AWS Lambda to Amazon Comprehend using REST API

REST API backed by a Lambda function that invokes the Comprehend DetectSentiment API.

This sample project deploys an Amazon API Gateway REST API with an AWS Lambda integration.

The Lambda function is written in Python, calls the Amazon Comprehend DetectSentiment API, and returns a response containing the detected sentiment.

AWSTemplateFormatVersion: "2010-09-09"
Transform: AWS::Serverless-2016-10-31
Description: >
  (uksb-1tthgi812) (tag:apigw-lambda-comprehend-sam)
  sentiment-analysis

  Sample SAM template for sentiment analysis with AWS Lambda and Amazon Comprehend

# More info about Globals: https://github.com/awslabs/serverless-application-model/blob/master/docs/globals.rst
Globals:
  Function:
    Timeout: 5
    MemorySize: 256

Resources:
  DetectSentimentApi:
    Type: AWS::Serverless::Api
    Properties:
      StageName: dev

  DetectSentimentLambdaFunction:
    Type: AWS::Serverless::Function # More info about Function Resource: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#awsserverlessfunction
    Properties:
      CodeUri: src/
      Handler: app.lambda_handler
      Runtime: python3.9
      Architectures:
        - arm64
      Policies:
        - ComprehendBasicAccessPolicy: {}
      Events:
        SentimentAnalysis:
          Type: Api # More info about API Event Source: https://github.com/awslabs/serverless-application-model/blob/master/versions/2016-10-31.md#api
          Properties:
            Path: /detect_sentiment
            Method: post
            RestApiId:
              Ref: DetectSentimentApi

Outputs:
  SentimentAnalysisAPI:
    Description: "API Gateway endpoint URL for the dev stage of the Detect Sentiment API"
    Value: !Sub "https://${DetectSentimentApi}.execute-api.${AWS::Region}.amazonaws.com/dev/detect_sentiment/"