Added documentation to functions and basic JWT generation

handlers/static.go

@@ -5,26 +5,43 @@ import (
 	"os"
 )
 
+// Wrapper for default FileSystem
 type justFilesFilesystem struct {
 	fs http.FileSystem
 }
 
+// Wrapper for default File
 type neuteredReaddirFile struct {
 	http.File
 }
 
+// Modifies the behavior of FileSystem.Open to return the neutered version of File
 func (fs justFilesFilesystem) Open(name string) (http.File, error) {
 	f, err := fs.fs.Open(name)
 	if err != nil {
 		return nil, err
 	}
+
+	// Check if the requested path is a directory
+	// and explicitly return an error to trigger a 404
+	fileInfo, err := f.Stat()
+	if err != nil {
+		return nil, err
+	}
+	if fileInfo.IsDir() {
+		return nil, os.ErrNotExist
+	}
+
 	return neuteredReaddirFile{f}, nil
 }
 
+// Overrides the Readdir method of File to always return nil
 func (f neuteredReaddirFile) Readdir(count int) ([]os.FileInfo, error) {
 	return nil, nil
 }
 
+// Handles requests for static files, without allowing access to the
+// directory viewer and returning 404 if an exact file is not found
 func HandleStatic() http.Handler {
 	return http.HandlerFunc(
 		func(w http.ResponseWriter, r *http.Request) {