diff --git a/api/src/util/instanceOf.ts b/api/src/util/instanceOf.ts
new file mode 100644
index 00000000..4d9034e5
--- /dev/null
+++ b/api/src/util/instanceOf.ts
@@ -0,0 +1,214 @@
+// different version of lambert-server instanceOf with discord error format
+
+import { NextFunction, Request, Response } from "express";
+import { Tuple } from "lambert-server";
+import "missing-native-js-functions";
+
+export const OPTIONAL_PREFIX = "$";
+export const EMAIL_REGEX =
+ /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
+
+export function check(schema: any) {
+ return (req: Request, res: Response, next: NextFunction) => {
+ try {
+ const result = instanceOf(schema, req.body, { path: "body", req, ref: { obj: null, key: "" } });
+ if (result === true) return next();
+ throw result;
+ } catch (error) {
+ return res.status(400).json({ code: 50035, message: "Invalid Form Body", success: false, errors: error });
+ }
+ };
+}
+
+export function FieldErrors(fields: Record<string, { code?: string; message: string }>) {
+ return new FieldError(
+ 50035,
+ "Invalid Form Body",
+ fields.map(({ message, code }) => ({
+ _errors: [
+ {
+ message,
+ code: code || "BASE_TYPE_INVALID"
+ }
+ ]
+ }))
+ );
+}
+
+// TODO: implement Image data type: Data URI scheme that supports JPG, GIF, and PNG formats. An example Data URI format is: data:image/jpeg;base64,BASE64_ENCODED_JPEG_IMAGE_DATA
+// Ensure you use the proper content type (image/jpeg, image/png, image/gif) that matches the image data being provided.
+
+export class FieldError extends Error {
+ constructor(public code: string | number, public message: string, public errors?: any) {
+ super(message);
+ }
+}
+
+export class Email {
+ constructor(public email: string) {}
+ check() {
+ return !!this.email.match(EMAIL_REGEX);
+ }
+}
+
+export class Length {
+ constructor(public type: any, public min: number, public max: number) {}
+
+ check(value: string) {
+ if (typeof value === "string" || Array.isArray(value)) return value.length >= this.min && value.length <= this.max;
+ if (typeof value === "number" || typeof value === "bigint") return value >= this.min && value <= this.max;
+ return false;
+ }
+}
+
+export function instanceOf(
+ type: any,
+ value: any,
+ {
+ path = "",
+ optional = false,
+ errors = {},
+ req,
+ ref
+ }: { path?: string; optional?: boolean; errors?: any; req: Request; ref?: { key: string | number; obj: any } }
+): Boolean {
+ if (!ref) ref = { obj: null, key: "" };
+ if (!path) path = "body";
+ if (!type) return true; // no type was specified
+
+ try {
+ if (value == null) {
+ if (optional) return true;
+ throw new FieldError("BASE_TYPE_REQUIRED", req.t("common:field.BASE_TYPE_REQUIRED"));
+ }
+
+ switch (type) {
+ case String:
+ value = `${value}`;
+ ref.obj[ref.key] = value;
+ if (typeof value === "string") return true;
+ throw new FieldError("BASE_TYPE_STRING", req.t("common:field.BASE_TYPE_STRING"));
+ case Number:
+ value = Number(value);
+ ref.obj[ref.key] = value;
+ if (typeof value === "number" && !isNaN(value)) return true;
+ throw new FieldError("BASE_TYPE_NUMBER", req.t("common:field.BASE_TYPE_NUMBER"));
+ case BigInt:
+ try {
+ value = BigInt(value);
+ ref.obj[ref.key] = value;
+ if (typeof value === "bigint") return true;
+ } catch (error) {}
+ throw new FieldError("BASE_TYPE_BIGINT", req.t("common:field.BASE_TYPE_BIGINT"));
+ case Boolean:
+ if (value == "true") value = true;
+ if (value == "false") value = false;
+ ref.obj[ref.key] = value;
+ if (typeof value === "boolean") return true;
+ throw new FieldError("BASE_TYPE_BOOLEAN", req.t("common:field.BASE_TYPE_BOOLEAN"));
+
+ case Email:
+ if (new Email(value).check()) return true;
+ throw new FieldError("EMAIL_TYPE_INVALID_EMAIL", req.t("common:field.EMAIL_TYPE_INVALID_EMAIL"));
+ case Date:
+ value = new Date(value);
+ ref.obj[ref.key] = value;
+ // value.getTime() can be < 0, if it is before 1970
+ if (!isNaN(value)) return true;
+ throw new FieldError("DATE_TYPE_PARSE", req.t("common:field.DATE_TYPE_PARSE"));
+ }
+
+ if (typeof type === "object") {
+ if (Array.isArray(type)) {
+ if (!Array.isArray(value)) throw new FieldError("BASE_TYPE_ARRAY", req.t("common:field.BASE_TYPE_ARRAY"));
+ if (!type.length) return true; // type array didn't specify any type
+
+ return (
+ value.every((val, i) => {
+ errors[i] = {};
+
+ if (
+ instanceOf(type[0], val, {
+ path: `${path}[${i}]`,
+ optional,
+ errors: errors[i],
+ req,
+ ref: { key: i, obj: value }
+ }) === true
+ ) {
+ delete errors[i];
+ return true;
+ }
+
+ return false;
+ }) || errors
+ );
+ } else if (type?.constructor?.name != "Object") {
+ if (type instanceof Tuple) {
+ if ((<Tuple>type).types.some((x) => instanceOf(x, value, { path, optional, errors, req, ref }))) return true;
+ throw new FieldError("BASE_TYPE_CHOICES", req.t("common:field.BASE_TYPE_CHOICES", { types: type.types }));
+ } else if (type instanceof Length) {
+ let length = <Length>type;
+ if (instanceOf(length.type, value, { path, optional, req, ref, errors }) !== true) return errors;
+ let val = ref.obj[ref.key];
+ if ((<Length>type).check(val)) return true;
+ throw new FieldError(
+ "BASE_TYPE_BAD_LENGTH",
+ req.t("common:field.BASE_TYPE_BAD_LENGTH", {
+ length: `${type.min} - ${type.max}`
+ })
+ );
+ }
+ try {
+ if (value instanceof type) return true;
+ } catch (error) {
+ throw new FieldError("BASE_TYPE_CLASS", req.t("common:field.BASE_TYPE_CLASS", { type }));
+ }
+ }
+
+ if (typeof value !== "object") throw new FieldError("BASE_TYPE_OBJECT", req.t("common:field.BASE_TYPE_OBJECT"));
+
+ const diff = Object.keys(value).missing(
+ Object.keys(type).map((x) => (x.startsWith(OPTIONAL_PREFIX) ? x.slice(OPTIONAL_PREFIX.length) : x))
+ );
+
+ if (diff.length) throw new FieldError("UNKOWN_FIELD", req.t("common:field.UNKOWN_FIELD", { key: diff }));
+
+ return (
+ Object.keys(type).every((key) => {
+ let newKey = key;
+ const OPTIONAL = key.startsWith(OPTIONAL_PREFIX);
+ if (OPTIONAL) newKey = newKey.slice(OPTIONAL_PREFIX.length);
+ errors[newKey] = {};
+
+ if (
+ instanceOf(type[key], value[newKey], {
+ path: `${path}.${newKey}`,
+ optional: OPTIONAL,
+ errors: errors[newKey],
+ req,
+ ref: { key: newKey, obj: value }
+ }) === true
+ ) {
+ delete errors[newKey];
+ return true;
+ }
+
+ return false;
+ }) || errors
+ );
+ } else if (typeof type === "number" || typeof type === "string" || typeof type === "boolean") {
+ if (value === type) return true;
+ throw new FieldError("BASE_TYPE_CONSTANT", req.t("common:field.BASE_TYPE_CONSTANT", { value: type }));
+ } else if (typeof type === "bigint") {
+ if (BigInt(value) === type) return true;
+ throw new FieldError("BASE_TYPE_CONSTANT", req.t("common:field.BASE_TYPE_CONSTANT", { value: type }));
+ }
+
+ return type == value;
+ } catch (error) {
+ let e = error as FieldError;
+ errors._errors = [{ message: e.message, code: e.code }];
+ return errors;
+ }
+}
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