{"componentChunkName":"component---src-templates-blog-detail-tsx","path":"/blog/2020-04-23-serverless-wechat-cos","result":{"data":{"currentBlog":{"id":"e0959654-d44e-59c0-8201-19822e61b38d","frontmatter":{"thumbnail":"https://img.serverlesscloud.cn/2020523/1590204021386-16200.jpg","authors":["乂乂又又"],"categories":["user-stories"],"date":"2020-04-23T00:00:00.000Z","title":"万物皆可 Serverless 之使用云函数 SCF+COS 免费运营微信公众号","description":"是的，你没听错，这一次我来带大家直接上手运营微信公众号","authorslink":["https://cloud.tencent.com/developer/article/1612816"],"translators":null,"translatorslink":null,"tags":["云函数","对象存储"],"keywords":"Serverless,Serverless微信,Serverless应用","outdated":null},"wordCount":{"words":271,"sentences":67,"paragraphs":67},"fileAbsolutePath":"/opt/build/repo/content/blog/2020-04-23-serverless-wechat-cos.md","fields":{"slug":"/blog/2020-04-23-serverless-wechat-cos/","keywords":["java","python","serverless","腾讯云无服务器云函数","无服务器","无服务器云函数","云函数","reply","requestParameters","微信","timestamp","nonce","signature"]},"html":"

是的，你没听错，这一次我来带大家直接上手运营微信公众号。

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震惊，Awesome，哼，我才不信捏，所谓无图无真相 ~

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效果展示

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\"最终效果1\"

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\"最终效果2\"

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更多的体验，可以关注我的微信公众号： 乂乂又又 （仅供测试，不要乱搞哈~）

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嗯，这次我信了，快点教一下我吧，嘤嘤嘤~

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操作步骤

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在上一篇《万物皆可Serverless之使用SCF+COS快速开发全栈应用》教程中，

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我们用腾讯云无服务器云函数 SCF 和对象存储实现了一个后端云函数，这个云函数可以根据我们的请求返回对应的结果。

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现在我们将尝试在这个云函数的基础上解析微信 XML 消息，实现公众号消息的自动回复，关键词回复，文字菜单等功能。

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第一步：添加相关依赖

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为了快速完成开发，这里我们选择 python 第三方开源库 wechatpy 来接入微信公众平台。

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\"wechatpy\"

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wechatpy 支持以下功能

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    \n
  1. 普通公众平台被动响应和主动调用 API
    2. \n
  2. 企业微信 API
    3. \n
  3. 微信支付 API
    4. \n
  4. 第三方平台代公众号调用接口 API
    5. \n
  5. 小程序云开发 API
    6. \n
\n

可见功能是十分完整的，不仅支持普通公众平台主被动调用，企业微信和微信支付，甚至还支持第三方平台代公众号调用接口，拿来运营微信公众号是十分绰绰有余的~

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\"完整项目依赖\"

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由于腾讯云函数的运行环境中缺少第三方库，需要我们自己手动上传添加依赖，这里我们需要添加的第三方依赖有：wechatpy、otionaldict、xmltodict 以及 timeout\\_decorator

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其中 wechatpy 需要依赖 otionaldict、xmltodict，timeout\\_decorator 是用来限制函数运行时长的，具体的依赖文件可以自行 pip 安装后 copy 到云函数项目根目录，如上图。

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第二步：接入微信公众号

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\"微信公众号开发者后台\"

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这里需要记下自己的 AppID、Token 和 EncodingAESKey，消息加密方式建议选为安全模式。这个页面先不要关，一会儿上线发布好云函数还需要过来再次修改配置。

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第三步：编写云函数解析并回复微信公众号消息

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这一步可以直接参考 wechatpy 的官方文档

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\"wechat文档\"

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Life is short, show me the code.

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这里我就直接上代码了（原始业务代码已略去，可以按照自己的需求开发）

\n 0:\n replyMap = json.loads(replyTxt)\n return replyMap\n\ndef addReplys(reply):\n replyMap = getReplys()\n if len(replyMap) > 0:\n replyMap[reply]='我是黑名单'\n return cosWrite('Replys.txt', json.dumps(replyMap, ensure_ascii=False)) if len(replyMap) > 0 else False\n\n\ndef delReplys(reply):\n replyMap = getReplys()\n if len(replyMap) > 0:\n replyMap.pop(reply)\n return cosWrite('Replys.txt', json.dumps(replyMap, ensure_ascii=False)) if len(replyMap) > 0 else False\n\n\n# 微信公众号对接\nwecaht_id = 'xxxxxxxxxxxxxxx'\nWECHAT_TOKEN = 'xxxxxxxxxxxxxxxxxxx'\nencoding_aes_key = 'xxxxxxxxxxxxxxxxxxxxxx'\n\ncrypto = WeChatCrypto(WECHAT_TOKEN, encoding_aes_key, wecaht_id)\n\n# api网关响应集成\ndef apiReply(reply, txt=False, content_type='application/json', code=200):\n return {\n "isBase64Encoded": False,\n "statusCode": code,\n "headers": {'Content-Type': content_type},\n "body": json.dumps(reply, ensure_ascii=False) if not txt else str(reply)\n }\n\ndef replyMessage(msg):\n txt = msg.content\n ip = msg.source\n print('请求信息--->'+ip+'%'+txt) # 用来在腾讯云控制台打印请求日志\n replysTxtMap = getReplys() # 获取回复关键词\n if '@' in txt:\n keys = txt.split('@')\n if keys[0] == '电影': #do something\n return\n if keys[0] == '音乐': #do something\n return\n if keys[0] == '下架': #do something\n return\n if keys[0] == '上架': #do something\n return\n if keys[0] == '回复': #do something\n return\n if keys[0] == '删除': #do something\n return\n elif txt in replysTxtMap.keys(): # 如果消息在回复关键词内则自动回复\n return create_reply(replysTxtMap[txt], msg)\n return create_reply("喵呜 ฅ'ω'ฅ", msg)\n\ndef wechat(httpMethod, requestParameters, body=''):\n if httpMethod == 'GET':\n signature = requestParameters['signature']\n timestamp = requestParameters['timestamp']\n nonce = requestParameters['nonce']\n echo_str = requestParameters['echostr']\n try:\n check_signature(WECHAT_TOKEN, signature, timestamp, nonce)\n except InvalidSignatureException:\n echo_str = 'error'\n return apiReply(echo_str, txt=True, content_type="text/plain")\n elif httpMethod == 'POST':\n msg_signature = requestParameters['msg_signature']\n timestamp = requestParameters['timestamp']\n nonce = requestParameters['nonce']\n try:\n decrypted_xml = crypto.decrypt_message(\n body,\n msg_signature,\n timestamp,\n nonce\n )\n except (InvalidAppIdException, InvalidSignatureException):\n return\n msg = parse_message(decrypted_xml)\n if msg.type == 'text':\n reply = replyMessage(msg)\n elif msg.type == 'image':\n reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发图片干啥~', msg)\n elif msg.type == 'voice':\n reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发语音干啥~', msg)\n else:\n reply = create_reply('哈◔ ‸◔？\\n搞不明白你给我发了啥~', msg)\n reply = reply.render()\n print('返回结果--->'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")\n else:\n msg = parse_message(body)\n reply = create_reply("喵呜 ฅ'ω'ฅ", msg)\n reply = reply.render()\n print('返回结果--->'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")\n\n\n@timeout_decorator.timeout(4, timeout_exception=StopIteration)\ndef myMain(httpMethod, requestParameters, body=''):\n return wechat(httpMethod, requestParameters, body=body)\n\n\ndef timeOutReply(httpMethod, requestParameters, body=''):\n msg_signature = requestParameters['msg_signature']\n timestamp = requestParameters['timestamp']\n nonce = requestParameters['nonce']\n try:\n decrypted_xml = crypto.decrypt_message(\n body,\n msg_signature,\n timestamp,\n nonce\n )\n except (InvalidAppIdException, InvalidSignatureException):\n return\n msg = parse_message(decrypted_xml)\n reply = create_reply("出了点小问题，请稍后再试", msg).render()\n print('返回结果--->'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")\n\n\ndef main_handler(event, context):\n body = ''\n httpMethod = event["httpMethod"]\n requestParameters = event['queryString']\n if 'body' in event.keys():\n body = event['body']\n try:\n response = myMain(httpMethod, requestParameters, body=body)\n except:\n response = timeOutReply(httpMethod, requestParameters, body=body)\n return response`, `78488859731572160000`)\"\n >\n \n 复制代码\n \n \n
import json\nimport timeout_decorator\nfrom wechatpy.replies import ArticlesReply\nfrom wechatpy.utils import check_signature\nfrom wechatpy.crypto import WeChatCrypto\nfrom wechatpy import parse_message, create_reply\nfrom wechatpy.exceptions import InvalidSignatureException, InvalidAppIdException\n\n# 是否开启本地debug模式\ndebug = False\n\n# 腾讯云对象存储依赖\nif debug:\n    from qcloud_cos import CosConfig\n    from qcloud_cos import CosS3Client\n    from qcloud_cos import CosServiceError\n    from qcloud_cos import CosClientError\nelse:\n    from qcloud_cos_v5 import CosConfig\n    from qcloud_cos_v5 import CosS3Client\n    from qcloud_cos_v5 import CosServiceError\n    from qcloud_cos_v5 import CosClientError\n\n# 配置存储桶\nappid = '66666666666'\nsecret_id = u'xxxxxxxxxxxxxxx'\nsecret_key = u'xxxxxxxxxxxxxxx'\nregion = u'ap-chongqing'\nbucket = 'name'+'-'+appid\n\n# 对象存储实例\nconfig = CosConfig(Secret_id=secret_id, Secret_key=secret_key, Region=region)\nclient = CosS3Client(config)\n\n# cos 文件读写\ndef cosRead(key):\n    try:\n        response = client.get_object(Bucket=bucket, Key=key)\n        txtBytes = response['Body'].get_raw_stream()\n        return txtBytes.read().decode()\n    except CosServiceError as e:\n        return \"\"\n\ndef cosWrite(key, txt):\n    try:\n        response = client.put_object(\n            Bucket=bucket,\n            Body=txt.encode(encoding=\"utf-8\"),\n            Key=key,\n        )\n        return True\n    except CosServiceError as e:\n        return False\n\ndef getReplys():\n    replyMap = {}\n    replyTxt = cosRead('Replys.txt')  # 读取数据\n    if len(replyTxt) > 0:\n        replyMap = json.loads(replyTxt)\n    return replyMap\n\ndef addReplys(reply):\n    replyMap = getReplys()\n    if len(replyMap) > 0:\n        replyMap[reply]='我是黑名单'\n    return cosWrite('Replys.txt', json.dumps(replyMap, ensure_ascii=False)) if len(replyMap) > 0 else False\n\n\ndef delReplys(reply):\n    replyMap = getReplys()\n    if len(replyMap) > 0:\n        replyMap.pop(reply)\n    return cosWrite('Replys.txt', json.dumps(replyMap, ensure_ascii=False)) if len(replyMap) > 0 else False\n\n\n# 微信公众号对接\nwecaht_id = 'xxxxxxxxxxxxxxx'\nWECHAT_TOKEN = 'xxxxxxxxxxxxxxxxxxx'\nencoding_aes_key = 'xxxxxxxxxxxxxxxxxxxxxx'\n\ncrypto = WeChatCrypto(WECHAT_TOKEN, encoding_aes_key, wecaht_id)\n\n# api网关响应集成\ndef apiReply(reply, txt=False, content_type='application/json', code=200):\n    return {\n        \"isBase64Encoded\": False,\n        \"statusCode\": code,\n        \"headers\": {'Content-Type': content_type},\n        \"body\": json.dumps(reply, ensure_ascii=False) if not txt else str(reply)\n    }\n\ndef replyMessage(msg):\n    txt = msg.content\n    ip = msg.source\n    print('请求信息--->'+ip+'%'+txt)  # 用来在腾讯云控制台打印请求日志\n    replysTxtMap = getReplys() # 获取回复关键词\n    if '@' in txt:\n        keys = txt.split('@')\n        if keys[0] == '电影': #do something\n            return\n        if keys[0] == '音乐': #do something\n            return\n        if keys[0] == '下架': #do something\n            return\n        if keys[0] == '上架': #do something\n            return\n        if keys[0] == '回复': #do something\n            return\n        if keys[0] == '删除': #do something\n            return\n    elif txt in replysTxtMap.keys(): # 如果消息在回复关键词内则自动回复\n        return create_reply(replysTxtMap[txt], msg)\n    return create_reply(\"喵呜 ฅ'ω'ฅ\", msg)\n\ndef wechat(httpMethod, requestParameters, body=''):\n    if httpMethod == 'GET':\n        signature = requestParameters['signature']\n        timestamp = requestParameters['timestamp']\n        nonce = requestParameters['nonce']\n        echo_str = requestParameters['echostr']\n        try:\n            check_signature(WECHAT_TOKEN, signature, timestamp, nonce)\n        except InvalidSignatureException:\n            echo_str = 'error'\n        return apiReply(echo_str, txt=True, content_type=\"text/plain\")\n    elif httpMethod == 'POST':\n        msg_signature = requestParameters['msg_signature']\n        timestamp = requestParameters['timestamp']\n        nonce = requestParameters['nonce']\n        try:\n            decrypted_xml = crypto.decrypt_message(\n                body,\n                msg_signature,\n                timestamp,\n                nonce\n            )\n        except (InvalidAppIdException, InvalidSignatureException):\n            return\n        msg = parse_message(decrypted_xml)\n        if msg.type == 'text':\n            reply = replyMessage(msg)\n        elif msg.type == 'image':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发图片干啥~', msg)\n        elif msg.type == 'voice':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发语音干啥~', msg)\n        else:\n            reply = create_reply('哈◔ ‸◔？\\n搞不明白你给我发了啥~', msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")\n    else:\n        msg = parse_message(body)\n        reply = create_reply(\"喵呜 ฅ'ω'ฅ\", msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")\n\n\n@timeout_decorator.timeout(4, timeout_exception=StopIteration)\ndef myMain(httpMethod, requestParameters, body=''):\n    return wechat(httpMethod, requestParameters, body=body)\n\n\ndef timeOutReply(httpMethod, requestParameters, body=''):\n    msg_signature = requestParameters['msg_signature']\n    timestamp = requestParameters['timestamp']\n    nonce = requestParameters['nonce']\n    try:\n        decrypted_xml = crypto.decrypt_message(\n            body,\n            msg_signature,\n            timestamp,\n            nonce\n        )\n    except (InvalidAppIdException, InvalidSignatureException):\n        return\n    msg = parse_message(decrypted_xml)\n    reply = create_reply(\"出了点小问题，请稍后再试\", msg).render()\n    print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n    reply = crypto.encrypt_message(reply, nonce, timestamp)\n    return apiReply(reply, txt=True, content_type=\"application/xml\")\n\n\ndef main_handler(event, context):\n    body = ''\n    httpMethod = event[\"httpMethod\"]\n    requestParameters = event['queryString']\n    if 'body' in event.keys():\n        body = event['body']\n    try:\n        response = myMain(httpMethod, requestParameters, body=body)\n    except:\n        response = timeOutReply(httpMethod, requestParameters, body=body)\n    return response
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请求参数解析和COS读写部分可参考上一篇《万物皆可 Serverless 之使用 SCF+COS 快速开发全栈应用》教程

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下面我来捋一下整个云函数的思路

\n\n \n 复制代码\n \n \n
def main_handler(event, context):\n    body = ''\n    httpMethod = event[\"httpMethod\"]\n    requestParameters = event['queryString']\n    if 'body' in event.keys():\n        body = event['body']\n    try:\n        response = myMain(httpMethod, requestParameters, body=body)\n    except:\n        response = timeOutReply(httpMethod, requestParameters, body=body)\n    return response
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我们先从 main\\_handler 入手，

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这里我们通过 API 网关触发云函数在 event 里拿到了微信公众号请求的方法、头部和请求体，然后传给 myMain 函数做处理，需要注意的是 myMain 是通过 timeout\\_decorator 包装的限时运行函数。

\n\n \n 复制代码\n \n \n
@timeout_decorator.timeout(4, timeout_exception=StopIteration)\ndef myMain(httpMethod, requestParameters, body=''):\n    return wechat(httpMethod, requestParameters, body=body)
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当 myMain 函数运行市场超过设定的 4 秒后，就会抛出异常，

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然后我们可以通过设置一个 timeOutReply 函数来处理超时后的微信公众号消息回复，可是为什么要这么做呢？

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\"函数运行超时后\"

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可以看到，当云函数运行超时后，微信这边就会显示「该公众号提供的服务器出现故障，请稍后再试」

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这对用户体验是极不友好的，所以我们需要一个函数超时后的回复来兜底。

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\"微信消息请求频次\"

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那么对于一次微信公众号后台消息请求多长时间算是超时呢？答案是 5 秒左右，从云函数后台的调用日志我们可以得到这个结果。

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不过需要注意的是对于用户的一次消息请求，微信可能会每隔 1 秒左右重拨一次请求，直到收到服务器第一次响应。另外，超过 3 次应该就不会再重拨了，并且在 5 秒超时后即使云函数调用成功并返回了数据，用户也不会再接收到消息了~

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所以我们就很有必要将自己的云函数的运行时长限制在 5 秒之内了！

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当然只通过配置云函数超时时长得方式来处理是不正确的，因为这样做云函数超时后就被系统停掉了，并不会向微信返回消息。所以从一开始我就导入了 timeout\\_decorator 库来限制主函数的运行时长，并用一个超时后回复函数来兜底。

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另外值得一提的是，在我原始的业务代码中是有一些爬虫，这些爬虫本来我是单线程顺序执行的，考虑到超时问题，我在微信云函数版这里全部改成了多线程运行来压缩时间，所以如果你也有一些比较耗时的小任务话，也可以尝试通过多线程的方式来压缩云函数的运行时长。

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我们接着向下看：

\n'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")\n else:\n msg = parse_message(body)\n reply = create_reply("喵呜 ฅ'ω'ฅ", msg)\n reply = reply.render()\n print('返回结果--->'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")`, `60105980582244520000`)\"\n >\n \n 复制代码\n \n \n
def wechat(httpMethod, requestParameters, body=''):\n    if httpMethod == 'GET':\n        signature = requestParameters['signature']\n        timestamp = requestParameters['timestamp']\n        nonce = requestParameters['nonce']\n        echo_str = requestParameters['echostr']\n        try:\n            check_signature(WECHAT_TOKEN, signature, timestamp, nonce)\n        except InvalidSignatureException:\n            echo_str = 'error'\n        return apiReply(echo_str, txt=True, content_type=\"text/plain\")\n    elif httpMethod == 'POST':\n        msg_signature = requestParameters['msg_signature']\n        timestamp = requestParameters['timestamp']\n        nonce = requestParameters['nonce']\n        try:\n            decrypted_xml = crypto.decrypt_message(\n                body,\n                msg_signature,\n                timestamp,\n                nonce\n            )\n        except (InvalidAppIdException, InvalidSignatureException):\n            return\n        msg = parse_message(decrypted_xml)\n        if msg.type == 'text':\n            reply = replyMessage(msg)\n        elif msg.type == 'image':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发图片干啥~', msg)\n        elif msg.type == 'voice':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发语音干啥~', msg)\n        else:\n            reply = create_reply('哈◔ ‸◔？\\n搞不明白你给我发了啥~', msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")\n    else:\n        msg = parse_message(body)\n        reply = create_reply(\"喵呜 ฅ'ω'ฅ\", msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")
\n

这里的 wechat 函数就是整个微信消息的解析过程，首先判断请求方法是 GET 还是 POST，GET 方法只在第一次绑定微信后台时会用到，这时我们会从微信服务器推送的请求参数中拿到 signature, timestamp, echostr 和 nonce 参数，

\n\n \n 复制代码\n \n \n
check_signature(WECHAT_TOKEN, signature, timestamp, nonce)
\n

我们只需根据自己的公众号 token 和来生成签名与微信服务器传过来的 signature 对比看是否一致，若一致就说明我们的消息加解密验证是OK的，然后再将 echostr 原样返回即可接入微信公众号后台。

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接入好微信公众号后，如果有用户在后台给我们发送消息，这里云函数收到的就是 POST 方法，

\n'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")`, `39671147880150180000`)\"\n >\n \n 复制代码\n \n \n
elif httpMethod == 'POST':\n        msg_signature = requestParameters['msg_signature']\n        timestamp = requestParameters['timestamp']\n        nonce = requestParameters['nonce']\n        try:\n            decrypted_xml = crypto.decrypt_message(\n                body,\n                msg_signature,\n                timestamp,\n                nonce\n            )\n        except (InvalidAppIdException, InvalidSignatureException):\n            return\n        msg = parse_message(decrypted_xml)\n        if msg.type == 'text':\n            reply = replyMessage(msg)\n        elif msg.type == 'image':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发图片干啥~', msg)\n        elif msg.type == 'voice':\n            reply = create_reply('哈◔ ‸◔？\\n好端端的，给我发语音干啥~', msg)\n        else:\n            reply = create_reply('哈◔ ‸◔？\\n搞不明白你给我发了啥~', msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")
\n

然后我们根据前面在微信公众号后台拿到的 id，token 和 aes 加密 key 来初始化消息加解密实例并解密还原用户发送的消息

\n\n \n 复制代码\n \n \n
# 微信公众号对接\nwecaht_id = 'xxxxxxxxxxxxxxx'\nWECHAT_TOKEN = 'xxxxxxxxxxxxxxxxxxx'\nencoding_aes_key = 'xxxxxxxxxxxxxxxxxxxxxx'\n\ncrypto = WeChatCrypto(WECHAT_TOKEN, encoding_aes_key, wecaht_id)
\n

接着判断一下消息类型，不同类型的消息可自行处理

\n\n \n 复制代码\n \n \n
        msg = parse_message(decrypted_xml)\n        if msg.type == 'text':\n            reply = replyMessage(msg)\n        elif msg.type == 'image':\n            reply = create_reply('哈◔ ‸◔？ 好端端的，给我发图片干啥~', msg)\n        elif msg.type == 'voice':\n            reply = create_reply('哈◔ ‸◔？ 好端端的，给我发语音干啥~', msg)\n        else:\n            reply = create_reply('哈◔ ‸◔？ 搞不明白你给我发了啥~', msg)
\n

需要注意的是当一个用户新关注自己的公众号时，我们收到的是一个其他类型的消息，也就是上面的最后一个判断项，这里你可以自己设置新关注用户的欢迎语

\n'+str(reply)) # 用来在腾讯云控制台打印请求日志\n reply = crypto.encrypt_message(reply, nonce, timestamp)\n return apiReply(reply, txt=True, content_type="application/xml")`, `32539694174242185000`)\"\n >\n \n 复制代码\n \n \n
        reply = create_reply('哈◔ ‸◔？\\n搞不明白你给我发了啥~', msg)\n        reply = reply.render()\n        print('返回结果--->'+str(reply))  # 用来在腾讯云控制台打印请求日志\n        reply = crypto.encrypt_message(reply, nonce, timestamp)\n        return apiReply(reply, txt=True, content_type=\"application/xml\")
\n

之后我们通过 create\\_reply 来快速创建一个文本回复，并通过 render() 来生成 xml 回复消息文本。因为我之前在后台设置的是安全模式，所以还需要把 xml 重新通过 crypto.encrypt\\_message 方法加密，然后才能把加密后的回复消息返回给微信服务器。

\n

上一篇文章我有提到我们不能直接返回消息，需要按照特定的格式返回数据（API 网关需要开启响应集成）

\n\n \n 复制代码\n \n \n
# api网关响应集成\ndef apiReply(reply, txt=False, content_type='application/json', code=200):\n    return {\n        \"isBase64Encoded\": False,\n        \"statusCode\": code,\n        \"headers\": {'Content-Type': content_type},\n        \"body\": json.dumps(reply, ensure_ascii=False) if not txt else str(reply)\n    }
\n

第四步：上线发布云函数、添加 API 网关触发器、启用响应集成

\n

参考上一篇教程 《万物皆可 Serverless 之使用 SCF+COS 快速开发全栈应用》

\n

第五步：修改微信公众号后台服务器配置

\n

终于到最后一步了，如果你已经上线发布了好自己的云函数，那么快去微信公众号后台绑定一下自己的后台服务器配置吧~

\n

\"后台服务器配置\"

\n

呼~ 大功告成

\n
\n
\n
\n
\n

传送门：

\n\n
\n

欢迎访问：Serverless 中文网，您可以在 最佳实践 里体验更多关于 Serverless 应用的开发！

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