Better search for config.

Handle LastModifiedHeader better.
Handle HEAD/GET.

middleware/markdown/markdown.go

@@ -8,6 +8,7 @@ import (
 	"os"
 	"path"
 	"text/template"
+	"time"
 
 	"github.com/mholt/caddy/middleware"
 	"github.com/russross/blackfriday"
@@ -65,26 +66,47 @@ type Config struct {
 
 // ServeHTTP implements the http.Handler interface.
 func (md Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
-	for _, cfg := range md.Configs {
-		if !middleware.Path(r.URL.Path).Matches(cfg.PathScope) {
-			continue
+	var cfg *Config
+	for _, c := range md.Configs {
+		if middleware.Path(r.URL.Path).Matches(c.PathScope) { // not negated
+			cfg = c
+			break // or goto
+		}
+	}
+	if cfg == nil {
+		return md.Next.ServeHTTP(w, r) // exit early
+	}
+
+	// We only deal with HEAD/GET
+	switch r.Method {
+	case http.MethodGet, http.MethodHead:
+	default:
+		return http.StatusMethodNotAllowed, nil
 	}
 
 	var dirents []os.FileInfo
+	var lastModTime time.Time
 	fpath := r.URL.Path
 	if idx, ok := middleware.IndexFile(md.FileSys, fpath, md.IndexFiles); ok {
 		// We're serving a directory index file, which may be a markdown
 		// file with a template.  Let's grab a list of files this directory
 		// URL points to, and pass that in to any possible template invocations,
 		// so that templates can customize the look and feel of a directory.
-
 		fdp, err := md.FileSys.Open(fpath)
 		if err != nil {
+			if os.IsPermission(err) {
+				return http.StatusForbidden, err
+			}
 			return http.StatusInternalServerError, err
 		}
-			dirents, err = fdp.Readdir(-1)
-			if err != nil {
-				return http.StatusInternalServerError, err
+
+		// Grab a possible set of directory entries.  Note, we do not check
+		// for errors here (unreadable directory, for example).  It may
+		// still be useful to have a directory template file, without the
+		// directory contents being present.
+		dirents, _ = fdp.Readdir(-1)
+		for _, d := range dirents {
+			lastModTime = latest(lastModTime, d.ModTime())
 		}
 
 		// Set path to found index file
@@ -105,6 +127,7 @@ func (md Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error
 		if err != nil {
 			return http.StatusNotFound, nil
 		}
+		lastModTime = latest(lastModTime, fs.ModTime())
 
 		body, err := ioutil.ReadAll(f)
 		if err != nil {
@@ -128,12 +151,26 @@ func (md Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error
 		// 	return http.StatusInternalServerError, err
 		// }
 
-			middleware.SetLastModifiedHeader(w, fs.ModTime())
+		middleware.SetLastModifiedHeader(w, lastModTime)
+		if r.Method == "GET" {
 			w.Write(html)
-			return http.StatusOK, nil
 		}
+		return http.StatusOK, nil
 	}
 
 	// Didn't qualify to serve as markdown; pass-thru
 	return md.Next.ServeHTTP(w, r)
 }
+
+// latest returns the latest time.Time
+func latest(t ...time.Time) time.Time {
+	var last time.Time
+
+	for _, tt := range t {
+		if tt.After(last) {
+			last = tt
+		}
+	}
+
+	return last
+}