(Go) Google Drive Refresh Access Token

Demonstrates how to automatically refresh the access token when it expires.

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

    success := true

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope.

    // The access token (and refresh token) was previously saved to a JSON file with this format:
    // See Get Google Drive OAuth2 Access Token

    // {
    //   "access_token": "ya29.Gls-BsdxTWuenChv ... yzVIrXikkLxu5T6dy4I6GjADFardoz4Lruw",
    //   "expires_in": 3600,
    //   "refresh_token": "1/tMBJ ... 27D-Hk6rpQYBA",
    //   "scope": "https://www.googleapis.com/auth/drive",
    //   "token_type": "Bearer"
    // }

    json := chilkat.NewJsonObject()
    tokenFilePath := "qa_data/tokens/googleDrive.json"
    json.LoadFile(tokenFilePath)

    oauth2 := chilkat.NewOAuth2()
    oauth2.SetAccessToken(*json.StringOf("access_token"))
    oauth2.SetRefreshToken(*json.StringOf("refresh_token"))

    oauth2.SetAuthorizationEndpoint("https://accounts.google.com/o/oauth2/v2/auth")
    oauth2.SetTokenEndpoint("https://www.googleapis.com/oauth2/v4/token")

    //  Replace these with actual values.
    oauth2.SetClientId("GOOGLE-CLIENT-ID")
    oauth2.SetClientSecret("GOOGLE-CLIENT-SECRET")
    oauth2.SetScope("https://www.googleapis.com/auth/drive")

    // Use OAuth2 to refresh the access token.
    success = oauth2.RefreshAccessToken()
    if success != true {
        fmt.Println(oauth2.LastErrorText())
        json.DisposeJsonObject()
        oauth2.DisposeOAuth2()
        return
    }

    fmt.Println(oauth2.AccessTokenResponse())

    // Save the new access token to our JSON file (so we can refresh it again when needed).
    json.UpdateString("access_token",oauth2.AccessToken())

    fac := chilkat.NewFileAccess()
    fac.WriteEntireTextFile(tokenFilePath,*json.Emit(),"utf-8",false)

    fmt.Println("Access Token Refreshed!")

    json.DisposeJsonObject()
    oauth2.DisposeOAuth2()
    fac.DisposeFileAccess()