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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
79 lines
1.9 KiB
Go
79 lines
1.9 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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"strings"
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)
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// linkResource contains the results of a parsed Link header.
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type linkResource struct {
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uri string
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params map[string]string
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}
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// parseLinkHeader is responsible for parsing Link header
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// and returning list of found resources.
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//
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// Accepted formats are:
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//
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// Link: <resource>; as=script
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// Link: <resource>; as=script,<resource>; as=style
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// Link: <resource>;<resource2>
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//
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// where <resource> begins with a forward slash (/).
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func parseLinkHeader(header string) []linkResource {
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resources := []linkResource{}
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if header == "" {
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return resources
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}
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for _, link := range strings.Split(header, comma) {
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l := linkResource{params: make(map[string]string)}
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li, ri := strings.Index(link, "<"), strings.Index(link, ">")
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if li == -1 || ri == -1 {
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continue
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}
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l.uri = strings.TrimSpace(link[li+1 : ri])
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for _, param := range strings.Split(strings.TrimSpace(link[ri+1:]), semicolon) {
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parts := strings.SplitN(strings.TrimSpace(param), equal, 2)
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key := strings.TrimSpace(parts[0])
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if key == "" {
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continue
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}
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if len(parts) == 1 {
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l.params[key] = key
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}
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if len(parts) == 2 {
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l.params[key] = strings.TrimSpace(parts[1])
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}
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}
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resources = append(resources, l)
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}
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return resources
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}
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const (
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comma = ","
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semicolon = ";"
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equal = "="
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)
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