精简后的项目：仅保留 api/ui 源码、文档、构建依赖

api/scanner/scanner_tasks/exif_task.go

@@ -0,0 +1,74 @@
+package scanner_tasks
+
+import (
+	"errors"
+	"fmt"
+
+	"gorm.io/gorm"
+
+	"github.com/photoview/photoview/api/graphql/models"
+	"github.com/photoview/photoview/api/log"
+	"github.com/photoview/photoview/api/scanner/externaltools/exif"
+	"github.com/photoview/photoview/api/scanner/scanner_task"
+)
+
+type ExifTask struct {
+	scanner_task.ScannerTaskBase
+}
+
+func (t ExifTask) AfterMediaFound(ctx scanner_task.TaskContext, media *models.Media, newMedia bool) error {
+	if !newMedia {
+		return nil
+	}
+
+	if err := SaveEXIF(ctx.GetDB(), media); err != nil {
+		log.Warn(ctx, "SaveEXIF failed", "title", media.Title, "error", err, "path", media.Path)
+	}
+
+	return nil
+}
+
+// SaveEXIF scans the media file for exif metadata and saves it in the database if found
+func SaveEXIF(tx *gorm.DB, media *models.Media) error {
+	// Check if EXIF data already exists
+	if media.ExifID != nil {
+		var e models.MediaEXIF
+		var err error
+		if err = tx.First(&e, media.ExifID).Error; err == nil {
+			return nil
+		}
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return fmt.Errorf("failed to get EXIF for %q from database: %w", media.Path, err)
+		}
+		log.Warn(
+			tx.Statement.Context,
+			"EXIF metadata not found in database, will re-parse it",
+			"path", media.Path,
+			"error", err,
+		)
+		media.ExifID = nil
+	}
+
+	exifData, err := exif.Parse(media.Path)
+	if err != nil {
+		return fmt.Errorf("failed to parse exif data: %w", err)
+	}
+
+	if exifData == nil {
+		return nil
+	}
+
+	// Add EXIF to database and link to media
+	if err := tx.Model(media).Association("Exif").Replace(exifData); err != nil {
+		return fmt.Errorf("failed to save media exif to database: %w", err)
+	}
+
+	if exifData.DateShot != nil && !exifData.DateShot.Equal(media.DateShot) {
+		if err := tx.Save(media).Error; err != nil {
+			return fmt.Errorf("failed to update EXIF metadata for the media %s: %w", media.Path, err)
+		}
+		media.DateShot = *exifData.DateShot
+	}
+
+	return nil
+}