feat(jdk8): move files to new folder to avoid resources compiled.

jdkSrc/jdk8/com/sun/jndi/ldap/ServiceLocator.java

@@ -0,0 +1,310 @@
+/*
+ * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.jndi.ldap;
+
+import java.util.*;
+
+import javax.naming.*;
+import javax.naming.directory.*;
+import javax.naming.spi.NamingManager;
+import javax.naming.ldap.LdapName;
+import javax.naming.ldap.Rdn;
+
+/**
+ * This class discovers the location of LDAP services by querying DNS.
+ * See http://www.ietf.org/internet-drafts/draft-ietf-ldapext-locate-07.txt
+ */
+
+class ServiceLocator {
+
+    private static final String SRV_RR = "SRV";
+
+    private static final String[] SRV_RR_ATTR = new String[]{SRV_RR};
+
+    private static final Random random = new Random();
+
+    private ServiceLocator() {
+    }
+
+    /**
+     * Maps a distinguished name (RFC 2253) to a fully qualified domain name.
+     * Processes a sequence of RDNs having a DC attribute.
+     * The special RDN "DC=." denotes the root of the domain tree.
+     * Multi-valued RDNs, non-DC attributes, binary-valued attributes and the
+     * RDN "DC=." all reset the domain name and processing continues.
+     *
+     * @param dn A string distinguished name (RFC 2253).
+     * @return A domain name or null if none can be derived.
+     * @throw InvalidNameException If the distinugished name is invalid.
+     */
+    static String mapDnToDomainName(String dn) throws InvalidNameException {
+        if (dn == null) {
+            return null;
+        }
+        StringBuffer domain = new StringBuffer();
+        LdapName ldapName = new LdapName(dn);
+
+        // process RDNs left-to-right
+        //List<Rdn> rdnList = ldapName.getRdns();
+
+        List<Rdn> rdnList = ldapName.getRdns();
+        for (int i = rdnList.size() - 1; i >= 0; i--) {
+            //Rdn rdn = rdnList.get(i);
+            Rdn rdn = rdnList.get(i);
+
+            // single-valued RDN with a DC attribute
+            if ((rdn.size() == 1) &&
+                ("dc".equalsIgnoreCase(rdn.getType()) )) {
+                Object attrval = rdn.getValue();
+                if (attrval instanceof String) {
+                    if (attrval.equals(".") ||
+                        (domain.length() == 1 && domain.charAt(0) == '.')) {
+                        domain.setLength(0); // reset (when current or previous
+                                             //        RDN value is "DC=.")
+                    }
+                    if (domain.length() > 0) {
+                        domain.append('.');
+                    }
+                    domain.append(attrval);
+                } else {
+                    domain.setLength(0); // reset (when binary-valued attribute)
+                }
+            } else {
+                domain.setLength(0); // reset (when multi-valued RDN or non-DC)
+            }
+        }
+        return (domain.length() != 0) ? domain.toString() : null;
+    }
+
+    /**
+     * Locates the LDAP service for a given domain.
+     * Queries DNS for a list of LDAP Service Location Records (SRV) for a
+     * given domain name.
+     *
+     * @param domainName A string domain name.
+     * @param environment The possibly null environment of the context.
+     * @return An ordered list of hostports for the LDAP service or null if
+     *         the service has not been located.
+     */
+    static String[] getLdapService(String domainName, Map<?,?> environment) {
+        if (environment instanceof Hashtable) {
+            return getLdapService(domainName, (Hashtable)environment);
+        }
+        return getLdapService(domainName, new Hashtable<>(environment));
+    }
+
+    /**
+     * Locates the LDAP service for a given domain.
+     * Queries DNS for a list of LDAP Service Location Records (SRV) for a
+     * given domain name.
+     *
+     * @param domainName A string domain name.
+     * @param environment The possibly null environment of the context.
+     * @return An ordered list of hostports for the LDAP service or null if
+     *         the service has not been located.
+     */
+    static String[] getLdapService(String domainName, Hashtable<?,?> environment) {
+
+        if (domainName == null || domainName.length() == 0) {
+            return null;
+        }
+
+        String dnsUrl = "dns:///_ldap._tcp." + domainName;
+        String[] hostports = null;
+
+        try {
+            // Create the DNS context using NamingManager rather than using
+            // the initial context constructor. This avoids having the initial
+            // context constructor call itself (when processing the URL
+            // argument in the getAttributes call).
+            Context ctx = NamingManager.getURLContext("dns", environment);
+            if (!(ctx instanceof DirContext)) {
+                return null; // cannot create a DNS context
+            }
+            Attributes attrs =
+                ((DirContext)ctx).getAttributes(dnsUrl, SRV_RR_ATTR);
+            Attribute attr;
+
+            if (attrs != null && ((attr = attrs.get(SRV_RR)) != null)) {
+                int numValues = attr.size();
+                int numRecords = 0;
+                SrvRecord[] srvRecords = new SrvRecord[numValues];
+
+                // create the service records
+                int i = 0;
+                int j = 0;
+                while (i < numValues) {
+                    try {
+                        srvRecords[j] = new SrvRecord((String) attr.get(i));
+                        j++;
+                    } catch (Exception e) {
+                        // ignore bad value
+                    }
+                    i++;
+                }
+                numRecords = j;
+
+                // trim
+                if (numRecords < numValues) {
+                    SrvRecord[] trimmed = new SrvRecord[numRecords];
+                    System.arraycopy(srvRecords, 0, trimmed, 0, numRecords);
+                    srvRecords = trimmed;
+                }
+
+                // Sort the service records in ascending order of their
+                // priority value. For records with equal priority, move
+                // those with weight 0 to the top of the list.
+                if (numRecords > 1) {
+                    Arrays.sort(srvRecords);
+                }
+
+                // extract the host and port number from each service record
+                hostports = extractHostports(srvRecords);
+            }
+        } catch (NamingException e) {
+            // ignore
+        }
+        return hostports;
+    }
+
+    /**
+     * Extract hosts and port numbers from a list of SRV records.
+     * An array of hostports is returned or null if none were found.
+     */
+    private static String[] extractHostports(SrvRecord[] srvRecords) {
+        String[] hostports = null;
+
+        int head = 0;
+        int tail = 0;
+        int sublistLength = 0;
+        int k = 0;
+        for (int i = 0; i < srvRecords.length; i++) {
+            if (hostports == null) {
+                hostports = new String[srvRecords.length];
+            }
+            // find the head and tail of the list of records having the same
+            // priority value.
+            head = i;
+            while (i < srvRecords.length - 1 &&
+                srvRecords[i].priority == srvRecords[i + 1].priority) {
+                i++;
+            }
+            tail = i;
+
+            // select hostports from the sublist
+            sublistLength = (tail - head) + 1;
+            for (int j = 0; j < sublistLength; j++) {
+                hostports[k++] = selectHostport(srvRecords, head, tail);
+            }
+        }
+        return hostports;
+    }
+
+    /*
+     * Randomly select a service record in the range [head, tail] and return
+     * its hostport value. Follows the algorithm in RFC 2782.
+     */
+    private static String selectHostport(SrvRecord[] srvRecords, int head,
+            int tail) {
+        if (head == tail) {
+            return srvRecords[head].hostport;
+        }
+
+        // compute the running sum for records between head and tail
+        int sum = 0;
+        for (int i = head; i <= tail; i++) {
+            if (srvRecords[i] != null) {
+                sum += srvRecords[i].weight;
+                srvRecords[i].sum = sum;
+            }
+        }
+        String hostport = null;
+
+        // If all records have zero weight, select first available one;
+        // otherwise, randomly select a record according to its weight
+        int target = (sum == 0 ? 0 : random.nextInt(sum + 1));
+        for (int i = head; i <= tail; i++) {
+            if (srvRecords[i] != null && srvRecords[i].sum >= target) {
+                hostport = srvRecords[i].hostport;
+                srvRecords[i] = null; // make this record unavailable
+                break;
+            }
+        }
+        return hostport;
+    }
+
+/**
+ * This class holds a DNS service (SRV) record.
+ * See http://www.ietf.org/rfc/rfc2782.txt
+ */
+
+static class SrvRecord implements Comparable<SrvRecord> {
+
+    int priority;
+    int weight;
+    int sum;
+    String hostport;
+
+    /**
+     * Creates a service record object from a string record.
+     * DNS supplies the string record in the following format:
+     * <pre>
+     *     <Priority> " " <Weight> " " <Port> " " <Host>
+     * </pre>
+     */
+    SrvRecord(String srvRecord) throws Exception {
+        StringTokenizer tokenizer = new StringTokenizer(srvRecord, " ");
+        String port;
+
+        if (tokenizer.countTokens() == 4) {
+            priority = Integer.parseInt(tokenizer.nextToken());
+            weight = Integer.parseInt(tokenizer.nextToken());
+            port = tokenizer.nextToken();
+            hostport = tokenizer.nextToken() + ":" + port;
+        } else {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    /*
+     * Sort records in ascending order of priority value. For records with
+     * equal priority move those with weight 0 to the top of the list.
+     */
+    public int compareTo(SrvRecord that) {
+        if (priority > that.priority) {
+            return 1; // this > that
+        } else if (priority < that.priority) {
+            return -1; // this < that
+        } else if (weight == 0 && that.weight != 0) {
+            return -1; // this < that
+        } else if (weight != 0 && that.weight == 0) {
+            return 1; // this > that
+        } else {
+            return 0; // this == that
+        }
+    }
+}
+}