mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-23 22:27:38 -05:00
6004d3f779
* inital map implementation * resolve the value during middleware execution * use regex instead * pr feedback * renamed mmap to maphandler * refactored GetString implementation * fixed mispelling * additional feedback
105 lines
3.1 KiB
Go
105 lines
3.1 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
|
|
//
|
|
// 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 maphandler
|
|
|
|
import (
|
|
"net/http"
|
|
"regexp"
|
|
|
|
"github.com/caddyserver/caddy/v2"
|
|
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
|
|
)
|
|
|
|
func init() {
|
|
caddy.RegisterModule(Handler{})
|
|
}
|
|
|
|
// Handler is a middleware that maps a source placeholder to a destination
|
|
// placeholder.
|
|
//
|
|
// The mapping process happens early in the request handling lifecycle so that
|
|
// the Destination placeholder is calculated and available for substitution.
|
|
// The Items array contains pairs of regex expressions and values, the
|
|
// Source is matched against the expression, if they match then the destination
|
|
// placeholder is set to the value.
|
|
//
|
|
// The Default is optional, if no Item expression is matched then the value of
|
|
// the Default will be used.
|
|
//
|
|
type Handler struct {
|
|
// Source is a placeholder
|
|
Source string `json:"source,omitempty"`
|
|
// Destination is a new placeholder
|
|
Destination string `json:"destination,omitempty"`
|
|
// Default is an optional value to use if no other was found
|
|
Default string `json:"default,omitempty"`
|
|
// Items is an array of regex expressions and values
|
|
Items []Item `json:"items,omitempty"`
|
|
}
|
|
|
|
// CaddyModule returns the Caddy module information.
|
|
func (Handler) CaddyModule() caddy.ModuleInfo {
|
|
return caddy.ModuleInfo{
|
|
ID: "http.handlers.map",
|
|
New: func() caddy.Module { return new(Handler) },
|
|
}
|
|
}
|
|
|
|
// Provision will compile all regular expressions
|
|
func (h *Handler) Provision(_ caddy.Context) error {
|
|
for i := 0; i < len(h.Items); i++ {
|
|
h.Items[i].compiled = regexp.MustCompile(h.Items[i].Expression)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
|
|
repl := r.Context().Value(caddy.ReplacerCtxKey).(*caddy.Replacer)
|
|
|
|
// get the source value, if the source value was not found do no
|
|
// replacement.
|
|
val, ok := repl.GetString(h.Source)
|
|
if ok {
|
|
found := false
|
|
for i := 0; i < len(h.Items); i++ {
|
|
if h.Items[i].compiled.MatchString(val) {
|
|
found = true
|
|
repl.Set(h.Destination, h.Items[i].Value)
|
|
break
|
|
}
|
|
}
|
|
|
|
if !found && h.Default != "" {
|
|
repl.Set(h.Destination, h.Default)
|
|
}
|
|
}
|
|
return next.ServeHTTP(w, r)
|
|
}
|
|
|
|
// Item defines each entry in the map
|
|
type Item struct {
|
|
// Expression is the regular expression searched for
|
|
Expression string `json:"expression,omitempty"`
|
|
// Value to use once the expression has been found
|
|
Value string `json:"value,omitempty"`
|
|
// compiled expression, internal use
|
|
compiled *regexp.Regexp
|
|
}
|
|
|
|
// Interface guards
|
|
var (
|
|
_ caddy.Provisioner = (*Handler)(nil)
|
|
_ caddyhttp.MiddlewareHandler = (*Handler)(nil)
|
|
)
|