def redact_pii_documents_handler(event, context):
"""Redaction Lambda function handler."""
LOG.info('Received event with requestId: %s', event[REQUEST_ID])
LOG.debug(f'Raw event {event}')
InputEventValidator.validate(event)
invoke_args = json.loads(event[S3OL_CONFIGURATION][PAYLOAD]) if event[S3OL_CONFIGURATION][PAYLOAD] else {}
language_code = invoke_args.get(LANGUAGE_CODE, DEFAULT_LANGUAGE_CODE)
redaction_config = RedactionConfig(**invoke_args)
object_get_context = event[GET_OBJECT_CONTEXT]
s3ol_access_point = event[S3OL_CONFIGURATION][S3OL_ACCESS_POINT_ARN]
s3 = S3Client(s3ol_access_point)
cloud_watch = CloudWatchClient()
comprehend = ComprehendClient(s3ol_access_point=s3ol_access_point, session_id=event[REQUEST_ID], user_agent=DEFAULT_USER_AGENT,
endpoint_url=COMPREHEND_ENDPOINT_URL)
exception_handler = ExceptionHandler(s3)
LOG.debug("Pii Entity Types to be redacted:" + str(redaction_config.pii_entity_types))
processed_document = False
document = Document('')
try:
def time_bound_task():
nonlocal processed_document
nonlocal document
PartialObjectRequestValidator.validate(event)
pii_classification_segmenter = Segmenter(DOCUMENT_MAX_SIZE_CONTAINS_PII_ENTITIES)
pii_redaction_segmenter = Segmenter(DOCUMENT_MAX_SIZE_DETECT_PII_ENTITIES)
redactor = Redactor(redaction_config)
time1 = time.time()
text, http_headers, status_code = s3.download_file_from_presigned_url(object_get_context[INPUT_S3_URL],
event[USER_REQUEST][HEADERS])
time2 = time.time()
LOG.info(f"Downloaded the file in : {(time2 - time1)} seconds")
document = redact(text, pii_classification_segmenter, pii_redaction_segmenter, redactor,
comprehend, redaction_config, language_code)
processed_document = True
time1 = time.time()
LOG.info(f"Pii redaction completed within {(time1 - time2)} seconds. Returning back the response to S3")
redacted_text_bytes = document.redacted_text.encode('utf-8')
http_headers[CONTENT_LENGTH] = len(redacted_text_bytes)
s3.respond_back_with_data(redacted_text_bytes, http_headers, object_get_context[REQUEST_ROUTE],
object_get_context[REQUEST_TOKEN], status_code)
execute_task_with_timeout(context.get_remaining_time_in_millis() - RESERVED_TIME_FOR_CLEANUP, time_bound_task)
except Exception as generated_exception:
exception_handler.handle_exception(generated_exception, object_get_context[REQUEST_ROUTE], object_get_context[REQUEST_TOKEN])
finally:
if PUBLISH_CLOUD_WATCH_METRICS:
pii_entities = get_interested_pii(document, redaction_config)
publish_metrics(cloud_watch, s3, comprehend, processed_document, len(pii_entities) > 0, language_code,
s3ol_access_point, pii_entities)
LOG.info("Responded back to s3 successfully")
def test_input_event_validation_invalid_payload(self):
with self.assertRaises(InvalidConfigurationException) as context:
invalid_event = deepcopy(self.sample_event)
invalid_event[S3OL_CONFIGURATION][PAYLOAD] = "Invalid json"
InputEventValidator.validate(invalid_event)
def test_input_event_validation_empty_payload(self):
invalid_event = deepcopy(self.sample_event)
invalid_event[S3OL_CONFIGURATION][PAYLOAD] = ""
InputEventValidator.validate(invalid_event)
def test_input_event_validation_missing_payload(self):
with self.assertRaises(AssertionError) as context:
invalid_event = deepcopy(self.sample_event)
del invalid_event[S3OL_CONFIGURATION][PAYLOAD]
InputEventValidator.validate(invalid_event)
def test_input_event_validation_missing_input_s3_url(self):
with self.assertRaises(AssertionError) as context:
invalid_event = deepcopy(self.sample_event)
del invalid_event[GET_OBJECT_CONTEXT][INPUT_S3_URL]
InputEventValidator.validate(invalid_event)
def test_input_event_validation_missing_request_id(self):
with self.assertRaises(AssertionError) as context:
invalid_event = deepcopy(self.sample_event)
del invalid_event[REQUEST_ID]
InputEventValidator.validate(invalid_event)
def test_input_event_validation_missing_request_route(self):
with self.assertRaises(AssertionError) as context:
invalid_event = deepcopy(self.sample_event)
del invalid_event[GET_OBJECT_CONTEXT][REQUEST_ROUTE]
InputEventValidator.validate(invalid_event)
def test_input_event_validation_empty_input(self):
with self.assertRaises(AssertionError) as context:
InputEventValidator.validate({})