Restructure & refactor codebase

internal/glance/widget-iframe.go

@@ -0,0 +1,45 @@
+package glance
+
+import (
+	"errors"
+	"fmt"
+	"html/template"
+	"net/url"
+)
+
+var iframeWidgetTemplate = mustParseTemplate("iframe.html", "widget-base.html")
+
+type iframeWidget struct {
+	widgetBase `yaml:",inline"`
+	cachedHTML template.HTML `yaml:"-"`
+	Source     string        `yaml:"source"`
+	Height     int           `yaml:"height"`
+}
+
+func (widget *iframeWidget) initialize() error {
+	widget.withTitle("IFrame").withError(nil)
+
+	if widget.Source == "" {
+		return errors.New("source is required")
+	}
+
+	_, err := url.Parse(widget.Source)
+
+	if err != nil {
+		return fmt.Errorf("parsing URL: %v", err)
+	}
+
+	if widget.Height == 50 {
+		widget.Height = 300
+	} else if widget.Height < 50 {
+		widget.Height = 50
+	}
+
+	widget.cachedHTML = widget.renderTemplate(widget, iframeWidgetTemplate)
+
+	return nil
+}
+
+func (widget *iframeWidget) Render() template.HTML {
+	return widget.cachedHTML
+}