Core Audit Framework

/**
 * Primary factory for creating and managing audit providers
 */
public class AuditProviderFactory {
    /**
     * Get singleton instance of the audit provider factory
     * @return AuditProviderFactory instance
     */
    public static AuditProviderFactory getInstance();
    
    /**
     * Initialize the audit provider factory with configuration
     * @param props Properties containing audit configuration
     * @param appType Application type identifier
     */
    public void init(Properties props, String appType);
    
    /**
     * Get the configured audit provider
     * @return AuditHandler configured audit provider
     */
    public AuditHandler getAuditProvider();
    
    /**
     * Shutdown the audit provider factory and all providers
     */
    public void shutdown();
}

/**
 * Factory for creating audit file writers
 */
public class AuditWriterFactory {
    /**
     * Get singleton instance of the audit writer factory
     * @return AuditWriterFactory instance
     */
    public static AuditWriterFactory getInstance();
    
    /**
     * Create audit writer for specified format
     * @param writerType Type of writer to create ("json", "orc")
     * @return RangerAuditWriter writer instance
     */
    public RangerAuditWriter createWriter(String writerType);
    
    /**
     * Get configured audit writer
     * @return RangerAuditWriter configured writer
     */
    public RangerAuditWriter getAuditWriter();
}

/**
 * Primary interface for all audit handlers
 */
public interface AuditHandler {
    /**
     * Log a single audit event
     * @param event AuditEventBase event to log
     * @return boolean true if successful, false otherwise
     */
    public boolean log(AuditEventBase event);
    
    /**
     * Log a collection of audit events
     * @param events Collection<AuditEventBase> events to log
     * @return boolean true if successful, false otherwise
     */
    public boolean log(Collection<AuditEventBase> events);
    
    /**
     * Log a JSON string audit event
     * @param event String JSON-formatted audit event
     * @return boolean true if successful, false otherwise
     */
    public boolean logJSON(String event);
    
    /**
     * Log a collection of JSON string audit events
     * @param events Collection<String> JSON-formatted events
     * @return boolean true if successful, false otherwise
     */
    public boolean logJSON(Collection<String> events);
    
    /**
     * Log audit events from a file
     * @param file File containing audit events
     * @return boolean true if successful, false otherwise
     */
    public boolean logFile(File file);
    
    /**
     * Initialize the audit handler with configuration
     * @param props Properties configuration properties
     */
    public void init(Properties props);
    
    /**
     * Initialize the audit handler with base property name
     * @param props Properties configuration properties
     * @param basePropertyName String base property name for configuration
     */
    public void init(Properties props, String basePropertyName);
    
    /**
     * Start the audit handler
     */
    public void start();
    
    /**
     * Stop the audit handler
     */
    public void stop();
    
    /**
     * Wait for completion of pending operations
     */
    public void waitToComplete();
    
    /**
     * Wait for completion with timeout
     * @param timeout long timeout in milliseconds
     */
    public void waitToComplete(long timeout);
    
    /**
     * Get handler name for logging purposes
     * @return String handler name
     */
    public String getName();
    
    /**
     * Flush any pending audit events
     */
    public void flush();
}

/**
 * Primary audit event model for authorization events
 */
public class AuthzAuditEvent extends AuditEventBase {
    // Repository information
    public String getRepositoryName();
    public void setRepositoryName(String repositoryName);
    public int getRepositoryType();
    public void setRepositoryType(int repositoryType);
    
    // User and access information
    public String getUser();
    public void setUser(String user);
    public String getAccessType();
    public void setAccessType(String accessType);
    public short getAccessResult();
    public void setAccessResult(short accessResult);
    
    // Resource information
    public String getResourceType();
    public void setResourceType(String resourceType);
    public String getResourcePath();
    public void setResourcePath(String resourcePath);
    
    // Policy information
    public long getPolicyId();
    public void setPolicyId(long policyId);
    public String getPolicyVersion();
    public void setPolicyVersion(String policyVersion);
    
    // Event metadata
    public Date getEventTime();
    public void setEventTime(Date eventTime);
    public String getEventId();
    public void setEventId(String eventId);
    
    // Client information
    public String getClientIP();
    public void setClientIP(String clientIP);
    public String getClientType();
    public void setClientType(String clientType);
    
    // Additional fields
    public String getAction();
    public void setAction(String action);
    public String getRequestData();
    public void setRequestData(String requestData);
    public String getResultReason();
    public void setResultReason(String resultReason);
    
    // JSON serialization
    public String toJson();
    public void fromJson(String jsonString);
}

/**
 * Base implementation for audit handlers with common functionality
 */
public abstract class BaseAuditHandler implements AuditHandler {
    /**
     * Initialize the handler with properties
     * @param props Properties configuration properties
     */
    public void init(Properties props);
    
    /**
     * Log a single audit event (delegates to concrete implementation)
     * @param event AuditEventBase event to log
     */
    public void log(AuditEventBase event);
    
    /**
     * Log JSON string event (delegates to concrete implementation)
     * @param event String JSON-formatted event
     */
    public void logJSON(String event);
    
    /**
     * Log audit events from file (delegates to concrete implementation)
     * @param file File containing audit events
     */
    public void logFile(File file);
    
    // Statistics methods
    public long getErrorLogCount();
    public long getSuccessLogCount();  
    public long getStashedLogCount();
    public int getQueueSize();
    
    // Status and lifecycle methods
    public boolean isFlushPending();
    public void logStatusIfRequired();
    public String getName();
    public void setName(String name);
    public boolean stop(boolean isWaitToComplete);
}

import org.apache.ranger.audit.provider.AuditProviderFactory;
import org.apache.ranger.audit.provider.AuditHandler;
import org.apache.ranger.audit.model.AuthzAuditEvent;
import org.apache.ranger.audit.model.EnumRepositoryType;

// Initialize audit framework
Properties auditProps = new Properties();
auditProps.setProperty("xasecure.audit.is.enabled", "true");
auditProps.setProperty("xasecure.audit.hdfs.is.enabled", "true");

AuditProviderFactory factory = AuditProviderFactory.getInstance();
factory.init(auditProps, "ranger-plugin");

// Get audit provider
AuditHandler auditProvider = factory.getAuditProvider();

// Create audit event
AuthzAuditEvent event = new AuthzAuditEvent();
event.setRepositoryName("hdfs-service");
event.setRepositoryType(EnumRepositoryType.HDFS);
event.setUser("alice");
event.setAccessType("read");
event.setResourcePath("/data/sensitive");
event.setAccessResult(1); // ALLOWED
event.setEventTime(new Date());

// Log the event
auditProvider.log(event);

// Batch logging
List<AuditEventBase> events = Arrays.asList(event1, event2, event3);
auditProvider.log(events);

// JSON logging
String jsonEvent = event.toJson();
auditProvider.logJSON(jsonEvent);

/**
 * Comprehensive utility class with essential system-level functions
 */
public class MiscUtil {
    // Token replacement constants
    public static final String TOKEN_START = "%";
    public static final String TOKEN_END = "%";
    public static final String TOKEN_HOSTNAME = "hostname";
    public static final String TOKEN_APP_TYPE = "app-type";
    public static final String TOKEN_JVM_INSTANCE = "jvm-instance";
    public static final String TOKEN_TIME = "time:";
    public static final String TOKEN_PROPERTY = "property:";
    public static final String TOKEN_ENV = "env:";
    
    // Token replacement utilities
    public static String replaceTokens(String str, long time);
    
    // System information utilities
    public static String getHostname();
    public static void setApplicationType(String applicationType);
    public static String getApplicationType();
    public static String getJvmInstanceId();
    public static String getSystemProperty(String propertyName);
    public static String getEnv(String envName);
    public static String getFormattedTime(long time, String format);
    
    // File and directory operations
    public static void createParents(File file);
    
    // Time and rollover management
    public static long getNextRolloverTime(long lastRolloverTime, long interval);
    public static long getRolloverStartTime(long nextRolloverTime, long interval);
    
    // Parsing and conversion utilities
    public static int parseInteger(String str, int defValue);
    public static int toInt(Object value);
    public static long toLong(Object value);
    public static Date toDate(Object value);
    public static Date toLocalDate(Object value);
    
    // UUID and GUID generation
    public static String generateUniqueId();
    public static String generateGuid();
    
    // JSON serialization/deserialization
    public static ObjectMapper getMapper();
    public static <T> String stringify(T log);
    public static <T> T fromJson(String jsonStr, Class<T> clazz);
    
    // Properties management
    public static String getStringProperty(Properties props, String propName);
    public static String getStringProperty(Properties props, String propName, String defValue);
    public static boolean getBooleanProperty(Properties props, String propName, boolean defValue);
    public static int getIntProperty(Properties props, String propName, int defValue);
    public static long getLongProperty(Properties props, String propName, long defValue);
    public static Map<String, String> getPropertiesWithPrefix(Properties props, String prefix);
    
    // Collection utilities
    public static List<String> toArray(String destListStr, String delim);
    
    // Security and authentication methods
    public static String getCredentialString(String url, String alias);
    public static UserGroupInformation createUGIFromSubject(Subject subject);
    public static void setUGILoginUser(UserGroupInformation newUGI, Subject newSubject);
    public static UserGroupInformation getUGILoginUser();
    public static Subject getSubjectLoginUser();
    public static <X> X executePrivilegedAction(final PrivilegedExceptionAction<X> action);
    public static <X> X executePrivilegedAction(final PrivilegedAction<X> action);
    
    // Kerberos authentication
    public static String getKerberosNamesRules();
    public static String getShortNameFromPrincipalName(String principal);
    public static Set<String> getGroupsForRequestUser(String userName);
    public static void setUGIFromJAASConfig(String jaasConfigAppName);
    public static void authWithKerberos(String keytab, String principal, String nameRules);
    public static void loginWithKeyTab(String keytab, String principal, String nameRules);
    public static UserGroupInformation getLoginUser();
    
    // UTC date utilities
    public static Date getUTCDateForLocalDate(Date date);
    public static Date getUTCDate();
    
    // Logging utilities
    public static boolean logErrorMessageByInterval(Logger useLogger, String message);
    public static boolean logErrorMessageByInterval(Logger useLogger, String message, Throwable e);
}