Amplify get Hosting URL in lambda as environment variable

Question

I need the URL of Cloudfront distribution that I added with amplify cli as an environment variable. Status:

I found how template variables are added in file "api-cloudformation-template.json" under my function config. Desired Output variable from "hosting/S3AndCloudFront/template.json" is CloudFrontSecureURL. So I added rows to lambda config file, like so:

 {
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "Lambda resource stack creation using Amplify CLI",
    "Parameters": {
        ...
        "hostingS3AndCloudFrontHostingBucketName": { // working example
            "Type": "String",
            "Default": "hostingS3AndCloudFrontHostingBucketName"
        },
        "hostingS3AndCloudFrontCloudFrontSecureURL": { // my example
            "Type": "String",
            "Default": "hostingS3AndCloudFrontCloudFrontSecureURL"
        },
    },
    "Resources": {
        "LambdaFunction": {
            "Type": "AWS::Lambda::Function",
            "Metadata": {
                "aws:asset:path": "./src",
                "aws:asset:property": "Code"
            },
            "Properties": {
                ...
                "Environment": {
                    "Variables": {
                        ...
                        "HOSTING_S3ANDCLOUDFRONT_HOSTINGBUCKETNAME": {
                            "Ref": "hostingS3AndCloudFrontHostingBucketName"
                        },
                        "HOSTING_S3ANDCLOUDFRONT_CLOUDFRONTSECUREURL": {
                            "Ref": "hostingS3AndCloudFrontCloudFrontSecureURL"
                        }
                    }
                },

            }
        }
    ....
    },
    ....
}

I'm getting hostingS3AndCloudFrontCloudFrontSecureURL (default value) in process.env.HOSTING_S3ANDCLOUDFRONT_CLOUDFRONTSECUREURL after publishing function.

can you post the tutorial that you are following, you are trying to pass the 'cloudfront' url to the lambda as environment variable, but you are not getting it, because the parameter is not getting passed during the deployment via amplify, correct? — Arun K

Eph Harris Eph Harris · Accepted Answer · 2019-12-11T21:27:25

Try using the Outputs section of the template along with Fn::ImportValue function documentation HERE

CloudFront Stack:

{
   ...
   "Outputs" : {
     "CloudfrontDomainOutput" : {
       "Description" : "The cloudfront domain",
       "Value" : { 
           "Fn::GetAtt": [
                           "hostingS3AndCloudFrontCloudFrontSecureURL",
                           "DomainName"
                          ]
       },
       "Export" : {
         "Name" : {"Fn::Sub": "${AWS::StackName}-hostingS3AndCloudFrontCloudFrontSecureURL" }
       }
    }
}

Lambda Stack



{
  ...
   "Environment": {
       "Variables": {
               "HOSTING_S3ANDCLOUDFRONT_HOSTINGBUCKETNAME": {
                   "Ref": "hostingS3AndCloudFrontHostingBucketName"
                },
                "HOSTING_S3ANDCLOUDFRONT_CLOUDFRONTSECUREURL": {
                      "Fn::ImportValue" : {"Fn::Sub" : "${CloudFront_Stack_Name}-hostingS3AndCloudFrontCloudFrontSecureURL"}
                }
         }
     }
}

Amplify get Hosting URL in lambda as environment variable

1 Answers