n-daisuke-blog-deployment-source/infra/cfn/template-lambda-function.yaml

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Parameters:
  StageName:
    Type: String
    Default: Prod
    Description: Name of the API stage

  SourceBucketName:
    Type: String
    Default: naputo-blog-source
    Description: S3 bucket for blog source files

  RepoURL:
    Type: String
    Default: "https://git.n-daisuke897.com/nakada0907/n-daisuke897-blog.git"
    Description: Git repository URL

  RepoBranch:
    Type: String
    Default: main
    Description: Git repository branch

  ImageDigest:
    Type: String
    Default: ""
    Description: "ECR image digest (e.g., sha256:abc123...). If empty, uses 'latest' tag. Use digest for deterministic deployments."

Conditions:
  UseDigest: !Not [!Equals [!Ref ImageDigest, ""]]

Resources:

  MyLambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service:
                - lambda.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: LambdaS3PutObjectPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - s3:PutObject
                  - s3:GetObject
                  - s3:ListBucket
                Resource:
                  - !Sub "arn:aws:s3:::${SourceBucketName}"
                  - !Sub "arn:aws:s3:::${SourceBucketName}/*"
        - PolicyName: LambdaEcrImagePullPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - ecr:GetAuthorizationToken
                Resource: "*"
              - Effect: Allow
                Action:
                  - ecr:BatchGetImage
                  - ecr:BatchCheckLayerAvailability
                  - ecr:GetDownloadUrlForLayer
                Resource:
                  Fn::ImportValue: BlogDeployment-RepositoryArn
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  MyLambdaFunction:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: blog-deployment-webhook-handler
      PackageType: Image
      ImageUri: !If
        - UseDigest
        - !Sub
          - "${RepoUri}@${Digest}"
          - RepoUri: !ImportValue BlogDeployment-RepositoryUri
            Digest: !Ref ImageDigest
        - !Sub
          - "${RepoUri}:latest"
          - RepoUri: !ImportValue BlogDeployment-RepositoryUri
      Timeout: 300
      MemorySize: 512
      Architectures:
        - arm64
      AutoPublishAlias: live
      Environment:
        Variables:
          REPO_URL: !Ref RepoURL
          REPO_BRANCH: !Ref RepoBranch
          S3_BUCKET: !Ref SourceBucketName
          S3_KEY: "source.zip"
          WEBHOOK_SECRET:
            Fn::Sub:
              - "{{resolve:secretsmanager:${SecretArn}:SecretString:secretNumber:AWSCURRENT}}"
              - SecretArn:
                  Fn::ImportValue: SecretForWebhook-ARN
      Role: !GetAtt MyLambdaRole.Arn
      Events:
        ForgejoWebhook:
          Type: Api
          Properties:
            RestApiId: !Ref MyApi
            Path: /forgejo-webhook
            Method: POST

  MyApi:
    Type: AWS::Serverless::Api
    Properties:
      Name: blog-deployment-webhook-api
      StageName: !Ref StageName
      EndpointConfiguration: REGIONAL
      DefinitionBody:
        openapi: "3.0.1"
        info:
          title: "Forgejo Webhook API"
          version: "1.0"
        paths:
          /forgejo-webhook:
            post:
              summary: "Trigger Lambda via Forgejo Webhook"
              x-amazon-apigateway-integration:
                uri:
                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${MyLambdaFunction.Arn}/invocations
                httpMethod: POST
                type: aws_proxy
              responses:
                '200':
                  description: "Successful response"
                '400':
                  description: "Bad Request - Incorrect request payload format"
                '401':
                  description: "Unauthorized - Signature verification failed"
                '500':
                  description: "Server error - Deployment process failed"

Outputs:
  ApiEndpoint:
    Description: API Gateway endpoint URL for webhook
    Value: !Sub "https://${MyApi}.execute-api.${AWS::Region}.amazonaws.com/${StageName}/forgejo-webhook"
    Export:
      Name: !Sub "${AWS::StackName}-ApiEndpoint"

  LambdaFunctionArn:
    Description: Lambda function ARN
    Value: !GetAtt MyLambdaFunction.Arn
    Export:
      Name: !Sub "${AWS::StackName}-LambdaArn"

  LambdaFunctionName:
    Description: Lambda function name
    Value: !Ref MyLambdaFunction
    Export:
      Name: !Sub "${AWS::StackName}-LambdaName"