# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0

AWSTemplateFormatVersion: '2010-09-09'
Description: 'Amazon Redshift user defined functions for Amazon Location Service APIs'
Parameters:
  OriginBucketName:
    AllowedPattern: ^[0-9a-zA-Z]+([0-9a-zA-Z-]*[0-9a-zA-Z])*$
    Default: redshift-udf-als-dev
    Type: String
  OriginKeyPrefix:
    AllowedPattern: ^[0-9a-zA-Z-/]*$
    Default: resources/
    Type: String
  PlaceIndex:
    AllowedPattern: ^[0-9a-zA-Z-._]*$
    Type: String
Resources:
  LambdaZipsBucket:
    Type: AWS::S3::Bucket
    Properties:
      VersioningConfiguration:
        Status: Enabled
      BucketEncryption:
        ServerSideEncryptionConfiguration:
        - ServerSideEncryptionByDefault:
            SSEAlgorithm: AES256
  CopyZips:
    Type: Custom::CopyZips
    Properties:
      ServiceToken: !GetAtt 'CopyZipsFunction.Arn'
      DestBucket: !Ref 'LambdaZipsBucket'
      SourceBucket: !Ref 'OriginBucketName'
      Prefix: !Ref 'OriginKeyPrefix'
      Objects:
        - lambdas/geocoding.zip
        - lambdas/reverse_geocoding.zip
  CopyZipsRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      Path: /
      Policies:
        - PolicyName: lambda-copier
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - s3:GetObject
                Resource:
                  - !Sub 'arn:aws:s3:::${OriginBucketName}/${OriginKeyPrefix}*'
              - Effect: Allow
                Action:
                  - s3:PutObject
                  - s3:DeleteObject
                Resource:
                  - !Sub 'arn:aws:s3:::${LambdaZipsBucket}/${OriginKeyPrefix}*'
  CopyZipsFunction:
    Type: AWS::Lambda::Function
    Properties:
      Description: Copies objects from a source S3 bucket to a destination
      Handler: index.handler
      Runtime: python2.7
      Role: !GetAtt 'CopyZipsRole.Arn'
      Timeout: 240
      Code:
        ZipFile: |
          import json
          import logging
          import threading
          import boto3
          import cfnresponse


          def copy_objects(source_bucket, dest_bucket, prefix, objects):
              s3 = boto3.client('s3')
              for o in objects:
                  key = prefix + o
                  copy_source = {
                      'Bucket': source_bucket,
                      'Key': key
                  }
                  print('copy_source: %s' % copy_source)
                  print('dest_bucket = %s'%dest_bucket)
                  print('key = %s' %key)
                  s3.copy_object(CopySource=copy_source, Bucket=dest_bucket,
                        Key=key)


          def delete_objects(bucket, prefix, objects):
              s3 = boto3.client('s3')
              objects = {'Objects': [{'Key': prefix + o} for o in objects]}
              s3.delete_objects(Bucket=bucket, Delete=objects)


          def timeout(event, context):
              logging.error('Execution is about to time out, sending failure response to CloudFormation')
              cfnresponse.send(event, context, cfnresponse.FAILED, {}, None)


          def handler(event, context):
              # make sure we send a failure to CloudFormation if the function
              # is going to timeout
              timer = threading.Timer((context.get_remaining_time_in_millis()
                        / 1000.00) - 0.5, timeout, args=[event, context])
              timer.start()

              print('Received event: %s' % json.dumps(event))
              status = cfnresponse.SUCCESS
              try:
                  source_bucket = event['ResourceProperties']['SourceBucket']
                  dest_bucket = event['ResourceProperties']['DestBucket']
                  prefix = event['ResourceProperties']['Prefix']
                  objects = event['ResourceProperties']['Objects']
                  if event['RequestType'] == 'Delete':
                      delete_objects(dest_bucket, prefix, objects)
                  else:
                      copy_objects(source_bucket, dest_bucket, prefix, objects)
              except Exception as e:
                  logging.error('Exception: %s' % e, exc_info=True)
                  status = cfnresponse.FAILED
              finally:
                  timer.cancel()
                  cfnresponse.send(event, context, status, {}, None)

  GeocodeFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      Policies:
        - PolicyName: GeoocodingPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - geo:SearchPlaceIndexForText
                Resource: !Sub 'arn:aws:geo:${AWS::Region}:${AWS::AccountId}:place-index/${PlaceIndex}'
  ReverseGeocodeFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole
      Policies:
        - PolicyName: ReverseGeoocodingPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - geo:SearchPlaceIndexForPosition
                Resource: !Sub 'arn:aws:geo:${AWS::Region}:${AWS::AccountId}:place-index/${PlaceIndex}'
  GeocodeFunction:
    DependsOn: CopyZips
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: RedshiftUDFGeocodeFunction
      Description: A Lambda to work as a Redshift UDF to geocode values passed as parameters
      Handler: geocoding_lambda/lambda_function.handler
      Runtime: python3.7
      Role: !GetAtt 'GeocodeFunctionRole.Arn'
      Timeout: 300
      Code:
        S3Bucket: !Ref 'LambdaZipsBucket'
        S3Key: !Sub '${OriginKeyPrefix}lambdas/geocoding.zip'
      Environment:
        Variables:
          PLACE_INDEX: !Ref 'PlaceIndex'
  ReverseGeocodeFunction:
    DependsOn: CopyZips
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: RedshiftUDFReverseGeocodeFunction
      Description: A Lambda to work as a Redshift UDF to reverse geocode values passed as parameters
      Handler: reverse_geocoding_lambda/lambda_function.handler
      Runtime: python3.7
      Role: !GetAtt 'ReverseGeocodeFunctionRole.Arn'
      Timeout: 300
      Code:
        S3Bucket: !Ref 'LambdaZipsBucket'
        S3Key: !Sub '${OriginKeyPrefix}lambdas/reverse_geocoding.zip'
      Environment:
        Variables:
          PLACE_INDEX: !Ref 'PlaceIndex'
  RedshiftGeocodeFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: RedshiftGeocodeFunctionRole
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: redshift.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: RedshiftGeocodeFunctionPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - lambda:InvokeFunction
                Resource: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:RedshiftUDFGeocodeFunction'
  RedshiftReverseGeocodeFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: RedshiftReverseGeocodeFunctionRole
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: redshift.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: RedshiftReverseGeocodeFunctionPolicy
          PolicyDocument:
            Version: '2012-10-17'
            Statement:
              - Effect: Allow
                Action:
                  - lambda:InvokeFunction
                Resource: !Sub 'arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:RedshiftUDFReverseGeocodeFunction'