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6cea1f239d
* push: Implement HTTP/2 server push (close #3551) * push: Abstract header ops by embedding into new struct type This will allow us to add more fields to customize headers in push-specific ways in the future. * push: Ensure Link resources are pushed before response is written * Change header name from X-Caddy-Push to Caddy-Push
100 lines
3.0 KiB
Go
100 lines
3.0 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 push
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import (
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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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"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
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)
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func init() {
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httpcaddyfile.RegisterHandlerDirective("push", parseCaddyfile)
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}
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// parseCaddyfile sets up the push handler. Syntax:
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//
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// push [<matcher>] [<resource>] {
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// [GET|HEAD] <resource>
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// headers {
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// [+]<field> [<value|regexp> [<replacement>]]
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// -<field>
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// }
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// }
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//
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// A single resource can be specified inline without opening a
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// block for the most common/simple case. Or, a block can be
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// opened and multiple resources can be specified, one per
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// line, optionally preceded by the method. The headers
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// subdirective can be used to customize the headers that
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// are set on each (synthetic) push request, using the same
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// syntax as the 'header' directive for request headers.
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// Placeholders are accepted in resource and header field
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// name and value and replacement tokens.
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func parseCaddyfile(h httpcaddyfile.Helper) (caddyhttp.MiddlewareHandler, error) {
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handler := new(Handler)
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for h.Next() {
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if h.NextArg() {
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handler.Resources = append(handler.Resources, Resource{Target: h.Val()})
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}
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// optional block
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for outerNesting := h.Nesting(); h.NextBlock(outerNesting); {
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switch h.Val() {
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case "headers":
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if h.NextArg() {
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return nil, h.ArgErr()
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}
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for innerNesting := h.Nesting(); h.NextBlock(innerNesting); {
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// include current token, which we treat as an argument here
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args := []string{h.Val()}
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args = append(args, h.RemainingArgs()...)
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if handler.Headers == nil {
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handler.Headers = new(HeaderConfig)
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}
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switch len(args) {
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case 1:
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headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], "", "")
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case 2:
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headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], args[1], "")
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case 3:
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headers.CaddyfileHeaderOp(&handler.Headers.HeaderOps, args[0], args[1], args[2])
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default:
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return nil, h.ArgErr()
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}
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}
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case "GET", "HEAD":
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method := h.Val()
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if !h.NextArg() {
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return nil, h.ArgErr()
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}
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target := h.Val()
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handler.Resources = append(handler.Resources, Resource{
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Method: method,
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Target: target,
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})
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default:
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handler.Resources = append(handler.Resources, Resource{Target: h.Val()})
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}
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}
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}
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return handler, nil
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}
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