阿里云osssdkforios

做过太多 网站 了，当然，都是传统的。虽然跟 阿里云 结缘有两年多了，但一直都拿ecs做普通 服务器 用，真正所谓的 云服务 ，基本没涉及过，哎，菜鸟啊…… 新的项目用到了 oss ，我相信很多人都会很纳闷，阿里云官方是没有提供oss-for-IOS的 SDK 的。而我本人之前也没有接触过 IOS 开发 ，一时各种蛋疼，各种研究！ 总算有些眉目了，由于是IOS 0基础的人，就不卖弄来写什么封装好的sdk了，只提供个思路，各路大侠该骂使劲骂…… MD，废话太多了，入主题： 基于AFN来做的话，只需要做好request的header管理就OK。语文不行，尼玛，不知道怎么写，上代码：
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1. #import <CommonCrypto/CommonHMAC.h>
2. /**
3. * 获取 authorization 所要求的 HMACSHA1
4. * @param string 按照OSS文档将HTTPHeaders拼接出来的字符串
5. * @param key ALIYUN_ACCESS_KEY
6. * @return NSData
7. */
8. static NSData * AFHMACSHA1EncodedDataFromStringWithKey(NSString *string, NSString *key) {
9.     NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding];
10.     CCHmacContext context;
11.     const char *keyCString = [key cStringUsingEncoding:NSASCIIStringEncoding];
12.     
13.     CCHmacInit(&context, kCCHmacAlgSHA1, keyCString, strlen(keyCString));
14.     CCHmacUpdate(&context, [data bytes], [data length]);
15.     
16.     unsigned char digestRaw[CC_SHA1_DIGEST_LENGTH];
17.     NSInteger digestLength = CC_SHA1_DIGEST_LENGTH;
18.     
19.     CCHmacFinal(&context, digestRaw);
20.     
21.     return [NSData dataWithBytes:digestRaw length:digestLength];
22. }
24. //FIXME: You Need to CHANGE the DateFormat for ALIYUN OSS
25. static NSString * AFRFC822FormatStringFromDate(NSDate *date) {
26.     NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
27.     [dateFormatter setTimeZone:[NSTimeZone timeZoneWithName:@"GMT"]];
28.     [dateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss z"];
29.     [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
30.     
31.     return [dateFormatter stringFromDate:date];
32. }
34. static NSString * AFBase64EncodedStringFromData(NSData *data) {
35.     NSUInteger length = [data length];
36.     NSMutableData *mutableData = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
37.     
38.     uint8_t *input = (uint8_t *)[data bytes];
39.     uint8_t *output = (uint8_t *)[mutableData mutableBytes];
40.     
41.     for (NSUInteger i = 0; i < length; i += 3) {
42.         NSUInteger value = 0;
43.         for (NSUInteger j = i; j < (i + 3); j++) {
44.             value <<= 8;
45.             if (j < length) {
46.                 value |= (0xFF & input[j]);
47.             }
48.         }
49.         
50.         static uint8_t const kAFBase64EncodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
51.         
52.         NSUInteger idx = (i / 3) * 4;
53.         output[idx + 0] = kAFBase64EncodingTable[(value >> 18) & 0x3F];
54.         output[idx + 1] = kAFBase64EncodingTable[(value >> 12) & 0x3F];
55.         output[idx + 2] = (i + 1) < length ? kAFBase64EncodingTable[(value >> 6)  & 0x3F] : '=';
56.         output[idx + 3] = (i + 2) < length ? kAFBase64EncodingTable[(value >> 0)  & 0x3F] : '=';
57.     }
58.     
59.     return [[NSString alloc] initWithData:mutableData encoding:NSASCIIStringEncoding];
60. }

1. -(void )authorizationHeadersForRequest:(NSMutableURLRequest * __autoreleasing *)request {
2.     // Long header values that are subject to "folding" should split into new lines
3.     // according to Aliyun-OSS's documentation.
4.     NSAssert(_accessId && _accessKey, @"ALIYUN_ACCESS_ID && ALIYUN_ACCESS_KEY must not be nil");
5.     
6.     NSMutableDictionary *headerFields = [NSMutableDictionary dictionary];
7.     [[*request allHTTPHeaderFields] enumerateKeysAndObjectsUsingBlock:^(NSString *key, id value, BOOL *stop) {
8.         key = [key lowercaseString];
9.         if ([key hasPrefix:@"x-oss-"]) {
10.             if ([headerFields objectForKey:key]) {
11.                 value = [[headerFields objectForKey:key] stringByAppendingFormat:@",%@", value];
12.             }
13.             [headerFields setObject:value forKey:key];
14.         }
15.     }];
16.     
17.     NSMutableString *headerString = [NSMutableString string];
18.     for (NSString *key in [[headerFields allKeys] sortedArrayUsingSelector:@selector(compare:)]) {
19.         id value = [headerFields objectForKey:key];
20.         [headerString appendFormat:@"%@:%@\n", key, value];
21.     }
22.     
23.     NSString *canonicalizedResource = [NSString stringWithFormat:@"%@", *request.URL.path];
24.     NSString *method = [*request HTTPMethod];
25.     NSString *contentMD5 = [*request valueForHTTPHeaderField:@"Content-MD5"];
26.     NSString *contentType = [*request valueForHTTPHeaderField:@"Content-Type"];
27.     NSString *date = AFRFC822FormatStringFromDate([NSDate date]);
28.     date = (date) ? date : @"";
29.     [*request setValue:date forHTTPHeaderField:@"Date"];
30.     
31.     NSMutableString *mutableString = [NSMutableString string];
32.     [mutableString appendFormat:@"%@\n", (method) ? method : @""];
33.     [mutableString appendFormat:@"%@\n", (contentMD5) ? contentMD5 : @""];
34.     [mutableString appendFormat:@"%@\n", (contentType) ? contentType : @""];
35.     [mutableString appendFormat:@"%@\n", date];
36.     [mutableString appendFormat:@"%@", headerString];
37.     [mutableString appendFormat:@"%@", canonicalizedResource];
38.     
39.     NSData *hmac = AFHMACSHA1EncodedDataFromStringWithKey(mutableString, ALIYUN_ACCESS_KEY);
40.     NSString *signature = AFBase64EncodedStringFromData(hmac);
41.     NSString *authorization = [NSString stringWithFormat:@"OSS %@:%@", ALIYUN_ACCESS_ID, signature];
42.     
43.     [*request setValue:authorization forHTTPHeaderField:@"Authorization"];
44.     
45. }