Rename config vars. Add widget holder template and endpoint to serve it. Add dockerfile

internal/api/widget/module.go

@@ -0,0 +1,9 @@
+package widget
+
+import (
+	"go.uber.org/fx"
+)
+
+var Module = fx.Options(
+	fx.Provide(NewWidgetHandler),
+)

internal/api/widget/widget_handler.go

@@ -0,0 +1,55 @@
+package widget
+
+import (
+	"html/template"
+	"net/http"
+
+	"go.uber.org/fx"
+
+	"payouts/internal/service/yookassa"
+	yookassaConf "payouts/internal/service/yookassa/config"
+	"payouts/internal/templates"
+)
+
+const WidgetPage = "/payout/widget"
+
+type Handler interface {
+	WidgetHandler(http.ResponseWriter, *http.Request)
+}
+
+type widgetHandler struct {
+	template *template.Template
+	config   yookassaConf.YooKassa
+}
+
+// Params represents the module input params
+type Params struct {
+	fx.In
+
+	YookassaService yookassa.Service
+}
+
+func NewWidgetHandler(p Params) (Handler, error) {
+	return &widgetHandler{
+		template: templates.Templates,
+		config:   p.YookassaService.GetConfig(),
+	}, nil
+}
+
+// WidgetHandler renders the payouts widget page
+func (h *widgetHandler) WidgetHandler(w http.ResponseWriter, r *http.Request) {
+	data := struct {
+		ApiPayoutKey string
+		WidgetVersion string
+	}{
+		ApiPayoutKey: h.config.ApiPayoutKey,
+		WidgetVersion: h.config.WidgetVersion,
+	}
+
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
+	err := h.template.ExecuteTemplate(w, "payouts-widget.html", data)
+	if err != nil {
+		http.Error(w, "internal error", http.StatusInternalServerError)
+		return
+	}
+}