(Lianja) X.com OAuth 2.0 Refresh Access Token

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Note: This example requires Chilkat v10.1.2 or greater.

For more information, see https://docs.x.com/resources/fundamentals/authentication/oauth-2-0/authorization-code

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

loJsonToken = createobject("CkJsonObject")
llSuccess = loJsonToken.LoadFile("qa_data/tokens/x.json")
if (llSuccess <> .T.) then
    ? "Failed to load x.json"
    release loJsonToken
    return
endif

// 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"
// }

loOauth2 = createobject("CkOAuth2")

loOauth2.TokenEndpoint = "https://api.x.com/2/oauth2/token"

// Replace this with your actual X.com OAuth2 Client ID and Client Secret
loOauth2.ClientId = "OAUTH2_CLIENT_ID"
loOauth2.ClientSecret = "OAUTH2_CLIENT_SECRET"

// Get the "refresh_token"
loOauth2.RefreshToken = loJsonToken.StringOf("refresh_token")

// Send the HTTP POST to refresh the access token..
llSuccess = loOauth2.RefreshAccessToken()
if (llSuccess <> .T.) then
    ? loOauth2.LastErrorText
    release loJsonToken
    release loOauth2
    return
endif

// Load the access token response into the json object 
loJsonToken.Load(loOauth2.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 (loJsonToken.HasMember("expires_on") = .F.) then
    loDtExpire = createobject("CkDateTime")
    loDtExpire.SetFromCurrentSystemTime()
    loDtExpire.AddSeconds(loJsonToken.IntOf("expires_in"))
    loJsonToken.AppendString("expires_on",loDtExpire.GetAsUnixTimeStr(.F.))
endif

// 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.
loSbJson = createobject("CkStringBuilder")
loJsonToken.EmitCompact = .F.
loJsonToken.EmitSb(loSbJson)
loSbJson.WriteFile("qa_data/tokens/x.json","utf-8",.F.)

? "OAuth2 authorization granted!"
? "New Access Token = " + loOauth2.AccessToken


release loJsonToken
release loOauth2
release loDtExpire
release loSbJson