47 lines
1.4 KiB
TypeScript
47 lines
1.4 KiB
TypeScript
import fs from "fs";
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import * as url from "../util/url.js";
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import { ResolverError } from "../util/errors.js";
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import type { JSONSchema, ResolverOptions } from "../types/index.js";
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import type { FileInfo } from "../types/index.js";
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export default {
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/**
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* The order that this resolver will run, in relation to other resolvers.
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*/
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order: 100,
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/**
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* Determines whether this resolver can read a given file reference.
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* Resolvers that return true will be tried, in order, until one successfully resolves the file.
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* Resolvers that return false will not be given a chance to resolve the file.
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*/
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canRead(file: FileInfo) {
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return url.isFileSystemPath(file.url);
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},
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/**
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* Reads the given file and returns its raw contents as a Buffer.
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*/
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async read(file: FileInfo): Promise<Buffer> {
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let path: string | undefined;
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try {
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path = url.toFileSystemPath(file.url);
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} catch (err: any) {
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const e = err as Error;
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e.message = `Malformed URI: ${file.url}: ${e.message}`;
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throw new ResolverError(e, file.url);
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}
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// strip trailing slashes
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if (path.endsWith("/") || path.endsWith("\\")) {
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path = path.slice(0, -1);
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}
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try {
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return await fs.promises.readFile(path);
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} catch (err: any) {
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const e = err as Error;
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e.message = `Error opening file ${path}: ${e.message}`;
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throw new ResolverError(e, path);
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}
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},
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} as ResolverOptions<JSONSchema>;
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