mirror of https://github.com/tenox7/wrp.git
610 lines
17 KiB
Go
610 lines
17 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) 2019-2024 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/jpeg"
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"image/png"
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"io"
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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"
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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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const version = "4.6.0"
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var (
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addr = flag.String("l", ":8080", "Listen address:port, default :8080")
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headless = flag.Bool("h", true, "Headless mode / hide browser window (default true)")
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noDel = flag.Bool("n", false, "Do not free maps and images after use")
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defType = flag.String("t", "gif", "Image type: png|gif|jpg")
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jpgQual = flag.Int("q", 80, "Jpeg image quality, default 80%")
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fgeom = flag.String("g", "1152x600x216", "Geometry: width x height x colors, height can be 0 for unlimited")
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htmFnam = flag.String("ui", "wrp.html", "HTML template file for the UI")
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delay = flag.Duration("s", 2*time.Second, "Delay/sleep after page is rendered and before screenshot is taken")
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userAgent = flag.String("ua", "", "override chrome user agent")
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srv http.Server
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actx, ctx context.Context
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acncl, cncl 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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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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switch rq.imgType {
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case "png":
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case "gif":
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case "jpg":
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default:
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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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// Navigate to the desired URL.
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func (rq *wrpReq) navigate() {
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ctxErr(chromedp.Run(ctx, rq.action()), rq.w)
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}
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// Handle context errors
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func ctxErr(err error, w io.Writer) {
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// TODO: callers should have retry logic, perhaps create another function
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// that takes ...chromedp.Action and retries with give up
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if err == nil {
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return
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}
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log.Printf("Context error: %s", err)
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fmt.Fprintf(w, "Context error: %s<BR>\n", err)
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if err.Error() != "context canceled" {
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return
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}
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ctx, cncl = chromedp.NewContext(actx)
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log.Printf("Created new context, try again")
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fmt.Fprintln(w, "Created new context, try again")
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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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func gifPalette(i image.Image, n int64) image.Image {
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switch n {
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case 2:
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i = halfgone.FloydSteinbergDitherer{}.Apply(halfgone.ImageToGray(i))
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case 216:
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var FastGifLut = [256]int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5}
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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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if i64, ok := i.(image.RGBA64Image); ok {
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for y := r.Min.Y; y < r.Max.Y; y++ {
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for x := r.Min.X; x < r.Max.X; x++ {
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c := i64.RGBA64At(x, y)
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r6 := FastGifLut[c.R>>8]
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g6 := FastGifLut[c.G>>8]
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b6 := FastGifLut[c.B>>8]
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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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for y := r.Min.Y; y < r.Max.Y; y++ {
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for x := r.Min.X; x < r.Max.X; 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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}
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i = p
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default:
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q := median.Quantizer(n)
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i = q.Paletted(i)
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}
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return i
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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 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(*delay), // TODO(tenox): find a better way to determine if page is rendered
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)
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// Capture screenshot...
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ctxErr(chromedp.Run(ctx, chromedpCaptureScreenshot(&pngCap, rq.height)), rq.w)
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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 "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, Res: %dx%d\n", rq.r.RemoteAddr, imgPath, sSize, iW, iH)
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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 PNG screenshot: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to decode page PNG screenshot:<BR>%s<BR>\n", err)
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return
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}
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st := time.Now()
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var gifBuf bytes.Buffer
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err = gif.Encode(&gifBuf, gifPalette(i, rq.colors), &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, Res: %dx%d, Time: %vms\n", rq.r.RemoteAddr, imgPath, sSize, rq.colors, iW, iH, time.Since(st).Milliseconds())
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case "jpg":
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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 PNG screenshot: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to decode page PNG screenshot:<BR>%s<BR>\n", err)
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return
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}
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st := time.Now()
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var jpgBuf bytes.Buffer
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err = jpeg.Encode(&jpgBuf, i, &jpeg.Options{Quality: *jpgQual})
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if err != nil {
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log.Printf("%s Failed to encode JPG: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to encode JPG:<BR>%s<BR>\n", err)
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return
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}
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img[imgPath] = jpgBuf
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sSize = fmt.Sprintf("%.0f KB", float32(len(jpgBuf.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 JPG image: %s, Size: %s, Quality: %d, Res: %dx%d, Time: %vms\n", rq.r.RemoteAddr, imgPath, sSize, *jpgQual, iW, iH, time.Since(st).Milliseconds())
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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() // TODO: if error from navigate do not capture
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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"})
|
|
return
|
|
}
|
|
rq.navigate() // TODO: if error from navigate do not capture
|
|
rq.capture()
|
|
}
|
|
|
|
// Process HTTP requests for images '/img/' url
|
|
func imgServer(w http.ResponseWriter, r *http.Request) {
|
|
log.Printf("%s IMG Request for %s\n", r.RemoteAddr, r.URL.Path)
|
|
imgBuf, ok := img[r.URL.Path]
|
|
if !ok || imgBuf.Bytes() == nil {
|
|
fmt.Fprintf(w, "Unable to find image %s\n", r.URL.Path)
|
|
log.Printf("%s Unable to find image %s\n", r.RemoteAddr, r.URL.Path)
|
|
return
|
|
}
|
|
if !*noDel {
|
|
defer delete(img, r.URL.Path)
|
|
}
|
|
switch {
|
|
case strings.HasPrefix(r.URL.Path, ".gif"):
|
|
w.Header().Set("Content-Type", "image/gif")
|
|
case strings.HasPrefix(r.URL.Path, ".png"):
|
|
w.Header().Set("Content-Type", "image/png")
|
|
case strings.HasPrefix(r.URL.Path, ".jpg"):
|
|
w.Header().Set("Content-Type", "image/jpeg")
|
|
}
|
|
w.Header().Set("Content-Length", strconv.Itoa(len(imgBuf.Bytes())))
|
|
w.Header().Set("Cache-Control", "max-age=0")
|
|
w.Header().Set("Expires", "-1")
|
|
w.Header().Set("Pragma", "no-cache")
|
|
w.Write(imgBuf.Bytes())
|
|
w.(http.Flusher).Flush()
|
|
}
|
|
|
|
// Process HTTP requests for Shutdown via '/shutdown/' url
|
|
func haltServer(w http.ResponseWriter, r *http.Request) {
|
|
log.Printf("%s Shutdown Request for %s\n", r.RemoteAddr, r.URL.Path)
|
|
w.Header().Set("Cache-Control", "max-age=0")
|
|
w.Header().Set("Expires", "-1")
|
|
w.Header().Set("Pragma", "no-cache")
|
|
w.Header().Set("Content-Type", "text/plain")
|
|
fmt.Fprintf(w, "Shutting down WRP...\n")
|
|
w.(http.Flusher).Flush()
|
|
time.Sleep(time.Second * 2)
|
|
cncl()
|
|
acncl()
|
|
srv.Shutdown(context.Background())
|
|
os.Exit(1)
|
|
}
|
|
|
|
// returns html template, either from html file or built-in
|
|
func tmpl(t string) string {
|
|
var tmpl []byte
|
|
fh, err := os.Open(t)
|
|
if err != nil {
|
|
goto builtin
|
|
}
|
|
defer fh.Close()
|
|
|
|
tmpl, err = ioutil.ReadAll(fh)
|
|
if err != nil {
|
|
goto builtin
|
|
}
|
|
log.Printf("Got HTML UI template from %v file, size %v \n", t, len(tmpl))
|
|
return string(tmpl)
|
|
|
|
builtin:
|
|
fhs, err := fs.Open("wrp.html")
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
defer fhs.Close()
|
|
|
|
tmpl, err = ioutil.ReadAll(fhs)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
log.Printf("Got HTML UI template from embed\n")
|
|
return string(tmpl)
|
|
}
|
|
|
|
// Print my own IP addresses
|
|
func printIPs(b string) {
|
|
ap := strings.Split(b, ":")
|
|
if len(ap) < 1 {
|
|
log.Fatal("Wrong format of ipaddress:port")
|
|
}
|
|
log.Printf("Listen address: %v", b)
|
|
if ap[0] != "" && ap[0] != "0.0.0.0" {
|
|
return
|
|
}
|
|
a, err := net.InterfaceAddrs()
|
|
if err != nil {
|
|
log.Print("Unable to get interfaces: ", err)
|
|
return
|
|
}
|
|
var m string
|
|
for _, i := range a {
|
|
n, ok := i.(*net.IPNet)
|
|
if !ok || n.IP.IsLoopback() || strings.Contains(n.IP.String(), ":") {
|
|
continue
|
|
}
|
|
m = m + n.IP.String() + " "
|
|
}
|
|
log.Print("My IP addresses: ", m)
|
|
}
|
|
|
|
// Main
|
|
func main() {
|
|
var err error
|
|
flag.Parse()
|
|
log.Printf("Web Rendering Proxy Version %s\n", version)
|
|
log.Printf("Args: %q", os.Args)
|
|
if len(os.Getenv("PORT")) > 0 {
|
|
*addr = ":" + os.Getenv(("PORT"))
|
|
}
|
|
printIPs(*addr)
|
|
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),
|
|
chromedp.Flag("enable-automation", false),
|
|
chromedp.Flag("disable-blink-features", "AutomationControlled"),
|
|
)
|
|
if *userAgent != "" {
|
|
opts = append(opts, chromedp.UserAgent(*userAgent))
|
|
}
|
|
actx, acncl = chromedp.NewExecAllocator(context.Background(), opts...)
|
|
defer acncl()
|
|
ctx, cncl = chromedp.NewContext(actx)
|
|
defer cncl()
|
|
|
|
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.")
|
|
cncl()
|
|
acncl()
|
|
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("Default Img Type: %v, Geometry: %+v", *defType, defGeom)
|
|
|
|
htmlTmpl, err = template.New("wrp.html").Parse(tmpl(*htmFnam))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
log.Print("Starting WRP http server")
|
|
srv.Addr = *addr
|
|
err = srv.ListenAndServe()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|