JAL-3280 Fixed the version checking URL formulation (getdown build_properties) for...
[jalview.git] / src / jalview / bin / Cache.java
index 35d6aa3..4a83b35 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.ws.sifts.SiftsSettings;
-
 import java.awt.Color;
 import java.io.BufferedReader;
 import java.io.File;
@@ -37,8 +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;
@@ -46,12 +42,30 @@ 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.ChannelProperties;
+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
@@ -263,6 +277,28 @@ 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()
   {
@@ -274,10 +310,15 @@ public class Cache
     }
   };
 
+  /* build Properties (not all saved to .jalview_properties) */
+  public static Properties buildProperties = new Properties();
+
   /** Default file is ~/.jalview_properties */
   static String propertiesFile;
 
-  private static boolean propsAreReadOnly = false;
+  private static boolean propsAreReadOnly = Platform.isJS();
+
+  private final static String JS_PROPERTY_PREFIX = "jalview_";
 
   public static void initLogger()
   {
@@ -309,13 +350,18 @@ 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);
       // lcastor.addAppender(ap);
       // jalview.bin.Cache.log.addAppender(ap);
       // Tell the user that debug is enabled
-      jalview.bin.Cache.log.debug("Jalview Debugging Output Follows.");
+      jalview.bin.Cache.log.debug(ChannelProperties.getProperty("app_name")
+              + " Debugging Output Follows.");
     } catch (Exception ex)
     {
       System.err.println("Problems initializing the log4j system\n");
@@ -330,7 +376,7 @@ public class Cache
   public static void loadProperties(String propsFile)
   {
     propertiesFile = propsFile;
-    if (propsFile == null)
+    if (propsFile == null && !propsAreReadOnly)
     {
       propertiesFile = System.getProperty("user.home") + File.separatorChar
               + ".jalview_properties";
@@ -341,65 +387,103 @@ public class Cache
       propsAreReadOnly = true;
     }
 
-    try
+    if (propertiesFile == null)
+    { // BH 2019
+      Platform.readInfoProperties(JS_PROPERTY_PREFIX,
+              applicationProperties);
+    }
+    else
     {
-      InputStream fis;
       try
       {
-        fis = new java.net.URL(propertiesFile).openStream();
-        System.out.println(
-                "Loading jalview properties from : " + propertiesFile);
-        System.out.println(
-                "Disabling Jalview writing to user's local properties file.");
-        propsAreReadOnly = true;
+        InputStream fis;
+        try
+        {
+          fis = new URL(propertiesFile).openStream();
+          System.out.println(
+                  "Loading jalview properties from : " + propertiesFile);
+          System.out.println(
+                  "Disabling Jalview writing to user's local properties file.");
+          propsAreReadOnly = true;
+
+        } catch (Exception ex)
+        {
+          fis = null;
+        }
+        if (fis == null)
+        {
+          fis = new FileInputStream(propertiesFile);
+        }
+        applicationProperties.clear();
+        applicationProperties.load(fis);
 
+        // remove any old build properties
+
+        deleteBuildProperties();
+        fis.close();
       } catch (Exception ex)
       {
-        fis = null;
-      }
-      if (fis == null)
-      {
-        fis = new FileInputStream(propertiesFile);
+        System.out.println("Error reading properties file: " + ex);
       }
-      applicationProperties.clear();
-      applicationProperties.load(fis);
-
-      // remove any old build properties
-
-      deleteBuildProperties();
-      fis.close();
-    } catch (Exception ex)
-    {
-      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 = resolveResourceURLFor("/authors.props");
+
     try
     {
-      String authorDetails = "jar:"
-              .concat(Cache.class.getProtectionDomain().getCodeSource()
-                      .getLocation().toString().concat("!/authors.props"));
-
-      java.net.URL localJarFileURL = new java.net.URL(authorDetails);
-
-      InputStream in = localJarFileURL.openStream();
-      applicationProperties.load(in);
-      in.close();
+      if (authorDetails != null)
+      {
+        URL localJarFileURL = new URL(authorDetails);
+        InputStream in = localJarFileURL.openStream();
+        applicationProperties.load(in);
+        in.close();
+      }
     } catch (Exception ex)
     {
       System.out.println("Error reading author details: " + ex);
+      authorDetails = null;
+    }
+    if (authorDetails == null)
+    {
       applicationProperties.remove("AUTHORS");
       applicationProperties.remove("AUTHORFNAMES");
       applicationProperties.remove("YEAR");
@@ -435,8 +519,8 @@ public class Cache
 
     String jnlpVersion = System.getProperty("jalview.version");
 
-    // jnlpVersion will be null if a latest version check for the channel needs to
-    // be done
+    // 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)
@@ -446,9 +530,13 @@ public class Cache
 
       class VersionChecker extends Thread
       {
+
         @Override
         public void run()
         {
+          String remoteBuildPropertiesUrl = Cache
+                  .getAppbaseBuildProperties();
+
           String orgtimeout = System
                   .getProperty("sun.net.client.defaultConnectTimeout");
           if (orgtimeout == null)
@@ -462,28 +550,19 @@ public class Cache
           {
             System.setProperty("sun.net.client.defaultConnectTimeout",
                     "5000");
-            java.net.URL url = new java.net.URL(Cache
-                    .getDefault("www.jalview.org", "http://www.jalview.org")
-                    + "/webstart/jalview.jnlp");
+            java.net.URL url = new java.net.URL(remoteBuildPropertiesUrl);
+
             BufferedReader in = new BufferedReader(
                     new InputStreamReader(url.openStream()));
-            String line = null;
-            while ((line = in.readLine()) != null)
-            {
-              if (line.indexOf("jalview.version") == -1)
-              {
-                continue;
-              }
 
-              line = line.substring(line.indexOf("value=") + 7);
-              line = line.substring(0, line.lastIndexOf("\""));
-              remoteVersion = line;
-              break;
-            }
+            Properties remoteBuildProperties = new Properties();
+            remoteBuildProperties.load(in);
+            remoteVersion = remoteBuildProperties.getProperty("VERSION");
           } catch (Exception ex)
           {
-            System.out.println(
-                    "Non-fatal exception when checking version at www.jalview.org :");
+            System.out
+                    .println("Non-fatal exception when checking version at "
+                            + remoteBuildPropertiesUrl + ":");
             System.out.println(ex);
             remoteVersion = getProperty("VERSION");
           }
@@ -510,29 +589,71 @@ public class Cache
     }
 
     // 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 printV = codeInstallation == null;
+    boolean printVersion = codeInstallation == null;
 
-    // FIND THE VERSION NUMBER AND BUILD DATE FROM jalview.jar
+    /*
+     * read build properties - from the Jalview jar for a Java distribution,
+     * or from codebase file in test or JalviewJS context
+     */
     try
     {
-      String buildDetails = "jar:".concat(Cache.class.getProtectionDomain()
-              .getCodeSource().getLocation().toString()
-              .concat("!/.build_properties"));
-
-      java.net.URL localJarFileURL = new java.net.URL(buildDetails);
-
+      String buildDetails = resolveResourceURLFor("/.build_properties");
+      URL localJarFileURL = new URL(buildDetails);
       InputStream in = localJarFileURL.openStream();
-      applicationProperties.load(in);
+      buildProperties.load(in);
       in.close();
+      if (buildProperties.getProperty("BUILD_DATE", null) != null)
+      {
+        applicationProperties.put("BUILD_DATE",
+                buildProperties.getProperty("BUILD_DATE"));
+      }
+      if (buildProperties.getProperty("INSTALLATION", null) != null)
+      {
+        applicationProperties.put("INSTALLATION",
+                buildProperties.getProperty("INSTALLATION"));
+      }
+      if (buildProperties.getProperty("VERSION", null) != null)
+      {
+        applicationProperties.put("VERSION",
+                buildProperties.getProperty("VERSION"));
+      }
     } catch (Exception ex)
     {
       System.out.println("Error reading build details: " + ex);
@@ -553,10 +674,10 @@ public class Cache
     }
     setProperty("VERSION", codeVersion);
     new BuildDetails(codeVersion, null, codeInstallation);
-    if (printV && reportVersion)
+    if (printVersion && reportVersion)
     {
-      System.out
-            .println("Jalview Version: " + codeVersion + codeInstallation);
+      System.out.println(ChannelProperties.getProperty("app_name")
+              + " Version: " + codeVersion + codeInstallation);
     }
   }
 
@@ -582,7 +703,13 @@ public class Cache
    */
   public static String getProperty(String key)
   {
-    return applicationProperties.getProperty(key);
+    String prop = applicationProperties.getProperty(key);
+    if (prop == null && Platform.isJS())
+    {
+      prop = applicationProperties.getProperty(Platform.getUniqueAppletID()
+              + "_" + JS_PROPERTY_PREFIX + key);
+    }
+    return prop;
   }
 
   /**
@@ -620,18 +747,13 @@ public class Cache
   }
 
   /**
-   * These methods are used when checking if the saved preference is different
-   * to the default setting
+   * Answers the value of the given property, or the supplied default value if
+   * the property is not set
    */
   public static String getDefault(String property, String def)
   {
-    String string = getProperty(property);
-    if (string != null)
-    {
-      return string;
-    }
-
-    return def;
+    String value = getProperty(property);
+    return value == null ? def : value;
   }
 
   /**
@@ -722,7 +844,8 @@ public class Cache
 
           lvclient.addAppender(log.getAppender("JalviewLogger"));
           // Tell the user that debug is enabled
-          lvclient.debug("Jalview Vamsas Client Debugging Output Follows.");
+          lvclient.debug(ChannelProperties.getProperty("app_name")
+                  + " Vamsas Client Debugging Output Follows.");
         }
       } catch (Exception e)
       {
@@ -761,7 +884,8 @@ public class Cache
 
           lgclient.addAppender(log.getAppender("JalviewLogger"));
           // Tell the user that debug is enabled
-          lgclient.debug("Jalview Groovy Client Debugging Output Follows.");
+          lgclient.debug(ChannelProperties.getProperty("app_name")
+                  + " Groovy Client Debugging Output Follows.");
         }
       } catch (Error e)
       {
@@ -823,7 +947,7 @@ public class Cache
                 .getConstructor(new Class[]
                 { String.class, String.class, String.class })
                 .newInstance(new Object[]
-                { "Jalview Desktop",
+                { ChannelProperties.getProperty("app_name") + " Desktop",
                     (vrs = jalview.bin.Cache.getProperty("VERSION") + "_"
                             + jalview.bin.Cache.getDefault("BUILD_DATE",
                                     "unknown")),
@@ -1099,16 +1223,25 @@ public class Cache
   public static String getVersionDetailsForConsole()
   {
     StringBuilder sb = new StringBuilder();
-    sb.append("Jalview Version: " + jalview.bin.Cache.getDefault("VERSION", "TEST"));
+    sb.append(ChannelProperties.getProperty("app_name"))
+            .append(" Version: ");
+    sb.append(jalview.bin.Cache.getDefault("VERSION", "TEST"));
     sb.append("\n");
-    sb.append("Jalview Installation: "
-            + jalview.bin.Cache.getDefault("INSTALLATION", "unknown"));
+    sb.append(ChannelProperties.getProperty("app_name"))
+            .append(" Installation: ");
+    sb.append(jalview.bin.Cache.getDefault("INSTALLATION", "unknown"));
     sb.append("\n");
-    sb.append("Build Date: " + jalview.bin.Cache.getDefault("BUILD_DATE", "unknown"));
+    sb.append("Build Date: ");
+    sb.append(jalview.bin.Cache.getDefault("BUILD_DATE", "unknown"));
     sb.append("\n");
-    sb.append("Java version: " + System.getProperty("java.version"));
+    sb.append("Java version: ");
+    sb.append(System.getProperty("java.version"));
     sb.append("\n");
-    sb.append(System.getProperty("os.arch") + " " + System.getProperty("os.name") + " " + System.getProperty("os.version"));
+    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);
@@ -1116,9 +1249,23 @@ public class Cache
             System.getProperty("installer_template_version"), "\n", null);
     appendIfNotNull(sb, "Launcher version: ",
             System.getProperty("launcher_version"), "\n", null);
-    if (jalview.bin.Cache.getDefault("VERSION", "TEST").equals("DEVELOPMENT")) {
+    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, "Getdown appbase: ",
+              System.getProperty("getdownappbase"), "\n", null);
       appendIfNotNull(sb, "Java home: ", System.getProperty("java.home"),
               "\n", "unknown");
     }
@@ -1135,4 +1282,434 @@ public class Cache
     // 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 + "'");
+        if (!Platform.isJS())
+        /* *
+         * java.net.Authenticator not implemented in SwingJS yet
+         * 
+         * @j2sIgnore
+         * 
+         */
+        {
+          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, 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;
+            }
+          });
+        } // end of j2sIgnore for java.net.Authenticator
+
+        // 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.
+       */
+      if (!Platform.isJS())
+      /* *
+       * java.net.Authenticator not implemented in SwingJS yet
+       * 
+       * @j2sIgnore
+       * 
+       */
+      {
+        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);
+  }
+
+  /**
+   * Getdown appbase methods
+   */
+
+  private static final String releaseAppbase;
+
+  private static String getdownAppbase;
+
+  private static String getdownDistDir;
+
+  static
+  {
+    if (!Platform.isJS())
+    {
+      Float specversion = Float
+              .parseFloat(System.getProperty("java.specification.version"));
+      releaseAppbase = (specversion < 9)
+              ? "https://www.jalview.org/getdown/release/1.8"
+              : "https://www.jalview.org/getdown/release/11";
+    }
+    else
+    {
+      // this value currenly made up, can be changed to URL that will be
+      // "https://www.jalview.org/jalview-js/swingjs/j2s/build_properties"
+      releaseAppbase = "https://www.jalview.org/jalview-js";
+      getdownAppbase = releaseAppbase;
+      getdownDistDir = "/swingjs/j2s";
+    }
+  }
+
+  // look for properties (passed in by getdown) otherwise default to release
+  private static void setGetdownAppbase()
+  {
+    if (getdownAppbase != null)
+    {
+      return;
+    }
+    String appbase = System.getProperty("getdownappbase");
+    String distDir = System.getProperty("getdowndistdir");
+    if (appbase == null)
+    {
+      appbase = buildProperties.getProperty("GETDOWNAPPBASE");
+      distDir = buildProperties.getProperty("GETDOWNAPPDISTDIR");
+    }
+    if (appbase == null)
+    {
+      appbase = releaseAppbase;
+      distDir = "release";
+    }
+    if (appbase.endsWith("/"))
+    {
+      appbase = appbase.substring(0, appbase.length() - 1);
+    }
+    if (distDir == null)
+    {
+      distDir = appbase.equals(releaseAppbase) ? "release" : "alt";
+    }
+    getdownAppbase = appbase;
+    getdownDistDir = distDir;
+  }
+
+  public static String getGetdownAppbase()
+  {
+    setGetdownAppbase();
+    return getdownAppbase;
+  }
+
+  public static String getAppbaseBuildProperties()
+  {
+    String appbase = getGetdownAppbase();
+    return appbase + "/" + getdownDistDir + "/build_properties";
+  }
 }