From dbd19d590c5b321060ad1aeaa127ac003f10eacc Mon Sep 17 00:00:00 2001
From: Fabian Vowie <fabian@vowie.me>
Date: Mon, 17 Jan 2022 12:07:38 +0100
Subject: [PATCH] Load settings on program start or create default if none
 exist

---
 main.go              | 12 ++++++++++--
 settings/settings.go | 33 ++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/main.go b/main.go
index aef8790..94a9017 100644
--- a/main.go
+++ b/main.go
@@ -5,6 +5,7 @@ import (
 	"net/http"
 
 	"github.com/geplauder/lithium/pipelines"
+	"github.com/geplauder/lithium/settings"
 	"github.com/geplauder/lithium/storage"
 	"github.com/gorilla/mux"
 )
@@ -42,10 +43,17 @@ func RegisterPipelineRoutes(r *mux.Router, pipelines []pipelines.IPipeline, stor
 }
 
 func main() {
-	storageProvider := storage.GetFileSystemStorageProvider("test")
+	settings := settings.LoadSettings()
 
+	var storageProvider storage.IStorageProvider
 	storageProvider.StoreRaw("abc", "def.test", []byte{0x12, 0x10})
 
+	if settings.FileSystem.Type == 0 {
+		storageProvider = storage.GetFileSystemStorageProvider(settings.FileSystem.BasePath)
+	} else {
+		panic("Invalid file system provided!")
+	}
+
 	pipes := pipelines.LoadPipelines()
 
 	r := mux.NewRouter()
@@ -53,7 +61,7 @@ func main() {
 
 	RegisterPipelineRoutes(r, pipes, storageProvider)
 
-	err := http.ListenAndServe(":8000", r)
+	err := http.ListenAndServe(settings.Endpoint, r)
 	if err != nil {
 		panic(err)
 	}
diff --git a/settings/settings.go b/settings/settings.go
index 6e88584..6239703 100644
--- a/settings/settings.go
+++ b/settings/settings.go
@@ -1,6 +1,10 @@
 package settings
 
-import "encoding/json"
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
 
 const (
 	Local FileSystemType = iota
@@ -26,3 +30,30 @@ func ParseSettings(data []byte) Settings {
 
 	return settings
 }
+
+func LoadSettings() Settings {
+	workingDirectory, _ := os.Getwd()
+	path := filepath.Join(workingDirectory, "settings.json")
+
+	// Load file and parse file
+	data, err := os.ReadFile(path)
+
+	if err == nil {
+		return ParseSettings(data)
+	}
+
+	// If file does not exist, create default settings
+	defaultSettings := Settings{
+		Endpoint: "127.0.0.1:8000",
+		Token:    "changeme",
+		FileSystem: FileSystemSettings{
+			Type:     Local,
+			BasePath: "assets",
+		},
+	}
+
+	serializedSettings, err := json.Marshal(defaultSettings)
+	os.WriteFile(path, serializedSettings, os.ModePerm)
+
+	return defaultSettings
+}