SusDNS: Translate svg image text (ticket #1749)

apps/susidns/src/java/src/i2p/susi/dns/Messages.java

@@ -8,7 +8,7 @@ import net.i2p.util.Translate;
  * @since 0.7.9
  */
 public class Messages {
-    private static final String BUNDLE_NAME = "i2p.susi.dns.messages";
+    static final String BUNDLE_NAME = "i2p.susi.dns.messages";
     private final I2PAppContext _context;
 
     public Messages() {

apps/susidns/src/java/src/i2p/susi/dns/TranslateSVGServlet.java

@@ -0,0 +1,88 @@
+package i2p.susi.dns;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.PrintWriter;
+
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.ServletException;
+
+import net.i2p.CoreVersion;
+import net.i2p.I2PAppContext;
+import net.i2p.util.TranslateReader;
+ 
+/**
+ * Translate a svg file on-the-fly.
+ * svg file must contain strings tagged with _("...")
+ * See TranslateReader for details.
+ *
+ * We don't bother parsing the XML and replacing entities,
+ * since we had TranslateReader already.
+ * If we want to use svg files unmodified, we'll have to parse the XML
+ * and replace the title and tspan elements.
+ *
+ * Servlet path contains .svg files in the /svg/ directory.
+ *
+ * @since 0.9.34
+ */
+public class TranslateSVGServlet extends HttpServlet {
+ 
+    private static final long serialVersionUID = 18638760L;
+    private final I2PAppContext _context;
+    private final String DIR = "/svg";
+
+    public TranslateSVGServlet() {
+        super();
+        _context = I2PAppContext.getGlobalContext();
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        // this is the part after /images
+        String path = req.getPathInfo();
+        if (path == null || !path.endsWith(".svg")) {
+            resp.sendError(404);
+            return;
+        }
+        path = DIR + path;
+        InputStream in = getServletContext().getResourceAsStream(path);
+        if (in == null) {
+            resp.sendError(404);
+            return;
+        }
+        String etag = '"' + System.getProperty("router.version", CoreVersion.VERSION) + '"';
+        // This isn't working, the header is coming back null
+        String requestETag = req.getHeader("If-None-Match");
+        if (etag.equals(requestETag)) {
+            resp.setStatus(304);
+            resp.getOutputStream().close();
+            return;
+        }
+
+        resp.setCharacterEncoding("UTF-8");
+        resp.setHeader("X-Content-Type-Options", "nosniff");
+        resp.setHeader("Accept-Ranges", "none");
+        resp.setDateHeader("Expires", _context.clock().now() + 86400000L);
+        resp.setHeader("Cache-Control", "public, max-age=86400");
+        resp.setHeader("Pragma", "no-cache");
+        resp.setContentType("image/svg+xml");
+        resp.setHeader("ETag", etag);
+
+        PrintWriter out = resp.getWriter();
+        TranslateReader tr = null;
+        try {
+            tr = new TranslateReader(_context, Messages.BUNDLE_NAME, in);
+            char[] buf = new char[256];
+            int read;
+            while ((read = tr.read(buf)) != -1) {
+                out.write(buf, 0, read);
+            }   
+        } finally {
+            if (tr != null) try { tr.close(); } catch (IOException ioe) {}
+            try { in.close(); } catch (IOException ioe) {}
+            out.close();
+        }
+    }
+}