Handle file rescan (#2951)

* Fire handlers when file updated or moved
* Create galleries as needed
* Clean empty galleries
* Handle cleaning zip folders when path changed
* Fix gallery association on duplicate images
* Re-create missing folder-based galleries

pkg/models/model_file.go

@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"io"
 	"strconv"
-	"time"
 )
 
 type HashAlgorithm string
@@ -48,28 +47,3 @@ func (e *HashAlgorithm) UnmarshalGQL(v interface{}) error {
 func (e HashAlgorithm) MarshalGQL(w io.Writer) {
 	fmt.Fprint(w, strconv.Quote(e.String()))
 }
-
-type File struct {
-	Checksum    string    `db:"checksum" json:"checksum"`
-	OSHash      string    `db:"oshash" json:"oshash"`
-	Path        string    `db:"path" json:"path"`
-	Size        string    `db:"size" json:"size"`
-	FileModTime time.Time `db:"file_mod_time" json:"file_mod_time"`
-}
-
-// GetHash returns the hash of the scene, based on the hash algorithm provided. If
-// hash algorithm is MD5, then Checksum is returned. Otherwise, OSHash is returned.
-func (s File) GetHash(hashAlgorithm HashAlgorithm) string {
-	switch hashAlgorithm {
-	case HashAlgorithmMd5:
-		return s.Checksum
-	case HashAlgorithmOshash:
-		return s.OSHash
-	default:
-		panic("unknown hash algorithm")
-	}
-}
-
-func (s File) Equal(o File) bool {
-	return s.Path == o.Path && s.Checksum == o.Checksum && s.OSHash == o.OSHash && s.Size == o.Size && s.FileModTime.Equal(o.FileModTime)
-}