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regluit/payment/amazon.py

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from regluit.payment.parameters import *
from django.core.urlresolvers import reverse
from django.conf import settings
from regluit.payment.models import Transaction, PaymentResponse
from boto.fps.connection import FPSConnection
from django.http import HttpResponse, HttpRequest, HttpResponseRedirect, HttpResponseBadRequest, HttpResponseForbidden
from datetime import timedelta
from regluit.utils.localdatetime import now, zuluformat
from boto import handler
from boto.resultset import ResultSet
from boto.exception import FPSResponseError
import xml.sax
import traceback
import datetime
import logging
import urlparse
import time
import urllib
logger = logging.getLogger(__name__)
AMAZON_STATUS_SUCCESS_ABT = 'SA'
AMAZON_STATUS_SUCCESS_ACH = 'SB'
AMAZON_STATUS_SUCCESS_CREDIT = 'SC'
AMAZON_STATUS_ERROR = 'SE'
AMAZON_STATUS_ADBANDONED = 'A'
AMAZON_STATUS_EXCEPTION = 'CE'
AMAZON_STATUS_PAYMENT_MISMATCH = 'PE'
AMAZON_STATUS_INCOMPLETE = 'NP'
AMAZON_STATUS_NOT_REGISTERED = 'NM'
AMAZON_STATUS_CANCELED = 'Canceled'
AMAZON_STATUS_FAILURE = 'Failure'
AMAZON_STATUS_PENDING = 'Pending'
AMAZON_STATUS_RESERVED = 'Reserved'
AMAZON_STATUS_SUCCESS = 'Success'
AMAZON_IPN_STATUS_CANCELED = 'CANCELED'
AMAZON_IPN_STATUS_FAILURE = 'FAILURE'
AMAZON_IPN_STATUS_PENDING = 'PENDING'
AMAZON_IPN_STATUS_RESERVED = 'RESERVED'
AMAZON_IPN_STATUS_SUCCESS = 'SUCCESS'
AMAZON_NOTIFICATION_TYPE_STATUS = 'TransactionStatus'
AMAZON_NOTIFICATION_TYPE_CANCEL = 'TokenCancellation'
AMAZON_OPERATION_TYPE_PAY = 'PAY'
AMAZON_OPERATION_TYPE_REFUND = 'REFUND'
AMAZON_OPERATION_TYPE_CANCEL = 'CANCEL'
# load FPS_ACCESS_KEY and FPS_SECRET_KEY from the database if possible
try:
from regluit.core.models import Key
FPS_ACCESS_KEY = Key.objects.get(name="FPS_ACCESS_KEY").value
FPS_SECRET_KEY = Key.objects.get(name="FPS_SECRET_KEY").value
logger.info('Successful loading of FPS_*_KEYs')
except Exception, e:
logger.info('EXCEPTION: unsuccessful loading of FPS_*_KEYs: {0}'.format(e))
def get_ipn_url():
if settings.IPN_SECURE_URL:
return settings.BASE_URL_SECURE + reverse('HandleIPN', args=["amazon"])
else:
return settings.BASE_URL + reverse('HandleIPN', args=["amazon"])
def ProcessIPN(request):
'''
IPN handler for amazon. Here is a litle background on amazon IPNS
http://docs.amazonwebservices.com/AmazonFPS/latest/FPSAdvancedGuide/APPNDX_IPN.html
notificationType: Can either be TransactionStatus of TokenCancellation
status: One of the defined IPN status codes
operation: The type of operation
callerReference: The reference to find the transaction
The IPN is called for the following cases:
A payment or reserve succeeds
A payment or reserve fails
A payment or reserve goes into a pending state
A reserved payment is settled successfully
A reserved payment is not settled successfully
A refund succeeds
A refund fails
A refund goes into a pending state
A payment is canceled
A reserve is canceled
A token is canceled successfully
'''
try:
logging.debug("Amazon IPN called")
logging.debug(request.POST)
uri = request.build_absolute_uri()
parsed_url = urlparse.urlparse(uri)
connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
# Check the validity of the IPN
resp = connection.verify_signature("%s://%s%s" %(parsed_url.scheme,
parsed_url.netloc,
parsed_url.path),
request.raw_post_data)
if not resp[0].VerificationStatus == "Success":
# Error, ignore this IPN
logging.error("Amazon IPN cannot be verified with post data: ")
logging.error(request.raw_post_data)
return HttpResponseForbidden()
logging.debug("Amazon IPN post data:")
logging.debug(request.POST)
reference = request.POST['callerReference']
type = request.POST['notificationType']
# In the case of cancelling a token, there is no transaction, so this info is not set
transactionId = request.POST.get('transactionId', None)
date = request.POST.get('transactionDate', None)
operation = request.POST.get('operation', None)
status = request.POST.get('transactionStatus', None)
logging.info("Received Amazon IPN with the following data:")
logging.info("type = %s" % type)
logging.info("operation = %s" % operation)
logging.info("reference = %s" % reference)
logging.info("status = %s" % status)
# We should always find the transaction by the token
transaction = Transaction.objects.get(secret=reference)
if type == AMAZON_NOTIFICATION_TYPE_STATUS:
# status update for the token, save the actual value
transaction.local_status = status
# Now map our local status to the global status codes
if operation == AMAZON_OPERATION_TYPE_PAY:
if status == AMAZON_IPN_STATUS_SUCCESS:
transaction.status = TRANSACTION_STATUS_COMPLETE
elif status == AMAZON_IPN_STATUS_PENDING:
if transaction.status == TRANSACTION_STATUS_CREATED:
#
# Per the amazon documentation:
# If your IPN receiving service is down for some time, it is possible that our retry mechanism will deliver the IPNs out of order.
# If you receive an IPN for TransactionStatus (IPN), as SUCCESS or FAILURE or RESERVED,
# then after that time ignore any IPN that gives the PENDING status for the transaction
#
transaction.status = TRANSACTION_STATUS_PENDING
else:
transaction.status = TRANSACTION_STATUS_ERROR
elif operation == AMAZON_OPERATION_TYPE_REFUND:
if status == AMAZON_IPN_STATUS_SUCCESS:
transaction.status = TRANSACTION_STATUS_REFUNDED
elif status == AMAZON_IPN_STATUS_PENDING:
transaction.status = TRANSACTION_STATUS_PENDING
else:
transaction.status = TRANSACTION_STATUS_ERROR
elif operation == AMAZON_OPERATION_TYPE_CANCEL:
if status == AMAZON_IPN_STATUS_SUCCESS:
transaction.status = TRANSACTION_STATUS_COMPLETE
else:
transaction.status = TRANSACTION_STATUS_ERROR
elif type == AMAZON_NOTIFICATION_TYPE_CANCEL:
#
# The cancel IPN does not have a transaction ID or transaction status, so make them up
#
transaction.local_status = AMAZON_IPN_STATUS_CANCELED
transaction.status = TRANSACTION_STATUS_CANCELED
status = AMAZON_IPN_STATUS_CANCELED
transaction.save()
#
# This is currently not done in paypal land, but log this IPN since the amazon IPN has good info
#
PaymentResponse.objects.create(api="IPN",
correlation_id = transactionId,
timestamp = date,
info = str(request.POST),
status=status,
transaction=transaction)
return HttpResponse("Complete")
except:
traceback.print_exc()
return HttpResponseForbidden()
def amazonPaymentReturn(request):
'''
This is the complete view called after the co-branded API completes. It is called whenever the user
approves a preapproval or a pledge. This URL is set via the PAY api.
'''
try:
# pick up all get and post parameters and display
output = "payment complete"
output += request.method + "\n" + str(request.REQUEST.items())
signature = request.GET['signature']
status = request.GET['status']
reference = request.GET['callerReference']
token = request.GET['tokenID']
# BUGUBG - Should we verify the signature here?
#
# Find the transaction by reference, there should only be one
# We will catch the exception if it does not exist
#
transaction = Transaction.objects.get(secret=reference)
logging.info("Amazon Co-branded Return URL called for transaction id: %d" % transaction.id)
logging.info(request.GET)
#
# BUGBUG, for now lets map amazon status code to paypal, just to keep things uninform
#
if transaction.type == PAYMENT_TYPE_INSTANT:
# Instant payments need to be executed now
# Log the authorize transaction
r = PaymentResponse.objects.create(api="Authorize",
correlation_id = "None",
timestamp = str(datetime.datetime.now()),
info = str(request.GET),
status=status,
transaction=transaction)
if status == AMAZON_STATUS_SUCCESS_ABT or status == AMAZON_STATUS_SUCCESS_ACH or status == AMAZON_STATUS_SUCCESS_CREDIT:
# The above status code are unique to the return URL and are different than the pay API codes
# Store the token, we need this for the IPN.
transaction.pay_key = token
#
# BUGBUG, need to handle multiple recipients
# Send the pay request now to ourselves
#
e = Execute(transaction=transaction)
if e.success() and not e.error():
# Success case, save the ID. Our IPN will update the status
print "Amazon Execute returned succesfully"
else:
logging.error("Amazon payment execution failed: ")
logging.error(e.envelope())
transaction.status = TRANSACTION_STATUS_ERROR
# Log the pay transaction
r = PaymentResponse.objects.create(api="Pay",
correlation_id = e.correlation_id(),
timestamp = e.timestamp(),
info = e.envelope(),
status = e.status,
transaction=transaction)
else:
# We may never see an IPN, set the status here
logging.error("Amazon payment authorization failed: ")
logging.error(request.GET)
transaction.status = AMAZON_STATUS_FAILURE
elif transaction.type == PAYMENT_TYPE_AUTHORIZATION:
#
# Future payments, we only need to store the token. The authorization was requested with the default expiration
# date set in our settings. When we are ready, we can call execute on this
#
transaction.local_status = status
if status == AMAZON_STATUS_SUCCESS_ABT or status == AMAZON_STATUS_SUCCESS_ACH or status == AMAZON_STATUS_SUCCESS_CREDIT:
# The above status code are unique to the return URL and are different than the pay API codes
transaction.status = TRANSACTION_STATUS_ACTIVE
transaction.approved = True
transaction.pay_key = token
else:
# We may never see an IPN, set the status here
transaction.status = TRANSACTION_STATUS_ERROR
# Log the trasaction
r = PaymentResponse.objects.create(api="Authorize",
correlation_id = "None",
timestamp = str(datetime.datetime.now()),
info = str(request.GET),
status = status,
transaction=transaction)
transaction.save()
# Redirect to our pledge success URL
return_path = "{0}?{1}".format(reverse('pledge_complete'),
urllib.urlencode({'tid':transaction.id}))
return_url = urlparse.urljoin(settings.BASE_URL, return_path)
return HttpResponseRedirect(return_url)
except:
logging.error("Amazon co-branded return-url FAILED with exception:")
traceback.print_exc()
# BUGBUG: check to see whether status is AMAZON_STATUS_ADBANDONED
# if so, ultimately figure out the campaign whose transaction is being canceled out.
# for the moment, return the user to BASE_URL
if request.REQUEST.get("status") == AMAZON_STATUS_ADBANDONED:
return HttpResponseRedirect(settings.BASE_URL)
try:
cancel_path = "{0}?{1}".format(reverse('pledge_cancel'),
urllib.urlencode({'tid':transaction.id}))
cancel_url = urlparse.urljoin(settings.BASE_URL, cancel_path)
return HttpResponseRedirect(cancel_url)
except Exception, e:
# BUGBUG -- we should find a better place to send user...but back to front page is ok for now.
logging.error("Amazon co-branded return-url FAILED with exception: {0}".format(e))
return HttpResponseRedirect(settings.BASE_URL)
class AmazonRequest:
'''
Handles common information that is processed from the response envelope of the amazon request.
'''
# Global values for the class
response = None
raw_response = None
errorMessage = None
status = None
url = None
def ack( self ):
return None
def success(self):
if self.errorMessage:
return False
else:
return True
def error(self):
if self.errorMessage:
return True
else:
return False
def error_data(self):
return None
def error_id(self):
return None
def error_string(self):
return self.errorMessage
def envelope(self):
# The envelope is used to store info about this request
if self.response:
return str(self.response)
else:
return None
def correlation_id(self):
# The correlation ID is unique to each API call
if self.response:
return self.response.TransactionId
else:
return None
def timestamp(self):
return str(datetime.datetime.now())
class Pay( AmazonRequest ):
'''
The pay function generates a redirect URL to approve the transaction
'''
def __init__( self, transaction, return_url=None, cancel_url=None, amount=None, paymentReason=""):
try:
logging.debug("Amazon PAY operation for transaction ID %d" % transaction.id)
# Replace our return URL with a redirect through our internal URL
self.original_return_url = return_url
return_url = settings.BASE_URL + reverse('AmazonPaymentReturn')
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
receiver_list = []
receivers = transaction.receiver_set.all()
if not amount:
amount = 0
for r in receivers:
amount += r.amount
logger.info(receiver_list)
# Data fields for amazon
expiry = now() + timedelta( days=settings.PREAPPROVAL_PERIOD )
data = {
'amountType':'Maximum', # The transaction amount is the maximum amount
'callerReference': transaction.secret,
'currencyCode': 'USD',
'globalAmountLimit': str(amount),
'validityExpiry': str(int(time.mktime(expiry.timetuple()))), # use the preapproval date by default
}
self.url = self.connection.make_url(return_url, paymentReason, "MultiUse", str(amount), **data)
logging.debug("Amazon PAY redirect url was: %s" % self.url)
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon PAY api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
logging.error("Amazon PAY FAILED with exception:")
traceback.print_exc()
self.errorMessage = "Error: Server Error"
def api(self):
return "Amazon Co-branded PAY request"
def exec_status( self ):
return None
def amount( self ):
return None
def key( self ):
return None
def next_url( self ):
return self.url
def embedded_url(self):
return None
class Preapproval(Pay):
def __init__( self, transaction, amount, expiry=None, return_url=None, cancel_url=None, paymentReason=""):
# set the expiration date for the preapproval if not passed in. This is what the paypal library does
now_val = now()
if expiry is None:
expiry = now_val + timedelta( days=settings.PREAPPROVAL_PERIOD )
transaction.date_authorized = now_val
transaction.date_expired = expiry
transaction.save()
# Call into our parent class
Pay.__init__(self, transaction, return_url=return_url, cancel_url=cancel_url, amount=amount, paymentReason=paymentReason)
class Execute(AmazonRequest):
'''
The Execute function sends an existing token(generated via the URL from the pay operation), and collects
the money.
'''
def __init__(self, transaction=None):
try:
logging.debug("Amazon EXECUTE action for transaction id: %d" % transaction.id)
# Use the boto class top open a connection
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
self.transaction = transaction
# BUGBUG, handle multiple receivers! For now we just send the money to ourselves
global_params = {"OverrideIPNURL": get_ipn_url()}
self.raw_response = self.connection.pay(transaction.amount,
transaction.pay_key,
recipientTokenId=None,
callerReference=transaction.secret,
senderReference=None,
recipientReference=None,
senderDescription=None,
recipientDescription=None,
callerDescription=None,
metadata=None,
transactionDate=None,
reserve=False,
extra_params=global_params)
#
# BUGBUG:
# The boto FPS library throws an exception if an error is generated, we need to do a better
# job of reporting the error when this occurs
#
self.response = self.raw_response[0]
logging.debug("Amazon EXECUTE response for transaction id: %d" % transaction.id)
logging.debug(str(self.response))
self.status = self.response.TransactionStatus
#
# For amazon, the transactionID is per transaction, not per receiver. For now we will store it in the preapproval key field
# so we can use it to refund or get status later
#
transaction.preapproval_key = self.response.TransactionId
logging.debug("Amazon EXECUTE API returning with variables:")
logging.debug(locals())
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon EXECUTE api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
logging.error("Amazon EXECUTE FAILED with exception:")
traceback.print_exc()
self.errorMessage = "Error: Server Error"
def api(self):
return "Amazon API Pay"
def key(self):
# IN paypal land, our key is updated from a preapproval to a pay key here, just return the existing key
return self.transaction.pay_key
class Finish(AmazonRequest):
'''
The Finish function handles the secondary receiver in a chained payment. Currently not implemented
for amazon
'''
def __init__(self, transaction):
try:
print "Finish"
except:
traceback.print_exc()
self.errorMessage = "Error: Server Error"
class PaymentDetails(AmazonRequest):
'''
Get details about executed PAY operation
This api must set the following class variables to work with the code in manager.py
status - one of the global transaction status codes
transactions -- Not supported for amazon, used by paypal
'''
def __init__(self, transaction=None):
try:
logging.debug("Amazon PAYMENTDETAILS API for transaction id: %d" % transaction.id)
# Use the boto class top open a connection
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
self.transaction = transaction
if not transaction.preapproval_key:
# This is where we store the transaction ID
self.errorMessage = "No Valid Transaction ID"
return
#
# We need to reference the transaction ID here, this is stored in the preapproval_key as this
# field is not used for amazon
#
self.raw_response = self.connection.get_transaction_status(transaction.preapproval_key)
self.response = self.raw_response[0]
logging.debug("Amazon PAYMENTDETAILS API for transaction id: %d returned response:")
logging.debug(self.response)
#
# Now we need to build values to match the paypal response.
# The two we need are status and and array of transactions.
#
# Check our status codes, note that these are different than the IPN status codes
self.local_status = self.response.StatusCode
self.message = self.response.StatusMessage
if self.local_status == 'Canceled':
self.status = TRANSACTION_STATUS_CANCELED
elif self.local_status == 'Success':
#
# Note, there is a limitation here. If the current status is refunded, this API will return "Success".
# We must be careful to not overwrite refunded status codes. There is no way that I can find to poll
# to see if a transaction is refunded. I need to investigate all of the data fields and see if we can find
# that information
#
if transaction.status != TRANSACTION_STATUS_REFUNDED:
self.status = TRANSACTION_STATUS_COMPLETE
else:
self.status = TRANSACTION_STATUS_REFUNDED
elif self.local_status == 'PendingNetworkResponse' or self.local_status == 'PendingVerification':
self.status = TRANSACTION_STATUS_PENDING
elif self.local_status == 'TransactionDenied':
self.status = TRANSACTION_STATUS_FAILED
else:
self.status = TRANSACTION_STATUS_ERROR
# Amazon does not support receivers at this point
self.transactions = []
logging.debug("Amazon PAYMENTDETAILS API returning with variables:")
logging.debug(locals())
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon PAYMENTDETAILS api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
logging.error("Amazon PAYMENTDETAILS FAILED with exception:")
self.errorMessage = "Error: ServerError"
traceback.print_exc()
class CancelPreapproval(AmazonRequest):
'''
Cancels an exisiting token. The current boto FPS library does not directly support
the CancelToken API, just the Cancel API(for real money in-flight or reserved).
'''
def __init__(self, transaction):
try:
logging.debug("Amazon CANCELPREAPPROVAL api called for transaction id: %d" % transaction.id)
# Use the boto class top open a connection
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
self.transaction = transaction
global_params = {"OverrideIPNURL": get_ipn_url()}
params = global_params
params['TokenId'] = transaction.pay_key
params['ReasonText'] = "Cancel Reason"
fps_response = self.connection.make_request("CancelToken", params)
body = fps_response.read()
if(fps_response.status == 200):
rs = ResultSet()
h = handler.XmlHandler(rs, self)
xml.sax.parseString(body, h)
if rs:
self.raw_response = rs
self.response = self.raw_response[0]
self.status = self.response.TransactionStatus
self.errorMessage = None
else:
#
# Set an error message and failure status for
# our success() and error() functions
#
self.status = AMAZON_STATUS_FAILURE
self.errorMessage = "%s - %s" % (fps_response.reason, body)
logging.debug("Amazon CANCELPREAPPROVAL API returning with variables:")
logging.debug(locals())
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon CANCELPREAPPROVAL api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
logging.error("Amazon CANCELPREAPPROVAL FAILED with exception:")
traceback.print_exc()
self.errorMessage = "Error: Server Error"
class RefundPayment(AmazonRequest):
def __init__(self, transaction):
try:
logging.debug("Amazon REFUNDPAYMENT API called for transaction id: %d", transaction.id)
# Use the boto class top open a connection
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
self.transaction = transaction
if not transaction.preapproval_key:
# This is where we store the transaction ID
self.errorMessage = "No Valid Transaction ID"
return
#
# We need to reference the transaction ID here, this is stored in the preapproval_key as this
# field is not used for amazon
#
global_params = {"OverrideIPNURL": get_ipn_url()}
self.raw_response = self.connection.refund(transaction.secret, transaction.preapproval_key, extra_params=global_params)
self.response = self.raw_response[0]
logging.debug("Amazon REFUNDPAYMENT response was:")
logging.debug(str(self.response))
self.status = self.response.TransactionStatus
logging.debug("Amazon REFUNDPAYMENT API returning with variables:")
logging.debug(locals())
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon REFUNDPAYMENT api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
logging.error("Amazon REFUNDPAYMENT FAILED with exception:")
traceback.print_exc()
self.errorMessage = "Error: Server Error"
class PreapprovalDetails(AmazonRequest):
'''
Get details about an authorized token
This api must set 4 different class variables to work with the code in manager.py
status - one of the global transaction status codes
approved - boolean value
currency - not used in this API, but we can get some more info via other APIs - TODO
amount - not used in this API, but we can get some more info via other APIs - TODO
'''
def __init__(self, transaction=None):
try:
logging.debug("Amazon PREAPPROVALDETAILS API called for transaction id: %d", transaction.id)
# Use the boto class top open a connection
self.connection = FPSConnection(FPS_ACCESS_KEY, FPS_SECRET_KEY, host=settings.AMAZON_FPS_HOST)
self.transaction = transaction
#
# We need to reference the caller reference here, we may not have a token if the return URL failed
#
self.raw_response = self.connection.get_token_by_caller_reference(transaction.secret)
self.response = self.raw_response
logging.debug("Amazon PREAPPROVALDETAILS response:")
logging.debug(str(self.response))
#
# Look for a token, we store this in the pay_key field
#
self.pay_key = self.response.TokenId
self.local_status = self.response.TokenStatus
# Possible status for the Token object are Active and Inactive
if self.local_status == 'Active':
self.status = TRANSACTION_STATUS_ACTIVE
self.approved = True
else:
# It is not clear here if this should be failed or cancelled, but we have no way to know
# the token is only active or now, so we will assume it is canceled.
self.status = TRANSACTION_STATUS_CANCELED
self.approved = False
# Set the other fields that are expected. We don't have values for these now, so just copy the transaction
self.currency = transaction.currency
self.amount = transaction.amount
logging.debug("Amazon PREAPPROVALDETAILS API returning with variables:")
logging.debug(locals())
except FPSResponseError as (responseStatus, responseReason, body):
logging.error("Amazon PREAPPROVALDETAILS api failed with status: %s, reason: %s and data:" % (responseStatus, responseReason))
logging.error(body)
self.errorMessage = body
except:
# If the boto API fails, it also throws an exception and we end up here
logging.error("Amazon PREAPPROVALDETAILS FAILED with exception:")
self.errorMessage = "Error: ServerError"
traceback.print_exc()
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