Merge pull request #187 from evermax/master

redir: Preserve query string on catch-all redirect (fixes #180)

middleware/redirect/redirect.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"html"
 	"net/http"
+	"net/url"
+	"path"
 	"strings"
 
 	"github.com/mholt/caddy/middleware"
@@ -22,7 +24,22 @@ func (rd Redirect) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error
 	for _, rule := range rd.Rules {
 		if rule.From == "/" {
 			// Catchall redirect preserves path (TODO: Standardize/formalize this behavior)
-			newPath := strings.TrimSuffix(rule.To, "/") + r.URL.Path
+			toURL, err := url.Parse(rule.To)
+			if err != nil {
+				return http.StatusInternalServerError, err
+			}
+			newPath := path.Join(toURL.Host, toURL.Path, r.URL.Path)
+			if strings.HasSuffix(r.URL.Path, "/") {
+				newPath = newPath + "/"
+			}
+			newPath = toURL.Scheme + "://" + newPath
+			parameters := toURL.Query()
+			for k, v := range r.URL.Query() {
+				parameters.Set(k, v[0])
+			}
+			if len(parameters) > 0 {
+				newPath = newPath + "?" + parameters.Encode()
+			}
 			if rule.Meta {
 				fmt.Fprintf(w, metaRedir, html.EscapeString(newPath))
 			} else {

middleware/redirect/redirect_test.go

@@ -39,6 +39,43 @@ func TestMetaRedirect(t *testing.T) {
 	}
 }
 
+func TestParametersRedirect(t *testing.T) {
+	re := Redirect{
+		Rules: []Rule{
+			{From: "/", Meta: false, To: "http://example.com/"},
+		},
+	}
+
+	req, err := http.NewRequest("GET", "/a?b=c", nil)
+	if err != nil {
+		t.Fatalf("Test: Could not create HTTP request: %v", err)
+	}
+
+	rec := httptest.NewRecorder()
+	re.ServeHTTP(rec, req)
+
+	if "http://example.com/a?b=c" != rec.Header().Get("Location") {
+		t.Fatalf("Test: expected location header %q but was %q", "http://example.com/a?b=c", rec.Header().Get("Location"))
+	}
+
+	re = Redirect{
+		Rules: []Rule{
+			{From: "/", Meta: false, To: "http://example.com/a?b=c"},
+		},
+	}
+
+	req, err = http.NewRequest("GET", "/d?e=f", nil)
+	if err != nil {
+		t.Fatalf("Test: Could not create HTTP request: %v", err)
+	}
+
+	re.ServeHTTP(rec, req)
+
+	if "http://example.com/a/d?b=c&e=f" != rec.Header().Get("Location") {
+		t.Fatalf("Test: expected location header %q but was %q", "http://example.com/a/d?b=c&e=f", rec.Header().Get("Location"))
+	}
+}
+
 func TestRedirect(t *testing.T) {
 	for i, test := range []struct {
 		from             string