IRWebAPIKit/IRWebAPIEngine+FormMultipart.m at develop · iridia/IRWebAPIKit · GitHub

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//
//  IRWebAPIEngine+FormMultipart.m
//  IRWebAPIKit
//
//  Created by Evadne Wu on 1/23/11.
//  Copyright 2011 Iridia Productions. All rights reserved.
//

#import "IRWebAPIEngine+FormMultipart.h"

#import "IRWebAPIEngine+LocalCaching.h"

NSString * const kIRWebAPIEngineRequestContextFormMultipartFieldsKey = @"kIRWebAPIEngineRequestContextFormMultipartFieldsKey";

@implementation IRWebAPIEngine (FormMultipart)

+ (IRWebAPIRequestContextTransformer) defaultFormMultipartTransformer {

	return [[(^ (NSDictionary *inOriginalContext) {

		NSDictionary *formNamesToContents = [inOriginalContext objectForKey:kIRWebAPIEngineRequestContextFormMultipartFieldsKey];

		if(!formNamesToContents || ([formNamesToContents count] == 0))
		return inOriginalContext;

		NSMutableDictionary *returnedContext = [[inOriginalContext mutableCopy] autorelease];

		NSError *error;
		NSURL *fileHandleURL = [[[self class] newTemporaryFileURL] autorelease];

		if (![[NSFileManager defaultManager] createFileAtPath:[fileHandleURL path] contents:[NSData data] attributes:nil]) {

			NSLog(@"Error creating file for URL %@.", fileHandleURL);
			return (NSDictionary *)returnedContext;

		}

		NSFileHandle *fileHandle = [NSFileHandle fileHandleForWritingToURL:fileHandleURL error:&error];
		if (!fileHandle) {

			NSLog(@"Error grabbing file handle for URL %@: %@", fileHandleURL, error);
			return (NSDictionary *)returnedContext;

		}

		[fileHandle truncateFileAtOffset:0];
		[fileHandle seekToEndOfFile];


		NSMutableDictionary *headerFields = [returnedContext objectForKey:kIRWebAPIEngineRequestHTTPHeaderFields];
		if (!headerFields) {

			headerFields = [NSMutableDictionary dictionary];
			[returnedContext setObject:headerFields forKey:kIRWebAPIEngineRequestHTTPHeaderFields];

		}

		[headerFields setObject:@"8bit" forKey:@"Content-Transfer-Encoding"];


		NSString *mineBoundary = [NSString stringWithFormat:@"----_=_%@_%@_%@_=_----",

			NSStringFromClass([self class]),
			[[NSBundle mainBundle] bundleIdentifier],
			IRWebAPIKitNonce()

		];

		NSData *boundaryData = [mineBoundary dataUsingEncoding:NSUTF8StringEncoding];
		NSData *newLineData = [@"\r\n" dataUsingEncoding:NSUTF8StringEncoding];
		NSData *separatorData = [@"--" dataUsingEncoding:NSUTF8StringEncoding];

		[headerFields setObject:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", mineBoundary] forKey:@"Content-Type"];

		//	Start writing

		for (id incomingFormName in formNamesToContents) {

		//	--<BOUNDARY> ↵
			[fileHandle writeData:separatorData];
			[fileHandle writeData:boundaryData];
			[fileHandle writeData:newLineData];

			id incomingObject = [formNamesToContents objectForKey:incomingFormName];
			if ([incomingObject isKindOfClass:[NSString class]]) {

			//	Append contents of string

				[fileHandle writeData:[[NSString stringWithFormat:

					@"Content-Disposition: form-data; name=\"%@\"",
					incomingFormName

				] dataUsingEncoding:NSUTF8StringEncoding]];

				[fileHandle writeData:newLineData];
				[fileHandle writeData:newLineData];

				[fileHandle writeData:[(NSString *)incomingObject dataUsingEncoding:NSUTF8StringEncoding]];

			} else if ([incomingObject isKindOfClass:[NSURL class]]) {

			//	Append contents of file

				[fileHandle writeData:[[NSString stringWithFormat:

					@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"",
					incomingFormName,
					[[(NSURL *)incomingObject path] lastPathComponent]

				] dataUsingEncoding:NSUTF8StringEncoding]];

				[fileHandle writeData:newLineData];


				NSString *mimeType = IRWebAPIKitMIMETypeOfExtension([[[(NSURL *)incomingObject path] lastPathComponent] pathExtension]);

				[fileHandle writeData:[[NSString stringWithFormat:

					@"Content-Type: %@", (mimeType ? mimeType : @"application/octet-stream")

				] dataUsingEncoding:NSUTF8StringEncoding]];

				[fileHandle writeData:newLineData];
				[fileHandle writeData:newLineData];

				[fileHandle writeData:[NSData dataWithContentsOfMappedFile:[(NSURL *)incomingObject path]]];

			} else if ([incomingObject isKindOfClass:[NSData class]]) {

				[fileHandle writeData:(NSData *)incomingObject];

			} else {

				NSAssert(NO, @"%s Can’t understand incoming object %@", __PRETTY_FUNCTION__, incomingObject);

			}

			[fileHandle writeData:newLineData];

		}

	//	--<BOUNDARY>-- ↵
		[fileHandle writeData:separatorData];
		[fileHandle writeData:boundaryData];
		[fileHandle writeData:separatorData];
		[fileHandle writeData:newLineData];

		[fileHandle closeFile];

		[returnedContext setObject:[NSData dataWithContentsOfMappedFile:[fileHandleURL path]] forKey:kIRWebAPIEngineRequestHTTPBody];


		NSMutableArray *temporaryFileURLs = [returnedContext objectForKey:kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey];
		if (!temporaryFileURLs) {

			temporaryFileURLs = [NSMutableArray array];
			[returnedContext setObject:temporaryFileURLs forKey:kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey];

		}

		[temporaryFileURLs addObject:fileHandleURL];

		[returnedContext setObject:temporaryFileURLs forKey:kIRWebAPIEngineRequestContextLocalCachingTemporaryFileURLsKey];
		[returnedContext removeObjectForKey:kIRWebAPIEngineRequestContextFormMultipartFieldsKey];
		[returnedContext setObject:@"POST" forKey:kIRWebAPIEngineRequestHTTPMethod];

		return (NSDictionary *)returnedContext;

	}) copy] autorelease];

}

@end