Admin Client

/**
 * Interface for communicating with Ranger Admin server
 */
public interface RangerAdminClient {
    /**
     * Initialize the admin client
     * @param serviceName - Name of the service
     * @param appId - Application identifier
     * @param configPropertyPrefix - Configuration property prefix
     * @param config - Hadoop configuration
     */
    void init(String serviceName, String appId, String configPropertyPrefix, Configuration config);
    
    /**
     * Get service policies if updated since last known version
     * @param lastKnownVersion - Last known policy version
     * @param lastActivationTimeInMillis - Last activation time
     * @return Service policies if updated, null otherwise
     * @throws Exception if communication fails
     */
    ServicePolicies getServicePoliciesIfUpdated(long lastKnownVersion, long lastActivationTimeInMillis) throws Exception;
    
    /**
     * Get roles if updated since last known version
     * @param lastKnownRoleVersion - Last known role version
     * @param lastActivationTimeInMillis - Last activation time
     * @return Ranger roles if updated, null otherwise
     * @throws Exception if communication fails
     */
    RangerRoles getRolesIfUpdated(long lastKnownRoleVersion, long lastActivationTimeInMillis) throws Exception;
    
    /**
     * Create a new role
     * @param request - Role creation request
     * @return Created role
     * @throws Exception if creation fails
     */
    RangerRole createRole(RangerRole request) throws Exception;
    
    /**
     * Drop an existing role
     * @param execUser - Executing user
     * @param roleName - Name of role to drop
     * @throws Exception if drop fails
     */
    void dropRole(String execUser, String roleName) throws Exception;
    
    /**
     * Get all roles
     * @param execUser - Executing user
     * @return List of all role names
     * @throws Exception if retrieval fails
     */
    List<String> getAllRoles(String execUser) throws Exception;
    
    /**
     * Get roles for a specific user
     * @param execUser - User to get roles for
     * @return List of role names for the user
     * @throws Exception if retrieval fails
     */
    List<String> getUserRoles(String execUser) throws Exception;
    
    /**
     * Get a specific role
     * @param execUser - Executing user
     * @param roleName - Name of role to retrieve
     * @return Role information
     * @throws Exception if retrieval fails
     */
    RangerRole getRole(String execUser, String roleName) throws Exception;
    
    /**
     * Grant a role to users/groups
     * @param request - Role grant request
     * @throws Exception if grant fails
     */
    void grantRole(GrantRevokeRoleRequest request) throws Exception;
    
    /**
     * Revoke a role from users/groups
     * @param request - Role revoke request
     * @throws Exception if revoke fails
     */
    void revokeRole(GrantRevokeRoleRequest request) throws Exception;
    
    /**
     * Grant access permissions
     * @param request - Access grant request
     * @throws Exception if grant fails
     */
    void grantAccess(GrantRevokeRequest request) throws Exception;
    
    /**
     * Revoke access permissions
     * @param request - Access revoke request
     * @throws Exception if revoke fails
     */
    void revokeAccess(GrantRevokeRequest request) throws Exception;
    
    /**
     * Get service tags if updated since last known version
     * @param lastKnownVersion - Last known tag version
     * @param lastActivationTimeInMillis - Last activation time
     * @return Service tags if updated, null otherwise
     * @throws Exception if retrieval fails
     */
    ServiceTags getServiceTagsIfUpdated(long lastKnownVersion, long lastActivationTimeInMillis) throws Exception;
    
    /**
     * Get tag types matching a pattern
     * @param tagTypePattern - Pattern to match tag types
     * @return List of matching tag type names
     * @throws Exception if retrieval fails
     */
    List<String> getTagTypes(String tagTypePattern) throws Exception;
    
    /**
     * Get user store if updated since last known version
     * @param lastKnownUserStoreVersion - Last known user store version
     * @param lastActivationTimeInMillis - Last activation time
     * @return User store if updated, null otherwise
     * @throws Exception if retrieval fails
     */
    RangerUserStore getUserStoreIfUpdated(long lastKnownUserStoreVersion, long lastActivationTimeInMillis) throws Exception;
}

/**
 * Abstract base implementation of RangerAdminClient
 */
public abstract class AbstractRangerAdminClient implements RangerAdminClient {
    /**
     * Gson instance for JSON processing
     */
    protected Gson gson;
    
    /**
     * Initialize the admin client
     */
    public void init(String serviceName, String appId, String configPropertyPrefix, Configuration config);
    
    /**
     * Check if Kerberos is enabled for the user
     * @param user - User group information
     * @return True if Kerberos is enabled
     */
    public boolean isKerberosEnabled(UserGroupInformation user);
    
    // All interface methods with default implementations
    public ServicePolicies getServicePoliciesIfUpdated(long lastKnownVersion, long lastActivationTimeInMillis) throws Exception;
    public RangerRoles getRolesIfUpdated(long lastKnownRoleVersion, long lastActivationTimeInMillis) throws Exception;
    public RangerRole createRole(RangerRole request) throws Exception;
    public void dropRole(String execUser, String roleName) throws Exception;
    public List<String> getAllRoles(String execUser) throws Exception;
    public List<String> getUserRoles(String execUser) throws Exception;
    public RangerRole getRole(String execUser, String roleName) throws Exception;
    public void grantRole(GrantRevokeRoleRequest request) throws Exception;
    public void revokeRole(GrantRevokeRoleRequest request) throws Exception;
    public void grantAccess(GrantRevokeRequest request) throws Exception;
    public void revokeAccess(GrantRevokeRequest request) throws Exception;
    public ServiceTags getServiceTagsIfUpdated(long lastKnownVersion, long lastActivationTimeInMillis) throws Exception;
    public List<String> getTagTypes(String tagTypePattern) throws Exception;
    public RangerUserStore getUserStoreIfUpdated(long lastKnownUserStoreVersion, long lastActivationTimeInMillis) throws Exception;
}

/**
 * REST client implementation for Ranger Admin communication
 */
public class RangerAdminRESTClient extends AbstractRangerAdminClient {
    /**
     * Initialize the REST client with configuration
     * @param serviceName - Name of the service
     * @param appId - Application identifier
     * @param propertyPrefix - Configuration property prefix
     * @param config - Hadoop configuration
     */
    public void init(String serviceName, String appId, String propertyPrefix, Configuration config);
}

/**
 * Data for grant/revoke operations
 */
public class GrantRevokeData implements java.io.Serializable {
    /**
     * Default constructor
     */
    public GrantRevokeData();
    
    /**
     * Get the grantor user
     * @return Grantor username
     */
    public String getGrantor();
    
    /**
     * Set the grantor user
     * @param grantor - Grantor username
     */
    public void setGrantor(String grantor);
    
    /**
     * Get repository name
     * @return Repository name
     */
    public String getRepositoryName();
    
    /**
     * Set repository name
     * @param repositoryName - Repository name
     */
    public void setRepositoryName(String repositoryName);
    
    /**
     * Get repository type
     * @return Repository type
     */
    public String getRepositoryType();
    
    /**
     * Set repository type
     * @param repositoryType - Repository type
     */
    public void setRepositoryType(String repositoryType);
    
    /**
     * Get databases
     * @return Databases string
     */
    public String getDatabases();
    
    /**
     * Set databases
     * @param databases - Databases string
     */
    public void setDatabases(String databases);
    
    /**
     * Get tables
     * @return Tables string
     */
    public String getTables();
    
    /**
     * Set tables
     * @param tables - Tables string
     */
    public void setTables(String tables);
    
    /**
     * Get columns
     * @return Columns string
     */
    public String getColumns();
    
    /**
     * Set columns
     * @param columns - Columns string
     */
    public void setColumns(String columns);
    
    /**
     * Get column families
     * @return Column families string
     */
    public String getColumnFamilies();
    
    /**
     * Set column families
     * @param columnFamilies - Column families string
     */
    public void setColumnFamilies(String columnFamilies);
    
    /**
     * Get permission mappings
     * @return List of permission mappings
     */
    public List<PermMap> getPermMapList();
    
    /**
     * Set permission mappings
     * @param permMapList - List of permission mappings
     */
    public void setPermMapList(List<PermMap> permMapList);
    
    /**
     * Set Hive-specific data
     * @param grantor - Grantor user
     * @param repositoryName - Repository name
     * @param databases - Database names
     * @param tables - Table names
     * @param columns - Column names
     * @param permMap - Permission mapping
     */
    public void setHiveData(String grantor, String repositoryName, String databases, String tables, String columns, PermMap permMap);
    
    /**
     * Set HBase-specific data
     * @param grantor - Grantor user
     * @param repositoryName - Repository name
     * @param tables - Table names
     * @param columns - Column names
     * @param columnFamilies - Column family names
     * @param permMap - Permission mapping
     */
    public void setHBaseData(String grantor, String repositoryName, String tables, String columns, String columnFamilies, PermMap permMap);
    
    /**
     * Convert to JSON
     * @return JSON string representation
     */
    public String toJson();
    
    /**
     * Permission mapping class
     */
    public static class PermMap implements java.io.Serializable {
        /**
         * Default constructor
         */
        public PermMap();
        
        /**
         * Constructor with single user, group, and permission
         * @param user - Username
         * @param group - Group name
         * @param perm - Permission
         */
        public PermMap(String user, String group, String perm);
        
        /**
         * Constructor with lists of users, groups, and permissions
         * @param userList - List of users
         * @param groupList - List of groups
         * @param permList - List of permissions
         */
        public PermMap(List<String> userList, List<String> groupList, List<String> permList);
        
        /**
         * Get user list
         * @return List of users
         */
        public List<String> getUserList();
        
        /**
         * Get group list
         * @return List of groups
         */
        public List<String> getGroupList();
        
        /**
         * Get permission list
         * @return List of permissions
         */
        public List<String> getPermList();
        
        /**
         * Add a user
         * @param user - Username to add
         */
        public void addUser(String user);
        
        /**
         * Add a group
         * @param group - Group name to add
         */
        public void addGroup(String group);
        
        /**
         * Add a permission
         * @param perm - Permission to add
         */
        public void addPerm(String perm);
        
        /**
         * Convert to JSON
         * @return JSON string representation
         */
        public String toJson();
    }
}

/**
 * REST response object
 */
public class RESTResponse implements java.io.Serializable {
    /**
     * Success status code
     */
    public static final int STATUS_SUCCESS = 0;
    
    /**
     * Error status code
     */
    public static final int STATUS_ERROR = 1;
    
    /**
     * Validation error status code
     */
    public static final int STATUS_VALIDATION = 2;
    
    /**
     * Warning status code
     */
    public static final int STATUS_WARN = 3;
    
    /**
     * Info status code
     */
    public static final int STATUS_INFO = 4;
    
    /**
     * Partial success status code
     */
    public static final int STATUS_PARTIAL_SUCCESS = 5;
    
    /**
     * Maximum response status value
     */
    public static final int ResponseStatus_MAX = 5;
    
    /**
     * Get HTTP status code
     * @return HTTP status code
     */
    public int getHttpStatusCode();
    
    /**
     * Set HTTP status code
     * @param httpStatusCode - HTTP status code
     */
    public void setHttpStatusCode(int httpStatusCode);
    
    /**
     * Get status code
     * @return Status code
     */
    public int getStatusCode();
    
    /**
     * Set status code
     * @param statusCode - Status code
     */
    public void setStatusCode(int statusCode);
    
    /**
     * Get message description
     * @return Message description
     */
    public String getMsgDesc();
    
    /**
     * Set message description
     * @param msgDesc - Message description
     */
    public void setMsgDesc(String msgDesc);
    
    /**
     * Get message list
     * @return List of messages
     */
    public List<Message> getMessageList();
    
    /**
     * Set message list
     * @param messageList - List of messages
     */
    public void setMessageList(List<Message> messageList);
    
    /**
     * Get combined message
     * @return Combined message string
     */
    public String getMessage();
    
    /**
     * Create REST response from client response
     * @param response - Client response
     * @return REST response
     */
    public static RESTResponse fromClientResponse(ClientResponse response);
    
    /**
     * Convert to JSON
     * @return JSON string representation
     */
    public String toJson();
    
    /**
     * Create from JSON
     * @param jsonString - JSON string
     * @return REST response
     */
    public static RESTResponse fromJson(String jsonString);
    
    /**
     * Message class for REST responses
     */
    public static class Message implements java.io.Serializable {
        /**
         * Get message name
         * @return Message name
         */
        public String getName();
        
        /**
         * Set message name
         * @param name - Message name
         */
        public void setName(String name);
        
        /**
         * Get resource bundle key
         * @return Resource bundle key
         */
        public String getRbKey();
        
        /**
         * Set resource bundle key
         * @param rbKey - Resource bundle key
         */
        public void setRbKey(String rbKey);
        
        /**
         * Get message text
         * @return Message text
         */
        public String getMessage();
        
        /**
         * Set message text
         * @param message - Message text
         */
        public void setMessage(String message);
        
        /**
         * Get object ID
         * @return Object ID
         */
        public Long getObjectId();
        
        /**
         * Set object ID
         * @param objectId - Object ID
         */
        public void setObjectId(Long objectId);
        
        /**
         * Get field name
         * @return Field name
         */
        public String getFieldName();
        
        /**
         * Set field name
         * @param fieldName - Field name
         */
        public void setFieldName(String fieldName);
        
        /**
         * Convert to JSON
         * @return JSON string representation
         */
        public String toJson();
    }
}

import org.apache.ranger.admin.client.RangerAdminRESTClient;
import org.apache.ranger.plugin.util.GrantRevokeRequest;
import org.apache.ranger.plugin.util.ServicePolicies;
import org.apache.hadoop.conf.Configuration;

// Initialize admin client
RangerAdminRESTClient adminClient = new RangerAdminRESTClient();
Configuration config = new Configuration();
config.set("ranger.plugin.hdfs.service.name", "hdfs-service");
config.set("ranger.plugin.hdfs.policy.rest.url", "http://ranger-admin:6080");

adminClient.init("hdfs-service", "HDFSPlugin", "ranger.plugin.hdfs", config);

// Get policies
long lastKnownVersion = 0;
ServicePolicies policies = adminClient.getServicePoliciesIfUpdated(lastKnownVersion, System.currentTimeMillis());
if (policies != null) {
    System.out.println("Retrieved " + policies.getPolicies().size() + " policies");
    System.out.println("Policy version: " + policies.getPolicyVersion());
}

// Grant access
GrantRevokeRequest grantRequest = new GrantRevokeRequest();
grantRequest.setGrantor("admin");
grantRequest.setUsers(Set.of("alice", "bob"));
grantRequest.setGroups(Set.of("analysts"));
grantRequest.setAccessTypes(Set.of("read", "write"));

Map<String, String> resource = new HashMap<>();
resource.put("path", "/data/analytics/*");
grantRequest.setResource(resource);
grantRequest.setIsRecursive(true);

try {
    adminClient.grantAccess(grantRequest);
    System.out.println("Access granted successfully");
} catch (Exception e) {
    System.err.println("Failed to grant access: " + e.getMessage());
}

// Revoke access
GrantRevokeRequest revokeRequest = new GrantRevokeRequest();
revokeRequest.setGrantor("admin");
revokeRequest.setUsers(Set.of("alice"));
revokeRequest.setAccessTypes(Set.of("write"));
revokeRequest.setResource(resource);

try {
    adminClient.revokeAccess(revokeRequest);
    System.out.println("Access revoked successfully");
} catch (Exception e) {
    System.err.println("Failed to revoke access: " + e.getMessage());
}

// Get roles
try {
    List<String> allRoles = adminClient.getAllRoles("admin");
    System.out.println("Available roles: " + allRoles);
    
    List<String> userRoles = adminClient.getUserRoles("alice");
    System.out.println("Alice's roles: " + userRoles);
} catch (Exception e) {
    System.err.println("Failed to retrieve roles: " + e.getMessage());
}