webassets, client: embed assets in compiled binary

Go 1.16 introduced the embed library, which allows for embedding files
into the compiled binary. This simplifies deployment as only the
executable is required on the host, without any separate web assets
folders.

This patch applies this change to the client and webassets directories.

Dockerfile

@@ -34,9 +34,7 @@ RUN chmod 777 /config; \
 
 WORKDIR /api
 COPY --from=builder /api/app .
-COPY client ./client
-COPY webassets ./webassets
 
 EXPOSE 8080
 
-ENTRYPOINT ["./app"]
+ENTRYPOINT ["./app"]

docs/ubuntu-install.md

@@ -31,8 +31,6 @@ git clone --depth 1 https://github.com/akhilrex/podgrab
 ``` bash
 cd podgrab
 mkdir -p ./dist
-cp -r client ./dist
-cp -r webassets ./dist
 cp .env ./dist
 go build -o ./dist/podgrab ./main.go
 ```

main.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"embed"
 	"fmt"
 	"html/template"
+	"io/fs"
 	"log"
+	"net/http"
 	"os"
 	"path"
 	"strconv"
@@ -18,6 +21,13 @@ import (
 	_ "github.com/joho/godotenv/autoload"
 )
 
+var (
+	//go:embed client
+	clientEmbed embed.FS
+	//go:embed webassets
+	webAssetsEmbed embed.FS
+)
+
 func main() {
 	var err error
 	db.DB, err = db.Init()
@@ -127,7 +137,7 @@ func main() {
 			return fmt.Sprintf("%02d:%02d", mins, secs)
 		},
 	}
-	tmpl := template.Must(template.New("main").Funcs(funcMap).ParseGlob("client/*"))
+	tmpl := template.Must(template.New("main").Funcs(funcMap).ParseFS(clientEmbed, "client/*"))
 
 	//r.LoadHTMLGlob("client/*")
 	r.SetHTMLTemplate(tmpl)
@@ -145,7 +155,12 @@ func main() {
 	dataPath := os.Getenv("DATA")
 	backupPath := path.Join(os.Getenv("CONFIG"), "backups")
 
-	router.Static("/webassets", "./webassets")
+	webAssets, err := fs.Sub(webAssetsEmbed, "webassets")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	router.StaticFS("/webassets", http.FS(webAssets))
 	router.Static("/assets", dataPath)
 	router.Static(backupPath, backupPath)
 	router.POST("/podcasts", controllers.AddPodcast)