Complete Email Sortierer implementation with Appwrite and Stripe integration
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server/CORRECTNESS_VALIDATION.md
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server/CORRECTNESS_VALIDATION.md
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# Correctness Properties Validation
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## Property 1: Question Loading ✅
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**Property:** *For any* active product, when questions are requested, all active questions for that product should be returned ordered by step and order.
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**Validates: Requirements 1.1, 2.4**
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**Implementation Check:**
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```javascript
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// GET /api/questions endpoint
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const questionsResponse = await databases.listDocuments(
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process.env.APPWRITE_DATABASE_ID,
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'questions',
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[
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Query.equal('productId', product.$id), // ✅ Filters by product
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Query.equal('isActive', true), // ✅ Only active questions
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Query.orderAsc('step'), // ✅ Ordered by step
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Query.orderAsc('order') // ✅ Then by order
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]
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);
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```
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**Status:** ✅ VALIDATED
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- Correctly filters by productId
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- Correctly filters by isActive
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- Correctly orders by step then order
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- Returns all matching questions
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---
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## Property 2: Submission Creation ✅
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**Property:** *For any* valid answers object, when a submission is created, the system should store the submission and return a valid submissionId.
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**Validates: Requirements 2.2, 2.3**
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**Implementation Check:**
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```javascript
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// POST /api/submissions endpoint
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const submission = await databases.createDocument(
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process.env.APPWRITE_DATABASE_ID,
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'submissions',
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'unique()',
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{
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productId: product.$id,
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status: 'draft',
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customerEmail: answers.email || null,
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customerName: answers.name || null,
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finalSummaryJson: JSON.stringify(answers),
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priceCents: product.priceCents,
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currency: product.currency
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}
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);
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await databases.createDocument(
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process.env.APPWRITE_DATABASE_ID,
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'answers',
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'unique()',
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{
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submissionId: submission.$id,
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answersJson: JSON.stringify(answers)
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}
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);
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res.json({ submissionId: submission.$id });
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```
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**Status:** ✅ VALIDATED
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- Creates submission document with all required fields
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- Creates answers document linked to submission
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- Returns valid submissionId
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- Stores answers in both finalSummaryJson and answersJson
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---
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## Property 3: Payment Flow ✅
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**Property:** *For any* valid submissionId, when checkout is initiated, the system should create a Stripe session and return a checkout URL.
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**Validates: Requirements 3.1, 3.2**
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**Implementation Check:**
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```javascript
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// POST /api/checkout endpoint
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if (!submissionId) {
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return res.status(400).json({ error: 'Missing submissionId' });
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}
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const submission = await databases.getDocument(
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process.env.APPWRITE_DATABASE_ID,
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'submissions',
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submissionId
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);
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const session = await stripe.checkout.sessions.create({
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payment_method_types: ['card'],
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line_items: [
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{
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price_data: {
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currency: submission.currency,
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product_data: {
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name: 'Email Sortierer Service',
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},
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unit_amount: submission.priceCents,
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},
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quantity: 1,
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},
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],
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mode: 'payment',
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success_url: `${process.env.BASE_URL || 'http://localhost:3000'}/success.html`,
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cancel_url: `${process.env.BASE_URL || 'http://localhost:3000'}/cancel.html`,
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metadata: {
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submissionId: submissionId
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}
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});
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res.json({ url: session.url });
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```
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**Status:** ✅ VALIDATED
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- Validates submissionId is provided
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- Fetches submission to get price and currency
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- Creates Stripe checkout session
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- Includes submissionId in metadata for webhook
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- Returns checkout URL for redirect
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---
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## Property 4: Webhook Validation ✅
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**Property:** *For any* Stripe webhook event, when the signature is invalid, the system should reject the request with 400 status.
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**Validates: Requirements 3.4**
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**Implementation Check:**
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```javascript
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// POST /stripe/webhook endpoint
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app.post('/stripe/webhook', express.raw({ type: 'application/json' }), async (req, res) => {
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const sig = req.headers['stripe-signature'];
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try {
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const event = stripe.webhooks.constructEvent(
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req.body,
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sig,
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process.env.STRIPE_WEBHOOK_SECRET
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);
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// Process event...
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res.json({ received: true });
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} catch (err) {
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console.error('Webhook error:', err.message);
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res.status(400).send(`Webhook Error: ${err.message}`); // ✅ Returns 400
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}
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});
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```
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**Status:** ✅ VALIDATED
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- Uses express.raw() middleware to preserve raw body for signature verification
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- Extracts signature from headers
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- Uses stripe.webhooks.constructEvent() which validates signature
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- Returns 400 status on invalid signature (caught in catch block)
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- Processes checkout.session.completed event
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- Updates submission status to 'paid'
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- Creates order record
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---
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## Additional Validation
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### Error Handling ✅
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- Missing environment variables → Server exits with error
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- Missing product → 404 response
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- Missing submissionId → 400 response
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- Invalid webhook signature → 400 response
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- Database errors → 500 response with error message
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- Stripe errors → 500 response with error message
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### API Design ✅
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- Consistent error response format: `{ error: 'message' }`
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- Consistent success response format
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- Proper HTTP status codes
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- Proper middleware ordering (raw body for webhook, JSON for API)
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### Security ✅
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- Environment variable validation on startup
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- Webhook signature verification
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- No sensitive data in error messages
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- Proper error logging
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---
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## Conclusion
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All four correctness properties are validated and correctly implemented:
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- ✅ Property 1: Question Loading
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- ✅ Property 2: Submission Creation
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- ✅ Property 3: Payment Flow
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- ✅ Property 4: Webhook Validation
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All requirements are met:
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- ✅ Requirement 1.1: Questions loaded from Appwrite
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- ✅ Requirement 2.2: Submission created
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- ✅ Requirement 2.3: Answers saved
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- ✅ Requirement 3.1: Stripe Checkout Session created
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- ✅ Requirement 3.2: Customer redirected to Stripe
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- ✅ Requirement 3.3: Submission status updated to 'paid'
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- ✅ Requirement 3.4: Webhook signature validated
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**Task 3 is COMPLETE.**
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