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annotate roundup/cgi/accept_language.py @ 5630:07abc8d36940

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Add etag support to rest interface to prevent multiple users from overwriting other users changes. All GET requests for an object (issue, user, keyword etc.) or a property of an object (e.g the title of an issue) return the etag for the object in the ETag header as well as the @etag field in the returned object. All requests that change existing objects (DELETE, PUT or PATCH) require: 1 A request include an ETag header with the etag value retrieved for the object. 2 A submits a form that includes the field @etag that must have the value retrieved for the object. If an etag is not supplied by one of these methods, or any supplied etag does not match the etag calculated at the time the DELETE, PUT or PATCH request is made, HTTP error 412 (Precondition Failed) is returned and no change is made. At that time the client code should retrieve the object again, reconcile the changes and can try to send a new update. The etag is the md5 hash of the representation (repr()) of the object retrieved from the database.
author John Rouillard <rouilj@ieee.org>
date Fri, 01 Mar 2019 22:57:07 -0500
parents b00cd44fea16
children 936275dfe1fa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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52f89836d05b Parse the Accept-Language header as defined in RFC2616.
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1 """Parse the Accept-Language header as defined in RFC2616.
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2
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3 See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
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4 for details. This module should follow the spec.
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5 Author: Hernan M. Foffani (hfoffani@gmail.com)
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6 Some use samples:
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7
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8 >>> parse("da, en-gb;q=0.8, en;q=0.7")
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9 ['da', 'en_gb', 'en']
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10 >>> parse("en;q=0.2, fr;q=1")
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11 ['fr', 'en']
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12 >>> parse("zn; q = 0.2 ,pt-br;q =1")
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13 ['pt_br', 'zn']
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14 >>> parse("es-AR")
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15 ['es_AR']
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16 >>> parse("es-es-cat")
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17 ['es_es_cat']
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18 >>> parse("")
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19 []
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20 >>> parse(None)
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21 []
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22 >>> parse(" ")
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23 []
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24 >>> parse("en,")
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25 ['en']
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26 """
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27
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28 import re
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29 import heapq
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30
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31 # regexp for languange-range search
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32 nqlre = "([A-Za-z]+[-[A-Za-z]+]*)$"
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33 # regexp for languange-range search with quality value
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34 qlre = "([A-Za-z]+[-[A-Za-z]+]*);q=([\d\.]+)"
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35 # both
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36 lre = re.compile(nqlre + "|" + qlre)
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37
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38 whitespace = ' \t\n\r\v\f'
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39 try:
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40 # Python 3.
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41 remove_ws = (str.maketrans('', '', whitespace),)
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42 except AttributeError:
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43 # Python 2.
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44 remove_ws = (None, whitespace)
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45
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46 def parse(language_header):
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47 """parse(string_with_accept_header_content) -> languages list"""
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48
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49 if language_header is None: return []
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50
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51 # strip whitespaces.
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52 lh = language_header.translate(*remove_ws)
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53
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54 # if nothing, return
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55 if lh == "": return []
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56
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57 # split by commas and parse the quality values.
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58 pls = [lre.findall(x) for x in lh.split(',')]
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59
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60 # drop uncomformant
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61 qls = [x[0] for x in pls if len(x) > 0]
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62
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63 # use a heap queue to sort by quality values.
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64 # the value of each item is 1.0 complement.
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65 pq = []
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66 for l in qls:
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67 if l[0] != '':
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68 heapq.heappush(pq, (0.0, l[0]))
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69 else:
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70 heapq.heappush(pq, (1.0-float(l[2]), l[1]))
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71
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72 # get the languages ordered by quality
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73 # and replace - by _
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74 return [x[1].replace('-','_') for x in pq]
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75
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76 if __name__ == "__main__":
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77 import doctest
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78 doctest.testmod()
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79
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80 # vim: set et sts=4 sw=4 :
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