Emit an error log line when attempting to connect to an app at an invalid URL.

mojo/shell/desktop/mojo_main.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <iostream>
 
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 25 matching lines @@
 GURL GetAppURLAndSetArgs(const std::string& app_url_and_args,
                          mojo::shell::Context* context) {
   // SplitString() returns empty strings for extra delimeter characters (' ').
   std::vector<std::string> argv;
   base::SplitString(app_url_and_args, ' ', &argv);
   argv.erase(std::remove_if(argv.begin(), argv.end(), IsEmpty), argv.end());
 
   if (argv.empty())
     return GURL::EmptyGURL();
   GURL app_url(argv[0]);
+  if (!app_url.is_valid()) {
+    LOG(ERROR) << "Error: invalid URL: " << argv[0];
+    return app_url;
+  }
   if (argv.size() > 1)
     context->application_manager()->SetArgsForURL(argv, app_url);
   return app_url;
 }
 
 void RunApps(mojo::shell::Context* context) {
   const auto& command_line = *base::CommandLine::ForCurrentProcess();
   for (const auto& arg : command_line.GetArgs()) {
     std::string arg2;
 #if defined(OS_WIN)
     arg2 = base::UTF16ToUTF8(arg);
 #else
     arg2 = arg;
 #endif
+    GURL url = GetAppURLAndSetArgs(arg2, context);
+    if (!url.is_valid())
+      return;
     context->Run(GetAppURLAndSetArgs(arg2, context));
   }
 }
 
 void Usage() {
   std::cerr << "Launch Mojo applications.\n";
   std::cerr
       << "Usage: mojo_shell"
       << " [--" << switches::kArgsFor << "=<mojo-app>]"
       << " [--" << switches::kContentHandlers << "=<handlers>]"
@@ skipping 87 matching lines @@
         if (IsArgsFor(argv[i], &args_for_value))
           GetAppURLAndSetArgs(args_for_value, &shell_context);
       }
 
       message_loop.PostTask(FROM_HERE, base::Bind(RunApps, &shell_context));
       message_loop.Run();
     }
   }
   return 0;
 }