721 lines
13 KiB
Go
721 lines
13 KiB
Go
/*
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Copyright © 2023 Seednode <seednode@seedno.de>
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*/
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package cmd
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import (
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"errors"
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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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"math/big"
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"crypto/rand"
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"os"
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"path/filepath"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"time"
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_ "golang.org/x/image/bmp"
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_ "golang.org/x/image/webp"
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"github.com/h2non/filetype"
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)
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type maxConcurrency int
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const (
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// avoid hitting default open file descriptor limits (1024)
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maxDirectoryScans maxConcurrency = 32
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maxFileScans maxConcurrency = 256
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)
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type Concurrency struct {
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directoryScans chan int
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fileScans chan int
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}
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var (
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ErrNoImagesFound = errors.New("no supported image formats found which match all criteria")
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Extensions = [8]string{".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp", ".mp4", ".webm"}
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)
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type Dimensions struct {
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width int
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height int
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}
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type Files struct {
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mutex sync.RWMutex
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list map[string][]string
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}
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func (f *Files) Append(directory, path string) {
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f.mutex.Lock()
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f.list[directory] = append(f.list[directory], path)
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f.mutex.Unlock()
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}
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type ScanStats struct {
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filesMatched atomic.Uint32
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filesSkipped atomic.Uint32
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directoriesMatched atomic.Uint32
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directoriesSkipped atomic.Uint32
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}
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type Path struct {
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base string
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number int
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extension string
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}
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func (p *Path) increment() {
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p.number = p.number + 1
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}
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func (p *Path) decrement() {
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p.number = p.number - 1
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}
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func contains(s []string, e string) bool {
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for _, a := range s {
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if a == e {
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return true
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}
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}
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return false
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}
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func humanReadableSize(bytes int) string {
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const unit = 1000
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if bytes < unit {
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return fmt.Sprintf("%d B", bytes)
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}
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div, exp := int64(unit), 0
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for n := bytes / unit; n >= unit; n /= unit {
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div *= unit
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exp++
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}
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return fmt.Sprintf("%.1f %cB",
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float64(bytes)/float64(div), "KMGTPE"[exp])
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}
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func imageDimensions(path string) (*Dimensions, error) {
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file, err := os.Open(path)
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switch {
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case errors.Is(err, os.ErrNotExist):
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return &Dimensions{}, nil
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case err != nil:
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return &Dimensions{}, err
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}
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defer file.Close()
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myImage, _, err := image.DecodeConfig(file)
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switch {
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case errors.Is(err, image.ErrFormat):
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return &Dimensions{width: 0, height: 0}, nil
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case err != nil:
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return &Dimensions{}, err
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}
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return &Dimensions{width: myImage.Width, height: myImage.Height}, nil
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}
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func preparePath(path string) string {
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path = ImagePrefix + path
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if runtime.GOOS == "windows" {
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path = fmt.Sprintf("/%s", filepath.ToSlash(path))
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}
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return path
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}
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func appendPath(directory, path string, files *Files, stats *ScanStats, shouldCache bool) error {
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if shouldCache {
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supported, _, err := isSupportedFileType(path)
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if err != nil {
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return err
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}
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if !supported {
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return nil
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}
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}
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files.Append(directory, path)
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stats.filesMatched.Add(1)
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return nil
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}
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func appendPaths(path string, files *Files, filters *Filters, stats *ScanStats) error {
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shouldCache := cache && filters.IsEmpty()
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absolutePath, err := filepath.Abs(path)
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if err != nil {
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return err
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}
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directory, filename := filepath.Split(absolutePath)
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filename = strings.ToLower(filename)
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if filters.HasExcludes() {
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for i := 0; i < len(filters.excludes); i++ {
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if strings.Contains(
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filename,
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filters.excludes[i],
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) {
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stats.filesSkipped.Add(1)
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return nil
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}
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}
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}
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if filters.HasIncludes() {
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for i := 0; i < len(filters.includes); i++ {
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if strings.Contains(
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filename,
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filters.includes[i],
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) {
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err := appendPath(directory, path, files, stats, shouldCache)
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if err != nil {
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return err
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}
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return nil
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}
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}
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stats.filesSkipped.Add(1)
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return nil
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}
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err = appendPath(directory, path, files, stats, shouldCache)
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if err != nil {
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return err
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}
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return nil
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}
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func newFile(paths []string, filters *Filters, sortOrder string, Regexes *Regexes, index *Index) (string, error) {
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filePath, err := pickFile(paths, filters, sortOrder, index)
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if err != nil {
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return "", nil
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}
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path, err := splitPath(filePath, Regexes)
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if err != nil {
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return "", err
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}
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path.number = 1
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switch {
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case sortOrder == "asc":
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filePath, err = tryExtensions(path)
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if err != nil {
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return "", err
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}
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case sortOrder == "desc":
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for {
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path.increment()
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filePath, err = tryExtensions(path)
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if err != nil {
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return "", err
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}
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if filePath == "" {
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path.decrement()
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filePath, err = tryExtensions(path)
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if err != nil {
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return "", err
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}
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break
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}
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}
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}
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return filePath, nil
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}
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func nextFile(filePath, sortOrder string, Regexes *Regexes) (string, error) {
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path, err := splitPath(filePath, Regexes)
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if err != nil {
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return "", err
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}
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switch {
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case sortOrder == "asc":
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path.increment()
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case sortOrder == "desc":
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path.decrement()
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default:
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return "", nil
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}
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fileName, err := tryExtensions(path)
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if err != nil {
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return "", err
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}
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return fileName, err
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}
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func splitPath(path string, Regexes *Regexes) (*Path, error) {
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p := Path{}
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var err error
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split := Regexes.filename.FindAllStringSubmatch(path, -1)
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if len(split) < 1 || len(split[0]) < 3 {
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return &Path{}, nil
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}
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p.base = split[0][1]
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p.number, err = strconv.Atoi(split[0][2])
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if err != nil {
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return &Path{}, err
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}
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p.extension = split[0][3]
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return &p, nil
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}
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func tryExtensions(p *Path) (string, error) {
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var fileName string
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for _, extension := range Extensions {
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fileName = fmt.Sprintf("%s%.3d%s", p.base, p.number, extension)
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exists, err := fileExists(fileName)
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if err != nil {
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return "", err
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}
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if exists {
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return fileName, nil
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}
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}
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return "", nil
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}
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func fileExists(path string) (bool, error) {
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_, err := os.Stat(path)
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switch {
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case err == nil:
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return true, nil
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case errors.Is(err, os.ErrNotExist):
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return false, nil
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default:
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return false, err
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}
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}
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func pathIsValid(filePath string, paths []string) bool {
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var matchesPrefix = false
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for i := 0; i < len(paths); i++ {
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if strings.HasPrefix(filePath, paths[i]) {
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matchesPrefix = true
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}
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}
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switch {
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case verbose && !matchesPrefix:
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fmt.Printf("%s | Error: Failed to serve file outside specified path(s): %s\n",
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time.Now().Format(LogDate),
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filePath,
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)
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return false
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case !matchesPrefix:
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return false
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default:
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return true
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}
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}
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func isSupportedFileType(path string) (bool, string, error) {
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file, err := os.Open(path)
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switch {
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case errors.Is(err, os.ErrNotExist):
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return false, "", nil
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case err != nil:
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return false, "", err
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}
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defer file.Close()
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head := make([]byte, 261)
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file.Read(head)
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switch {
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case filetype.IsImage(head):
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return true, "image", nil
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case filetype.IsVideo(head):
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return true, "video", nil
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default:
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return false, "", nil
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}
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}
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func pathHasSupportedFiles(path string) (bool, error) {
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hasSupportedFiles := make(chan bool, 1)
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err := filepath.WalkDir(path, func(p string, info os.DirEntry, err error) error {
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if err != nil {
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return err
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}
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switch {
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case !recursive && info.IsDir() && p != path:
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return filepath.SkipDir
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case !info.IsDir():
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supported, _, err := isSupportedFileType(p)
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if err != nil {
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return err
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}
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if supported {
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hasSupportedFiles <- true
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return filepath.SkipAll
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}
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}
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return err
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})
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if err != nil {
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return false, err
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}
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select {
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case <-hasSupportedFiles:
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return true, nil
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default:
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return false, nil
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}
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}
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func pathCount(path string) (uint32, uint32, error) {
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var directories uint32 = 0
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var files uint32 = 0
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nodes, err := os.ReadDir(path)
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if err != nil {
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return 0, 0, err
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}
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for _, node := range nodes {
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if node.IsDir() {
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directories++
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} else {
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files++
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}
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}
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return files, directories, nil
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}
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func scanPath(path string, files *Files, filters *Filters, stats *ScanStats, concurrency *Concurrency) error {
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var wg sync.WaitGroup
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err := filepath.WalkDir(path, func(p string, info os.DirEntry, err error) error {
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if err != nil {
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return err
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}
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switch {
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case !recursive && info.IsDir() && p != path:
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return filepath.SkipDir
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case !info.IsDir():
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wg.Add(1)
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concurrency.fileScans <- 1
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go func() {
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defer func() {
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<-concurrency.fileScans
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wg.Done()
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}()
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path, err := normalizePath(p)
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if err != nil {
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fmt.Println(err)
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}
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err = appendPaths(path, files, filters, stats)
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if err != nil {
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fmt.Println(err)
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}
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}()
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case info.IsDir():
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files, directories, err := pathCount(p)
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if err != nil {
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fmt.Println(err)
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}
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if files > 0 && (files < minimumFileCount) || (files > maximumFileCount) {
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// This count will not otherwise include the parent directory itself, so increment by one
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stats.directoriesSkipped.Add(directories + 1)
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stats.filesSkipped.Add(files)
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return filepath.SkipDir
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}
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stats.directoriesMatched.Add(1)
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}
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return err
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})
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wg.Wait()
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if err != nil {
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return err
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}
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return nil
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}
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func fileList(paths []string, filters *Filters, sort string, index *Index) ([]string, bool) {
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if cache && filters.IsEmpty() && !index.IsEmpty() {
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return index.Index(), true
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}
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var fileList []string
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files := &Files{
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mutex: sync.RWMutex{},
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list: make(map[string][]string),
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}
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stats := &ScanStats{
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filesMatched: atomic.Uint32{},
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filesSkipped: atomic.Uint32{},
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directoriesMatched: atomic.Uint32{},
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directoriesSkipped: atomic.Uint32{},
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}
|
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|
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concurrency := &Concurrency{
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directoryScans: make(chan int, maxDirectoryScans),
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fileScans: make(chan int, maxFileScans),
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}
|
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|
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var wg sync.WaitGroup
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|
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startTime := time.Now()
|
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|
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for i := 0; i < len(paths); i++ {
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wg.Add(1)
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concurrency.directoryScans <- 1
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go func(i int) {
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defer func() {
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<-concurrency.directoryScans
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wg.Done()
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}()
|
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|
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err := scanPath(paths[i], files, filters, stats, concurrency)
|
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if err != nil {
|
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fmt.Println(err)
|
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}
|
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}(i)
|
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}
|
|
|
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wg.Wait()
|
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|
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fileList = prepareDirectories(files, sort)
|
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|
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if stats.filesMatched.Load() < 1 {
|
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return []string{}, false
|
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}
|
|
|
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if verbose {
|
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fmt.Printf("%s | Indexed %d/%d files across %d/%d directories in %s\n",
|
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time.Now().Format(LogDate),
|
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stats.filesMatched.Load(),
|
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stats.filesMatched.Load()+stats.filesSkipped.Load(),
|
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stats.directoriesMatched.Load(),
|
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stats.directoriesMatched.Load()+stats.directoriesSkipped.Load(),
|
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time.Since(startTime),
|
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)
|
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}
|
|
|
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if cache && filters.IsEmpty() {
|
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index.setIndex(fileList)
|
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}
|
|
|
|
return fileList, false
|
|
}
|
|
|
|
func cleanFilename(filename string) string {
|
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return filename[:len(filename)-(len(filepath.Ext(filename))+3)]
|
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}
|
|
|
|
func prepareDirectory(directory []string) []string {
|
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_, first := filepath.Split(directory[0])
|
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first = cleanFilename(first)
|
|
|
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_, last := filepath.Split(directory[len(directory)-1])
|
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last = cleanFilename(last)
|
|
|
|
if first == last {
|
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return []string{directory[0]}
|
|
} else {
|
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return directory
|
|
}
|
|
}
|
|
|
|
func prepareDirectories(files *Files, sort string) []string {
|
|
directories := []string{}
|
|
|
|
keys := make([]string, len(files.list))
|
|
|
|
i := 0
|
|
for k := range files.list {
|
|
keys[i] = k
|
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i++
|
|
}
|
|
|
|
if sort == "asc" || sort == "desc" {
|
|
for i := 0; i < len(keys); i++ {
|
|
directories = append(directories, prepareDirectory(files.list[keys[i]])...)
|
|
}
|
|
} else {
|
|
for i := 0; i < len(keys); i++ {
|
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directories = append(directories, files.list[keys[i]]...)
|
|
}
|
|
}
|
|
|
|
return directories
|
|
}
|
|
|
|
func pickFile(args []string, filters *Filters, sort string, index *Index) (string, error) {
|
|
fileList, fromCache := fileList(args, filters, sort, index)
|
|
|
|
fileCount := len(fileList)
|
|
if fileCount < 1 {
|
|
return "", ErrNoImagesFound
|
|
}
|
|
|
|
r, err := rand.Int(rand.Reader, big.NewInt(int64(fileCount-2)))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
val, err := strconv.Atoi(strconv.FormatInt(r.Int64(), 10))
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
for i := 0; i < fileCount; i++ {
|
|
if val >= fileCount {
|
|
val = 0
|
|
} else {
|
|
val++
|
|
}
|
|
|
|
filePath := fileList[val]
|
|
|
|
if !fromCache {
|
|
supported, _, err := isSupportedFileType(filePath)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
if supported {
|
|
return filePath, nil
|
|
}
|
|
|
|
continue
|
|
}
|
|
|
|
return filePath, nil
|
|
}
|
|
|
|
return "", ErrNoImagesFound
|
|
}
|
|
|
|
func normalizePath(path string) (string, error) {
|
|
path, err := filepath.EvalSymlinks(path)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
absolutePath, err := filepath.Abs(path)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return absolutePath, nil
|
|
}
|
|
|
|
func normalizePaths(args []string) ([]string, error) {
|
|
var paths []string
|
|
|
|
var pathList strings.Builder
|
|
pathList.WriteString("Paths:\n")
|
|
|
|
for i := 0; i < len(args); i++ {
|
|
path, err := normalizePath(args[i])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
pathMatches := (args[i] == path)
|
|
|
|
hasSupportedFiles, err := pathHasSupportedFiles(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var addPath bool = false
|
|
|
|
switch {
|
|
case pathMatches && hasSupportedFiles:
|
|
pathList.WriteString(fmt.Sprintf("%s\n", args[i]))
|
|
addPath = true
|
|
case !pathMatches && hasSupportedFiles:
|
|
pathList.WriteString(fmt.Sprintf("%s (resolved to %s)\n", args[i], path))
|
|
addPath = true
|
|
case pathMatches && !hasSupportedFiles:
|
|
pathList.WriteString(fmt.Sprintf("%s [No supported files found]\n", args[i]))
|
|
case !pathMatches && !hasSupportedFiles:
|
|
pathList.WriteString(fmt.Sprintf("%s (resolved to %s) [No supported files found]\n", args[i], path))
|
|
}
|
|
|
|
if addPath {
|
|
paths = append(paths, path)
|
|
}
|
|
}
|
|
|
|
if len(paths) > 0 {
|
|
fmt.Println(pathList.String())
|
|
}
|
|
|
|
return paths, nil
|
|
}
|