Amplify get Hosting URL in lambda as environment variable - aws-lambda

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.

Answer 1

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"}
}
}
}
}