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Ace:IMSPython

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Revision as of 18:15, 7 January 2011 by Toaster (talk | contribs)
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Using the python suds library it's fairly trivial to request tokens from the ACE IMS service.

Validating ace tokens is described in on the ims overview page and token store example page

Request One Token

from suds.client import Client

url='http://ims.umiacs.umd.edu:8080/ace-ims/IMSWebService?wsdl'
client = Client(url)
request = client.factory.create('tokenRequest')
request.hashValue = '4ed9ba3d9c7e3e092d0b0e3441f04574'
request.name = 'MyFile'

result = client.service.requestTokensImmediate('SHA-256-0',reqlist)
print result

Here's the result of running it:

[python] [toaster@loach ace-cli]$ python test2.py 
[(tokenResponse){
   digestService = "SHA-256"
   name = "somename"
   proofElements[] = 
      (proofElement){
         hashes[] = 
            "9129f93bc8ac2d93e35aa6206298fb8616690211a8563db51cf2ea1159682692",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "34bd07cc18a7ab1a47467081dcb21a6ca1857b1d3bdc12106ba2fd538b3bafbd",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "8a2042da9a114a41cf3738a841d65336af5b864ed6be8484c6bae4a4ac9e65a1",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "e95826668c3f301bef729e60157bbd3dbc346859ceee71655a9a065106276d72",
         index = 1
      },
   roundId = 2892850
   statusCode = 100
   timestamp = 2011-01-07 12:59:36.000013
   tokenClassName = "SHA-256-0"
 }]

Secure One File

Using hashlib, and binascii we can use python to both generate a digest and grab an ace token for that digest.

import hashlib
import binascii
from suds.client import Client

filename='test2.py'

digFile = open(filename,'rb')
hashAlg = hashlib.sha256()
hashAlg.update(digFile.read())
filedigest = binascii.b2a_hex(hashAlg.digest())

url='http://ims.umiacs.umd.edu:8080/ace-ims/IMSWebService?wsdl'
client = Client(url)

print  filename, ' ', filedigest

request = client.factory.create('tokenRequest')
request.hashValue = filedigest
request.name = filename

result = client.service.requestTokensImmediate('SHA-256-0',request)
print result

And the output:

[python] [toaster@loach ace-cli]$ python test2.py
test2.py   164182eef9792e2e1c5005cd9240ff508aef042b8fa344597431eae39370c784
[(tokenResponse){
   digestService = "SHA-256"
   name = "test2.py"
   proofElements[] = 
      (proofElement){
         hashes[] = 
            "c5e82872eeee3dfa539202a9757f8a5364b6fded4dfcb40b66084158f2b5c627",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "6e16a71847403f4e586625463160993bfab189c0bba771d81354c03d9c3591fd",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "0879b385c366d07142446a18dfb6d19c468a733991e9685fc75ce6f4b929b659",
         index = 0
      },
      (proofElement){
         hashes[] = 
            "e19dd18bd9eabf79a074d72231a7117bd2319a859d31a429575b4657e85d0c95",
         index = 1
      },
   roundId = 2893078
   statusCode = 100
   timestamp = 2011-01-07 13:08:27.000253
   tokenClassName = "SHA-256-0"
 }]

Bulk sending

Rather than sending one token per request, you should create batches to send. Just send a 'list' of tokenRequest objects to requestTokensImmediate. The IMS currently supports up to 10,000 tokens per request.

Round Requests