566 lines
10 KiB
Go
566 lines
10 KiB
Go
/*
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Copyright © 2022 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/rand"
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"os"
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"path/filepath"
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"regexp"
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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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var (
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ErrNoImagesFound = fmt.Errorf("no supported image formats found which match all criteria")
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extensions = [6]string{".jpg", ".jpeg", ".png", ".gif", ".webp", ".bmp"}
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)
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type Files struct {
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Mutex sync.Mutex
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List map[string][]string
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}
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type Stats struct {
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FilesMatched uint64
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FilesSkipped uint64
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DirectoriesMatched uint64
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}
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func (s *Stats) GetFilesTotal() uint64 {
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return atomic.LoadUint64(&s.FilesMatched) + atomic.LoadUint64(&s.FilesSkipped)
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}
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func (s *Stats) IncrementFilesMatched() {
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atomic.AddUint64(&s.FilesMatched, 1)
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}
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func (s *Stats) GetFilesMatched() uint64 {
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return atomic.LoadUint64(&s.FilesMatched)
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}
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func (s *Stats) IncrementFilesSkipped() {
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atomic.AddUint64(&s.FilesSkipped, 1)
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}
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func (s *Stats) GetFilesSkipped() uint64 {
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return atomic.LoadUint64(&s.FilesSkipped)
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}
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func (s *Stats) IncrementDirectoriesMatched() {
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atomic.AddUint64(&s.DirectoriesMatched, 1)
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}
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func (s *Stats) GetDirectoriesMatched() uint64 {
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return atomic.LoadUint64(&s.DirectoriesMatched)
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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 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 getImageDimensions(path string) (string, error) {
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file, err := os.Open(path)
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if err != nil {
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return "", 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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if errors.Is(err, image.ErrFormat) {
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return "", nil
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} else if err != nil {
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return "", err
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}
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return fmt.Sprintf("%vx%v", myImage.Width, myImage.Height), nil
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}
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func preparePath(path string) string {
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if runtime.GOOS == "windows" {
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path = fmt.Sprintf("/%v", 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 *Stats) error {
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// If caching, only check image types once, during the initial scan, to speed up future pickFile() calls
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if Cache {
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image, err := isImage(path)
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if err != nil {
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return err
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}
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if !image {
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return nil
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}
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}
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files.Mutex.Lock()
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files.List[directory] = append(files.List[directory], path)
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files.Mutex.Unlock()
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stats.IncrementFilesMatched()
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return nil
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}
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func appendPaths(path string, files *Files, filters *Filters, stats *Stats) error {
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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.IncrementFilesSkipped()
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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)
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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.IncrementFilesSkipped()
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return nil
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}
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err = appendPath(directory, path, files, stats)
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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 getNewFile(paths []string, filters *Filters, sortOrder string, re regexp.Regexp, fileCache *[]string) (string, error) {
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filePath, err := pickFile(paths, filters, sortOrder, fileCache)
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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, re)
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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 getNextFile(p *Path, sortOrder string) (string, error) {
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switch {
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case sortOrder == "asc":
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p.Increment()
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case sortOrder == "desc":
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p.Decrement()
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default:
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return "", nil
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}
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fileName, err := tryExtensions(p)
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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, re regexp.Regexp) (*Path, error) {
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p := Path{}
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var err error
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split := re.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("%v%.3d%v", 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("%v | Error: Failed to serve file outside specified path(s): %v\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 isImage(path string) (bool, error) {
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file, err := os.Open(path)
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if 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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return filetype.IsImage(head), nil
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}
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func getFiles(path string, files *Files, filters *Filters, stats *Stats, 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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err = appendPaths(p, 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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stats.IncrementDirectoriesMatched()
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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 getFileList(paths []string, files *Files, filters *Filters, stats *Stats, concurrency *Concurrency) {
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var wg sync.WaitGroup
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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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err := getFiles(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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func cleanFilename(filename string) string {
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return filename[:len(filename)-(len(filepath.Ext(filename))+3)]
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}
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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)
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if first == last {
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return append([]string{}, directory[0])
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} else {
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return directory
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}
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}
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func prepareDirectories(files *Files, sort string) []string {
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directories := []string{}
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keys := make([]string, len(files.List))
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i := 0
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for k := range files.List {
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keys[i] = k
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i++
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}
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if sort == "asc" || sort == "desc" {
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for i := 0; i < len(keys); i++ {
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directories = append(directories, prepareDirectory(files.List[keys[i]])...)
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}
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} else {
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for i := 0; i < len(keys); i++ {
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directories = append(directories, files.List[keys[i]]...)
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}
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}
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return directories
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}
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func pickFile(args []string, filters *Filters, sort string, fileCache *[]string) (string, error) {
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var fileList []string
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if Cache && len(*fileCache) != 0 {
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fileList = *fileCache
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} else {
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files := Files{}
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files.List = make(map[string][]string)
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stats := Stats{}
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concurrency := Concurrency{}
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concurrency.DirectoryScans = make(chan int, maxDirectoryScans)
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concurrency.FileScans = make(chan int, maxFileScans)
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startTime := time.Now()
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getFileList(args, &files, filters, &stats, &concurrency)
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runTime := time.Since(startTime)
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if Verbose {
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fmt.Printf("%v | Scanned %v/%v files across %v directories in %v\n",
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time.Now().Format(LOGDATE),
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stats.GetFilesMatched(),
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stats.GetFilesTotal(),
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stats.GetDirectoriesMatched(),
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runTime,
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)
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}
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fileList = prepareDirectories(&files, sort)
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if Cache {
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*fileCache = append(*fileCache, fileList...)
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}
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}
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fileCount := len(fileList)
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if fileCount == 0 {
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return "", ErrNoImagesFound
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}
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r := rand.Intn(fileCount - 1)
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for i := 0; i < fileCount; i++ {
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if r >= (fileCount - 1) {
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r = 0
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} else {
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r++
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}
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filePath := fileList[r]
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if !Cache {
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isImage, err := isImage(filePath)
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if err != nil {
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return "", err
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}
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if isImage {
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return filePath, nil
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}
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continue
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}
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return filePath, nil
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}
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return "", ErrNoImagesFound
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}
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func normalizePaths(args []string) ([]string, error) {
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var paths []string
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fmt.Println("Paths:")
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for i := 0; i < len(args); i++ {
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path, err := filepath.EvalSymlinks(args[i])
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if err != nil {
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return nil, err
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}
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absolutePath, err := filepath.Abs(path)
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if err != nil {
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return nil, err
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}
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if (args[i]) != absolutePath {
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fmt.Printf("%v (resolved to %v)\n", args[i], absolutePath)
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} else {
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fmt.Printf("%v\n", args[i])
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}
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paths = append(paths, absolutePath)
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}
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fmt.Println()
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return paths, nil
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}
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