by codex: feat. General Improvements

lib/api/codexApi.ts

@@ -2,6 +2,64 @@ import type { CodexAuth, CodexUsageResponse } from "@/types/codex";
 
 const USAGE_URL = "https://chatgpt.com/backend-api/wham/usage";
 
+function isNumber(value: unknown): value is number {
+  return typeof value === "number" && Number.isFinite(value);
+}
+
+export function parseCodexUsageResponse(data: unknown): CodexUsageResponse {
+  if (!data || typeof data !== "object") {
+    throw new Error("INVALID_CODEX_RESPONSE");
+  }
+
+  const value = data as Record<string, unknown>;
+  const rateLimit = value.rate_limit as Record<string, unknown> | undefined;
+  const primary = rateLimit?.primary_window as Record<string, unknown> | undefined;
+  const secondary = rateLimit?.secondary_window as Record<string, unknown> | undefined;
+  const credits = value.credits as Record<string, unknown> | undefined;
+
+  const validWindow = (window: Record<string, unknown> | undefined) =>
+    !!window &&
+    isNumber(window.used_percent) &&
+    isNumber(window.reset_at) &&
+    isNumber(window.limit_window_seconds);
+
+  if (
+    typeof value.plan_type !== "string" ||
+    !validWindow(primary) ||
+    !validWindow(secondary) ||
+    !credits ||
+    typeof credits.has_credits !== "boolean" ||
+    typeof credits.unlimited !== "boolean" ||
+    !isNumber(credits.balance)
+  ) {
+    throw new Error("INVALID_CODEX_RESPONSE");
+  }
+
+  const primaryWindow = primary as Record<string, unknown>;
+  const secondaryWindow = secondary as Record<string, unknown>;
+
+  return {
+    plan_type: value.plan_type,
+    rate_limit: {
+      primary_window: {
+        used_percent: primaryWindow.used_percent as number,
+        reset_at: primaryWindow.reset_at as number,
+        limit_window_seconds: primaryWindow.limit_window_seconds as number,
+      },
+      secondary_window: {
+        used_percent: secondaryWindow.used_percent as number,
+        reset_at: secondaryWindow.reset_at as number,
+        limit_window_seconds: secondaryWindow.limit_window_seconds as number,
+      },
+    },
+    credits: {
+      has_credits: credits.has_credits,
+      unlimited: credits.unlimited,
+      balance: credits.balance,
+    },
+  };
+}
+
 export async function fetchCodexUsage(auth: CodexAuth): Promise<CodexUsageResponse> {
   const headers: Record<string, string> = {
     Authorization: `Bearer ${auth.accessToken}`,
@@ -22,5 +80,6 @@ export async function fetchCodexUsage(auth: CodexAuth): Promise<CodexUsageRespon
     throw new Error(`HTTP_ERROR_${response.status}`);
   }
 
-  return response.json() as Promise<CodexUsageResponse>;
+  const data: unknown = await response.json();
+  return parseCodexUsageResponse(data);
 }