bucket.Put with object keys with spaces fails (fix included)

The s3 request signing process signs a payload with an unescaped path. When amazon checks the signature, it does so on an escaped version of the path (containing the object key/name). All put requests with spaces in object keys fail with "The request signature we calculated does not match the signature you provided. Check your key and signing method.".

The fix I am using now is to escape "canonicalPath" var before passing it to the sign function. A diff of the fix below:

=== modified file 's3/s3.go'
--- s3/s3.go 2012-07-19 13:51:13 +0000
+++ s3/s3.go 2012-12-06 16:49:38 +0000
@@ -396,6 +396,7 @@
        if err != nil {
                return fmt.Errorf("bad S3 endpoint URL %q: %v", req.baseurl, err)
        }
+ canonicalPath = (&url.URL{Path: canonicalPath}).String()
        req.headers["Host"] = []string{u.Host}
        req.headers["Date"] = []string{time.Now().In(time.UTC).Format(time.RFC1123)}
        sign(s3.Auth, req.method, canonicalPath, req.params, req.headers)