Fix #6565 Deploy Symlinked applications (#6567)

Fix #6565 Deploy Symlinked applications by treating extracting context name (which becomes the default context path) from the base resource and then following aliases, so that base resource will not be an alias.   Added warning in ContextHandler if the base resource is an alias that we may not support this in future releases.

Signed-off-by: Greg Wilkins <gregw@webtide.com>

jetty-deploy/src/main/java/org/eclipse/jetty/deploy/providers/WebAppProvider.java

@@ -22,6 +22,7 @@ import org.eclipse.jetty.deploy.ConfigurationManager;
 import org.eclipse.jetty.deploy.util.FileID;
 import org.eclipse.jetty.server.Server;
 import org.eclipse.jetty.server.handler.ContextHandler;
+import org.eclipse.jetty.util.StringUtil;
 import org.eclipse.jetty.util.URIUtil;
 import org.eclipse.jetty.util.annotation.ManagedAttribute;
 import org.eclipse.jetty.util.annotation.ManagedObject;
@@ -265,8 +266,18 @@ public class WebAppProvider extends ScanningAppProvider
         if (!resource.exists())
             throw new IllegalStateException("App resource does not exist " + resource);
 
-        String context = file.getName();
+        final String contextName = file.getName();
 
+        // Resource aliases (after getting name) to ensure baseResource is not an alias
+        if (resource.isAlias())
+        {
+            file = new File(resource.getAlias()).toPath().toRealPath().toFile();
+            resource = Resource.newResource(file);
+            if (!resource.exists())
+                throw new IllegalStateException("App resource does not exist " + resource);
+        }
+
+        // Handle a context XML file
         if (resource.exists() && FileID.isXmlFile(file))
         {
             XmlConfiguration xmlc = new XmlConfiguration(resource)
@@ -276,11 +287,15 @@ public class WebAppProvider extends ScanningAppProvider
                 {
                     super.initializeDefaults(context);
 
+                    // If the XML created object is a ContextHandler
+                    if (context instanceof ContextHandler)
+                        // Initialize the context path prior to running context XML
+                        initializeContextPath((ContextHandler)context, contextName, true);
+
+                    // If it is a webapp
                     if (context instanceof WebAppContext)
-                    {
-                        WebAppContext webapp = (WebAppContext)context;
-                        initializeWebAppContextDefaults(webapp);
-                    }
+                        // initialize other defaults prior to running context XML
+                        initializeWebAppContextDefaults((WebAppContext)context);
                 }
             };
 
@@ -290,56 +305,64 @@ public class WebAppProvider extends ScanningAppProvider
                 xmlc.getProperties().putAll(getConfigurationManager().getProperties());
             return (ContextHandler)xmlc.configure();
         }
-        else if (file.isDirectory())
-        {
-            // must be a directory
-        }
-        else if (FileID.isWebArchiveFile(file))
-        {
-            // Context Path is the same as the archive.
-            context = context.substring(0, context.length() - 4);
-        }
-        else
+        // Otherwise it must be a directory or an archive
+        else if (!file.isDirectory() && !FileID.isWebArchiveFile(file))
         {
             throw new IllegalStateException("unable to create ContextHandler for " + app);
         }
 
-        // Ensure "/" is Not Trailing in context paths.
-        if (context.endsWith("/") && context.length() > 0)
-        {
-            context = context.substring(0, context.length() - 1);
-        }
-
-        // Start building the webapplication
+        // Build the web application
         WebAppContext webAppContext = new WebAppContext();
-        webAppContext.setDisplayName(context);
-
-        // special case of archive (or dir) named "root" is / context
-        if (context.equalsIgnoreCase("root"))
-        {
-            context = URIUtil.SLASH;
-        }
-        else if (context.toLowerCase(Locale.ENGLISH).startsWith("root-"))
-        {
-            int dash = context.toLowerCase(Locale.ENGLISH).indexOf('-');
-            String virtual = context.substring(dash + 1);
-            webAppContext.setVirtualHosts(new String[]{virtual});
-            context = URIUtil.SLASH;
-        }
-
-        // Ensure "/" is Prepended to all context paths.
-        if (context.charAt(0) != '/')
-        {
-            context = "/" + context;
-        }
-
-        webAppContext.setDefaultContextPath(context);
         webAppContext.setWar(file.getAbsolutePath());
+        initializeContextPath(webAppContext, contextName, !file.isDirectory());
         initializeWebAppContextDefaults(webAppContext);
 
         return webAppContext;
     }
 
+    protected void initializeContextPath(ContextHandler context, String contextName, boolean stripExtension)
+    {
+        String contextPath = contextName;
+
+        // Strip any 3 char extension from non directories
+        if (stripExtension && contextPath.length() > 4 && contextPath.charAt(contextPath.length() - 4) == '.')
+            contextPath = contextPath.substring(0, contextPath.length() - 4);
+
+        // Ensure "/" is Not Trailing in context paths.
+        if (contextPath.endsWith("/") && contextPath.length() > 1)
+            contextPath = contextPath.substring(0, contextPath.length() - 1);
+
+        // special case of archive (or dir) named "root" is / context
+        if (contextPath.equalsIgnoreCase("root"))
+        {
+            contextPath = URIUtil.SLASH;
+        }
+        // handle root with virtual host form
+        else if (StringUtil.startsWithIgnoreCase(contextPath, "root-"))
+        {
+            int dash = contextPath.indexOf('-');
+            String virtual = contextPath.substring(dash + 1);
+            context.setVirtualHosts(virtual.split(","));
+            contextPath = URIUtil.SLASH;
+        }
+
+        // Ensure "/" is Prepended to all context paths.
+        if (contextPath.charAt(0) != '/')
+            contextPath = "/" + contextPath;
+
+        // Set the display name and context Path
+        context.setDisplayName(contextName);
+        if (context instanceof WebAppContext)
+        {
+            WebAppContext webAppContext = (WebAppContext)context;
+            webAppContext.setDefaultContextPath(contextPath);
+        }
+        else
+        {
+            context.setContextPath(contextPath);
+        }
+    }
+
     @Override
     protected void fileChanged(String filename) throws Exception
     {

jetty-deploy/src/test/java/org/eclipse/jetty/deploy/providers/WebAppProviderTest.java

@@ -25,6 +25,7 @@ import java.util.Map;
 import org.eclipse.jetty.deploy.test.XmlConfiguredJetty;
 import org.eclipse.jetty.server.Handler;
 import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.handler.ContextHandler;
 import org.eclipse.jetty.server.handler.HandlerCollection;
 import org.eclipse.jetty.toolchain.test.MavenTestingUtils;
 import org.eclipse.jetty.toolchain.test.jupiter.WorkDir;
@@ -124,9 +125,12 @@ public class WebAppProviderTest
         // Check Server for expected Handlers
         jetty.assertWebAppContextsExists("/bar", "/foo", "/bob");
 
+        // Check that baseResources are not aliases
+        jetty.getServer().getContainedBeans(ContextHandler.class).forEach(h -> assertFalse(h.getBaseResource().isAlias()));
+
         // Test for expected work/temp directory behaviour
         File workDir = jetty.getJettyDir("workish");
-        assertTrue(hasJettyGeneratedPath(workDir, "bar_war"), "Should have generated directory in work directory: " + workDir);
+        assertTrue(hasJettyGeneratedPath(workDir, "_war-_bar"), "Should have generated directory in work directory: " + workDir);
     }
     
     @Test

jetty-server/src/main/java/org/eclipse/jetty/server/handler/ContextHandler.java

@@ -853,11 +853,15 @@ public class ContextHandler extends ScopedHandler implements Attributes, Gracefu
     @Override
     protected void doStart() throws Exception
     {
-        _availability.set(Availability.STARTING);
-
         if (_contextPath == null)
             throw new IllegalStateException("Null contextPath");
 
+        if (getBaseResource() != null && getBaseResource().isAlias())
+            LOG.warn("BaseResource {} is aliased to {} in {}. May not be supported in future releases.",
+                getBaseResource(), getBaseResource().getAlias(), this);
+
+        _availability.set(Availability.STARTING);
+
         if (_logger == null)
             _logger = LoggerFactory.getLogger(ContextHandler.class.getName() + getLogNameSuffix());