JAL-3633 Apply (proxy) button enabled when needed
[jalview.git] / src / jalview / bin / Cache.java
index b6ff253..594046f 100755 (executable)
  */
 package jalview.bin;
 
-import jalview.datamodel.PDBEntry;
-import jalview.gui.UserDefinedColours;
-import jalview.schemes.ColourSchemeLoader;
-import jalview.schemes.ColourSchemes;
-import jalview.schemes.UserColourScheme;
-import jalview.structure.StructureImportSettings;
-import jalview.urls.IdOrgSettings;
-import jalview.util.ColorUtils;
-import jalview.util.Platform;
-import jalview.ws.sifts.SiftsSettings;
-
 import java.awt.Color;
 import java.io.BufferedReader;
 import java.io.File;
@@ -38,8 +27,14 @@ import java.io.FileInputStream;
 import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.net.Authenticator;
+import java.net.PasswordAuthentication;
+import java.net.URL;
 import java.text.DateFormat;
 import java.text.SimpleDateFormat;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.Date;
 import java.util.Enumeration;
@@ -47,12 +42,29 @@ import java.util.Locale;
 import java.util.Properties;
 import java.util.StringTokenizer;
 import java.util.TreeSet;
+import java.util.regex.Pattern;
+
+import javax.swing.LookAndFeel;
+import javax.swing.UIManager;
 
 import org.apache.log4j.ConsoleAppender;
 import org.apache.log4j.Level;
 import org.apache.log4j.Logger;
 import org.apache.log4j.SimpleLayout;
 
+import jalview.datamodel.PDBEntry;
+import jalview.gui.Preferences;
+import jalview.gui.UserDefinedColours;
+import jalview.schemes.ColourSchemeLoader;
+import jalview.schemes.ColourSchemes;
+import jalview.schemes.UserColourScheme;
+import jalview.structure.StructureImportSettings;
+import jalview.urls.IdOrgSettings;
+import jalview.util.ColorUtils;
+import jalview.util.MessageManager;
+import jalview.util.Platform;
+import jalview.ws.sifts.SiftsSettings;
+
 /**
  * Stores and retrieves Jalview Application Properties Lists and fields within
  * list entries are separated by '|' symbols unless otherwise stated (|) clauses
@@ -264,6 +276,28 @@ public class Cache
    */
   public static Logger log;
 
+  // save the proxy properties set at startup
+  public final static String[] startupProxyProperties = {
+      System.getProperty("http.proxyHost"),
+      System.getProperty("http.proxyPort"),
+      System.getProperty("https.proxyHost"),
+      System.getProperty("https.proxyPort"),
+      System.getProperty("http.proxyUser"),
+      System.getProperty("http.proxyPassword"),
+      System.getProperty("https.proxyUser"),
+      System.getProperty("https.proxyPassword"),
+      System.getProperty("http.nonProxyHosts") };
+
+  public final static String PROXYTYPE_NONE = "none";
+
+  // "false" and "true" for backward compatibility
+  public final static String PROXYTYPE_SYSTEM = "false";
+
+  public final static String PROXYTYPE_CUSTOM = "true";
+
+  // in-memory only storage of proxy password, safer to use char array
+  public static char[] proxyAuthPassword = null;
+
   /** Jalview Properties */
   public static Properties applicationProperties = new Properties()
   {
@@ -312,6 +346,10 @@ public class Cache
       // lcastor = Logger.getLogger("org.exolab.castor.xml.Marshaller");
       // lcastor.setLevel(Level.toLevel(Cache.getDefault("logs.Castor.Level",
       // Level.INFO.toString())));
+      // we shouldn't need to do this
+      org.apache.log4j.Logger.getRootLogger()
+              .setLevel(org.apache.log4j.Level.INFO);
+
       jalview.bin.Cache.log.setLevel(Level.toLevel(Cache
               .getDefault("logs.Jalview.level", Level.INFO.toString())));
       // laxis.addAppender(ap);
@@ -356,7 +394,7 @@ public class Cache
         InputStream fis;
         try
         {
-          fis = new java.net.URL(propertiesFile).openStream();
+          fis = new URL(propertiesFile).openStream();
           System.out.println(
                   "Loading jalview properties from : " + propertiesFile);
           System.out.println(
@@ -383,29 +421,53 @@ public class Cache
         System.out.println("Error reading properties file: " + ex);
       }
     }
+
+    /* TO BE REPLACED WITH PROXY_TYPE SETTINGS 
     if (getDefault("USE_PROXY", false))
     {
       String proxyServer = getDefault("PROXY_SERVER", ""),
               proxyPort = getDefault("PROXY_PORT", "8080");
+    }
+    */
 
-      System.out.println("Using proxyServer: " + proxyServer
-              + " proxyPort: " + proxyPort);
-
-      System.setProperty("http.proxyHost", proxyServer);
-      System.setProperty("http.proxyPort", proxyPort);
+    // PROXY TYPE settings (now three options "none", "false", "true", but using
+    // backward compatible strings)
+    String proxyType = getDefault("USE_PROXY", PROXYTYPE_SYSTEM);
+    // default to upgrading old settings
+    switch (proxyType)
+    {
+    case PROXYTYPE_NONE:
+      clearProxyProperties();
+      break;
+    case PROXYTYPE_SYSTEM: // use system settings
+      resetProxyProperties();
+      break;
+    case PROXYTYPE_CUSTOM: // use specified proxy settings
+      String httpHost = getDefault("PROXY_SERVER", "");
+      String httpPort = getDefault("PROXY_PORT", "8080");
+      String httpsHost = getDefault("PROXY_SERVER_HTTPS", httpHost);
+      String httpsPort = getDefault("PROXY_PORT_HTTPS", httpPort);
+      String httpUser = getDefault("PROXY_AUTH_USER", null);
+      // https.proxyUser and https.proxyPassword are not able to be
+      // independently set in Preferences yet (or http.nonProxyHosts)
+      String httpsUser = getDefault("PROXY_AUTH_USER_HTTPS", httpUser);
+      setProxyProperties(httpHost, httpPort, httpsHost, httpsPort, httpUser,
+              proxyAuthPassword, httpsUser, proxyAuthPassword, "localhost");
+      break;
+    default:
+      String message = "Incorrect PROXY_TYPE - should be 'none' (clear proxy properties), 'false' (system settings), 'true' (custom settings): "
+              + proxyType;
+      Cache.warn(message);
     }
 
     // LOAD THE AUTHORS FROM THE authors.props file
-    String authorDetails = (Platform.isJS() ? null
-            : "jar:".concat(Cache.class.getProtectionDomain()
-                    .getCodeSource().getLocation().toString()
-                    .concat("!/authors.props")));
+    String authorDetails = resolveResourceURLFor("/authors.props");
 
     try
     {
       if (authorDetails != null)
       {
-        java.net.URL localJarFileURL = new java.net.URL(authorDetails);
+        URL localJarFileURL = new URL(authorDetails);
         InputStream in = localJarFileURL.openStream();
         applicationProperties.load(in);
         in.close();
@@ -417,51 +479,12 @@ public class Cache
     }
     if (authorDetails == null)
     {
-        applicationProperties.remove("AUTHORS");
-        applicationProperties.remove("AUTHORFNAMES");
-        applicationProperties.remove("YEAR");
+      applicationProperties.remove("AUTHORS");
+      applicationProperties.remove("AUTHORFNAMES");
+      applicationProperties.remove("YEAR");
     }
 
-    // FIND THE VERSION NUMBER AND BUILD DATE FROM jalview.jar
-    // MUST FOLLOW READING OF LOCAL PROPERTIES FILE AS THE
-    // VERSION MAY HAVE CHANGED SINCE LAST USING JALVIEW
-    String buildDetails = (Platform.isJS() ? null
-            : "jar:".concat(Cache.class.getProtectionDomain()
-                    .getCodeSource().getLocation().toString()
-                    .concat("!/.build_properties")));
-    if (buildDetails != null)
-    {
-      try
-      {
-        java.net.URL localJarFileURL = new java.net.URL(buildDetails);
-        InputStream in = localJarFileURL.openStream();
-        applicationProperties.load(in);
-        in.close();
-      } catch (Exception ex)
-      {
-        System.out.println("Error reading build details: " + ex);
-        buildDetails = null;
-      }
-    }
-    if (buildDetails == null)
-    {
-        applicationProperties.remove("VERSION");
-    }
-    String jnlpVersion = System.getProperty("jalview.version");
-    String codeVersion = getProperty("VERSION");
-    String codeInstallation = getProperty("INSTALLATION");
-    if (codeVersion == null)
-    {
-      // THIS SHOULD ONLY BE THE CASE WHEN TESTING!!
-      codeVersion = "Test";
-      jnlpVersion = "Test";
-      codeInstallation = "";
-    }
-    else
-    {
-      codeInstallation = " (" + codeInstallation + ")";
-    }
-    new BuildDetails(codeVersion, null, codeInstallation);
+    loadBuildProperties(false);
 
     SiftsSettings
             .setMapWithSifts(Cache.getDefault("MAP_WITH_SIFTS", false));
@@ -481,9 +504,6 @@ public class Cache
             "http://www.jalview.org/services/identifiers"));
     IdOrgSettings.setDownloadLocation(ID_ORG_FILE);
 
-    System.out
-            .println("Jalview Version: " + codeVersion + codeInstallation);
-
     StructureImportSettings.setDefaultStructureFileFormat(jalview.bin.Cache
             .getDefault("PDB_DOWNLOAD_FORMAT", PDB_DOWNLOAD_FORMAT));
     StructureImportSettings
@@ -491,8 +511,13 @@ public class Cache
     // StructureImportSettings
     // .setDefaultPDBFileParser(jalview.bin.Cache.getDefault(
     // "DEFAULT_PDB_FILE_PARSER", DEFAULT_PDB_FILE_PARSER));
-    // jnlpVersion will be null if we're using InstallAnywhere
+
+    String jnlpVersion = System.getProperty("jalview.version");
+
+    // jnlpVersion will be null if a latest version check for the channel needs
+    // to be done
     // Dont do this check if running in headless mode
+
     if (jnlpVersion == null && getDefault("VERSION_CHECK", true)
             && (System.getProperty("java.awt.headless") == null || System
                     .getProperty("java.awt.headless").equals("false")))
@@ -563,15 +588,83 @@ public class Cache
       }
     }
 
-    setProperty("VERSION", codeVersion);
-
     // LOAD USERDEFINED COLOURS
-    jalview.bin.Cache
-            .initUserColourSchemes(getProperty("USER_DEFINED_COLOURS"));
+    Cache.initUserColourSchemes(getProperty("USER_DEFINED_COLOURS"));
     jalview.io.PIRFile.useModellerOutput = Cache.getDefault("PIR_MODELLER",
             false);
   }
 
+  /**
+   * construct a resource URL for the given absolute resource pathname
+   * 
+   * @param resourcePath
+   * @return
+   */
+  private static String resolveResourceURLFor(String resourcePath)
+  {
+    String url = null;
+    if (Platform.isJS() || !Cache.class.getProtectionDomain()
+            .getCodeSource().getLocation().toString().endsWith(".jar"))
+    {
+      try
+      {
+        url = Cache.class.getResource(resourcePath).toString();
+      } catch (Exception ex)
+      {
+        System.err.println("Failed to resolve resource " + resourcePath
+                + ": " + ex.getMessage());
+      }
+    }
+    else
+    {
+      url = "jar:".concat(Cache.class.getProtectionDomain().getCodeSource()
+              .getLocation().toString().concat("!" + resourcePath));
+    }
+    return url;
+  }
+
+  public static void loadBuildProperties(boolean reportVersion)
+  {
+    String codeInstallation = getProperty("INSTALLATION");
+    boolean printVersion = codeInstallation == null;
+
+    /*
+     * read build properties - from the Jalview jar for a Java distribution,
+     * or from codebase file in test or JalviewJS context
+     */
+    try
+    {
+      String buildDetails = resolveResourceURLFor("/.build_properties");
+      URL localJarFileURL = new URL(buildDetails);
+      InputStream in = localJarFileURL.openStream();
+      applicationProperties.load(in);
+      in.close();
+    } catch (Exception ex)
+    {
+      System.out.println("Error reading build details: " + ex);
+      applicationProperties.remove("VERSION");
+    }
+    String codeVersion = getProperty("VERSION");
+    codeInstallation = getProperty("INSTALLATION");
+
+    if (codeVersion == null)
+    {
+      // THIS SHOULD ONLY BE THE CASE WHEN TESTING!!
+      codeVersion = "Test";
+      codeInstallation = "";
+    }
+    else
+    {
+      codeInstallation = " (" + codeInstallation + ")";
+    }
+    setProperty("VERSION", codeVersion);
+    new BuildDetails(codeVersion, null, codeInstallation);
+    if (printVersion && reportVersion)
+    {
+      System.out.println(
+              "Jalview Version: " + codeVersion + codeInstallation);
+    }
+  }
 
   private static void deleteBuildProperties()
   {
@@ -664,7 +757,7 @@ public class Cache
     try
     {
       oldValue = applicationProperties.setProperty(key, obj);
-      if (!propsAreReadOnly)
+      if (propertiesFile != null && !propsAreReadOnly)
       {
         FileOutputStream out = new FileOutputStream(propertiesFile);
         applicationProperties.store(out, "---JalviewX Properties File---");
@@ -1088,4 +1181,419 @@ public class Cache
     }
   }
 
-}
+  /**
+   * Initial logging information helper for various versions output
+   * 
+   * @param prefix
+   * @param value
+   * @param defaultValue
+   */
+  private static void appendIfNotNull(StringBuilder sb, String prefix,
+          String value, String suffix, String defaultValue)
+  {
+    if (value == null && defaultValue == null)
+    {
+      return;
+    }
+    String line = prefix + (value != null ? value : defaultValue) + suffix;
+    sb.append(line);
+  }
+
+  /**
+   * 
+   * @return Jalview version, build details and JVM platform version for console
+   */
+  public static String getVersionDetailsForConsole()
+  {
+    StringBuilder sb = new StringBuilder();
+    sb.append("Jalview Version: ");
+    sb.append(jalview.bin.Cache.getDefault("VERSION", "TEST"));
+    sb.append("\n");
+    sb.append("Jalview Installation: ");
+    sb.append(jalview.bin.Cache.getDefault("INSTALLATION", "unknown"));
+    sb.append("\n");
+    sb.append("Build Date: ");
+    sb.append(jalview.bin.Cache.getDefault("BUILD_DATE", "unknown"));
+    sb.append("\n");
+    sb.append("Java version: ");
+    sb.append(System.getProperty("java.version"));
+    sb.append("\n");
+    sb.append(System.getProperty("os.arch"));
+    sb.append(" ");
+    sb.append(System.getProperty("os.name"));
+    sb.append(" ");
+    sb.append(System.getProperty("os.version"));
+    sb.append("\n");
+    appendIfNotNull(sb, "Install4j version: ",
+            System.getProperty("sys.install4jVersion"), "\n", null);
+    appendIfNotNull(sb, "Install4j template version: ",
+            System.getProperty("installer_template_version"), "\n", null);
+    appendIfNotNull(sb, "Launcher version: ",
+            System.getProperty("launcher_version"), "\n", null);
+    LookAndFeel laf = UIManager.getLookAndFeel();
+    String lafName = laf == null ? "Not obtained" : laf.getName();
+    String lafClass = laf == null ? "unknown" : laf.getClass().getName();
+    sb.append("LookAndFeel: ");
+    sb.append(lafName);
+    sb.append(" (");
+    sb.append(lafClass);
+    sb.append(")\n");
+    // Not displayed in release version ( determined by possible version number
+    // regex 9[9.]*9[.-_a9]* )
+    if (Pattern.matches("^\\d[\\d\\.]*\\d[\\.\\-\\w]*$",
+            jalview.bin.Cache.getDefault("VERSION", "TEST")))
+    {
+      appendIfNotNull(sb, "Getdown appdir: ",
+              System.getProperty("getdownappdir"), "\n", null);
+      appendIfNotNull(sb, "Java home: ", System.getProperty("java.home"),
+              "\n", "unknown");
+    }
+    return sb.toString();
+  }
+
+  /**
+   * 
+   * @return build details as reported in splashscreen
+   */
+  public static String getBuildDetailsForSplash()
+  {
+    // consider returning more human friendly info
+    // eg 'built from Source' or update channel
+    return jalview.bin.Cache.getDefault("INSTALLATION", "unknown");
+  }
+
+  public static String getStackTraceString(Throwable t)
+  {
+    StringWriter sw = new StringWriter();
+    PrintWriter pw = new PrintWriter(sw);
+    t.printStackTrace(pw);
+    return sw.toString();
+  }
+
+  // proxy properties methods
+  public static void clearProxyProperties()
+  {
+    setProxyProperties(null, null, null, null, null, null, null, null,
+            null);
+  }
+
+  public static void resetProxyProperties()
+  {
+    setProxyProperties(startupProxyProperties[0], startupProxyProperties[1],
+            startupProxyProperties[2], startupProxyProperties[3],
+            startupProxyProperties[4],
+            startupProxyProperties[5] == null ? null
+                    : startupProxyProperties[5].toCharArray(),
+            startupProxyProperties[6],
+            startupProxyProperties[7] == null ? null
+                    : startupProxyProperties[7].toCharArray(),
+            startupProxyProperties[8]);
+    StringBuilder sb = new StringBuilder();
+    sb.append("Setting proxy properties to: http.proxyHost=")
+            .append(startupProxyProperties[0]).append(", http.proxyPort=")
+            .append(startupProxyProperties[1])
+            .append(startupProxyProperties[4] != null
+                    && !startupProxyProperties[4].isEmpty()
+                            ? " [" + startupProxyProperties[4] + "]"
+                            : "")
+            .append(", https.proxyHost=").append(startupProxyProperties[2])
+            .append(", https.proxyPort=").append(startupProxyProperties[3])
+            .append(startupProxyProperties[6] != null
+                    && !startupProxyProperties[6].isEmpty()
+                            ? " [" + startupProxyProperties[6] + "]"
+                            : "");
+
+    Cache.debug(sb.toString());
+  }
+
+  public static void setProxyPropertiesFromPreferences()
+  {
+    setProxyPropertiesFromPreferences(Cache.PROXYTYPE_SYSTEM);
+  }
+
+  public static void setProxyPropertiesFromPreferences(
+          String previousProxyType)
+  {
+    String proxyType = Cache.getDefault("USE_PROXY",
+            Cache.PROXYTYPE_SYSTEM);
+    if (previousProxyType != null
+            && !proxyType.equals(Cache.PROXYTYPE_CUSTOM) // always apply
+                                                         // customProxy
+            && proxyType.equals(previousProxyType))
+    {
+      // no change
+      return;
+    }
+    switch (proxyType)
+    {
+    case Cache.PROXYTYPE_NONE:
+      if (!previousProxyType.equals(proxyType))
+      {
+        Cache.log.info("Setting no proxy settings");
+        Cache.setProxyProperties(null, null, null, null, null, null, null,
+                null, null);
+      }
+      break;
+    case Cache.PROXYTYPE_CUSTOM:
+      // always re-set a custom proxy -- it might have changed, particularly
+      // password
+      Cache.log.info("Setting custom proxy settings");
+      boolean proxyAuthSet = Cache.getDefault("PROXY_AUTH", false);
+      Cache.setProxyProperties(Cache.getDefault("PROXY_SERVER", null),
+              Cache.getDefault("PROXY_PORT", null),
+              Cache.getDefault("PROXY_SERVER_HTTPS", null),
+              Cache.getDefault("PROXY_PORT_HTTPS", null),
+              proxyAuthSet ? Cache.getDefault("PROXY_AUTH_USERNAME", "")
+                      : null,
+              proxyAuthSet ? Cache.proxyAuthPassword : null,
+              proxyAuthSet ? Cache.getDefault("PROXY_AUTH_USERNAME", "")
+                      : null,
+              proxyAuthSet ? Cache.proxyAuthPassword : null, "localhost");
+      break;
+    default: // system proxy settings by default
+      Cache.log.info("Setting system proxy settings");
+      Cache.resetProxyProperties();
+    }
+  }
+
+  public static void setProxyProperties(String httpHost, String httpPort,
+          String httpsHost, String httpsPort, String httpUser,
+          char[] httpPassword, String httpsUser, char[] httpsPassword,
+          String nonProxyHosts)
+  {
+    setOrClearSystemProperty("http.proxyHost", httpHost);
+    setOrClearSystemProperty("http.proxyPort", httpPort);
+    setOrClearSystemProperty("https.proxyHost", httpsHost);
+    setOrClearSystemProperty("https.proxyPort", httpsPort);
+    setOrClearSystemProperty("http.proxyUser", httpUser);
+    setOrClearSystemProperty("https.proxyUser", httpsUser);
+    // note: passwords for http.proxyPassword and https.proxyPassword are sent
+    // via the Authenticator, properties do not need to be set
+
+    // are we using a custom proxy (password prompt might be required)?
+    boolean customProxySet = getDefault("USE_PROXY", PROXYTYPE_SYSTEM)
+            .equals(PROXYTYPE_CUSTOM);
+
+    /*
+     * A bug in Java means the AuthCache does not get reset, so once it has working credentials,
+     * it never asks for more, so changing the Authenticator has no effect (as getPasswordAuthentication()
+     * is not re-called).
+     * This could lead to password leak to a hostile proxy server, so I'm putting in a hack to clear
+     * the AuthCache.
+     * see https://www.generacodice.com/en/articolo/154918/Reset-the-Authenticator-credentials
+     * ...
+     * Turns out this is only accessible in Java 8, and not in Java 9 onwards, so commenting out
+     */
+    /*
+    try
+    {
+      sun.net.www.protocol.http.AuthCacheValue
+              .setAuthCache(new sun.net.www.protocol.http.AuthCacheImpl());
+    } catch (Throwable t)
+    {
+      Cache.error(t.getMessage());
+      Cache.debug(getStackTraceString(t));
+    }
+    */
+
+    if (httpUser != null || httpsUser != null)
+    {
+      try
+      {
+        char[] displayHttpPw = new char[httpPassword == null ? 0
+                : httpPassword.length];
+        Arrays.fill(displayHttpPw, '*');
+        Cache.debug("CACHE Proxy: setting new Authenticator with httpUser='"
+                + httpUser + "' httpPassword='" + displayHttpPw + "'");
+        Authenticator.setDefault(new Authenticator()
+        {
+          @Override
+          protected PasswordAuthentication getPasswordAuthentication()
+          {
+            if (getRequestorType() == RequestorType.PROXY)
+            {
+              String protocol = getRequestingProtocol();
+              boolean needProxyPasswordSet = false;
+              if (customProxySet &&
+              // we have a username but no password for the scheme being
+              // requested
+              (protocol.equalsIgnoreCase("http")
+                      && (httpUser != null && httpUser.length() > 0
+                              && (httpPassword == null
+                                      || httpPassword.length == 0)))
+                      || (protocol.equalsIgnoreCase("https")
+                              && (httpsUser != null
+                                      && httpsUser.length() > 0
+                                      && (httpsPassword == null
+                                              || httpsPassword.length == 0))))
+              {
+                // open Preferences -> Connections
+                String message = MessageManager
+                        .getString("label.proxy_password_required");
+                Preferences.openPreferences(Preferences.CONNECTIONS_TAB,
+                        message);
+                Preferences.getInstance().proxyAuthPasswordCheckHighlight(true);
+              }
+              else
+              {
+                try
+                {
+                  if (protocol.equalsIgnoreCase("http")
+                          && getRequestingHost().equalsIgnoreCase(httpHost)
+                          && getRequestingPort() == Integer
+                                  .valueOf(httpPort))
+                  {
+                    Cache.debug(
+                            "AUTHENTICATOR returning PasswordAuthentication(\""
+                                    + httpUser + "\", '"
+                                    + new String(displayHttpPw) + "')");
+                    return new PasswordAuthentication(httpUser,
+                            httpPassword);
+                  }
+                  if (protocol.equalsIgnoreCase("https")
+                          && getRequestingHost().equalsIgnoreCase(httpsHost)
+                          && getRequestingPort() == Integer
+                                  .valueOf(httpsPort))
+                  {
+                    char[] displayHttpsPw = new char[httpPassword.length];
+                    Arrays.fill(displayHttpsPw, '*');
+                    Cache.debug(
+                            "AUTHENTICATOR returning PasswordAuthentication(\""
+                                    + httpsUser + "\", '" + displayHttpsPw
+                                    + "'");
+                    return new PasswordAuthentication(httpsUser,
+                            httpsPassword);
+                  }
+                } catch (NumberFormatException e)
+                {
+                  Cache.error("Problem with proxy port values [http:"
+                          + httpPort + ", https:" + httpsPort + "]");
+                }
+                Cache.debug(
+                        "AUTHENTICATOR after trying to get PasswordAuthentication");
+              }
+            }
+            // non proxy request
+            Cache.debug("AUTHENTICATOR returning null");
+            return null;
+          }
+        });
+        // required to re-enable basic authentication (should be okay for a
+        // local proxy)
+        Cache.debug(
+                "AUTHENTICATOR setting property 'jdk.http.auth.tunneling.disabledSchemes' to \"\"");
+        System.setProperty("jdk.http.auth.tunneling.disabledSchemes", "");
+      } catch (SecurityException e)
+      {
+        Cache.error("Could not set default Authenticator");
+        Cache.debug(getStackTraceString(e));
+      }
+    }
+    else
+    {
+      // reset the Authenticator to protect http.proxyUser and
+      // http.proxyPassword Just In Case
+      /* as noted above, due to bug in java this doesn't work if the sun.net.www.protocol.http.AuthCache
+       * has working credentials. No workaround for Java 11.
+       */
+      Cache.debug("AUTHENTICATOR setting default Authenticator to null");
+      Authenticator.setDefault(null);
+    }
+
+    // nonProxyHosts not currently configurable in Preferences
+    Cache.debug("AUTHENTICATOR setting property 'http.nonProxyHosts' to \""
+            + nonProxyHosts + "\"");
+    setOrClearSystemProperty("http.nonProxyHosts", nonProxyHosts);
+  }
+
+  public static void setOrClearSystemProperty(String key, char[] value)
+  {
+    setOrClearSystemProperty(key,
+            (value == null) ? null : new String(value));
+  }
+
+  public static void setOrClearSystemProperty(String key, String value)
+  {
+    if (key == null)
+    {
+      return;
+    }
+    if (value == null)
+    {
+      System.clearProperty(key);
+    }
+    else
+    {
+      System.setProperty(key, value);
+    }
+  }
+
+  public final static int TRACE = 10;
+
+  public final static int DEBUG = 20;
+
+  public final static int INFO = 30;
+
+  public final static int WARN = 40;
+
+  public final static int ERROR = 50;
+
+  public static boolean println(int level, String message)
+  {
+    if (Cache.log == null)
+    {
+      if (level >= WARN)
+        System.err.println(message);
+      else if (level >= INFO)
+        System.out.println(message);
+      // not printing debug or trace messages
+      return false;
+    }
+    if (level >= ERROR)
+    {
+      Cache.log.error(message);
+    }
+    else if (level >= WARN)
+    {
+      Cache.log.warn(message);
+    }
+    else if (level >= INFO)
+    {
+      Cache.log.info(message);
+    }
+    else if (level >= DEBUG)
+    {
+      Cache.log.debug(message);
+    }
+    else
+    {
+      Cache.log.trace(message);
+    }
+    return true;
+  }
+
+  public static void trace(String message)
+  {
+    println(TRACE, message);
+  }
+
+  public static void debug(String message)
+  {
+    println(DEBUG, message);
+  }
+
+  public static void info(String message)
+  {
+    println(INFO, message);
+  }
+
+  public static void warn(String message)
+  {
+    println(WARN, message);
+  }
+
+  public static void error(String message)
+  {
+    println(ERROR, message);
+  }
+}
\ No newline at end of file