Add very simple markdown middleware for now

cmd/caddy2/main.go

@@ -8,6 +8,8 @@ import (
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/caddylog"
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/fileserver"
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/headers"
+	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/markdown"
+	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/requestbody"
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/reverseproxy"
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp/rewrite"
 	_ "bitbucket.org/lightcodelabs/caddy2/modules/caddytls"

modules/caddyhttp/markdown/markdown.go

@@ -0,0 +1,53 @@
+package markdown
+
+import (
+	"net/http"
+	"strconv"
+
+	"gopkg.in/russross/blackfriday.v2"
+
+	"bitbucket.org/lightcodelabs/caddy2"
+	"bitbucket.org/lightcodelabs/caddy2/modules/caddyhttp"
+)
+
+func init() {
+	caddy2.RegisterModule(caddy2.Module{
+		Name: "http.middleware.markdown",
+		New:  func() interface{} { return new(Markdown) },
+	})
+}
+
+// Markdown is a middleware for rendering a Markdown response body.
+type Markdown struct {
+}
+
+func (m Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
+	mrw := &markdownResponseWriter{
+		ResponseWriterWrapper: &caddyhttp.ResponseWriterWrapper{ResponseWriter: w},
+	}
+	return next.ServeHTTP(mrw, r)
+}
+
+type markdownResponseWriter struct {
+	*caddyhttp.ResponseWriterWrapper
+	statusCode  int
+	wroteHeader bool
+}
+
+func (mrw *markdownResponseWriter) WriteHeader(code int) {
+	mrw.statusCode = code
+}
+
+func (mrw *markdownResponseWriter) Write(d []byte) (int, error) {
+	output := blackfriday.Run(d)
+	if !mrw.wroteHeader {
+		mrw.Header().Set("Content-Length", strconv.Itoa(len(output)))
+		mrw.Header().Set("Content-Type", "text/html; charset=utf-8")
+		mrw.WriteHeader(mrw.statusCode)
+		mrw.wroteHeader = true
+	}
+	return mrw.ResponseWriter.Write(output)
+}
+
+// Interface guard
+var _ caddyhttp.MiddlewareHandler = (*Markdown)(nil)