Method extractMediaInfo

xmsl/xmsl.ts:285–389

* 从消息中提取媒体信息

(message: Api.Message)

		try {
			// 处理图片
			if (message.media instanceof Api.MessageMediaPhoto) {
				const buffer = await client.downloadMedia(message.media, {});
				if (buffer && Buffer.isBuffer(buffer)) {
					const detectedMime = detectImageMime(buffer);
					if (detectedMime) {
						return {
							base64: buffer.toString('base64'),
							mimeType: detectedMime,
							mediaType: 'photo',
						};
					}
				}
			}

			// 处理文档类型（贴纸、图片文件等）
			if (message.media instanceof Api.MessageMediaDocument) {
				const doc = message.media.document;
				if (!(doc instanceof Api.Document)) return null;

				const mimeType = doc.mimeType || '';

				// 检测是否为贴纸
				const isSticker = doc.attributes?.some(
					(a: any) => a instanceof Api.DocumentAttributeSticker
				);

				// TGS 动态贴纸 - 尝试渲染第一帧
				if (mimeType === TGS_MIME) {
					const buffer = await client.downloadMedia(message.media, {});
					if (buffer && Buffer.isBuffer(buffer)) {
						const pngBuffer = await extractTgsFirstFrame(buffer);
						if (pngBuffer) {
							return {
								base64: pngBuffer.toString('base64'),
								mimeType: 'image/png',
								mediaType: 'sticker',
								isAnimated: true,
							};
						}
					}
					return null;
				}

				// 视频贴纸 (WebM) - 提取第一帧
				if (mimeType === WEBM_MIME) {
					const buffer = await client.downloadMedia(message.media, {});
					if (buffer && Buffer.isBuffer(buffer)) {
						const pngBuffer = await extractWebmFirstFrame(buffer);
						if (pngBuffer) {
							return {
								base64: pngBuffer.toString('base64'),
								mimeType: 'image/png',
								mediaType: 'sticker',
								isAnimated: true,
							};
						}
					}