in workmail-translate-email/src/app.py [0:0]
def translate_handler(event, context):
"""
Translate Email Content Using WorkMail Lambda Integration
Parameters
----------
email_summary: dict, required
Amazon WorkMail Message Summary Input Format
For more information, see https://docs.aws.amazon.com/workmail/latest/adminguide/lambda.html
{
"summaryVersion": "2019-07-28", # AWS WorkMail Message Summary Version
"envelope": {
"mailFrom" : {
"address" : "from@domain.test" # String containing from email address
},
"recipients" : [ # List of all recipient email addresses
{ "address" : "recipient1@domain.test" },
{ "address" : "recipient2@domain.test" }
]
},
"sender" : {
"address" : "sender@domain.test" # String containing sender email address
},
"subject" : "Hello From Amazon WorkMail!", # String containing email subject (Truncated to first 256 chars)"
"messageId": "00000000-0000-0000-0000-000000000000", # String containing message id for retrieval using workmail flow API
"invocationId": "00000000000000000000000000000000", # String containing the id of this lambda invocation. Useful for detecting retries and avoiding duplication
"flowDirection": "INBOUND", # String indicating direction of email flow. Value is either "INBOUND" or "OUTBOUND"
"truncated": false # boolean indicating if any field in message was truncated due to size limitations
}
context: object, required
Lambda Context runtime methods and attributes. See https://docs.aws.amazon.com/lambda/latest/dg/python-context-object.html
Returns
-------
Amazon WorkMail Sync Lambda Response Format
For more information, see https://docs.aws.amazon.com/workmail/latest/adminguide/lambda.html#synchronous-schema
return {
'actions': [ # Required, should contain at least 1 list element
{
'action' : { # Required
'type': 'string', # Required. Can be "BOUNCE", "DROP" or "DEFAULT"
'parameters': { <various> } # Optional. For bounce, <various> can be {"bounceMessage": "message that goes in bounce mail"}
},
'recipients': list of strings, # Optional. Indicates list of recipients for which this action applies
'default': boolean # Optional. Indicates whether this action applies to all recipients
}
]}
"""
logger.info(f"Received event: {event}")
message_id = event['messageId']
try:
# 1. Download email
downloaded_email = utils.download_email(message_id)
# 2. Detect email language
text_body = utils.extract_text_body(downloaded_email)
# Use first 100 characters of email body and email subject to detect email source language
email_language = translate_helper.detect_language(f"{event['subject']} {text_body[:100]}")
if email_language != utils.get_env_var('DESTINATION_LANGUAGE'):
# 3. Translate email
translated_email = utils.translate_email(downloaded_email, event['subject'], email_language, text_body)
# 4. Send translated email back to WorkMail
utils.update_workmail(message_id, translated_email)
else:
logger.info('Email is already in destination language')
except ClientError as e:
if e.response['Error']['Code'] == 'MessageFrozen':
# Redirect emails are not eligible for update, handle it gracefully.
logger.info(f"Message {message_id} is not eligible for update. This is usually the case for a redirected email")
else:
logger.error(e.response['Error']['Message'])
if e.response['Error']['Code'] == 'ResourceNotFoundException':
logger.error(f"Message {message_id} does not exist. Messages in transit are no longer accessible after 1 day")
elif e.response['Error']['Code'] == 'InvalidContentLocation':
logger.error('WorkMail could not access the updated email content. See https://docs.aws.amazon.com/workmail/latest/adminguide/update-with-lambda.html')
raise(e)
# Resume normal email flow
return {
'actions' : [{
'action' : {
'type' : 'DEFAULT'
},
'allRecipients': 'true'
}]
}