(C) Adobe Sign OAuth2 Access Token

See more OAuth2 Examples

Note: This example requires Chilkat v10.1.2 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();

    // The Adobe Sign OAuth2 requires an "https" callback URL.  This means the "http://localhost:<portNumber>/" is not possible.
    // For a desktop app, you must provide a script on your web server to redirect to "http://localhost:<portNumber>/"

    // See Using Your Web Server as an Intermediary for OAuth2 Redirect to localhost

    CkOAuth2_putAppCallbackUrl(oauth2,"https://yourwebserver.com/OAuth2.php");
    CkOAuth2_putListenPort(oauth2,3017);

    CkOAuth2_putAuthorizationEndpoint(oauth2,"https://secure.na2.echosign.com/public/oauth");
    CkOAuth2_putTokenEndpoint(oauth2,"https://api.na2.echosign.com/oauth/token");

    // Replace these with actual values.
    CkOAuth2_putClientId(oauth2,"MY_CLIENT_ID");

    // This is for Require Proof Key for Code Exchange (PKCE)
    // See OAuth2 PKCE Explained
    CkOAuth2_putCodeChallenge(oauth2,TRUE);
    CkOAuth2_putCodeChallengeMethod(oauth2,"S256");

    // Indicate the desired access by listing scopes.
    CkOAuth2_putScope(oauth2,"user_read agreement_read workflow_read");

    // 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;
    }

    printf("url = %s\n",url);

    // 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 user to approve or deny authorization in the browser.
    numMsWaited = 0;
    while ((numMsWaited < 90000) && (CkOAuth2_getAuthFlowState(oauth2) < 3)) {
        CkOAuth2_SleepMs(oauth2,100);
        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 (CkOAuth2_getAuthFlowState(oauth2) < 3) {
        CkOAuth2_Cancel(oauth2);
        printf("No response from the browser!\n");
        CkOAuth2_Dispose(oauth2);
        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 (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/adobe-sign-access-token.json","utf-8",FALSE);

    // The full JSON received looks like this:
    // {
    //   "access_token": "3AAABL ... YCpUu",
    //   "refresh_token": "3AAABL ... tpDs0*",
    //   "token_type": "Bearer",
    //   "expires_in": 3600
    // }

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


    CkOAuth2_Dispose(oauth2);
    CkStringBuilder_Dispose(sbJson);

    }