logemann · July 20, 2020 11:38 · Jul 20, 2020 · Jul 20, 2020
diff --git a/contactForm.ts b/contactForm.ts
@@ -0,0 +1,93 @@
+import Sns from "aws-sdk/clients/sns";
+import axios from 'axios';
+import * as querystring from 'querystring';
+
+const reCapUrl = "https://www.google.com/recaptcha/api/siteverify";
+
+// we got this from personal reCaptcha Google Page
+const reCaptchaSecret = "xxxxxxxxxxxxxxxxxxxxxxxx" ;
+
+function bodyToMap(parts: any) : Map<String, String>{
+    let result = new Map();
+    // grab the params
+    for (let i = 0, len = parts.length; i < len; i++) {
+        let kVal = parts[i].split('=');
+        // replace the + space then decode
+        let key = decodeURIComponent(kVal[0].replace(/\+/g, ' '));
+        result.set(key, decodeURIComponent(kVal[1].replace(/\+/g, ' ')));
+    }
+    return result;
+}
+
+export const handler = async (event: any = {}): Promise<any> => {
+    console.log("Starting ContactForm Processing for website okaycloud form.");
+
+    let body = event.body;
+    // process the urlencoded body of the form submit and put it in a
+    // map structure
+    let parts = body.split('&');
+    let result = bodyToMap(parts);
+
+    // its always a good idea to log so that we can inspect the params
+    // later in Amazon Cloudwatch
+    //console.log(result);
+
+    let data = querystring.stringify({
+        secret: reCaptchaSecret,
+        response: result.get("g-recaptcha-response")
+    });
+
+    //console.log(`Verify Post Data: ${JSON.stringify(data)}`);
+    //console.log(`Verify Post Data Form Encoded: ${data}`);
+
+    // verify the result by POSTing to google backend with secret and
+    // frontend recaptcha token as payload
+    let verifyResult = await axios.post(reCapUrl, data);
+
+    // if you like you can also print out the result of that. Its
+    // a bit verbose though
+    //console.log(`Success ist: ${JSON.stringify(verifyResult.data)}`);
+
+    if (verifyResult.data.success) {
+        let emailbody = `—— Contactform —-
+            
+            Name: ${result.get('FULLNAME')} 
+            
+            Email: ${result.get('EMAIL')}
+            Tel: ${result.get('PHONE')}
+            
+            Thema: ${result.get('SUBJECT')}
+            
+            * Nachricht * 
+            ${result.get("MESSAGE")}
+         `;
+
+        let sns = new Sns();
+
+        let params = {
+            Message: emailbody,
+            Subject: `Contactform:  ${result.get("SUBJECT")}`,
+            TopicArn: process.env.TOPIC_ARN
+        };
+
+        // we publish the created message to Amazon SNS now…
+        await sns.publish(params).promise();
+
+        // now we return a HTTP 302 together with a URL to redirect the
+        // browser to success URL (we put in google.com for simplicty)
+        return {
+            statusCode: 302,
+            headers: {
+                Location: "https://mydomain.com/contact_success.html",
+            }
+        };
+    } else {
+        console.log("reCaptcha check failed. Most likely SPAM.");
+        return {
+            statusCode: 302,
+            headers: {
+                Location: "https://mydomain.com/contact_failure.html",
+            }
+        };
+    }
+};