refactor: improve error handling and response formatting in API

internal/homepage/widgets/http.go

@@ -0,0 +1,14 @@
+package widgets
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/yusing/go-proxy/internal/gperr"
+)
+
+var HTTPClient = &http.Client{
+	Timeout: 10 * time.Second,
+}
+
+var ErrHTTPStatus = gperr.New("http status")

internal/homepage/widgets/widgets.go

@@ -0,0 +1,49 @@
+package widgets
+
+import (
+	"context"
+
+	"github.com/yusing/go-proxy/internal/gperr"
+	"github.com/yusing/go-proxy/internal/utils"
+)
+
+type (
+	Config struct {
+		Provider string `json:"provider"`
+		Config   Widget `json:"config"`
+	}
+	Widget interface {
+		Initialize(ctx context.Context, url string, cfg map[string]any) error
+		Data(ctx context.Context) ([]NameValue, error)
+	}
+	NameValue struct {
+		Name  string `json:"name"`
+		Value string `json:"value"`
+	}
+)
+
+const (
+	WidgetProviderQbittorrent = "qbittorrent"
+)
+
+var widgetProviders = map[string]struct{}{
+	WidgetProviderQbittorrent: {},
+}
+
+var ErrInvalidProvider = gperr.New("invalid provider")
+
+func (cfg *Config) UnmarshalMap(m map[string]any) error {
+	cfg.Provider = m["provider"].(string)
+	if _, ok := widgetProviders[cfg.Provider]; !ok {
+		return ErrInvalidProvider.Subject(cfg.Provider)
+	}
+	delete(m, "provider")
+	m, ok := m["config"].(map[string]any)
+	if !ok {
+		return gperr.New("invalid config")
+	}
+	if err := utils.MapUnmarshalValidate(m, &cfg.Config); err != nil {
+		return err
+	}
+	return nil
+}