TUN-528: Move cloudflared into a separate repo

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

@@ -0,0 +1,134 @@
+// 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 errors
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/mholt/caddy"
+	"github.com/mholt/caddy/caddyhttp/httpserver"
+)
+
+// setup configures a new errors middleware instance.
+func setup(c *caddy.Controller) error {
+	handler, err := errorsParse(c)
+
+	if err != nil {
+		return err
+	}
+
+	handler.Log.Attach(c)
+
+	httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
+		handler.Next = next
+		return handler
+	})
+
+	return nil
+}
+
+func errorsParse(c *caddy.Controller) (*ErrorHandler, error) {
+
+	// Very important that we make a pointer because the startup
+	// function that opens the log file must have access to the
+	// same instance of the handler, not a copy.
+	handler := &ErrorHandler{
+		ErrorPages: make(map[int]string),
+		Log:        &httpserver.Logger{},
+	}
+
+	cfg := httpserver.GetConfig(c)
+
+	optionalBlock := func() error {
+		for c.NextBlock() {
+
+			what := c.Val()
+			where := c.RemainingArgs()
+
+			if httpserver.IsLogRollerSubdirective(what) {
+				var err error
+				err = httpserver.ParseRoller(handler.Log.Roller, what, where...)
+				if err != nil {
+					return err
+				}
+			} else {
+				if len(where) != 1 {
+					return c.ArgErr()
+				}
+				where := where[0]
+
+				// Error page; ensure it exists
+				if !filepath.IsAbs(where) {
+					where = filepath.Join(cfg.Root, where)
+				}
+
+				f, err := os.Open(where)
+				if err != nil {
+					log.Printf("[WARNING] Unable to open error page '%s': %v", where, err)
+				}
+				f.Close()
+
+				if what == "*" {
+					if handler.GenericErrorPage != "" {
+						return c.Errf("Duplicate status code entry: %s", what)
+					}
+					handler.GenericErrorPage = where
+				} else {
+					whatInt, err := strconv.Atoi(what)
+					if err != nil {
+						return c.Err("Expecting a numeric status code or '*', got '" + what + "'")
+					}
+
+					if _, exists := handler.ErrorPages[whatInt]; exists {
+						return c.Errf("Duplicate status code entry: %s", what)
+					}
+
+					handler.ErrorPages[whatInt] = where
+				}
+			}
+		}
+		return nil
+	}
+
+	for c.Next() {
+		// weird hack to avoid having the handler values overwritten.
+		if c.Val() == "}" {
+			continue
+		}
+
+		args := c.RemainingArgs()
+
+		if len(args) == 1 {
+			switch args[0] {
+			case "visible":
+				handler.Debug = true
+			default:
+				handler.Log.Output = args[0]
+				handler.Log.Roller = httpserver.DefaultLogRoller()
+			}
+		}
+
+		// Configuration may be in a block
+		err := optionalBlock()
+		if err != nil {
+			return handler, err
+		}
+	}
+
+	return handler, nil
+}