TUN-528: Move cloudflared into a separate repo

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

@@ -0,0 +1,129 @@
+// 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 rewrite
+
+import (
+	"net/http"
+	"strings"
+
+	"github.com/mholt/caddy"
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+func init() {
+	caddy.RegisterPlugin("rewrite", caddy.Plugin{
+		ServerType: "http",
+		Action:     setup,
+	})
+}
+
+// setup configures a new Rewrite middleware instance.
+func setup(c *caddy.Controller) error {
+	rewrites, err := rewriteParse(c)
+	if err != nil {
+		return err
+	}
+
+	cfg := httpserver.GetConfig(c)
+
+	cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
+		return Rewrite{
+			Next:    next,
+			FileSys: http.Dir(cfg.Root),
+			Rules:   rewrites,
+		}
+	})
+
+	return nil
+}
+
+func rewriteParse(c *caddy.Controller) ([]httpserver.HandlerConfig, error) {
+	var rules []httpserver.HandlerConfig
+
+	for c.Next() {
+		var rule Rule
+		var err error
+		var base = "/"
+		var pattern, to string
+		var ext []string
+		var negate bool
+
+		args := c.RemainingArgs()
+
+		var matcher httpserver.RequestMatcher
+
+		switch len(args) {
+		case 1:
+			base = args[0]
+			fallthrough
+		case 0:
+			// Integrate request matcher for 'if' conditions.
+			matcher, err = httpserver.SetupIfMatcher(c)
+			if err != nil {
+				return nil, err
+			}
+
+			for c.NextBlock() {
+				if httpserver.IfMatcherKeyword(c) {
+					continue
+				}
+				switch c.Val() {
+				case "r", "regexp":
+					if !c.NextArg() {
+						return nil, c.ArgErr()
+					}
+					pattern = c.Val()
+				case "to":
+					args1 := c.RemainingArgs()
+					if len(args1) == 0 {
+						return nil, c.ArgErr()
+					}
+					to = strings.Join(args1, " ")
+				case "ext":
+					args1 := c.RemainingArgs()
+					if len(args1) == 0 {
+						return nil, c.ArgErr()
+					}
+					ext = args1
+				default:
+					return nil, c.ArgErr()
+				}
+			}
+			// ensure to is specified
+			if to == "" {
+				return nil, c.ArgErr()
+			}
+			if rule, err = NewComplexRule(base, pattern, to, ext, matcher); err != nil {
+				return nil, err
+			}
+			rules = append(rules, rule)
+
+		// the only unhandled case is 2 and above
+		default:
+			if args[0] == "not" {
+				negate = true
+				args = args[1:]
+			}
+			rule, err = NewSimpleRule(args[0], strings.Join(args[1:], " "), negate)
+			if err != nil {
+				return nil, err
+			}
+			rules = append(rules, rule)
+		}
+
+	}
+
+	return rules, nil
+}