feat: server-side validation + input sanitization (v0.4.5)

README.md

@@ -119,7 +119,7 @@ Version numbers correlate directly to the active phase:
   - ~~Contact and support forms fully wired to Express~~ ✅
   - ~~SQLite persistence verified~~ ✅
   - ~~Client-side validation + Sonner feedback~~ ✅
-  - Server-side validation + input sanitization
+  - ~~Server-side validation + input sanitization~~ ✅
   - Optional Zoho forwarding layer
   - Backend/API hardening as needed
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "queuenorth-website",
   "private": true,
-  "version": "0.4.4",
+  "version": "0.4.5",
   "type": "module",
   "scripts": {
     "dev": "concurrently \"vite\" \"node server/index.js\"",

server/index.js

@@ -20,8 +20,8 @@ if (!existsSync(dbDir)) {
 }
 
 // Middleware
-app.use(express.json())
+app.use(express.json({ limit: '1mb' }))
-app.use(express.urlencoded({ extended: true }))
+app.use(express.urlencoded({ extended: true, limit: '1mb' }))
 app.use(express.static(path.join(__dirname, '../dist')))
 
 // --- Database ---
@@ -61,24 +61,48 @@ const initSchema = () => {
 
 initSchema()
 
+// --- Sanitization Helper ---
+const sanitizeString = (input, maxLength) => {
+  if (typeof input !== 'string') return input
+  // Trim whitespace
+  let sanitized = input.trim()
+  // Remove HTML/script tags to prevent XSS
+  sanitized = sanitized.replace(/<script[^>]*>.*?<\/script>/gi, '')
+  sanitized = sanitized.replace(/<[^>]*>/g, '')
+  // Truncate to max length
+  return sanitized.substring(0, maxLength)
+}
+
+const sanitizePayload = (data, fields) => {
+  const result = { ...data }
+  for (const [field, maxLength] of Object.entries(fields)) {
+    if (result[field] !== undefined) {
+      result[field] = sanitizeString(result[field], maxLength)
+    }
+  }
+  return result
+}
+
 // --- Validation Schemas ---
 const leadSchema = z.object({
-  company: z.string().min(1, 'Company name is required'),
+  company: z.string().min(1, 'Company name is required').trim().max(200, 'Company name must be 200 characters or less'),
-  name: z.string().min(1, 'Name is required'),
+  name: z.string().min(1, 'Name is required').trim().max(100, 'Name must be 100 characters or less'),
-  email: z.string().email('Valid email is required'),
+  email: z.string().email('Valid email is required').trim().max(254, 'Email must be 254 characters or less'),
-  phone: z.string().optional(),
+  phone: z.string().trim().max(50, 'Phone must be 50 characters or less').optional().or(z.literal('').transform(() => undefined)),
-  zip: z.string().optional(),
+  zip: z.string().trim().max(10, 'ZIP code must be 10 characters or less').optional().or(z.literal('').transform(() => undefined)),
-  message: z.string().optional(),
+  message: z.string().trim().max(5000, 'Message must be 5000 characters or less').optional().or(z.literal('').transform(() => undefined)),
-  service_interest: z.string().optional(),
+  service_interest: z.string().trim().max(50, 'Service interest must be 50 characters or less').optional().or(z.literal('').transform(() => undefined)),
 })
 
 const supportSchema = z.object({
-  name: z.string().min(1, 'Name is required'),
+  name: z.string().min(1, 'Name is required').trim().max(100, 'Name must be 100 characters or less'),
-  company: z.string().min(1, 'Company name is required'),
+  company: z.string().min(1, 'Company name is required').trim().max(200, 'Company name must be 200 characters or less'),
-  email: z.string().email('Valid email is required'),
+  email: z.string().email('Valid email is required').trim().max(254, 'Email must be 254 characters or less'),
-  phone: z.string().optional(),
+  phone: z.string().trim().max(50, 'Phone must be 50 characters or less').optional().or(z.literal('').transform(() => undefined)),
-  issue: z.string().min(10, 'Please provide more details about your issue'),
+  issue: z.string().min(10, 'Please provide at least 10 characters describing your issue').trim().max(5000, 'Issue description must be 5000 characters or less'),
-  priority: z.enum(['low', 'medium', 'high']).optional(),
+  priority: z.enum(['low', 'medium', 'high'], {
+    errorMap: () => ({ message: 'Priority must be low, medium, or high' }),
+  }).transform((val) => val?.toLowerCase() ?? undefined).optional().or(z.literal('').transform(() => undefined)),
 })
 
 // --- API Routes ---
@@ -94,25 +118,42 @@ app.post('/api/leads', (req, res) => {
     const parsed = leadSchema.safeParse(req.body)
     
     if (!parsed.success) {
+      const fieldErrors = {}
+      for (const issue of parsed.error.issues) {
+        if (issue.path[0]) {
+          fieldErrors[issue.path[0]] = issue.message
+        }
+      }
       return res.status(400).json({
         error: 'Validation failed',
-        details: parsed.error.format(),
+        fields: fieldErrors,
       })
     }
 
+    // Sanitize parsed data before insert (trim, strip tags, truncate)
+    const sanitized = sanitizePayload(parsed.data, {
+      company: 200,
+      name: 100,
+      email: 254,
+      phone: 50,
+      zip: 10,
+      message: 5000,
+      service_interest: 50,
+    })
+
     const stmt = db.prepare(`
       INSERT INTO leads (company, name, email, phone, zip, message, service_interest)
       VALUES (?, ?, ?, ?, ?, ?, ?)
     `)
 
     stmt.run(
-      parsed.data.company,
+      sanitized.company,
-      parsed.data.name,
+      sanitized.name,
-      parsed.data.email,
+      sanitized.email,
-      parsed.data.phone || null,
+      sanitized.phone || null,
-      parsed.data.zip || null,
+      sanitized.zip || null,
-      parsed.data.message || null,
+      sanitized.message || null,
-      parsed.data.service_interest || null
+      sanitized.service_interest || null
     )
 
     res.json({ success: true, message: 'Thanks! We\'ll be in touch shortly.' })
@@ -128,24 +169,40 @@ app.post('/api/support', (req, res) => {
     const parsed = supportSchema.safeParse(req.body)
     
     if (!parsed.success) {
+      const fieldErrors = {}
+      for (const issue of parsed.error.issues) {
+        if (issue.path[0]) {
+          fieldErrors[issue.path[0]] = issue.message
+        }
+      }
       return res.status(400).json({
         error: 'Validation failed',
-        details: parsed.error.format(),
+        fields: fieldErrors,
       })
     }
 
+    // Sanitize parsed data before insert (trim, strip tags, truncate)
+    const sanitized = sanitizePayload(parsed.data, {
+      name: 100,
+      company: 200,
+      email: 254,
+      phone: 50,
+      issue: 5000,
+      priority: 10,
+    })
+
     const stmt = db.prepare(`
       INSERT INTO support_requests (name, company, email, phone, issue, priority)
       VALUES (?, ?, ?, ?, ?, ?)
     `)
 
     stmt.run(
-      parsed.data.name,
+      sanitized.name,
-      parsed.data.company,
+      sanitized.company,
-      parsed.data.email,
+      sanitized.email,
-      parsed.data.phone || null,
+      sanitized.phone || null,
-      parsed.data.issue,
+      sanitized.issue,
-      parsed.data.priority || 'medium'
+      sanitized.priority || 'medium'
     )
 
     res.json({ success: true, message: 'Thanks! We\'ll get back to you soon.' })