(Go) Datev OAuth2 Access Token

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Note: This example requires Chilkat v10.1.3 or greater.

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    // To further clarify, see OAuth 2.0 Authorization Flow

    oauth2 := OAuth2_Ref.html">chilkat.NewOAuth2()

    // Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
    oauth2.SetListenPort(3017)

    // 

    oauth2.SetAuthorizationEndpoint("https://login.datev.de/openidsandbox/authorize")
    oauth2.SetTokenEndpoint("https://sandbox-api.datev.de/token")

    // Replace this with your actual client ID.
    oauth2.SetClientId("DATEV_CLIENT_ID")
    oauth2.SetClientSecret("DATEV_CLIENT_SECRET")

    oauth2.SetCodeChallenge(true)
    oauth2.SetCodeChallengeMethod("S256")

    oauth2.SetScope("openid profile email datev:accounting:clients accounting:documents datev:accounting:extf-files-import")

    // Begin the OAuth2_Ref.html">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
    }

    // 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 interactive user to grant permission in the interactive browser session.
    // We'll wait for a max of 90 seconds.
    numMsWaited := 0
    for (numMsWaited < 90000) && (oauth2.AuthFlowState() < 3) {
        oauth2.SleepMs(100)
        numMsWaited = numMsWaited + 100
    }

    // If there was no response from the browser within 90 seconds, then 
    // the AuthFlowState will be equal to 1 or 2.
    // 1: Waiting for Redirect. The OAuth2_Ref.html">OAuth2 background thread is waiting to receive the redirect HTTP request from the browser.
    // 2: Waiting for Final Response. The OAuth2_Ref.html">OAuth2 background thread is waiting for the final access token response.
    // In that case, cancel the background task started in the call to StartAuth.
    if oauth2.AuthFlowState() < 3 {
        oauth2.Cancel()
        fmt.Println("No response from the browser!")
        oauth2.DisposeOAuth2()
        return
    }

    // Check the AuthFlowState to see if authorization was granted, denied, or if some error occurred
    // The possible AuthFlowState values are:
    // 3: Completed with Success. The OAuth2_Ref.html">OAuth2 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
    // 4: Completed with Access Denied. The OAuth2_Ref.html">OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
    // 5: Failed Prior to Completion. The OAuth2_Ref.html">OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
    if oauth2.AuthFlowState() == 5 {
        fmt.Println("OAuth2_Ref.html">OAuth2 failed to complete.")
        fmt.Println(oauth2.FailureInfo())
        oauth2.DisposeOAuth2()
        return
    }

    if oauth2.AuthFlowState() == 4 {
        fmt.Println("OAuth2_Ref.html">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 := StringBuilder_Ref.html">chilkat.NewStringBuilder()
    sbJson.Append(oauth2.AccessTokenResponse())
    sbJson.WriteFile("qa_data/tokens/datev.json","utf-8",false)

    // The saved JSON response looks like this:

    // {
    // 	"refresh_token": "ZDA5Y .... FFhTXc9",
    // 	"refresh_token_expires_in": 39600,
    // 	"id_token": "eyJ .... Q9w",
    // 	"access_token": "MTM .... 1UDA9",
    // 	"token_type": "bearer",
    // 	"expires_in": 900		
    // }

    fmt.Println("OAuth2_Ref.html">OAuth2 authorization granted!")
    fmt.Println("Access Token = ", oauth2.AccessToken())

    oauth2.DisposeOAuth2()
    sbJson.DisposeStringBuilder()