Add static file type detection

src/static_file.cpp

@@ -1 +1,35 @@
 #include "static_file.h"
+
+string file_type(string filename) {
+  string ext = split_at(filename, '.').back();
+
+  if (ext == "css") {
+    return "text/css";
+  }
+
+  if (ext == "csv") {
+    return "text/csv";
+  }
+
+  if (ext == "html" || ext == "htm") {
+    return "text/html";
+  }
+
+  if (ext == "ico") {
+    return "image/vnd.microsoft.icon";
+  }
+
+  if (ext == "js") {
+    return "text/javascript";
+  }
+
+  if (ext == "json") {
+    return "application/json";
+  }
+
+  if (ext == "xhtml") {
+    return "application/xhtml+xml";
+  }
+
+  return "text/plain";
+}

src/static_file.h

@@ -6,6 +6,9 @@
 #include "middleware.h"
 #include "route.h"
 #include "router.h"
+#include "utils.h"
+
+string file_type(string filename);
 
 class StaticFile : public Route {
 private:
@@ -16,9 +19,15 @@ class StaticFile : public Route {
 public:
   UriArgs uri_args;
 
-  StaticFile(string filename, string path, string content_type = "text/plain")
+  StaticFile(string filename, string path,
+             string content_type)
       : filename(filename), path(path), content_type(content_type) {}
 
+  StaticFile(string filename, string path)
+      : filename(filename), path(path) {
+        content_type = file_type(filename);
+      }
+
   Outcome middlewares() {
     return MiddleWares<StaticFile>()
         .add(new Router<StaticFile>(HTTP_GET_METHOD, {path + filename}))