permissions: remove duplicates from request multiple at the Blink level

third_party/WebKit/Source/modules/permissions/Permissions.cpp

 // Copyright 2014 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 "config.h"
 #include "modules/permissions/Permissions.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/Nullable.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/modules/v8/V8MidiPermissionDescriptor.h"
 #include "bindings/modules/v8/V8PermissionDescriptor.h"
 #include "bindings/modules/v8/V8PushPermissionDescriptor.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/permissions/PermissionCallback.h"
 #include "modules/permissions/PermissionController.h"
 #include "modules/permissions/PermissionDescriptor.h"
 #include "modules/permissions/PermissionStatus.h"
 #include "modules/permissions/PermissionsCallback.h"
 #include "platform/Logging.h"
 #include "public/platform/Platform.h"
 #include "public/platform/modules/permissions/WebPermissionClient.h"
+#include "wtf/NotFound.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
 namespace {
 
 WebPermissionType getPermissionType(ScriptState* scriptState, const Dictionary& rawPermission, const PermissionDescriptor& permission, ExceptionState& exceptionState)
 {
     const String& name = permission.name();
     if (name == "geolocation")
         return WebPermissionTypeGeolocation;
@@ skipping 103 matching lines @@
     return promise;
 }
 
 ScriptPromise Permissions::request(ScriptState* scriptState, const Vector<Dictionary>& rawPermissions)
 {
     WebPermissionClient* client = getClient(scriptState->executionContext());
     if (!client)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(InvalidStateError, "In its current state, the global scope can't request permissions."));
 
     ExceptionState exceptionState(ExceptionState::GetterContext,  "request", "Permissions", scriptState->context()->Global(), scriptState->isolate());
-    OwnPtr<WebVector<WebPermissionType>> permissions = adoptPtr(new WebVector<WebPermissionType>(rawPermissions.size()));
+    OwnPtr<Vector<WebPermissionType>> internalPermissions = adoptPtr(new Vector<WebPermissionType>());
+    OwnPtr<Vector<int>> callerIndexToInternalIndex = adoptPtr(new Vector<int>(rawPermissions.size()));
     for (size_t i = 0; i < rawPermissions.size(); ++i) {
         const Dictionary& rawPermission = rawPermissions[i];
 
         Nullable<WebPermissionType> type = parsePermission(scriptState, rawPermission, exceptionState);
         if (exceptionState.hadException())
             return exceptionState.reject(scriptState);
 
-        permissions->operator[](i) = type.get();
+        // Only append permissions to the vector that is passed to the client if it is not already
+        // in the vector (i.e. do not duplicate permisison types).
+        int internalIndex;
+        auto it = internalPermissions->find(type.get());
+        if (it == kNotFound) {
+            internalIndex = internalPermissions->size();
+            internalPermissions->append(type.get());
+        } else {
+            internalIndex = it;
+        }
+        callerIndexToInternalIndex->operator[](i) = internalIndex;
     }
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
-    WebVector<WebPermissionType> permissionsCopy = *permissions;
-    client->requestPermissions(permissionsCopy, KURL(KURL(), scriptState->executionContext()->securityOrigin()->toString()), new PermissionsCallback(resolver, permissions.release()));
+    WebVector<WebPermissionType> internalWebPermissions = *internalPermissions;
+    client->requestPermissions(internalWebPermissions, KURL(KURL(), scriptState->executionContext()->securityOrigin()->toString()),
+        new PermissionsCallback(resolver, internalPermissions.release(), callerIndexToInternalIndex.release()));
     return promise;
 }
 
 ScriptPromise Permissions::revoke(ScriptState* scriptState, const Dictionary& rawPermission)
 {
     WebPermissionClient* client = getClient(scriptState->executionContext());
     if (!client)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(InvalidStateError, "In its current state, the global scope can't revoke permissions."));
 
     ExceptionState exceptionState(ExceptionState::GetterContext,  "revoke", "Permissions", scriptState->context()->Global(), scriptState->isolate());
     Nullable<WebPermissionType> type = parsePermission(scriptState, rawPermission, exceptionState);
     if (exceptionState.hadException())
         return exceptionState.reject(scriptState);
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
     client->revokePermission(type.get(), KURL(KURL(), scriptState->executionContext()->securityOrigin()->toString()), new PermissionCallback(resolver, type.get()));
     return promise;
 }
 
 } // namespace blink