feat: request and time mod payload

spire.go

@@ -1,7 +1,59 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"time"
+)
+
+const TMPDIR = "/tmp/spire"
+const PAYLOAD = TMPDIR + "/payload.json"
 
 func main() {
-	fmt.Println("hello hi")
+	get_cache()
+}
+
+func get_cache() error {
+	info, err := os.Stat(PAYLOAD)
+
+	if err != nil {
+		fmt.Println("payload isn't accessible, requesting")
+		download_cache()
+	} else if !(info.ModTime().After(time.Now().Add(-2 * time.Hour))) {
+		download_cache()
+	} else {
+		fmt.Println("payload was updated recently, won't update")
+	}
+
+	return nil
+}
+
+func download_cache() error {
+	resp, err := http.Get("https://thunderstore.io/api/v1/package/")
+	if err != nil {
+		log.Fatal("couldn't download thunderstore payload")
+		return err
+	}
+	defer resp.Body.Close()
+
+	if err := os.MkdirAll(TMPDIR, os.ModePerm); err != nil {
+		log.Fatal("couldn't create tmpdir")
+		return err
+	}
+	out, err := os.Create(PAYLOAD)
+	if err != nil {
+		log.Fatal("couldn't create payload file")
+		return err
+	}
+	defer out.Close()
+
+	if _, err := io.Copy(out, resp.Body); err != nil {
+		log.Fatal("couldn't write to payload file")
+		return err
+	}
+
+	return nil
 }