75 lines
2.9 KiB
JavaScript
75 lines
2.9 KiB
JavaScript
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let visitorCountryPromise = null;
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const IP_LOOKUP_TIMEOUT_MS = 3500;
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async function fetchWithTimeout(url, options = {}) {
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const controller = new AbortController();
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const timeout = window.setTimeout(() => controller.abort(), IP_LOOKUP_TIMEOUT_MS);
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try {
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return await fetch(url, { ...options, signal: controller.signal });
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} finally {
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window.clearTimeout(timeout);
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}
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}
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async function countryFromCloudflare() {
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for (const url of ["/cdn-cgi/trace", "https://www.cloudflare.com/cdn-cgi/trace"]) {
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try {
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const response = await fetchWithTimeout(url, { credentials: "omit", headers: { Accept: "text/plain" }, mode: "cors" });
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if (!response.ok) continue;
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const country = String((await response.text()).match(/^loc=([A-Z]{2})$/m)?.[1] || "").toUpperCase();
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if (country) return country;
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} catch {}
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}
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return "";
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}
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async function countryFromCountryIs() {
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const response = await fetchWithTimeout("https://api.country.is/", { credentials: "omit", mode: "cors" });
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if (!response.ok) return "";
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return String((await response.json())?.country || "").toUpperCase();
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}
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async function countryFromIpWho() {
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const response = await fetchWithTimeout("https://ipwho.is/?fields=success,country_code", {
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credentials: "omit",
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headers: { Accept: "application/json" },
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mode: "cors",
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});
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if (!response.ok) return "";
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const payload = await response.json();
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return payload?.success ? String(payload.country_code || "").toUpperCase() : "";
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}
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export function detectVisitorCountry() {
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if (visitorCountryPromise) return visitorCountryPromise;
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if (typeof window === "undefined" || typeof fetch !== "function") return Promise.resolve("");
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visitorCountryPromise = (async () => {
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for (const detector of [countryFromCloudflare, countryFromCountryIs, countryFromIpWho]) {
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try {
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const country = await detector();
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if (/^[A-Z]{2}$/.test(country)) return country;
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} catch (error) {
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console.debug("[家纺跨境情报] IP 区域检测源不可用，继续尝试备用源:", error);
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}
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}
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return "UNKNOWN";
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})();
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return visitorCountryPromise;
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}
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export function visitorCanUseGoogleFallback() {
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if (typeof navigator === "undefined" || typeof Intl === "undefined") return false;
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const language = String(navigator.languages?.[0] || navigator.language || "").toLowerCase();
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const timeZone = String(Intl.DateTimeFormat().resolvedOptions().timeZone || "");
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const nonChineseLanguage = Boolean(language) && !language.startsWith("zh");
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const outsideChinaTimeZone = Boolean(timeZone) && !["Asia/Shanghai", "Asia/Urumqi"].includes(timeZone);
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return nonChineseLanguage || outsideChinaTimeZone;
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}
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export function translationProvider(countryCode, googleFallback = visitorCanUseGoogleFallback()) {
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if (countryCode === "CN") return "yandex";
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if (countryCode && countryCode !== "UNKNOWN") return "google";
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if ((!countryCode || countryCode === "UNKNOWN") && googleFallback) return "google";
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return "yandex";
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}
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