mimetypes: init module mimetypes

Makefile

@@ -1,7 +1,7 @@
 DC = ldc2
 CFLAGS = -Jstatic -Oz
 
-OBJS = httpd.o
+OBJS = httpd.o mimetypes.o
 
 all: httpd
 

mimetypes.d

@@ -0,0 +1,46 @@
+module mimetypes;
+
+import std.csv;
+import std.traits;
+
+string[string] mimeTypes;
+
+static this()
+{
+	mimeTypes = mimeMapping!("mimetypes.csv");
+}
+
+template mimeMapping(string csvFile, T = string[string])
+if (isAssociativeArray!T)
+{
+	enum mimeMapping = makeMimeMapping!(import(csvFile), T);
+}
+
+private T
+makeMimeMapping(string csv, T)()
+if (isAssociativeArray!T)
+{
+	T result;
+
+	foreach (record; csvReader!T(csv, null)) {
+		result[record["Extension"]] = record["Type"];
+	}
+
+	return result;
+}
+
+string
+mimeType(string fileName) @safe
+{
+	import std.path : extension;
+	import std.uni  : toLower;
+
+	string ext;
+
+	ext = fileName.extension();
+	if (!ext)
+		return "application/octet-stream";
+
+	ext = ext[1 .. $].toLower();
+	return mimeTypes[ext];
+}