chore: import upstream snapshot with attribution

open-sse/config/codexClient.ts

@@ -0,0 +1,49 @@
+const DEFAULT_CODEX_CLIENT_VERSION = "0.142.0";
+const DEFAULT_CODEX_USER_AGENT_PLATFORM = "Windows 10.0.26200";
+const DEFAULT_CODEX_USER_AGENT_ARCH = "x64";
+const CODEX_VERSION_OVERRIDE_ENV = "CODEX_CLIENT_VERSION";
+const CODEX_USER_AGENT_OVERRIDE_ENV = "CODEX_USER_AGENT";
+const SAFE_HEADER_TOKEN_PATTERN = /^[A-Za-z0-9][A-Za-z0-9._-]{0,31}$/;
+const SAFE_HEADER_VALUE_PATTERN = /^[\x20-\x7E]{1,200}$/;
+const SAFE_CODEX_SESSION_ID_PATTERN = /^[A-Za-z0-9._:-]{1,200}$/;
+
+function getSafeEnvValue(name: string, pattern: RegExp): string | null {
+  const raw = process.env[name];
+  if (typeof raw !== "string") return null;
+  const normalized = raw.trim();
+  if (!normalized || !pattern.test(normalized)) {
+    return null;
+  }
+  return normalized;
+}
+
+export function getCodexClientVersion(): string {
+  return (
+    getSafeEnvValue(CODEX_VERSION_OVERRIDE_ENV, SAFE_HEADER_TOKEN_PATTERN) ||
+    DEFAULT_CODEX_CLIENT_VERSION
+  );
+}
+
+export function getCodexUserAgent(): string {
+  const override = getSafeEnvValue(CODEX_USER_AGENT_OVERRIDE_ENV, SAFE_HEADER_VALUE_PATTERN);
+  if (override) {
+    return override;
+  }
+
+  return `codex-cli/${getCodexClientVersion()} (${DEFAULT_CODEX_USER_AGENT_PLATFORM}; ${DEFAULT_CODEX_USER_AGENT_ARCH})`;
+}
+
+export function getCodexDefaultHeaders(): Record<string, string> {
+  return {
+    Version: getCodexClientVersion(),
+    "Openai-Beta": "responses=experimental",
+    "X-Codex-Beta-Features": "responses_websockets",
+    "User-Agent": getCodexUserAgent(),
+  };
+}
+
+export function normalizeCodexSessionId(value: unknown): string | null {
+  if (typeof value !== "string") return null;
+  const normalized = value.trim();
+  return SAFE_CODEX_SESSION_ID_PATTERN.test(normalized) ? normalized : null;
+}