够快网盘支持与iOS-ASIHTTPRequest框架学习

够快网盘支持与iOS-ASIHTTPRequest框架学习

前段时间在公司的产品中支持了够快网盘,用于云盘存储。

在这个过程中,学习到了很多新的知识,也遇到了很多问题,在此记录一下。

首先就够快的API总结一下。

一、请求参数中的签名。第一点是生成字符串,例如”2\n3\n1”,在C#中是不需要加上@前置符号的,这是我一个同事犯过的错误。第二点是签名算法,按照原文提示:将生成的字符利用client_secret作为key进行hmac-sha1加密,然后再进行base64 encode,最后对结果进行rfc3986 URL编码,即:encodeURI(base64_encode(hmac-sha1([string], [client_secret])))。OC的代码如下:

- (NSString*)getRequestSign:(NSString*)string
{
const char *cString = [string cStringUsingEncoding:NSUTF8StringEncoding];
const char *cSecret = [kCHRISGoKuaiClientSecret cStringUsingEncoding:NSUTF8StringEncoding]; char cHMAC[CC_SHA1_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA1, cSecret, strlen(cSecret), cString, strlen(cString), cHMAC); NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC length:CC_SHA1_DIGEST_LENGTH];
NSString *hash = [HMAC base64Encoding];
[HMAC release]; NSString *sign = (NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)hash, NULL, (CFStringRef)@"!*'();:@&=+$,/?%#[]", kCFStringEncodingUTF8);
return sign;
}

在此,需要先添加头文件引用:

#import <CommonCrypto/CommonHMAC.h>和#import <CommonCrypto/CommonCryptor.h>

二、删除和上传api中的路径参数。对象若为文件,则api中路径参数需要去掉首尾的”/”符号;对象若为文件夹,则api中需要在上述基础上,再在末尾加上一个”/”符号。

保存access_token

在得到用户的access_token、expires_in、refresh_token以后,可以保存到设备端,避免繁琐的登陆授权操作。采用NSUserDefaults是不安全的,证书和密码之类的私密信息需要更为安全的keychain来保存。封装的keychain如下:

#import <Foundation/Foundation.h>

@interface CHRISKeyChain : NSObject

@property (readwrite, nonatomic, retain) NSDictionary* keyChainDic;

+ (id)keyChainForId:(NSString*)keyChainId;

- (NSDictionary *)credentials;

- (void)setCredentials:(NSDictionary *)credentials;

- (void)deleteCredentials;
@end
#import "CHRISKeyChain.h"

static NSMutableDictionary* g_keyChainDic = nil;

@implementation CHRISKeyChain
@synthesize keyChainDic = _keyChainDic; + (id)keyChainForId:(NSString*)keyChainId
{
if (!g_keyChainDic)
{
g_keyChainDic = [[NSMutableDictionary dictionary] retain];
}
CHRISKeyChain* keyChainObject = [g_keyChainDic objectForKey:keyChainId];
if (!keyChainObject)
{
NSDictionary* keyChainDict = [NSDictionary dictionaryWithObjectsAndKeys:
(id)kSecClassGenericPassword, (id)kSecClass,
keyChainId, (id)kSecAttrService, nil];
keyChainObject = [[[CHRISKeyChain alloc] init] autorelease];
keyChainObject.keyChainDic = keyChainDict;
[g_keyChainDic setObject:keyChainObject forKey:keyChainId];
return keyChainObject;
}
return keyChainObject;
} - (void)dealloc
{
self.keyChainDic = nil;
[super dealloc];
} - (NSDictionary *)credentials
{
NSMutableDictionary *searchDict = [NSMutableDictionary dictionaryWithDictionary:_keyChainDic];
[searchDict setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
[searchDict setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnAttributes];
[searchDict setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData]; NSDictionary *attrDict = nil;
OSStatus status = SecItemCopyMatching((CFDictionaryRef)searchDict, (CFTypeRef *)&attrDict);
[attrDict autorelease];
NSData *foundValue = [attrDict objectForKey:(id)kSecValueData]; if (status == noErr && foundValue)
{
return [NSKeyedUnarchiver unarchiveObjectWithData:foundValue];
}
if (status != errSecItemNotFound)
{
NSLog(@"error reading stored credentials (%ld)", status);
}
return nil;
} - (void)setCredentials:(NSDictionary *)credentials
{
NSData *credentialData = [NSKeyedArchiver archivedDataWithRootObject:credentials]; NSMutableDictionary *attrDict = [NSMutableDictionary dictionaryWithDictionary:_keyChainDic];
[attrDict setObject:credentialData forKey:(id)kSecValueData]; NSArray *version = [[[UIDevice currentDevice] systemVersion] componentsSeparatedByString:@"."];
if ([[version objectAtIndex:] intValue] >= ) {
[attrDict setObject:(id)kSecAttrAccessibleWhenUnlocked forKey:(id)kSecAttrAccessible];
} OSStatus status = noErr; if ([self credentials])
{
[attrDict removeObjectForKey:(id)kSecClass];
status = SecItemUpdate((CFDictionaryRef)_keyChainDic, (CFDictionaryRef)attrDict);
}
else
{
status = SecItemAdd((CFDictionaryRef)attrDict, NULL);
} if (status != noErr)
{
NSLog(@"error saving credentials (%ld)", status);
}
} - (void)deleteCredentials
{
OSStatus status = SecItemDelete((CFDictionaryRef)_keyChainDic); if (status != noErr)
{
NSLog(@"error deleting credentials (%ld)", status);
}
} @end

够快网盘之ASIHTTPRequest框架。

         既然是网盘,必然涉及文件上传和下载等网络请求,这里采用了ASIHTTPRequest框架来实现网络请求和文件的上传、下载。

一、够快网盘的下载api采用get方式:

ASIHTTPRequest* request = [ASIHTTPRequest requestWithURL: url];
[request setCompletionBlock:^{
NSDictionary* params = [request.responseString objectFromJSONString];
....
}];
[request setFailedBlock:^{…}];
[request setStartedBlock:^{…}];
[request setBytesReceivedBlock:^(unsigned long long size, unsigned long long total){
Meta.synProgress =( (double)request.totalBytesRead + request.partialDownloadSize) / total;
}];
[request setDownloadDestinationPath: filePath];
[request setAllowCompressedResponse: NO];
[request setAllowResumeForFileDownloads: YES];
[request setShouldPresentCredentialsBeforeChallenge: YES];
[request setShowAccurateProress: YES];
[request startAsynchronous];

说明:url为NSURL对象;filePath为本地存储路径;BytesReceivedBlock可以用来显示当前下载进度的百分比。objectFromJSONString方法需要先添加JSONKit并引用头文件。

二、够快网盘的上传api步骤2采用了post multipart/form-data方式:

ASIFormDataRequest* request = [ASIHTTPRequest requestWithURL: url];
[request setPostValue: … forKey: …];
…..
[request setPostValue: @”file” forKey: @”filefield”];
request.requestMethod = @”POST”;
[request addRequestHeader:@”Content-Type” value:@”Multipart/form-data”]
[request setCompletionBlock:^{
NSDictionary* params = [request.responseString objectFromJSONString];
…..
}];
[request setFailedBlock:^{….}];
[request setStartedBlock:^{…..}];
[request setBytesReceivedBlock:^(unsigned long long size, unsigned long long total){
Meta.synProgress =( (double)request.totalBytesSent )/ total;
}];
[request setDownloadDestinationPath: filePath];
[request setAllowCompressedResponse: NO];
[request setAllowResumeForFileDownloads: YES];
[request setShouldPresentCredentialsBeforeChallenge: YES];
[request setShowAccurateProress: YES];
[request setShouldStreamPostFromDisk: YES];
[request setFile: localPath withFileName: [meta.path lastPathComponent] andContentType: meta.contentType forKey: @”file”];
[request startAsynchronous];

说明:[request setPostValue: @”file” forKey: @”filefield”];中的value必须和后面的forKey一致,这也符合api最后一个参数的说明。

当然还有其他方面,比如之前删除和上传没有成功,但是状态码返回200,经过与够快的开发人员一番沟通,发现了这两个api的缺陷,现在已经完善了,不会再遇到。

通过对够快网盘的支持,我也进一步学习了iOS的网络编程,收获还是很多的。

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