Update examples with dh_params

examples/helpers/FileCache.h

@@ -0,0 +1,49 @@
+#include <experimental/filesystem>
+#include <map>
+#include <fstream>
+
+struct FileCache {
+private:
+    std::map<std::string_view, std::string_view> cache;
+
+    void cacheFile(std::string file, std::string root) {
+        std::cout << "Caching file: " << file << std::endl;
+
+        std::ifstream fin(root + file, std::ios::binary);
+        std::ostringstream oss;
+        oss << fin.rdbuf();
+
+        if (file == "/index.html") {
+            file = "/";
+        }
+
+        char *cachedFile = (char *) malloc(oss.str().size());
+        memcpy(cachedFile, oss.str().data(), oss.str().size());
+
+        char *key = (char *) malloc(file.length());
+        memcpy(key, file.data(), file.length());
+
+        std::cout << "Size: " << oss.str().size() << std::endl;
+
+        cache[std::string_view(key, file.length())] = std::string_view(cachedFile, oss.str().size());
+    }
+
+public:
+    FileCache(std::string root) {
+        for(auto &p : std::experimental::filesystem::recursive_directory_iterator(root)) {
+            cacheFile(p.path().string().substr(root.length()), root);
+        }
+    }
+
+    std::string_view getFile(std::string_view file) {
+        auto it = cache.find(file);
+
+        if (it == cache.end()) {
+//std::cout << "Did not find file: " << file << std::endl;
+            return "<h1>Nope!</h1>";
+        } else {
+//std::cout << "Did find file: " << file << std::endl;
+            return it->second;
+        }
+    }
+};

examples/helpers/Middleware.h

@@ -0,0 +1,19 @@
+/* Middleware to fill out content-type */
+inline bool hasExt(std::string_view file, std::string_view ext) {
+    if (ext.size() > file.size()) {
+        return false;
+    }
+    return std::equal(ext.rbegin(), ext.rend(), file.rbegin());
+}
+
+/* This should be a filter / middleware like app.use(handler) */
+template <bool SSL>
+uWS::HttpResponse<SSL> *serveFile(uWS::HttpResponse<SSL> *res, uWS::HttpRequest *req) {
+    res->writeStatus(uWS::HTTP_200_OK);
+
+    if (hasExt(req->getUrl(), ".svg")) {
+        res->writeHeader("Content-Type", "image/svg+xml");
+    }
+
+    return res;
+}