Add extension widget

internal/widget/extension.go

@@ -0,0 +1,59 @@
+package widget
+
+import (
+	"context"
+	"errors"
+	"html/template"
+	"net/url"
+	"time"
+
+	"github.com/glanceapp/glance/internal/assets"
+	"github.com/glanceapp/glance/internal/feed"
+)
+
+type Extension struct {
+	widgetBase `yaml:",inline"`
+	URL        string            `yaml:"url"`
+	Parameters map[string]string `yaml:"parameters"`
+	AllowHtml  bool              `yaml:"allow-potentially-dangerous-html"`
+	Extension  feed.Extension    `yaml:"-"`
+	cachedHTML template.HTML     `yaml:"-"`
+}
+
+func (widget *Extension) Initialize() error {
+	widget.withTitle("Extension").withCacheDuration(time.Minute * 30)
+
+	if widget.URL == "" {
+		return errors.New("no extension URL specified")
+	}
+
+	_, err := url.Parse(widget.URL)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (widget *Extension) Update(ctx context.Context) {
+	extension, err := feed.FetchExtension(feed.ExtensionRequestOptions{
+		URL:        widget.URL,
+		Parameters: widget.Parameters,
+		AllowHtml:  widget.AllowHtml,
+	})
+
+	widget.canContinueUpdateAfterHandlingErr(err)
+
+	widget.Extension = extension
+
+	if extension.Title != "" {
+		widget.Title = extension.Title
+	}
+
+	widget.cachedHTML = widget.render(widget, assets.ExtensionTemplate)
+}
+
+func (widget *Extension) Render() template.HTML {
+	return widget.cachedHTML
+}