Add json marshaling/unmarshaling

go.mod

@@ -8,8 +8,8 @@ require (
 	github.com/disintegration/imaging v1.6.2
 	github.com/gen2brain/avif v0.3.1
 	github.com/spakin/netpbm v1.3.0
-	golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8
+	golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa
-	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
+	golang.org/x/image v0.19.0
 )
 
 require (

go.sum

@@ -8,10 +8,11 @@ github.com/spakin/netpbm v1.3.0 h1:eDX7VvrkN5sHXW0luZXRA4AKDlLmu0E5sNxJ7VSTwxc=
 github.com/spakin/netpbm v1.3.0/go.mod h1:Q+ep6vNv1G44qSWp0wt3Y9o1m/QXjmaXZIFC0PMVpq0=
 github.com/tetratelabs/wazero v1.7.1 h1:QtSfd6KLc41DIMpDYlJdoMc6k7QTN246DM2+n2Y/Dx8=
 github.com/tetratelabs/wazero v1.7.1/go.mod h1:ytl6Zuh20R/eROuyDaGPkp82O9C/DJfXAwJfQ3X6/7Y=
-golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 h1:aAcj0Da7eBAtrTp03QXWvm88pSyOt+UgdZw2BFZ+lEw=
+golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa h1:ELnwvuAXPNtPk1TJRuGkI9fDTwym6AYBu0qzT8AcHdI=
-golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8/go.mod h1:CQ1k9gNrJ50XIzaKCRR2hssIjF07kZFEiieALBM/ARQ=
+golang.org/x/exp v0.0.0-20240808152545-0cdaa3abc0fa/go.mod h1:akd2r19cwCdwSwWeIdzYQGa/EZZyqcOdwWiwj5L5eKQ=
-golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8 h1:hVwzHzIUGRjiF7EcUjqNxk3NCfkPxbDKRdnNE1Rpg0U=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/image v0.19.0 h1:D9FX4QWkLfkeqaC62SonffIIuYdOk/UE2XKUBgRIBIQ=
+golang.org/x/image v0.19.0/go.mod h1:y0zrRqlQRWQ5PXaYCOMLTW2fpsxZ8Qh9I/ohnInJEys=
 golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
 golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

imagehash.go

@@ -8,6 +8,7 @@ import (
 	"encoding/binary"
 	"encoding/gob"
 	"encoding/hex"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -36,19 +37,55 @@ const (
 	Unknown Kind = iota
 	// AHash is a enum value of the average hash.
 	AHash
-	// PHash is a enum value of the perceptual hash.
-	PHash
 	// DHash is a enum value of the difference hash.
 	DHash
+	// PHash is a enum value of the perceptual hash.
+	PHash
 	// WHash is a enum value of the wavelet hash.
 	WHash
 )
 
+var kindNames = map[Kind]string{
+	Unknown: "Unknown",
+	AHash:   "ahash",
+	DHash:   "dhash",
+	PHash:   "phash",
+	WHash:   "whash",
+}
+
+var nameKinds = map[string]Kind{
+	"Unknown": Unknown,
+	"ahash":   AHash,
+	"dhash":   DHash,
+	"phash":   PHash,
+	"whash":   WHash,
+}
+
 // NewImageHash function creates a new image hash.
 func NewImageHash(hash uint64, kind Kind) *ImageHash {
 	return &ImageHash{hash: hash, kind: kind}
 }
 
+func (k Kind) String() string {
+	if name, ok := kindNames[k]; ok {
+		return name
+	}
+	return "Unknown"
+}
+func (k *Kind) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	*k = nameKinds[s]
+
+	return nil
+}
+
+func (k *Kind) MarshalJSON() ([]byte, error) {
+	return json.Marshal(k.String())
+}
+
 // Bits method returns an actual hash bit size
 func (h *ImageHash) Bits() int {
 	return 64