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在当今数字化的商业环境中，实时获取亚马逊商品数据对于市场分析、竞品监控和价格追踪至关重要。亚马逊提供了官方的 SP-API (Selling Partner API)，允许开发者合法地获取商品信息。本文将介绍如何使用 Python 接入亚马逊 SP-API，实现商品详情的实时数据采集。

前期准备

在开始开发之前，需要完成以下准备工作：

1. 注册亚马逊api请求账户
2. 申请接口账号
3. 创建 SP-API 应用并获取必要的凭证
4. 安装必要的 Python 库

接入亚马逊 SP-API 的步骤

亚马逊 SP-API 采用 OAuth 2.0 认证机制，主要包括以下几个步骤：

1. 生成 LWA (Login with Amazon) 访问令牌
2. 生成 API 请求签名
3. 调用商品信息相关的 API 端点

下面是一个完整的 Python 实现示例：

import requests
import time
import hmac
import hashlib
import base64
import json
from urllib.parse import quote_plus
from datetime import datetimeclass AmazonProductDataCollector:def __init__(self, config):"""初始化亚马逊数据采集器"""self.client_id = config['client_id']self.client_secret = config['client_secret']self.refresh_token = config['refresh_token']self.access_key = config['access_key']self.secret_key = config['secret_key']self.role_arn = config['role_arn']self.region = config['region']self.marketplace_id = config['marketplace_id']# API端点self.lwa_endpoint = "https://api.amazon.com/auth/o2/token"self.api_endpoint = f"https://sellingpartnerapi-{self.region}.amazon.com"# 缓存的访问令牌self.access_token = Noneself.token_expiry = 0# 获取STS凭证self.sts_credentials = self._get_sts_credentials()def _get_sts_credentials(self):"""获取AWS STS凭证"""url = "https://sts.amazonaws.com/"timestamp = datetime.utcnow().strftime("%Y-%m-%dT%H:%M:%SZ")# 构建查询字符串query_params = {"Action": "AssumeRole","DurationSeconds": "3600","RoleArn": self.role_arn,"RoleSessionName": "amazon-api-session","Version": "2011-06-15","X-Amz-Algorithm": "AWS4-HMAC-SHA256","X-Amz-Credential": f"{self.access_key}/{timestamp[:10]}/{self.region}/sts/aws4_request","X-Amz-Date": timestamp,"X-Amz-SignedHeaders": "host"}# 排序参数并构建待签名字符串sorted_params = sorted(query_params.items())canonical_querystring = "&".join([f"{k}={quote_plus(str(v))}" for k, v in sorted_params])# 构建规范请求canonical_request = f"GET\n/\n{canonical_querystring}\nhost:sts.amazonaws.com\n\nhost\nUNSIGNED-PAYLOAD"# 构建待签名字符串string_to_sign = f"AWS4-HMAC-SHA256\n{timestamp}\n{timestamp[:10]}/{self.region}/sts/aws4_request\n{hashlib.sha256(canonical_request.encode()).hexdigest()}"# 计算签名k_date = self._sign(f"AWS4{self.secret_key}", timestamp[:10])k_region = self._sign(k_date, self.region)k_service = self._sign(k_region, "sts")k_signing = self._sign(k_service, "aws4_request")signature = self._sign(k_signing, string_to_sign, hex=True)# 发送请求url_with_params = f"{url}?{canonical_querystring}&X-Amz-Signature={signature}"response = requests.get(url_with_params)if response.status_code == 200:data = response.json()credentials = data["AssumeRoleResponse"]["AssumeRoleResult"]["Credentials"]return {"access_key": credentials["AccessKeyId"],"secret_key": credentials["SecretAccessKey"],"session_token": credentials["SessionToken"],"expiration": credentials["Expiration"]}else:raise Exception(f"获取STS凭证失败: {response.text}")def _get_access_token(self):"""获取LWA访问令牌"""# 检查缓存的令牌是否有效if time.time() < self.token_expiry and self.access_token:return self.access_token# 构建请求体payload = {"grant_type": "refresh_token","refresh_token": self.refresh_token,"client_id": self.client_id,"client_secret": self.client_secret}# 发送请求response = requests.post(self.lwa_endpoint, data=payload)if response.status_code == 200:data = response.json()self.access_token = data["access_token"]self.token_expiry = time.time() + data["expires_in"] - 60  # 提前60秒过期return self.access_tokenelse:raise Exception(f"获取访问令牌失败: {response.text}")def _sign(self, key, msg, hex=False):"""计算HMAC签名"""if hex:return hmac.new(key.encode(), msg.encode(), hashlib.sha256).hexdigest()else:return hmac.new(key.encode(), msg.encode(), hashlib.sha256).digest()def _generate_aws_v4_signature(self, method, endpoint, path, query_params, headers, payload):"""生成AWS V4签名"""# 构建规范请求canonical_headers = "\n".join([f"{k.lower()}:{v}" for k, v in sorted(headers.items())])signed_headers = ";".join([k.lower() for k in sorted(headers.keys())])# 构建规范查询字符串canonical_querystring = "&".join([f"{k}={quote_plus(str(v))}" for k, v in sorted(query_params.items())])# 计算payload哈希payload_hash = hashlib.sha256(json.dumps(payload).encode() if payload else b'').hexdigest()# 构建规范请求canonical_request = f"{method}\n{path}\n{canonical_querystring}\n{canonical_headers}\n\n{signed_headers}\n{payload_hash}"# 构建待签名字符串timestamp = headers["x-amz-date"]credential_scope = f"{timestamp[:8]}/{self.region}/execute-api/aws4_request"string_to_sign = f"AWS4-HMAC-SHA256\n{timestamp}\n{credential_scope}\n{hashlib.sha256(canonical_request.encode()).hexdigest()}"# 计算签名k_date = self._sign(f"AWS4{self.sts_credentials['secret_key']}", timestamp[:8])k_region = self._sign(k_date, self.region)k_service = self._sign(k_region, "execute-api")k_signing = self._sign(k_service, "aws4_request")signature = self._sign(k_signing, string_to_sign, hex=True)return signaturedef get_product_details(self, asin_list):"""获取商品详情"""# 获取访问令牌access_token = self._get_access_token()# 构建请求path = "/products/pricing/v0/price"url = f"{self.api_endpoint}{path}"# 构建查询参数query_params = {"MarketplaceId": self.marketplace_id,"ASIN": ",".join(asin_list)}# 构建请求头timestamp = datetime.utcnow().strftime("%Y%m%dT%H%M%SZ")headers = {"host": f"sellingpartnerapi-{self.region}.amazon.com","x-amz-date": timestamp,"Authorization": f"Bearer {access_token}","x-amz-access-token": access_token,"x-amz-security-token": self.sts_credentials["session_token"]}# 生成签名signature = self._generate_aws_v4_signature("GET", self.api_endpoint, path, query_params, headers, None)# 添加授权头headers["Authorization"] = (f"AWS4-HMAC-SHA256 "f"Credential={self.sts_credentials['access_key']}/{timestamp[:8]}/{self.region}/execute-api/aws4_request, "f"SignedHeaders={';'.join(sorted(headers.keys()))}, "f"Signature={signature}")# 发送请求response = requests.get(url, params=query_params, headers=headers)if response.status_code == 200:return response.json()else:raise Exception(f"获取商品详情失败: {response.text}")def get_product_listings(self, seller_sku_list):"""获取商品列表信息"""# 获取访问令牌access_token = self._get_access_token()# 构建请求path = "/listings/v2/items"url = f"{self.api_endpoint}{path}"# 构建请求头timestamp = datetime.utcnow().strftime("%Y%m%dT%H%M%SZ")headers = {"host": f"sellingpartnerapi-{self.region}.amazon.com","x-amz-date": timestamp,"Authorization": f"Bearer {access_token}","x-amz-access-token": access_token,"x-amz-security-token": self.sts_credentials["session_token"],"Content-Type": "application/json"}# 构建请求体payload = {"marketplaceIds": [self.marketplace_id],"sku": seller_sku_list}# 生成签名signature = self._generate_aws_v4_signature("POST", self.api_endpoint, path, {}, headers, payload)# 添加授权头headers["Authorization"] = (f"AWS4-HMAC-SHA256 "f"Credential={self.sts_credentials['access_key']}/{timestamp[:8]}/{self.region}/execute-api/aws4_request, "f"SignedHeaders={';'.join(sorted(headers.keys()))}, "f"Signature={signature}")# 发送请求response = requests.post(url, headers=headers, json=payload)if response.status_code == 200:return response.json()else:raise Exception(f"获取商品列表信息失败: {response.text}")# 使用示例
if __name__ == "__main__":# 配置信息config = {"client_id": "YOUR_CLIENT_ID","client_secret": "YOUR_CLIENT_SECRET","refresh_token": "YOUR_REFRESH_TOKEN","access_key": "YOUR_AWS_ACCESS_KEY","secret_key": "YOUR_AWS_SECRET_KEY","role_arn": "YOUR_IAM_ROLE_ARN","region": "us-east-1",  # 根据你的区域选择"marketplace_id": "ATVPDKIKX0DER"  # 美国市场}# 初始化采集器collector = AmazonProductDataCollector(config)# 获取商品详情示例asin_list = ["B07W2N765K", "B07Q9KX7J1"]  # 示例ASINproduct_details = collector.get_product_details(asin_list)print("商品详情:")print(json.dumps(product_details, indent=2))# 获取商品列表信息示例seller_sku_list = ["SKU001", "SKU002"]  # 示例SKUproduct_listings = collector.get_product_listings(seller_sku_list)print("商品列表信息:")print(json.dumps(product_listings, indent=2))

 

代码解析

上面的代码实现了一个完整的亚马逊商品数据采集器，主要功能包括：

1. 认证与授权：

   • 使用 LWA (Login with Amazon) 获取访问令牌
   • 通过 AWS STS 获取临时凭证
   • 实现 AWS V4 签名算法

2. API 调用：

   • get_product_details() - 获取指定 ASIN 的商品价格和可用性信息
   • get_product_listings() - 获取卖家 SKU 的商品列表信息

3. 请求处理：

   • 处理请求头、参数和签名
   • 处理响应并返回结构化数据

使用说明

1. 首先需要在亚马逊开发者中心注册并创建应用，获取必要的凭证
2. 将凭证填入配置部分的相应字段
3. 安装必要的依赖：pip install requests
4. 运行代码，指定要查询的 ASIN 或卖家 SKU

注意事项

1. 亚马逊 SP-API 有严格的使用限制和请求频率限制，需要合理规划 API 调用
2. 处理错误和异常情况，特别是网络问题和认证失效
3. 对于大规模数据采集，考虑使用队列和异步处理
4. 保护好 API 凭证，避免泄露
5. 遵守亚马逊的 API 使用条款，不要用于非法目的

扩展功能

你可以基于这个基础框架扩展更多功能：

1. 添加数据存储功能，将采集的数据保存到数据库
2. 实现定时任务，定期采集商品数据
3. 添加数据可视化功能，分析价格趋势
4. 实现自动邮件通知，当商品价格变动时发送通知

通过亚马逊官方 API 采集商品数据是一种合法、稳定的方式，可以为电商分析、价格监控和市场调研提供有力支持。