(C) Datev OAuth2 Access Token

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

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#include <C_CkOAuth2.h>
#include <C_CkStringBuilder.h>

void ChilkatSample(void)
    {
    HCkOAuth2 oauth2;
    const char *url;
    BOOL success;
    int numMsWaited;
    HCkStringBuilder sbJson;

    // To further clarify, see OAuth 2.0 Authorization Flow

    oauth2 = CkOAuth2_Create();

    // Your Datev app should use "http://localhost" (no trailing forward slash) for the redirect URL.
    CkOAuth2_putListenPort(oauth2,3017);

    // 

    CkOAuth2_putAuthorizationEndpoint(oauth2,"https://login.datev.de/openidsandbox/authorize");
    CkOAuth2_putTokenEndpoint(oauth2,"https://sandbox-api.datev.de/token");

    // Replace this with your actual client ID.
    CkOAuth2_putClientId(oauth2,"DATEV_CLIENT_ID");
    CkOAuth2_putClientSecret(oauth2,"DATEV_CLIENT_SECRET");

    CkOAuth2_putCodeChallenge(oauth2,TRUE);
    CkOAuth2_putCodeChallengeMethod(oauth2,"S256");

    CkOAuth2_putScope(oauth2,"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.
    url = CkOAuth2_startAuth(oauth2);
    if (CkOAuth2_getLastMethodSuccess(oauth2) != TRUE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // Launch the default browser on the system and navigate to the url.
    // The LaunchBrowser method was added in Chilkat v10.1.2.
    success = CkOAuth2_LaunchBrowser(oauth2,url);
    if (success == FALSE) {
        printf("%s\n",CkOAuth2_lastErrorText(oauth2));
        CkOAuth2_Dispose(oauth2);
        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;
    while ((numMsWaited < 90000) && (CkOAuth2_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2_SleepMs(oauth2,100);
        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 (CkOAuth2_getAuthFlowState(oauth2) < 3) {
        CkOAuth2_Cancel(oauth2);
        printf("No response from the browser!\n");
        CkOAuth2_Dispose(oauth2);
        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 (CkOAuth2_getAuthFlowState(oauth2) == 5) {
        printf("OAuth2 failed to complete.\n");
        printf("%s\n",CkOAuth2_failureInfo(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    if (CkOAuth2_getAuthFlowState(oauth2) == 4) {
        printf("OAuth2 authorization was denied.\n");
        printf("%s\n",CkOAuth2_accessTokenResponse(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    if (CkOAuth2_getAuthFlowState(oauth2) != 3) {
        printf("Unexpected AuthFlowState:%d\n",CkOAuth2_getAuthFlowState(oauth2));
        CkOAuth2_Dispose(oauth2);
        return;
    }

    // Save the full JSON access token response to a file.
    sbJson = CkStringBuilder_Create();
    CkStringBuilder_Append(sbJson,CkOAuth2_accessTokenResponse(oauth2));
    CkStringBuilder_WriteFile(sbJson,"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		
    // }

    printf("OAuth2 authorization granted!\n");
    printf("Access Token = %s\n",CkOAuth2_accessToken(oauth2));


    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);

    }