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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2019-06-06 07:15:36 +00:00
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"image"
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"image/color/palette"
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"image/draw"
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2019-05-30 06:49:39 +00:00
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"image/gif"
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"image/png"
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"log"
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2019-05-30 09:03:17 +00:00
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"math/rand"
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2019-05-29 08:52:28 +00:00
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"net/http"
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2019-05-30 06:49:39 +00:00
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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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2019-05-29 08:29:01 +00:00
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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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2019-05-31 07:19:10 +00:00
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"github.com/chromedp/cdproto/runtime"
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2019-05-29 09:39:06 +00:00
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2019-05-29 08:52:28 +00:00
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"github.com/chromedp/cdproto/cdp"
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"github.com/chromedp/cdproto/dom"
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"github.com/chromedp/chromedp"
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2019-05-29 08:29:01 +00:00
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)
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2019-06-02 09:25:18 +00:00
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// Ismap for server side processing
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type Ismap struct {
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xmin int64
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ymin int64
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xmax int64
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ymax int64
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url string
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}
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2019-05-29 08:29:01 +00:00
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var (
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version = "3.0"
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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][]Ismap)
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)
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2019-06-02 23:05:36 +00:00
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func pageServer(out http.ResponseWriter, req *http.Request) {
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req.ParseForm()
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u := req.FormValue("url")
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var istr string
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var ion string
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var i bool
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if req.FormValue("i") == "on" {
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istr = "CHECKED"
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i = true
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ion = "&i=on"
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} else {
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istr = ""
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i = false
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}
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p, _ := strconv.ParseInt(req.FormValue("p"), 10, 64)
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if req.FormValue("pg") == "Dn" {
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p++
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} else if req.FormValue("pg") == "Up" {
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p--
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2019-06-01 00:49:14 +00:00
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} else {
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p = 0
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}
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w, _ := strconv.ParseInt(req.FormValue("w"), 10, 64)
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if w < 10 {
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w = 1024
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}
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h, _ := strconv.ParseInt(req.FormValue("h"), 10, 64)
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if h < 10 {
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h = 768
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}
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s, _ := strconv.ParseFloat(req.FormValue("s"), 64)
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if s < 0.1 {
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s = 1.0
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}
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2019-06-03 00:06:41 +00:00
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c, _ := strconv.ParseInt(req.FormValue("c"), 10, 64)
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if c < 2 || c > 256 {
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c = 256
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}
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2019-06-02 23:05:36 +00:00
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log.Printf("%s Page Reqest for url=\"%s\" [%s]\n", req.RemoteAddr, u, req.URL.Path)
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2019-05-29 08:52:28 +00:00
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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", u)
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2019-06-04 08:20:41 +00:00
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fmt.Fprintf(out, "<FORM ACTION=\"/\"><INPUT TYPE=\"TEXT\" NAME=\"url\" VALUE=\"%s\" SIZE=\"20\">", 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)
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"pg\" VALUE=\"Dn\"> \n")
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fmt.Fprintf(out, "I <INPUT TYPE=\"CHECKBOX\" NAME=\"i\" %s> \n", istr)
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fmt.Fprintf(out, "W <INPUT TYPE=\"TEXT\" NAME=\"w\" VALUE=\"%d\" SIZE=\"4\"> \n", w)
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fmt.Fprintf(out, "H <INPUT TYPE=\"TEXT\" NAME=\"h\" VALUE=\"%d\" SIZE=\"4\"> \n", h)
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fmt.Fprintf(out, "S <INPUT TYPE=\"TEXT\" NAME=\"s\" VALUE=\"%1.2f\" SIZE=\"3\"> \n", s)
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//fmt.Fprintf(out, "C <INPUT TYPE=\"TEXT\" NAME=\"c\" VALUE=\"%d\" SIZE=\"3\"> \n", c)
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fmt.Fprintf(out, "</FORM><BR>\n")
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2019-06-04 07:58:45 +00:00
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if len(u) > 1 {
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if strings.HasPrefix(u, "http") {
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capture(u, w, h, s, int(c), p, i, req.RemoteAddr, out)
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} else {
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capture(fmt.Sprintf("http://www.google.com/search?q=%s", url.QueryEscape(u)), w, h, s, int(c), p, i, req.RemoteAddr, out)
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}
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} else {
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fmt.Fprintf(out, "No URL or search query specified")
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}
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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%s\">Web Rendering Proxy Version %s</A></BODY>\n</HTML>\n", w, h, s, c, ion, version)
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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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2019-05-30 09:03:17 +00:00
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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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out.(http.Flusher).Flush()
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}
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2019-06-01 01:20:55 +00:00
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func mapServer(out http.ResponseWriter, req *http.Request) {
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2019-06-02 22:55:58 +00:00
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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 loc string
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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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2019-06-02 23:05:36 +00:00
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log.Printf("%s ISMAP n=%d, err=%s\n", req.RemoteAddr, n, err)
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2019-06-02 22:55:58 +00:00
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return
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}
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2019-06-03 05:23:41 +00:00
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is, ok := ismap[req.URL.Path]
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if !ok || is == nil {
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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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2019-06-02 22:55:58 +00:00
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defer delete(ismap, req.URL.Path)
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for _, i := range is {
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if x >= i.xmin && x <= i.xmax && y >= i.ymin && y <= i.ymax {
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loc = i.url
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}
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}
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if len(loc) < 1 {
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loc = is[0].url
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}
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2019-06-04 07:58:45 +00:00
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log.Printf("%s ISMAP Redirect to: http://%s%s\n", req.RemoteAddr, req.Context().Value(http.LocalAddrContextKey), loc)
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http.Redirect(out, req, fmt.Sprintf("http://%s%s", req.Context().Value(http.LocalAddrContextKey), loc), 301)
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2019-06-01 01:20:55 +00:00
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}
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2019-06-03 00:06:41 +00:00
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func capture(gourl string, w int64, h int64, s float64, co int, p int64, i bool, c string, out http.ResponseWriter) {
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2019-05-29 08:52:28 +00:00
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var nodes []*cdp.Node
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ctxx := chromedp.FromContext(ctx)
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2019-05-30 09:03:17 +00:00
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var pngbuf []byte
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var gifbuf bytes.Buffer
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2019-05-30 01:48:07 +00:00
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var loc string
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2019-05-31 07:19:10 +00:00
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var res *runtime.RemoteObject
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2019-06-02 09:25:18 +00:00
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is := make([]Ismap, 0)
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2019-06-02 23:18:53 +00:00
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var ion string
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2019-05-29 08:29:01 +00:00
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2019-06-02 23:05:36 +00:00
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log.Printf("%s Processing Caputure Request for %s\n", c, gourl)
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2019-05-29 09:39:06 +00:00
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2019-05-30 09:03:17 +00:00
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// Run ChromeDP Magic
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2019-05-31 07:41:46 +00:00
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err := chromedp.Run(ctx,
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2019-06-04 08:30:00 +00:00
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emulation.SetDeviceMetricsOverride(int64(float64(w)/s), int64(float64(h)/s), s, false),
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2019-05-30 01:48:07 +00:00
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chromedp.Navigate(gourl),
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2019-05-31 23:41:25 +00:00
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chromedp.Evaluate(fmt.Sprintf("window.scrollTo(0, %d);", p*int64(float64(h)*float64(0.9))), &res),
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2019-05-31 07:19:10 +00:00
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chromedp.Sleep(time.Second*1),
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chromedp.CaptureScreenshot(&pngbuf),
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2019-05-30 01:48:07 +00:00
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chromedp.Location(&loc),
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2019-05-29 08:52:28 +00:00
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chromedp.Nodes("a", &nodes, chromedp.ByQueryAll))
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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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2019-06-02 23:05:36 +00:00
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log.Printf("%s %s", c, err)
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2019-05-31 07:41:46 +00:00
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fmt.Fprintf(out, "<BR>%s<BR>", err)
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return
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}
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2019-06-02 23:05:36 +00:00
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log.Printf("%s Landed on: %s, Nodes: %d\n", c, loc, len(nodes))
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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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2019-05-30 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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2019-06-06 07:15:36 +00:00
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pm := image.NewPaletted(img.Bounds(), palette.WebSafe)
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draw.FloydSteinberg.Draw(pm, img.Bounds(), img, image.ZP)
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2019-05-30 01:48:07 +00:00
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gifbuf.Reset()
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2019-06-06 07:15:36 +00:00
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err = gif.Encode(&gifbuf, img, nil)
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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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2019-06-02 09:25:18 +00:00
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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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2019-06-02 23:05:36 +00:00
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log.Printf("%s Encoded GIF image: %s, Size: %dKB\n", c, imgpath, len(gifbuf.Bytes())/1024)
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2019-05-30 09:03:17 +00:00
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gifmap[imgpath] = gifbuf
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2019-05-30 01:02:29 +00:00
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2019-05-30 09:03:17 +00:00
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// Process Nodes
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2019-05-30 01:48:07 +00:00
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base, _ := url.Parse(loc)
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2019-06-02 09:25:18 +00:00
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if i {
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2019-06-03 00:07:31 +00:00
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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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2019-06-03 00:06:41 +00:00
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is = append(is, Ismap{xmin: -1, xmax: -1, ymin: -1, ymax: -1, url: fmt.Sprintf("/?url=%s&w=%d&h=%d&s=%1.2f&c=%d&i=on", loc, w, h, s, co)})
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2019-06-02 23:18:53 +00:00
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ion = "&i=on"
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2019-06-01 01:20:55 +00:00
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} else {
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2019-06-03 00:07:31 +00:00
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fmt.Fprintf(out, "<IMG SRC=\"%s\" ALT=\"wrp\" BORDER=\"0\" USEMAP=\"#map\">\n<MAP NAME=\"map\">\n", imgpath)
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2019-06-01 01:20:55 +00:00
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}
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2019-05-29 08:29:01 +00:00
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2019-05-29 08:52:28 +00:00
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for _, n := range nodes {
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b, err := dom.GetBoxModel().WithNodeID(n.NodeID).Do(cdp.WithExecutor(ctx, ctxx.Target))
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2019-05-30 01:48:07 +00:00
|
|
|
if err != nil {
|
|
|
|
|
continue
|
|
|
|
|
}
|
|
|
|
|
tgt, err := base.Parse(n.AttributeValue("href"))
|
|
|
|
|
if err != nil {
|
|
|
|
|
continue
|
2019-05-29 08:52:28 +00:00
|
|
|
}
|
2019-06-03 00:06:41 +00:00
|
|
|
target := fmt.Sprintf("/?url=%s&w=%d&h=%d&s=%1.2f&c=%d%s", tgt, w, h, s, co, ion) // no page# here
|
2019-05-29 08:29:01 +00:00
|
|
|
|
2019-05-30 01:48:07 +00:00
|
|
|
if len(b.Content) > 6 && len(target) > 7 {
|
2019-06-02 09:25:18 +00:00
|
|
|
if i {
|
|
|
|
|
is = append(is, Ismap{
|
|
|
|
|
xmin: int64(b.Content[0] * s), ymin: int64(b.Content[1] * s),
|
|
|
|
|
xmax: int64(b.Content[4] * s), ymax: int64(b.Content[5] * s),
|
|
|
|
|
url: target})
|
2019-06-01 01:20:55 +00:00
|
|
|
} else {
|
2019-06-01 08:17:50 +00:00
|
|
|
fmt.Fprintf(out, "<AREA SHAPE=\"RECT\" COORDS=\"%.f,%.f,%.f,%.f\" ALT=\"%s\" TITLE=\"%s\" HREF=\"%s\">\n",
|
|
|
|
|
b.Content[0]*s, b.Content[1]*s, b.Content[4]*s, b.Content[5]*s, n.AttributeValue("href"), n.AttributeValue("href"), target)
|
2019-06-01 01:20:55 +00:00
|
|
|
}
|
2019-05-29 08:52:28 +00:00
|
|
|
}
|
|
|
|
|
}
|
2019-05-29 08:29:01 +00:00
|
|
|
|
2019-06-02 23:05:36 +00:00
|
|
|
if i {
|
|
|
|
|
log.Printf("%s Encoded ISMAP %s\n", c, mappath)
|
|
|
|
|
} else {
|
2019-06-01 01:20:55 +00:00
|
|
|
fmt.Fprintf(out, "</MAP>\n")
|
|
|
|
|
}
|
2019-06-06 07:15:57 +00:00
|
|
|
ismap[mappath] = is
|
2019-05-30 09:03:17 +00:00
|
|
|
out.(http.Flusher).Flush()
|
2019-06-02 23:05:36 +00:00
|
|
|
log.Printf("%s Done with caputure for %s\n", c, gourl)
|
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),
|
2019-06-04 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)
|
2019-05-30 09:03:17 +00:00
|
|
|
http.HandleFunc("/img/", imgServer)
|
2019-06-01 01:20:55 +00:00
|
|
|
http.HandleFunc("/map/", mapServer)
|
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)
|
2019-05-29 08:52:28 +00:00
|
|
|
http.ListenAndServe(addr, nil)
|
2019-05-29 08:29:01 +00:00
|
|
|
}
|
