I am trying to set a cron task to read updates for a Facebook application. I have prompted the user to grant Offline Access permissions and i have store the session_key in the db.
I am crearing a new Facebook object and besides api and secret key I also use the session_key (previously stored in db) and the fb uid. When i am trying to create the auth token or do a API call i get a Error 104: Incorrect signature
Any ideas, experience, hints ?
I just wrote a blog entry about my search for something similar - need to write a Python cron script. Here's what I came up with:
#!/usr/bin/python
import os, sys, optparse, time, json
import facebook
##
USER_SESSION_FILE = os.path.expanduser('fb-user.session')
APP_KEY_FILE = os.path.expanduser('fb-app.keys')
##
def main():
app_keys = open(APP_KEY_FILE).readlines()
fb_api = facebook.Facebook(api_key=app_keys[0].strip(), secret_key=app_keys[1].strip())
opts, args = parse_options()
if args == ['init']:
init(fb_api)
return
session = json.load(open(USER_SESSION_FILE))
fb_api.uid = session['uid']
fb_api.secret = session['secret']
fb_api.session_key = session['session_key']
fb_api.stream.publish(message="test from PyFacebook")
def init(fb_api):
fb_api.auth.createToken()
sys.stdout.write('Opening web page to add application (press ENTER when done)...')
sys.stdout.flush()
fb_api.login()
raw_input()
sys.stdout.write('Asking for offline access now...')
sys.stdout.flush()
fb_api.request_extended_permission('offline_access')
raw_input()
sys.stdout.write('And, finally, asking for permission to publish')
sys.stdout.flush()
fb_api.request_extended_permission('publish_stream')
raw_input()
fb_api.auth.getSession()
if fb_api.session_key_expires != 0:
print """We were granted a temporary key; please wait a minute and run `%s init` again.""" % (sys.argv[0],)
else:
if not os.path.exists(USER_SESSION_FILE):
# Only set restrictive permissions when creating the file
# ourselves.
open(USER_SESSION_FILE, 'w').close()
os.chmod(USER_SESSION_FILE, 0600)
json.dump({
'uid': fb_api.uid,
'secret': fb_api.secret,
'session_key': fb_api.session_key,
},
open(USER_SESSION_FILE, 'w'),
sort_keys=True,
indent=4)
def parse_options():
p = optparse.OptionParser()
return p.parse_args()
if __name__ == '__main__':
sys.exit(main())
I faced the same problem where the error displayed was:
"facebook.FacebookError: Error 104: Incorrect signature"
Just reset your APP Secret_key and make corresponding change in the code and that sgould fix the problem.
Cheers!
I've never used PyFacebook. Or tried to resume sessions in this manner. But I'd imagine just storing session_key and uid is not enough. There are other params too, and a signature param that's calculated based on all the fb_* params. So you might need to store all of them.
But even so, they might only work for 20-30 minutes if you're unlucky.
