(Go) Salesforce OAuth2 Refresh Access Token

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Note: Use Chilkat v10.1.2 or later for this example.

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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 SalesForce OAuth2 Access Token via Authorization Flow

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

    // This is an example of a Salesforce OAuth2 access token to be refreshed:

    // {
    //   "access_token": "00D41000....uLZBpT6",
    //   "refresh_token": "5Aep....25xdGgkrV",
    //   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
    //   "scope": "refresh_token id",
    //   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
    //   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
    //   "token_type": "Bearer",
    //   "issued_at": "1738348388166"
    // }

    oauth2 := chilkat.NewOAuth2()

    oauth2.SetTokenEndpoint("https://login.salesforce.com/services/oauth2/token")

    // Replace this with your actual client ID (Consumer Key)
    oauth2.SetClientId("CLIENT_ID")

    // Note: The client secret is not required because we configured our Connected App
    // to not require it for the refresh flow.  See the screenshot below.

    // 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
    }

    // The response contains a new access token, but we must keep
    // our existing refresh token for when we need to refresh again in the future.
    jsonToken.UpdateString("access_token",oauth2.AccessToken())

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

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

    // --------------------------------------------------------------------------
    // Here's a screenshot of a Salesforce Connected App 
    // which does not requires the secret for the authorization or refresh flow.
    // 

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