Group ConnectToApplication-related info into a params struct.

mojo/shell/capability_filter.cc

 // Copyright 2015 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 "mojo/shell/capability_filter.h"
 
+#include "mojo/shell/identity.h"
+
 namespace mojo {
 namespace shell {
 
 CapabilityFilter GetPermissiveCapabilityFilter() {
   CapabilityFilter filter;
   AllowedInterfaces interfaces;
   interfaces.insert("*");
   filter["*"] = interfaces;
   return filter;
 }
 
+AllowedInterfaces GetAllowedInterfaces(const CapabilityFilter& filter,
+                                       const Identity& identity) {
+  // Start by looking for interfaces specific to the supplied identity.
+  auto it = filter.find(identity.url.spec());
+  if (it != filter.end())
+    return it->second;
+
+  // Fall back to looking for a wildcard rule.
+  it = filter.find("*");
+  if (filter.size() == 1 && it != filter.end())
+    return it->second;
+
+  // Finally, nothing is allowed.
+  return AllowedInterfaces();
+}
+
 }  // namespace shell
 }  // namespace mojo