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 // Copyright (c) 2006, Google Inc.

 // All rights reserved.

 //

 // Redistribution and use in source and binary forms, with or without

 // modification, are permitted provided that the following conditions are

 // met:

 //

 //     * Redistributions of source code must retain the above copyright

 // notice, this list of conditions and the following disclaimer.

 //     * Redistributions in binary form must reproduce the above

 // copyright notice, this list of conditions and the following disclaimer

 // in the documentation and/or other materials provided with the

 // distribution.

 //     * Neither the name of Google Inc. nor the names of its

 // contributors may be used to endorse or promote products derived from

 // this software without specific prior written permission.

 //

 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #import "HTTPMultipartUpload.h"

 #import "GTMDefines.h"

 @interface HTTPMultipartUpload(PrivateMethods)

 - (NSString *)multipartBoundary;

 // Each of the following methods will append the starting multipart boundary,

 // but not the ending one.

 - (NSData *)formDataForKey:(NSString *)key value:(NSString *)value;

 - (NSData *)formDataForFileContents:(NSData *)contents name:(NSString *)name;

 - (NSData *)formDataForFile:(NSString *)file name:(NSString *)name;

 @end

 @implementation HTTPMultipartUpload

 //=============================================================================

 #pragma mark -

 #pragma mark || Private ||

 //=============================================================================

 - (NSString *)multipartBoundary {

   // The boundary has 27 '-' characters followed by 16 hex digits

   return [NSString stringWithFormat:@"---------------------------%08X%08X",

     rand(), rand()];

 }

 //=============================================================================

 - (NSData *)formDataForKey:(NSString *)key value:(NSString *)value {

   NSString *escaped =

     [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

   NSString *fmt =

     @"--%@\r\nContent-Disposition: form-data; name=\"%@\"\r\n\r\n%@\r\n";

   NSString *form = [NSString stringWithFormat:fmt, boundary_, escaped, value];

   return [form dataUsingEncoding:NSUTF8StringEncoding];

 }

 //=============================================================================

 - (NSData *)formDataForFileContents:(NSData *)contents name:(NSString *)name {

   NSMutableData *data = [NSMutableData data];

   NSString *escaped =

     [name stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

   NSString *fmt = @"--%@\r\nContent-Disposition: form-data; name=\"%@\"; "

     "filename=\"minidump.dmp\"\r\nContent-Type: application/octet-stream\r\n\r\n";

   NSString *pre = [NSString stringWithFormat:fmt, boundary_, escaped];

   [data appendData:[pre dataUsingEncoding:NSUTF8StringEncoding]];

   [data appendData:contents];

   return data;

 }

 //=============================================================================

 - (NSData *)formDataForFile:(NSString *)file name:(NSString *)name {

   NSData *contents = [NSData dataWithContentsOfFile:file];

   return [self formDataForFileContents:contents name:name];

 }

 //=============================================================================

 #pragma mark -

 #pragma mark || Public ||

 //=============================================================================

 - (id)initWithURL:(NSURL *)url {

   if ((self = [super init])) {

     url_ = [url copy];

     boundary_ = [[self multipartBoundary] retain];

     files_ = [[NSMutableDictionary alloc] init];

   }

   return self;

 }

 //=============================================================================

 - (void)dealloc {

   [url_ release];

   [parameters_ release];

   [files_ release];

   [boundary_ release];

   [response_ release];

   [super dealloc];

 }

 //=============================================================================

 - (NSURL *)URL {

   return url_;

 }

 //=============================================================================

 - (void)setParameters:(NSDictionary *)parameters {

   if (parameters != parameters_) {

     [parameters_ release];

     parameters_ = [parameters copy];

   }

 }

 //=============================================================================

 - (NSDictionary *)parameters {

   return parameters_;

 }

 //=============================================================================

 - (void)addFileAtPath:(NSString *)path name:(NSString *)name {

   [files_ setObject:path forKey:name];

 }

 //=============================================================================

 - (void)addFileContents:(NSData *)data name:(NSString *)name {

   [files_ setObject:data forKey:name];

 }

 //=============================================================================

 - (NSDictionary *)files {

   return files_;

 }

 //=============================================================================

 - (NSData *)send:(NSError **)error {

   NSMutableURLRequest *req = 

     [[NSMutableURLRequest alloc]

           initWithURL:url_ cachePolicy:NSURLRequestUseProtocolCachePolicy

       timeoutInterval:10.0 ];

   NSMutableData *postBody = [NSMutableData data];

   [req setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@",

     boundary_] forHTTPHeaderField:@"Content-type"];

   // Add any parameters to the message

   NSArray *parameterKeys = [parameters_ allKeys];

   NSString *key;

   NSInteger count = [parameterKeys count];

   for (NSInteger i = 0; i < count; ++i) {

     key = [parameterKeys objectAtIndex:i];

     [postBody appendData:[self formDataForKey:key

                                         value:[parameters_ objectForKey:key]]];

   }

   // Add any files to the message

   NSArray *fileNames = [files_ allKeys];

   count = [fileNames count];

   for (NSInteger i = 0; i < count; ++i) {

     NSString *name = [fileNames objectAtIndex:i];

     id fileOrData = [files_ objectForKey:name];

     NSData *fileData;

     // The object can be either the path to a file (NSString) or the contents

     // of the file (NSData).

     if ([fileOrData isKindOfClass:[NSData class]])

       fileData = [self formDataForFileContents:fileOrData name:name];

     else

       fileData = [self formDataForFile:fileOrData name:name];

     [postBody appendData:fileData];

   }

   NSString *epilogue = [NSString stringWithFormat:@"\r\n--%@--\r\n", boundary_];

   [postBody appendData:[epilogue dataUsingEncoding:NSUTF8StringEncoding]];

   [req setHTTPBody:postBody];

   [req setHTTPMethod:@"POST"];

   [response_ release];

   response_ = nil;

   NSData *data =  [NSURLConnection sendSynchronousRequest:req

                                returningResponse:&response_

                                            error:error];

   [response_ retain];

   [req release];

   return data;

 }

 //=============================================================================

 - (NSHTTPURLResponse *)response {

   return response_;

 }

 @end