voteApp-CF-template.json

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Metadata": {
    "License": "Apache-2.0"
  },
  "Description":
    "This template creates a serverless version of the Docker Vote VoteApp\n **WARNING** This template creates a DynamoDB table and ApiGateway. \n  You will be billed for the AWS resources used if you create a stack \n from this template.",
  "Resources": {
    "VoteAppDynamoDBTable": {
      "Type": "AWS::DynamoDB::Table",
      "Properties": {
        "AttributeDefinitions": [
          {
            "AttributeName": "topic",
            "AttributeType": "S"
          }
        ],
        "KeySchema": [
          {
            "AttributeName": "topic",
            "KeyType": "HASH"
          }
        ],
        "BillingMode": "PAY_PER_REQUEST"
      }
    },
    "VoteAppApigwRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": { "Service": ["apigateway.amazonaws.com"] },
              "Action": ["sts:AssumeRole"]
            }
          ]
        },
        "Policies": [
          {
            "PolicyName": "VoteAppDynamoDBPolicy",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": ["dynamodb:Query", "dynamodb:UpdateItem"],
                  "Resource": {
                    "Fn::GetAtt": ["VoteAppDynamoDBTable", "Arn"]
                  }
                }
              ]
            }
          }
        ]
      }
    },
    "VoteAppApigwCwRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": { "Service": ["apigateway.amazonaws.com"] },
              "Action": ["sts:AssumeRole"]
            }
          ]
        },
        "Policies": [
          {
            "PolicyName": "VoteAppCloudWatchPolicy",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "logs:CreateLogGroup",
                    "logs:CreateLogStream",
                    "logs:DescribeLogGroups",
                    "logs:DescribeLogStreams",
                    "logs:PutLogEvents",
                    "logs:GetLogEvents",
                    "logs:FilterLogEvents"
                  ],
                  "Resource": "*"
                }
              ]
            }
          }
        ]
      }
    },
    "VoteAppApi": {
      "Type": "AWS::ApiGateway::RestApi",
      "Properties": {
        "Name": "VoteAppApi",
        "Description": "API for the voting demo",
        "FailOnWarnings": true,
        "Body": {
          "swagger": "2.0",
          "info": {
            "version": "2018-03-18T15:12:17Z",
            "title": "vote"
          },
          "host": "voteapi.execute-api.region.amazonaws.com",
          "basePath": "/VoteApp",
          "schemes": ["https"],
          "paths": {
            "/results": {
              "get": {
                "consumes": ["application/json"],
                "produces": ["application/json"],
                "responses": {
                  "200": {
                    "description": "200 response",
                    "schema": {
                      "$ref": "#/definitions/Results"
                    }
                  }
                },
                "x-amazon-apigateway-integration": {
                  "credentials": {
                    "Fn::GetAtt": ["VoteAppApigwRole", "Arn"]
                  },
                  "responses": {
                    "default": {
                      "statusCode": "200",
                      "responseTemplates": {
                          "application/json": "#set($inputRoot = $input.path('$'))\n{\n  \"success\" : true,\n  \"result\" : {\n#if($inputRoot.Count==0)\n    \"a\" : 0,\n    \"b\" : 0\n#{else}\n    \"a\" : #if($inputRoot.Items[0].a==\"\")0#{else}$inputRoot.Items[0].a.N#end,\n    \"b\" : #if($inputRoot.Items[0].b==\"\")0#{else}$inputRoot.Items[0].b.N#end\n#end\n     }\n}"
                        }
                    }
                  },
                  "requestTemplates": {
                    "application/json": {
                      "Fn::Join": [
                        "",
                        [
                          "{ \n    \"TableName\" : \"",
                          { "Ref": "VoteAppDynamoDBTable" },
                          "\",\n    \"KeyConditionExpression\": \"topic = :v1\",\n    \"ExpressionAttributeValues\": {\n        \":v1\": {\n            \"S\": \"default\"\n        }\n    }\n}"
                        ]
                      ]
                    }
                  },
                  "uri": {
                    "Fn::Join": [
                      "",
                      [
                        "arn:aws:apigateway:",
                        {
                          "Ref": "AWS::Region"
                        },
                        ":dynamodb:action/Query"
                      ]
                    ]
                  },
                  "passthroughBehavior": "never",
                  "httpMethod": "POST",
                  "type": "aws"
                }
              }
            },
            "/vote": {
              "post": {
                "consumes": ["application/json"],
                "produces": ["application/json"],
                "parameters": [
                  {
                    "in": "body",
                    "name": "Vote",
                    "required": true,
                    "schema": {
                      "$ref": "#/definitions/Vote"
                    }
                  }
                ],
                "responses": {
                  "200": {
                    "description": "200 response",
                    "schema": {
                      "$ref": "#/definitions/Empty"
                    }
                  }
                },
                "x-amazon-apigateway-request-validator": "Validate body",
                "x-amazon-apigateway-integration": {
                  "credentials": {
                    "Fn::GetAtt": ["VoteAppApigwRole", "Arn"]
                  },
                  "responses": {
                    "default": {
                      "statusCode": "200"
                    }
                  },
                  "requestTemplates": {
                    "application/json": {
                      "Fn::Join": [
                        "",
                        [
                          "{ \n    \"TableName\" : \"",
                          { "Ref": "VoteAppDynamoDBTable" },
                          "\",\n    \"Key\": {\n        \"topic\": {\n            \"S\":\"default\"\n        }\n     },\n    \"UpdateExpression\": \"ADD $input.path('$.vote') :inc\",\n    \"ExpressionAttributeValues\": {\n        \":inc\": {\n          \"N\": \"1\"\n        }\n    }\n}"
                        ]
                      ]
                    }
                  },
                  "uri": {
                    "Fn::Join": [
                      "",
                      [
                        "arn:aws:apigateway:",
                        {
                          "Ref": "AWS::Region"
                        },
                        ":dynamodb:action/UpdateItem"
                      ]
                    ]
                  },
                  "passthroughBehavior": "never",
                  "httpMethod": "POST",
                  "type": "aws"
                }
              }
            }
          },
          "definitions": {
            "Empty": {
              "type": "object",
              "title": "Empty Schema"
            },
            "Vote": {
              "type": "object",
              "required": ["vote"],
              "properties": {
                "vote": {
                  "type": "string",
                  "enum": ["a", "b"]
                }
              },
              "title": "Vote Schema"
            },
            "Results": {
              "type": "object",
              "properties": {
                "success": {
                  "type": "boolean"
                },
                "result": {
                  "type": "object",
                  "properties": {
                    "a": {
                      "type": "integer"
                    },
                    "b": {
                      "type": "integer"
                    }
                  }
                }
              },
              "title": "Results schema"
            }
          },
          "x-amazon-apigateway-request-validators": {
            "Validate body": {
              "validateRequestParameters": false,
              "validateRequestBody": true
            }
          },
          "x-amazon-apigateway-documentation": {
            "version": "1.0",
            "createdDate": "2018-03-18T15:36:41Z",
            "documentationParts": [
              {
                "location": {
                  "type": "API"
                },
                "properties": {
                  "description": "Voting api"
                }
              }
            ]
          }
        }
      }
    },
    "ApiGatewayAccount": {
      "Type": "AWS::ApiGateway::Account",
      "Properties": {
        "CloudWatchRoleArn": {
          "Fn::GetAtt": ["VoteAppApigwCwRole", "Arn"]
        }
      }
    },

    "ApiGatewayStage": {
      "DependsOn": ["ApiGatewayAccount"],
      "Type": "AWS::ApiGateway::Stage",
      "Properties": {
        "DeploymentId": { "Ref": "ApiDeployment" },
        "MethodSettings": [
          {
            "DataTraceEnabled": true,
            "HttpMethod": "*",
            "LoggingLevel": "INFO",
            "ResourcePath": "/*"
          }
        ],
        "RestApiId": { "Ref": "VoteAppApi" },
        "StageName": "LATEST"
      }
    },

    "ApiDeployment": {
      "Type": "AWS::ApiGateway::Deployment",
      "Properties": {
        "RestApiId": { "Ref": "VoteAppApi" },
        "StageName": "DemoStage"
      }
    }
  },

  "Outputs": {
    "TableName": {
      "Value": { "Ref": "VoteAppDynamoDBTable" },
      "Description": "Table name of the newly created DynamoDB table"
    },
    "RoleName": {
      "Value": { "Ref": "VoteAppApigwRole" },
      "Description": "Table name of the newly created IAM role"
    },
    "RootUrl": {
      "Description": "Root URL of the API gateway",
      "Value": {
        "Fn::Join": [
          "",
          [
            "https://",
            {
              "Ref": "VoteAppApi"
            },
            ".execute-api.",
            {
              "Ref": "AWS::Region"
            },
            ".amazonaws.com/DemoStage"
          ]
        ]
      }
    }
  }
}