[webcrypto] Set the error type for failures.

content/child/webcrypto/status.h

 // 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.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 #define CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 
 #include <string>
 #include "content/common/content_export.h"
+#include "third_party/WebKit/public/platform/WebCrypto.h"
+
+#if !defined(WEBCRYPTO_HAS_ERROR_TYPE)
+
+// TODO(eroman): Delete once Blink changes have rolled into Chromium.
+namespace blink {
+
+enum WebCryptoErrorType {
+  WebCryptoErrorTypeType,
+  WebCryptoErrorTypeNotSupported,
+  WebCryptoErrorTypeSyntax,
+  WebCryptoErrorTypeInvalidState,
+  WebCryptoErrorTypeInvalidAccess,
+  WebCryptoErrorTypeUnknown,
+  WebCryptoErrorTypeData,
+  WebCryptoErrorTypeOperation,
+};
+
+}  // namespace blink
+
+#endif
 
 namespace content {
 
 namespace webcrypto {
 
 // Status indicates whether an operation completed successfully, or with an
 // error. The error is used for verification in unit-tests, as well as for
 // display to the user.
 //
 // As such, it is important that errors DO NOT reveal any sensitive material
 // (like key bytes).
 //
 // Care must be taken with what errors are reported back to blink when doing
 // compound operations like unwrapping a JWK key. In this case, errors
 // generated by the JWK import are not appropriate to report since the wrapped
 // JWK is not visible to the caller.
 class CONTENT_EXPORT Status {
  public:
   // Returns true if the Status represents an error (any one of them).
   bool IsError() const;
 
   // Returns true if the Status represent success.
   bool IsSuccess() const;
 
-  // Returns true if the Status contains a non-empty error message.
-  bool HasErrorDetails() const;
+  // Returns a UTF-8 error message (non-localized) describing the error.
+  const std::string& error_details() const { return error_details_; }
 
-  // Returns a UTF-8 error message (non-localized) describing the error. This
-  // message is intended to be displayed in the dev tools console.
-  std::string ToString() const;
+  blink::WebCryptoErrorType error_type() const { return error_type_; }
 
   // Constructs a status representing success.
   static Status Success();
 
-  // Constructs a status representing a generic error. It contains no extra
-  // details.
-  static Status Error();
+  // Constructs a status representing a generic operation error. It contains no
+  // extra details.
+  static Status OperationError();
+
+  // Constructs a status representing a generic data error. It contains no
+  // extra details.
+  static Status DataError();
 
   // ------------------------------------
   // Errors when importing a JWK formatted key
   // ------------------------------------
 
   // The key bytes could not parsed as JSON dictionary. This either
   // means there was a parsing error, or the JSON object was not
   // convertable to a dictionary.
   static Status ErrorJwkNotDictionary();
 
@@ skipping 55 matching lines @@
 
   // ------------------------------------
   // Other errors
   // ------------------------------------
 
   // No key data was provided when importing an spki, pkcs8, or jwk formatted
   // key. This does not apply to raw format, since it is possible to have empty
   // key data there.
   static Status ErrorImportEmptyKeyData();
 
+  // The key data buffer provided for importKey() is an incorrect length for
+  // AES.
+  static Status ErrorImportAesKeyLength();
+
   // The wrong key was used for the operation. For instance, a public key was
   // used to verify a RsaSsaPkcs1v1_5 signature, or tried exporting a private
   // key using spki format.
   static Status ErrorUnexpectedKeyType();
 
   // When doing an AES-CBC encryption/decryption, the "iv" parameter was not 16
   // bytes.
   static Status ErrorIncorrectSizeAesCbcIv();
 
   // The data provided to an encrypt/decrypt/sign/verify operation was too
@@ skipping 43 matching lines @@
   // An unextractable key was used by an operation which exports the key data.
   static Status ErrorKeyNotExtractable();
 
   // The key length specified when generating a key was invalid. Either it was
   // zero, or it was not a multiple of 8 bits.
   static Status ErrorGenerateKeyLength();
 
  private:
   enum Type { TYPE_ERROR, TYPE_SUCCESS };
 
-  // Constructs an error with the specified message.
-  explicit Status(const std::string& error_details_utf8);
+  // Constructs an error with the specified error type and message.
+  Status(blink::WebCryptoErrorType error_type,
+         const std::string& error_details_utf8);
 
   // Constructs a success or error without any details.
   explicit Status(Type type);
 
   Type type_;
+  blink::WebCryptoErrorType error_type_;
   std::string error_details_;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_STATUS_H_