487 lines
14 KiB
TypeScript
487 lines
14 KiB
TypeScript
import Model, {ModelType} from "./Model";
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import ModelQuery, {WhereTest} from "./ModelQuery";
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import {Connection} from "mysql";
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import {ServerError} from "../HttpError";
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export const EMAIL_REGEX = /^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+$/;
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export default class Validator<V> {
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public static async validate(
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validationMap: { [p: string]: Validator<unknown> },
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body: { [p: string]: unknown },
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): Promise<void> {
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const bag = new ValidationBag();
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for (const p of Object.keys(validationMap)) {
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try {
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await validationMap[p].execute(p, body[p], false);
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} catch (e) {
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if (e instanceof ValidationBag) {
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bag.addBag(e);
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} else throw e;
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}
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}
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if (bag.hasMessages()) throw bag;
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}
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private readonly steps: ValidationStep<V>[] = [];
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private readonly validationAttributes: string[] = [];
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private readonly rawValueToHuman?: (val: V) => string;
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private _min?: number;
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private _max?: number;
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public constructor(rawValueToHuman?: (val: V) => string) {
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this.rawValueToHuman = rawValueToHuman;
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}
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/**
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* @param thingName The name of the thing to validate.
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* @param value The value to verify.
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* @param onlyFormat {@code true} to only validate format properties, {@code false} otherwise.
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* @param connection A connection to use in case of wrapped transactions.
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*/
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public async execute(
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thingName: string,
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value: V | undefined,
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onlyFormat: boolean,
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connection?: Connection,
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): Promise<void> {
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const bag = new ValidationBag<V>();
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for (const step of this.steps) {
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if (onlyFormat && !step.isFormat) continue;
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let result;
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try {
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result = step.verifyStep(value, thingName, connection);
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if (result instanceof Promise) {
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result = await result;
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}
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} catch (e) {
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throw new ServerError(`An error occurred while validating ${thingName} with value "${value}".`, e);
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}
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if (result === false && step.throw) {
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const error: ValidationError<V> = step.throw();
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error.rawValueToHuman = this.rawValueToHuman;
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error.thingName = thingName;
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error.value = value;
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bag.addMessage(error);
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break;
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} else if (step.interrupt !== undefined && step.interrupt(value)) {
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break;
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}
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}
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if (bag.hasMessages()) {
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throw bag;
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}
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}
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public defined(): Validator<V> {
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this.validationAttributes.push('required');
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this.addStep({
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verifyStep: val => val !== undefined,
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throw: () => new UndefinedValueValidationError(),
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isFormat: true,
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});
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return this;
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}
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public acceptUndefined(alsoAcceptEmptyString: boolean = false): Validator<V> {
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this.addStep({
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verifyStep: () => true,
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throw: null,
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interrupt: val => {
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return val === undefined ||
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val === null ||
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alsoAcceptEmptyString && typeof val === 'string' && val.length === 0;
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},
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isFormat: true,
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});
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return this;
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}
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public equals(other?: V): Validator<V> {
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this.addStep({
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verifyStep: val => val === other,
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throw: () => new BadValueValidationError(other),
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isFormat: true,
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});
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return this;
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}
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public sameAs(otherName?: string, other?: V): Validator<V> {
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this.addStep({
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verifyStep: val => val === other,
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throw: () => new DifferentThanError(otherName),
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isFormat: true,
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});
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return this;
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}
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public regexp(regexp: RegExp): Validator<V> {
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this.validationAttributes.push(`pattern="${regexp}"`);
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this.addStep({
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verifyStep: val => regexp.test(<string><unknown>val),
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throw: () => new InvalidFormatValidationError(),
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isFormat: true,
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});
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return this;
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}
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public length(length: number): Validator<V> {
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this.addStep({
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verifyStep: val => isLenghtable(val) && val.length === length,
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throw: () => new BadLengthValidationError(length),
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isFormat: true,
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});
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return this;
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}
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/**
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* @param minLength included
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*/
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public minLength(minLength: number): Validator<V> {
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this.addStep({
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verifyStep: val => isLenghtable(val) && val.length >= minLength,
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throw: () => new TooShortError(minLength),
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isFormat: true,
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});
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return this;
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}
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/**
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* @param maxLength included
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*/
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public maxLength(maxLength: number): Validator<V> {
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this.addStep({
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verifyStep: val => isLenghtable(val) && val.length <= maxLength,
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throw: () => new TooLongError(maxLength),
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isFormat: true,
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});
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return this;
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}
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/**
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* @param minLength included
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* @param maxLength included
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*/
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public between(minLength: number, maxLength: number): Validator<V> {
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this.addStep({
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verifyStep: val => {
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return isLenghtable(val) &&
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val.length >= minLength && val.length <= maxLength;
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},
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throw: () => new BadLengthValidationError(minLength, maxLength),
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isFormat: true,
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});
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return this;
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}
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/**
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* @param min included
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*/
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public min(min: number): Validator<V> {
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this.validationAttributes.push(`min="${min}"`);
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this._min = min;
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this.addStep({
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verifyStep: val => {
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return typeof val === 'number' && val >= min;
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},
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throw: () => new OutOfRangeValidationError(this._min, this._max),
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isFormat: true,
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});
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return this;
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}
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/**
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* @param max included
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*/
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public max(max: number): Validator<V> {
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this.validationAttributes.push(`max="${max}"`);
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this._max = max;
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this.addStep({
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verifyStep: val => {
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return typeof val === 'number' && val <= max;
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},
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throw: () => new OutOfRangeValidationError(this._min, this._max),
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isFormat: true,
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});
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return this;
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}
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public unique<M extends Model>(
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model: M | ModelType<M>,
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foreignKey?: string,
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querySupplier?: () => ModelQuery<M>,
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): Validator<V> {
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this.addStep({
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verifyStep: async (val, thingName, c) => {
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if (!foreignKey) foreignKey = thingName;
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let query: ModelQuery<M>;
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if (querySupplier) {
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query = querySupplier();
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} else {
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query = (model instanceof Model ? <ModelType<M>>model.constructor : model).select('');
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}
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query.where(foreignKey, val);
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if (model instanceof Model && typeof model.id === 'number')
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query = query.where('id', model.id, WhereTest.NE);
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return (await query.execute(c)).results.length === 0;
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},
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throw: () => new AlreadyExistsValidationError(model.table),
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isFormat: false,
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});
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return this;
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}
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public exists(modelType: ModelType<Model>, foreignKey?: string): Validator<V> {
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this.addStep({
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verifyStep: async (val, thingName, c) => {
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const results = await modelType.select('')
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.where(foreignKey !== undefined ? foreignKey : thingName, val)
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.execute(c);
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return results.results.length >= 1;
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},
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throw: () => new UnknownRelationValidationError(modelType.table, foreignKey),
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isFormat: false,
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});
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return this;
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}
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private addStep(step: ValidationStep<V>) {
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this.steps.push(step);
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}
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public getValidationAttributes(): string[] {
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return this.validationAttributes;
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}
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public step(step: number): Validator<V> {
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this.validationAttributes.push(`step="${step}"`);
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return this;
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}
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}
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interface ValidationStep<V> {
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interrupt?: (val?: V) => boolean;
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verifyStep(val: V | undefined, thingName: string, connection?: Connection): boolean | Promise<boolean>;
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throw: ((val?: V) => ValidationError<V>) | null;
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readonly isFormat: boolean;
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}
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export class ValidationBag<V> extends Error {
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private readonly errors: ValidationError<V>[] = [];
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public addMessage(err: ValidationError<V>): void {
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if (!err.thingName) throw new Error('Null thing name');
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this.errors.push(err);
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}
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public addBag(otherBag: ValidationBag<V>): void {
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for (const error of otherBag.errors) {
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this.errors.push(error);
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}
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}
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public hasMessages(): boolean {
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return this.errors.length > 0;
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}
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public getMessages(): { [p: string]: ValidationError<V> } {
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const messages: { [p: string]: ValidationError<V> } = {};
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for (const err of this.errors) {
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messages[err.thingName || 'unknown'] = {
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name: err.name,
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message: err.message,
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value: err.value,
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};
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}
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return messages;
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}
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public getErrors(): ValidationError<V>[] {
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return this.errors;
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}
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}
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export class ValidationError<V> extends Error {
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public rawValueToHuman?: (val: V) => string;
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public thingName?: string;
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public value?: V;
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public get name(): string {
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return this.constructor.name;
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}
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}
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export class BadLengthValidationError<V> extends ValidationError<V> {
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private readonly expectedLength: number;
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private readonly maxLength?: number;
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public constructor(expectedLength: number, maxLength?: number) {
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super();
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this.expectedLength = expectedLength;
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this.maxLength = maxLength;
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}
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public get message(): string {
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return `${this.thingName} expected length: ${this.expectedLength}${this.maxLength !== undefined ? ` to ${this.maxLength}` : ''}; ` +
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`actual length: ${isLenghtable(this.value) && this.value.length}.`;
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}
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}
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export class TooShortError<V> extends ValidationError<V> {
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private readonly minLength: number;
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public constructor(minLength: number) {
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super();
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this.minLength = minLength;
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}
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public get message(): string {
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return `${this.thingName} must be at least ${this.minLength} characters.`;
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}
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}
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export class TooLongError<V> extends ValidationError<V> {
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private readonly maxLength: number;
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public constructor(maxLength: number) {
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super();
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this.maxLength = maxLength;
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}
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public get message(): string {
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return `${this.thingName} must be at most ${this.maxLength} characters.`;
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}
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}
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export class BadValueValidationError<V> extends ValidationError<V> {
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private readonly expectedValue: V;
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public constructor(expectedValue: V) {
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super();
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this.expectedValue = expectedValue;
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}
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public get message(): string {
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let expectedValue: string = String(this.expectedValue);
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let actualValue: string = String(this.value);
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if (this.rawValueToHuman && this.value) {
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expectedValue = this.rawValueToHuman(this.expectedValue);
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actualValue = this.rawValueToHuman(this.value);
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}
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return `Expected: ${expectedValue}; got: ${actualValue}.`;
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}
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}
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export class DifferentThanError<V> extends ValidationError<V> {
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private readonly otherName?: string;
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public constructor(otherName?: string) {
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super();
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this.otherName = otherName;
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}
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public get message(): string {
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return `This should be the same as ${this.otherName}.`;
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}
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}
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export class OutOfRangeValidationError<V> extends ValidationError<V> {
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private readonly min?: number;
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private readonly max?: number;
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public constructor(min?: number, max?: number) {
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super();
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this.min = min;
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this.max = max;
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}
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public get message(): string {
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if (this.min === undefined) {
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return `${this.thingName} must be at most ${this.max}`;
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} else if (this.max === undefined) {
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return `${this.thingName} must be at least ${this.min}`;
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}
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let min: string = String(this.min);
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let max: string = String(this.max);
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if (this.rawValueToHuman) {
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min = this.rawValueToHuman(this.min as unknown as V);
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max = this.rawValueToHuman(this.max as unknown as V);
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}
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return `${this.thingName} must be between ${min} and ${max}.`;
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}
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}
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export class InvalidFormatValidationError<V> extends ValidationError<V> {
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public get message(): string {
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return `"${this.value}" is not a valid ${this.thingName}.`;
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}
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}
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export class UndefinedValueValidationError<V> extends ValidationError<V> {
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public get message(): string {
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return `${this.thingName} is required.`;
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}
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}
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export class AlreadyExistsValidationError<V> extends ValidationError<V> {
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private readonly table: string;
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public constructor(table: string) {
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super();
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this.table = table;
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}
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public get message(): string {
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return `${this.thingName} already exists in ${this.table}.`;
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}
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}
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export class UnknownRelationValidationError<V> extends ValidationError<V> {
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private readonly table: string;
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private readonly foreignKey?: string;
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public constructor(table: string, foreignKey?: string) {
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super();
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this.table = table;
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this.foreignKey = foreignKey;
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}
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public get message(): string {
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return `${this.thingName}=${this.value} relation was not found in ${this.table}${this.foreignKey !== undefined ? `.${this.foreignKey}` : ''}.`;
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}
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}
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export class FileError<V> extends ValidationError<V> {
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private readonly _message: string;
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public constructor(message: string) {
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super();
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this._message = message;
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}
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public get message(): string {
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return `${this._message}`;
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}
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}
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export type Lengthable = {
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length: number,
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};
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export function isLenghtable(value: unknown): value is Lengthable {
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return value !== undefined && value !== null &&
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typeof (value as Lengthable).length === 'number';
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}
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