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lambda_function.py
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lambda_function.py
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#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
##++++++ Amazon Lambda Function for processing WhatsApp incoming messages +++++
## Updated to Whatsapp API v14
#++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
import boto3
from boto3.dynamodb.types import TypeDeserializer
import decimal
import json
import os
import requests
from botocore.exceptions import ClientError
lambda_client = boto3.client('lambda')
from file_utils import( get_media_url )
from utils import (build_response)
SUPPORTED_FILE_TYPES = ['text/csv','image/png','image/jpeg','application/pdf']
def ddb_deserialize(r, type_deserializer = TypeDeserializer()):
return type_deserializer.deserialize({"M": r})
class DecimalEncoder(json.JSONEncoder):
def default(self, o):
if isinstance(o, decimal.Decimal):
if o % 1 > 0:
return float(o)
else:
return int(o)
return super(DecimalEncoder, self).default(o)
def lambda_handler(event, context):
print (event)
for rec in event['Records']:
try:
entry = json.loads(json.dumps(ddb_deserialize(rec['dynamodb']['NewImage']), cls=DecimalEncoder))
messages_id = entry["messages_id"]
event_name = rec['eventName']
print(event_name)
if event_name == "INSERT":
print("messages_id: ", messages_id)
print("entry: ",entry)
WHATS_TOKEN = entry["whats_token"]
for change in entry['changes']:
print("Iterating change")
print(change)
## Skipping as no contact info was relevant.
if('contacts' not in change['value']):
continue
whats_message = change['value']['messages'][0]
phone_id = change['value']['metadata']['phone_number_id']
name = change['value']['contacts'][0]['profile']['name']
phone = '+' + str(whats_message['from'])
channel = 'whatsapp'
##Define message type
messageType =whats_message['type']
if(messageType == 'text'):
message = whats_message['text']['body']
process_text(message, WHATS_TOKEN,phone,phone_id,messages_id)
# Agregar para respuestas a boton!
elif(messageType == 'button'):
message =whats_message['button']['text']
elif(messageType == 'audio'):
#processed_audio = process_audio(whats_message, WHATS_TOKEN,phone,systemNumber)
processed_job_audio = star_job_audio(whats_message, WHATS_TOKEN,phone,phone_id,messages_id)
message = "Procesando.."
else:
message = 'Attachment'
fileType = whats_message[messageType]['mime_type']
fileName = whats_message[messageType].get('filename',phone + '.'+fileType.split("/")[1])
fileId = whats_message[messageType]['id']
fileUrl = get_media_url(fileId,WHATS_TOKEN)
print(fileType)
print(message, messageType, name, phone_id)
print(build_response (200,json.dumps('All good!')))
else:
print("no New INSERT")
except:
print("no New Image")
return True
def process_text(whats_message, whats_token,phone,phone_id,messages_id):
print("text", whats_message, whats_token)
LAMBDA_AGENT_TEXT = os.environ['ENV_LAMBDA_AGENT_TEXT']
try:
response_3 = lambda_client.invoke(
FunctionName = LAMBDA_AGENT_TEXT,
InvocationType = 'Event' ,#'RequestResponse',
Payload = json.dumps({
'whats_message': whats_message,
'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}"
def star_job_audio(whats_message, whats_token,phone,phone_id,messages_id):
print("audio", whats_message, whats_token)
JOB_TRANSCRIPTOR_LAMBDA = os.environ['JOB_TRANSCRIPTOR_LAMBDA']
try:
response_2 = lambda_client.invoke(
FunctionName = JOB_TRANSCRIPTOR_LAMBDA,
InvocationType = 'Event' ,#'RequestResponse',
Payload = json.dumps({
'whats_message': whats_message,
'whats_token': whats_token,
'phone': phone,
'phone_id': phone_id,
'messages_id': messages_id
})
)
print(f'\nRespuesta:{response_2}')
return response_2
except ClientError as e:
err = e.response
error = err
print(err.get("Error", {}).get("Code"))
return f"Un error invocando {JOB_TRANSCRIPTOR_LAMBDA}"