 4. Revoke old token in Webflow dashboard
# 5. Monitor for 401 errors in logs
```

### Step 5: Environment-Specific Keys

```typescript
// Use different tokens per environment
const TOKEN_MAP: Record<string, string> = {
  development: "WEBFLOW_API_TOKEN_DEV",
  staging: "WEBFLOW_API_TOKEN_STAGING",
  production: "WEBFLOW_API_TOKEN_PROD",
};

function getToken(): string {
  const env = process.env.NODE_ENV || "development";
  const envVar = TOKEN_MAP[env] || TOKEN_MAP.development;
  const token = process.env[envVar];

  if (!token) throw new Error(`${envVar} not set for ${env} environment`);
  return token;
}
```

### Step 6: Webhook Signature Verification

Webflow webhooks include a signature header for request verification:

```typescript
import crypto from "crypto";

function verifyWebhookSignature(
  rawBody: Buffer | string,
  signature: string,
  secret: string
): boolean {
  if (!signature || !secret) return false;

  const expectedSignature = crypto
    .createHmac("sha256", secret)
    .update(rawBody)
    .digest("hex");

  // Timing-safe comparison prevents timing attacks
  try {
    return crypto.timingSafeEqual(
      Buffer.from(signature),
      Buffer.from(expectedSignature)
    );
  } catch {
    return false; // Length mismatch
  }
}

// Express middleware
import express from "express";

app.post(
  "/webhooks/webflow",
  express.raw({ type: "application/json" }),
  (req, res) => {
    const signature = req.headers["x-webflow-signature"] as string;
    const secret = process.env.WEBFLOW_WEBHOOK_SECRET!;

    if (!verifyWebhookSignature(req.body, signature, secret)) {
      console.error("Webhook signature verification failed");
      return res.status(401).json({ error: "Invalid signature" });
    }

    const event = JSON.parse(req.body.toString());
    // Process verified event...
    res.status(200).json({ received: true });
  }
);
```

### Step 7: Audit Logging

```typescript
interface WebflowAuditEntry {
  timestamp: string;
  operation: string;
  method: string;
  endpoint: string;
  statusCode: number;
  tokenType: "workspace" | "site" | "oauth";
  environment: string;
  durationMs: number;
}

function logApiCall(entry: WebflowAuditEntry): void {
  // Structured JSON log — ship to your logging platform
  console.log(JSON.stringify({
    level: entry.statusCode >= 400 ? "error" : "info",
    service: "webflow-integration",
    ...entry,
  }));
}
```

## Security Checklist

- [ ] API tokens stored in environment variables, never in code
- [ ] `.env` files in `.gitignore`
- [ ] Different tokens for dev/staging/production
- [ ] Minimal scopes per token (least privilege)
- [ ] Webhook signatures verified on every request
- [ ] Timing-safe comparison for signature checks
- [ ] Token rotation procedure documented and tested
- [ ] Audit logging enabled for all API calls
- [ ] No tokens in client-side code (tokens are server-side only)
- [ ] Git history scanned for accidentally committed tokens

## Output

- Secure token storage with environment isolation
- Least privilege scope selection
- Webhook signature verification
- Token rotation procedure
- Audit logging for compliance

## Error Handling

| Security Issue | Detection | Mitigation |
|---------------|-----------|------------|
| Token in git history | `git log -p \| grep WEBFLOW` | Revoke token immediately, rotate |
| Excessive scopes | Review at developers.webflow.com | Generate new token with minimal scopes |
| Missing webhook verification | No signature check in code | Add `verifyWebhookSignature()` |
| Token never rotated | No rotation log | Schedule quarterly rotation |

## Resources

- [Webflow Authentication](https://developers.webflow.com/data/reference/authentication)
- [Webflow Scopes](https://developers.webflow.com/data/reference/scopes)
- [OAuth Reference](https://developers.webflow.com/data/reference/oauth-app)

## Next Steps

For production deployment, see `webflow-prod-checklist`.