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542 lines
14 KiB
Go
542 lines
14 KiB
Go
//
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// WRP - Web Rendering Proxy
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//
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// Copyright (c) 2013-2018 Antoni Sawicki
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// Copyright (c) 2019-2022 Google LLC
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//
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package main
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import (
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"bytes"
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"context"
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"embed"
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"flag"
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"fmt"
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"html/template"
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"image"
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"image/color/palette"
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"image/gif"
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"image/png"
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"io/ioutil"
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"log"
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"math"
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"math/rand"
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"net/http"
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"net/url"
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"os"
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"os/signal"
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"strconv"
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"strings"
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"syscall"
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"time"
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"github.com/MaxHalford/halfgone"
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"github.com/chromedp/cdproto/css"
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"github.com/chromedp/cdproto/emulation"
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"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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"github.com/soniakeys/quant/median"
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)
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var (
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version = "4.5.3"
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srv http.Server
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ctx context.Context
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cancel context.CancelFunc
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img = make(map[string]bytes.Buffer)
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ismap = make(map[string]wrpReq)
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noDel bool
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defType string
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defGeom geom
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htmlTmpl *template.Template
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)
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// go:embed *.html
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var fs embed.FS
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type geom struct {
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w int64
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h int64
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c int64
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}
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// Data for html template
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type uiData struct {
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Version string
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URL string
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BgColor string
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NColors int64
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Width int64
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Height int64
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Zoom float64
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ImgType string
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ImgURL string
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ImgSize string
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ImgWidth int
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ImgHeight int
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MapURL string
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PageHeight string
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}
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// Parameters for HTML print function
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type printParams struct {
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bgColor string
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pageHeight string
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imgSize string
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imgURL string
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mapURL string
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imgWidth int
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imgHeight int
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}
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// WRP Request
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type wrpReq struct {
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url string // url
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width int64 // width
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height int64 // height
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zoom float64 // zoom/scale
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colors int64 // #colors
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mouseX int64 // mouseX
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mouseY int64 // mouseY
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keys string // keys to send
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buttons string // Fn buttons
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imgType string // imgtype
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w http.ResponseWriter
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r *http.Request
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}
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// Parse HTML Form, Process Input Boxes, Etc.
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func (rq *wrpReq) parseForm() {
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rq.r.ParseForm()
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rq.url = rq.r.FormValue("url")
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if len(rq.url) > 1 && !strings.HasPrefix(rq.url, "http") {
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rq.url = fmt.Sprintf("http://www.google.com/search?q=%s", url.QueryEscape(rq.url))
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}
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rq.width, _ = strconv.ParseInt(rq.r.FormValue("w"), 10, 64)
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rq.height, _ = strconv.ParseInt(rq.r.FormValue("h"), 10, 64)
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if rq.width < 10 && rq.height < 10 {
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rq.width = defGeom.w
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rq.height = defGeom.h
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}
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rq.zoom, _ = strconv.ParseFloat(rq.r.FormValue("z"), 64)
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if rq.zoom < 0.1 {
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rq.zoom = 1.0
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}
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rq.colors, _ = strconv.ParseInt(rq.r.FormValue("c"), 10, 64)
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if rq.colors < 2 || rq.colors > 256 {
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rq.colors = defGeom.c
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}
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rq.keys = rq.r.FormValue("k")
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rq.buttons = rq.r.FormValue("Fn")
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rq.imgType = rq.r.FormValue("t")
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if rq.imgType != "fastgif" && rq.imgType != "gif" && rq.imgType != "png" {
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rq.imgType = defType
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}
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log.Printf("%s WrpReq from UI Form: %+v\n", rq.r.RemoteAddr, rq)
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}
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// Display WP UI
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func (rq *wrpReq) printHTML(p printParams) {
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rq.w.Header().Set("Cache-Control", "max-age=0")
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rq.w.Header().Set("Expires", "-1")
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rq.w.Header().Set("Pragma", "no-cache")
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rq.w.Header().Set("Content-Type", "text/html")
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data := uiData{
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Version: version,
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URL: rq.url,
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BgColor: p.bgColor,
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Width: rq.width,
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Height: rq.height,
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NColors: rq.colors,
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Zoom: rq.zoom,
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ImgType: rq.imgType,
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ImgSize: p.imgSize,
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ImgWidth: p.imgWidth,
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ImgHeight: p.imgHeight,
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ImgURL: p.imgURL,
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MapURL: p.mapURL,
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PageHeight: p.pageHeight,
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}
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err := htmlTmpl.Execute(rq.w, data)
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if err != nil {
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log.Fatal(err)
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}
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}
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// Determine what action to take
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func (rq *wrpReq) action() chromedp.Action {
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// Mouse Click
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if rq.mouseX > 0 && rq.mouseY > 0 {
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log.Printf("%s Mouse Click %d,%d\n", rq.r.RemoteAddr, rq.mouseX, rq.mouseY)
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return chromedp.MouseClickXY(float64(rq.mouseX)/float64(rq.zoom), float64(rq.mouseY)/float64(rq.zoom))
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}
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// Buttons
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if len(rq.buttons) > 0 {
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log.Printf("%s Button %v\n", rq.r.RemoteAddr, rq.buttons)
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switch rq.buttons {
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case "Bk":
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return chromedp.NavigateBack()
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case "St":
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return chromedp.Stop()
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case "Re":
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return chromedp.Reload()
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case "Bs":
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return chromedp.KeyEvent("\b")
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case "Rt":
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return chromedp.KeyEvent("\r")
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case "<":
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return chromedp.KeyEvent("\u0302")
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case "^":
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return chromedp.KeyEvent("\u0304")
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case "v":
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return chromedp.KeyEvent("\u0301")
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case ">":
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return chromedp.KeyEvent("\u0303")
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}
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}
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// Keys
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if len(rq.keys) > 0 {
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log.Printf("%s Sending Keys: %#v\n", rq.r.RemoteAddr, rq.keys)
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return chromedp.KeyEvent(rq.keys)
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}
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// Navigate to URL
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log.Printf("%s Processing Capture Request for %s\n", rq.r.RemoteAddr, rq.url)
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return chromedp.Navigate(rq.url)
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}
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// Process Keyboard and Mouse events or Navigate to the desired URL.
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func (rq *wrpReq) navigate() {
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err := chromedp.Run(ctx, rq.action())
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if err != nil {
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if err.Error() == "context canceled" {
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log.Printf("%s Contex cancelled, try again", rq.r.RemoteAddr)
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fmt.Fprintf(rq.w, "<BR>%s<BR> -- restarting, try again", err)
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ctx, cancel = chromedp.NewContext(context.Background())
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return
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}
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log.Printf("%s %s", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>%s<BR>", err)
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}
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}
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// https://github.com/chromedp/chromedp/issues/979
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func chromedpCaptureScreenshot(res *[]byte, h int64) chromedp.Action {
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if res == nil {
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panic("res cannot be nil")
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}
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if h == 0 {
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return chromedp.CaptureScreenshot(res)
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}
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return chromedp.ActionFunc(func(ctx context.Context) error {
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var err error
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*res, err = page.CaptureScreenshot().Do(ctx)
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return err
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})
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}
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// Capture currently rendered web page to an image and fake ISMAP
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func (rq *wrpReq) capture() {
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var err error
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var styles []*css.ComputedStyleProperty
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var r, g, b int
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var h int64
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var pngcap []byte
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chromedp.Run(ctx,
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emulation.SetDeviceMetricsOverride(int64(float64(rq.width)/rq.zoom), 10, rq.zoom, false),
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chromedp.Location(&rq.url),
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chromedp.ComputedStyle("body", &styles, chromedp.ByQuery),
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chromedp.ActionFunc(func(ctx context.Context) error {
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_, _, _, _, _, s, err := page.GetLayoutMetrics().Do(ctx)
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if err == nil {
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h = int64(math.Ceil(s.Height))
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}
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return nil
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}),
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)
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for _, style := range styles {
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if style.Name == "background-color" {
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fmt.Sscanf(style.Value, "rgb(%d,%d,%d)", &r, &g, &b)
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}
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}
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log.Printf("%s Landed on: %s, Height: %v\n", rq.r.RemoteAddr, rq.url, h)
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height := int64(float64(rq.height) / rq.zoom)
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if rq.height == 0 && h > 0 {
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height = h + 30
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}
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chromedp.Run(
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ctx, emulation.SetDeviceMetricsOverride(int64(float64(rq.width)/rq.zoom), height, rq.zoom, false),
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chromedp.Sleep(time.Second*2), // TODO(tenox): totally lame, find a better way to determine if page is rendered
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)
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// Capture screenshot...
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err = chromedp.Run(ctx, chromedpCaptureScreenshot(&pngcap, rq.height))
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if err != nil {
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if err.Error() == "context canceled" {
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log.Printf("%s Contex cancelled, try again", rq.r.RemoteAddr)
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fmt.Fprintf(rq.w, "<BR>%s<BR> -- restarting, try again", err)
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ctx, cancel = chromedp.NewContext(context.Background())
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return
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}
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log.Printf("%s Failed to capture screenshot: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to capture screenshot:<BR>%s<BR>\n", err)
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return
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}
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seq := rand.Intn(9999)
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imgpath := fmt.Sprintf("/img/%04d.%s", seq, rq.imgType)
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mappath := fmt.Sprintf("/map/%04d.map", seq)
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ismap[mappath] = *rq
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var ssize string
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var iw, ih int
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switch rq.imgType {
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case "fastgif":
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fallthrough
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case "gif":
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i, err := png.Decode(bytes.NewReader(pngcap))
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if err != nil {
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log.Printf("%s Failed to decode screenshot: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to decode page screenshot:<BR>%s<BR>\n", err)
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return
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}
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if rq.colors == 2 {
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gray := halfgone.ImageToGray(i)
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i = halfgone.FloydSteinbergDitherer{}.Apply(gray)
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}
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var gifbuf bytes.Buffer
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st := time.Now()
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var p *image.Paletted
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if rq.imgType == "fastgif" {
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r := i.Bounds()
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// NOTE: the color index computation below works only for palette.WebSafe!
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p = image.NewPaletted(r, palette.WebSafe)
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for y := 0; y != r.Dy(); y++ {
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for x := 0; x != r.Dx(); x++ {
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c := i.At(x, y)
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r, g, b, _ := c.RGBA()
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r6 := FastGifLut[r&0xff]
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g6 := FastGifLut[g&0xff]
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b6 := FastGifLut[b&0xff]
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p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
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}
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}
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} else {
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q := median.Quantizer(rq.colors)
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p = q.Paletted(i)
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}
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err = gif.Encode(&gifbuf, p, &gif.Options{})
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if err != nil {
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log.Printf("%s Failed to encode GIF: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to encode GIF:<BR>%s<BR>\n", err)
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return
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}
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img[imgpath] = gifbuf
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ssize = fmt.Sprintf("%.0f KB", float32(len(gifbuf.Bytes()))/1024.0)
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iw = i.Bounds().Max.X
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ih = i.Bounds().Max.Y
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log.Printf("%s Encoded GIF image: %s, Size: %s, Colors: %d, %dx%d, Time: %vms\n", rq.r.RemoteAddr, imgpath, ssize, rq.colors, iw, ih, time.Since(st).Milliseconds())
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case "png":
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pngbuf := bytes.NewBuffer(pngcap)
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img[imgpath] = *pngbuf
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cfg, _, _ := image.DecodeConfig(pngbuf)
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ssize = fmt.Sprintf("%.0f KB", float32(len(pngbuf.Bytes()))/1024.0)
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iw = cfg.Width
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ih = cfg.Height
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log.Printf("%s Got PNG image: %s, Size: %s, %dx%d\n", rq.r.RemoteAddr, imgpath, ssize, iw, ih)
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}
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rq.printHTML(printParams{
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bgColor: fmt.Sprintf("#%02X%02X%02X", r, g, b),
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pageHeight: fmt.Sprintf("%d PX", h),
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imgSize: ssize,
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imgURL: imgpath,
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mapURL: mappath,
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imgWidth: iw,
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imgHeight: ih,
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})
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log.Printf("%s Done with capture for %s\n", rq.r.RemoteAddr, rq.url)
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}
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// Process HTTP requests to WRP '/' url
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func pageServer(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s Page Request for %s [%+v]\n", r.RemoteAddr, r.URL.Path, r.URL.RawQuery)
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rq := wrpReq{
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r: r,
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w: w,
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}
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rq.parseForm()
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if len(rq.url) < 4 {
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rq.printHTML(printParams{bgColor: "#FFFFFF"})
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return
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}
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rq.navigate()
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rq.capture()
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}
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// Process HTTP requests to ISMAP '/map/' url
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func mapServer(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s ISMAP Request for %s [%+v]\n", r.RemoteAddr, r.URL.Path, r.URL.RawQuery)
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rq, ok := ismap[r.URL.Path]
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rq.r = r
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rq.w = w
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if !ok {
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fmt.Fprintf(w, "Unable to find map %s\n", r.URL.Path)
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log.Printf("Unable to find map %s\n", r.URL.Path)
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return
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}
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if !noDel {
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defer delete(ismap, r.URL.Path)
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}
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n, err := fmt.Sscanf(r.URL.RawQuery, "%d,%d", &rq.mouseX, &rq.mouseY)
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if err != nil || n != 2 {
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fmt.Fprintf(w, "n=%d, err=%s\n", n, err)
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log.Printf("%s ISMAP n=%d, err=%s\n", r.RemoteAddr, n, err)
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return
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}
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log.Printf("%s WrpReq from ISMAP: %+v\n", r.RemoteAddr, rq)
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if len(rq.url) < 4 {
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rq.printHTML(printParams{bgColor: "#FFFFFF"})
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return
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}
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rq.navigate()
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rq.capture()
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}
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// Process HTTP requests for images '/img/' url
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func imgServer(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s IMG Request for %s\n", r.RemoteAddr, r.URL.Path)
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imgbuf, ok := img[r.URL.Path]
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if !ok || imgbuf.Bytes() == nil {
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fmt.Fprintf(w, "Unable to find image %s\n", r.URL.Path)
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log.Printf("%s Unable to find image %s\n", r.RemoteAddr, r.URL.Path)
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return
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}
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if !noDel {
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defer delete(img, r.URL.Path)
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}
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switch {
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case strings.HasPrefix(r.URL.Path, ".gif"):
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w.Header().Set("Content-Type", "image/gif")
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case strings.HasPrefix(r.URL.Path, ".png"):
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w.Header().Set("Content-Type", "image/png")
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}
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w.Header().Set("Content-Length", strconv.Itoa(len(imgbuf.Bytes())))
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w.Header().Set("Cache-Control", "max-age=0")
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w.Header().Set("Expires", "-1")
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w.Header().Set("Pragma", "no-cache")
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w.Write(imgbuf.Bytes())
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w.(http.Flusher).Flush()
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}
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// Process HTTP requests for Shutdown via '/shutdown/' url
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func haltServer(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s Shutdown Request for %s\n", r.RemoteAddr, r.URL.Path)
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w.Header().Set("Cache-Control", "max-age=0")
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w.Header().Set("Expires", "-1")
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w.Header().Set("Pragma", "no-cache")
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w.Header().Set("Content-Type", "text/plain")
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fmt.Fprintf(w, "Shutting down WRP...\n")
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w.(http.Flusher).Flush()
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time.Sleep(time.Second * 2)
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cancel()
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srv.Shutdown(context.Background())
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os.Exit(1)
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}
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// returns html template, either from html file or built-in
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func tmpl(t string) string {
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var tmpl []byte
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fh, err := os.Open(t)
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if err != nil {
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goto builtin
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}
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tmpl, err = ioutil.ReadAll(fh)
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if err != nil {
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goto builtin
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}
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log.Printf("Got UI template from %v file\n", t)
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return string(tmpl)
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builtin:
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fhs, err := fs.Open("/wrp.html")
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if err != nil {
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log.Fatal(err)
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}
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tmpl, err = ioutil.ReadAll(fhs)
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if err != nil {
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log.Fatal(err)
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}
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log.Printf("Got UI template from built-in\n")
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return string(tmpl)
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}
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// Main...
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func main() {
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var addr, fgeom, tHTML string
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var headless bool
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var debug bool
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var err error
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flag.StringVar(&addr, "l", ":8080", "Listen address:port, default :8080")
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flag.BoolVar(&headless, "h", true, "Headless mode - hide browser window")
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flag.BoolVar(&debug, "d", false, "Debug ChromeDP")
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flag.BoolVar(&noDel, "n", false, "Do not free maps and images after use")
|
|
flag.StringVar(&defType, "t", "png", "Image type: fastgif|gif|png")
|
|
flag.StringVar(&fgeom, "g", "1152x600x256", "Geometry: width x height x colors, height can be 0 for unlimited")
|
|
flag.StringVar(&tHTML, "ui", "wrp.html", "HTML template file for the UI")
|
|
flag.Parse()
|
|
if len(os.Getenv("PORT")) > 0 {
|
|
addr = ":" + os.Getenv(("PORT"))
|
|
}
|
|
n, err := fmt.Sscanf(fgeom, "%dx%dx%d", &defGeom.w, &defGeom.h, &defGeom.c)
|
|
if err != nil || n != 3 {
|
|
log.Fatalf("Unable to parse -g geometry flag / %s", err)
|
|
}
|
|
|
|
opts := append(chromedp.DefaultExecAllocatorOptions[:],
|
|
chromedp.Flag("headless", headless),
|
|
chromedp.Flag("hide-scrollbars", false),
|
|
)
|
|
actx, acancel := chromedp.NewExecAllocator(context.Background(), opts...)
|
|
defer acancel()
|
|
switch debug {
|
|
case true:
|
|
ctx, cancel = chromedp.NewContext(actx, chromedp.WithDebugf(log.Printf))
|
|
default:
|
|
ctx, cancel = chromedp.NewContext(actx)
|
|
}
|
|
defer cancel()
|
|
|
|
rand.Seed(time.Now().UnixNano())
|
|
|
|
c := make(chan os.Signal)
|
|
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
|
|
go func() {
|
|
<-c
|
|
log.Printf("Interrupt - shutting down.")
|
|
cancel()
|
|
srv.Shutdown(context.Background())
|
|
os.Exit(1)
|
|
}()
|
|
|
|
http.HandleFunc("/", pageServer)
|
|
http.HandleFunc("/map/", mapServer)
|
|
http.HandleFunc("/img/", imgServer)
|
|
http.HandleFunc("/shutdown/", haltServer)
|
|
http.HandleFunc("/favicon.ico", http.NotFound)
|
|
|
|
log.Printf("Web Rendering Proxy Version %s\n", version)
|
|
log.Printf("Args: %q", os.Args)
|
|
log.Printf("Default Img Type: %v, Geometry: %+v", defType, defGeom)
|
|
|
|
htmlTmpl, err = template.New("wrp.html").Parse(tmpl(tHTML))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
log.Printf("Starting WRP http server on %s\n", addr)
|
|
srv.Addr = addr
|
|
err = srv.ListenAndServe()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|