从 Appengine (JAVA) 更改 Google Cloud Storage 的 ACL [英] Changing ACL for Google Cloud Storage from Appengine (JAVA)
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问题描述
Is it possible to change the ACLs of Google Cloud Storage objects(or buckets) using the appengine Api? I understand that this can be done using the REST API, but is there support for this in the Files Api in appengine? They can be set when creating a new object using GSFileObject, however can you change on existing objects??
解决方案
You can use urlfetch.fetch and app_identity.get_access_token to easily send an authenticated request to the REST api.
Python:
from google.appengine.api import app_identity
from google.appengine.api import urlfetch
acl_xml = """
<AccessControlList><Entries>
<Entry>
<Scope type="UserByEmail">foo@example.com</Scope>
<Permission>READ</Permission>
</Entry>
</Entries></AccessControlList>
"""
scope = 'https://www.googleapis.com/auth/devstorage.full_control'
token = app_identity.get_access_token(scope)
response = urlfetch.fetch(
'http://storage.googleapis.com/bucket/obj?acl',
method=urlfetch.PUT,
payload=acl_xml,
headers={'Authorization': 'OAuth %s' % token})
Java:
import com.google.appengine.api.appidentity.AppIdentityService;
import com.google.appengine.api.appidentity.AppIdentityServiceFactory;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
public String setAcl() throws Exception {
// Change foo@example.com to a valid email.
// Repeat <Entry/> as many times as necessary.
String xmlString = "";
xmlString += "<AccessControlList><Entries>";
xmlString += " <Entry>";
xmlString += " <Scope type="UserByEmail">foo@example.com</Scope>";
xmlString += " <Permission>READ</Permission>";
xmlString += " </Entry>";
xmlString += "</Entries></AccessControlList>";
ArrayList scopes = new ArrayList();
scopes.add("https://www.googleapis.com/auth/devstorage.full_control");
AppIdentityService.GetAccessTokenResult accessToken =
AppIdentityServiceFactory.getAppIdentityService().getAccessToken(scopes);
// Change bucket and obj to the bucket and object of interest.
URL url = new URL("https://storage.googleapis.com/bucket/obj?acl");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("PUT");
connection.addRequestProperty(
"Authorization", "OAuth " + accessToken.getAccessToken());
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(xmlString);
writer.close();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
throw new Exception();
}
}
More info:
- Python: https://developers.google.com/appengine/docs/python/appidentity/overview
- Java: https://developers.google.com/appengine/docs/java/appidentity/overview
- Relevant oauth scopes: https://developers.google.com/storage/docs/authentication#oauth
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