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Differentiating middleware and responders has one benefit, namely that it's clear which module provides the response, but even then it's not a great advantage. Linear handler config makes a little more sense, giving greater flexibility and simplifying the core a bit, even though it's slightly awkward that handlers which are responders may not use the 'next' handler that is passed in at all.
83 lines
2 KiB
Go
83 lines
2 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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"net/http"
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"net/url"
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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(caddy.Module{
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Name: "http.handlers.rewrite",
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New: func() interface{} { return new(Rewrite) },
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})
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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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Rehandle bool `json:"rehandle,omitempty"`
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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 rehandleNeeded bool
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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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rehandleNeeded = true
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}
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}
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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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rehandleNeeded = true
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}
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}
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if rehandleNeeded && rewr.Rehandle {
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return caddyhttp.ErrRehandle
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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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