/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in compliance with the License, which is
* available at www.apache.org/licenses/LICENSE-2.0
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied, as more fully set forth in the License.
*
* See the NOTICE file distributed with this work for information regarding copyright ownership.
*/
package alluxio.underfs.s3;
import org.jets3t.service.acl.AccessControlList;
import org.jets3t.service.acl.GrantAndPermission;
import org.jets3t.service.acl.GranteeInterface;
import org.jets3t.service.acl.GroupGrantee;
import org.jets3t.service.acl.Permission;
/**
* Util functions for S3N under file system.
*/
public final class S3Utils {
/**
* Translates S3 bucket ACL to Alluxio owner mode.
*
* @param acl the acl of S3 bucket
* @param userId the S3 user id of the Alluxio owner
* @return the translated posix mode in short format
*/
public static short translateBucketAcl(AccessControlList acl, String userId) {
short mode = (short) 0;
for (GrantAndPermission gp : acl.getGrantAndPermissions()) {
Permission perm = gp.getPermission();
GranteeInterface grantee = gp.getGrantee();
if (perm.equals(Permission.PERMISSION_READ)) {
if (isUserIdInGrantee(grantee, userId)) {
// If the bucket is readable by the user, add r and x to the owner mode.
mode |= (short) 0500;
}
} else if (perm.equals(Permission.PERMISSION_WRITE)) {
if (isUserIdInGrantee(grantee, userId)) {
// If the bucket is writable by the user, +w to the owner mode.
mode |= (short) 0200;
}
} else if (perm.equals(Permission.PERMISSION_FULL_CONTROL)) {
if (isUserIdInGrantee(grantee, userId)) {
// If the user has full control to the bucket, +rwx to the owner mode.
mode |= (short) 0700;
}
}
}
return mode;
}
private static boolean isUserIdInGrantee(GranteeInterface grantee, String userId) {
return grantee.getIdentifier().equals(userId)
|| grantee.equals(GroupGrantee.ALL_USERS)
|| grantee.equals(GroupGrantee.AUTHENTICATED_USERS);
}
private S3Utils() {} // prevent instantiation
}