Ecco un esempio di base utilizzando PUT. Ovviamente si deve usare una coda piuttosto che una richiesta sincrona nel reale mondo.
Se si modificano le intestazioni AMZ, non dimenticate di aggiornare 'canonicalizedAmzHeaders' secondo le istruzioni di Amazon.
#import "ASIHTTPRequest.h"
#import <CommonCrypto/CommonHMAC.h>
...
- (void)testS3
{
NSString *filePath = @"/path/to/file";
NSString *contentType = @"text/plain";
NSString *bucket = @"mybucket";
NSString *path = @"test";
NSString *secretAccessKey = @"my-secret-access-key";
NSString *accessKey = @"my-access-key";
NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"EEE, d MMM yyyy HH:mm:ss zzzz"];
NSString *date = [dateFormatter stringFromDate:[NSDate date]];
ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://%@.s3.amazonaws.com/%@",bucket,path]]] autorelease];
[request setPostBodyFilePath:filePath];
[request setShouldStreamPostDataFromDisk:YES];
[request setRequestMethod:@"PUT"];
[request addRequestHeader:@"x-amz-acl" value:@"private"];
[request addRequestHeader:@"Content-Type" value:contentType];
[request addRequestHeader:@"Date" value:date];
NSString *canonicalizedAmzHeaders = @"x-amz-acl:private";
NSString *canonicalizedResource = [NSString stringWithFormat:@"/%@/%@",bucket,path];
NSString *stringToSign = [NSString stringWithFormat:@"PUT\n\n%@\n%@\n%@\n%@",contentType,date,canonicalizedAmzHeaders,canonicalizedResource];
NSString *signature = [self base64forData:[self HMACSHA1withKey:secretAccessKey forString:stringToSign]];
NSString *auth = [NSString stringWithFormat:@"AWS %@:%@",accessKey,signature];
[request addRequestHeader:@"Authorization" value:auth];
[request start];
NSLog(@"%@",[request responseString]);
}
// Source: http://stackoverflow.com/questions/476455/is-there-a-library-for-iphone-to-work-with-hmac-sha-1-encoding
- (NSData *)HMACSHA1withKey:(NSString *)key forString:(NSString *)string
{
NSData *clearTextData = [string dataUsingEncoding:NSUTF8StringEncoding];
NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};
CCHmacContext hmacContext;
CCHmacInit(&hmacContext, kCCHmacAlgSHA1, keyData.bytes, keyData.length);
CCHmacUpdate(&hmacContext, clearTextData.bytes, clearTextData.length);
CCHmacFinal(&hmacContext, digest);
return [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
}
//Source http://www.cocoadev.com/index.pl?BaseSixtyFour
- (NSString *)base64forData:(NSData *)data
{
static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/";
if ([data length] == 0)
return @"";
char *characters = malloc((([data length] + 2)/3) * 4);
if (characters == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (i < [data length])
{
char buffer[3] = {0,0,0};
short bufferLength = 0;
while (bufferLength < 3 && i < [data length])
buffer[bufferLength++] = ((char *)[data bytes])[i++];
// Encode the bytes in the buffer to four characters, including padding "=" characters if necessary.
characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
characters[length++] = encodingTable[((buffer[0] & 0x03) << 4) | ((buffer[1] & 0xF0) >> 4)];
if (bufferLength > 1)
characters[length++] = encodingTable[((buffer[1] & 0x0F) << 2) | ((buffer[2] & 0xC0) >> 6)];
else characters[length++] = '=';
if (bufferLength > 2)
characters[length++] = encodingTable[buffer[2] & 0x3F];
else characters[length++] = '=';
}
return [[[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES] autorelease];
}
Hmmmm: difficile da aiutare senza dettagli oltre "non funziona". Cosa specificamente? Non funziona in che modo? Codice? Che cosa hai provato? – Hunter