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// 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 rewrite
import (
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"go.uber.org/zap"
)
func init() {
caddy.RegisterModule(Rewrite{})
}
// Rewrite is a middleware which can rewrite HTTP requests.
type Rewrite struct {
Method string `json:"method,omitempty"`
URI string `json:"uri,omitempty"`
StripPathPrefix string `json:"strip_path_prefix,omitempty"`
StripPathSuffix string `json:"strip_path_suffix,omitempty"`
HTTPRedirect caddyhttp.WeakString `json:"http_redirect,omitempty"`
Rehandle bool `json:"rehandle,omitempty"`
logger *zap.Logger
}
// CaddyModule returns the Caddy module information.
func (Rewrite) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.rewrite",
New: func() caddy.Module { return new(Rewrite) },
}
}
// Provision sets up rewr.
func (rewr *Rewrite) Provision(ctx caddy.Context) error {
rewr.logger = ctx.Logger(rewr)
return nil
}
// Validate ensures rewr's configuration is valid.
func (rewr Rewrite) Validate() error {
if rewr.HTTPRedirect != "" && rewr.Rehandle {
return fmt.Errorf("cannot be configured to both write a redirect response and rehandle internally")
}
return nil
}
func (rewr Rewrite) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
repl := r.Context().Value(caddy.ReplacerCtxKey).(caddy.Replacer)
var changed bool
logger := rewr.logger.With(
zap.Object("request", caddyhttp.LoggableHTTPRequest{Request: r}),
)
// rewrite the method
if rewr.Method != "" {
method := r.Method
r.Method = strings.ToUpper(repl.ReplaceAll(rewr.Method, ""))
if r.Method != method {
changed = true
}
}
// rewrite the URI
if rewr.URI != "" {
oldURI := r.RequestURI
newURI := repl.ReplaceAll(rewr.URI, "")
u, err := url.Parse(newURI)
if err != nil {
return caddyhttp.Error(http.StatusInternalServerError, err)
}
r.RequestURI = newURI
r.URL.Path = u.Path
if u.RawQuery != "" {
r.URL.RawQuery = u.RawQuery
}
if u.Fragment != "" {
r.URL.Fragment = u.Fragment
}
if newURI != oldURI {
changed = true
}
}
// strip path prefix or suffix
if rewr.StripPathPrefix != "" {
prefix := repl.ReplaceAll(rewr.StripPathPrefix, "")
r.URL.Path = strings.TrimPrefix(r.URL.Path, prefix)
newURI := r.URL.String()
if newURI != r.RequestURI {
changed = true
}
r.RequestURI = newURI
}
if rewr.StripPathSuffix != "" {
suffix := repl.ReplaceAll(rewr.StripPathSuffix, "")
r.URL.Path = strings.TrimSuffix(r.URL.Path, suffix)
newURI := r.URL.String()
if newURI != r.RequestURI {
changed = true
}
r.RequestURI = newURI
}
if changed {
logger.Debug("rewrote request",
zap.String("method", r.Method),
zap.String("uri", r.RequestURI),
)
if rewr.Rehandle {
return caddyhttp.ErrRehandle
}
if rewr.HTTPRedirect != "" {
statusCode, err := strconv.Atoi(repl.ReplaceAll(rewr.HTTPRedirect.String(), ""))
if err != nil {
return caddyhttp.Error(http.StatusInternalServerError, err)
}
w.Header().Set("Location", r.RequestURI)
w.WriteHeader(statusCode)
return nil
}
}
return next.ServeHTTP(w, r)
}
// Interface guard
var _ caddyhttp.MiddlewareHandler = (*Rewrite)(nil)
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