mirror of
https://github.com/tenox7/wrp.git
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264 lines
7.8 KiB
Go
264 lines
7.8 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 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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"flag"
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"fmt"
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"image/gif"
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"image/png"
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"log"
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"math/rand"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/chromedp/cdproto/emulation"
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"github.com/chromedp/cdproto/runtime"
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"github.com/chromedp/chromedp"
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"github.com/ericpauley/go-quantize/quantize"
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)
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var (
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version = "3.0"
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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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gifmap = make(map[string]bytes.Buffer)
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ismap = make(map[string]Params)
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)
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// Params - Page Configuration Parameters
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type Params struct {
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U string // url
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P int64 // page
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W int64 // width
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H int64 // height
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S float64 // scale
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C int64 // #colors
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}
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func (p *Params) parseForm(req *http.Request) {
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req.ParseForm()
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p.U = req.FormValue("url")
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if len(p.U) > 1 && !strings.HasPrefix(p.U, "http") {
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p.U = fmt.Sprintf("http://www.google.com/search?q=%s", url.QueryEscape(p.U))
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}
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p.P, _ = strconv.ParseInt(req.FormValue("p"), 10, 64)
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if req.FormValue("pg") == "Dn" {
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p.P++
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} else if req.FormValue("pg") == "Up" {
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p.P--
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} else {
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p.P = 0
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}
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p.W, _ = strconv.ParseInt(req.FormValue("w"), 10, 64)
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if p.W < 10 {
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p.W = 1024
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}
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p.H, _ = strconv.ParseInt(req.FormValue("h"), 10, 64)
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if p.H < 10 {
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p.H = 768
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}
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p.S, _ = strconv.ParseFloat(req.FormValue("s"), 64)
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if p.S < 0.1 {
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p.S = 1.0
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}
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p.C, _ = strconv.ParseInt(req.FormValue("c"), 10, 64)
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if p.C < 2 || p.C > 256 {
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p.C = 256
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}
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log.Printf("Params from Form: %+v\n", p)
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}
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func (p Params) printPage(out http.ResponseWriter) {
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out.Header().Set("Content-Type", "text/html")
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fmt.Fprintf(out, "<!-- Web Rendering Proxy Version %s -->\n", version)
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fmt.Fprintf(out, "<HTML>\n<HEAD><TITLE>WRP %s</TITLE></HEAD>\n<BODY BGCOLOR=\"#F0F0F0\">\n", p.U)
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fmt.Fprintf(out, "<FORM ACTION=\"/\"><INPUT TYPE=\"TEXT\" NAME=\"url\" VALUE=\"%s\" SIZE=\"20\">", p.U)
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" VALUE=\"Go\"> \n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"pg\" VALUE=\"Up\"> \n")
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fmt.Fprintf(out, "<INPUT TYPE=\"TEXT\" NAME=\"p\" VALUE=\"%d\" SIZE=\"2\"> \n", p.P)
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"pg\" VALUE=\"Dn\"> \n")
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fmt.Fprintf(out, "W <INPUT TYPE=\"TEXT\" NAME=\"w\" VALUE=\"%d\" SIZE=\"4\"> \n", p.W)
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fmt.Fprintf(out, "H <INPUT TYPE=\"TEXT\" NAME=\"h\" VALUE=\"%d\" SIZE=\"4\"> \n", p.H)
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fmt.Fprintf(out, "S <INPUT TYPE=\"TEXT\" NAME=\"s\" VALUE=\"%1.2f\" SIZE=\"3\"> \n", p.S)
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fmt.Fprintf(out, "C <INPUT TYPE=\"TEXT\" NAME=\"c\" VALUE=\"%d\" SIZE=\"3\"> \n", p.C)
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fmt.Fprintf(out, "</FORM><BR>\n")
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}
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func (p Params) printFooter(out http.ResponseWriter) {
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fmt.Fprintf(out, "\n<P><A HREF=\"/?url=https://github.com/tenox7/wrp/&w=%d&h=%d&s=%1.2f&c=%d\">"+
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"Web Rendering Proxy Version %s</A> | <A HREF=\"/shutdown/\">Shutdown WRP</A></BODY>\n</HTML>\n", p.W, p.H, p.S, p.C, version)
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}
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func pageServer(out http.ResponseWriter, req *http.Request) {
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log.Printf("%s Page Request for %s [%+v]\n", req.RemoteAddr, req.URL.Path, req.URL.RawQuery)
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var p Params
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p.parseForm(req)
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p.printPage(out)
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if len(p.U) > 4 {
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p.capture(req.RemoteAddr, out)
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}
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p.printFooter(out)
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}
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func mapServer(out http.ResponseWriter, req *http.Request) {
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log.Printf("%s ISMAP Request for %s [%+v]\n", req.RemoteAddr, req.URL.Path, req.URL.RawQuery)
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var x, y int64
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n, err := fmt.Sscanf(req.URL.RawQuery, "%d,%d", &x, &y)
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if err != nil || n != 2 {
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fmt.Fprintf(out, "n=%d, err=%s\n", n, err)
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log.Printf("%s ISMAP n=%d, err=%s\n", req.RemoteAddr, n, err)
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return
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}
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p, ok := ismap[req.URL.Path]
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if !ok {
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fmt.Fprintf(out, "Unable to find map %s\n", req.URL.Path)
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log.Printf("Unable to find map %s\n", req.URL.Path)
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return
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}
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defer delete(ismap, req.URL.Path)
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log.Printf("%s Params from ISMAP: %+v\n", req.RemoteAddr, p)
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p.printPage(out)
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if len(p.U) > 4 {
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p.capture(req.RemoteAddr, out)
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}
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p.printFooter(out)
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}
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func imgServer(out http.ResponseWriter, req *http.Request) {
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log.Printf("%s IMG Request for %s\n", req.RemoteAddr, req.URL.Path)
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gifbuf, ok := gifmap[req.URL.Path]
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if !ok || gifbuf.Bytes() == nil {
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fmt.Fprintf(out, "Unable to find image %s\n", req.URL.Path)
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log.Printf("Unable to find image %s\n", req.URL.Path)
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return
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}
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defer delete(gifmap, req.URL.Path)
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out.Header().Set("Content-Type", "image/gif")
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out.Header().Set("Content-Length", strconv.Itoa(len(gifbuf.Bytes())))
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out.Write(gifbuf.Bytes())
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out.(http.Flusher).Flush()
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}
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func (p Params) capture(c string, out http.ResponseWriter) {
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var pngbuf []byte
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var gifbuf bytes.Buffer
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var loc string
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var res *runtime.RemoteObject
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log.Printf("%s Processing Capture Request for %s\n", c, p.U)
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// Run ChromeDP Magic
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err := chromedp.Run(ctx,
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emulation.SetDeviceMetricsOverride(int64(float64(p.W)/p.S), int64(float64(p.H)/p.S), p.S, false),
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chromedp.Navigate(p.U),
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chromedp.Evaluate(fmt.Sprintf("window.scrollTo(0, %d);", p.P*int64(float64(p.H)*float64(0.9))), &res),
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chromedp.Sleep(time.Second*1),
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chromedp.Location(&loc))
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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", c)
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fmt.Fprintf(out, "<BR>%s<BR> -- restarting, try again", err)
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ctx, cancel = chromedp.NewContext(context.Background())
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} else {
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log.Printf("%s %s", c, err)
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fmt.Fprintf(out, "<BR>%s<BR>", err)
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}
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return
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}
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log.Printf("%s Landed on: %s\n", c, loc)
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p.U = loc
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// Process Screenshot Image
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err = chromedp.Run(ctx, chromedp.CaptureScreenshot(&pngbuf))
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if err != nil {
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log.Printf("%s Failed to capture screenshot: %s\n", c, err)
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fmt.Fprintf(out, "<BR>Unable to capture screenshot:<BR>%s<BR>\n", err)
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return
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}
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bytes.NewReader(pngbuf).Seek(0, 0)
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img, err := png.Decode(bytes.NewReader(pngbuf))
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if err != nil {
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log.Printf("%s Failed to decode screenshot: %s\n", c, err)
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fmt.Fprintf(out, "<BR>Unable to decode page screenshot:<BR>%s<BR>\n", err)
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return
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}
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gifbuf.Reset()
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err = gif.Encode(&gifbuf, img, &gif.Options{NumColors: int(p.C), Quantizer: quantize.MedianCutQuantizer{}})
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if err != nil {
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log.Printf("%s Failed to encode GIF: %s\n", c, err)
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fmt.Fprintf(out, "<BR>Unable to encode GIF:<BR>%s<BR>\n", err)
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return
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}
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// Compose map and gif
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seq := rand.Intn(9999)
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imgpath := fmt.Sprintf("/img/%04d.gif", seq)
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mappath := fmt.Sprintf("/map/%04d.map", seq)
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gifmap[imgpath] = gifbuf
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ismap[mappath] = p
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log.Printf("%s Encoded GIF image: %s, Size: %dKB, Colors: %d\n", c, imgpath, len(gifbuf.Bytes())/1024, p.C)
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fmt.Fprintf(out, "<A HREF=\"%s\"><IMG SRC=\"%s\" ALT=\"wrp\" BORDER=\"0\" ISMAP></A>", mappath, imgpath)
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log.Printf("%s Done with caputure for %s\n", c, p.U)
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}
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func haltServer(out http.ResponseWriter, req *http.Request) {
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log.Printf("%s Shutdown Request for %s\n", req.RemoteAddr, req.URL.Path)
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defer cancel()
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srv.Shutdown(context.Background())
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}
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func main() {
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var addr string
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var head, headless bool
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var debug bool
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flag.StringVar(&addr, "l", ":8080", "Listen address:port, default :8080")
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flag.BoolVar(&head, "h", false, "Headed mode - display browser window")
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flag.BoolVar(&debug, "d", false, "Debug ChromeDP")
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flag.Parse()
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if head {
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headless = false
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} else {
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headless = true
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}
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opts := append(chromedp.DefaultExecAllocatorOptions[:],
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chromedp.Flag("headless", headless),
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)
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actx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
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defer cancel()
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if debug {
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ctx, cancel = chromedp.NewContext(actx, chromedp.WithDebugf(log.Printf))
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} else {
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ctx, cancel = chromedp.NewContext(actx)
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}
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defer cancel()
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rand.Seed(time.Now().UnixNano())
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http.HandleFunc("/", pageServer)
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http.HandleFunc("/map/", mapServer)
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http.HandleFunc("/img/", imgServer)
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http.HandleFunc("/shutdown/", haltServer)
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http.HandleFunc("/favicon.ico", http.NotFound)
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log.Printf("Web Rendering Proxy Version %s\n", version)
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log.Printf("Starting WRP http server on %s\n", addr)
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srv.Addr = addr
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err := srv.ListenAndServe()
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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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