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Amazon API Gateway

Official Documentation

A simple API was defined in the API Gateway console. A set of resource endpoints where defined as follows:

  • GET /all/{caldate}
  • GET /humonly/{caldate}
  • GET /pressonly/{caldate}
  • GET /temponly/{caldate}

These are designated to return all data, humidity, pressure or temperature, on one specific day {caldate}

Note: When creating a resource endpoint, the console will prompt to see if CORS should be enabled. Selecting this will generate a matching OPTIONS endpoint with all necessary configuration. YOU WILL NEED THIS!

Method Request

The method executions are left as default as no special configuration is required

Integration Request

The integration requests ate configured to access DynamoDB directly. To do this, select:

  • Integration type - AWS Service
  • AWS S=service - DynamoDB
  • HTTP Method - POST
  • Action - Query
  • Execution role - You will need to define a role in IAM with the following policies AmazonAPIGatewayPushToCloudWatchLogs & AmazonDynamoDBReadOnlyAccess

Mapping Templates

A template needs to be defined. This is the query used to map data from DynamoDB to the response body. For example, to read humidy data, add a mapping for the application/json content type.

{
    "TableName": "aws-iot-java",
    "KeyConditionExpression": "caldate=:v1",
    "ExpressionAttributeValues": {
        ":v1": {"S": "$input.params('caldate')"}
    },
    "ProjectionExpression": "calminute,pihum0"
}

Integration Response

The integration response is left as default as no special configuration is required

Method Response

The method response is left as default as no special configuration is required

Authorizers

An authorizer is required for API Gateway calls. This should be configured to point to the User Pool you have defined in Cognito. Only users authorized there will be able to access the API.