init: 初始化项目

internal/updater/service.go

@@ -0,0 +1,84 @@
+package updater
+
+import (
+	"errors"
+	"nebula/internal/asset"
+	"nebula/internal/release"
+	"nebula/pkg/util"
+
+	"gorm.io/gorm"
+)
+
+type CheckRequest struct {
+	App      string
+	Version  string
+	Platform string
+	Arch     string
+}
+
+type CheckResponse struct {
+	Update   bool   `json:"update"`
+	Version  string `json:"version,omitempty"`
+	Notes    string `json:"notes,omitempty"`
+	URL      string `json:"url,omitempty"`
+	Checksum string `json:"checksum,omitempty"`
+}
+
+func CheckUpdate(db *gorm.DB, req CheckRequest) (*CheckResponse, error) {
+	// 参数验证
+	if req.App == "" {
+		return nil, errors.New("app is required")
+	}
+	if req.Version == "" {
+		return nil, errors.New("version is required")
+	}
+	if req.Platform == "" {
+		return nil, errors.New("platform is required")
+	}
+	if req.Arch == "" {
+		return nil, errors.New("arch is required")
+	}
+
+	// 查找最新版本（按发布日期排序）
+	var latest release.Release
+	err := db.Where("app_id = ?", req.App).
+		Order("pub_date DESC").
+		First(&latest).Error
+
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("no release found for this app")
+		}
+		return nil, err
+	}
+
+	// 比较版本号
+	if !util.IsNewerVersion(req.Version, latest.Version) {
+		return &CheckResponse{Update: false}, nil
+	}
+
+	// 查找对应平台和架构的资源
+	var ast asset.Asset
+	err = db.Where("release_id = ? AND platform = ? AND arch = ?",
+		latest.ID, req.Platform, req.Arch).First(&ast).Error
+
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, errors.New("no asset found for this platform and architecture")
+		}
+		return nil, err
+	}
+
+	// 验证资源 URL 是否存在
+	if ast.URL == "" {
+		return nil, errors.New("asset URL is empty")
+	}
+
+	return &CheckResponse{
+		Update:   true,
+		Version:  latest.Version,
+		Notes:    latest.Notes,
+		URL:      ast.URL,
+		Checksum: ast.Checksum,
+	}, nil
+}