如何使用亚马逊预签名网址

Question

我正尝试使用预先签名的网址从亚马逊下载图片。这里是代码，但是必须丢失一些东西，图片没有显示。提前致谢！

//Set up the request 
S3GetPreSignedURLRequest * request = [[S3GetPreSignedURLRequest alloc] init]; 
request.bucket = @"a"; 
request.key = @"b"; 
request.contentType = @"image/jpeg"; 
request.httpVerb = @"GET"; 

//set credential 
AmazonCredentials * credentials = [[AmazonCredentials alloc] initWithAccessKey:ACCESS_KEY withSecretKey:SECRET_KEY]; 
request.credentials = credentials; 

//set expire 
NSDateComponents *components = [[[NSDateComponents alloc] init] autorelease]; 
[components setHour:1]; 
NSDate * oneHourFromNow = [[NSCalendar currentCalendar] dateByAddingComponents:components toDate:[NSDate date] options:0]; 

request.expires = oneHourFromNow; 

//get the presigned URL 
NSURL * url = [[Constants s3] getPreSignedURL: request]; 

Answer 1

expire需要UTC时间，而不是当地时间。

Answer 2

如果有人正在寻找使用Amazon CloudFront的预签名URL，您可能会找到following link very useful。