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(Visual Basic 6.0) Twitter - Application Only Authentication

Demonstrates how to get a Twitter OAuth2 token for application-only authentication.

This allows you to issue authenticated requests on behalf of the application itself (as opposed to on behalf of a specific user). You don’t have the context of an authenticated user and this means that any request to API for endpoints that require user context, such as posting Tweets, will not work. However, the set of endpoints that will still be available can have a higher rate limit.

Your app will be able to, for example:

  • Pull user timelines;
  • Access friends and followers of any account;
  • Access lists resources;
  • Search in Tweets;
  • Retrieve any user information;

And it will not be able to:

  • Post Tweets or other resources;
  • Connect to Streaming endpoints;
  • Search for users;
  • Use any geo endpoint;
  • Access Direct Messages or account credentials;

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' It requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' Note: Define your Twitter apps at https://apps.twitter.com/

' We're going to send an HTTPS POST that looks like this:

' POST /oauth2/token HTTP/1.1
' Host: api.twitter.com
' User-Agent: My Twitter App v1.0.23
' Authorization: Basic eHZ6MWV2RlM0d0VFUFRHRUZQSEJvZzpMOHFxOVBaeVJn
'                      NmllS0dFS2hab2xHQzB2SldMdzhpRUo4OERSZHlPZw==
' Content-Type: application/x-www-form-urlencoded;charset=UTF-8
' Content-Length: 29
' Accept-Encoding: gzip
' 
' grant_type=client_credentials

' Update these values with your consumer key and secret (also known as API key and API secret).
Dim consumerKey As String
consumerKey = "TWITTER_CONSUMER_KEY"
Dim consumerSecret As String
consumerSecret = "TWITTER_CONSUMER_SECRET"

Dim http As New ChilkatHttp

http.BasicAuth = 1
http.Login = consumerKey
http.Password = consumerSecret

Dim req As New ChilkatHttpRequest
req.AddParam "grant_type","client_credentials"

Dim resp As ChilkatHttpResponse
Set resp = http.PostUrlEncoded("https://api.twitter.com/oauth2/token",req)
If (http.LastMethodSuccess <> 1) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

Debug.Print "Response Status Code: " & resp.StatusCode

If (resp.StatusCode <> 200) Then
    Debug.Print "Expected a 200 response status code for success."
    Debug.Print resp.BodyStr
    Exit Sub
End If

' We should get a JSON response like this:

' {
'     "token_type":"bearer",
'     "access_token":"..."
' }

Dim json As New ChilkatJsonObject
success = json.Load(resp.BodyStr)

Debug.Print "Access token = " & json.StringOf("access_token")


 

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