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check-links.js
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check-links.js
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const cheerio = require("cheerio");
const fs = require("fs/promises");
const path = require("path");
const SITE_ROOT = path.join(__dirname, "_site");
const exists = async (path) => {
try {
await fs.access(path);
return true;
} catch (e) {
return false;
}
};
const getFiles = async (root) => {
const fsChildren = await fs.readdir(root);
const files = [];
for await (const child of fsChildren) {
const full = path.join(root, child);
const stat = await fs.lstat(full);
if (stat.isFile()) {
files.push(full);
} else if (stat.isDirectory()) {
files.push(...(await getFiles(full)));
}
}
return files.filter((file) => file.endsWith(".html"));
};
const getDom = async (file) => {
const html = await fs.readFile(file, { encoding: "utf-8" });
const dom = cheerio.load(html);
const redirect = dom('meta[http-equiv="refresh"]').get().pop();
if (redirect) {
const [, realFile] = dom(redirect)
.attr("content")
.match(/url=(\S+)/i);
// If the redirect path is to an HTTP endpoint, we don't need to load the
// redirected DOM because it's external.
if (realFile.startsWith("http") || realFile.startsWith("//")) {
return dom;
}
const realFilePath = path.join(
SITE_ROOT,
// Strip off any URL hashes and remove the base URL portion to get down
// to just the target file.
realFile.replace(/\#.*$/, "").replace(process.env.BASEURL, ""),
path.basename(file)
);
const redirectedHtml = await fs.readFile(realFilePath, {
encoding: "utf-8",
});
return cheerio.load(redirectedHtml);
}
return dom;
};
const run = async () => {
const files = await getFiles(SITE_ROOT);
const pagesMap = new Map();
for await (const file of files) {
const dom = await getDom(file);
const ids = dom("[id]")
.map(function () {
return dom(this).attr("id");
})
.get();
const links = dom("img[src], a[href], iframe[src], link[href], script[src]")
.map(function () {
return dom(this).attr("src") ?? dom(this).attr("href");
})
.get()
.filter((url) => /^[#\/]/.test(url))
// Filter out /#top anchor since that is rendered by the browser
.filter((url) => !/#top/i.test(url));
pagesMap.set(file, { ids, links });
}
console.log(`Checking ${pagesMap.size} pages...`);
const errors = new Map();
for (const [page, { ids, links }] of pagesMap) {
errors.set(page, []);
for (const link of links) {
if (link.startsWith("/")) {
const url = new URL(link, "https://18f.gov");
const pathComponents = [SITE_ROOT];
// if(/^\/(images|))
pathComponents.push(url.pathname.replace(process.env.BASEURL, ""));
// If the link does not include a file path, append index.html
if (!/\.[a-z]+/i.test(url.pathname)) {
pathComponents.push("index.html");
}
const filePath = path.join(...pathComponents);
const targetFileExists = await exists(filePath);
if (targetFileExists) {
if (url.hash) {
const targetId = url.hash.replace(/^#/, "");
const targetHashExists = pagesMap
.get(filePath)
.ids.includes(targetId);
if (!targetHashExists) {
errors
.get(page)
.push(`link to ${link} - target hash does not exist`);
}
}
} else {
errors.get(page).push(`link to ${link}: target file does not exist`);
}
} else {
const targetId = link.replace(/^#/, "");
const targetHashExists = ids.includes(targetId.toLowerCase());
if (!targetHashExists) {
errors.get(page).push(`link to ${link} - target hash does not exist`);
}
}
}
}
const errorMessages = [];
for (const [page, pageErrors] of errors) {
if (pageErrors.length) {
if (errorMessages.length) {
errorMessages.push("");
}
errorMessages.push(`${page}`);
for (const error of pageErrors) {
errorMessages.push(` ${error}`);
}
}
}
if (errorMessages.length) {
console.log(errorMessages.join("\n"));
process.exit(1);
} else {
console.log("No errors!");
}
};
run();