feat: 添加媒体播放功能，支持基于短时效token的播放入口及相关API接口

backend/app/http/tenant/content.go

@@ -1,6 +1,10 @@
 package tenant
 
 import (
+	"encoding/json"
+	"net/url"
+	"time"
+
 	"quyun/v2/app/errorx"
 	"quyun/v2/app/http/tenant/dto"
 	"quyun/v2/app/requests"
@@ -104,13 +108,32 @@ func (*content) previewAssets(ctx fiber.Ctx, tenant *models.Tenant, user *models
 		return nil, err
 	}
 
+	playables := make([]*dto.ContentPlayableAsset, 0, len(assets))
+	for _, asset := range assets {
+		token, expiresAt, err := services.MediaDelivery.CreatePlayToken(tenant.ID, contentID, asset.ID, consts.ContentAssetRolePreview, user.ID, 0, time.Now())
+		if err != nil {
+			return nil, err
+		}
+		var meta json.RawMessage
+		if len(asset.Meta) > 0 {
+			meta = json.RawMessage(asset.Meta)
+		}
+		playables = append(playables, &dto.ContentPlayableAsset{
+			AssetID:   asset.ID,
+			Type:      asset.Type,
+			PlayURL:   "/t/" + tenant.Code + "/v1/media/play?token=" + url.QueryEscape(token),
+			ExpiresAt: expiresAt,
+			Meta:      meta,
+		})
+	}
+
 	previewSeconds := int32(detail.Content.PreviewSeconds)
 	if previewSeconds <= 0 {
 		previewSeconds = consts.DefaultContentPreviewSeconds
 	}
 	return &dto.ContentAssetsResponse{
 		Content:        detail.Content,
-		Assets:         assets,
+		Assets:         playables,
 		PreviewSeconds: previewSeconds,
 	}, nil
 }
@@ -150,8 +173,27 @@ func (*content) mainAssets(ctx fiber.Ctx, tenant *models.Tenant, user *models.Us
 		return nil, err
 	}
 
+	playables := make([]*dto.ContentPlayableAsset, 0, len(assets))
+	for _, asset := range assets {
+		token, expiresAt, err := services.MediaDelivery.CreatePlayToken(tenant.ID, contentID, asset.ID, consts.ContentAssetRoleMain, user.ID, 0, time.Now())
+		if err != nil {
+			return nil, err
+		}
+		var meta json.RawMessage
+		if len(asset.Meta) > 0 {
+			meta = json.RawMessage(asset.Meta)
+		}
+		playables = append(playables, &dto.ContentPlayableAsset{
+			AssetID:   asset.ID,
+			Type:      asset.Type,
+			PlayURL:   "/t/" + tenant.Code + "/v1/media/play?token=" + url.QueryEscape(token),
+			ExpiresAt: expiresAt,
+			Meta:      meta,
+		})
+	}
+
 	return &dto.ContentAssetsResponse{
 		Content: detail.Content,
-		Assets:  assets,
+		Assets:  playables,
 	}, nil
 }