Feature/cloudfront function/app handler

docs/cloudformation/app-geo-ca-stack.yml

@@ -9,7 +9,7 @@ Parameters:
   SslCertArn:
     Type: AWS::SSM::Parameter::Value<String>
     Default: /webpresence/app-geo-ca/ssl-cert-arn
-    Description: SSM parameter name for app.geo.ca ACM SSL Cert ARN     
+    Description: SSM parameter name for app.geo.ca ACM SSL Cert ARN
   WebAclArn:
     Type: String
     Description: ARN of the WAF web ACL to use for CloudFront
@@ -100,7 +100,7 @@ Resources:
                   - 'logs:CreateLogGroup'
                   - 'logs:CreateLogStream'
                   - 'logs:PutLogEvents'
-                Resource: '*'              
+                Resource: '*'
 
 
   AppCodeBuildProject:
@@ -313,7 +313,7 @@ Resources:
                 - Name: AppBuild
               RunOrder: 1
               Configuration:
-                ProjectName: !Ref AppCodeBuildProject                
+                ProjectName: !Ref AppCodeBuildProject
         - Name: Deploy
           Actions:
             - Name: Deploy
@@ -371,6 +371,9 @@ Resources:
           LambdaFunctionAssociations:
             - EventType: origin-response
               LambdaFunctionARN: !Ref SecHeadersLambdaEdgeArn
+          FunctionAssociations:
+            - EventType: viewer-request
+              FunctionARN: !GetAtt CloudfrontAppHandler.FunctionMetadata.FunctionARN
         DefaultRootObject: index.html
         HttpVersion: http2
         WebACLId: !Ref WebAclArn
@@ -398,4 +401,35 @@ Resources:
             ResponsePagePath: /index.html
             ResponseCode: 200
 
-
+  CloudfrontAppHandler:
+    Type: AWS::CloudFront::Function
+    Properties: 
+      AutoPublish: true
+      FunctionCode: >
+        function handler(event) {
+          var request = event.request;
+          // Redirects requests to the www. url to the non www. url.
+          if (request.headers && request.headers.host && request.headers.host.value.includes('www.')) {
+            var newurl = request.headers.host.value.replace('www.', '')
+            var qs = ''
+            Object.keys(request.querystring).forEach((e) => {
+              if (qs === '') {
+                qs += '?';
+              } else { qs += '&' };
+              qs += e + '=' + request.querystring[e].value;
+            })
+            var response = {
+              statusCode: 301,
+              statusDescription: 'Moved Permanently',
+              headers:
+                { "location": { "value": 'https://' + newurl + request.uri + qs } }
+            }
+            return response;
+          }
+
+          return request;
+        }
+      FunctionConfig: 
+        Comment: A function run on every request to app.geo.ca
+        Runtime: cloudfront-js-1.0
+      Name: app-handler