(Objective-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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#import <CkoJsonObject.h>
#import <CkoHttpCurl.h>
#import <NSString.h>

BOOL success = NO;

// 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 = NO;

// --------------------------------------------------------------------------------------------------------
// 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.
CkoJsonObject *jsonAuth = [[CkoJsonObject alloc] init];

// 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
jsonAuth.EnableSecrets = YES;

success = [jsonAuth UpdateString: @"oauth2.client_id" value: @"!!sharepoint|oauth2|client_id"];
if (success == YES) {
    success = [jsonAuth UpdateString: @"oauth2.client_secret" value: @"!!sharepoint|oauth2|client_secret"];
}

if (success == YES) {
    success = [jsonAuth UpdateString: @"oauth2.token_endpoint" value: @"!!sharepoint|oauth2|token_endpoint"];
}

if (success == NO) {
    NSLog(@"%@",jsonAuth.LastErrorText);
    return;
}

// Request Microsoft Graph permissions that were granted to the application.
[jsonAuth UpdateString: @"oauth2.scope" value: @"https://graph.microsoft.com/.default"];

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

CkoHttpCurl *curl = [[CkoHttpCurl alloc] init];

// 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.
[curl SetAuth: jsonAuth];

// Define variables whose values are already known.
// 
// These variables are referenced in the curl command using
// {{variable_name}} substitution syntax.
[curl SetVar: @"sharepoint_hostname" varValue: @"example.sharepoint.com"];
[curl SetVar: @"site_name" varValue: @"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.
[curl AddFunction: @"getSite" curl: @"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.
[curl AddOutput: @"getSite" jsonPath: @"id" varName: @"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.
NSString *curlCommand = @"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 = [curl DoYourThing: curlCommand];
if (success == NO) {
    NSLog(@"%@",curl.LastErrorText);
    return;
}

// A successful Graph response should return HTTP 200.
// Any other status code typically indicates an authentication,
// permission, or resource lookup error.
int statusCode = [curl.StatusCode intValue];
if (statusCode != 200) {
    NSLog(@"%@",curl.ResponseBodyStr);
    NSLog(@"%@%d",@"status code = ",statusCode);
    return;
}

// The response body contains a JSON array named "value".
// Each element of the array describes a SharePoint document library.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;
[curl GetResponseJson: json];
NSLog(@"%@",[json Emit]);

// Iterate over the document libraries returned by Microsoft Graph
// and display selected properties for each library.
int i = 0;
int numDrives = [[json SizeOfArray: @"value"] intValue];
while (i < numDrives) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%@",@"name: ",[json StringOf: @"value[i].name"]);
    NSLog(@"%@%@",@"description: ",[json StringOf: @"value[i].description"]);
    NSLog(@"%@%@",@"id: ",[json StringOf: @"value[i].id"]);
    NSLog(@"%@%@",@"webUrl: ",[json StringOf: @"value[i].webUrl"]);
    NSLog(@"%@%@",@"displayName: ",[json StringOf: @"value[i].createdBy.user.displayName"]);
    NSLog(@"%@",@"-");
    i = i + 1;
}

NSLog(@"%@",@"Success.");