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import fetch from "node-fetch";
// アクションごとの閾値定義（一元管理）
export const RECAPTCHA_THRESHOLDS: Record<string, number> = {
AUTHENTICATE: 0.3,
};
export const recaptchaVerifier: HttpFunction = async (req, res) => {
// CORS configuration
res.set("Access-Control-Allow-Origin", "*");
res.set("Access-Control-Allow-Methods", "POST, OPTIONS");
res.set("Access-Control-Allow-Headers", "Content-Type");
res.set("Access-Control-Max-Age", "3600");
if (req.method === "OPTIONS") {
res.status(204).send("");
return;
}
if (req.method !== "POST") {
res.status(405).send("Method Not Allowed");
return;
}
const { token, action } = req.body;
if (!token) {
res.status(400).json({ success: false, error: "reCAPTCHA token missing" });
return;
}
const requestedAction = typeof action === "string" ? action : "";
// アクションに基づく閾値の決定（デフォルトは0.3）
const threshold = RECAPTCHA_THRESHOLDS[requestedAction] || 0.3;
try {
const isValid = await verifyRecaptcha(token, requestedAction, threshold);
res.status(200).json({ success: isValid });
} catch (error) {
console.error("Error in recaptchaVerifier:", error);
res.status(500).json({ success: false, error: "Verification failed" });
}
};
/**
* reCAPTCHA v3 トークンを検証するユーティリティ関数
*
* @param token 検証するトークン
* @param action 期待されるアクション名
* @param threshold 許容するスコアの閾値
* @returns 検証結果（成功: true, 失敗: false）
*/
export async function verifyRecaptcha(
token: string,
action: string,
threshold: number,
): Promise<boolean> {
const secret = process.env.RECAPTCHA_V3_SECRET_KEY;
if (!secret) {
// 仕様変更: 設定漏れは致命的なのでErrorをスロー (Fail Closed)
console.error("RECAPTCHA_V3_SECRET_KEY is not set.");
throw new Error("RECAPTCHA_V3_SECRET_KEY is not set.");
}
try {
const params = new URLSearchParams();
params.append("secret", secret);
params.append("response", token);
const response = await fetch(
"https://www.google.com/recaptcha/api/siteverify",
{
method: "POST",
body: params,
},
);
const data = (await response.json()) as {
success: boolean;
score: number;
action: string;
hostname: string;
"error-codes"?: string[];
};
// 構造化ログの出力
console.log(
JSON.stringify({
severity: "INFO",
component: "recaptcha",
token_verification: {
success: data.success,
score: data.score,
action: data.action,
hostname: data.hostname,
expected_action: action,
threshold: threshold,
error_codes: data["error-codes"],
},
}),
);
if (!data.success) {
console.warn("reCAPTCHA verification failed:", data["error-codes"]);
return false;
}
if (data.action !== action) {
console.warn(
`reCAPTCHA action mismatch: expected '${action}', got '${data.action}'`,
);
return false;
}
if (data.score < threshold) {
console.warn(
`reCAPTCHA score too low: ${data.score} < ${threshold} (action: ${action})`,
);
return false;
}
return true;
} catch (error) {
// 仕様変更: Google APIエラー時はログを出して通す (Fail Open)
console.error(
JSON.stringify({
severity: "ERROR",
component: "recaptcha",
result: "error_skipped", // 指示通りの識別子
message: "Error during reCAPTCHA verification, allowing request.",
error: error instanceof Error ? error.message : String(error),
}),
);
return true;
}
}
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