use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/mholt/caddy/caddyhttp/extensions/setup.go

@@ -0,0 +1,67 @@
+// Copyright 2015 Light Code Labs, LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package extensions
+
+import (
+	"github.com/mholt/caddy"
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+func init() {
+	caddy.RegisterPlugin("ext", caddy.Plugin{
+		ServerType: "http",
+		Action:     setup,
+	})
+}
+
+// setup configures a new instance of 'extensions' middleware for clean URLs.
+func setup(c *caddy.Controller) error {
+	cfg := httpserver.GetConfig(c)
+	root := cfg.Root
+
+	exts, err := extParse(c)
+	if err != nil {
+		return err
+	}
+
+	httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
+		return Ext{
+			Next:       next,
+			Extensions: exts,
+			Root:       root,
+		}
+	})
+
+	return nil
+}
+
+// extParse sets up an instance of extension middleware
+// from a middleware controller and returns a list of extensions.
+func extParse(c *caddy.Controller) ([]string, error) {
+	var exts []string
+
+	for c.Next() {
+		// At least one extension is required
+		if !c.NextArg() {
+			return exts, c.ArgErr()
+		}
+		exts = append(exts, c.Val())
+
+		// Tack on any other extensions that may have been listed
+		exts = append(exts, c.RemainingArgs()...)
+	}
+
+	return exts, nil
+}