mirror of
https://github.com/caddyserver/caddy.git
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132 lines
3.4 KiB
Go
132 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(Handler)
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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(Handler)
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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 *Handler, 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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