Group ConnectToApplication-related info into a params struct.

mojo/shell/capability_filter.cc

Index: mojo/shell/capability_filter.cc
diff --git a/mojo/shell/capability_filter.cc b/mojo/shell/capability_filter.cc
index fa39449c50aac95d666c885338cf899f73a9c8ef..be595e0a827702f89f669e1d79c9b51cd5d733a9 100644
--- a/mojo/shell/capability_filter.cc
+++ b/mojo/shell/capability_filter.cc
@@ -4,6 +4,8 @@
 
 #include "mojo/shell/capability_filter.h"
 
+#include "mojo/shell/identity.h"
+
 namespace mojo {
 namespace shell {
 
@@ -15,5 +17,21 @@ CapabilityFilter GetPermissiveCapabilityFilter() {
   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