98 lines
3.1 KiB
TypeScript
98 lines
3.1 KiB
TypeScript
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/**
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* Copyright (c) Microsoft Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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export type JsonSchema = {
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type?: string;
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properties?: Record<string, JsonSchema>;
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required?: string[];
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items?: JsonSchema;
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oneOf?: JsonSchema[];
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pattern?: string;
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patternError?: string;
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};
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const regexCache = new Map<string, RegExp>();
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export function validate(value: unknown, schema: JsonSchema, path: string): string[] {
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const errors: string[] = [];
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if (schema.oneOf) {
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let bestErrors: string[] | undefined;
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for (const variant of schema.oneOf) {
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const variantErrors = validate(value, variant, path);
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if (variantErrors.length === 0)
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return [];
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// Prefer the variant with fewest errors (closest match).
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if (!bestErrors || variantErrors.length < bestErrors.length)
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bestErrors = variantErrors;
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}
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// If the best match has only top-level type mismatches, use a generic message.
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if (bestErrors!.length === 1 && bestErrors![0].startsWith(`${path}: expected `))
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return [`${path}: does not match any of the expected types`];
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return bestErrors!;
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}
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if (schema.type === 'string') {
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if (typeof value !== 'string') {
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errors.push(`${path}: expected string, got ${typeof value}`);
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return errors;
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}
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if (schema.pattern && !cachedRegex(schema.pattern).test(value))
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errors.push(schema.patternError || `${path}: must match pattern "${schema.pattern}"`);
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return errors;
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}
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if (schema.type === 'array') {
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if (!Array.isArray(value)) {
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errors.push(`${path}: expected array, got ${typeof value}`);
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return errors;
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}
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if (schema.items) {
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for (let i = 0; i < value.length; i++)
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errors.push(...validate(value[i], schema.items, `${path}[${i}]`));
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}
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return errors;
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}
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if (schema.type === 'object') {
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if (!value || typeof value !== 'object' || Array.isArray(value)) {
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errors.push(`${path}: expected object, got ${Array.isArray(value) ? 'array' : typeof value}`);
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return errors;
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}
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const obj = value as Record<string, unknown>;
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for (const key of schema.required || []) {
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if (obj[key] === undefined)
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errors.push(`${path}.${key}: required`);
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}
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for (const [key, propSchema] of Object.entries(schema.properties || {})) {
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if (obj[key] !== undefined)
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errors.push(...validate(obj[key], propSchema, `${path}.${key}`));
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}
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return errors;
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}
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return errors;
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}
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function cachedRegex(pattern: string): RegExp {
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let regex = regexCache.get(pattern);
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if (!regex) {
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regex = new RegExp(pattern);
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regexCache.set(pattern, regex);
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}
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return regex;
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}
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