Yammer REST API POST message to wall/feed
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Thread: Yammer REST API POST message to wall/feed

  1. #1
    Join Date
    Aug 2008
    Posts
    82

    Bearer token in the (OAuth) Authorization request header for REST API POST call

    Hey all i am trying to figure out how to do this OAuth authorization token for a REST API POST call.

    The documents state:
    With a valid access token, your app can make calls to any Yammer API endpoint by sending the access token as a “Bearer” token in the “Authorization” request header.

    GET /api/v1/messages/following.json HTTP/1.1
    Host: www.yammer.com
    Authorization: Bearer abcDefGhiFor

    more details on the “Bearer” token refer to [enter link description here][1]

    If the access token expires or the user de-authorizes your app, the API request will return an HTTP 401 with the following error in the body of the response.

    {
    "response": {
    "message": "Token not found.",
    "code": 16,
    "stat": "fail"
    }
    }

    Your app can request a new access token by re-running the appropriate flow if this error occurs.
    Currently my VB.net code is this:
    Code:
    Dim request As HttpWebRequest
    Dim response As HttpWebResponse = Nothing
    Dim reader As StreamReader
    Dim address As Uri
    Dim data As StringBuilder
    Dim byteData() As Byte
    Dim postStream As Stream = Nothing
    
    address = New Uri("https://www.yammer.com/api/v1/messages.json")
    request = DirectCast(WebRequest.Create(address), HttpWebRequest)
    
    request.Method = "POST"
    request.Headers("Authorization") = "Bearer " & yammerAPI.userToken'request.ContentType = "application/x-www-form-urlencoded" request.ContentType = "application/json" request.Host = "www.yammer.com"
    
    Dim body As String = "test"
    Dim replied_to_id As Integer = 123456789
    Dim group_id As Integer = 123456789
    
    data = New StringBuilder()
    'data.Append("&replied_to_id=" & HttpUtility.UrlEncode(replied_to_id))
    data.Append("group_id=" & HttpUtility.UrlEncode(group_id))
    data.Append("&body=" & HttpUtility.UrlEncode(body))
    
    byteData = UTF8Encoding.UTF8.GetBytes(data.ToString())
    request.ContentLength = byteData.Length
    
    Try
       postStream = request.GetRequestStream()
       postStream.Write(byteData, 0, byteData.Length)
    Finally
       If Not postStream Is Nothing Then postStream.Close()
    End Try
    
    Try
       response = DirectCast(request.GetResponse(), HttpWebResponse)
       reader = New StreamReader(response.GetResponseStream())
       Debug.Print(reader.ReadToEnd())
    Finally
       If Not response Is Nothing Then response.Close()
    End Try
    I keep getting an error of: The remote server returned an error: (401) Unauthorized.

    Any help would be great to understand this more!
    Last edited by StealthRT; August 30th, 2013 at 01:32 PM.

  2. #2
    Join Date
    Jul 2001
    Location
    Sunny South Africa
    Posts
    11,091

    Re: Yammer REST API POST message to wall/feed

    By your description ( and Yammer's ) it looks as if you are on the right track. Disclaimer: I never programmed with Yammer before, but things similar such as Google, Youtube, Facebook.

    Does Yammer have any SDKs on their "developer" site? This should have examples that make things easier

  3. #3
    Join Date
    Aug 2008
    Posts
    82

    Re: Yammer REST API POST message to wall/feed

    They dont have anything for VB.net. They only offer javascript, Python and Ruby.

  4. #4
    Join Date
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    Location
    Sunny South Africa
    Posts
    11,091

    Re: Yammer REST API POST message to wall/feed

    Maybe a silly question, but are you 100% that VB is indeed supported?

  5. #5
    Join Date
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    Location
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    Posts
    11,091

    Re: Yammer REST API POST message to wall/feed

    Another thought: Does your computer have a firewall that potentially blocks this?

  6. #6
    Join Date
    Aug 2008
    Posts
    82

    Re: Yammer REST API POST message to wall/feed

    VB is not supported.

    Dont know about the firewall but i am already able to get the access token via javascript so i am guessing no its not.

  7. #7
    Join Date
    Aug 2008
    Posts
    82

    Re: Yammer REST API POST message to wall/feed

    This is what i found on stackoverflow abou it:

    The Yammer API requires the OAuth data to be in the header. If you look at their example for Getting Data, you'll see the request looks like.

    GET /api/v1/messages/favorites_of/1234 HTTP/1.1 HOST: www.yammer.com

    Authorization: OAuth oauth_consumer_key="KsTROcNF1Fx3e1PwA",oauth_token="vlVH7A7DOm9wXuHdv58A",oauth_signature_method="PLAINTEXT",oauth_timestamp="1297383841092",oauth_nonce="1047685618",oauth_verifier="E4F8",oauth_signature="yPsEvDnNPIA8xGCFLvMJ73K0DD9ivMpATJeFOSo%26fSFh9UPkHQ6oRwK5OTne33ltnSnbQ9XrAhA72heg"

    The OAuth data is in the Authorization header and not in the URL. The only time you have any OAuth data in the URL is when you do the authorize.

  8. #8
    Join Date
    Jul 2001
    Location
    Sunny South Africa
    Posts
    11,091

    Re: Yammer REST API POST message to wall/feed

    I think, message them and ask if VB.NET ( or even the .NET Framework ) is supported. If they say yes, then we'll have to find the reason; if not, we have the reason.

    Sorry I couldn't be of more help

  9. #9
    Join Date
    Aug 2008
    Posts
    82

    Re: Yammer REST API POST message to wall/feed

    It can be used because there is a wrapper in .net already made (that i also cant understand how to start)

    https://yammersimpleapi.codeplex.com...ammerClient.cs

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