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// different version of lambert-server instanceOf with discord error format
import { NextFunction, Request, Response } from "express";
import { Tuple } from "lambert-server";
const OPTIONAL_PREFIX = "$";
export function check(schema: any) {
return (req: Request, res: Response, next: NextFunction) => {
try {
const result = instanceOf(schema, req.body, { path: "body" });
if (result === true) return next();
throw result;
} catch (error) {
return res.status(400).json({ code: 50035, message: "Invalid Form Body", success: false, errors: error });
}
};
}
class FieldError extends Error {
constructor(public code: string, public message: string) {
super(message);
}
}
export function instanceOf(
type: any,
value: any,
{ path = "", optional = false, errors = {} }: { path?: string; optional?: boolean; errors?: any } = {}
): Boolean {
try {
if (!type) return true; // no type was specified
if (value == null) {
if (optional) return true;
throw new FieldError("BASE_TYPE_REQUIRED", `This field is required`);
}
switch (type) {
case String:
if (typeof value === "string") return true;
throw new FieldError("BASE_TYPE_STRING", `This field must be a string`);
case Number:
value = Number(value);
if (typeof value === "number" && !isNaN(value)) return true;
throw new FieldError("BASE_TYPE_NUMBER", `This field must be a number`);
case BigInt:
try {
value = BigInt(value);
if (typeof value === "bigint") return true;
} catch (error) {}
throw new FieldError("BASE_TYPE_BIGINT", `This field must be a bigint`);
case Boolean:
if (value == "true") value = true;
if (value == "false") value = false;
if (typeof value === "boolean") return true;
throw new FieldError("BASE_TYPE_BOOLEAN", `This field must be a boolean`);
}
if (typeof type === "object") {
if (type?.constructor?.name != "Object") {
if (type instanceof Tuple) {
if ((<Tuple>type).types.some((x) => instanceOf(x, value, { path, optional, errors }))) return true;
throw new FieldError("BASE_TYPE_CHOICES", `This field must be one of (${type.types})`);
}
if (value instanceof type) return true;
throw new FieldError("BASE_TYPE_CLASS", `This field must be an instance of ${type}`);
}
if (typeof value !== "object") throw new FieldError("BASE_TYPE_OBJECT", `This field must be a object`);
if (Array.isArray(type)) {
if (!Array.isArray(value)) throw new FieldError("BASE_TYPE_ARRAY", `This field must be an array`);
if (!type.length) return true; // type array didn't specify any type
return (
value.every((val, i) => {
errors[i] = {};
return (
instanceOf(type[0], val, { path: `${path}[${i}]`, optional, errors: errors[i] }) === true
);
}) || errors
);
}
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", `Unkown key ${diff}`);
return (
Object.keys(type).every((key) => {
let newKey = key;
const OPTIONAL = key.startsWith(OPTIONAL_PREFIX);
if (OPTIONAL) newKey = newKey.slice(OPTIONAL_PREFIX.length);
errors[key] = {};
return (
instanceOf(type[key], value[newKey], {
path: `${path}.${newKey}`,
optional: OPTIONAL,
errors: errors[key],
}) === true
);
}) || errors
);
} else if (typeof type === "number" || typeof type === "string" || typeof type === "boolean") {
if (value === type) return true;
throw new FieldError("BASE_TYPE_CONSTANT", `This field must be ${value}`);
} else if (typeof type === "bigint") {
if (BigInt(value) === type) return true;
throw new FieldError("BASE_TYPE_CONSTANT", `This field must be ${value}`);
}
return type == value;
} catch (error) {
let e = error as FieldError;
errors._errors = [{ message: e.message, code: e.code }];
return errors;
}
}
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