storage: content-type condition does not appear in generated V4 post policy #2767
Description
Client
Storage
Code
e.g.
opts := &storage.PostPolicyV4Options{
GoogleAccessID: email,
PrivateKey: privateKey,
Expires: time.Now().Add(10*time.Minute),
Fields: &storage.PolicyV4Fields{
ContentType: "text/plain",
},
}
googlePolicy, err := storage.GenerateSignedPostPolicyV4(c.config.GoogleUploadBucket, objectKey, opts)Expected behavior
The provided Content-Type should be included as a condition in the signed policy, per https://cloud.google.com/storage/docs/xml-api/post-object.
Actual behavior
The provided Content-Type is not included in the signed policy. Example resulting policy:
{
"URL": "https://storage.googleapis.com/mybucket/",
"Fields": {
"key": "myobject",
"policy": "eyJjb25kaXRpb25zIjpbeyJidWNrZXQiOiJteWJ1Y2tldCJ9LHsia2V5IjoibXlvYmplY3QifSx7IngtZ29vZy1kYXRlIjoiMjAyMDA4MjRUMTAyMjIwWiJ9LHsieC1nb29nLWNyZWRlbnRpYWwiOiJ0ZXN0QGR1bW15LmlhbS5nc2VydmljZWFjY291bnQuY29tLzIwMjAwODI0L2F1dG8vc3RvcmFnZS9nb29nNF9yZXF1ZXN0In0seyJ4LWdvb2ctYWxnb3JpdGhtIjoiR09PRzQtUlNBLVNIQTI1NiJ9XSwiZXhwaXJhdGlvbiI6IjIwMjAtMDgtMjRUMTA6MzI6MjBaIn0=",
"x-goog-algorithm": "GOOG4-RSA-SHA256",
"x-goog-credential": "test@dummy.iam.gserviceaccount.com/20200824/auto/storage/goog4_request",
"x-goog-date": "20200824T102220Z",
"x-goog-signature": "[redacted]"
}
}