I2PControl: make it possible to access logs via the json-rpc interface

apps/i2pcontrol/java/net/i2p/i2pcontrol/servlets/JSONRPC2Servlet.java

@@ -112,6 +112,7 @@ public class JSONRPC2Servlet extends HttpServlet {
         disp.register(new RouterManagerHandler(_context, _helper));
         disp.register(new I2PControlHandler(_context, _helper, _secMan));
         disp.register(new AdvancedSettingsHandler(_context, _helper));
+        disp.register(new LogHandler(_context, _helper));
         if (_isWebapp) {
             PortMapper pm = _context.portMapper();
             int port = pm.getPort(PortMapper.SVC_CONSOLE);

apps/i2pcontrol/java/net/i2p/i2pcontrol/servlets/jsonrpc2handlers/LogHandler.java

@@ -0,0 +1,64 @@
+package net.i2p.i2pcontrol.servlets.jsonrpc2handlers;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.thetransactioncompany.jsonrpc2.JSONRPC2Error;
+import com.thetransactioncompany.jsonrpc2.JSONRPC2Request;
+import com.thetransactioncompany.jsonrpc2.JSONRPC2Response;
+import com.thetransactioncompany.jsonrpc2.server.MessageContext;
+import com.thetransactioncompany.jsonrpc2.server.RequestHandler;
+
+import net.i2p.I2PAppContext;
+import net.i2p.router.RouterContext;
+import net.i2p.util.Log;
+import net.i2p.util.LogManager;
+
+public class LogHandler implements RequestHandler {
+    private final RouterContext _context;
+    private final Log _log;
+    private static final String[] requiredArgs = { "Info" };
+    private final JSONRPC2Helper _helper;
+
+    public LogHandler(RouterContext ctx, JSONRPC2Helper helper) {
+        _helper = helper;
+        _context = ctx;
+        if (ctx != null)
+            _log = ctx.logManager().getLog(I2PControlHandler.class);
+        else
+            _log = I2PAppContext.getGlobalContext().logManager().getLog(I2PControlHandler.class);
+    }
+
+    // Reports the method names of the handled requests
+    public String[] handledRequests() {
+        return new String[] { "Info" };
+    }
+
+    // Processes the requests
+    public JSONRPC2Response process(JSONRPC2Request req, MessageContext ctx) {
+        if (req.getMethod().equals("Info")) {
+            JSONRPC2Error err = _helper.validateParams(requiredArgs, req);
+            if (err != null)
+                return new JSONRPC2Response(err, req.getID());
+
+            Map<String, Object> inParams = req.getNamedParams();
+            String selector = (String) inParams.get("Info");
+            Map<String, Object> outParams = new HashMap<String, Object>(4);
+            LogManager logManager = _context.logManager();
+            if (selector != null && !selector.isEmpty()) {
+                String echo = logManager.getLog(selector).toString();
+                outParams.put("Result", echo);
+                return new JSONRPC2Response(outParams, req.getID());
+            } else {
+                List<String> echoArray = logManager.getBuffer().getMostRecentMessages();
+                String echo = String.join("\n", echoArray);
+                outParams.put("Result", echo);
+                return new JSONRPC2Response(outParams, req.getID());
+            }
+        } else {
+            // Method name not supported
+            return new JSONRPC2Response(JSONRPC2Error.METHOD_NOT_FOUND, req.getID());
+        }
+    }
+}