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## `weixin/msg.py` — `class:WeixinMsg` (lines 40-337)
```python
class WeixinMsg(object):
def __init__(self, token, sender=None, expires_in=0):
self.token = token
self.sender = sender
self.expires_in = expires_in
self._registry = dict()
def validate(self, signature, timestamp, nonce):
if not self.token:
raise WeixinMsgError("weixin token is missing")
if self.expires_in:
try:
timestamp = int(timestamp)
except ValueError:
return False
delta = time.time() - timestamp
if delta < 0 or delta > self.expires_in:
return False
values = [self.token, str(timestamp), str(nonce)]
s = ''.join(sorted(values))
hsh = hashlib.sha1(s.encode("utf-8")).hexdigest()
return signature == hsh
def parse(self, content):
raw = {}
root = etree.fromstring(content,
parser=etree.XMLParser(resolve_entities=False))
for child in root:
raw[child.tag] = child.text
formatted = self.format(raw)
msg_type = formatted['type']
msg_parser = getattr(self, 'parse_{0}'.format(msg_type), None)
if callable(msg_parser):
parsed = msg_parser(raw)
else:
parsed = self.parse_invalid_type(raw)
formatted.update(parsed)
return formatted
def format(self, kwargs):
timestamp = int(kwargs['CreateTime'])
return {
'id': kwargs.get('MsgId'),
'timestamp': timestamp,
'receiver': kwargs['ToUserName'],
'sender': kwargs['FromUserName'],
'type': kwargs['MsgType'],
'time': datetime.fromtimestamp(timestamp),
}
def parse_text(self, raw):
return {'content': raw['Content']}
def parse_image(self, raw):
return {'picurl': raw['PicUrl']}
def parse_location(self, raw):
return {
'location_x': raw['Location_X'],
'location_y': raw['Location_Y'],
'scale': int(raw.get('Scale', 0)),
'label': raw['Label'],
}
def parse_link(self, raw):
return {
'title': raw['Title'],
'description': raw['Description'],
'url': raw['url'],
}
def parse_voice(self, raw):
return {
'media_id': raw['MediaId'],
'format': raw['Format'],
'recognition': raw['Recognition'],
}
def parse_video(self, raw):
return {
'media_id': raw['MediaId'],
'thumb_media_id': raw['ThumbMediaId'],
}
def parse_shortvideo(self, raw):
return {
'media_id': raw['MediaId'],
'thumb_media_id': raw['ThumbMediaId'],
}
def parse_event(self, raw):
return {
'event': raw.get('Event'),
'event_key': raw.get('EventKey'),
'ticket': raw.get('Ticket'),
'latitude': raw.get('Latitude'),
'longitude': raw.get('Longitude'),
'precision': raw.get('Precision'),
'status': raw.get('status')
}
def parse_invalid_type(self, raw):
return {}
def reply(self, username=None, type='text', sender=None, **kwargs):
if not username:
raise RuntimeError("username is missing")
sender = sender or self.sender
if not sender:
raise RuntimeError('WEIXIN_SENDER or sender argument is missing')
if type == 'text':
content = kwargs.get('content', '')
return text_reply(username, sender, content)
if type == 'music':
values = {}
for k in ('title', 'description', 'music_url', 'hq_music_url'):
values[k] = kwargs[k]
return music_reply(username, sender, **values)
if type == 'news':
items = kwargs['articles']
return news_reply(username, sender, *items)
if type == 'customer_service':
service_account = kwargs['service_account']
return transfer_customer_service_reply(username, sender,
service_account)
if type == 'image':
media_id = kwargs.get('media_id')
return image_reply(username, sender, media_id)
if type == 'voice':
media_id = kwargs.get('media_id')
return voice_reply(username, sender, media_id)
if type == 'video':
values = {}
for k in ('media_id', 'title', 'description'):
values[k] = kwargs[k]
return video_reply(username, sender, **values)
def register(self, type, key=None, func=None):
if func:
key = '*' if not key else key
self._registry.setdefault(type, dict())[key] = func
return func
return self.__call__(type, key)
def __call__(self, type, key):
def wrapper(func):
self.register(type, key, func)
return func
return wrapper
@property
def all(self):
return self.register('*')
def text(self, key='*'):
return self.register('text', key)
def __getattr__(self, key):
key = key.lower()
if key in ['image', 'video', 'voice', 'shortvideo', 'location', 'link', 'event']:
return self.register(key)
if key in ['subscribe', 'unsubscribe', 'location', 'click', 'view', 'scan', \
'scancode_push', 'scancode_waitmsg', 'pic_sysphoto', \
'pic_photo_or_album', 'pic_weixin', 'location_select', \
'qualification_verify_success', 'qualification_verify_fail', 'naming_verify_success', \
'naming_verify_fail', 'annual_renew', 'verify_expired', \
'card_pass_check', 'user_get_card', 'user_del_card', 'user_consume_card', \
'user_pay_from_pay_cell', 'user_view_card', 'user_enter_session_from_card', \
'card_sku_remind']:
return self.register('event', key)
raise AttributeError('invalid attribute "' + key + '"')
def django_view_func(self):
def run(request):
if HttpResponse is None:
raise RuntimeError('django_view_func need Django be installed')
signature = request.GET.get('signature')
timestamp = request.GET.get('timestamp')
nonce = request.GET.get('nonce')
if not self.validate(signature, timestamp, nonce):
return HttpResponseForbidden('signature failed')
if request.method == 'GET':
echostr = request.args.get('echostr', '')
return HttpResponse(echostr)
elif request.method == "POST":
try:
ret = self.parse(request.body)
except ValueError:
return HttpResponseForbidden('invalid')
func = None
type = ret['type']
_registry = self._registry.get(type, dict())
if type == 'text':
if ret['content'] in _registry:
func = _registry[ret['content']]
elif type == 'event':
if ret['event'].lower() in _registry:
func = _registry[ret['event'].lower()]
if func is None and '*' in _registry:
func = _registry['*']
if func is None and '*' in self._registry:
func = self._registry.get('*', dict()).get('*')
text = ''
if func is None:
text = 'failed'
if callable(func):
text = func(**ret)
content = ''
if isinstance(text, basestring):
if text:
content = self.reply(
username=ret['sender'],
sender=ret['receiver'],
content=text,
)
elif isinstance(text, dict):
text.setdefault('username', ret['sender'])
text.setdefault('sender', ret['receiver'])
content = self.reply(**text)
return HttpResponse(content, content_type='text/xml; charset=utf-8')
return HttpResponseNotAllowed(['GET', 'POST'])
return run
def view_func(self):
if request is None:
raise RuntimeError('view_func need Flask be installed')
signature = request.args.get('signature')
timestamp = request.args.get('timestamp')
nonce = request.args.get('nonce')
if not self.validate(signature, timestamp, nonce):
return 'signature failed', 400
if request.method == 'GET':
echostr = request.args.get('echostr', '')
return echostr
try:
ret = self.parse(request.data)
except ValueError:
return 'invalid', 400
func = None
type = ret['type']
_registry = self._registry.get(type, dict())
if type == 'text':
if ret['content'] in _registry:
func = _registry[ret['content']]
elif type == 'event':
if ret['event'].lower() in _registry:
func = _registry[ret['event'].lower()]
if func is None and '*' in _registry:
func = _registry['*']
if func is None and '*' in self._registry:
func = self._registry.get('*', dict()).get('*')
text = ''
if func is None:
text = 'failed'
if callable(func):
text = func(**ret)
content = ''
if isinstance(text, basestring):
if text:
content = self.reply(
username=ret['sender'],
sender=ret['receiver'],
content=text,
)
elif isinstance(text, dict):
text.setdefault('username', ret['sender'])
text.setdefault('sender', ret['receiver'])
content = self.reply(**text)
return Response(content, content_type='text/xml; charset=utf-8')
view_func.methods = ['GET', 'POST']
```
## `weixin/msg.py` — `function:WeixinMsg.parse` (lines 65-81)
```python
def parse(self, content):
raw = {}
root = etree.fromstring(content,
parser=etree.XMLParser(resolve_entities=False))
for child in root:
raw[child.tag] = child.text
formatted = self.format(raw)
msg_type = formatted['type']
msg_parser = getattr(self, 'parse_{0}'.format(msg_type), None)
if callable(msg_parser):
parsed = msg_parser(raw)
else:
parsed = self.parse_invalid_type(raw)
formatted.update(parsed)
return formatted
```
## `weixin/pay.py` — `class:WeixinPay` (lines 40-234)
```python
class WeixinPay(object):
def __init__(self, app_id, mch_id, mch_key, notify_url, key=None, cert=None):
self.app_id = app_id
self.mch_id = mch_id
self.mch_key = mch_key
self.notify_url = notify_url
self.key = key
self.cert = cert
self.sess = requests.Session()
@property
def remote_addr(self):
if request is not None:
return request.remote_addr
return ""
@property
def nonce_str(self):
char = string.ascii_letters + string.digits
return "".join(random.choice(char) for _ in range(32))
def sign(self, raw):
raw = [(k, str(raw[k]) if isinstance(raw[k], int) else raw[k])
for k in sorted(raw.keys())]
s = "&".join("=".join(kv) for kv in raw if kv[1])
s += "&key={0}".format(self.mch_key)
return hashlib.md5(s.encode("utf-8")).hexdigest().upper()
def check(self, data):
sign = data.pop("sign")
return sign == self.sign(data)
def to_xml(self, raw):
s = ""
for k, v in raw.items():
s += "<{0}>{1}</{0}>".format(k, v)
s = "<xml>{0}</xml>".format(s)
return s.encode("utf-8")
def to_dict(self, content):
raw = {}
root = etree.fromstring(content.encode("utf-8"),
parser=etree.XMLParser(resolve_entities=False))
for child in root:
raw[child.tag] = child.text
return raw
def _fetch(self, url, data, use_cert=False):
data.setdefault("appid", self.app_id)
data.setdefault("mch_id", self.mch_id)
data.setdefault("nonce_str", self.nonce_str)
data.setdefault("sign", self.sign(data))
if use_cert:
resp = self.sess.post(url, data=self.to_xml(data), cert=(self.cert, self.key))
else:
resp = self.sess.post(url, data=self.to_xml(data))
content = resp.content.decode("utf-8")
if "return_code" in content:
data = Map(self.to_dict(content))
if data.return_code == FAIL:
raise WeixinPayError(data.return_msg)
if "result_code" in content and data.result_code == FAIL:
raise WeixinPayError(data.err_code_des)
return data
return content
def reply(self, msg, ok=True):
code = SUCCESS if ok else FAIL
return self.to_xml(dict(return_code=code, return_msg=msg))
def unified_order(self, **data):
"""
统一下单
out_trade_no、body、total_fee、trade_type必填
app_id, mchid, nonce_str自动填写
spbill_create_ip 在flask框架下可以自动填写, 非flask框架需要主动传入此参数
"""
url = "https://api.mch.weixin.qq.com/pay/unifiedorder"
# 必填参数
if "out_trade_no" not in data:
raise WeixinPayError("缺少统一支付接口必填参数out_trade_no")
if "body" not in data:
raise WeixinPayError("缺少统一支付接口必填参数body")
if "total_fee" not in data:
raise WeixinPayError("缺少统一支付接口必填参数total_fee")
if "trade_type" not in data:
raise WeixinPayError("缺少统一支付接口必填参数trade_type")
# 关联参数
if data["trade_type"] == "JSAPI" and "openid" not in data:
raise WeixinPayError("trade_type为JSAPI时，openid为必填参数")
if data["trade_type"] == "NATIVE" and "product_id" not in data:
raise WeixinPayError("trade_type为NATIVE时，product_id为必填参数")
data.setdefault("notify_url", self.notify_url)
if "spbill_create_ip" not in data:
data.setdefault("spbill_create_ip", self.remote_addr)
raw = self._fetch(url, data)
return raw
def jsapi(self, **kwargs):
"""
生成给JavaScript调用的数据
详细规则参考 https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=7_7&index=6
"""
kwargs.setdefault("trade_type", "JSAPI")
raw = self.unified_order(**kwargs)
package = "prepay_id={0}".format(raw["prepay_id"])
timestamp = str(int(time.time()))
nonce_str = self.nonce_str
raw = dict(appId=self.app_id, timeStamp=timestamp,
nonceStr=nonce_str, package=package, signType="MD5")
sign = self.sign(raw)
return dict(package=package, appId=self.app_id, signType="MD5",
timeStamp=timestamp, nonceStr=nonce_str, sign=sign)
def order_query(self, **data):
"""
订单查询
out_trade_no, transaction_id至少填一个
appid, mchid, nonce_str不需要填入
"""
url = "https://api.mch.weixin.qq.com/pay/orderquery"
if "out_trade_no" not in data and "transaction_id" not in data:
raise WeixinPayError("订单查询接口中，out_trade_no、transaction_id至少填一个")
return self._fetch(url, data)
def close_order(self, out_trade_no, **data):
"""
关闭订单
out_trade_no必填
appid, mchid, nonce_str不需要填入
"""
url = "https://api.mch.weixin.qq.com/pay/closeorder"
data.setdefault("out_trade_no", out_trade_no)
return self._fetch(url, data)
def refund(self, **data):
"""
申请退款
out_trade_no、transaction_id至少填一个且
out_refund_no、total_fee、refund_fee、op_user_id为必填参数
appid、mchid、nonce_str不需要填入
"""
if not self.key or not self.cert:
raise WeixinError("退款申请接口需要双向证书")
url = "https://api.mch.weixin.qq.com/secapi/pay/refund"
if "out_trade_no" not in data and "transaction_id" not in data:
raise WeixinPayError("退款申请接口中，out_trade_no、transaction_id至少填一个")
if "out_refund_no" not in data:
raise WeixinPayError("退款申请接口中，缺少必填参数out_refund_no");
if "total_fee" not in data:
raise WeixinPayError("退款申请接口中，缺少必填参数total_fee");
if "refund_fee" not in data:
raise WeixinPayError("退款申请接口中，缺少必填参数refund_fee");
return self._fetch(url, data, True)
def refund_query(self, **data):
"""
查询退款
提交退款申请后，通过调用该接口查询退款状态。退款有一定延时，
用零钱支付的退款20分钟内到账，银行卡支付的退款3个工作日后重新查询退款状态。
out_refund_no、out_trade_no、transaction_id、refund_id四个参数必填一个
appid、mchid、nonce_str不需要填入
"""
url = "https://api.mch.weixin.qq.com/pay/refundquery"
if "out_refund_no" not in data and "out_trade_no" not in data \
and "transaction_id" not in data and "refund_id" not in data:
raise WeixinPayError("退款查询接口中，out_refund_no、out_trade_no、transaction_id、refund_id四个参数必填一个")
return self._fetch(url, data)
def download_bill(self, bill_date, bill_type="ALL", **data):
"""
下载对账单
bill_date、bill_type为必填参数
appid、mchid、nonce_str不需要填入
"""
url = "https://api.mch.weixin.qq.com/pay/downloadbill"
data.setdefault("bill_date", bill_date)
data.setdefault("bill_type", bill_type)
if "bill_date" not in data:
raise WeixinPayError("对账单接口中，缺少必填参数bill_date")
return self._fetch(url, data)
```
## `weixin/pay.py` — `function:WeixinPay.to_dict` (lines 80-86)
```python
def to_dict(self, content):
raw = {}
root = etree.fromstring(content.encode("utf-8"),
parser=etree.XMLParser(resolve_entities=False))
for child in root:
raw[child.tag] = child.text
return raw
```
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