woodpecker/server/web/web.go

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// Copyright 2018 Drone.IO Inc.
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//
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// 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
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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
// 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.
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package web
import (
"crypto/md5"
"fmt"
"net/http"
"net/url"
"regexp"
"strings"
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"time"
"github.com/gin-gonic/gin"
"github.com/rs/zerolog/log"
"github.com/woodpecker-ci/woodpecker/server"
"github.com/woodpecker-ci/woodpecker/web"
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)
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// etag is an identifier for a resource version
// it lets caches determine if resource is still the same and not send it again
var (
etag = fmt.Sprintf("%x", md5.Sum([]byte(time.Now().String())))
indexHTML []byte
)
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type prefixFS struct {
fs http.FileSystem
prefix string
}
func (f *prefixFS) Open(name string) (http.File, error) {
return f.fs.Open(strings.TrimPrefix(name, f.prefix))
}
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// New returns a gin engine to serve the web frontend.
func New() (*gin.Engine, error) {
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e := gin.New()
indexHTML = parseIndex()
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e.Use(setupCache)
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rootURL, _ := url.Parse(server.Config.Server.RootURL)
rootPath := rootURL.Path
httpFS, err := web.HTTPFS()
if err != nil {
return nil, err
}
h := http.FileServer(&prefixFS{httpFS, rootPath})
e.GET(rootPath+"/favicon.svg", redirect(server.Config.Server.RootURL+"/favicons/favicon-light-default.svg", http.StatusPermanentRedirect))
e.GET(rootPath+"/favicons/*filepath", gin.WrapH(h))
e.GET(rootPath+"/assets/*filepath", gin.WrapH(h))
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e.NoRoute(handleIndex)
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return e, nil
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}
// redirect return gin helper to redirect a request
func redirect(location string, status ...int) func(ctx *gin.Context) {
return func(ctx *gin.Context) {
code := http.StatusFound
if len(status) == 1 {
code = status[0]
}
http.Redirect(ctx.Writer, ctx.Request, location, code)
}
}
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func handleIndex(c *gin.Context) {
rw := c.Writer
rw.Header().Set("Content-Type", "text/html; charset=UTF-8")
rw.WriteHeader(http.StatusOK)
if _, err := rw.Write(indexHTML); err != nil {
log.Error().Err(err).Msg("can not write index.html")
}
}
func parseIndex() []byte {
data, err := web.Lookup("index.html")
if err != nil {
log.Fatal().Err(err).Msg("can not find index.html")
}
if server.Config.Server.RootURL == "" {
return data
}
return regexp.MustCompile(`/\S+\.(js|css|png|svg)`).ReplaceAll(data, []byte(server.Config.Server.RootURL+"$0"))
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}
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func setupCache(c *gin.Context) {
c.Writer.Header().Set("Cache-Control", "public, max-age=31536000")
c.Writer.Header().Del("Expires")
c.Writer.Header().Set("ETag", etag)
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}