Implementation of beginning of Declarative Web Request API backend

chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h

Index: chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
diff --git a/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h b/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
new file mode 100644
index 0000000000000000000000000000000000000000..758aef590c3f20b7b304220891157e37bfcd8b38
--- /dev/null
+++ b/chrome/browser/extensions/api/declarative_webrequest/webrequest_condition_attribute.h
@@ -0,0 +1,103 @@
+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_
+#define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/scoped_ptr.h"
+#include "tools/json_schema_compiler/any.h"
+
+namespace base{
+class Value;
+}
+
+namespace net {
+class URLRequest;
+}
+
+namespace extensions {
+
+// Base class for all condition attributes of the declarative Web Request API
+// except for condition attribute to test URLPatterns.
+class WebRequestConditionAttribute {
+ public:
+  enum Type {
+    CONDITION_HAS_SCHEME
+  };
+
+  WebRequestConditionAttribute();
+  virtual ~WebRequestConditionAttribute();
+
+  // Factory method that creates a WebRequestConditionAttribute for the JSON
+  // dictionary {|name|: |value|} passed by the extension API. Sets |error| and
+  // returns NULL if something fails.
+  // The ownership of |value| remains at the caller.
+  static scoped_ptr<WebRequestConditionAttribute> Create(
+      const std::string& name,
+      const base::Value* value,
+      std::string* error);
+
+  // Returns a bit vector representing extensions::RequestStages. The bit vector
+  // contains a 1 for each request stage during which the condition attribute
+  // can be tested.
+  virtual int GetStages() const = 0;
+
+  // Returns whether the condition is fulfilled for this request.
+  virtual bool IsFulfilled(net::URLRequest* request) = 0;
+
+  virtual Type GetType() const = 0;
+
+  // Returns whether condition attributes of type |instance_type| are known
+  // and can be instantiated by Create().
+  static bool IsKnownType(const std::string& instance_type);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebRequestConditionAttribute);
+};
+
+typedef std::vector<linked_ptr<WebRequestConditionAttribute> >
+    WebRequestConditionAttributes;
+
+//
+// The following are concrete condition attributes.
+//
+
+// Condition that checks whether a URL has a specific scheme.
+// TODO(battre): Generalize this to allow checking for multiple schemes.
+// TODO(battre): Alternatively, move the scheme check into the URLMatcher.
+class WebRequestConditionAttributeHasScheme
+    : public WebRequestConditionAttribute {
+ public:
+  virtual ~WebRequestConditionAttributeHasScheme();
+
+  static bool IsMatchingType(const std::string& instance_type);
+
+  // Factory method, see WebRequestConditionAttribute::Create.
+  static scoped_ptr<WebRequestConditionAttribute> Create(
+      const std::string& name,
+      const base::Value* value,
+      std::string* error);
+
+  // Implementation of WebRequestConditionAttribute:
+  virtual int GetStages() const OVERRIDE;
+  virtual bool IsFulfilled(net::URLRequest* request) OVERRIDE;
+  virtual Type GetType() const OVERRIDE;
+
+ private:
+  explicit WebRequestConditionAttributeHasScheme(const std::string& pattern);
+
+  std::string pattern_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebRequestConditionAttributeHasScheme);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_WEBREQUEST_WEBREQUEST_CONDITION_ATTRIBUTE_H_