Rust Requires Chilkat v10.1.3+

Datev OAuth2 Access Token

See more Datev Examples

Demonstrates how to get a Datev OAuth2 access token from a desktop application or script. Rust

// To further clarify, see OAuth 2.0 Authorization Flow

let oauth2 = chilkat::OAuth2::new();

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

// 

oauth2.set_authorization_endpoint("https://login.datev.de/openidsandbox/authorize");
oauth2.set_token_endpoint("https://sandbox-api.datev.de/token");

// Replace this with your actual client ID.
oauth2.set_client_id("DATEV_CLIENT_ID");
oauth2.set_client_secret("DATEV_CLIENT_SECRET");

oauth2.set_code_challenge(true);
oauth2.set_code_challenge_method("S256");

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

// Begin the OAuth2 authorization code flow.  This returns a URL that should be loaded in a browser.
let Ok(url) = oauth2.start_auth() else {
    println!("{}", oauth2.last_error_text());
    return;
};

// Launch the default browser on the system and navigate to the url.
// The LaunchBrowser method was added in Chilkat v10.1.2.
if oauth2.launch_browser(&url).is_err() {
    println!("{}", oauth2.last_error_text());
    return;
}

// Wait for the interactive user to grant permission in the interactive browser session.
// We'll wait for a max of 90 seconds.
let mut num_ms_waited = 0;
while (num_ms_waited < 90000) && (oauth2.auth_flow_state() < 3) {
    oauth2.sleep_ms(100);
    num_ms_waited = num_ms_waited + 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 background thread is waiting to receive the redirect HTTP request from the browser.
// 2: Waiting for Final Response. The 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.auth_flow_state() < 3 {
    let _ = oauth2.cancel();
    println!("No response from the browser!");
    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 flow has completed, the background thread exited, and the successful JSON response is available in AccessTokenResponse property.
// 4: Completed with Access Denied. The OAuth2 flow has completed, the background thread exited, and the error JSON is available in AccessTokenResponse property.
// 5: Failed Prior to Completion. The OAuth2 flow failed to complete, the background thread exited, and the error information is available in the FailureInfo property.
if oauth2.auth_flow_state() == 5 {
    println!("OAuth2 failed to complete.");
    println!("{}", oauth2.failure_info());
    return;
}

if oauth2.auth_flow_state() == 4 {
    println!("OAuth2 authorization was denied.");
    println!("{}", oauth2.access_token_response());
    return;
}

if oauth2.auth_flow_state() != 3 {
    println!("Unexpected AuthFlowState:{}", oauth2.auth_flow_state());
    return;
}

// Save the full JSON access token response to a file.
let sb_json = chilkat::StringBuilder::new();
let _ = sb_json.append(&oauth2.access_token_response());
let _ = sb_json.write_file("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		
// }

println!("OAuth2 authorization granted!");
println!("Access Token = {}", oauth2.access_token());