114 lines
2.6 KiB
Go
114 lines
2.6 KiB
Go
package backend
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import (
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"bufio"
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"fmt"
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"image"
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"io"
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"io/fs"
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"os"
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"path/filepath"
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"strings"
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"github.com/chai2010/webp"
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"github.com/disintegration/imaging"
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"github.com/google/uuid"
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)
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var ErrUnsupportedFormat error = image.ErrFormat // used internally by imaging
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func SaveImage(src io.Reader, maxHeight, maxWidth int, path string) (string, error) {
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img, err := imaging.Decode(src, imaging.AutoOrientation(true))
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if err != nil {
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if err == ErrUnsupportedFormat {
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return "", ErrUnsupportedFormat
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}
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return "", fmt.Errorf("error decoding image: %v", err)
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}
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if img.Bounds().Dy() > maxHeight {
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img = imaging.Resize(img, 0, maxHeight, imaging.Lanczos)
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}
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if img.Bounds().Dx() > maxWidth {
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img = imaging.Resize(img, maxWidth, 0, imaging.Lanczos)
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}
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filename := fmt.Sprint(uuid.New(), ".webp")
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file, err := os.Create(filepath.Join(path, filename))
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if err != nil {
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return "", fmt.Errorf("error creating new image file: %v", err)
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}
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defer file.Close()
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if err = webp.Encode(file, img, &webp.Options{Quality: 80}); err != nil {
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return "", fmt.Errorf("error encoding image as webp: %v", err)
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}
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return filename, nil
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}
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func CleanUpImages(c *Config, db *DB) error {
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if err := filepath.Walk(c.PicsDir, func(path string, info fs.FileInfo, err error) error {
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if err != nil {
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return fmt.Errorf("error walking images filepath: %v", err)
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}
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if !info.IsDir() {
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imageName := info.Name()
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imagePath := path
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imageWasFound := false
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if err = filepath.Walk(c.ArticleDir, func(path string, info fs.FileInfo, err error) error {
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if err != nil {
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return fmt.Errorf("error walking articles filepath: %v", err)
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}
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if !info.IsDir() {
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mdFile, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("error opening article %v: %v", info.Name(), err)
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}
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defer mdFile.Close()
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scanner := bufio.NewScanner(mdFile)
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for scanner.Scan() {
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if strings.Contains(scanner.Text(), imageName) {
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imageWasFound = true
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}
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}
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return scanner.Err()
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}
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return nil
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}); err != nil {
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return fmt.Errorf("error walking articles filepath: %v", err)
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}
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users, err := db.GetAllUsers(c)
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if err != nil {
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return fmt.Errorf("error getting all users: %v", err)
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}
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for _, user := range users {
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if imageName == user.ProfilePicLink {
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imageWasFound = true
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}
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}
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if !imageWasFound {
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if err = os.Remove(imagePath); err != nil {
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return fmt.Errorf("error removing unused image: %v", err)
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}
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}
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}
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return nil
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}); err != nil {
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return fmt.Errorf("error cleaning up: %v", err)
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}
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return nil
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}
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