Initial open source release

internal/store/postgres/media_codec.go

@@ -0,0 +1,88 @@
+package postgres
+
+import (
+	"encoding/json"
+
+	"telesrv/internal/domain"
+)
+
+// 媒体相关 JSON 编解码：domain 值对象 ↔ JSONB 列。domain.* 带 json tag，可直接 marshal。
+
+// jsonArrayOrEmpty 把切片序列化为 JSONB；nil 序列化为 "[]"（列为 NOT NULL DEFAULT '[]'）。
+func jsonArrayOrEmpty(v any) ([]byte, error) {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return nil, err
+	}
+	if string(b) == "null" {
+		return []byte("[]"), nil
+	}
+	return b, nil
+}
+
+// encodeMessageMedia 把消息媒体快照序列化为 JSONB；无媒体序列化为 "{}"。
+func encodeMessageMedia(m *domain.MessageMedia) ([]byte, error) {
+	if m.IsZero() {
+		return []byte("{}"), nil
+	}
+	return json.Marshal(m)
+}
+
+// decodeMessageMedia 把消息行的 media JSONB 文本还原为 *MessageMedia；空载荷返回 nil。
+func decodeMessageMedia(s string) (*domain.MessageMedia, error) {
+	if s == "" || s == "{}" || s == "null" {
+		return nil, nil
+	}
+	var m domain.MessageMedia
+	if err := json.Unmarshal([]byte(s), &m); err != nil {
+		return nil, err
+	}
+	if m.IsZero() {
+		return nil, nil
+	}
+	return &m, nil
+}
+
+func decodePhotoSizes(s string) ([]domain.PhotoSize, error) {
+	if s == "" || s == "[]" || s == "null" {
+		return nil, nil
+	}
+	var out []domain.PhotoSize
+	if err := json.Unmarshal([]byte(s), &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func decodeDocumentAttributes(s string) ([]domain.DocumentAttribute, error) {
+	if s == "" || s == "[]" || s == "null" {
+		return nil, nil
+	}
+	var out []domain.DocumentAttribute
+	if err := json.Unmarshal([]byte(s), &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func decodeInt64Slice(s string) ([]int64, error) {
+	if s == "" || s == "[]" || s == "null" {
+		return nil, nil
+	}
+	var out []int64
+	if err := json.Unmarshal([]byte(s), &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func decodeStickerPacks(s string) ([]domain.StickerPack, error) {
+	if s == "" || s == "[]" || s == "null" {
+		return nil, nil
+	}
+	var out []domain.StickerPack
+	if err := json.Unmarshal([]byte(s), &out); err != nil {
+		return nil, err
+	}
+	return out, nil
+}