redis cache

www/app/lib/redisTokenCache.ts

@@ -0,0 +1,61 @@
+import { z } from "zod";
+import { REFRESH_ACCESS_TOKEN_BEFORE } from "./auth";
+
+const TokenCacheEntrySchema = z.object({
+  token: z.object({
+    sub: z.string().optional(),
+    name: z.string().nullish(),
+    email: z.string().nullish(),
+    accessToken: z.string(),
+    accessTokenExpires: z.number(),
+    refreshToken: z.string().optional(),
+    error: z.string().optional(),
+  }),
+  timestamp: z.number(),
+});
+
+const TokenCacheEntryCodec = z.codec(z.string(), TokenCacheEntrySchema, {
+  decode: (jsonString) => {
+    const parsed = JSON.parse(jsonString);
+    return TokenCacheEntrySchema.parse(parsed);
+  },
+  encode: (value) => JSON.stringify(value),
+});
+
+export type TokenCacheEntry = z.infer<typeof TokenCacheEntrySchema>;
+
+export type KV = {
+  get(key: string): Promise<string | null>;
+  setex(key: string, seconds: number, value: string): Promise<"OK">;
+  del(key: string): Promise<number>;
+};
+
+export async function getTokenCache(
+  redis: KV,
+  key: string,
+): Promise<TokenCacheEntry | null> {
+  const data = await redis.get(key);
+  if (!data) return null;
+
+  try {
+    return TokenCacheEntryCodec.decode(data);
+  } catch (error) {
+    console.error("Invalid token cache data:", error);
+    await redis.del(key);
+    return null;
+  }
+}
+
+export async function setTokenCache(
+  redis: KV,
+  key: string,
+  value: TokenCacheEntry,
+): Promise<void> {
+  const encodedValue = TokenCacheEntryCodec.encode(value);
+  const ttlSeconds = Math.floor(REFRESH_ACCESS_TOKEN_BEFORE / 1000);
+  await redis.setex(key, ttlSeconds, encodedValue);
+}
+
+export async function deleteTokenCache(redis: KV, key: string): Promise<void> {
+  await redis.del(key);
+}