redirect-maintain-uri-querystring

redirect_maintain_uri_querystring/index.js

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+function objectToQueryString(obj) {
+    var str = [];
+    for (var param in obj)
+        if (obj[param].multiValue)
+            str.push(param + "=" + obj[param].multiValue.map((item) => item.value).join(','));
+        else if (obj[param].value == '')
+            str.push(param);
+        else
+            str.push(param + "=" + obj[param].value);
+
+    return str.join("&");
+}
+
+function handler(event) {
+    var request = event.request;
+    var headers = request.headers;
+    var uri = request.uri;
+    var loc = "";
+    var newdomain = "newdomain.com";
+
+    if (Object.keys(request.querystring).length) 
+        loc = `https://${newdomain}${uri}?${objectToQueryString(request.querystring)}`
+    else 
+        loc = `https://${newdomain}${uri}`
+
+    var response = {
+        statusCode: 302,
+        statusDescription: 'Found',
+        headers: {
+            'location': { value: `${loc}` }      
+        }
+    };
+    return response;
+}

redirect_maintain_uri_querystring/readme.md

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+## Redirect (temporary) to new domain
+
+**CloudFront Functions event type: viewer response**
+
+This function will perform a redirect (302 - temporary) to a new domain while maintaining the uri and query string values in the destination FQDN.
+
+If you want a permanent redirect,  change statusCode from 302 to 301 in function code.
+
+**Important: Set the `newdomain` variable to an appropriate value for your specific needs.**
+
+**Testing the function**
+
+To validate that the function is working as expected, you can use the provided test object from https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/functions-event-structure.html#functions-event-structure-example and test in the console using the instructions https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/test-function.html#test-function-console.
+
+If the function has been set up correctly, you should see a result similar to the following with the value of 'newdomain',  and the uri and querystring values from the test object being added in the 'location' response header in `FunctionOutput` JSON object:
+```
+{
+  "response": {
+    "headers": {
+      "location": {
+        "value": "https://newdomain.com/media/index.mpd?ID=42&Exp=1619740800&TTL=1440&querymv=val1,val2,val3"
+      }
+    },
+    "statusDescription": "Found",
+    "cookies": {},
+    "statusCode": 302
+  }
+  ...