69 lines
2.3 KiB
TypeScript
69 lines
2.3 KiB
TypeScript
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import { posix } from "node:path";
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import { fileURLToPath, pathToFileURL } from "node:url";
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interface SourceMapPath {
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readonly value: string;
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readonly scope: "artifact-relative" | "suffix";
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}
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/** Resolve a source-map URL reference without changing its recorded identity. */
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export const resolveJavaScriptSourceMapPath = (
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source: string,
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mapPath?: string,
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): SourceMapPath | null => {
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const portable = source.replaceAll("\\", "/");
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const windowsPath = /^[a-z]:\//iu.test(portable) || source.startsWith("\\\\");
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// Preserve parent traversal rather than letting URL resolution clamp at '/'.
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const anchor = `/${"source/".repeat(portable.split("/").length + 1)}`;
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const directory = posix.join(
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anchor,
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posix.dirname(mapPath?.replaceAll("\\", "/") ?? "."),
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);
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const base = pathToFileURL(`${directory}/`, { windows: false });
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const absolute = windowsPath ? windowsFileUrl(source) : URL.parse(source);
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const resolved = windowsPath ? absolute : URL.parse(source, base);
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if (
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resolved === null ||
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!resolved.pathname.startsWith("/") ||
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resolved.pathname.endsWith("/")
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)
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return null;
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const relative =
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absolute === null
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? !portable.startsWith("/")
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: absolute.href !== resolved.href;
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const path = decodedUrlPath(resolved);
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if (path === null) return null;
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const value = relative
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? posix.relative(anchor, path)
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: path.replace(/^\/+/, "");
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if (value === "" || value === ".." || value.startsWith("../")) return null;
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return {
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value,
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scope: relative && mapPath !== undefined ? "artifact-relative" : "suffix",
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};
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};
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const windowsFileUrl = (path: string): URL | null => {
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try {
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return pathToFileURL(path, { windows: true });
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} catch (cause: unknown) {
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if (cause instanceof TypeError) return null;
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throw cause;
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}
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};
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const decodedUrlPath = (url: URL): string | null => {
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// Encoded separators must not manufacture a different filesystem hierarchy.
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if (/%(?:2f|5c)/iu.test(url.pathname)) return null;
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try {
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if (url.protocol === "file:")
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return fileURLToPath(url, {
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windows: url.hostname !== "" && url.hostname !== "localhost",
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}).replaceAll("\\", "/");
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return `${url.host}${decodeURIComponent(url.pathname)}`;
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} catch (cause: unknown) {
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if (cause instanceof URIError || cause instanceof TypeError) return null;
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throw cause;
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}
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};
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