---
AWSTemplateFormatVersion: '2010-09-09'
Parameters:
  HookURL:
    Type: String
    Description: 'Please enter the web hook url from Chime:'
    NoEcho: true
Resources:
  LambdaFunctionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Effect: Allow
          Principal:
            Service:
            - lambda.amazonaws.com
          Action:
          - sts:AssumeRole
      Path: "/"
  LambdaRolePolicies:
    Type: AWS::IAM::Policy
    Properties:
      PolicyName: LambdaPolicy
      PolicyDocument:
        Version: '2012-10-17'
        Statement:
        - Sid: Stmt12349896368829
          Action:
          - logs:CreateLogGroup
          - logs:CreateLogStream
          - logs:PutLogEvents
          Effect: Allow
          Resource: arn:aws:logs:*:*:*
      Roles:
      - Ref: LambdaFunctionRole
  ChimeNotifierLambdaFn:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.lambda_handler
      Role:
        Fn::GetAtt:
        - LambdaFunctionRole
        - Arn
      Environment:
        Variables:
          CHIMEWEBHOOK : !Ref HookURL
      Code:
        ZipFile: !Sub |
          #Sample Lambda Function to post notifications to a Chime room when an AWS Health event happens
          from __future__ import print_function
          import json
          import logging
          import os
          from urllib2 import Request, urlopen, URLError, HTTPError
          # Setting up logging
          logger = logging.getLogger()
          logger.setLevel(logging.INFO)
          # main function
          def lambda_handler(event, context):
            message =  str(event['detail']['eventDescription'][0]['latestDescription']  + " https://phd.aws.amazon.com/phd/home?region=us-east-1#/event-log?eventID=" + event['detail']['eventArn'])
            json.dumps(message)
            chime_message = {'Content': message}
            logger.info(str(chime_message))
            webhookurl = str(os.environ['CHIMEWEBHOOK'])
            req = Request(webhookurl, json.dumps(chime_message))
            try:
              response = urlopen(req)
              response.read()
              logger.info("Message posted: %s", chime_message['Content'])
            except HTTPError as e:
              logger.error("Request failed : %d %s", e.code, e.reason)
            except URLError as e:
              logger.error("Server connection failed: %s", e.reason)   
      Runtime: python2.7
      Timeout: '60'
  LambdaInvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName:
        Fn::GetAtt:
        - ChimeNotifierLambdaFn
        - Arn
      Action: lambda:InvokeFunction
      Principal: events.amazonaws.com
      SourceArn:
        Fn::GetAtt:
        - CloudWatchEventRule
        - Arn
  CloudWatchEventRule:
    Type: AWS::Events::Rule
    Properties:
      Description: EventRule
      EventPattern:
        source:
        - aws.health
      State: ENABLED
      Targets:
      - Arn:
          Fn::GetAtt:
          - ChimeNotifierLambdaFn
          - Arn
        Id: ChimeNotifierLambdaFn