refactor: quality overhaul (#234)

* fix: prevent queue deadlock after cancelling tasks

Get no longer recurses while holding the mutex.
Cancelled queued tasks leave the map, making their IDs reusable.
Closed empty queues return ErrQueueClosed.

* fix: init task queue lazily and close on shutdown

AddTask is safe before Run by initializing the queue once.
Close unblocks workers waiting in Get.

* fix: make resource fingerprints deterministic

Sort map keys before hashing so Resource.ID is stable.

* fix: harden per-item processing tracking in tasks

Use the resource fingerprint as the dedup key on insert and delete.
Check and set processing entries atomically instead of TOCTOU.
Count only successful downloads.

* fix: honor IgnoreErrors in batch tasks

Element failures no longer cancel sibling elements or stop later groups.

* fix: report streamed upload bytes in batch tasks

Stream downloads report their byte count as the upload total.

* fix: validate i18n key parity across locales

geni18n fails when a language file misses any key.
Align the syncpeers completion key between en and zh-Hans.
Translate three untranslated parse keys in zh-Hans.

* refactor: share progress throttling helpers

Move size-tiered and count-based throttling into progressutil.
Localize hardcoded Chinese progress strings.
Drop five duplicated implementations and dead local copies.

* refactor: share unique filename logic

Storage backends use fsutil.UniquePath instead of local loops.

* fix: sanitize local storage paths

Reject absolute paths and dot-dot escapes in Save.
Check close errors and wrap creation failures.

* fix: preserve webdav error causes

Wrap mkdir and write failures with %w and drop dead error values.

* fix: kill rclone subprocess on reader close

Prevent cat processes from hanging after the pipe is closed.

* fix: fail alist init instead of exiting

Replace log.Fatalf with wrapped errors so a bad alist cannot kill the bot.
Cancel token refresh with the init context and re-login on 401.

* fix: enforce telegram album limits and track saved paths

Use tglimit.MaxAlbumItems for album batching and video splitting.
Exists now reports previously saved paths instead of always false.

* fix: guard storage registry maps

Protect Storages and UserStorages with mutexes and expose read accessors.

* fix: harden JS parser plugin runtime

Validate semver instead of panicking and require canHandle.
Recover plugin worker panics and time out CanHandle calls.
Return a copy from the registry and sanitize install filenames.

* fix: guard kemono parser against nil fields

Skip sparse preview and attachment entries instead of panicking.

* refactor: remove commented-out dead code

Drop unused kemono legacy types and commented response structs.

* test: cover invalid plugin version rejection

* fix: show all queued tasks in /task list

Render up to ten tasks and append the truncation note once.

* fix: guard callback data parsing

Reject malformed callback payloads before indexing split parts.

* fix: isolate media groups per user

Key pending groups by chat, user and group id.

* fix: require permission for callback handlers

* fix: initialize userbot context once

Replace the racy lazy init with sync.OnceValue.

* fix: avoid leaking raw errors in /dir reply

* fix: notify users on invalid update version

* fix: fail fast when API listen fails

Bind synchronously and surface errors instead of logging them.

* fix: add timeouts and backoff to webhook delivery

* refactor: remove dead code from api and bot

Drop the empty ProgressTracker shim, unused token context key and a redundant SetBotCommands call.

* fix: load remote config without local lookup

Skip the local file search after reading a config URL and add a timeout.

* refactor: drop unused hook config

* docs: document parser plugin config

* ci: fix BuildTime formatting and align checkout

Actions format does not format dates; pass the raw timestamp.

* chore: ignore cache directory

* fix: make cache init idempotent

* fix: upload only downloaded batch elements

Failed elements keep partial cache files and never reach the backend.
Successfully downloaded siblings still upload when one element fails.

* fix: record telegram saved paths only after upload

Skip-large returns a sentinel so skipped files are not marked as saved.

* fix: deduplicate alist token refreshes

Guard token access with a mutex and merge concurrent logins.
Reuse a recent refresh to avoid login storms.

* test: cover concurrent alist 401 retry

Ten parallel uploads share a single re-login under -race.

* fix: count parsed resources in progress text

* fix: localize storage lookup errors in /dir

Use the shared i18n key and escape the dynamic error.

* fix: deduplicate concurrent storage initialization

singleflight merges first-time inits so side effects are not duplicated.

* fix: guard nil progress trackers in api-created tasks

Batch, telegraph and transfer tasks run without a Telegram tracker
when created through the API; their callbacks must not panic.

* fix: keep album order when filtering failed batch items

Download results are stored by original index so surviving
elements keep their source order.

* test: cover nil-tracker task execution

* fix: report partial failure in batch done message

IgnoreErrors runs with failed elements show success and failed
counts instead of claiming every file completed.

* fix: skip login refresh for token-only alist storage

401 responses surface the auth error instead of sending a
credential-less login; the refresh window never exceeds TokenExp.

* test: cover alist refresh semantics

Concurrent refresh uses username/password; token-only storage
never attempts a login on 401.

* fix: call tracker from notifyProgress instead of recursing

The helper called itself, overflowing the stack on any batch
task with a progress tracker.

* fix: propagate cancellation past IgnoreErrors

Cancelled tasks must not be reported as successful: only
ordinary element failures are ignored.

* test: cover notifyProgress tracker call

* test: cover cancellation with IgnoreErrors

* fix: refresh alist token after startup 401s

The init login no longer satisfies the dedup window, so an
early 401 triggers a real refresh; later 401s reuse it.
Clarify that streaming uploads cannot replay their body.

* test: exercise the alist 401 refresh path

Concurrent uploads now reject the init token, share one
refresh and retry with the new token; token-only stays inert.

* style: trim verbose comments

Drop process-style explanations; keep one-line behavior notes.

* style: gofmt test files

* fix: drop unbounded saved-path cache in telegram storage

Telegram cannot reliably query remote file existence, so the
cache answered a question it could not answer and grew without
bound. Exists returns false again, as before.

* style: format codes

parsers/js/js.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 	"sync"
+	"time"
 
 	"github.com/charmbracelet/log"
 	"github.com/dop251/goja"
@@ -34,11 +35,23 @@ type jsParserResp struct {
 	err  error
 }
 
+const canHandleTimeout = 10 * time.Second
+
 func (p *jsParser) CanHandle(url string) bool {
 	respCh := make(chan jsParserResp, 1)
-	p.reqCh <- jsParserReq{method: ParserMethodCanHandle, url: url, respCh: respCh}
-	resp := <-respCh
-	return resp.ok && resp.err == nil
+	timer := time.NewTimer(canHandleTimeout)
+	defer timer.Stop()
+	select {
+	case p.reqCh <- jsParserReq{method: ParserMethodCanHandle, url: url, respCh: respCh}:
+	case <-timer.C:
+		return false
+	}
+	select {
+	case resp := <-respCh:
+		return resp.ok && resp.err == nil
+	case <-timer.C:
+		return false
+	}
 }
 
 func (p *jsParser) Parse(ctx context.Context, url string) (*parser.Item, error) {
@@ -61,41 +74,57 @@ func newJSParser(vm *goja.Runtime, canHandleFunc, parseFunc goja.Value, metadata
 
 	go func() {
 		for req := range p.reqCh {
-			switch req.method {
-			case ParserMethodCanHandle:
-				fn, _ := goja.AssertFunction(canHandleFunc)
-				res, err := fn(goja.Undefined(), p.vm.ToValue(req.url))
-				if err != nil {
-					req.respCh <- jsParserResp{ok: false, err: err}
-					continue
-				}
-				req.respCh <- jsParserResp{ok: res.ToBoolean()}
-			case ParserMethodParse:
-				fn, _ := goja.AssertFunction(parseFunc)
-				result, err := fn(goja.Undefined(), p.vm.ToValue(req.url))
-				if err != nil {
-					req.respCh <- jsParserResp{err: err}
-					continue
-				}
-
-				var item parser.Item
-				if exported := result.Export(); exported != nil {
-					data, err := json.Marshal(exported)
+			func() {
+				defer func() {
+					if r := recover(); r != nil {
+						log.Errorf("JS parser %q panicked while handling method %d: %v", p.meta.Name, req.method, r)
+						req.respCh <- jsParserResp{err: fmt.Errorf("JS parser %q panicked: %v", p.meta.Name, r)}
+					}
+				}()
+				switch req.method {
+				case ParserMethodCanHandle:
+					fn, ok := goja.AssertFunction(canHandleFunc)
+					if !ok {
+						req.respCh <- jsParserResp{err: fmt.Errorf("canHandle is not a function")}
+						return
+					}
+					res, err := fn(goja.Undefined(), p.vm.ToValue(req.url))
 					if err != nil {
-						req.respCh <- jsParserResp{err: fmt.Errorf("failed to marshal result to JSON: %w", err)}
-						continue
+						req.respCh <- jsParserResp{ok: false, err: err}
+						return
+					}
+					req.respCh <- jsParserResp{ok: res.ToBoolean()}
+				case ParserMethodParse:
+					fn, ok := goja.AssertFunction(parseFunc)
+					if !ok {
+						req.respCh <- jsParserResp{err: fmt.Errorf("parse is not a function")}
+						return
+					}
+					result, err := fn(goja.Undefined(), p.vm.ToValue(req.url))
+					if err != nil {
+						req.respCh <- jsParserResp{err: err}
+						return
 					}
 
-					if err := json.Unmarshal(data, &item); err != nil {
-						req.respCh <- jsParserResp{err: fmt.Errorf("failed to unmarshal JSON to Item: %w", err)}
-						continue
+					var item parser.Item
+					if exported := result.Export(); exported != nil {
+						data, err := json.Marshal(exported)
+						if err != nil {
+							req.respCh <- jsParserResp{err: fmt.Errorf("failed to marshal result to JSON: %w", err)}
+							return
+						}
+
+						if err := json.Unmarshal(data, &item); err != nil {
+							req.respCh <- jsParserResp{err: fmt.Errorf("failed to unmarshal JSON to Item: %w", err)}
+							return
+						}
+					} else {
+						req.respCh <- jsParserResp{err: fmt.Errorf("JS function returned null or undefined")}
+						return
 					}
-				} else {
-					req.respCh <- jsParserResp{err: fmt.Errorf("JS function returned null or undefined")}
-					continue
+					req.respCh <- jsParserResp{item: &item}
 				}
-				req.respCh <- jsParserResp{item: &item}
-			}
+			}()
 		}
 	}()
 
@@ -116,7 +145,8 @@ func LoadPlugins(ctx context.Context, dir string) error {
 		scriptPath := filepath.Join(dir, e.Name())
 		code, err := os.ReadFile(scriptPath)
 		if err != nil {
-			return err
+			log.Warnf("Failed to read plugin file %s: %v", e.Name(), err)
+			continue
 		}
 
 		vm := goja.New()
@@ -130,7 +160,8 @@ func LoadPlugins(ctx context.Context, dir string) error {
 		vm.Set("playwright", jsPlaywright(vm, logger))
 
 		if _, err := vm.RunString(string(code)); err != nil {
-			return fmt.Errorf("error loading plugin %s: %w", e.Name(), err)
+			logger.Warnf("Failed to load plugin %s: %v", e.Name(), err)
+			continue
 		}
 	}
 	return nil
@@ -164,8 +195,12 @@ func addPlugin(ctx context.Context, code string, name string) error {
 	if len(configuredDirs) > 0 {
 		dir = configuredDirs[0]
 	}
+	fileName := filepath.Base(name)
+	if fileName == "" || fileName == "." || fileName == ".." {
+		return fmt.Errorf("invalid plugin name %q", name)
+	}
 	if err := os.MkdirAll(dir, 0755); err == nil {
-		pluginPath := filepath.Join(dir, name)
+		pluginPath := filepath.Join(dir, fileName)
 		if err := os.WriteFile(pluginPath, []byte(code), 0644); err != nil {
 			logger.Warn("Failed to save plugin file: " + err.Error())
 		}