AWS Textract StartDocumentAnalysis function not publishing a message to the SNS Topic

Question

I am working with AWS Textract and I want to analyze a multipage document, therefore I have to use the async options, so I first used startDocumentAnalysisfunction and I got a JobId as the return, But it needs to trigger a function that I have set to trigger when the SNS topic got a message.

These are my serverless file and handler file.

provider:
  name: aws
  runtime: nodejs8.10
  stage: dev
  region: us-east-1
  iamRoleStatements:
    - Effect: "Allow"
      Action:
       - "s3:*"
      Resource: { "Fn::Join": ["", ["arn:aws:s3:::${self:custom.secrets.IMAGE_BUCKET_NAME}", "/*" ] ] }
    - Effect: "Allow"
      Action:
        - "sts:AssumeRole"
        - "SNS:Publish"
        - "lambda:InvokeFunction"
        - "textract:DetectDocumentText"
        - "textract:AnalyzeDocument"
        - "textract:StartDocumentAnalysis"
        - "textract:GetDocumentAnalysis"
      Resource: "*"

custom:
  secrets: ${file(secrets.${opt:stage, self:provider.stage}.yml)}

functions:
  routes:
    handler: src/functions/routes/handler.run
    events:
      - s3:
          bucket: ${self:custom.secrets.IMAGE_BUCKET_NAME}
          event: s3:ObjectCreated:*

  textract:
    handler: src/functions/routes/handler.detectTextAnalysis
    events:
      - sns: "TextractTopic"

resources:
  Resources:
    TextractTopic:
        Type: AWS::SNS::Topic
        Properties:
          DisplayName: "Start Textract API Response"
          TopicName: TextractResponseTopic

Handler.js

module.exports.run = async (event) => {
  const uploadedBucket = event.Records[0].s3.bucket.name;
  const uploadedObjetct = event.Records[0].s3.object.key;

  var params = {
    DocumentLocation: {
      S3Object: {
        Bucket: uploadedBucket,
        Name: uploadedObjetct
      }
    },
    FeatureTypes: [
      "TABLES", 
      "FORMS"
    ],
    NotificationChannel: {
      RoleArn: 'arn:aws:iam::<accont-id>:role/qvalia-ocr-solution-dev-us-east-1-lambdaRole', 
      SNSTopicArn: 'arn:aws:sns:us-east-1:<accont-id>:TextractTopic'
    }
  };

  let textractOutput = await new Promise((resolve, reject) => {
    textract.startDocumentAnalysis(params, function(err, data) {
      if (err) reject(err); 
      else resolve(data);
    });
  });
}

I manually published an sns message to the topic and then it is firing the textract lambda, which currently has this,

module.exports.detectTextAnalysis = async (event) => {
  console.log('SNS Topic isssss Generated');
  console.log(event.Records[0].Sns.Message);
};

What is the mistake that I have and why the textract startDocumentAnalysis is not publishing a message and making it trigger the lambda?

Note: I haven't use the startDocumentTextDetection before using the startTextAnalysis function, though it is not necessary to call it before this.

Answer 1

Make sure you have in your Trusted Relationships of the role you are using:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": [
          "lambda.amazonaws.com",
          "textract.amazonaws.com"
        ]
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

Answer 2

The SNS Topic name must be AmazonTextract

At the end your arn should look this:

arn:aws:sns:us-east-2:111111111111:AmazonTextract