122 lines
3.3 KiB
TypeScript
122 lines
3.3 KiB
TypeScript
/**
|
|
* Lets the create form warn that a link was already dumped. It adds
|
|
* `dumps.url_canonical`, the key the hint looks a URL up by, and fills it for
|
|
* every URL dump already posted.
|
|
*
|
|
* It fills the key from each stored URL and fetches nothing. Its helpers are a
|
|
* copy of lib/canonical-url.ts as it stood when this shipped: importing the
|
|
* live one would give two databases migrated at different times keys made by
|
|
* different rules. A change to lib/canonical-url.ts therefore needs a new
|
|
* migration that fills the keys again.
|
|
*
|
|
* @module
|
|
*/
|
|
|
|
import type { DatabaseSync } from "node:sqlite";
|
|
|
|
const TRACKING_PARAMS = new Set([
|
|
"fbclid",
|
|
"gclid",
|
|
"dclid",
|
|
"msclkid",
|
|
"twclid",
|
|
"yclid",
|
|
"mc_cid",
|
|
"mc_eid",
|
|
"igshid",
|
|
"igsh",
|
|
"si",
|
|
"spm",
|
|
"ref_src",
|
|
"ref_url",
|
|
"_ga",
|
|
"_gl",
|
|
"__twitter_impression",
|
|
]);
|
|
|
|
function isTrackingParam(key: string): boolean {
|
|
const k = key.toLowerCase();
|
|
return k.startsWith("utm_") || TRACKING_PARAMS.has(k);
|
|
}
|
|
|
|
const YOUTUBE_HOSTS = new Set([
|
|
"youtube.com",
|
|
"m.youtube.com",
|
|
"music.youtube.com",
|
|
"youtube-nocookie.com",
|
|
]);
|
|
|
|
function youtubeVideoId(
|
|
host: string,
|
|
pathname: string,
|
|
params: URLSearchParams,
|
|
): string | null {
|
|
if (host === "youtu.be") return pathname.split("/")[1] || null;
|
|
if (!YOUTUBE_HOSTS.has(host)) return null;
|
|
if (pathname === "/watch") return params.get("v");
|
|
if (/^\/(embed|shorts|live)\//.test(pathname)) {
|
|
return pathname.split("/")[2] || null;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
function canonicalizeUrl(raw: string): string | null {
|
|
let u: URL;
|
|
try {
|
|
u = new URL(raw);
|
|
} catch {
|
|
return null;
|
|
}
|
|
if (u.protocol !== "http:" && u.protocol !== "https:") return null;
|
|
|
|
const host = u.hostname.toLowerCase().replace(/^www\./, "");
|
|
if (!host) return null;
|
|
|
|
const videoId = youtubeVideoId(host, u.pathname, u.searchParams);
|
|
if (videoId) return `https://youtube.com/watch?v=${videoId}`;
|
|
|
|
const listId = YOUTUBE_HOSTS.has(host) && u.pathname === "/playlist"
|
|
? u.searchParams.get("list")
|
|
: null;
|
|
if (listId) return `https://youtube.com/playlist?list=${listId}`;
|
|
|
|
const path = u.pathname.replace(/\/+$/, "");
|
|
|
|
const params = [...u.searchParams.entries()]
|
|
.filter(([key]) => !isTrackingParam(key))
|
|
.sort(([a, av], [b, bv]) => a.localeCompare(b) || av.localeCompare(bv));
|
|
const query = new URLSearchParams(params).toString();
|
|
|
|
const hash = /^#!?\//.test(u.hash) ? u.hash : "";
|
|
|
|
return `https://${host}${path}${query ? `?${query}` : ""}${hash}`;
|
|
}
|
|
|
|
/**
|
|
* Run once by `runMigrations`. It fills only the keys still NULL, and leaves
|
|
* NULL a URL that isn't http(s).
|
|
*/
|
|
export function up(db: DatabaseSync): void {
|
|
const columns = db.prepare(`PRAGMA table_info(dumps);`).all() as {
|
|
name: string;
|
|
}[];
|
|
if (!columns.some((c) => c.name === "url_canonical")) {
|
|
db.exec(`ALTER TABLE dumps ADD COLUMN url_canonical TEXT;`);
|
|
}
|
|
db.exec(
|
|
`CREATE INDEX IF NOT EXISTS idx_dumps_url_canonical ON dumps(url_canonical);`,
|
|
);
|
|
|
|
const rows = db.prepare(
|
|
`SELECT id, url FROM dumps WHERE url IS NOT NULL AND url_canonical IS NULL;`,
|
|
).all() as { id: string; url: string }[];
|
|
|
|
const update = db.prepare(
|
|
`UPDATE dumps SET url_canonical = ? WHERE id = ?;`,
|
|
);
|
|
for (const row of rows) {
|
|
const canonical = canonicalizeUrl(row.url);
|
|
if (canonical) update.run(canonical, row.id);
|
|
}
|
|
}
|