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This app is integrated to WhatsApp, enabling you to chat with an LLM on Amazon Bedrock. Send voice notes and receive transcriptions. With just a small tweak in the code, you can send the transcription to the model too.

Your data will be securely stored in your AWS account and will not be shared or used for model training. It is not recommended to share private information because the security of data with WhatsApp is not guaranteed.

✅ AWS Level: Intermediate - 200

Prerequisites:

• AWS Account
• Foundational knowledge of Python

💰 Cost to complete:

• Amazon Bedrock Pricing
• Amazon Lambda Pricing
• Amazon Transcribe Pricing
• Amazon DynamoDB Pricing
• Amazon APIGateway Pricing
• Whatsapp pricing

1. WhatsApp receives the message: voice/text.
2. Amazon API Gateway receives the message from the WhatsApp webhook (previously authenticated).
3. Then, an AWS Lambda Functions named whatsapp_in processes the message and sends it to an Amazon DynamoDB table named whatsapp-metadata to store it.
4. The DynamoDB table whtsapp-metadata has a DynamoDB streaming configured, which triggers the process_stream Lambda Function.

process_stream Lambda Function sends the text of the message to the lambda function named langchain_agent_text (in the next step we will explore it).

1. The audio_job_transcriptor Lambda Function is triggered. This Lambda Function downloads the WhatsApp audio from the link in the message in an Amazon S3 bucket, using Whatsapp Token authentication, then converts the audio to text using the Amazon Transcribe start_transcription_job API, which leaves the transcript file in an Output Amazon S3 bucket.

Function that invokes audio_job_transcriptor looks like this:

def start_job_transciptor (jobName,s3Path_in,OutputKey,codec):
    response = transcribe_client.start_transcription_job(
            TranscriptionJobName=jobName,
            IdentifyLanguage=True,
            MediaFormat=codec,
            Media={
            'MediaFileUri': s3Path_in
            },
            OutputBucketName = BucketName,
            OutputKey=OutputKey 
            )

💡 Notice that the IdentifyLanguage parameter is configured to True. Amazon Transcribe can determine the primary language in the audio.

2. The transcriber_done Lambda Function is triggered with an Amazon S3 Event Notification put item once the Transcribe Job is complete. It extracts the transcript from the Output S3 bucket and sends it to whatsapp_out Lambda Function to respond to WhatsApp.

✅ You have the option to uncomment the code in the transcriber_done Lambda Function and send the voice note transcription to langchain_agent_text Lambda Function.

try:       
    response_3 = lambda_client.invoke(
        FunctionName = LAMBDA_AGENT_TEXT,
        InvocationType = 'Event' ,#'RequestResponse', 
        Payload = json.dumps({
            'whats_message': text,
            'whats_token': whats_token,
            'phone': phone,
            'phone_id': phone_id,
            'messages_id': messages_id

        })
    )

    print(f'\nRespuesta:{response_3}')

    return response_3
    
except ClientError as e:
    err = e.response
    error = err
    print(err.get("Error", {}).get("Code"))
    return f"Un error invocando {LAMBDA_AGENT_TEXT}

The agent receives the text and performs the following:

1. Queries the Amazon DynamoDB table called user_metadata to see if the session has expired. If it is active, it recovers the SessionID, necessary for the next step, if it expires it creates a new session timer.
2. Queries the Amazon DynamoDB table called session Table to see if there is any previous conversation history.
3. Consult the LLM through Amazon Bedrock using the following prompt:

The following is a friendly conversation between a human and an AI. 
    The AI is talkative and provides lots of specific details from its context. 
    If the AI does not know the answer to a question, it truthfully says it does not know.
    Always reply in the original user language.

    Current conversation:
    {history}

    Human:{input}

    Assistant:

4. Send the response to WhatsApp through whatsapp_out the Lambda Function.

💡 The phrase "Always reply in the original user language" ensures that it always responds in the original language and the multilingual capacity is provided by Anthropic Claude, which is the model used in this application.

1- Get Started with the New WhatsApp Business Platform

2- How To Generate a Permanent Access Token — WhatsApp API

3- Get started with the Messenger API for Instagram

✅ Clone the repo

git clone https://github.com/elizabethfuentes12/aws-private-assistant

✅ Go to:

cd private-assistant

In private_assistant_stack.py edit this line with the whatsapp Facebook Developer app number:

DISPLAY_PHONE_NUMBER = 'YOU-NUMBER'

This agent manages conversation memory, and you must set the session time here in this line:

if diferencia > 240: #session time in seg

Tip: Kenton Blacutt, an AWS Associate Cloud App Developer, collaborated with Langchain, creating the Amazon Dynamodb based memory class that allows us to store the history of a langchain agent in an Amazon DynamoDB.

• Configure the AWS Command Line Interface

• Deploy architecture with CDK Follow steps:

✅ Create The Virtual Environment: by following the steps in the README

python3 -m venv .venv

source .venv/bin/activate

for windows:

.venv\Scripts\activate.bat

✅ Install The Requirements:

pip install -r requirements.txt

✅ Synthesize The Cloudformation Template With The Following Command:

cdk synth

✅🚀 The Deployment:

cdk deploy

Edit WhatsApp configuration values in Facebook Developer in AWS Secrets Manager console.

✅ The verification token is any value, but it must be the same in step 3 and 4.

1. Go to Amazon API Gateway Console
2. Click on myapi.
3. Go to Stages -> prod -> /cloudapi -> GET, and copy Invoke URL.

4. Configure Webhook in the Facebook developer application.
   • Set Invoke URL.
   • Set verification token.

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See CONTRIBUTING for more information.

This library is licensed under the MIT-0 License. See the LICENSE file.