GrantRevokeRoleStmt.java

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// Copyright 2014 Cloudera Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.cloudera.impala.analysis;

import com.cloudera.impala.common.AnalysisException;
import com.cloudera.impala.thrift.TGrantRevokeRoleParams;
import com.google.common.base.Preconditions;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;

public class GrantRevokeRoleStmt extends AuthorizationStmt {
  private final String roleName_;
  private final String groupName_;
  private final boolean isGrantStmt_;

  public GrantRevokeRoleStmt(String roleName, String groupName, boolean isGrantStmt) {
    Preconditions.checkNotNull(roleName);
    Preconditions.checkNotNull(groupName);
    roleName_ = roleName;
    groupName_ = groupName;
    isGrantStmt_ = isGrantStmt;
  }

  @Override
  public String toSql() {
    if (isGrantStmt_) {
      return String.format("GRANT ROLE %s TO %s", roleName_, groupName_);
    } else {
      return String.format("REVOKE ROLE %s FROM %s", roleName_, groupName_);
    }
  }

  public TGrantRevokeRoleParams toThrift() {
    TGrantRevokeRoleParams params = new TGrantRevokeRoleParams();
    params.setRole_names(Lists.newArrayList(roleName_));
    params.setGroup_names(Lists.newArrayList(groupName_));
    params.setIs_grant(isGrantStmt_);
    return params;
  }

  @Override
  public void analyze(Analyzer analyzer) throws AnalysisException {
    super.analyze(analyzer);
    if (analyzer.getCatalog().getAuthPolicy().getRole(roleName_) == null) {
      throw new AnalysisException(String.format("Role '%s' does not exist.", roleName_));
    }
    if (Strings.isNullOrEmpty(roleName_)) {
      throw new AnalysisException("Role name in GRANT/REVOKE ROLE cannot be empty.");
    }
    if (Strings.isNullOrEmpty(groupName_)) {
      throw new AnalysisException("Group name in GRANT/REVOKE ROLE cannot be empty.");
    }
  }
}