(Objective-C) Get File Metadata

Gets a file's metadata or content by ID.

See Google Drive Files get for additional details.

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#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoStringBuilder.h>
#import <NSString.h>
#import <CkoJsonObject.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.
// A single REST object, once connected, can be used for many Google Drive REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
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];

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

// We need to send a GET request like this:
// GET https://www.googleapis.com/drive/v3/files/fileId
// The fileId is part of the path.
CkoStringBuilder *sbPath = [[CkoStringBuilder alloc] init];
[sbPath Append: @"/drive/v3/files/"];
// Assume we previously obtained the fileId for the file of interest...
[sbPath Append: @"0B53Q6OSTWYolbUF6WS1Gei1oalk"];

// Indicate that we want ALL possible fields.
// If no fields are indicated, then only the basic fields are returned.
NSString *allFields = @"appProperties,capabilities,contentHints,createdTime,description,explicitlyTrashed,fileExtension,folderColorRgb,fullFileExtension,headRevisionId,iconLink,id,imageMediaMetadata,isAppAuthorized,kind,lastModifyingUser,md5Checksum,mimeType,modifiedByMeTime,modifiedTime,name,originalFilename,ownedByMe,owners,parents,permissions,properties,quotaBytesUsed,shared,sharedWithMeTime,sharingUser,size,spaces,starred,thumbnailLink,trashed,version,videoMediaMetadata,viewedByMe,viewedByMeTime,viewersCanCopyContent,webContentLink,webViewLink,writersCanShare";

[rest AddQueryParam: @"fields" value: allFields];

NSString *jsonResponse = [rest FullRequestNoBody: @"GET" uriPath: [sbPath GetAsString]];
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;
}

// ---------------------------------------------------
// Sample code for parsing this JSON is shown below...
// ---------------------------------------------------

// A successful response looks like this:
// {
//   "kind": "drive#file",
//   "id": "0B53Q6OSTWYolbUF6WS1Gei1oalk",
//   "name": "penguins.jpg",
//   "mimeType": "image/jpeg",
//   "starred": false,
//   "trashed": false,
//   "explicitlyTrashed": false,
//   "parents": [
//     "0B53Q6OSTWYola296ODZUSm5GYU0"
//   ],
//   "spaces": [
//     "drive"
//   ],
//   "version": "672",
//   "webContentLink": "https://docs.google.com/a/chilkatcloud.com/uc?id=0B53Q6OSTWYolbUF6WS1Gei1oalk&export=download",
//   "webViewLink": "https://drive.google.com/a/chilkatcloud.com/file/d/0B53Q6OSTWYolbUF6WS1Gei1oalk/view?usp=drivesdk",
//   "iconLink": "https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png",
//   "thumbnailLink": "https://lh5.googleusercontent.com/uIV1dJdc8vsAQzaaIInpc9AV55AcdHhpM7fQeI2RN2qbCSnhjK9IDdNQAOTtkvjS9ZObqw=s220",
//   "viewedByMe": true,
//   "viewedByMeTime": "2016-10-08T12:38:02.258Z",
//   "createdTime": "2016-10-08T12:38:02.258Z",
//   "modifiedTime": "2016-10-08T12:38:02.258Z",
//   "modifiedByMeTime": "2016-10-08T12:38:02.258Z",
//   "owners": [
//     {
//       "kind": "drive#user",
//       "displayName": "Matthew Smith",
//       "me": true,
//       "permissionId": "08366696655122259092",
//       "emailAddress": "support@chilkatcloud.com"
//     }
//   ],
//   "lastModifyingUser": {
//     "kind": "drive#user",
//     "displayName": "Matthew Smith",
//     "me": true,
//     "permissionId": "08366696655122259092",
//     "emailAddress": "support@chilkatcloud.com"
//   },
//   "shared": false,
//   "ownedByMe": true,
//   "capabilities": {
//     "canEdit": true,
//     "canComment": true,
//     "canShare": true,
//     "canCopy": true,
//     "canReadRevisions": true
//   },
//   "viewersCanCopyContent": true,
//   "writersCanShare": true,
//   "permissions": [
//     {
//       "kind": "drive#permission",
//       "id": "08366696655122259092",
//       "type": "user",
//       "emailAddress": "support@chilkatcloud.com",
//       "role": "owner",
//       "displayName": "Matthew Smith"
//     }
//   ],
//   "originalFilename": "penguins.jpg",
//   "fullFileExtension": "jpg",
//   "fileExtension": "jpg",
//   "md5Checksum": "9d377b10ce778c4938b3c7e2c63a229a",
//   "size": "777835",
//   "quotaBytesUsed": "777835",
//   "headRevisionId": "0B53Q6OSTWYolUUlHVFhHdFlXQ0R1aHZuT0tORTVzc2h5NnZjPQ",
//   "imageMediaMetadata": {
//     "width": 1024,
//     "height": 768,
//     "rotation": 0,
//     "time": "2009:03:12 13:48:35"
//   },
//   "isAppAuthorized": false
// }

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

// Show the full JSON response.
json.EmitCompact = NO;
NSLog(@"%@",[json Emit]);
NSLog(@"%@",@"-");

// Demonstrate how to get pieces of information:
NSLog(@"%@%@",@"Original Filename: ",[json StringOf: @"originalFilename"]);

BOOL wasLastModifiedUserMe = [json BoolOf: @"lastModifyingUser.me"];
NSLog(@"%@%d",@"Was Last Modified by Me: ",wasLastModifiedUserMe);

// Assuming this is an image file...
int width = [[json IntOf: @"imageMediaMetadata.width"] intValue];
NSLog(@"%@%d",@"Image Width: ",width);

// Iterate over parents...
int i;
int numParents = [[json SizeOfArray: @"parents"] intValue];
i = 0;
while (i < numParents) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%d%@%@",@"Parent ",i,@": ",[json StringOf: @"parents[i]"]);
    i = i + 1;
}

// Iterate over owners...
int numOwners = [[json SizeOfArray: @"owners"] intValue];
i = 0;
while (i < numOwners) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%d%@%@%@%@",@"Owner ",i,@": kind=",[json StringOf: @"owners[i].kind"],@" displayName=",[json StringOf: @"owners[i].displayName"]);
    i = i + 1;
}

// Iterate over permissions...
int numPermissions = [[json SizeOfArray: @"permissions"] intValue];
i = 0;
while (i < numPermissions) {
    json.I = [NSNumber numberWithInt: i];
    NSLog(@"%@%d%@%@%@%@",@"Permission ",i,@": kind=",[json StringOf: @"permissions[i].kind"],@" id=",[json StringOf: @"permissions[i].id"]);
    i = i + 1;
}