Allow widgets to handle HTTP requests

internal/glance/glance.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"path/filepath"
 	"regexp"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -24,6 +25,7 @@ type Application struct {
 	Version    string
 	Config     Config
 	slugToPage map[string]*Page
+	widgetByID map[uint64]widget.Widget
 }
 
 type Theme struct {
@@ -106,16 +108,24 @@ func NewApplication(config *Config) (*Application, error) {
 		Version:    buildVersion,
 		Config:     *config,
 		slugToPage: make(map[string]*Page),
+		widgetByID: make(map[uint64]widget.Widget),
 	}
 
 	app.slugToPage[""] = &config.Pages[0]
 
-	for i := range config.Pages {
-		if config.Pages[i].Slug == "" {
-			config.Pages[i].Slug = titleToSlug(config.Pages[i].Title)
+	for p := range config.Pages {
+		if config.Pages[p].Slug == "" {
+			config.Pages[p].Slug = titleToSlug(config.Pages[p].Title)
 		}
 
-		app.slugToPage[config.Pages[i].Slug] = &config.Pages[i]
+		app.slugToPage[config.Pages[p].Slug] = &config.Pages[p]
+
+		for c := range config.Pages[p].Columns {
+			for w := range config.Pages[p].Columns[c].Widgets {
+				widget := config.Pages[p].Columns[c].Widgets[w]
+				app.widgetByID[widget.GetID()] = widget
+			}
+		}
 	}
 
 	return app, nil
@@ -190,6 +200,26 @@ func FileServerWithCache(fs http.FileSystem, cacheDuration time.Duration) http.H
 	})
 }
 
+func (a *Application) HandleWidgetRequest(w http.ResponseWriter, r *http.Request) {
+	widgetValue := r.PathValue("widget")
+
+	widgetID, err := strconv.ParseUint(widgetValue, 10, 64)
+
+	if err != nil {
+		a.HandleNotFound(w, r)
+		return
+	}
+
+	widget, exists := a.widgetByID[widgetID]
+
+	if !exists {
+		a.HandleNotFound(w, r)
+		return
+	}
+
+	widget.HandleRequest(w, r)
+}
+
 func (a *Application) AssetPath(asset string) string {
 	return "/static/" + a.Config.Server.AssetsHash + "/" + asset
 }
@@ -203,7 +233,10 @@ func (a *Application) Serve() error {
 
 	mux.HandleFunc("GET /{$}", a.HandlePageRequest)
 	mux.HandleFunc("GET /{page}", a.HandlePageRequest)
+
 	mux.HandleFunc("GET /api/pages/{page}/content/{$}", a.HandlePageContentRequest)
+	mux.HandleFunc("/api/widgets/{widget}/{path...}", a.HandleWidgetRequest)
+
 	mux.Handle(
 		fmt.Sprintf("GET /static/%s/{path...}", a.Config.Server.AssetsHash),
 		http.StripPrefix("/static/"+a.Config.Server.AssetsHash, FileServerWithCache(http.FS(assets.PublicFS), 8*time.Hour)),

internal/widget/widget.go

@@ -8,6 +8,8 @@ import (
 	"html/template"
 	"log/slog"
 	"math"
+	"net/http"
+	"sync/atomic"
 	"time"
 
 	"github.com/glanceapp/glance/internal/feed"
@@ -15,51 +17,59 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+var uniqueID atomic.Uint64
+
 func New(widgetType string) (Widget, error) {
+	var widget Widget
+
 	switch widgetType {
 	case "calendar":
-		return &Calendar{}, nil
+		widget = &Calendar{}
 	case "clock":
-		return &Clock{}, nil
+		widget = &Clock{}
 	case "weather":
-		return &Weather{}, nil
+		widget = &Weather{}
 	case "bookmarks":
-		return &Bookmarks{}, nil
+		widget = &Bookmarks{}
 	case "iframe":
-		return &IFrame{}, nil
+		widget = &IFrame{}
 	case "html":
-		return &HTML{}, nil
+		widget = &HTML{}
 	case "hacker-news":
-		return &HackerNews{}, nil
+		widget = &HackerNews{}
 	case "releases":
-		return &Releases{}, nil
+		widget = &Releases{}
 	case "videos":
-		return &Videos{}, nil
+		widget = &Videos{}
 	case "markets", "stocks":
-		return &Markets{}, nil
+		widget = &Markets{}
 	case "reddit":
-		return &Reddit{}, nil
+		widget = &Reddit{}
 	case "rss":
-		return &RSS{}, nil
+		widget = &RSS{}
 	case "monitor":
-		return &Monitor{}, nil
+		widget = &Monitor{}
 	case "twitch-top-games":
-		return &TwitchGames{}, nil
+		widget = &TwitchGames{}
 	case "twitch-channels":
-		return &TwitchChannels{}, nil
+		widget = &TwitchChannels{}
 	case "lobsters":
-		return &Lobsters{}, nil
+		widget = &Lobsters{}
 	case "change-detection":
-		return &ChangeDetection{}, nil
+		widget = &ChangeDetection{}
 	case "repository":
-		return &Repository{}, nil
+		widget = &Repository{}
 	case "search":
-		return &Search{}, nil
+		widget = &Search{}
 	case "extension":
-		return &Extension{}, nil
+		widget = &Extension{}
 	default:
 		return nil, fmt.Errorf("unknown widget type: %s", widgetType)
 	}
+
+	widget.SetID(uniqueID.Add(1))
+
+	return widget, nil
 }
 
 type Widgets []Widget
@@ -90,7 +100,7 @@ func (w *Widgets) UnmarshalYAML(node *yaml.Node) error {
 			return err
 		}
 
-		if err = widget.Initialize(); err != nil {
+		if err := widget.Initialize(); err != nil {
 			return err
 		}
 
@@ -106,6 +116,9 @@ type Widget interface {
 	Update(context.Context)
 	Render() template.HTML
 	GetType() string
+	GetID() uint64
+	SetID(uint64)
+	HandleRequest(w http.ResponseWriter, r *http.Request)
 }
 
 type cacheType int
@@ -117,6 +130,7 @@ const (
 )
 
 type widgetBase struct {
+	ID                  uint64        `yaml:"-"`
 	Type                string        `yaml:"type"`
 	Title               string        `yaml:"title"`
 	TitleURL            string        `yaml:"title-url"`
@@ -148,6 +162,18 @@ func (w *widgetBase) Update(ctx context.Context) {
 
 }
 
+func (w *widgetBase) GetID() uint64 {
+	return w.ID
+}
+
+func (w *widgetBase) SetID(id uint64) {
+	w.ID = id
+}
+
+func (widget *widgetBase) HandleRequest(w http.ResponseWriter, r *http.Request) {
+	http.Error(w, "not implemented", http.StatusNotImplemented)
+}
+
 func (w *widgetBase) GetType() string {
 	return w.Type
 }