Unable to access AWS Lex From Lambda

Question

I am trying to access amazon lex from a lambda function. Lambda function sends the input message from the chat bot to lex. When I try to send the text,it is giving me an error.

errorMessage: "An error occurred (AccessDeniedException) when calling the RecognizeText operation: User: arn:aws:sts::524709025091:assumed-role/LF0-role-0nuz6ho1/LF0 is not authorized to perform: lex:RecognizeText on resource: arn:aws:lex:us-east-1:524709025091:bot-alias/1TN1TWNYYG/TSTALIASID because no identity-based policy allows the lex:RecognizeText action"
errorType: "AccessDeniedException"
requestId: "45ee975b-ecfa-4823-837b-790cdd908a5b"

The code in my lambda function:

import json
import random
import boto3


def lambda_handler(event, context):
    responsemsg = ''
    for msg in event['messages']:
        responsemsg += msg['unstructured']['text']
    session = boto3.Session()
    client = boto3.client('lexv2-runtime')
    response = client.recognize_text(
    botId='****',
    botAliasId='****',
    localeId='en_US',
    sessionId="test_session",
    text='hi')
    
    
    return response

score 1 · Answer 1 · answered Feb 26 '22 at 19:05

User: arn:aws:sts::524709025091:assumed-role/LF0-role-0nuz6ho1/LF0 is not authorized to perform: lex:RecognizeText

This means that the role that your Lambda is assuming for execution, does not have permission to perform lex:RecognizeText.

You can either:

Create an inline policy granting access to lex:RecogniseText on the Lambda execution role
Attach the AWS managed AmazonLexRunBotsOnly policy to the role, if you also require access to other common Lex APIs

Unable to access AWS Lex From Lambda

1 Answers1