(Unicode C) SharePoint List Document Libraries

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This example shows how to use Chilkat's HttpCurl class to list the document libraries in a SharePoint site. In Microsoft Graph, SharePoint document libraries are represented as drives. The example demonstrates how HttpCurl can automatically resolve a SharePoint site name to its Microsoft Graph site ID, then use that ID to retrieve and display the site's document libraries.

Note: This example requires Chilkat v11.5.0 or greater.

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#include <C_CkJsonObjectW.h>
#include <C_CkHttpCurlW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkJsonObjectW jsonAuth;
    HCkHttpCurlW curl;
    const wchar_t *curlCommand;
    int statusCode;
    HCkJsonObjectW json;
    int i;
    int numDrives;

    success = FALSE;

    // This example retrieves the document libraries for a SharePoint site.
    // 
    // In Microsoft Graph terminology, a document library is represented as a "drive".
    // The example demonstrates how HttpCurl can automatically resolve a SharePoint
    // site name to a site ID before requesting the site's document libraries.

    success = FALSE;

    // --------------------------------------------------------------------------------------------------------
    // Before running this example, create an Azure App Registration and grant it
    // the Microsoft Graph permissions required to access SharePoint.
    // 
    // The application will authenticate using OAuth2 Client Credentials.
    // See:
    // How to Create SharePoint App Registration for OAuth 2.0 Client Credentials
    // --------------------------------------------------------------------------------------------------------

    // Build a JSON authentication configuration.
    // HttpCurl will use this information to automatically obtain OAuth2 access tokens.
    jsonAuth = CkJsonObjectW_Create();

    // Enable secret lookup.
    // 
    // Instead of hard-coding sensitive values such as the client ID,
    // client secret, and token endpoint, secret specification strings
    // are used.  Chilkat automatically retrieves the actual values from
    // Windows Credential Manager (Windows) or Apple Keychain (macOS).
    // 
    // See:
    // Secret Specification Strings
    CkJsonObjectW_putEnableSecrets(jsonAuth,TRUE);

    success = CkJsonObjectW_UpdateString(jsonAuth,L"oauth2.client_id",L"!!sharepoint|oauth2|client_id");
    if (success == TRUE) {
        success = CkJsonObjectW_UpdateString(jsonAuth,L"oauth2.client_secret",L"!!sharepoint|oauth2|client_secret");
    }

    if (success == TRUE) {
        success = CkJsonObjectW_UpdateString(jsonAuth,L"oauth2.token_endpoint",L"!!sharepoint|oauth2|token_endpoint");
    }

    if (success == FALSE) {
        wprintf(L"%s\n",CkJsonObjectW_lastErrorText(jsonAuth));
        CkJsonObjectW_Dispose(jsonAuth);
        return;
    }

    // Request Microsoft Graph permissions that were granted to the application.
    CkJsonObjectW_UpdateString(jsonAuth,L"oauth2.scope",L"https://graph.microsoft.com/.default");

    // ---------------------------------------------------------------------------------------------------

    curl = CkHttpCurlW_Create();

    // Associate the OAuth2 configuration with HttpCurl.
    // 
    // When the request is executed, Chilkat automatically obtains an access token
    // if needed and adds the Authorization: Bearer header to the HTTP request.
    CkHttpCurlW_SetAuth(curl,jsonAuth);

    // Define variables whose values are already known.
    // 
    // These variables are referenced in the curl command using
    // {{variable_name}} substitution syntax.
    CkHttpCurlW_SetVar(curl,L"sharepoint_hostname",L"example.sharepoint.com");
    CkHttpCurlW_SetVar(curl,L"site_name",L"test");

    // The document libraries endpoint requires a Microsoft Graph site ID.
    // 
    // Because the application only knows the SharePoint site name,
    // HttpCurl must first retrieve the corresponding site ID.
    // 
    // Define a function that can resolve the site_id variable when needed.
    // HttpCurl may execute this function automatically if it determines that
    // site_id is required by another request.
    CkHttpCurlW_AddFunction(curl,L"getSite",L"GET https://graph.microsoft.com/v1.0/sites/root:/sites/{{site_name}}");

    // Extract the "id" field from the getSite response and store it
    // in the HttpCurl variable named "site_id".
    // 
    // Any later request that references {{site_id}} can use this value.
    CkHttpCurlW_AddOutput(curl,L"getSite",L"id",L"site_id");

    // The target Microsoft Graph request:
    // 
    // curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives
    // 
    // This request returns the document libraries belonging to the site.
    // 
    // Microsoft Graph refers to document libraries as "drives",
    // so each object in the response represents one document library.
    // 
    // No Authorization header is included because HttpCurl automatically
    // adds it when OAuth2 authentication is configured.
    curlCommand = L"curl -X GET \"https://graph.microsoft.com/v1.0/sites/{{site_id}}/drives\"";

    // Execute the request.
    // 
    // HttpCurl examines the target curl command and determines that
    // the variable {{site_id}} is required.
    // 
    // Because site_id is not yet known, HttpCurl searches for a function
    // capable of producing it.  The getSite function provides the "id"
    // output, which is mapped to the site_id variable.
    // 
    // The execution plan becomes:
    // 
    //   1) Execute getSite to obtain site_id.
    //   2) Substitute {{site_id}} into the target request.
    //   3) Execute the drives request.
    // 
    // The final HTTP response returned by DoYourThing is always the
    // response from the target curl command, which is the last step in the plan.
    success = CkHttpCurlW_DoYourThing(curl,curlCommand);
    if (success == FALSE) {
        wprintf(L"%s\n",CkHttpCurlW_lastErrorText(curl));
        CkJsonObjectW_Dispose(jsonAuth);
        CkHttpCurlW_Dispose(curl);
        return;
    }

    // A successful Graph response should return HTTP 200.
    // Any other status code typically indicates an authentication,
    // permission, or resource lookup error.
    statusCode = CkHttpCurlW_getStatusCode(curl);
    if (statusCode != 200) {
        wprintf(L"%s\n",CkHttpCurlW_responseBodyStr(curl));
        wprintf(L"status code = %d\n",statusCode);
        CkJsonObjectW_Dispose(jsonAuth);
        CkHttpCurlW_Dispose(curl);
        return;
    }

    // The response body contains a JSON array named "value".
    // Each element of the array describes a SharePoint document library.
    json = CkJsonObjectW_Create();
    CkJsonObjectW_putEmitCompact(json,FALSE);
    CkHttpCurlW_GetResponseJson(curl,json);
    wprintf(L"%s\n",CkJsonObjectW_emit(json));

    // Iterate over the document libraries returned by Microsoft Graph
    // and display selected properties for each library.
    i = 0;
    numDrives = CkJsonObjectW_SizeOfArray(json,L"value");
    while (i < numDrives) {
        CkJsonObjectW_putI(json,i);
        wprintf(L"name: %s\n",CkJsonObjectW_stringOf(json,L"value[i].name"));
        wprintf(L"description: %s\n",CkJsonObjectW_stringOf(json,L"value[i].description"));
        wprintf(L"id: %s\n",CkJsonObjectW_stringOf(json,L"value[i].id"));
        wprintf(L"webUrl: %s\n",CkJsonObjectW_stringOf(json,L"value[i].webUrl"));
        wprintf(L"displayName: %s\n",CkJsonObjectW_stringOf(json,L"value[i].createdBy.user.displayName"));
        wprintf(L"-\n");
        i = i + 1;
    }

    wprintf(L"Success.\n");


    CkJsonObjectW_Dispose(jsonAuth);
    CkHttpCurlW_Dispose(curl);
    CkJsonObjectW_Dispose(json);

    }