embed the frontend over carrying it along with the exe everywhere

internal/api/handlers.go

@@ -4,12 +4,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/fs"
 	"log"
 	"net/http"
 	"strconv"
 	"strings"
 
 	metrics "github.com/canonical/gocert/internal/metrics"
+	"github.com/canonical/gocert/ui"
 )
 
 // NewGoCertRouter takes in an environment struct, passes it along to any handlers that will need
@@ -26,7 +28,7 @@ func NewGoCertRouter(env *Environment) http.Handler {
 	apiV1Router.HandleFunc("DELETE /certificate_requests/{id}/certificate", DeleteCertificate(env))
 
 	metricsHandler := metrics.NewPrometheusMetricsHandler()
-	frontendHandler := newFrontendFileServer(env.FrontendDir)
+	frontendHandler := newFrontendFileServer()
 
 	router := http.NewServeMux()
 	router.HandleFunc("/status", HealthCheck)
@@ -37,8 +39,12 @@ func NewGoCertRouter(env *Environment) http.Handler {
 	return logging(router)
 }
 
-func newFrontendFileServer(dir string) http.Handler {
-	return http.FileServer(http.Dir(dir))
+func newFrontendFileServer() http.Handler {
+	frontendFS, err := fs.Sub(ui.FrontendFS, "out")
+	if err != nil {
+		log.Fatal(err)
+	}
+	return http.FileServer(http.FS(frontendFS))
 }
 
 // the health check endpoint simply returns a http.StatusOK

internal/api/server.go

@@ -22,16 +22,14 @@ type ConfigYAML struct {
 }
 
 type Config struct {
-	Key         []byte
-	Cert        []byte
-	DBPath      string
-	FrontendDir string
-	Port        int
+	Key    []byte
+	Cert   []byte
+	DBPath string
+	Port   int
 }
 
 type Environment struct {
-	DB          *certdb.CertificateRequestsRepository
-	FrontendDir string
+	DB *certdb.CertificateRequestsRepository
 }
 
 // validateConfigFile opens and processes the given yaml file, and catches errors in the process
@@ -67,7 +65,6 @@ func validateConfigFile(filePath string) (Config, error) {
 	config.Key = key
 	config.DBPath = c.DBPath
 	config.Port = c.Port
-	config.FrontendDir = "ui/out"
 	return config, nil
 }
 
@@ -88,7 +85,6 @@ func NewServer(configFile string) (*http.Server, error) {
 
 	env := &Environment{}
 	env.DB = db
-	env.FrontendDir = config.FrontendDir
 	router := NewGoCertRouter(env)
 
 	s := &http.Server{

ui/embed.go

@@ -0,0 +1,6 @@
+package ui
+
+import "embed"
+
+//go:embed all:out
+var FrontendFS embed.FS