mirror of
https://github.com/tenox7/wrp.git
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437 lines
12 KiB
Go
437 lines
12 KiB
Go
// WRP ISMAP / ChromeDP routines
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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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"fmt"
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"image"
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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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"log"
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"math"
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"net/http"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/chromedp/cdproto/emulation"
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"github.com/chromedp/cdproto/input"
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"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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"github.com/lithammer/shortuuid/v4"
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"github.com/tenox7/gip"
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)
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type cachedImg struct {
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buf bytes.Buffer
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}
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type cachedMap struct {
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req wrpReq
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}
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type wrpCache struct {
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sync.Mutex
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imgs map[string]cachedImg
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maps map[string]cachedMap
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}
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func (c *wrpCache) addImg(path string, buf bytes.Buffer) {
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c.Lock()
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defer c.Unlock()
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c.imgs[path] = cachedImg{buf: buf}
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}
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func (c *wrpCache) getImg(path string) (bytes.Buffer, bool) {
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c.Lock()
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defer c.Unlock()
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e, ok := c.imgs[path]
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if !ok {
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return bytes.Buffer{}, false
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}
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return e.buf, true
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}
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func (c *wrpCache) addMap(path string, req wrpReq) {
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c.Lock()
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defer c.Unlock()
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c.maps[path] = cachedMap{req: req}
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}
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func (c *wrpCache) getMap(path string) (wrpReq, bool) {
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c.Lock()
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defer c.Unlock()
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e, ok := c.maps[path]
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if !ok {
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return wrpReq{}, false
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}
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return e.req, true
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}
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func (c *wrpCache) clear() {
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c.Lock()
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defer c.Unlock()
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c.imgs = make(map[string]cachedImg)
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c.maps = make(map[string]cachedMap)
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}
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func chromedpStart() (context.CancelFunc, context.CancelFunc) {
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opts := append(chromedp.DefaultExecAllocatorOptions[:],
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chromedp.Flag("headless", *headless),
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chromedp.Flag("hide-scrollbars", false),
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chromedp.Flag("enable-automation", false),
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chromedp.Flag("disable-blink-features", "AutomationControlled"),
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)
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if *userAgent == "jnrbsn" {
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if ua := fetchJnrbsnUserAgent(); ua != "" {
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*userAgent = ua
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}
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}
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if *userAgent != "" {
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opts = append(opts, chromedp.UserAgent(*userAgent))
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}
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if *browserPath == "" {
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*browserPath = findBrowser()
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}
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if *browserPath != "" {
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log.Printf("Using browser: %s", *browserPath)
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opts = append(opts, chromedp.ExecPath(*browserPath))
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} else {
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log.Printf("No browser detected, falling back to chromedp default lookup")
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}
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if *userDataDir != "" {
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opts = append(opts, chromedp.UserDataDir(*userDataDir))
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}
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actx, acncl = chromedp.NewExecAllocator(context.Background(), opts...)
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ctx, cncl = chromedp.NewContext(actx)
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return cncl, acncl
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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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case "Up":
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return chromedp.KeyEvent("\u0308")
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case "Dn":
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return chromedp.KeyEvent("\u0307")
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case "All": // Select all
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return chromedp.KeyEvent("a", chromedp.KeyModifiers(input.ModifierCtrl))
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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 Navigate 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, returns the downloaded file if one was triggered.
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func (rq *wrpReq) navigate() *dlFile {
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resetDownloadState()
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ctxErr(chromedp.Run(ctx, rq.action()), rq.w)
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return waitForDownload()
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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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setupDownloads()
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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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func waitForRender() chromedp.ActionFunc {
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return func(ctx context.Context) error {
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timeout := *delay
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if timeout > 5*time.Second {
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timeout = 5 * time.Second
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}
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ch := make(chan struct{}, 1)
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lctx, lcancel := context.WithCancel(ctx)
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defer lcancel()
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chromedp.ListenTarget(lctx, func(ev interface{}) {
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if e, ok := ev.(*page.EventLifecycleEvent); ok && e.Name == "networkAlmostIdle" {
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select {
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case ch <- struct{}{}:
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default:
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}
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}
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})
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deadline := time.Now().Add(timeout)
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for time.Now().Before(deadline) {
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select {
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case <-ch:
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return nil
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default:
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}
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var ready bool
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if err := chromedp.Evaluate(
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`document.readyState === "complete" && Array.from(document.images).every(i => i.complete)`,
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&ready,
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).Do(ctx); err != nil {
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return nil
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}
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if ready {
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return nil
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}
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time.Sleep(100 * time.Millisecond)
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}
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return nil
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}
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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") // TODO: do not panic here, return error
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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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// Capture Screenshot using CDP
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func (rq *wrpReq) captureScreenshot() {
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wrpCach.clear()
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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.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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if rq.proxy {
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rq.url = strings.Replace(rq.url, "https://", "http://", 1)
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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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waitForRender(),
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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 := shortuuid.New()
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var imgExt string
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if rq.imgType == "gip" {
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imgExt = "gif"
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} else {
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imgExt = rq.imgType
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}
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imgPath := fmt.Sprintf("/img/%s.%s", seq, imgExt)
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mapPath := fmt.Sprintf("/map/%s.map", seq)
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wrpCach.addMap(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 "gip":
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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 gipBuf bytes.Buffer
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err = gip.Encode(&gipBuf, i, nil)
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if err != nil {
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log.Printf("%s Failed to encode GIP: %s\n", rq.r.RemoteAddr, err)
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fmt.Fprintf(rq.w, "<BR>Unable to encode GIP:<BR>%s<BR>\n", err)
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return
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}
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wrpCach.addImg(imgPath, gipBuf)
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sSize = fmt.Sprintf("%.0f KB", float32(len(gipBuf.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 GIP image: %s, Size: %s, Res: %dx%d, Time: %vms\n", rq.r.RemoteAddr, imgPath, sSize, iW, iH, time.Since(st).Milliseconds())
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case "png":
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pngBuf := bytes.NewBuffer(pngCap)
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wrpCach.addImg(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.nColors), &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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wrpCach.addImg(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.nColors, 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: int(rq.jQual)})
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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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wrpCach.addImg(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, *defJpgQual, iW, iH, time.Since(st).Milliseconds())
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}
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if rq.proxy {
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rq.w.Header().Set("Content-Type", "text/html")
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fmt.Fprintf(rq.w, "<HTML><HEAD>%s<TITLE>%s</TITLE></HEAD><BODY BGCOLOR=\"%s\">"+
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"<A HREF=\"%s\"><IMG SRC=\"%s\" BORDER=\"0\" WIDTH=\"%d\" HEIGHT=\"%d\" ISMAP></A>"+
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"</BODY></HTML>", rq.baseTag(), rq.url, *bgColor, mapPath, imgPath, iW, iH)
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} else {
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rq.printUI(uiParams{
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bgColor: *bgColor,
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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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}
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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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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 := wrpCach.getMap(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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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.printUI(uiParams{})
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return
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}
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if dl := rq.navigate(); dl != nil {
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if rq.proxy {
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writeDownload(w, dl)
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} else {
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http.Redirect(w, r, cacheDownload(dl), http.StatusFound)
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}
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return
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}
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if rq.proxy {
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chromedp.Run(ctx, waitForRender())
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var loc string
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chromedp.Run(ctx, chromedp.Location(&loc))
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loc = strings.Replace(loc, "https://", "http://", 1)
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http.Redirect(w, r, loc, http.StatusFound)
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return
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}
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rq.captureScreenshot()
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}
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// TODO: merge this with html mode IMGZ
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func imgServerMap(w http.ResponseWriter, r *http.Request) {
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log.Printf("%s IMG Request for %s\n", r.RemoteAddr, r.URL.Path)
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imgBuf, ok := wrpCach.getImg(r.URL.Path)
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if !ok || imgBuf.Bytes() == nil {
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fmt.Fprintf(w, "Unable to find image %s\n", r.URL.Path)
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log.Printf("%s Unable to find image %s\n", r.RemoteAddr, r.URL.Path)
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return
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}
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switch {
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case strings.HasSuffix(r.URL.Path, ".gif"):
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w.Header().Set("Content-Type", "image/gif")
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case strings.HasSuffix(r.URL.Path, ".png"):
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w.Header().Set("Content-Type", "image/png")
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case strings.HasSuffix(r.URL.Path, ".jpg"):
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w.Header().Set("Content-Type", "image/jpeg")
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}
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w.Header().Set("Content-Length", strconv.Itoa(len(imgBuf.Bytes())))
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w.Header().Set("Cache-Control", "max-age=0")
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w.Header().Set("Expires", "-1")
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w.Header().Set("Pragma", "no-cache")
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w.Write(imgBuf.Bytes())
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w.(http.Flusher).Flush()
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}
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