mirror of
https://github.com/caddyserver/caddy.git
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89 lines
2.3 KiB
Go
89 lines
2.3 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 markdown
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import (
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"bytes"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"github.com/russross/blackfriday/v2"
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"github.com/caddyserver/caddy/v2"
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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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caddy.RegisterModule(Markdown{})
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}
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// Markdown is a middleware for rendering a Markdown response body.
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type Markdown struct {
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}
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// CaddyModule returns the Caddy module information.
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func (Markdown) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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Name: "http.handlers.markdown",
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New: func() caddy.Module { return new(Markdown) },
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}
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}
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func (m Markdown) ServeHTTP(w http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
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buf := bufPool.Get().(*bytes.Buffer)
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buf.Reset()
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defer bufPool.Put(buf)
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shouldBuf := func(status int, header http.Header) bool {
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return strings.HasPrefix(header.Get("Content-Type"), "text/")
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}
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rec := caddyhttp.NewResponseRecorder(w, buf, shouldBuf)
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err := next.ServeHTTP(rec, r)
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if err != nil {
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return err
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}
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if !rec.Buffered() {
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return nil
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}
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caddyhttp.CopyHeader(w.Header(), rec.Header())
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output := blackfriday.Run(buf.Bytes())
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w.Header().Set("Content-Length", strconv.Itoa(len(output)))
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Header().Del("Accept-Ranges") // we don't know ranges for dynamically-created content
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w.Header().Del("Etag") // don't know a way to quickly generate etag for dynamic content
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w.Header().Del("Last-Modified") // useless for dynamic content since it's always changing
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w.WriteHeader(rec.Status())
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w.Write(output)
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return nil
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}
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var bufPool = sync.Pool{
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New: func() interface{} {
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return new(bytes.Buffer)
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},
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}
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// Interface guard
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var _ caddyhttp.MiddlewareHandler = (*Markdown)(nil)
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