(Go) Quickbooks OAuth2 in a Desktop App

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

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    // To further clarify, see OAuth 2.0 Authorization Flow

    // ------------------------------------------------------------------------------------------------
    // IMPORTANT: You first need to define an App in the Quickbooks Developer Dashboard.
    // See How to Create an App in QuickBooks Developer Dashboard
    // ------------------------------------------------------------------------------------------------

    // This example is for desktop applicatons (it is not for code that runs on a web server).
    // You'll need to add a line (or a few lines of code) to popup a web browser that navigates to a URL.

    // This is the way to initially obtain the OAuth2 access token.  Afterwards it can be 
    // repeatedly refreshed without user interaction, as shown in this example: Refresh Quickbooks OAuth2 Access Token.

    oauth2 := chilkat.NewOAuth2()

    // QuickBooks OAuth2 allows for an "http://localhost:<portNumber>/" callback URL for sandbox testing,
    // but not for production.

    // In production, your applicaton must use your own public web server as an intermediate
    // to receive and forward the redirect to localhost.
    // See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

    oauth2.SetAppCallbackUrl("https://yourwebserver.com/OAuth2.php")
    oauth2.SetListenPort(3017)

    oauth2.SetAuthorizationEndpoint("https://appcenter.intuit.com/connect/oauth2")
    oauth2.SetTokenEndpoint("https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer")

    // Replace these with actual values.
    oauth2.SetClientId("QUICKBOOKS-CLIENT-ID")
    oauth2.SetClientSecret("QUICKBOOKS-CLIENT-SECRET")
    oauth2.SetUseBasicAuth(true)
    oauth2.SetCodeChallenge(false)

    // Indicate the desired access.  Possible scopes that can appear in the list are:
    // com.intuit.quickbooks.accounting:  QuickBooks Online API
    // com.intuit.quickbooks.payment:  QuickBooks Payments API
    // openid:  OpenID Connect processing
    // profile:  user's given and family names
    // email:  user's email address
    // phone:  user's phone number
    // address:  user's physical address
    oauth2.SetScope("com.intuit.quickbooks.accounting")

    // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
    url := oauth2.StartAuth()
    if oauth2.LastMethodSuccess() != true {
        fmt.Println(oauth2.LastErrorText())
        oauth2.DisposeOAuth2()
        return
    }

    fmt.Println("url = ", *url)

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success := oauth2.LaunchBrowser(*url)
    if success == false {
        fmt.Println(oauth2.LastErrorText())
        oauth2.DisposeOAuth2()
        return
    }

    // Wait for the user to approve or deny authorization in the browser.
    numMsWaited := 0
    for (numMsWaited < 90000) && (oauth2.AuthFlowState() < 3) {
        oauth2.SleepMs(100)
        numMsWaited = numMsWaited + 100
    }

    // If the browser does not respond within the specified time, AuthFlowState will be:
    // 
    // 1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
    // 2: Waiting for Final Response – The thread is awaiting the final access token response.
    // In either case, cancel the background task initiated by StartAuth.

    if oauth2.AuthFlowState() < 3 {
        oauth2.Cancel()
        fmt.Println("No response from the browser!")
        oauth2.DisposeOAuth2()
        return
    }

    // Check AuthFlowState to determine if authorization was granted, denied, or failed:
    // 
    // 3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
    // 4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
    // 5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

    if oauth2.AuthFlowState() == 5 {
        fmt.Println("OAuth2 failed to complete.")
        fmt.Println(oauth2.FailureInfo())
        oauth2.DisposeOAuth2()
        return
    }

    if oauth2.AuthFlowState() == 4 {
        fmt.Println("OAuth2 authorization was denied.")
        fmt.Println(oauth2.AccessTokenResponse())
        oauth2.DisposeOAuth2()
        return
    }

    if oauth2.AuthFlowState() != 3 {
        fmt.Println("Unexpected AuthFlowState:", oauth2.AuthFlowState())
        oauth2.DisposeOAuth2()
        return
    }

    // Save the full JSON access token response to a file.
    sbJson := chilkat.NewStringBuilder()
    sbJson.Append(oauth2.AccessTokenResponse())
    sbJson.WriteFile("qa_data/tokens/qb-access-token.json","utf-8",false)

    // The full JSON received looks like this:
    // {
    //   "expires_in": 3600,
    //   "x_refresh_token_expires_in": 8726400,
    //   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
    //   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
    //   "token_type": "bearer"
    // }

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

    // Get the realmId if needed...
    // See About the QuickBooks REST API Realm ID, also known as Company ID
    realmId := oauth2.GetRedirectRequestParam("realmId")
    if oauth2.LastMethodSuccess() == true {
        fmt.Println("realmId: ", *realmId)
    } else {
        fmt.Println("No realmId was provided.")
    }


    oauth2.DisposeOAuth2()
    sbJson.DisposeStringBuilder()