Ship Steam login, D1 player sync, and cached「我」dashboard.
Players get a fast TTL-backed homepage (local profile / Cloudflare D1) with dense UI polish; login unlocks /home without blocking on every OpenDota refresh. Co-authored-by: Cursor <cursoragent@cursor.com>
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voson
Cursor
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/**
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* Shared Steam OpenID + signed-session helpers for Pages Functions.
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*
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* Env: STEAM_API_KEY, SESSION_SECRET (required for login/me).
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* Cookie: climperor_steam (HttpOnly, signed payload).
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*/
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const COOKIE_NAME = "climperor_steam";
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const SESSION_DAYS = 30;
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const STEAM_OPENID = "https://steamcommunity.com/openid/login";
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const STEAM_ID_PREFIX = "https://steamcommunity.com/openid/id/";
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export function jsonResponse(body, status = 200, extraHeaders = {}) {
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return new Response(JSON.stringify(body), {
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status,
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headers: {
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"Content-Type": "application/json; charset=utf-8",
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"Cache-Control": "no-store",
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...extraHeaders,
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},
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});
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}
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export function envOf(context) {
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return (context && context.env) || {};
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}
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function b64urlEncode(bytes) {
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let bin = "";
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const arr = bytes instanceof Uint8Array ? bytes : new Uint8Array(bytes);
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for (let i = 0; i < arr.length; i++) bin += String.fromCharCode(arr[i]);
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return btoa(bin).replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/g, "");
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}
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function b64urlDecode(str) {
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const pad = "=".repeat((4 - (str.length % 4)) % 4);
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const b64 = (str + pad).replace(/-/g, "+").replace(/_/g, "/");
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const bin = atob(b64);
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const out = new Uint8Array(bin.length);
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for (let i = 0; i < bin.length; i++) out[i] = bin.charCodeAt(i);
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return out;
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}
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async function hmacSign(secret, message) {
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const enc = new TextEncoder();
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const key = await crypto.subtle.importKey(
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"raw",
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enc.encode(secret),
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{ name: "HMAC", hash: "SHA-256" },
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false,
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["sign"]
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);
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const sig = await crypto.subtle.sign("HMAC", key, enc.encode(message));
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return b64urlEncode(sig);
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}
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export function steamId64ToAccountId(steamId64) {
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try {
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const n = BigInt(String(steamId64));
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const account = n - 76561197960265728n;
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if (account <= 0n) return null;
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return Number(account);
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} catch {
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return null;
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}
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}
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export function parseSteamIdFromClaimedId(claimedId) {
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if (!claimedId || typeof claimedId !== "string") return null;
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if (!claimedId.startsWith(STEAM_ID_PREFIX)) return null;
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const id = claimedId.slice(STEAM_ID_PREFIX.length).replace(/\/$/, "");
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if (!/^\d{17}$/.test(id)) return null;
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return id;
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}
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export async function createSessionToken(secret, payload) {
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const body = {
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...payload,
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exp: Math.floor(Date.now() / 1000) + SESSION_DAYS * 86400,
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};
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const raw = b64urlEncode(new TextEncoder().encode(JSON.stringify(body)));
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const sig = await hmacSign(secret, raw);
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return `${raw}.${sig}`;
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}
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export async function verifySessionToken(secret, token) {
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if (!secret || !token || typeof token !== "string") return null;
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const parts = token.split(".");
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if (parts.length !== 2) return null;
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const [raw, sig] = parts;
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const expect = await hmacSign(secret, raw);
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if (sig.length !== expect.length) return null;
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let ok = 0;
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for (let i = 0; i < sig.length; i++) ok |= sig.charCodeAt(i) ^ expect.charCodeAt(i);
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if (ok !== 0) return null;
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try {
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const json = new TextDecoder().decode(b64urlDecode(raw));
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const data = JSON.parse(json);
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if (!data || !data.exp || data.exp < Math.floor(Date.now() / 1000)) return null;
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if (!data.steamid || !data.account_id) return null;
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return data;
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} catch {
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return null;
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}
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}
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export function readCookie(request, name = COOKIE_NAME) {
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const header = request.headers.get("Cookie") || "";
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const parts = header.split(";").map((s) => s.trim());
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for (const p of parts) {
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if (p.startsWith(name + "=")) {
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return decodeURIComponent(p.slice(name.length + 1));
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}
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}
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return null;
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}
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function sessionCookieHeader(token, { clear = false } = {}) {
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if (clear) {
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return `${COOKIE_NAME}=; Path=/; HttpOnly; SameSite=Lax; Max-Age=0`;
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}
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const maxAge = SESSION_DAYS * 86400;
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return `${COOKIE_NAME}=${encodeURIComponent(token)}; Path=/; HttpOnly; SameSite=Lax; Max-Age=${maxAge}`;
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}
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/** Add Secure on non-localhost. */
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export function sessionCookieHeaderForRequest(request, token, { clear = false } = {}) {
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let base = sessionCookieHeader(token, { clear });
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const host = new URL(request.url).hostname;
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if (host !== "127.0.0.1" && host !== "localhost") {
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base = base.replace("SameSite=Lax", "Secure; SameSite=Lax");
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}
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return base;
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}
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export function steamLoginRedirectUrl(origin) {
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const returnTo = `${origin}/api/auth/steam/callback`;
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const params = new URLSearchParams({
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"openid.ns": "http://specs.openid.net/auth/2.0",
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"openid.mode": "checkid_setup",
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"openid.return_to": returnTo,
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"openid.realm": origin,
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"openid.identity": "http://specs.openid.net/auth/2.0/identifier_select",
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"openid.claimed_id": "http://specs.openid.net/auth/2.0/identifier_select",
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});
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return `${STEAM_OPENID}?${params.toString()}`;
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}
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export async function verifySteamOpenId(query) {
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const mode = query.get("openid.mode");
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if (mode !== "id_res") return { ok: false, error: "bad mode" };
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const claimed = query.get("openid.claimed_id");
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const steamid = parseSteamIdFromClaimedId(claimed);
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if (!steamid) return { ok: false, error: "bad claimed_id" };
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const body = new URLSearchParams();
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for (const [k, v] of query.entries()) {
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if (k.startsWith("openid.")) body.set(k, v);
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}
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body.set("openid.mode", "check_authentication");
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const res = await fetch(STEAM_OPENID, {
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method: "POST",
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headers: {
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"Content-Type": "application/x-www-form-urlencoded",
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"User-Agent": "climperor-steam-auth",
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},
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body,
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});
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const text = await res.text();
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if (!/is_valid\s*:\s*true/i.test(text)) {
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return { ok: false, error: "openid invalid" };
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}
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return { ok: true, steamid };
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}
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export async function fetchSteamPersona(apiKey, steamid) {
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if (!apiKey) return { personaname: null, avatar: null };
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const url = new URL(
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"https://api.steampowered.com/ISteamUser/GetPlayerSummaries/v2/"
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);
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url.searchParams.set("key", apiKey);
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url.searchParams.set("steamids", steamid);
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try {
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const res = await fetch(url.toString(), {
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headers: { "User-Agent": "climperor-steam-auth" },
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});
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if (!res.ok) return { personaname: null, avatar: null };
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const data = await res.json();
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const players = data && data.response && data.response.players;
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const p = Array.isArray(players) && players[0] ? players[0] : null;
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if (!p) return { personaname: null, avatar: null };
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return {
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personaname: p.personaname || null,
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avatar: p.avatarfull || p.avatarmedium || p.avatar || null,
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};
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} catch {
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return { personaname: null, avatar: null };
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}
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}
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export async function sessionFromRequest(context) {
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const env = envOf(context);
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const secret = (env.SESSION_SECRET || "").trim();
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if (!secret) return null;
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const token = readCookie(context.request);
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if (!token) return null;
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return verifySessionToken(secret, token);
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}
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