2019-05-30 01:53:05 +00:00
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//
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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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2019-05-29 08:29:01 +00:00
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package main
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import (
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2019-05-30 06:49:39 +00:00
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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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2019-05-31 07:36:53 +00:00
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"strings"
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"time"
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2019-05-29 09:39:06 +00:00
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"github.com/chromedp/cdproto/emulation"
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"github.com/chromedp/chromedp"
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"github.com/ericpauley/go-quantize/quantize"
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2019-05-29 08:29:01 +00:00
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)
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var (
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version = "4.2"
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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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2019-06-02 23:19:08 +00:00
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gifmap = make(map[string]bytes.Buffer)
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ismap = make(map[string]wrpReq)
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)
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type wrpReq struct {
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U string // url
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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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X int64 // mouseX
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Y int64 // mouseY
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K string // keys to send
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F string // Fn buttons
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}
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func (w *wrpReq) parseForm(req *http.Request) {
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req.ParseForm()
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w.U = req.FormValue("url")
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if len(w.U) > 1 && !strings.HasPrefix(w.U, "http") {
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w.U = fmt.Sprintf("http://www.google.com/search?q=%s", url.QueryEscape(w.U))
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}
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w.W, _ = strconv.ParseInt(req.FormValue("w"), 10, 64)
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if w.W < 10 {
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w.W = 1152
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}
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w.H, _ = strconv.ParseInt(req.FormValue("h"), 10, 64)
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if w.H < 10 {
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w.H = 600
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}
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w.S, _ = strconv.ParseFloat(req.FormValue("s"), 64)
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if w.S < 0.1 {
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w.S = 1.0
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}
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w.C, _ = strconv.ParseInt(req.FormValue("c"), 10, 64)
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if w.C < 2 || w.C > 256 {
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w.C = 256
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}
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w.K = req.FormValue("k")
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w.F = req.FormValue("Fn")
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log.Printf("WrpReq from Form: %+v\n", w)
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}
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func (w wrpReq) printPage(out http.ResponseWriter) {
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out.Header().Set("Content-Type", "text/html")
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2019-06-02 23:24:46 +00:00
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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", w.U)
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fmt.Fprintf(out, "<FORM ACTION=\"/\" METHOD=\"POST\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"TEXT\" NAME=\"url\" VALUE=\"%s\" SIZE=\"10\">", w.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=\"Fn\" VALUE=\"Bk\">\n")
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fmt.Fprintf(out, "W <INPUT TYPE=\"TEXT\" NAME=\"w\" VALUE=\"%d\" SIZE=\"4\"> \n", w.W)
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fmt.Fprintf(out, "H <INPUT TYPE=\"TEXT\" NAME=\"h\" VALUE=\"%d\" SIZE=\"4\"> \n", w.H)
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fmt.Fprintf(out, "S <INPUT TYPE=\"TEXT\" NAME=\"s\" VALUE=\"%1.2f\" SIZE=\"3\"> \n", w.S)
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fmt.Fprintf(out, "C <INPUT TYPE=\"TEXT\" NAME=\"c\" VALUE=\"%d\" SIZE=\"3\">\n", w.C)
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fmt.Fprintf(out, "K <INPUT TYPE=\"TEXT\" NAME=\"k\" VALUE=\"\" SIZE=\"4\"> \n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\"Bs\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\"Rt\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\"<\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\"^\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\"v\">\n")
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"Fn\" VALUE=\">\" SIZE=\"1\">\n")
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fmt.Fprintf(out, "</FORM><BR>\n")
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}
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2019-07-11 06:58:40 +00:00
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func (w wrpReq) 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", w.W, w.H, w.S, w.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 w wrpReq
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w.parseForm(req)
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if len(w.U) > 4 {
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w.capture(req.RemoteAddr, out)
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} else {
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w.printPage(out)
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w.printFooter(out)
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}
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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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w, 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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n, err := fmt.Sscanf(req.URL.RawQuery, "%d,%d", &w.X, &w.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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log.Printf("%s WrpReq from ISMAP: %+v\n", req.RemoteAddr, w)
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if len(w.U) > 4 {
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w.capture(req.RemoteAddr, out)
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} else {
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w.printPage(out)
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w.printFooter(out)
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}
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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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2019-06-03 05:23:41 +00:00
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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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2019-05-30 01:02:29 +00:00
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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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2019-05-30 09:03:17 +00:00
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out.(http.Flusher).Flush()
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2019-05-29 08:29:01 +00:00
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}
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2019-07-11 06:58:40 +00:00
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func (w wrpReq) 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 err error
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2019-07-11 06:58:40 +00:00
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if w.X > 0 && w.Y > 0 {
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log.Printf("%s Mouse Click %d,%d\n", c, w.X, w.Y)
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2019-07-13 07:40:56 +00:00
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err = chromedp.Run(ctx, chromedp.MouseClickXY(int64(float64(w.X)/w.S), int64(float64(w.Y)/w.S)))
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} else if len(w.F) > 0 {
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log.Printf("%s Button %v\n", c, w.F)
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switch w.F {
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case "Bk":
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err = chromedp.Run(ctx, chromedp.NavigateBack())
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case "Bs":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\b"))
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case "Rt":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\r"))
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case "<":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\u0302"))
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case "^":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\u0304"))
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case "v":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\u0301"))
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case ">":
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err = chromedp.Run(ctx, chromedp.KeyEvent("\u0303"))
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}
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2019-07-12 08:51:23 +00:00
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} else if len(w.K) > 0 {
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log.Printf("%s Sending Keys: %#v\n", c, w.K)
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2019-07-13 07:42:27 +00:00
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err = chromedp.Run(ctx, chromedp.KeyEvent(w.K))
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2019-07-10 08:01:40 +00:00
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} else {
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2019-07-11 06:58:40 +00:00
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log.Printf("%s Processing Capture Request for %s\n", c, w.U)
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2019-07-10 08:01:40 +00:00
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err = chromedp.Run(ctx,
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emulation.SetDeviceMetricsOverride(int64(float64(w.W)/w.S), int64(float64(w.H)/w.S), w.S, false),
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chromedp.Navigate(w.U),
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2019-07-12 08:51:23 +00:00
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)
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2019-07-10 08:01:40 +00:00
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}
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2019-05-29 08:29:01 +00:00
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2019-05-31 07:41:46 +00:00
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if err != nil {
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2019-06-09 00:32:35 +00:00
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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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2019-06-17 07:21:32 +00:00
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return
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2019-05-31 07:41:46 +00:00
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}
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2019-07-10 08:01:40 +00:00
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2019-07-12 08:51:23 +00:00
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chromedp.Run(
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ctx, chromedp.Sleep(time.Second*3),
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chromedp.Location(&w.U),
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)
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log.Printf("%s Landed on: %s\n", c, w.U)
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2019-07-11 06:58:40 +00:00
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w.printPage(out)
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2019-05-30 01:48:07 +00:00
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2019-05-30 09:03:17 +00:00
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// Process Screenshot Image
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2019-06-24 07:40:34 +00:00
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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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2019-05-30 09:15:52 +00:00
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bytes.NewReader(pngbuf).Seek(0, 0)
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2019-05-30 09:03:17 +00:00
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img, err := png.Decode(bytes.NewReader(pngbuf))
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2019-05-30 01:48:07 +00:00
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if err != nil {
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2019-06-02 23:05:36 +00:00
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log.Printf("%s Failed to decode screenshot: %s\n", c, err)
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2019-05-30 06:49:39 +00:00
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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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2019-05-30 01:48:07 +00:00
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}
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gifbuf.Reset()
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2019-07-11 06:58:40 +00:00
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err = gif.Encode(&gifbuf, img, &gif.Options{NumColors: int(w.C), Quantizer: quantize.MedianCutQuantizer{}})
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2019-05-30 07:53:59 +00:00
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if err != nil {
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2019-06-02 23:05:36 +00:00
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log.Printf("%s Failed to encode GIF: %s\n", c, err)
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2019-05-30 07:53:59 +00:00
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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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2019-05-29 08:29:01 +00:00
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2019-06-26 08:07:13 +00:00
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// Compose map and gif
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|
|
|
|
seq := rand.Intn(9999)
|
|
|
|
|
imgpath := fmt.Sprintf("/img/%04d.gif", seq)
|
|
|
|
|
mappath := fmt.Sprintf("/map/%04d.map", seq)
|
|
|
|
|
gifmap[imgpath] = gifbuf
|
2019-07-11 06:58:40 +00:00
|
|
|
ismap[mappath] = w
|
|
|
|
|
log.Printf("%s Encoded GIF image: %s, Size: %dKB, Colors: %d\n", c, imgpath, len(gifbuf.Bytes())/1024, w.C)
|
2019-06-26 08:07:13 +00:00
|
|
|
fmt.Fprintf(out, "<A HREF=\"%s\"><IMG SRC=\"%s\" ALT=\"wrp\" BORDER=\"0\" ISMAP></A>", mappath, imgpath)
|
2019-07-11 06:58:40 +00:00
|
|
|
w.printFooter(out)
|
|
|
|
|
log.Printf("%s Done with caputure for %s\n", c, w.U)
|
2019-05-29 08:29:01 +00:00
|
|
|
}
|
|
|
|
|
|
2019-06-18 06:53:22 +00:00
|
|
|
func haltServer(out http.ResponseWriter, req *http.Request) {
|
|
|
|
|
log.Printf("%s Shutdown Request for %s\n", req.RemoteAddr, req.URL.Path)
|
|
|
|
|
defer cancel()
|
|
|
|
|
srv.Shutdown(context.Background())
|
|
|
|
|
}
|
|
|
|
|
|
2019-05-29 08:29:01 +00:00
|
|
|
func main() {
|
2019-05-29 08:52:28 +00:00
|
|
|
var addr string
|
2019-06-04 07:58:45 +00:00
|
|
|
var head, headless bool
|
2019-06-04 00:50:16 +00:00
|
|
|
var debug bool
|
2019-05-29 08:52:28 +00:00
|
|
|
flag.StringVar(&addr, "l", ":8080", "Listen address:port, default :8080")
|
2019-06-04 00:50:16 +00:00
|
|
|
flag.BoolVar(&head, "h", false, "Headed mode - display browser window")
|
|
|
|
|
flag.BoolVar(&debug, "d", false, "Debug ChromeDP")
|
2019-05-29 08:52:28 +00:00
|
|
|
flag.Parse()
|
2019-06-04 00:50:16 +00:00
|
|
|
if head {
|
|
|
|
|
headless = false
|
|
|
|
|
} else {
|
|
|
|
|
headless = true
|
|
|
|
|
}
|
|
|
|
|
opts := append(chromedp.DefaultExecAllocatorOptions[:],
|
2019-06-04 07:58:45 +00:00
|
|
|
chromedp.Flag("headless", headless),
|
2019-07-11 06:58:40 +00:00
|
|
|
chromedp.Flag("hide-scrollbars", false),
|
2019-06-04 00:50:16 +00:00
|
|
|
)
|
|
|
|
|
actx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
|
|
|
|
|
defer cancel()
|
|
|
|
|
if debug {
|
2019-06-04 08:23:46 +00:00
|
|
|
ctx, cancel = chromedp.NewContext(actx, chromedp.WithDebugf(log.Printf))
|
2019-06-04 00:50:16 +00:00
|
|
|
} else {
|
2019-06-04 08:23:46 +00:00
|
|
|
ctx, cancel = chromedp.NewContext(actx)
|
2019-06-04 00:50:16 +00:00
|
|
|
}
|
|
|
|
|
defer cancel()
|
2019-05-30 09:03:17 +00:00
|
|
|
rand.Seed(time.Now().UnixNano())
|
2019-05-29 08:52:28 +00:00
|
|
|
http.HandleFunc("/", pageServer)
|
2019-06-26 08:07:13 +00:00
|
|
|
http.HandleFunc("/map/", mapServer)
|
2019-05-30 09:03:17 +00:00
|
|
|
http.HandleFunc("/img/", imgServer)
|
2019-06-18 06:53:22 +00:00
|
|
|
http.HandleFunc("/shutdown/", haltServer)
|
2019-05-30 01:47:03 +00:00
|
|
|
http.HandleFunc("/favicon.ico", http.NotFound)
|
2019-06-02 23:24:46 +00:00
|
|
|
log.Printf("Web Rendering Proxy Version %s\n", version)
|
2019-05-31 06:40:43 +00:00
|
|
|
log.Printf("Starting WRP http server on %s\n", addr)
|
2019-06-18 06:53:22 +00:00
|
|
|
srv.Addr = addr
|
|
|
|
|
err := srv.ListenAndServe()
|
|
|
|
|
if err != nil {
|
|
|
|
|
log.Fatal(err)
|
|
|
|
|
}
|
2019-05-29 08:29:01 +00:00
|
|
|
}
|
