(Go) Docusign Refresh OAuth2 Access Token

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Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-code-grant

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

    // It is assumed we previously obtained an OAuth2 access token.
    // This example loads the JSON access token file 
    // saved by this example: Get Docusign OAuth2 Access Token

    jsonToken := chilkat.NewJsonObject()
    success := jsonToken.LoadFile("qa_data/tokens/docusign.json")
    if success != true {
        fmt.Println("Failed to load docusign.json")
        jsonToken.DisposeJsonObject()
        return
    }

    // The access token JSON looks like this:

    // {
    //   "access_token": "eyJ0eXA....YQyig",
    //   "token_type": "Bearer",
    //   "refresh_token": "eyJ0eXA....auE3eHKg",
    //   "expires_in": 28800
    // }

    oauth2 := chilkat.NewOAuth2()

    // For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
    // For the production platform, the token endpoint is https://account.docusign.com/oauth/token
    oauth2.SetTokenEndpoint("https://account-d.docusign.com/oauth/token")

    // Replace these with actual values.
    // The client ID is also known as the "integration key" in Docusign.
    oauth2.SetClientId("MY_DOCUSIGN_CLIENT_ID")
    // This is your secret key for the authorization code grant.
    oauth2.SetClientSecret("MY_DOCUSIGN_CLIENT_SECRET")

    // Get the "refresh_token"
    oauth2.SetRefreshToken(jsonToken.StringOf("refresh_token"))

    // Send the HTTP POST to refresh the access token..
    success = oauth2.RefreshAccessToken()
    if success != true {
        fmt.Println(oauth2.LastErrorText())
        jsonToken.DisposeJsonObject()
        oauth2.DisposeOAuth2()
        return
    }

    fmt.Println("New access token: ", oauth2.AccessToken())
    fmt.Println("New refresh token: ", oauth2.RefreshToken())

    // Update the JSON with the new tokens.
    jsonToken.UpdateString("access_token",oauth2.AccessToken())
    jsonToken.UpdateString("refresh_token",oauth2.RefreshToken())

    // Save the new JSON access token response to a file.
    sbJson := chilkat.NewStringBuilder()
    jsonToken.SetEmitCompact(false)
    jsonToken.EmitSb(sbJson)
    sbJson.WriteFile("qa_data/tokens/docusign.json","utf-8",false)

    fmt.Println("OAuth2 authorization granted!")
    fmt.Println("New Access Token = ", oauth2.AccessToken())

    jsonToken.DisposeJsonObject()
    oauth2.DisposeOAuth2()
    sbJson.DisposeStringBuilder()