扫脸支付促销活动

// 前端部分
async function startFacePayment() {
    const video = document.getElementById('video');
    const canvas = document.getElementById('canvas');
    const stream = await navigator.mediaDevices.getUserMedia({ video: true });
    video.srcObject = stream;
    video.play();

    video.addEventListener('play', () => {
        const width = video.videoWidth;
        const height = video.videoHeight;
        canvas.width = width;
        canvas.height = height;
        const ctx = canvas.getContext('2d');
        setInterval(() => {
            ctx.drawImage(video, 0, 0, width, height);
            // 将canvas图像数据发送到后端进行人脸识别
            sendImageDataToServer(canvas.toDataURL());
        }, 1000);
    });
}

function sendImageDataToServer(imageData) {
    fetch('/api/face-recognition', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json'
        },
        body: JSON.stringify({ image: imageData })
    }).then(response => response.json())
      .then(data => {
          if (data.success) {
              // 完成支付流程
              completePayment();
          } else {
              alert('人脸识别失败，请重试');
          }
      });
}

function completePayment() {
    // 实现支付完成后的逻辑
    console.log('支付成功！');
}

# 后端部分（Python Flask示例）
from flask import Flask, request, jsonify
import face_recognition

app = Flask(__name__)

@app.route('/api/face-recognition', methods=['POST'])
def face_recognition_route():
    image_data = request.json['image']
    # 解码图像数据并进行人脸识别
    image = face_recognition.load_image_file(image_data)
    face_encodings = face_recognition.face_encodings(image)
    
    if len(face_encodings) > 0:
        # 假设已有一个已知人脸编码库
        known_face_encodings = [...]
        for face_encoding in face_encodings:
            matches = face_recognition.compare_faces(known_face_encodings, face_encoding)
            if any(matches):
                return jsonify({'success': True})
        return jsonify({'success': False})
    else:
        return jsonify({'success': False})

if __name__ == '__main__':
    app.run(debug=True)