1 files changed, 214 insertions, 0 deletions
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;
+	}
+}