B4X Requires Chilkat v10.1.2+

X.com OAuth 2.0 Refresh Access Token

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Demonstrates how to get an X.com OAuth2 access token from a desktop application or script. B4X

Dim success As Boolean = False

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

Dim jsonToken As ChilkatJsonObject
jsonToken.Initialize
success = jsonToken.LoadFile("qa_data/tokens/x.json")
If success <> True Then
    Log("Failed to load x.json")
    Return
End If


'  The access token JSON looks something like this:

'  {
'    "token_type": "bearer",
'    "expires_in": 7200,
'    "access_token": "VmNDLVZiYUZwejY5Mkx3RblFTmo3ek1leTRGclMuZFVOUTVUTWpNbVZKb1N5OjE3NDAxNjk4MDVxNTE6MToxOaF0OjE",
'    "scope": "block.read follows.read offline.access tweet.write block.write like.write like.read users.read tweet.read follows.write",
'    "refresh_token": "eThOWVVFSTRqdVp3QTFndGsxM2ZGZmFyNWVrU0phM1JKbGdrbGNWRGJzb1loOjE3NDAwMjk4MDUxNTI6MTowOnJ0OjE"
'  }

Dim oauth2 As ChilkatOAuth2
oauth2.Initialize("oauth2")

oauth2.TokenEndpoint = "https://api.x.com/2/oauth2/token"

'  Replace this with your actual X.com OAuth2 Client ID and Client Secret
oauth2.ClientId = "OAUTH2_CLIENT_ID"
oauth2.ClientSecret = "OAUTH2_CLIENT_SECRET"

'  Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token")

'  Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken
If success <> True Then
    Log(oauth2.LastErrorText)
    Return
End If


'  Load the access token response into the json object 
jsonToken.Load(oauth2.AccessTokenResponse)

'  If an "expires_on" member does not exist, then add the JSON member by
'  getting the current system date/time and adding the "expires_in" seconds.
'  This way we'll know when the token expires.
If jsonToken.HasMember("expires_on") = False Then
    Dim dtExpire As ChilkatDateTime
    dtExpire.Initialize
    dtExpire.SetFromCurrentSystemTime
    dtExpire.AddSeconds(jsonToken.IntOf("expires_in"))
    jsonToken.AppendString("expires_on", dtExpire.GetAsUnixTimeStr(False))
End If


'  Save the new JSON access token response to a file.
'  The access + refresh tokens contained in this JSON will be needed for the next refresh.
Dim sbJson As ChilkatStringBuilder
sbJson.Initialize
jsonToken.EmitCompact = False
jsonToken.EmitSb(sbJson)
sbJson.WriteFile("qa_data/tokens/x.json", "utf-8", False)

Log("OAuth2 authorization granted!")
Log("New Access Token = " & oauth2.AccessToken)