add user scripting with lua

scripts.go

@@ -0,0 +1,94 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+
+	"github.com/Shopify/go-lua"
+	"github.com/Shopify/goluago/util"
+)
+
+var networkFunctions = []lua.RegistryFunction{
+	{Name: "get", Function: func(l *lua.State) int {
+		url := lua.CheckString(l, 1)
+
+		req, err := http.NewRequest("GET", url, nil)
+		if err != nil {
+			lua.Errorf(l, "unable to build new request: %s", err.Error())
+			return 0
+		}
+
+		if !l.IsNil(2) {
+			headers, err := util.PullStringTable(l, 2)
+			if err != nil {
+				lua.Errorf(l, "unable to acces headers table: %s", err.Error())
+				return 0
+			}
+			for key, value := range headers {
+				req.Header.Set(key, value)
+			}
+		}
+
+		resp, err := http.DefaultClient.Do(req)
+		if err != nil {
+			lua.Errorf(l, "error fetching: %s", err.Error())
+			return 0
+		}
+		defer resp.Body.Close()
+		b, err := io.ReadAll(resp.Body)
+		if err != nil {
+			lua.Errorf(l, "error reading body: %s", err.Error())
+			return 0
+		}
+		l.PushString(string(b))
+		l.PushInteger(resp.StatusCode)
+
+		return 2
+	}},
+}
+
+var jsonFunctions = []lua.RegistryFunction{
+	{Name: "decode", Function: func(l *lua.State) int {
+		payload := lua.CheckString(l, 1)
+		var output any
+		if err := json.Unmarshal([]byte(payload), &output); err != nil {
+			lua.Errorf(l, "error parsing json: %s", err.Error())
+			return 0
+		}
+		return util.DeepPush(l, output)
+	}},
+}
+
+func RunScript(fileName string, token string) (string, error) {
+	l := lua.NewState()
+	lua.OpenLibraries(l)
+	lua.Require(l, "http", func(state *lua.State) int {
+		lua.NewLibrary(l, networkFunctions)
+		return 1
+
+	}, true)
+
+	lua.Require(l, "json", func(state *lua.State) int {
+		lua.NewLibrary(l, jsonFunctions)
+		return 1
+	}, false)
+	err := lua.DoFile(l, fileName)
+	if err != nil {
+		return "", err
+	}
+	l.Global("get_user_info")
+	l.PushString(token)
+	err = l.ProtectedCall(1, 1, 0)
+	if err != nil {
+		return "", err
+	}
+
+	myStr, ok := l.ToString(-1)
+	if !ok {
+		return "", errors.New("unable to get function result as string")
+	}
+	return myStr, nil
+
+}