Merge pull request #95 from companieshouse/add-cloudfront-function

Add CloudFront function

groups/promo-infrastructure/functions/gov_uk_redirect.js

@@ -0,0 +1,35 @@
+async function handler(event) {
+    const request = event.request;
+
+    const gov_uk_prefix = 'https://gov.uk';
+    const filing_uri_prefix = '/arefiling/';
+    const freedom_of_information_uri_prefix = '/freedominformation/freedominfo.shtml';
+    const press_desk_uri_prefix = '/pressDesk/introduction.shtml';
+
+    let uri = request.uri;
+
+    if (uri.startsWith(filing_uri_prefix)) {
+        uri = uri.replace(filing_uri_prefix, '/file-your-confirmation-statement-with-companies-house/');
+    } else if (uri.startsWith(freedom_of_information_uri_prefix)) {
+        uri = uri.replace(freedom_of_information_uri_prefix, '/government/organisations/companies-house/about/personal-information-charter/');
+    } else if (uri.startsWith(press_desk_uri_prefix)) {
+        uri = uri.replace(press_desk_uri_prefix, '/government/organisations/companies-house/about/media-enquiries/');
+    } else if (uri.endsWith('/')) {
+        // Append default index file name to request
+        request.uri += 'index.shtml';
+        return request;
+    } else {
+        // Proceed with request; do not generate a redirect
+        return request;
+    }
+
+    const response = {
+        statusCode: 301,
+        statusDescription: 'Moved Permanently',
+        headers: {
+            'location': { 'value': gov_uk_prefix + uri }
+        }
+    }
+
+    return response;
+}