Add custom API widget

internal/widget/custom-api.go

@@ -0,0 +1,70 @@
+package widget
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"html/template"
+	"net/http"
+	"time"
+
+	"github.com/glanceapp/glance/internal/assets"
+	"github.com/glanceapp/glance/internal/feed"
+)
+
+type CustomApi struct {
+	widgetBase       `yaml:",inline"`
+	URL              string                       `yaml:"url"`
+	Template         string                       `yaml:"template"`
+	Frameless        bool                         `yaml:"frameless"`
+	Headers          map[string]OptionalEnvString `yaml:"headers"`
+	APIRequest       *http.Request                `yaml:"-"`
+	compiledTemplate *template.Template           `yaml:"-"`
+	CompiledHTML     template.HTML                `yaml:"-"`
+}
+
+func (widget *CustomApi) Initialize() error {
+	widget.withTitle("Custom API").withCacheDuration(1 * time.Hour)
+
+	if widget.URL == "" {
+		return errors.New("URL is required for the custom API widget")
+	}
+
+	if widget.Template == "" {
+		return errors.New("template is required for the custom API widget")
+	}
+
+	compiledTemplate, err := template.New("").Funcs(feed.CustomAPITemplateFuncs).Parse(widget.Template)
+
+	if err != nil {
+		return fmt.Errorf("failed parsing custom API widget template: %w", err)
+	}
+
+	widget.compiledTemplate = compiledTemplate
+
+	req, err := http.NewRequest(http.MethodGet, widget.URL, nil)
+	if err != nil {
+		return err
+	}
+
+	for key, value := range widget.Headers {
+		req.Header.Add(key, value.String())
+	}
+
+	widget.APIRequest = req
+
+	return nil
+}
+
+func (widget *CustomApi) Update(ctx context.Context) {
+	compiledHTML, err := feed.FetchAndParseCustomAPI(widget.APIRequest, widget.compiledTemplate)
+	if !widget.canContinueUpdateAfterHandlingErr(err) {
+		return
+	}
+
+	widget.CompiledHTML = compiledHTML
+}
+
+func (widget *CustomApi) Render() template.HTML {
+	return widget.render(widget, assets.CustomAPITemplate)
+}

internal/widget/widget.go

@@ -69,6 +69,8 @@ func New(widgetType string) (Widget, error) {
 		widget = &DNSStats{}
 	case "split-column":
 		widget = &SplitColumn{}
+	case "custom-api":
+		widget = &CustomApi{}
 	default:
 		return nil, fmt.Errorf("unknown widget type: %s", widgetType)
 	}