[core] more robust max-age parsing

1 files changed, 29 insertions, 0 deletions

diff --git a/src/mbgl/util/http_header.cpp b/src/mbgl/util/http_header.cpp
new file mode 100644
index 0000000000..00aee151c8
--- /dev/null
+++ b/src/mbgl/util/http_header.cpp
@@ -0,0 +1,29 @@
+#include <mbgl/util/http_header.hpp>
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunknown-pragmas"
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#pragma GCC diagnostic ignored "-Wshadow"
+#include <boost/spirit/include/qi.hpp>
+#include <boost/spirit/include/phoenix_core.hpp>
+#include <boost/spirit/include/phoenix_operator.hpp>
+#pragma GCC diagnostic pop
+
+namespace mbgl {
+namespace http {
+
+CacheControl CacheControl::parse(const std::string& value) {
+    namespace qi = boost::spirit::qi;
+    namespace phoenix = boost::phoenix;
+
+    CacheControl result;
+    qi::phrase_parse(value.begin(), value.end(), (
+        (qi::lit("must-revalidate") [ phoenix::ref(result.mustRevalidate) = true ]) |
+        (qi::lit("max-age") >> '=' >> qi::ulong_long [ phoenix::ref(result.maxAge) = qi::_1 ]) |
+        (*(('"' >> *(('\\' >> qi::char_) | (qi::char_ - '"')) >> '"') | (qi::char_ - '"' - ',')))
+    ) % ',', qi::ascii::space);
+    return result;
+}
+
+} // namespace http
+} // namespace mbgl