断点续传队列和本地持久化(iOS源码)

//
//  ASIFormDataRequest.m
//  Part of ASIHTTPRequest -> http://allseeing-i.com/ASIHTTPRequest
//
//  Created by Ben Copsey on 07/11/2008.
//  Copyright 2008-2009 All-Seeing Interactive. All rights reserved.
//

#import "ASIFormDataRequest.h"


// Private stuff
@interface ASIFormDataRequest ()
- (void)buildMultipartFormDataPostBody;
- (void)buildURLEncodedPostBody;
- (void)appendPostString:(NSString *)string;

@property (retain) NSMutableArray *postData;
@property (retain) NSMutableArray *fileData;

#if DEBUG_FORM_DATA_REQUEST
- (void)addToDebugBody:(NSString *)string;
@property (retain, nonatomic) NSString *debugBodyString;
#endif

@end

@implementation ASIFormDataRequest

#pragma mark utilities
- (NSString*)encodeURL:(NSString *)string
{
    NSString *newString = [NSMakeCollectable(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &‘()*+,;=\"<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding([self stringEncoding]))) autorelease];
    if (newString) {
        return newString;
    }
    return @"";
}

#pragma mark init / dealloc

+ (id)requestWithURL:(NSURL *)newURL
{
    return [[[self alloc] initWithURL:newURL] autorelease];
}

- (id)initWithURL:(NSURL *)newURL
{
    self = [super initWithURL:newURL];
    [self setPostFormat:ASIURLEncodedPostFormat];
    [self setStringEncoding:NSUTF8StringEncoding];
        [self setRequestMethod:@"POST"];
    return self;
}

- (void)dealloc
{
#if DEBUG_FORM_DATA_REQUEST
    [debugBodyString release]; 
#endif
    
    [postData release];
    [fileData release];
    [super dealloc];
}

#pragma mark setup request

- (void)addPostValue:(id <NSObject>)value forKey:(NSString *)key
{
    if (!key) {
        return;
    }
    if (![self postData]) {
        [self setPostData:[NSMutableArray array]];
    }
    NSMutableDictionary *keyValuePair = [NSMutableDictionary dictionaryWithCapacity:2];
    [keyValuePair setValue:key forKey:@"key"];
    [keyValuePair setValue:[value description] forKey:@"value"];
    [[self postData] addObject:keyValuePair];
}

- (void)setPostValue:(id <NSObject>)value forKey:(NSString *)key
{
    // Remove any existing value
    NSUInteger i;
    for (i=0; i<[[self postData] count]; i++) {
        NSDictionary *val = [[self postData] objectAtIndex:i];
        if ([[val objectForKey:@"key"] isEqualToString:key]) {
            [[self postData] removeObjectAtIndex:i];
            i--;
        }
    }
    [self addPostValue:value forKey:key];
}


- (void)addFile:(NSString *)filePath forKey:(NSString *)key
{
    [self addFile:filePath withFileName:nil andContentType:nil forKey:key];
}

- (void)addFile:(NSString *)filePath withFileName:(NSString *)fileName andContentType:(NSString *)contentType forKey:(NSString *)key
{
    BOOL isDirectory = NO;
    BOOL fileExists = [[[[NSFileManager alloc] init] autorelease] fileExistsAtPath:filePath isDirectory:&isDirectory];
    if (!fileExists || isDirectory) {
        [self failWithError:[NSError errorWithDomain:NetworkRequestErrorDomain code:ASIInternalErrorWhileBuildingRequestType userInfo:[NSDictionary dictionaryWithObjectsAndKeys:[NSString stringWithFormat:@"No file exists at %@",filePath],NSLocalizedDescriptionKey,nil]]];
    }

    // If the caller didn‘t specify a custom file name, we‘ll use the file name of the file we were passed
    if (!fileName) {
        fileName = [filePath lastPathComponent];
    }

    // If we were given the path to a file, and the user didn‘t specify a mime type, we can detect it from the file extension
    if (!contentType) {
        contentType = [ASIHTTPRequest mimeTypeForFileAtPath:filePath];
    }
    [self addData:filePath withFileName:fileName andContentType:contentType forKey:key];
}

- (void)setFile:(NSString *)filePath forKey:(NSString *)key
{
    [self setFile:filePath withFileName:nil andContentType:nil forKey:key];
}

- (void)setFile:(id)data withFileName:(NSString *)fileName andContentType:(NSString *)contentType forKey:(NSString *)key
{
    // Remove any existing value
    NSUInteger i;
    for (i=0; i<[[self fileData] count]; i++) {
        NSDictionary *val = [[self fileData] objectAtIndex:i];
        if ([[val objectForKey:@"key"] isEqualToString:key]) {
            [[self fileData] removeObjectAtIndex:i];
            i--;
        }
    }
    [self addFile:data withFileName:fileName andContentType:contentType forKey:key];
}

- (void)addData:(NSData *)data forKey:(NSString *)key
{
    [self addData:data withFileName:@"file" andContentType:nil forKey:key];
}

- (void)addData:(id)data withFileName:(NSString *)fileName andContentType:(NSString *)contentType forKey:(NSString *)key
{
    if (![self fileData]) {
        [self setFileData:[NSMutableArray array]];
    }
    if (!contentType) {
        contentType = @"application/octet-stream";
    }

    NSMutableDictionary *fileInfo = [NSMutableDictionary dictionaryWithCapacity:4];
    [fileInfo setValue:key forKey:@"key"];
    [fileInfo setValue:fileName forKey:@"fileName"];
    [fileInfo setValue:contentType forKey:@"contentType"];
    [fileInfo setValue:data forKey:@"data"];

    [[self fileData] addObject:fileInfo];
}

- (void)setData:(NSData *)data forKey:(NSString *)key
{
    [self setData:data withFileName:@"file" andContentType:nil forKey:key];
}

- (void)setData:(id)data withFileName:(NSString *)fileName andContentType:(NSString *)contentType forKey:(NSString *)key
{
    // Remove any existing value
    NSUInteger i;
    for (i=0; i<[[self fileData] count]; i++) {
        NSDictionary *val = [[self fileData] objectAtIndex:i];
        if ([[val objectForKey:@"key"] isEqualToString:key]) {
            [[self fileData] removeObjectAtIndex:i];
            i--;
        }
    }
    [self addData:data withFileName:fileName andContentType:contentType forKey:key];
}

- (void)buildPostBody
{
    if ([self haveBuiltPostBody]) {
        return;
    }
    
#if DEBUG_FORM_DATA_REQUEST
    [self setDebugBodyString:@""];    
#endif
    
    if (![self postData] && ![self fileData]) {
        [super buildPostBody];
        return;
    }    
    if ([[self fileData] count] > 0) {
        [self setShouldStreamPostDataFromDisk:YES];
    }
    
    if ([self postFormat] == ASIURLEncodedPostFormat) {
        [self buildURLEncodedPostBody];
    } else {
        [self buildMultipartFormDataPostBody];
    }

    [super buildPostBody];
    
#if DEBUG_FORM_DATA_REQUEST
    ASI_DEBUG_LOG(@"%@",[self debugBodyString]);
    [self setDebugBodyString:nil];
#endif
}


- (void)buildMultipartFormDataPostBody
{
#if DEBUG_FORM_DATA_REQUEST
    [self addToDebugBody:@"\r\n==== Building a multipart/form-data body ====\r\n"];
#endif
    
    NSString *charset = (NSString *)CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding([self stringEncoding]));
    
    // We don‘t bother to check if post data contains the boundary, since it‘s pretty unlikely that it does.
    CFUUIDRef uuid = CFUUIDCreate(nil);
    NSString *uuidString = [(NSString*)CFUUIDCreateString(nil, uuid) autorelease];
    CFRelease(uuid);
    NSString *stringBoundary = [NSString stringWithFormat:@"0xKhTmLbOuNdArY-%@",uuidString];
    
    [self addRequestHeader:@"Content-Type" value:[NSString stringWithFormat:@"multipart/form-data; charset=%@; boundary=%@", charset, stringBoundary]];
    
    [self appendPostString:[NSString stringWithFormat:@"--%@\r\n",stringBoundary]];
    
    // Adds post data
    NSString *endItemBoundary = [NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary];
    NSUInteger i=0;
    for (NSDictionary *val in [self postData]) {
        [self appendPostString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",[val objectForKey:@"key"]]];
        [self appendPostString:[val objectForKey:@"value"]];
        i++;
        if (i != [[self postData] count] || [[self fileData] count] > 0) { //Only add the boundary if this is not the last item in the post body
            [self appendPostString:endItemBoundary];
        }
    }
    
    // Adds files to upload
    i=0;
    for (NSDictionary *val in [self fileData]) {

        [self appendPostString:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n", [val objectForKey:@"key"], [val objectForKey:@"fileName"]]];
        [self appendPostString:[NSString stringWithFormat:@"Content-Type: %@\r\n\r\n", [val objectForKey:@"contentType"]]];
        
        id data = [val objectForKey:@"data"];
        if ([data isKindOfClass:[NSString class]]) {
            [self appendPostDataFromFile:data];
        } else {
            [self appendPostData:data];
        }
        i++;
        // Only add the boundary if this is not the last item in the post body
        if (i != [[self fileData] count]) { 
            [self appendPostString:endItemBoundary];
        }
    }
    
    [self appendPostString:[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary]];
    
#if DEBUG_FORM_DATA_REQUEST
    [self addToDebugBody:@"==== End of multipart/form-data body ====\r\n"];
#endif
}

- (void)buildURLEncodedPostBody
{

    // We can‘t post binary data using application/x-www-form-urlencoded
    if ([[self fileData] count] > 0) {
        [self setPostFormat:ASIMultipartFormDataPostFormat];
        [self buildMultipartFormDataPostBody];
        return;
    }
    
#if DEBUG_FORM_DATA_REQUEST
    [self addToDebugBody:@"\r\n==== Building an application/x-www-form-urlencoded body ====\r\n"]; 
#endif
    
    
    NSString *charset = (NSString *)CFStringConvertEncodingToIANACharSetName(CFStringConvertNSStringEncodingToEncoding([self stringEncoding]));

    [self addRequestHeader:@"Content-Type" value:[NSString stringWithFormat:@"application/x-www-form-urlencoded; charset=%@",charset]];

    
    NSUInteger i=0;
    NSUInteger count = [[self postData] count]-1;
    for (NSDictionary *val in [self postData]) {
        NSString *data = [NSString stringWithFormat:@"%@=%@%@", [self encodeURL:[val objectForKey:@"key"]], [self encodeURL:[val objectForKey:@"value"]],(i<count ?  @"&" : @"")]; 
        [self appendPostString:data];
        i++;
    }
#if DEBUG_FORM_DATA_REQUEST
    [self addToDebugBody:@"\r\n==== End of application/x-www-form-urlencoded body ====\r\n"]; 
#endif
}

- (void)appendPostString:(NSString *)string
{
#if DEBUG_FORM_DATA_REQUEST
    [self addToDebugBody:string];
#endif
    [super appendPostData:[string dataUsingEncoding:[self stringEncoding]]];
}

#if DEBUG_FORM_DATA_REQUEST
- (void)appendPostData:(NSData *)data
{
    [self addToDebugBody:[NSString stringWithFormat:@"[%lu bytes of data]",(unsigned long)[data length]]];
    [super appendPostData:data];
}

- (void)appendPostDataFromFile:(NSString *)file
{
    NSError *err = nil;
    unsigned long long fileSize = [[[[[[NSFileManager alloc] init] autorelease] attributesOfItemAtPath:file error:&err] objectForKey:NSFileSize] unsignedLongLongValue];
    if (err) {
        [self addToDebugBody:[NSString stringWithFormat:@"[Error: Failed to obtain the size of the file at ‘%@‘]",file]];
    } else {
        [self addToDebugBody:[NSString stringWithFormat:@"[%llu bytes of data from file ‘%@‘]",fileSize,file]];
    }

    [super appendPostDataFromFile:file];
}

- (void)addToDebugBody:(NSString *)string
{
    if (string) {
        [self setDebugBodyString:[[self debugBodyString] stringByAppendingString:string]];
    }
}
#endif

#pragma mark NSCopying

- (id)copyWithZone:(NSZone *)zone
{
    ASIFormDataRequest *newRequest = [super copyWithZone:zone];
    [newRequest setPostData:[[[self postData] mutableCopyWithZone:zone] autorelease]];
    [newRequest setFileData:[[[self fileData] mutableCopyWithZone:zone] autorelease]];
    [newRequest setPostFormat:[self postFormat]];
    [newRequest setStringEncoding:[self stringEncoding]];
    [newRequest setRequestMethod:[self requestMethod]];
    return newRequest;
}

@synthesize postData;
@synthesize fileData;
@synthesize postFormat;
@synthesize stringEncoding;
#if DEBUG_FORM_DATA_REQUEST
@synthesize debugBodyString;
#endif
@end