103 lines
2.8 KiB
JavaScript
103 lines
2.8 KiB
JavaScript
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import { getQuery, joinURL, parseURL, withQuery, withoutBase } from "ufo";
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const MAX_DECODE_PASSES = 8;
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const PERCENT_ESCAPE_RE = /%([\da-f]{2})/gi;
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const HAS_PERCENT_ESCAPE_RE = /%[\da-f]{2}/i;
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export function canonicalizePath(pathname) {
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let path = pathname;
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for (let pass = 0; HAS_PERCENT_ESCAPE_RE.test(path); pass++) {
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if (pass >= MAX_DECODE_PASSES) {
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return void 0;
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}
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path = path.replace(
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PERCENT_ESCAPE_RE,
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(_, hex) => String.fromCharCode(Number.parseInt(hex, 16))
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);
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}
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const segments = [];
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for (const segment of path.replace(/\\/g, "/").split("/")) {
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if (segment === "" || segment === ".") {
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continue;
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}
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if (segment === "..") {
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segments.pop();
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continue;
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}
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segments.push(segment);
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}
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return "/" + segments.join("/");
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}
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function whatwgPathname(pathname) {
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try {
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return new URL(pathname, "http://_").pathname;
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} catch {
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return void 0;
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}
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}
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const READINGS = [
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(p) => canonicalizePath(p),
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(p) => {
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const whatwg = whatwgPathname(p);
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return whatwg === void 0 ? void 0 : canonicalizePath(whatwg);
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}
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];
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export function isPathInScope(pathname, base) {
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if (!base || base === "/") {
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return true;
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}
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for (const read of READINGS) {
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const canonicalBase = read(base);
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const canonical = read(pathname);
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if (canonicalBase === void 0 || canonical === void 0) {
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return false;
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}
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if (canonicalBase === "/") {
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continue;
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}
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if (canonical !== canonicalBase && !canonical.startsWith(canonicalBase + "/")) {
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return false;
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}
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}
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return true;
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}
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export function isTargetInScope(target, targetBase) {
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return isPathInScope(
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parseURL(target).pathname || "/",
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parseURL(targetBase).pathname || ""
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);
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}
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const LEADING_SEPARATORS_RE = (
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// eslint-disable-next-line no-control-regex
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/^(?:[\u0000-\u0020/\\]|%(?:2f|5c|[01][\da-f]|20))+/i
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);
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export function normalizeRedirectPath(path) {
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return path.replace(LEADING_SEPARATORS_RE, "/");
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}
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export function resolveRedirectTarget(path, to, stripBase) {
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if (!to.endsWith("/**")) {
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return path.includes("?") ? withQuery(to, getQuery(path)) : to;
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}
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let targetPath = path;
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if (stripBase) {
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if (!isPathInScope(path.split("?")[0], stripBase)) {
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return void 0;
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}
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targetPath = withoutBase(targetPath, stripBase);
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}
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targetPath = normalizeRedirectPath(targetPath);
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const targetBase = to.slice(0, -3);
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if (targetBase && targetBase !== "/" && !isPathInScope(joinURL("/_", targetPath.split("?")[0]), "/_")) {
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return void 0;
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}
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let target = joinURL(targetBase, targetPath);
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if (!targetBase || targetBase === "/") {
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target = normalizeRedirectPath(target);
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if (!target.startsWith("/")) {
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target = "/" + target;
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}
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}
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if (!isTargetInScope(target, targetBase)) {
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return void 0;
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}
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return target;
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}
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