Invalid OAuth Signature Returned Using Yammer Api

Question

I am trying to write a small webapp that retrieves data from Yammer. I need to go through the Yammer OAuth bridge to access their data. I tried using the Oauth php library and doing a three-way handshake. But in the last step, I get an error: I have an invalid OAuth signature.

Here is the sequence of steps:

• The first part involves getting the URL of the request token, and these are the request parameters that I pass.

      [oauth_version] => 1.0
      [oauth_nonce] => 4e495b6a5864f5a0a51fecbca9bf3c4b
      [oauth_timestamp] => 1256105827
      [oauth_consumer_key] => my_consumer_key
      [oauth_signature_method] => HMAC-SHA1
      [oauth_signature] => FML2eacPNH6HIGxJXnhwQUHPeOY=
  

• Once this step is completed, I get the request token as follows:

  [oauth_token] => 6aMcbRK5wMqHgZQsdfsd [oauth_token_secret] => ro8AJxZ67sUDoiOTk8sl4V3js0uyof1uPJVB14asdfs [oauth_callback_confirmed] => true

• , url.It Yammer, Yammer.

• Yammer 4- , , . URL :

      [oauth_version] => 1.0
      [oauth_nonce] => 52b22495ecd9eba277c1ce6b97b00fdc
      [oauth_timestamp] => 1256106815
      [oauth_consumer_key] => myconsumerkey
      [callback_token] => 61A7
      [oauth_token] => 6aMcbRK5wMqHgZQsdfsd
      [oauth_token_secret] => ro8AJxZ67sUDoiOTk8sl4V3js0uyof1uPJVB14asdfs
      [oauth_callback_confirmed] => true
      [oauth_signature_method] => HMAC-SHA1
      [oauth_signature] => V9YcMDq2rP7OiZTK1k5kb/otMzA=
  

• Oauth, Oauth. , . . , ? , . java, signpost library . !

Answer 1

callback_token -, Yammer OAuth . OAuth 1.0a , oauth_verifier. , , Yammer , , .

, ​​ Yammer Development Network:

Yammer API API-. OAuth OAuth . , , , API , .

, Yammer OAuth, , . .

: python-yammer-oauth - , , Yammer .

Edit2: PLAINTEXT HMAC-SHA1? Yammer HMAC-SHA1.

Answer 2

PLAINTEXT.. " OAuth" .

, , HMAC-SHA1, API, . PLAINTEXT?

Answer 3

!

( "&" ) CONSUMER_SECRET. , ?