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wrp/wrp.go

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add copyright
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//
// WRP - Web Rendering Proxy
//
// Copyright (c) 2013-2018 Antoni Sawicki
// Copyright (c) 2019 Google LLC
//
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package main
import (
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"bytes"
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"context"
"flag"
"fmt"
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_ "image"
"image/gif"
"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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"os"
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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/cdproto/cdp"
"github.com/chromedp/cdproto/dom"
"github.com/chromedp/chromedp"
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)
var (
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ctx context.Context
cancel context.CancelFunc
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gifmap = make(map[string]bytes.Buffer)
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)
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func pageServer(out http.ResponseWriter, r *http.Request) {
r.ParseForm()
u := r.FormValue("url")
ISMAP checkbox
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var istr string
var i bool
if r.FormValue("i") == "on" {
istr = "CHECKED"
i = true
} else {
istr = ""
i = false
}
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p, _ := strconv.ParseInt(r.FormValue("p"), 10, 64)
if r.FormValue("pg") == ">>" {
p++
} else if r.FormValue("pg") == "<<" {
p--
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} else {
p = 0
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}
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w, _ := strconv.ParseInt(r.FormValue("w"), 10, 64)
if w < 10 {
w = 1024
}
h, _ := strconv.ParseInt(r.FormValue("h"), 10, 64)
if h < 10 {
h = 768
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}
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s, _ := strconv.ParseFloat(r.FormValue("s"), 64)
if s < 0.1 {
s = 1.0
}
log.Printf("%s Page Reqest for url=\"%s\" [%s]\n", r.RemoteAddr, u, r.URL.Path)
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out.Header().Set("Content-Type", "text/html")
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fmt.Fprintf(out, "<HTML>\n<HEAD><TITLE>WRP %s</TITLE>\n<BODY BGCOLOR=\"#F0F0F0\">", u)
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fmt.Fprintf(out, "<FORM ACTION=\"/\">URL/Search: <INPUT TYPE=\"TEXT\" NAME=\"url\" VALUE=\"%s\" SIZE=\"40\">", u)
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fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" VALUE=\"Go\"><P>\n")
ISMAP checkbox
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fmt.Fprintf(out, "ISMAP:<INPUT TYPE=\"CHECKBOX\" NAME=\"i\" %s> [%v]\n", istr, i)
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fmt.Fprintf(out, "Width:<INPUT TYPE=\"TEXT\" NAME=\"w\" VALUE=\"%d\" SIZE=\"4\"> \n", w)
fmt.Fprintf(out, "Height:<INPUT TYPE=\"TEXT\" NAME=\"h\" VALUE=\"%d\" SIZE=\"4\"> \n", h)
fmt.Fprintf(out, "Scale:<INPUT TYPE=\"TEXT\" NAME=\"s\" VALUE=\"%1.2f\" SIZE=\"3\"> \n", s)
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fmt.Fprintf(out, "Page:<INPUT TYPE=\"HIDDEN\" NAME=\"p\" VALUE=\"%d\"> \n", p)
fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"pg\" VALUE=\"<<\"> %d \n", p)
fmt.Fprintf(out, "<INPUT TYPE=\"SUBMIT\" NAME=\"pg\" VALUE=\">>\"> \n")
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fmt.Fprintf(out, "</FORM><P>")
if len(u) > 4 {
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if strings.HasPrefix(u, "http") {
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capture(u, w, h, s, p, 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, p, 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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}
fmt.Fprintf(out, "</BODY>\n</HTML>\n")
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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)
gifbuf := gifmap[req.URL.Path]
defer delete(gifmap, req.URL.Path)
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out.Header().Set("Content-Type", "image/gif")
out.Header().Set("Content-Length", strconv.Itoa(len(gifbuf.Bytes())))
out.Write(gifbuf.Bytes())
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out.(http.Flusher).Flush()
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}
shutdown function via /halt url
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func haltServer(out http.ResponseWriter, req *http.Request) {
log.Printf("%s Shutdown request received [%s]\n", req.RemoteAddr, req.URL.Path)
out.Header().Set("Content-Type", "text/plain")
fmt.Fprintf(out, "WRP Shutdown")
out.(http.Flusher).Flush()
cancel()
os.Exit(0)
}
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func capture(gourl string, w int64, h int64, s float64, p int64, out http.ResponseWriter) {
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var nodes []*cdp.Node
ctxx := chromedp.FromContext(ctx)
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var pngbuf []byte
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("Processing Caputure Request for %s\n", gourl)
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randomized image url
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// Run ChromeDP Magic
chromedp.run error handling
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err := chromedp.Run(ctx,
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emulation.SetDeviceMetricsOverride(w, h, s, false),
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chromedp.Navigate(gourl),
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chromedp.Evaluate(fmt.Sprintf("window.scrollTo(0, %d);", p*int64(float64(h)*float64(0.9))), &res),
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chromedp.Sleep(time.Second*1),
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chromedp.CaptureScreenshot(&pngbuf),
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chromedp.Location(&loc),
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chromedp.Nodes("a", &nodes, chromedp.ByQueryAll))
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chromedp.run error handling
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if err != nil {
log.Printf("%s", err)
fmt.Fprintf(out, "<BR>%s<BR>", err)
return
}
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log.Printf("Landed on: %s, Nodes: %d\n", loc, len(nodes))
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randomized image url
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// Process Screenshot Image
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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("Failed to decode screenshot: %s\n", err)
fmt.Fprintf(out, "<BR>Unable to decode page screenshot:<BR>%s<BR>\n", err)
return
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}
gifbuf.Reset()
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err = gif.Encode(&gifbuf, img, nil)
if err != nil {
log.Printf("Failed to encode GIF: %s\n", err)
fmt.Fprintf(out, "<BR>Unable to encode GIF:<BR>%s<BR>\n", err)
return
}
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imgpath := fmt.Sprintf("/img/%04d.gif", rand.Intn(9999))
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log.Printf("Encoded GIF image: %s, Size: %dKB\n", imgpath, len(gifbuf.Bytes())/1024)
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gifmap[imgpath] = gifbuf
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// Process Nodes
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base, _ := url.Parse(loc)
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fmt.Fprintf(out, "<IMG SRC=\"%s\" ALT=\"wrp\" USEMAP=\"#map\">\n<MAP NAME=\"map\">\n", imgpath)
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for _, n := range nodes {
b, err := dom.GetBoxModel().WithNodeID(n.NodeID).Do(cdp.WithExecutor(ctx, ctxx.Target))
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if err != nil {
continue
}
tgt, err := base.Parse(n.AttributeValue("href"))
if err != nil {
continue
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}
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target := fmt.Sprintf("/?url=%s&w=%d&h=%d&s=%1.2f&", tgt, w, h, s) // no page# here
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if len(b.Content) > 6 && len(target) > 7 {
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fmt.Fprintf(out, "<AREA SHAPE=\"RECT\" COORDS=\"%.f,%.f,%.f,%.f\" ALT=\"%s\" TITLE=\"%s\" HREF=\"%s\">\n",
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b.Content[0]*s, b.Content[1]*s, b.Content[4]*s, b.Content[5]*s, n.AttributeValue("href"), n.AttributeValue("href"), target)
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}
}
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fmt.Fprintf(out, "</MAP>\n")
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out.(http.Flusher).Flush()
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log.Printf("Done with caputure for %s\n", gourl)
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}
func main() {
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ctx, cancel = chromedp.NewContext(context.Background())
defer cancel()
var addr string
flag.StringVar(&addr, "l", ":8080", "Listen address:port, default :8080")
flag.Parse()
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rand.Seed(time.Now().UnixNano())
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http.HandleFunc("/", pageServer)
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http.HandleFunc("/img/", imgServer)
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http.HandleFunc("/favicon.ico", http.NotFound)
shutdown function via /halt url
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http.HandleFunc("/halt", haltServer)
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log.Printf("Starting WRP http server on %s\n", addr)
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http.ListenAndServe(addr, nil)
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}
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