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https://github.com/caddyserver/caddy.git
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005a11cf4b
Before this change, only response headers could be manipulated with the Caddyfile's 'header' directive. Also handle the request Host header specially, since the Go standard library treats it separately from the other header fields...
133 lines
3.4 KiB
Go
133 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 headers
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import (
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"net/http"
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"strings"
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"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
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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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httpcaddyfile.RegisterHandlerDirective("headers", parseCaddyfile)
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httpcaddyfile.RegisterHandlerDirective("request_header", parseReqHdrCaddyfile)
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}
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// parseCaddyfile sets up the handler for response headers from
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// Caddyfile tokens. Syntax:
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//
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// headers [<matcher>] [[+|-]<field> <value>] {
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// [+][<field>] [<value>]
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// [-<field>]
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// }
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//
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// Either a block can be opened or a single header field can be configured
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// in the first line, but not both in the same directive.
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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hdr := new(Headers)
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for h.Next() {
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// first see if headers are in the initial line
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var hasArgs bool
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if h.NextArg() {
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hasArgs = true
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field := h.Val()
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var value string
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if h.NextArg() {
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value = h.Val()
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}
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processCaddyfileLineRespHdr(hdr, field, value)
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}
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// if not, they should be in a block
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for h.NextBlock(0) {
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if hasArgs {
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return nil, h.Err("cannot specify headers in both arguments and block")
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}
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field := h.Val()
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var value string
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if h.NextArg() {
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value = h.Val()
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}
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processCaddyfileLineRespHdr(hdr, field, value)
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}
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}
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return hdr, nil
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}
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// parseReqHdrCaddyfile sets up the handler for request headers
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// from Caddyfile tokens. Syntax:
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//
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// request_header [<matcher>] [[+|-]<field> <value>]
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//
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func parseReqHdrCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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hdr := new(Headers)
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for h.Next() {
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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field := h.Val()
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var value string
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if h.NextArg() {
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value = h.Val()
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}
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if hdr.Request == nil {
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hdr.Request = new(HeaderOps)
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}
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if strings.HasPrefix(field, "+") {
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if hdr.Request.Add == nil {
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hdr.Request.Add = make(http.Header)
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}
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hdr.Request.Add.Set(field[1:], value)
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} else if strings.HasPrefix(field, "-") {
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hdr.Request.Delete = append(hdr.Request.Delete, field[1:])
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} else {
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if hdr.Request.Set == nil {
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hdr.Request.Set = make(http.Header)
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}
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hdr.Request.Set.Set(field, value)
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}
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if h.NextArg() {
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return nil, h.ArgErr()
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}
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}
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return hdr, nil
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}
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func processCaddyfileLineRespHdr(hdr *Headers, field, value string) {
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if hdr.Response == nil {
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hdr.Response = &RespHeaderOps{
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HeaderOps: new(HeaderOps),
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Deferred: true,
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}
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}
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if strings.HasPrefix(field, "+") {
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if hdr.Response.Add == nil {
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hdr.Response.Add = make(http.Header)
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}
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hdr.Response.Add.Set(field[1:], value)
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} else if strings.HasPrefix(field, "-") {
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hdr.Response.Delete = append(hdr.Response.Delete, field[1:])
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} else {
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if hdr.Response.Set == nil {
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hdr.Response.Set = make(http.Header)
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}
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hdr.Response.Set.Set(field, value)
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}
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}
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