Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #ifndef mozilla_dom_SRIMetadata_h
       8             : #define mozilla_dom_SRIMetadata_h
       9             : 
      10             : #include "nsTArray.h"
      11             : #include "nsString.h"
      12             : #include "SRICheck.h"
      13             : 
      14             : namespace mozilla {
      15             : namespace dom {
      16             : 
      17         343 : class SRIMetadata final
      18             : {
      19             :   friend class SRICheck;
      20             : 
      21             : public:
      22             :   static const uint32_t MAX_ALTERNATE_HASHES = 256;
      23             :   static const int8_t UNKNOWN_ALGORITHM = -1;
      24             : 
      25             :   /**
      26             :    * Create an empty metadata object.
      27             :    */
      28         172 :   SRIMetadata() : mAlgorithmType(UNKNOWN_ALGORITHM), mEmpty(true) {}
      29             : 
      30             :   /**
      31             :    * Split a string token into the components of an SRI metadata
      32             :    * attribute.
      33             :    */
      34             :   explicit SRIMetadata(const nsACString& aToken);
      35             : 
      36             :   /**
      37             :    * Returns true when this object's hash algorithm is weaker than the
      38             :    * other object's hash algorithm.
      39             :    */
      40             :   bool operator<(const SRIMetadata& aOther) const;
      41             : 
      42             :   /**
      43             :    * Not implemented. Should not be used.
      44             :    */
      45             :   bool operator>(const SRIMetadata& aOther) const;
      46             : 
      47             :   /**
      48             :    * Add another metadata's hash to this one.
      49             :    */
      50             :   SRIMetadata& operator+=(const SRIMetadata& aOther);
      51             : 
      52             :   /**
      53             :    * Returns true when the two metadata use the same hash algorithm.
      54             :    */
      55             :   bool operator==(const SRIMetadata& aOther) const;
      56             : 
      57          65 :   bool IsEmpty() const { return mEmpty; }
      58           0 :   bool IsMalformed() const { return mHashes.IsEmpty() || mAlgorithm.IsEmpty(); }
      59           0 :   bool IsAlgorithmSupported() const { return mAlgorithmType != UNKNOWN_ALGORITHM; }
      60           0 :   bool IsValid() const { return !IsMalformed() && IsAlgorithmSupported(); }
      61             : 
      62           0 :   uint32_t HashCount() const { return mHashes.Length(); }
      63             :   void GetHash(uint32_t aIndex, nsCString* outHash) const;
      64           0 :   void GetAlgorithm(nsCString* outAlg) const { *outAlg = mAlgorithm; }
      65             :   void GetHashType(int8_t* outType, uint32_t* outLength) const;
      66             : 
      67           2 :   const nsString& GetIntegrityString() const
      68             :   {
      69           2 :     return mIntegrityString;
      70             :   }
      71             : 
      72             : private:
      73             :   nsTArray<nsCString> mHashes;
      74             :   nsString mIntegrityString;
      75             :   nsCString mAlgorithm;
      76             :   int8_t mAlgorithmType;
      77             :   bool mEmpty;
      78             : };
      79             : 
      80             : } // namespace dom
      81             : } // namespace mozilla
      82             : 
      83             : #endif // mozilla_dom_SRIMetadata_h