Example usage for org.apache.hadoop.hdfs.server.namenode NameNodeHttpServer getNameNodeFromContext

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.server.namenode NameNodeHttpServer getNameNodeFromContext.

Prototype

public static NameNode getNameNodeFromContext(ServletContext context) 

Source Link

Usage

From source file:org.apache.hawq.pxf.service.utilities.SecuredHDFS.java

License:Apache License

/**
 * The function will verify the token with NameNode if available and will
 * create a UserGroupInformation.//from w  ww. j a  v a2s  .c o  m
 *
 * Code in this function is copied from JspHelper.getTokenUGI
 *
 * @param identifier Delegation token identifier
 * @param password Delegation token password
 * @param kind the kind of token
 * @param service the service for this token
 * @param servletContext Jetty servlet context which contains the NN address
 *
 * @throws SecurityException Thrown when authentication fails
 */
private static void verifyToken(byte[] identifier, byte[] password, Text kind, Text service,
        ServletContext servletContext) {
    try {
        Token<DelegationTokenIdentifier> token = new Token<DelegationTokenIdentifier>(identifier, password,
                kind, service);

        ByteArrayInputStream buf = new ByteArrayInputStream(token.getIdentifier());
        DataInputStream in = new DataInputStream(buf);
        DelegationTokenIdentifier id = new DelegationTokenIdentifier();
        id.readFields(in);

        final NameNode nn = NameNodeHttpServer.getNameNodeFromContext(servletContext);
        if (nn != null) {
            nn.getNamesystem().verifyToken(id, token.getPassword());
        }

        UserGroupInformation userGroupInformation = id.getUser();
        userGroupInformation.addToken(token);
        LOG.debug("user " + userGroupInformation.getUserName() + " (" + userGroupInformation.getShortUserName()
                + ") authenticated");

        // re-login if necessary
        userGroupInformation.checkTGTAndReloginFromKeytab();
    } catch (IOException e) {
        throw new SecurityException("Failed to verify delegation token " + e, e);
    }
}

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