api: flatten code directories, better filenames, remove old files

api/src/processing/cookie/manager.js

@@ -0,0 +1,66 @@
+import Cookie from './cookie.js';
+import { readFile, writeFile } from 'fs/promises';
+import { parse as parseSetCookie, splitCookiesString } from 'set-cookie-parser';
+import { env } from '../../config.js';
+
+const WRITE_INTERVAL = 60000,
+      cookiePath = env.cookiePath,
+      COUNTER = Symbol('counter');
+
+let cookies = {}, dirty = false, intervalId;
+
+const setup = async () => {
+    try {
+        if (!cookiePath) return;
+
+        cookies = await readFile(cookiePath, 'utf8');
+        cookies = JSON.parse(cookies);
+        intervalId = setInterval(writeChanges, WRITE_INTERVAL)
+    } catch { /* no cookies for you */ }
+}
+
+setup();
+
+function writeChanges() {
+    if (!dirty) return;
+    dirty = false;
+
+    writeFile(cookiePath, JSON.stringify(cookies, null, 4)).catch(() => {
+        clearInterval(intervalId)
+    })
+}
+
+export function getCookie(service) {
+    if (!cookies[service] || !cookies[service].length) return;
+
+    let n;
+    if (cookies[service][COUNTER] === undefined) {
+        n = cookies[service][COUNTER] = 0
+    } else {
+        ++cookies[service][COUNTER]
+        n = (cookies[service][COUNTER] %= cookies[service].length)
+    }
+
+    const cookie = cookies[service][n];
+    if (typeof cookie === 'string') cookies[service][n] = Cookie.fromString(cookie);
+
+    return cookies[service][n]
+}
+
+export function updateCookie(cookie, headers) {
+    if (!cookie) return;
+
+    const parsed = parseSetCookie(
+        splitCookiesString(headers.get('set-cookie')),
+        { decodeValues: false }
+    ), values = {}
+
+    cookie.unset(parsed.filter(c => c.expires < new Date()).map(c => c.name));
+    parsed.filter(c => !c.expires || c.expires > new Date()).forEach(c => values[c.name] = c.value);
+    updateCookieValues(cookie, values);
+}
+
+export function updateCookieValues(cookie, values) {
+    cookie.set(values);
+    if (Object.keys(values).length) dirty = true
+}