Refactored redirect middleware

middleware/redirect/redirect.go

@@ -9,12 +9,45 @@ import (
 	"github.com/mholt/caddy/middleware"
 )
 
-// New creates a new redirect middleware.
+// New instantiates a new Rewrites middleware.
 func New(c middleware.Controller) (middleware.Middleware, error) {
-	var redirects []Redirect
+	rules, err := parse(c)
+	if err != nil {
+		return nil, err
+	}
+
+	return func(next middleware.Handler) middleware.Handler {
+		return Redirect{Next: next, Rules: rules}
+	}, nil
+}
+
+// Redirect is middleware to respond with HTTP redirects
+type Redirect struct {
+	Next  middleware.Handler
+	Rules []Rule
+}
+
+// ServeHTTP implements the middleware.Handler interface.
+func (rd Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
+	for _, rule := range rd.Rules {
+		if middleware.Path(r.URL.Path).Matches(rule.From) {
+			if rule.From == "/" {
+				// Catchall redirect preserves path (TODO: This should be made more consistent...)
+				http.Redirect(w, r, strings.TrimSuffix(rule.To, "/")+r.URL.Path, rule.Code)
+				return 0, nil
+			}
+			http.Redirect(w, r, rule.To, rule.Code)
+			return 0, nil
+		}
+	}
+	return rd.Next.ServeHTTP(w, r)
+}
+
+func parse(c middleware.Controller) ([]Rule, error) {
+	var redirects []Rule
 
 	for c.Next() {
-		var rule Redirect
+		var rule Rule
 		args := c.RemainingArgs()
 
 		if len(args) == 1 {
@@ -28,39 +61,23 @@ func New(c middleware.Controller) (middleware.Middleware, error) {
 			rule.From = args[0]
 			rule.To = args[1]
 			if code, ok := httpRedirs[args[2]]; !ok {
-				return nil, c.Err("Invalid redirect code '" + c.Val() + "'")
+				return redirects, c.Err("Invalid redirect code '" + c.Val() + "'")
 			} else {
 				rule.Code = code
 			}
 			redirects = append(redirects, rule)
 		} else {
-			return nil, c.ArgErr()
+			return redirects, c.ArgErr()
 		}
 	}
 
-	return func(next middleware.Handler) middleware.Handler {
-		return middleware.HandlerFunc(func(w http.ResponseWriter, r *http.Request) (int, error) {
-			for _, rule := range redirects {
-				if middleware.Path(r.URL.Path).Matches(rule.From) {
-					if rule.From == "/" {
-						// Catchall redirect preserves path (TODO: This should be made more consistent...)
-						http.Redirect(w, r, strings.TrimSuffix(rule.To, "/")+r.URL.Path, rule.Code)
-						return 0, nil
-					}
-					http.Redirect(w, r, rule.To, rule.Code)
-					return 0, nil
-				}
-			}
-			return next.ServeHTTP(w, r)
-		})
-	}, nil
+	return redirects, nil
 }
 
-// redirect describes an HTTP redirect rule.
-type Redirect struct {
-	From string
-	To   string
-	Code int
+// Rule describes an HTTP redirect rule.
+type Rule struct {
+	From, To string
+	Code     int
 }
 
 // httpRedirs is a list of supported HTTP redirect codes.