(Swift) Datev OAuth2 Access Token

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

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func chilkatTest() {
    // To further clarify, see OAuth 2.0 Authorization Flow

    let oauth2 = CkoOAuth2()!

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

    // 

    oauth2.authorizationEndpoint = "https://login.datev.de/openidsandbox/authorize"
    oauth2.tokenEndpoint = "https://sandbox-api.datev.de/token"

    // Replace this with your actual client ID.
    oauth2.clientId = "DATEV_CLIENT_ID"
    oauth2.clientSecret = "DATEV_CLIENT_SECRET"

    oauth2.codeChallenge = true
    oauth2.codeChallengeMethod = "S256"

    oauth2.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.
    var url: String? = oauth2.start()
    if oauth2.lastMethodSuccess != true {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    var success: Bool = oauth2.launchBrowser(url)
    if success == false {
        print("\(oauth2.lastErrorText!)")
        return
    }

    // Wait for the interactive user to grant permission in the interactive browser session.
    // We'll wait for a max of 90 seconds.
    var numMsWaited: Int = 0
    while (numMsWaited < 90000) && (oauth2.authFlowState.intValue < 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 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.authFlowState.intValue < 3 {
        oauth2.cancel()
        print("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.authFlowState.intValue == 5 {
        print("OAuth2 failed to complete.")
        print("\(oauth2.failureInfo!)")
        return
    }

    if oauth2.authFlowState.intValue == 4 {
        print("OAuth2 authorization was denied.")
        print("\(oauth2.accessTokenResponse!)")
        return
    }

    if oauth2.authFlowState.intValue != 3 {
        print("Unexpected AuthFlowState:\(oauth2.authFlowState.intValue)")
        return
    }

    // Save the full JSON access token response to a file.
    let sbJson = CkoStringBuilder()!
    sbJson.append(oauth2.accessTokenResponse)
    sbJson.writeFile("qa_data/tokens/datev.json", charset: "utf-8", emitBom: 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		
    // }

    print("OAuth2 authorization granted!")
    print("Access Token = \(oauth2.accessToken!)")

}