package main import ( "fmt" "html/template" "log" "net/http" "os" "path/filepath" "gopkg.in/yaml.v3" ) // --- Config types --- type ServerConfig struct { Port int `yaml:"port"` Host string `yaml:"host"` } type AppConfig struct { Name string `yaml:"name"` Description string `yaml:"description"` } type Config struct { Server ServerConfig `yaml:"server"` App AppConfig `yaml:"app"` } type AppEntry struct { Name string `yaml:"name"` Subtitle string `yaml:"subtitle"` URL string `yaml:"url"` Icon string `yaml:"icon"` } type AppsFile struct { Apps []AppEntry `yaml:"apps"` } // --- Config loading --- func loadConfig(configDir string) (*Config, error) { path := filepath.Join(configDir, "config.yaml") data, err := os.ReadFile(path) if err != nil { return nil, fmt.Errorf("reading config: %w", err) } var cfg Config if err := yaml.Unmarshal(data, &cfg); err != nil { return nil, fmt.Errorf("parsing config: %w", err) } return &cfg, nil } func loadApps(configDir string) ([]AppEntry, error) { path := filepath.Join(configDir, "apps.yaml") data, err := os.ReadFile(path) if err != nil { if os.IsNotExist(err) { return []AppEntry{}, nil } return nil, fmt.Errorf("reading apps: %w", err) } var appsFile AppsFile if err := yaml.Unmarshal(data, &appsFile); err != nil { return nil, fmt.Errorf("parsing apps: %w", err) } return appsFile.Apps, nil } // --- Handlers --- func healthHandler(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) fmt.Fprint(w, "OK") } func launcherHandler(cfg *Config, apps []AppEntry) http.HandlerFunc { tmpl := template.Must(template.New("launcher").Parse(launcherHTML)) return func(w http.ResponseWriter, r *http.Request) { user := r.Header.Get("X-Forwarded-User") data := struct { AppName string Description string User string LoggedIn bool Apps []AppEntry }{ AppName: cfg.App.Name, Description: cfg.App.Description, User: user, LoggedIn: user != "", Apps: apps, } w.Header().Set("Content-Type", "text/html; charset=utf-8") tmpl.Execute(w, data) } } // --- Main --- func main() { configDir := os.Getenv("CONFIG_DIR") if configDir == "" { configDir = "/opt/nextworkspace/config/nextworkspace" } cfg, err := loadConfig(configDir) if err != nil { log.Fatalf("Failed to load config: %v", err) } apps, err := loadApps(configDir) if err != nil { log.Fatalf("Failed to load apps: %v", err) } addr := fmt.Sprintf("%s:%d", cfg.Server.Host, cfg.Server.Port) mux := http.NewServeMux() mux.HandleFunc("/health", healthHandler) mux.HandleFunc("/", launcherHandler(cfg, apps)) log.Printf("NextWorkspace launcher listening on %s", addr) log.Fatal(http.ListenAndServe(addr, mux)) } const launcherHTML = ` {{.AppName}}

{{end}} `

Welcome to {{.AppName}}

{{.Name}}