Support for Mapbox fontstack API

src/util/mapbox.cpp

@@ -0,0 +1,44 @@
+#include <mbgl/util/mapbox.hpp>
+
+#include <stdexcept>
+
+namespace mbgl {
+namespace util {
+namespace mapbox {
+
+const std::string mapbox = "mapbox://";
+
+std::string normalizeURL(const std::string& url, const std::string& accessToken) {
+    if (accessToken.empty())
+        throw std::runtime_error("You must provide a Mapbox API access token for Mapbox tile sources");
+
+    return std::string("https://api.tiles.mapbox.com/v4/")
+        + url.substr(mapbox.length())
+        + "?access_token="
+        + accessToken;
+}
+
+std::string normalizeSourceURL(const std::string& url, const std::string& accessToken) {
+    if (url.compare(0, mapbox.length(), mapbox) != 0)
+        return url;
+
+    std::string result = normalizeURL(url + ".json", accessToken);
+
+    // TileJSON requests need a secure flag appended to their URLs so
+    // that the server knows to send SSL-ified resource references.
+    if (url.compare(0, 5, "https") == 0)
+        result += "&secure";
+
+    return result;
+}
+
+std::string normalizeGlyphsURL(const std::string& url, const std::string& accessToken) {
+    if (url.compare(0, mapbox.length(), mapbox) != 0)
+        return url;
+
+    return normalizeURL(url, accessToken);
+}
+
+}
+}
+}