(Objective-C) List all Pages of Files in Google Drive

Demonstrates how iterate over pages to list files in Google Drive.

See Google Drive Files list for more optional HTTP parameters.

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#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoJsonObject.h>
#import <NSString.h>

BOOL success = YES;

// It requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example uses a previously obtained access token having permission for the 
// Google Drive scope.

CkoAuthGoogle *gAuth = [[CkoAuthGoogle alloc] init];
gAuth.AccessToken = @"GOOGLE-DRIVE-ACCESS-TOKEN";

CkoRest *rest = [[CkoRest alloc] init];

// Connect using TLS.
BOOL bAutoReconnect = YES;
success = [rest Connect: @"www.googleapis.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];

// Provide the authentication credentials (i.e. the access token)
[rest SetAuthGoogle: gAuth];

// Get 5 results per page for testing.  (The default page size is 100, with a max of 1000.
[rest AddQueryParam: @"pageSize" value: @"5"];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
int i;
int numFiles;

// Send the request for the 1st page.
NSString *jsonResponse = [rest FullRequestNoBody: @"GET" uriPath: @"/drive/v3/files"];

int pageNumber = 1;
NSString *pageToken = 0;
BOOL bContinueLoop = rest.LastMethodSuccess && ([rest.ResponseStatusCode intValue] == 200);

while (bContinueLoop == YES) {

    NSLog(@"%@%d%@",@"---- Page ",pageNumber,@" ----");

    // Iterate over each file in the response and show the name, id, and mimeType.
    [json Load: jsonResponse];

    // See the sample JSON response at the bottom of this example.
    numFiles = [[json SizeOfArray: @"files"] intValue];
    i = 0;
    while (i < numFiles) {
        json.I = [NSNumber numberWithInt: i];
        NSLog(@"%@%@",@"name: ",[json StringOf: @"files[i].name"]);
        NSLog(@"%@%@",@"id: ",[json StringOf: @"files[i].id"]);
        NSLog(@"%@%@",@"mimeType: ",[json StringOf: @"files[i].mimeType"]);
        NSLog(@"%@",@"-");
        i = i + 1;
    }

    // Get the next page of files.
    // If the "nextPageToken" is present in the JSON response, then use it in the "pageToken" parameter
    // for the next request.   If no "nextPageToken" was present, then this was the last page of files.
    pageToken = [json StringOf: @"nextPageToken"];
    bContinueLoop = NO;
    BOOL bHasMorePages = json.LastMethodSuccess;
    if (bHasMorePages == YES) {
        [rest ClearAllQueryParams];
        [rest AddQueryParam: @"pageSize" value: @"5"];
        [rest AddQueryParam: @"pageToken" value: pageToken];
        jsonResponse = [rest FullRequestNoBody: @"GET" uriPath: @"/drive/v3/files"];
        bContinueLoop = rest.LastMethodSuccess && ([rest.ResponseStatusCode intValue] == 200);
        pageNumber = pageNumber + 1;
    }

}

if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A successful response will have a status code equal to 200.
if ([rest.ResponseStatusCode intValue] != 200) {
    NSLog(@"%@%d",@"response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@%@",@"response status text = ",rest.ResponseStatusText);
    NSLog(@"%@%@",@"response header: ",rest.ResponseHeader);
    NSLog(@"%@%@",@"response JSON: ",jsonResponse);
    return;
}

// A successful JSON response looks like this:
// {
//  "kind": "drive#fileList",
//  "files": [
//    {
//      "kind": "drive#file",
//      "id": "0B53Q6OSTWYolenpjTEU4ekJlQUU",
//      "name": "test",
//      "mimeType": "application/vnd.google-apps.folder"
//    },
//    {
//      "kind": "drive#file",
//      "id": "0B53Q6OSTWYolRm4ycjZtdXhRaEE",
//      "name": "starfish4.jpg",
//      "mimeType": "image/jpeg"
//    },
//    {
//      "kind": "drive#file",
//      "id": "0B53Q6OSTWYolMWt2VzN0Qlo1UjA",
//      "name": "hamlet2.xml",
//      "mimeType": "text/xml"
//    },
// ...
//    {
//      "kind": "drive#file",
//      "id": "0B53Q6OSTWYolc3RhcnRlcl9maWxlX2Rhc2hlclYw",
//      "name": "Getting started",
//      "mimeType": "application/pdf"
//    }
//  ]
// }