feat(landing): Add newsletter double-opt-in

landing/server/api/newsletter/subscribe.post.ts

@@ -29,29 +29,71 @@ export default defineEventHandler(async (event) => {
     })
   }
 
+  // Check if DOI template ID is configured
+  if (!config.brevoDoiTemplateId) {
+    console.error('BREVO_DOI_TEMPLATE_ID is not configured')
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Newsletter service is not configured'
+    })
+  }
+
+  console.log('DOI_TEMPLATE_ID', config.brevoDoiTemplateId)
+
+  // Check if public site URL is configured (for DOI redirect)
+  if (!config.public.siteUrl) {
+    console.error('NUXT_PUBLIC_SITE_URL is not configured')
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Newsletter service is not configured'
+    })
+  }
+
+  // Check if newsletter list ID is configured
+  if (!config.brevoNewsletterListId) {
+    console.error('BREVO_NEWSLETTER_LIST_ID is not configured')
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Newsletter service is not configured'
+    })
+  }
+
+  const templateId = parseInt(config.brevoDoiTemplateId, 10)
+  if (isNaN(templateId)) {
+    console.error('BREVO_DOI_TEMPLATE_ID is not a valid number')
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Newsletter service is not configured'
+    })
+  }
+
+  const listId = parseInt(config.brevoNewsletterListId, 10)
+  if (isNaN(listId)) {
+    console.error('BREVO_NEWSLETTER_LIST_ID is not a valid number')
+    throw createError({
+      statusCode: 500,
+      statusMessage: 'Newsletter service is not configured'
+    })
+  }
+
+  // Build the redirection URL to the confirmation page
+  const redirectionUrl = `${config.public.siteUrl}/newsletter-bestaetigt`
+
   try {
-    // Build request body for Brevo Contacts API
-    const brevoBody: {
-      email: string
-      updateEnabled: boolean
-      listIds?: number[]
-    } = {
+    // Build request body for Brevo Double Opt-In API
+    const brevoBody = {
       email,
-      updateEnabled: true
+      templateId,
+      redirectionUrl,
+      includeListIds: [listId]
     }
 
-    // Add list ID if configured
-    if (config.brevoNewsletterListId) {
-      const listId = parseInt(config.brevoNewsletterListId, 10)
-      if (!isNaN(listId)) {
-        brevoBody.listIds = [listId]
-      }
-    }
+    console.log('Brevo DOI request body:', brevoBody)
 
-    const response = await $fetch('https://api.brevo.com/v3/contacts', {
+    await $fetch('https://api.brevo.com/v3/contacts/doubleOptinConfirmation', {
       method: 'POST',
       headers: {
-        'accept': 'application/json',
+        accept: 'application/json',
         'api-key': config.brevoApiKey,
         'content-type': 'application/json'
       },
@@ -59,18 +101,18 @@ export default defineEventHandler(async (event) => {
     })
 
     return {
-      success: true,
-      id: (response as { id?: number })?.id
+      success: true
     }
   } catch (error: unknown) {
     // Handle Brevo API errors
     const fetchError = error as { statusCode?: number; data?: { code?: string; message?: string } }
 
     // Contact already exists (duplicate_parameter error) - treat as success
+    // User will receive another confirmation email
     if (fetchError.data?.code === 'duplicate_parameter') {
       return {
         success: true,
-        message: 'Already subscribed'
+        message: 'Confirmation email sent'
       }
     }