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// Package swextreload enables reloading Chrome extensions.
package swextreload
import (
"context"
"errors"
"fmt"
"log"
"strings"
"time"
"github.com/chromedp/cdproto/target"
"github.com/chromedp/chromedp"
)
// isDebug controls whether debug printing is enabled.
var isDebug = false
// SetDebugOn turns on debug printing.
func SetDebugOn() {
isDebug = true
}
// Reload reloads the extensions in extensionIDs.
func Reload(
url string,
extensionIDs []string,
shouldReloadTab bool,
) error {
var err error
allocatorContext, _ := chromedp.NewRemoteAllocator(
context.Background(),
url,
)
allocatorContext, cancel := context.WithTimeout(
allocatorContext,
5*time.Second,
)
defer cancel()
ctx, cancel := chromedp.NewContext(allocatorContext)
defer cancel()
targets, err := chromedp.Targets(ctx)
if err != nil {
return fmt.Errorf("swextreload: can't get targets: %v", err)
}
logDebugf("Targets: %#v", targets)
for _, extensionID := range extensionIDs {
err = reloadExtension(
ctx,
targets,
extensionID,
shouldReloadTab,
)
if err != nil {
return err
}
}
if shouldReloadTab {
extensionURL := "chrome-extension://" + extensionIDs[0] + "/"
var firstExtensionTarget *target.Info
for _, target := range targets {
if strings.HasPrefix(target.URL, extensionURL) {
firstExtensionTarget = target
logDebugf(
"firstExtensionTarget %s: %#v",
extensionURL,
firstExtensionTarget,
)
break
}
}
if firstExtensionTarget == nil {
// TODO: continue loop until target != null
return errors.New("swextreload: can't reload tab, no target available")
}
// In Manifest V3, we need to wait until the service worker reinstalls
// before we can re-attach to it.
if !isExtensionManifestV2(firstExtensionTarget) {
time.Sleep(200 * time.Millisecond)
}
err = reloadTab(
allocatorContext,
extensionIDs[0],
firstExtensionTarget,
)
if err != nil {
return err
}
}
return nil
}
// reloadExtension reloads the extension extensionID. If shouldReloadTab is
// true, also reload the current tab.
func reloadExtension(
ctx context.Context,
targets []*target.Info,
extensionID string,
shouldReloadTab bool,
) error {
extensionURL := "chrome-extension://" + extensionID + "/"
for _, target := range targets {
if strings.HasPrefix(target.URL, extensionURL) {
logDebugf("Target: %#v", target)
targetCtx, cancel := chromedp.NewContext(ctx, chromedp.WithTargetID(target.TargetID))
defer cancel()
logDebugf("Connected to target '%s'", target.TargetID)
var runtimeResp []byte
err := chromedp.Run(
targetCtx,
chromedp.Evaluate(`chrome.runtime.reload();`, nil),
)
if err != nil {
return fmt.Errorf(
"swextreload: error reloading extension '%s': %v",
extensionID,
err,
)
}
logDebugf("Reloaded extension")
logDebugf("Runtime: %v", string(runtimeResp))
}
}
return nil
}
func reloadTab(
ctx context.Context,
extensionID string,
reloadTarget *target.Info,
) error {
// Don't cancel the context. Otherwise, the background page DevTools
// window closes.
ctx, cancel := chromedp.NewContext(ctx)
isMV2 := isExtensionManifestV2(reloadTarget)
logDebugf("Reload tab (Manifest V2: %t)", isMV2)
// If the extension is Manifest V3, its `targetId` reset after we reloaded
// the extension from the service worker, presumably because it was
// reinstalled. In that case, we need to get targets again, find the new
// `targetId`, and connect to it.
//
// If the extension is Manifest V2, we can just reconnect to the existing
// target.
if !isMV2 {
targets, err := chromedp.Targets(ctx)
if err != nil {
return fmt.Errorf(
"swextreload: can't get targets for '%s' tab reload: %v",
extensionID,
err,
)
}
logDebugf("Targets: %#v", targets)
extensionURL := "chrome-extension://" + extensionID + "/"
var targetID target.ID
for _, target := range targets {
if strings.HasPrefix(target.URL, extensionURL) {
logDebugf("Target: %#v", target)
targetID = target.TargetID
break
}
}
ctx, cancel = chromedp.NewContext(ctx, chromedp.WithTargetID(targetID))
defer cancel()
} else {
logDebugf("Connecting to target %s", reloadTarget.TargetID)
// Don't cancel the context. Otherwise, the background page DevTools
// window closes.
ctx, _ = chromedp.NewContext(
ctx,
chromedp.WithTargetID(reloadTarget.TargetID),
)
}
var tabsResp []byte
err := chromedp.Run(
ctx,
chromedp.Evaluate(`chrome.tabs.reload();`, nil),
)
if err != nil {
return fmt.Errorf(
"swextreload: error reloading tab '%s': %v",
extensionID,
err,
)
}
logDebugf("Tabs: %v", string(tabsResp))
return nil
}
// isExtensionManifestV2 returns true if target is a Manifest V2 extension.
func isExtensionManifestV2(target *target.Info) bool {
return target.Type == "background_page"
}
// logDebugf prints a debug log if isDebug is on.
func logDebugf(format string, v ...any) {
if !isDebug {
return
}
log.Printf(format, v...)
}
|
