1 files changed, 107 insertions, 0 deletions
diff --git a/subsonic-main/src/main/java/net/sourceforge/subsonic/filter/BootstrapVerificationFilter.java b/subsonic-main/src/main/java/net/sourceforge/subsonic/filter/BootstrapVerificationFilter.java
new file mode 100644
index 00000000..c93d0603
--- /dev/null
+++ b/subsonic-main/src/main/java/net/sourceforge/subsonic/filter/BootstrapVerificationFilter.java
@@ -0,0 +1,107 @@
+/*
+ This file is part of Subsonic.
+
+ Subsonic is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Subsonic 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 for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Subsonic.  If not, see <http://www.gnu.org/licenses/>.
+
+ Copyright 2009 (C) Sindre Mehus
+ */
+package net.sourceforge.subsonic.filter;
+
+import net.sourceforge.subsonic.service.SettingsService;
+
+import javax.servlet.Filter;
+import javax.servlet.FilterChain;
+import javax.servlet.FilterConfig;
+import javax.servlet.ServletException;
+import javax.servlet.ServletOutputStream;
+import javax.servlet.ServletRequest;
+import javax.servlet.ServletResponse;
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * This filter is executed very early in the filter chain. It verifies that
+ * the Subsonic home directory (c:\subsonic or /var/subsonic) exists and
+ * is writable. If not, a proper error message is given to the user.
+ * <p/>
+ * (The Subsonic home directory is usually created automatically, but a common
+ * problem on Linux is that the Tomcat user does not have the necessary
+ * privileges).
+ *
+ * @author Sindre Mehus
+ */
+public class BootstrapVerificationFilter implements Filter {
+
+    private boolean subsonicHomeVerified = false;
+
+
+    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
+            throws IOException, ServletException {
+
+        // Already verified?
+        if (subsonicHomeVerified) {
+            chain.doFilter(req, res);
+            return;
+        }
+
+        File home = SettingsService.getSubsonicHome();
+        if (!directoryExists(home)) {
+            error(res, "<p>The directory <b>" + home + "</b> does not exist. Please create it and make it writable, " +
+                       "then restart the servlet container.</p>" +
+                       "<p>(You can override the directory location by specifying -Dsubsonic.home=... when " +
+                       "starting the servlet container.)</p>");
+
+        } else if (!directoryWritable(home)) {
+            error(res, "<p>The directory <b>" + home + "</b> is not writable. Please change file permissions, " +
+                       "then restart the servlet container.</p>" +
+                       "<p>(You can override the directory location by specifying -Dsubsonic.home=... when " +
+                       "starting the servlet container.)</p>");
+
+        } else {
+            subsonicHomeVerified = true;
+            chain.doFilter(req, res);
+        }
+    }
+
+    private boolean directoryExists(File dir) {
+        return dir.exists() && dir.isDirectory();
+    }
+
+    private boolean directoryWritable(File dir) {
+        try {
+            File tempFile = File.createTempFile("test", null, dir);
+            tempFile.delete();
+            return true;
+        } catch (IOException x) {
+            return false;
+        }
+    }
+
+    private void error(ServletResponse res, String error) throws IOException {
+        ServletOutputStream out = res.getOutputStream();
+        out.println("<html>" +
+                    "<head><title>Subsonic Error</title></head>" +
+                    "<body>" +
+                    "<h2>Subsonic Error</h2>" +
+                    error +
+                    "</body>" +
+                    "</html>");
+    }
+
+    public void init(FilterConfig filterConfig) {
+    }
+
+    public void destroy() {
+    }
+}