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-rw-r--r--dom/security/SRIMetadata.h83
1 files changed, 83 insertions, 0 deletions
diff --git a/dom/security/SRIMetadata.h b/dom/security/SRIMetadata.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_SRIMetadata_h
+#define mozilla_dom_SRIMetadata_h
+
+#include "nsTArray.h"
+#include "nsString.h"
+#include "SRICheck.h"
+
+namespace mozilla {
+namespace dom {
+
+class SRIMetadata final
+{
+ friend class SRICheck;
+
+public:
+ static const uint32_t MAX_ALTERNATE_HASHES = 256;
+ static const int8_t UNKNOWN_ALGORITHM = -1;
+
+ /**
+ * Create an empty metadata object.
+ */
+ SRIMetadata() : mAlgorithmType(UNKNOWN_ALGORITHM), mEmpty(true) {}
+
+ /**
+ * Split a string token into the components of an SRI metadata
+ * attribute.
+ */
+ explicit SRIMetadata(const nsACString& aToken);
+
+ /**
+ * Returns true when this object's hash algorithm is weaker than the
+ * other object's hash algorithm.
+ */
+ bool operator<(const SRIMetadata& aOther) const;
+
+ /**
+ * Not implemented. Should not be used.
+ */
+ bool operator>(const SRIMetadata& aOther) const;
+
+ /**
+ * Add another metadata's hash to this one.
+ */
+ SRIMetadata& operator+=(const SRIMetadata& aOther);
+
+ /**
+ * Returns true when the two metadata use the same hash algorithm.
+ */
+ bool operator==(const SRIMetadata& aOther) const;
+
+ bool IsEmpty() const { return mEmpty; }
+ bool IsMalformed() const { return mHashes.IsEmpty() || mAlgorithm.IsEmpty(); }
+ bool IsAlgorithmSupported() const { return mAlgorithmType != UNKNOWN_ALGORITHM; }
+ bool IsValid() const { return !IsMalformed() && IsAlgorithmSupported(); }
+
+ uint32_t HashCount() const { return mHashes.Length(); }
+ void GetHash(uint32_t aIndex, nsCString* outHash) const;
+ void GetAlgorithm(nsCString* outAlg) const { *outAlg = mAlgorithm; }
+ void GetHashType(int8_t* outType, uint32_t* outLength) const;
+
+ const nsString& GetIntegrityString() const
+ {
+ return mIntegrityString;
+ }
+
+private:
+ nsTArray<nsCString> mHashes;
+ nsString mIntegrityString;
+ nsCString mAlgorithm;
+ int8_t mAlgorithmType;
+ bool mEmpty;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // mozilla_dom_SRIMetadata_h