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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 push
import (
"github.com/caddyserver/caddy/v2/caddyconfig/httpcaddyfile"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
)
func init() {
httpcaddyfile.RegisterHandlerDirective("push", parseCaddyfile)
}
// parseCaddyfile sets up the push handler. Syntax:
//
// push [<matcher>] [<resource>] {
// [GET|HEAD] <resource>
// headers {
// [+]<field> [<value|regexp> [<replacement>]]
// -<field>
// }
// }
//
// A single resource can be specified inline without opening a
// block for the most common/simple case. Or, a block can be
// opened and multiple resources can be specified, one per
// line, optionally preceded by the method. The headers
// subdirective can be used to customize the headers that
// are set on each (synthetic) push request, using the same
// syntax as the 'header' directive for request headers.
// Placeholders are accepted in resource and header field
// name and value and replacement tokens.
func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
handler := new(Handler)
for h.Next() {
if h.NextArg() {
handler.Resources = append(handler.Resources, Resource{Target: h.Val()})
}
// optional block
for outerNesting := h.Nesting(); h.NextBlock(outerNesting); {
switch h.Val() {
case "headers":
if h.NextArg() {
return nil, h.ArgErr()
}
for innerNesting := h.Nesting(); h.NextBlock(innerNesting); {
var err error
// include current token, which we treat as an argument here
args := []string{h.Val()}
args = append(args, h.RemainingArgs()...)
if handler.Headers == nil {
handler.Headers = new(HeaderConfig)
}
switch len(args) {
case 1:
err = headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], "", "")
case 2:
err = headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], args[1], "")
case 3:
err = headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], args[1], args[2])
default:
return nil, h.ArgErr()
}
if err != nil {
return nil, h.Err(err.Error())
}
}
case "GET", "HEAD":
method := h.Val()
if !h.NextArg() {
return nil, h.ArgErr()
}
target := h.Val()
handler.Resources = append(handler.Resources, Resource{
Method: method,
Target: target,
})
default:
handler.Resources = append(handler.Resources, Resource{Target: h.Val()})
}
}
}
return handler, nil
}
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