1 files changed, 78 insertions, 0 deletions
diff --git a/dom/security/PolicyTokenizer.h b/dom/security/PolicyTokenizer.h
new file mode 100644
index 0000000000..1c3c18175d
--- /dev/null
+++ b/dom/security/PolicyTokenizer.h
@@ -0,0 +1,78 @@
+/* -*- 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 PolicyTokenizer_h___
+#define PolicyTokenizer_h___
+
+#include "nsContentUtils.h"
+#include "nsString.h"
+
+/**
+ * How does the parsing work?
+ *
+ * We generate tokens by splitting the policy-string by whitespace and
+ * semicolon. Interally the tokens are represented as an array of string-arrays:
+ *
+ *  [
+ *    [ name, src, src, src, ... ],
+ *    [ name, src, src, src, ... ],
+ *    [ name, src, src, src, ... ]
+ *  ]
+ *
+ * for example:
+ *  [
+ *    [ img-src, http://www.example.com, http:www.test.com ],
+ *    [ default-src, 'self'],
+ *    [ script-src, 'unsafe-eval', 'unsafe-inline' ],
+ *  ]
+ */
+
+using policyTokens = nsTArray<CopyableTArray<nsString>>;
+
+class PolicyTokenizer {
+ public:
+  static void tokenizePolicy(const nsAString& aPolicyString,
+                             policyTokens& outTokens);
+
+ private:
+  PolicyTokenizer(const char16_t* aStart, const char16_t* aEnd);
+  ~PolicyTokenizer();
+
+  inline bool atEnd() { return mCurChar >= mEndChar; }
+
+  inline void skipWhiteSpace() {
+    while (mCurChar < mEndChar && nsContentUtils::IsHTMLWhitespace(*mCurChar)) {
+      mCurChar++;
+    }
+    mCurToken.Truncate();
+  }
+
+  inline void skipWhiteSpaceAndSemicolon() {
+    while (mCurChar < mEndChar &&
+           (*mCurChar == ';' || nsContentUtils::IsHTMLWhitespace(*mCurChar))) {
+      mCurChar++;
+    }
+    mCurToken.Truncate();
+  }
+
+  inline bool accept(char16_t aChar) {
+    NS_ASSERTION(mCurChar < mEndChar, "Trying to dereference mEndChar");
+    if (*mCurChar == aChar) {
+      mCurToken.Append(*mCurChar++);
+      return true;
+    }
+    return false;
+  }
+
+  void generateNextToken();
+  void generateTokens(policyTokens& outTokens);
+
+  const char16_t* mCurChar;
+  const char16_t* mEndChar;
+  nsString mCurToken;
+};
+
+#endif /* PolicyTokenizer_h___ */