(Objective-C) Lookup Google Drive Folder ID Given a Folder Path

Demonstrates how to find the Google Drive folder ID given a Folder Path.

This example demonstrates that we cannot simply query by folder name. (We can if every folder name is unique, but if not...) For example, imagine we have the following directory structure on Google Drive:

/AAWorkArea
/AAWorkArea/FolderA
/AAWorkArea/FolderB
/Folder2
/Folder2/FolderA

There are two directories named "FolderA". One is contained within AAWorkArea, and one is contained within "Folder2". To say it differently: One has the parent "AAWorkArea" and the other's parent is "Folder2".

To find the id of "/AAWorkArea/FolderA", we need to first find the id for "AAWorkArea", and then find the id for the folder with name="FolderA" and with AAWorkArea's id in FolderA's parents.

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#import <CkoAuthGoogle.h>
#import <CkoRest.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoStringBuilder.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];

CkoJsonObject *json = [[CkoJsonObject alloc] init];
json.EmitCompact = NO;

// Get the AAWorkArea folder that is in the Google Drive root.
[rest AddQueryParam: @"q" value: @"'root' in parents and name='AAWorkArea'"];
NSString *jsonResponse = [rest FullRequestNoBody: @"GET" uriPath: @"/drive/v3/files"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

[json Load: jsonResponse];
NSLog(@"%@",[json Emit]);
NSLog(@"%@%@",@"name: ",[json StringOf: @"files[0].name"]);
NSLog(@"%@%@",@"id: ",[json StringOf: @"files[0].id"]);
NSLog(@"%@%@",@"mimeType: ",[json StringOf: @"files[0].mimeType"]);
NSLog(@"%@",@"-");

[rest ClearAllQueryParams];

// Now that we know the ID for the AAWorkarea directory, get the id for the FolderA having AAWorkArea as the parent.
CkoStringBuilder *sbQuery = [[CkoStringBuilder alloc] init];
[sbQuery Append: @"name = 'FolderA' and '"];
[sbQuery Append: [json StringOf: @"files[0].id"]];
[sbQuery Append: @"' in parents"];
[rest AddQueryParamSb: @"q" value: sbQuery];

jsonResponse = [rest FullRequestNoBody: @"GET" uriPath: @"/drive/v3/files"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

[json Load: jsonResponse];
NSLog(@"%@",[json Emit]);
NSLog(@"%@%@",@"name: ",[json StringOf: @"files[0].name"]);
NSLog(@"%@%@",@"id: ",[json StringOf: @"files[0].id"]);
NSLog(@"%@%@",@"mimeType: ",[json StringOf: @"files[0].mimeType"]);
NSLog(@"%@",@"-");