|
| 1 | +from datetime import datetime |
| 2 | +from datetime import timedelta |
1 | 3 | from decimal import Decimal |
2 | | -from lxml import etree |
3 | | -import re |
4 | | -import requests |
5 | | -from .utils import get_setting |
6 | | - |
7 | | -ENDPOINT = 'http://production.shippingapis.com/ShippingAPI.dll' |
8 | | -DOMESTIC_REQUEST = """<RateV4Request USERID="%(userid)s"> |
9 | | - <Revision>2</Revision> |
10 | | - <Package ID="0"> |
11 | | - <Service>%(service)s</Service> |
12 | | - <ZipOrigination>%(origin_zip)s</ZipOrigination> |
13 | | - <ZipDestination>%(destination_zip)s</ZipDestination> |
14 | | - <Pounds>%(pounds)s</Pounds> |
15 | | - <Ounces>%(ounces)s</Ounces> |
16 | | - <Container></Container> |
17 | | - <Size>REGULAR</Size> |
18 | | - </Package> |
19 | | -</RateV4Request> |
20 | | -""" |
21 | | -INTL_REQUEST = """<IntlRateV2Request USERID="%(userid)s"> |
22 | | - <Revision>2</Revision> |
23 | | - <Package ID="0"> |
24 | | - <Pounds>%(pounds)s</Pounds> |
25 | | - <Ounces>%(ounces)s</Ounces> |
26 | | - <MailType>Package</MailType> |
27 | | - <ValueOfContents></ValueOfContents> |
28 | | - <Country>%(country)s</Country> |
29 | | - <Container></Container> |
30 | | - <Size>REGULAR</Size> |
31 | | - <Width></Width> |
32 | | - <Length></Length> |
33 | | - <Height></Height> |
34 | | - <Girth></Girth> |
35 | | - <OriginZip>%(origin_zip)s</OriginZip> |
36 | | - </Package> |
37 | | -</IntlRateV2Request> |
38 | | -""" |
39 | | - |
40 | | -WHITESPACE_RE = re.compile(r'\s+') |
41 | | - |
| 4 | +import threading |
42 | 5 |
|
43 | | -def call_usps_api(api, request, params): |
44 | | - params = params.copy() |
45 | | - params.update({ |
46 | | - 'userid': get_setting('usps_userid'), |
47 | | - 'origin_zip': get_setting('ship_from_zip'), |
48 | | - }) |
49 | | - request = (request % params).replace('\n', '') |
50 | | - request = WHITESPACE_RE.sub(' ', request) |
51 | | - res = requests.get(ENDPOINT, params={ |
52 | | - 'API': api, |
53 | | - 'XML': request, |
54 | | - }) |
55 | | - tree = etree.fromstring(res.content) |
56 | | - error = None |
57 | | - if tree.tag == 'Error': |
58 | | - error = tree |
59 | | - else: |
60 | | - error = tree.find('.//Error') |
61 | | - if error is not None: |
62 | | - raise Exception('USPS Error: %s' % error.find('Description').text) |
63 | | - return tree |
| 6 | +import requests |
64 | 7 |
|
| 8 | +from .config import SHIPPING_COUNTRIES |
| 9 | +from .utils import get_setting |
65 | 10 |
|
66 | | -def expand_weight(weight): |
67 | | - pounds = int(weight) |
68 | | - ounces = (weight - int(weight)) * 16 |
69 | | - return pounds, ounces |
| 11 | +ENDPOINT = "https://apis.usps.com" |
| 12 | +USPS_COUNTRY_MAP = dict(SHIPPING_COUNTRIES) |
| 13 | +USPS_TOKEN = {} |
| 14 | +token_update_lock = threading.Lock() |
70 | 15 |
|
71 | 16 |
|
72 | | -def calculate_domestic_usps_rate(weight, service_type, destination_zip): |
73 | | - pounds, ounces = expand_weight(weight) |
74 | | - usps_services = {'USPS Priority Mail' : 'PRIORITY', |
75 | | - 'USPS Media Mail' : 'MEDIA'} |
76 | | - params = { |
77 | | - 'destination_zip': destination_zip, |
78 | | - 'pounds': pounds, |
79 | | - 'ounces': ounces, |
80 | | - 'service': usps_services[service_type], |
81 | | - } |
82 | | - res = call_usps_api('RateV4', DOMESTIC_REQUEST, params) |
83 | | - rate = res.find('.//Postage/Rate').text |
84 | | - return Decimal(rate) |
| 17 | +def get_usps_access_token(): |
| 18 | + """Get USPS OAuth access token. |
| 19 | + Cache it in a global variable until it expires. |
| 20 | + """ |
| 21 | + token = USPS_TOKEN |
| 22 | + with token_update_lock: |
| 23 | + if not token or token["expires_at"] < datetime.now(): |
| 24 | + response = requests.post( |
| 25 | + f"{ENDPOINT}/oauth2/v3/token", |
| 26 | + json={ |
| 27 | + "grant_type": "client_credentials", |
| 28 | + "client_id": get_setting('usps_consumer_key'), |
| 29 | + "client_secret": get_setting('usps_consumer_secret'), |
| 30 | + }, |
| 31 | + ) |
| 32 | + response.raise_for_status() |
| 33 | + token.update(response.json()) |
| 34 | + token["expires_at"] = ( |
| 35 | + datetime.fromtimestamp(int(token["issued_at"]) / 1000) + |
| 36 | + timedelta(seconds=int(token["expires_in"]) - 60) |
| 37 | + ) |
| 38 | + return token["access_token"] |
85 | 39 |
|
86 | 40 |
|
87 | | -def calculate_international_usps_rate(weight, country): |
88 | | - pounds, ounces = expand_weight(weight) |
89 | | - params = { |
90 | | - 'country': country, |
91 | | - 'pounds': pounds, |
92 | | - 'ounces': ounces, |
| 41 | +def calculate_usps_rate(weight, service_type, country, zipcode): |
| 42 | + access_token = get_usps_access_token() |
| 43 | + origin_zip = get_setting('ship_from_zip') |
| 44 | + options = { |
| 45 | + "priceType": "RETAIL", |
| 46 | + "processingCategory": "NONSTANDARD", |
| 47 | + "rateIndicator": "SP", # single piece (not flat rate box or envelope) |
| 48 | + "destinationEntryFacilityType": "NONE", |
| 49 | + "originZIPCode": origin_zip, |
| 50 | + "weight": weight, |
| 51 | + "width": 1, |
| 52 | + "height": 12, |
| 53 | + "length": 12, |
93 | 54 | } |
94 | | - res = call_usps_api('IntlRateV2', INTL_REQUEST, params) |
95 | | - # get the rate for Priority Mail International |
96 | | - rate = res.find('.//Service[@ID="2"]').find('Postage').text |
97 | | - return Decimal(rate) |
98 | | - |
99 | 55 |
|
100 | | -def calculate_usps_rate(weight, service_type, country, zip): |
101 | | - if country == 'United States': |
102 | | - return calculate_domestic_usps_rate(weight, service_type, zip) |
| 56 | + if country == "United States": |
| 57 | + if not zipcode: |
| 58 | + return None |
| 59 | + endpoint = f"{ENDPOINT}/prices/v3/base-rates/search" |
| 60 | + options["destinationZIPCode"] = zipcode |
| 61 | + if service_type == "USPS Media Mail": |
| 62 | + options["mailClass"] = "MEDIA_MAIL" |
| 63 | + else: |
| 64 | + options["mailClass"] = "PRIORITY_MAIL" |
103 | 65 | else: |
104 | | - return calculate_international_usps_rate(weight, country) |
| 66 | + endpoint = f"{ENDPOINT}/international-prices/v3/base-rates/search" |
| 67 | + options["destinationCountryCode"] = USPS_COUNTRY_MAP[country] |
| 68 | + if zipcode: |
| 69 | + options["foreignPostalCode"] = zipcode |
| 70 | + options["mailClass"] = "PRIORITY_MAIL_INTERNATIONAL" |
| 71 | + response = requests.post( |
| 72 | + endpoint, |
| 73 | + json=options, |
| 74 | + headers={"Authorization": f"Bearer {access_token}"}, |
| 75 | + ) |
| 76 | + try: |
| 77 | + response.raise_for_status() |
| 78 | + except Exception as err: |
| 79 | + try: |
| 80 | + message = response.json()["error"]["message"] |
| 81 | + except Exception: |
| 82 | + message = str(err) |
| 83 | + raise Exception(f"USPS error: {message}") |
| 84 | + return Decimal(response.json()["totalBasePrice"]) |
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