mirror of
https://github.com/caddyserver/caddy.git
synced 2024-12-16 21:56:40 -05:00
135 lines
3.4 KiB
Go
135 lines
3.4 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rewrite
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import (
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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"github.com/caddyserver/caddy/v2"
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"github.com/caddyserver/caddy/v2/modules/caddyhttp"
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)
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func init() {
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caddy.RegisterModule(Rewrite{})
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}
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// Rewrite is a middleware which can rewrite HTTP requests.
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type Rewrite struct {
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Method string `json:"method,omitempty"`
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URI string `json:"uri,omitempty"`
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StripPathPrefix string `json:"strip_path_prefix,omitempty"`
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StripPathSuffix string `json:"strip_path_suffix,omitempty"`
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HTTPRedirect caddyhttp.WeakString `json:"http_redirect,omitempty"`
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Rehandle bool `json:"rehandle,omitempty"`
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}
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// CaddyModule returns the Caddy module information.
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func (Rewrite) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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Name: "http.handlers.rewrite",
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New: func() caddy.Module { return new(Rewrite) },
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}
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}
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// Validate ensures rewr's configuration is valid.
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func (rewr Rewrite) Validate() error {
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if rewr.HTTPRedirect != "" && rewr.Rehandle {
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return fmt.Errorf("cannot be configured to both write a redirect response and rehandle internally")
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}
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return nil
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}
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func (rewr Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
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repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
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var changed bool
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// rewrite the method
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if rewr.Method != "" {
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method := r.Method
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r.Method = strings.ToUpper(repl.ReplaceAll(rewr.Method, ""))
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if r.Method != method {
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changed = true
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}
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}
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// rewrite the URI
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if rewr.URI != "" {
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oldURI := r.RequestURI
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newURI := repl.ReplaceAll(rewr.URI, "")
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u, err := url.Parse(newURI)
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if err != nil {
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return caddyhttp.Error(http.StatusInternalServerError, err)
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}
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r.RequestURI = newURI
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r.URL.Path = u.Path
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if u.RawQuery != "" {
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r.URL.RawQuery = u.RawQuery
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}
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if u.Fragment != "" {
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r.URL.Fragment = u.Fragment
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}
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if newURI != oldURI {
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changed = true
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}
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}
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// strip path prefix or suffix
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if rewr.StripPathPrefix != "" {
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prefix := repl.ReplaceAll(rewr.StripPathPrefix, "")
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r.URL.Path = strings.TrimPrefix(r.URL.Path, prefix)
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newURI := r.URL.String()
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if newURI != r.RequestURI {
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changed = true
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}
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r.RequestURI = newURI
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}
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if rewr.StripPathSuffix != "" {
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suffix := repl.ReplaceAll(rewr.StripPathSuffix, "")
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r.URL.Path = strings.TrimSuffix(r.URL.Path, suffix)
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newURI := r.URL.String()
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if newURI != r.RequestURI {
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changed = true
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}
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r.RequestURI = newURI
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}
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if changed && rewr.Rehandle {
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return caddyhttp.ErrRehandle
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}
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if changed && rewr.HTTPRedirect != "" {
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statusCode, err := strconv.Atoi(repl.ReplaceAll(rewr.HTTPRedirect.String(), ""))
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if err != nil {
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return caddyhttp.Error(http.StatusInternalServerError, err)
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}
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w.Header().Set("Location", r.RequestURI)
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w.WriteHeader(statusCode)
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return nil
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}
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return next.ServeHTTP(w, r)
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}
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// Interface guard
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var _ caddyhttp.MiddlewareHandler = (*Rewrite)(nil)
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