Function downloadSingleImage

zpr/zpr.ts:333–425

(
    item: SetuData, 
    index: number, 
    r18: number, 
    currentProxy: string,
    allProxies: string[]
)

    index: number, 
    r18: number, 
    currentProxy: string,
    allProxies: string[]
): Promise<DownloadResult> {
    const { pid, title, width, height, urls } = item;
    const imgName = `${pid}_${index}.jpg`;
    const filePath = path.join(dataPath, imgName);
    
    // 将当前配置的代理放在第一位，其他代理作为备选
    const proxyList = [currentProxy, ...allProxies.filter(proxy => proxy !== currentProxy)];
    
    let lastError: string = "";
    let has404Error = false;
    let hadNetworkFailures = false;  // 跟踪是否遇到过网络错误
    let failedProxies: string[] = [];  // 记录失败的代理
    
    for (const proxyHost of proxyList) {
        try {
            const imgController = new AbortController();
            const clearImgTimeout = scheduleAbort(imgController, 30000, "zpr:image-timeout");
            
            try {
                const imgResponse = await axios.get(urls.regular, {
                    headers: getHeaders(proxyHost),
                    timeout: 30000,
                    responseType: 'arraybuffer',
                    signal: imgController.signal
                });
                
                if (imgResponse.status === 200) {
                    await fs.writeFile(filePath, imgResponse.data as any);
                    
                    return {
                        mediaGroup: {
                            type: 'photo',
                            media: filePath,
                            caption: `<b>🎨 ${htmlEscape(title)}</b>

🆔 <b>作品ID:</b> <a href="https://www.pixiv.net/artworks/${pid}">${pid}</a>
🔗 <b>原图:</b> <a href="${htmlEscape(urls.original)}">高清查看</a>
📐 <b>尺寸:</b> <code>${width}×${height}</code>

<i>📡 来源: Pixiv</i>`,
                            hasSpoiler: r18 === 1
                        },
                        usedProxy: proxyHost,
                        hadNetworkFailures: hadNetworkFailures,  // 报告是否之前有网络错误
                        failedProxies: failedProxies  // 报告失败的代理
                    };
                } else if (imgResponse.status === 404) {
                    has404Error = handle404Error(proxyHost, failedProxies);
                    continue; // 尝试下一个代理
                } else {
                    lastError = `HTTP ${imgResponse.status}`;
                    failedProxies.push(proxyHost);
                    continue; // 尝试下一个代理
                }
            } finally {
                clearImgTimeout();