openapi.yaml

openapi: "3.0.1"
info:
  title:
    Ref: AWS::StackName
  description: REST API for Follower Count
paths:
  /{twitter_handle}:
    get:
      responses:
        200:
          description: "200 response"
          content:
            application/json:
              schema:
                $ref: "#/components/schemas/Empty"
      x-amazon-apigateway-integration:
        type: "aws"
        credentials:
          Fn::GetAtt: [RestAPIRole, Arn]
        uri: 
          Fn::Sub: "arn:aws:apigateway:${AWS::Region}:dynamodb:action/Query"
        responses:
          default:
            statusCode: "200"
            responseTemplates:
              application/json: |
                #set($inputRoot = $input.path('$'))
                {
                "twitter_handle": "$input.params('twitter_handle')",
                "Items": [#foreach($item in $inputRoot.Items){
                  "EpochTime": $item.EpochTime.N,
                  "followers": $item.followers.N
                }#if($foreach.hasNext),#end
                #end
                ],
                #if(!$inputRoot.LastEvaluatedKey.EpochTime.isEmpty())
                "LastEvaluatedKey": $inputRoot.LastEvaluatedKey.EpochTime.N,
                #end
                "ScannedCount": $inputRoot.ScannedCount
                }
        requestTemplates:
          application/json:
            Fn::Join:
              - ''
              - - >-
                  {"TableName": "
                - Ref: FollowerCount
                - >-
                  "
                - |
                  ,
                  #if(!$method.request.querystring.LastEvaluatedKey.isEmpty())
                  "ExclusiveStartKey": {"twitter_handle":{"S":"$input.params('twitter_handle')"}, "EpochTime":{"N":"$method.request.querystring.LastEvaluatedKey"}},
                  #end
                  "KeyConditionExpression": "twitter_handle = :twitter_handle",
                  "ExpressionAttributeValues": {
                      ":twitter_handle": {"S": "$input.params('twitter_handle')"}
                    }
                  }
        passthroughBehavior: "never"
        httpMethod: "POST"
components:
  schemas:
    Empty:
      type: object
      title: Empty Schema
      description: Empty Schema