Put files into Google Cloud Storage (GCS) via signed URL

kctang：

I'm trying to use a "signed URL" to access/upload files to Google Cloud Storage (GCS).

Follow the instructions at https://developers.google.com/storage/docs/accesscontrol#Signing-Strings

what did I do:

  • "Web Application" is registered in Google Cloud Console.
  • Generate a new private key using "Generate New Key" in the "Certificates" section of the registered web application screen.
  • Created the string to be signed and signed it using the sample code provided in the "How to Sign" section of that page (with some minor tweaks to the hardcoded values ​​of the Java main program). Update: Created gist for GcsSigner.java .
  • Make sure the signed string is URL encoded.
  • Specified HTTP headers: x-goog-api-version, x-goog-project-id, Content-Type.
  • Specified URL parameters: GoogleAccessId, Signature, Expiration.
  • Emulate PUT requests using Postman (a Chrome extension).

However, I still get this (status: 403 Forbidden):

<?xml version='1.0' encoding='UTF-8'?>
<Error>
    <Code>SignatureDoesNotMatch</Code>
    <Message>The request signature we calculated does not match the signature you provided. Check your Google secret key and signing method.</Message>
    <StringToSign>PUT

text/plain
1384084959392
x-goog-api-version:2
x-goog-project-id:99999
/mybucket/myfile.txt</StringToSign>
</Error>

Even if I retry signing the string based on the value in "StringToSign", I still get the same error.

Read various related posts here, but couldn't find any solution, most of which I referenced x-goog-api-version:1when using version 2 .

What am I missing? Any help would be greatly appreciated.

kctang：

Finally managed to get the file into Google Cloud Storage using the signed URL. This is simulated by creating a simple Java program:

  • ServerSign and encode the string into the signature.
  • UploaderAs an unauthenticated user, submit PUT requests using only the provided signature Server. The browser is emulated using Apache's HTTP client library.

You can view the demo application here .

I really don't understand why it doesn't work when I submit via Chrome's Postman extension.

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