Implementation of ONC signature, validator and normalizer.

chrome/browser/chromeos/network_settings/onc_validator.h

+// 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_CHROMEOS_NETWORK_SETTINGS_ONC_VALIDATOR_H_
+#define CHROME_BROWSER_CHROMEOS_NETWORK_SETTINGS_ONC_VALIDATOR_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/chromeos/network_settings/onc_mapper.h"
+
+namespace base {
+class Value;
+class DictionaryValue;
+}
+
+namespace chromeos {
+namespace onc {
+
+class OncValueSignature;
+
+class Validator : public Mapper {
+ public:
+  // Creates a Validator with the following options:
+  // - It is an error if |error_on_unknown_field| is true and a field name is
+  // found that is not part of the signature.
+  // - It is an error if |error_on_wrong_recommended| is true and a kRecommended
+  // array contains a field name that is not part of the enclosing object's
+  // signature.
+  // - It is an error if |error_on_missing_field| is true and a required field
+  // is missing.
+  // - It is an error if |managed_onc| is false and a kRecommended field is set.
+  // Any error stops the validation. Only if no error occurs, a repaired object
+  // is created that contains all but the problematic fields and values.
+  Validator(bool error_on_unknown_field,
+            bool error_on_wrong_recommended,
+            bool error_on_missing_field,
+            bool managed_onc);
+
+  // Shortcut to create a strict validator: every error option is true.
+  static scoped_ptr<Validator> CreateStrictValidator(bool managed_onc);
+  // Shortcut to create a liberal validator: every error option is false.
+  static scoped_ptr<Validator> CreateLiberalValidator(bool managed_onc);
+
+  // Validate and repair the given |onc_object| according to
+  // |object_signature|. The |object_signature| has to be a pointer to one of
+  // the signatures in |onc_signature.h|. If repair is possible (no error
+  // encountered), returns the repaired object, otherwise returns NULL.
+  scoped_ptr<base::DictionaryValue> ValidateAndRepairObject(
+      const OncValueSignature* object_signature,
+      const base::DictionaryValue& onc_object);
+
+ private:
+  // Compare |onc_value|s type with |onc_type| and validate/repair according to
+  // |value_signature|. On error returns NULL.
+  virtual scoped_ptr<base::Value> MapValue(
+    const OncValueSignature& signature,
+    const base::Value& onc_value);
+
+  // Dispatch to the right validation function according to
+  // |signature|. Iterates over all fields and recursively validates/repairs
+  // these. All valid fields are added to the result dictionary. Returns the
+  // repaired dictionary. On error returns NULL.
+  virtual scoped_ptr<base::DictionaryValue> MapObject(
+      const OncValueSignature& signature,
+      const base::DictionaryValue& onc_object);
+
+  // This is the default validation of objects/dictionaries. Validates
+  // |onc_object| according to |object_signature|. |result| must point to a
+  // dictionary into which the repaired fields are written.
+  bool ValidateObjectDefault(
+      const OncValueSignature& object_signature,
+      const base::DictionaryValue& onc_object,
+      base::DictionaryValue* result);
+
+  // Validates/repairs the kRecommended array in |result| according to
+  // |object_signature| of the enclosing object.
+  bool ValidateRecommendedField(
+      const OncValueSignature& object_signature,
+      base::DictionaryValue* result);
+
+  bool ValidateNetworkConfiguration(
+      const base::DictionaryValue& onc_object,
+      base::DictionaryValue* result);
+
+  bool ValidateVpn(
+      const base::DictionaryValue& onc_object,
+      base::DictionaryValue* result);
+
+  bool ValidateIpsec(
+      const base::DictionaryValue& onc_object,
+      base::DictionaryValue* result);
+
+  const bool error_on_unknown_field_;
+  const bool error_on_wrong_recommended_;
+  const bool error_on_missing_field_;
+  const bool managed_onc_;
+
+  DISALLOW_COPY_AND_ASSIGN(Validator);
+};
+
+}  // namespace onc
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_NETWORK_SETTINGS_ONC_VALIDATOR_H_