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caddyfile.go
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caddyfile.go
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// Copyright 2015 Matthew Holt
//
// 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 replaceresponse
import (
"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("replace", parseCaddyfile)
}
// parseCaddyfile unmarshals tokens from h into a new Handler.
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
handler := new(Handler)
err := handler.UnmarshalCaddyfile(h.Dispenser)
return handler, err
}
// UnmarshalCaddyfile implements caddyfile.Unmarshaler. Syntax:
//
// replace [stream | [re] <search> <replace>] {
// stream
// match {
// header Content-Type application/json*
// }
// [re] <search> <replace>
// }
//
// If 're' is specified, the search string will be treated as a regular expression.
// If 'stream' is specified, the replacement will happen without buffering the
// whole response body; this might remove the Content-Length header.
func (h *Handler) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
line := func(isBlock bool) error {
var repl Replacement
switch d.Val() {
case "stream":
if h.Stream {
return d.Err("streaming already enabled")
}
h.Stream = true
if d.NextArg() {
return d.ArgErr()
}
return nil
case "re":
if !d.AllArgs(&repl.SearchRegexp, &repl.Replace) {
return d.ArgErr()
}
default:
if isBlock && d.Val() == "match" {
if h.Matcher != nil {
return d.Err("match block already specified")
}
responseMatchers := make(map[string]caddyhttp.ResponseMatcher)
err := caddyhttp.ParseNamedResponseMatcher(d.NewFromNextSegment(), responseMatchers)
if err != nil {
return err
}
matcher := responseMatchers["match"]
h.Matcher = &matcher
return nil
}
repl.Search = d.Val()
if !d.NextArg() {
return d.ArgErr()
}
repl.Replace = d.Val()
if d.NextArg() {
return d.ArgErr()
}
}
h.Replacements = append(h.Replacements, &repl)
return nil
}
for d.Next() {
if d.NextArg() {
if err := line(false); err != nil {
return err
}
}
for nesting := d.Nesting(); d.NextBlock(nesting); {
if err := line(true); err != nil {
return err
}
}
}
return nil
}