Add newletter sub

website/docusaurus.config.js

@@ -279,6 +279,14 @@ const config = {
           loading: process.env.GISCUS_LOADING || 'lazy'
         },
       }),
+      // Newsletter email collection configuration (Kit API v4)
+      // See here for more information: https://developers.kit.com/api-reference/overview
+      ...(process.env.NEWSLETTER_API_KEY && {
+        newsletter: {
+          isEnabled: true,
+          apiUrl: process.env.NEWSLETTER_API_URL || 'https://api.kit.com/v4',
+        },
+      }),
     }),
   plugins: [
     process.env.POSTHOG_API_KEY && [

website/netlify/functions/newsletter-subscribe.js

@@ -0,0 +1,219 @@
+/**
+ * Netlify Serverless Function to handle newsletter form submissions
+ * 
+ * This function securely handles Kit API integration by keeping
+ * the API key on the server side. It validates input, sanitizes data,
+ * and handles errors gracefully following Netlify best practices.
+ * 
+ * @see https://docs.netlify.com/functions/overview/
+ * @see https://developers.kit.com/api-reference/subscribers/create-a-subscriber
+ */
+
+/**
+ * Get the allowed CORS origin based on environment
+ * @returns {string} The allowed origin (site URL in production, '*' in development)
+ */
+function getCorsOrigin() {
+  return process.env.NODE_ENV === 'production' 
+    ? process.env.URL || '*' 
+    : '*';
+}
+
+/**
+ * Build headers with CORS for JSON responses
+ * @param {Object} additionalHeaders - Additional headers to include
+ * @returns {Object} Headers object with CORS and content type
+ */
+function buildCorsHeaders(additionalHeaders = {}) {
+  return {
+    'Content-Type': 'application/json',
+    'Access-Control-Allow-Origin': getCorsOrigin(),
+    ...additionalHeaders,
+  };
+}
+
+/**
+ * Build full CORS headers for preflight responses (no Content-Type)
+ * @returns {Object} Complete CORS headers object
+ */
+function buildFullCorsHeaders() {
+  return {
+    'Access-Control-Allow-Origin': getCorsOrigin(),
+    'Access-Control-Allow-Methods': 'POST',
+    'Access-Control-Allow-Headers': 'Content-Type',
+  };
+}
+
+/**
+ * Build headers for JSON responses with full CORS support
+ * @returns {Object} Headers object with Content-Type and full CORS headers
+ */
+function buildJsonCorsHeaders() {
+  return {
+    'Content-Type': 'application/json',
+    ...buildFullCorsHeaders(),
+  };
+}
+
+exports.handler = async (event, context) => {
+  // Only allow POST requests
+  if (event.httpMethod !== 'POST') {
+    return {
+      statusCode: 405,
+      headers: buildJsonCorsHeaders(),
+      body: JSON.stringify({ error: 'Method not allowed' }),
+    };
+  }
+
+  // Handle CORS preflight
+  if (event.httpMethod === 'OPTIONS') {
+    return {
+      statusCode: 200,
+      headers: buildFullCorsHeaders(),
+      body: '',
+    };
+  }
+
+  try {
+    // Parse request body
+    let body;
+    try {
+      body = JSON.parse(event.body);
+    } catch (parseError) {
+      return {
+        statusCode: 400,
+        headers: buildCorsHeaders(),
+        body: JSON.stringify({ error: 'Invalid JSON in request body' }),
+      };
+    }
+
+    const { email, firstName, lastName, ...customFields } = body;
+
+    // Validate email (RFC 5322 compliant regex)
+    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    if (!email || !emailRegex.test(email)) {
+      return {
+        statusCode: 400,
+        headers: buildCorsHeaders(),
+        body: JSON.stringify({ error: 'Valid email is required' }),
+      };
+    }
+
+    // Get configuration from environment variables
+    const newsletterApiKey = process.env.NEWSLETTER_API_KEY;
+    const apiUrl = process.env.NEWSLETTER_API_URL || 'https://api.kit.com/v4';
+
+    if (!newsletterApiKey) {
+      console.error('Newsletter API configuration missing:', {
+        hasApiKey: !!newsletterApiKey,
+      });
+      return {
+        statusCode: 500,
+        headers: buildCorsHeaders(),
+        body: JSON.stringify({ error: 'Server configuration error' }),
+      };
+    }
+
+    // Prepare subscriber data for Kit API v4
+    // Kit API expects: email_address, first_name, state, fields
+    const subscriberData = {
+      email_address: email.trim().toLowerCase(),
+      ...(firstName && { first_name: firstName.trim() }),
+      state: 'active', // Default to active state
+      ...(Object.keys(customFields).length > 0 && {
+        fields: Object.entries(customFields).reduce((acc, [key, value]) => {
+          // Only include non-empty custom fields
+          if (value !== null && value !== undefined && value !== '') {
+            acc[key] = String(value);
+          }
+          return acc;
+        }, {}),
+      }),
+    };
+
+    // Call Kit API with timeout
+    // Kit API requires X-Kit-Api-Key header
+    const controller = new AbortController();
+    const timeoutId = setTimeout(() => controller.abort(), 10000); // 10 second timeout
+
+    try {
+      const kitUrl = `${apiUrl}/subscribers`;
+      const kitResponse = await fetch(kitUrl, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'X-Kit-Api-Key': newsletterApiKey,
+        },
+        body: JSON.stringify(subscriberData),
+        signal: controller.signal,
+      });
+
+      clearTimeout(timeoutId);
+
+      const kitData = await kitResponse.json();
+
+      if (!kitResponse.ok) {
+        console.error('Kit API error:', {
+          status: kitResponse.status,
+          statusText: kitResponse.statusText,
+          data: kitData,
+        });
+
+        // Don't expose internal API errors to client
+        const errorMessage = kitData.message || 'Failed to subscribe. Please try again.';
+
+        return {
+          statusCode: kitResponse.status >= 400 && kitResponse.status < 500 
+            ? kitResponse.status 
+            : 500,
+          headers: buildCorsHeaders(),
+          body: JSON.stringify({ 
+            error: errorMessage,
+          }),
+        };
+      }
+
+      // Success response
+      return {
+        statusCode: 200,
+        headers: buildJsonCorsHeaders(),
+        body: JSON.stringify({ 
+          success: true,
+          message: 'Successfully subscribed!',
+          data: kitData,
+        }),
+      };
+
+    } catch (fetchError) {
+      clearTimeout(timeoutId);
+
+      if (fetchError.name === 'AbortError') {
+        console.error('Request timeout to Kit API');
+        return {
+          statusCode: 504,
+          headers: buildCorsHeaders(),
+          body: JSON.stringify({ 
+            error: 'Request timeout. Please try again.',
+          }),
+        };
+      }
+
+      throw fetchError; // Re-throw to be caught by outer catch
+    }
+
+  } catch (error) {
+    console.error('Function error:', {
+      message: error.message,
+      stack: error.stack,
+    });
+
+    return {
+      statusCode: 500,
+      headers: buildCorsHeaders(),
+      body: JSON.stringify({ 
+        error: 'Internal server error',
+        message: process.env.NODE_ENV === 'development' ? error.message : undefined,
+      }),
+    };
+  }
+};

website/package.json

@@ -26,6 +26,7 @@
     "prism-react-renderer": "^2.3.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
+    "react-hot-toast": "^2.4.1",
     "three": "^0.181.2"
   },
   "devDependencies": {