Moved rewrite middleware into its own package

middleware/rewrite/rewrite.go

@@ -0,0 +1,48 @@
+// Package rewrite is middleware for rewriting requests internally to
+// a different path.
+package rewrite
+
+import (
+	"net/http"
+
+	"github.com/mholt/caddy/middleware"
+)
+
+// New instantiates a new rewrite middleware.
+func New(c middleware.Controller) (middleware.Middleware, error) {
+	var rewrites []rewrite
+
+	for c.Next() {
+		var rule rewrite
+
+		if !c.NextArg() {
+			return nil, c.ArgErr()
+		}
+		rule.From = c.Val()
+
+		if !c.NextArg() {
+			return nil, c.ArgErr()
+		}
+		rule.To = c.Val()
+
+		rewrites = append(rewrites, rule)
+	}
+
+	return func(next http.HandlerFunc) http.HandlerFunc {
+		return func(w http.ResponseWriter, r *http.Request) {
+			for _, rule := range rewrites {
+				if r.URL.Path == rule.From {
+					r.URL.Path = rule.To
+					break
+				}
+			}
+			next(w, r)
+		}
+	}, nil
+}
+
+// rewrite describes an internal location rewrite rule.
+type rewrite struct {
+	From string
+	To   string
+}