我正在尝试将文件上传到 S3 容器,在上传之前,我正在设置文件的元数据。上传失败并显示签名不匹配的错误。下面是我正在使用的代码:
public URL send(File f, HashMap<String,String> metadata, String type) throws Exception {
String path = type+"/"+f.getName();
InitiateMultipartUploadRequest req = new InitiateMultipartUploadRequest(container, secretKey).withKey(path);
req.setCannedACL(CannedAccessControlList.AuthenticatedRead);
if (metadata != null) {
ObjectMetadata objectMetadata = new ObjectMetadata();
Set<String> keys = metadata.keySet();
Iterator<String> i = keys.iterator();
while (i.hasNext()) {
String key = i.next();
objectMetadata.addUserMetadata(key, metadata.get(key));
}
req.setObjectMetadata(objectMetadata);
}
InitiateMultipartUploadResult res = s3client.initiateMultipartUpload(req);
String uploadId = res.getUploadId();
long fileSize = f.length();
//check the size doesn't exceed max limit
if (fileSize > MAX_OBJ_SIZE) {
throw new Exception("Object size exceeds repository limit");
}
long chunkSize = 1024 * 1024 * 16;
int chunks = (int) (fileSize/chunkSize + 2);
List<PartETag> chunkList = new ArrayList<PartETag>();
long pos = 0;
try {
for (int i = 1; i < chunks; i++) {
if ((chunks -i) < 2) {
chunkSize = fileSize - pos;
}
UploadPartRequest upReq = new UploadPartRequest()
.withBucketName(container).withKey(path)
.withUploadId(uploadId).withPartNumber(i)
.withFileOffset(pos).withFile(f)
.withPartSize(chunkSize);
PartETag pTag = null;
// repeat the upload until it succeeds.
boolean repeat;
do {
repeat = false; // reset switch
try {
// Upload part and add response to our list.
pTag = s3client.uploadPart(upReq).getPartETag();
}
catch (Exception ex) {
repeat = true; // repeat
}
} while (repeat);
chunkList.add(pTag);
pos = pos + chunkSize;
}
CompleteMultipartUploadRequest compl = new CompleteMultipartUploadRequest(
container, secretKey, uploadId, chunkList).withKey(path);
CompleteMultipartUploadResult complRes = s3client.completeMultipartUpload(compl);
return new URL(URLDecoder.decode(complRes.getLocation(), "UTF-8"));
}
catch (Exception ex) {
s3client.abortMultipartUpload(new AbortMultipartUploadRequest(container,
secretKey, uploadId));
throw new Exception("File upload error: "+ex.toString());
}
}
下面是我得到的错误:
com.amazonaws.services.s3.model.AmazonS3Exception: Status Code: 403, AWS Service: Amazon S3, AWS Request ID: 0805716BBD0662AB, AWS Error Code: SignatureDoesNotMatch, AWS Error Message: The request signature we calculated does not match the signature you provided. Check your key and signing method., S3 Extended Request ID: wNAzUyrLZgWCazZFe3KpMHO0uh0FM5FF7fiwBzN1A2YDEYS5hKZBYh5nWSjIhnhG
at com.amazonaws.http.AmazonHttpClient.handleErrorResponse(AmazonHttpClient.java:767)
at com.amazonaws.http.AmazonHttpClient.executeHelper(AmazonHttpClient.java:414)
at com.amazonaws.http.AmazonHttpClient.execute(AmazonHttpClient.java:228)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3316)
at com.amazonaws.services.s3.AmazonS3Client.initiateMultipartUpload(AmazonS3Client.java:2401)
at net.timbusproject.storage.awss3.S3Client.send(S3Client.java:134)
发生错误的 S3Client.java 中的第 134 行是:
InitiateMultipartUploadResult res = s3client.initiateMultipartUpload(req);
如果我没有附加任何元数据,上传工作正常。即,如果我评论以下行,则上传有效:
req.setObjectMetadata(objectMetadata);
我无法弄清楚设置元数据后请求失败的原因。我是否遗漏了上传过程中的任何步骤?
最佳答案
我能够通过对元数据键和值进行 URL 编码来解决这个问题。
objectMetadata.addUserMetadata(URLEncoder.encode(key, "UTF-8"), URLEncoder.encode(metadata.get(key),"UTF-8"));
显然,元数据似乎有一些令人反感的字符,这些字符会干扰 AWS 调用。此解决方法将使上传无误地完成并更新元数据,但字符串仍保持 url 编码,这可能会在以后出现问题。
关于java - AWS Java SDK 上传元数据时出错,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23239304/