Function handleTranslationRequest

entrypoints/offscreen/main.ts:143–211

(data: any)

// 处理翻译请求
async function handleTranslationRequest(data: any): Promise<string> {
    const { text, from, to } = data;
    
    if (!text || typeof text !== 'string' || text.trim() === '') {
        return ""
    }

    // 检查是否支持 Chrome Translation API
    if (!isChromeTranslationSupported()) {
        throw new Error('当前浏览器不支持 Chrome Translation API，请确保使用 Google Chrome 浏览器 v138 stable 或更高版本。');
    }

    // 声明变量以便在 catch 块中使用
    let detectedLang = from;
    let fromLang = from;
    let toLang = to;
    
    try {
        // 检测源语言
        if (from === 'auto') {
            detectedLang = await detectLanguage(text);
            console.log('自动检测到的语言:', detectedLang);
        }
        
        // 映射语言代码 - 确保使用 Chrome API 支持的格式
        fromLang = languageMap[detectedLang] || detectedLang;
        toLang = languageMap[to] || to;

        console.log('语言映射:', { 
            original: { from, to }, 
            detected: detectedLang,
            mapped: { fromLang, toLang }
        });

        // 如果源语言和目标语言相同，不需要翻译
        if (fromLang === toLang) {
            console.log('源语言和目标语言相同，返回原文');
            return text;
        }

        // 执行翻译
        return await performTranslation(text, fromLang, toLang);

    } catch (error) {
        console.error('Chrome Translation API error:', error);
        console.error('错误详情:', {
            error: error,
            message: error instanceof Error ? error.message : '未知错误',
            from: from,
            to: to,
            detectedLang: detectedLang,
            fromLang: fromLang,
            toLang: toLang
        });
        
        // 提供更友好的错误信息
        if (error instanceof Error) {
            if (error.message.includes('not available') || error.message.includes('not ready')) {