angular - 发布到AWS S3预签名URL时的SignatureDoesNotMatch错误

Question

真的很难与这个，所以任何帮助将是巨大的!

因此，我尝试使用预签名的URL直接从浏览器将pdf文件上传到Amazon S3。

我使用AWS Java SDK(用Kotlin编写的代码)在服务器上生成url，如下所示:

    val objectKey = StringBuilder().append("xxx").append("/").append("file1.pdf").toString()

    val expiration = java.util.Date()
    var msec = expiration.time
    msec += (1000 * 60).toLong() // Add 1 minute. This means that the url expires in 1 minute.
    expiration.time = msec

    String bucketName = "test"

    val responseHeaders = ResponseHeaderOverrides().withContentType("multipart/form-data")

    val generatePresignedUrlRequest = GeneratePresignedUrlRequest(bucketName, objectKey)
    generatePresignedUrlRequest.method = HttpMethod.POST
    generatePresignedUrlRequest.responseHeaders = responseHeaders
    generatePresignedUrlRequest.expiration = expiration

    return s3Client.generatePresignedUrl(generatePresignedUrlRequest)

然后将该URL返回到使用Angular的浏览器代码。
然后，我使用以下 typescript 代码直接上传文件:

returnPresignUrl() {
   return this.http.get(this.attachmentUploadUrl, this.httpOptions);

}

   uploadFiletoS3(file, filetype) {
       let presignURL;
       const data = file;
       const fileHeaders = {
           headers: new HttpHeaders({
               'Content-Type': 'multipart/form-data',
           })
       };
       this.returnPresignUrl().subscribe(url => {
           presignURL = url;
           this.http.post(presignURL, data, 
fileHeaders).subscribe((res) => {
               console.log('File uploaded', res);
           }, (error) => { console.log('Error uploading File', error); 
});
       }, (error) => { console.log('Error getting a preasign URL: ', 
error); });
   }

但是我得到以下错误响应:

<Code>SignatureDoesNotMatch</Code>
<Message>
    The request signature we calculated does not match the signature you 
provided. Check your key and signing method.
</Message>

有任何想法吗？

我在presign url中指定了内容类型 header ，然后在对URL的post请求中也将其设置，所以我看不到 header 不匹配(该错误似乎导致了我所看到的问题)。

邮寄要求有什么特别之处吗？
内容类型是否正确，可以将pdf文件上传到S3？

任何见解都会很棒，谢谢!

Answer 1

使用:generatePresignedUrlRequest.setContentType("application/octet-stream");
代替:
multipart/form-data。

这是我生成预签名URL的方法:

public GeneratePresignedUrlRequest getGeneratePresignedUrlRequest(String tempBucketName,String objectKey){
    Date expirationTime = getExpirationTime();
    GeneratePresignedUrlRequest generatePresignedUrlRequest = new GeneratePresignedUrlRequest(tempBucketName, objectKey);
    generatePresignedUrlRequest.setMethod(HttpMethod.PUT);
    generatePresignedUrlRequest.setExpiration(expirationTime);
    generatePresignedUrlRequest.setContentType("application/octet-stream");
    return generatePresignedUrlRequest;
}

进行 call 放置调用以上传文件时，应使用相同的Content-Type。