(Objective-C) Box.com Streaming Upload File

Demonstrates how to upload a file to box.com, streaming the file directly from the filesystem.

Note: This example requires a fix that is included in Chilkat v9.5.0.70 and above.

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#import <CkoRest.h>
#import <CkoOAuth2.h>
#import <CkoJsonObject.h>
#import <CkoStream.h>
#import <NSString.h>

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

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

//   Provide a previously obtained OAuth2 access token.
CkoOAuth2 *oauth2 = [[CkoOAuth2 alloc] init];
oauth2.AccessToken = @"BOX_ACCESS_TOKEN";
[rest SetAuthOAuth2: oauth2];

// First, make the initial connection.
// A single REST object, once connected, can be used for many Box 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;

// ----------------------------------------------------------------------
// IMPORTANT: Note that the domain is "upload.box.com", not "api.box.com"
// ----------------------------------------------------------------------
success = [rest Connect: @"upload.box.com" port: [NSNumber numberWithInt: 443] tls: YES autoReconnect: bAutoReconnect];
if (success != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// The request body uses the "multipart/form-data" format to transmit two "parts". 
// The first part is called "attributes" and contains a JSON object with information about the file, including the name of the file 
// and the ID of the parent folder. The second part contains the contents of the file. 
// (Note that the name of the second "part" is ignored.)

[rest AddHeader: @"Content-Type" value: @"multipart/form-data"];

// Provide the content for each part of the request...

// First the JSON attributes.  Use "0" for the root folder.
//   {"name":"hedgehogs.jpg", "parent":{"id":"0"}}
CkoJsonObject *jsonAttr = [[CkoJsonObject alloc] init];
[jsonAttr UpdateString: @"name" value: @"hedgehogs.jpg"];
[jsonAttr UpdateString: @"parent.id" value: @"0"];

rest.PartSelector = @"1";
[rest AddHeader: @"Content-Disposition" value: @"form-data; name=\"attributes\"; "];
[rest SetMultipartBodyString: [jsonAttr Emit]];

// The upload will stream directly from a file.
rest.PartSelector = @"2";
[rest AddHeader: @"Content-Disposition" value: @"form-data; name=\"file\"; filename=\"hedgehogs.jpg\""];
// "application/octet-stream" can be safely used for any type file..
[rest AddHeader: @"Content-Type" value: @"application/octet-stream"];

// IMPORTANT: This example requires Chilkat v9.5.0.70 or later, for a fix that was made in
// multipart/streaming uploads. 
CkoStream *fileStream = [[CkoStream alloc] init];
fileStream.SourceFile = @"qa_data/jpg/hedgehogs.jpg";
[rest SetMultipartBodyStream: fileStream];

// Restore the PartSelector to "0" (for safety, in case something else sends another request on this object)
rest.PartSelector = @"0";

// Send the multipart/form-data request, which uploads the file by streaming directly from the filesystem.
NSString *responseBody = [rest FullRequestMultipart: @"POST" uriPath: @"/api/2.0/files/content"];
if (rest.LastMethodSuccess != YES) {
    NSLog(@"%@",rest.LastErrorText);
    return;
}

// A 201 is received for a successful upload
if ([rest.ResponseStatusCode intValue] != 201) {
    NSLog(@"%@",@"Box.com upload failed.");
    NSLog(@"%@",@"Request header:");
    NSLog(@"%@",rest.LastRequestHeader);
    NSLog(@"%@",@"---");
    NSLog(@"%@%d",@"Response status code = ",[rest.ResponseStatusCode intValue]);
    NSLog(@"%@",@"Response body:");
    NSLog(@"%@",responseBody);
    return;
}

NSLog(@"%@",@"File uploaded.");