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annotate roundup/mlink_expr.py @ 6681:ab2ed11c021e

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issue2551205: Add support for specifying valid origins for api: xmlrpc/rest We now have an allow list to filter the hosts allowed to do api requests. An element of this allow list must match the http ORIGIN header exactly or the rest/xmlrpc CORS request will result in an error. The tracker host is always allowed to do a request.
author John Rouillard <rouilj@ieee.org>
date Tue, 17 May 2022 17:18:51 -0400
parents a0c0ee3ed8b1
children 7b090bb35c25
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1 #
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2 # Copyright: 2010 Intevation GmbH.
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3 # 2021 Ralf Schlatterbeck, rsc@runtux.com.
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4 #
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5
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6 # This module is Free Software under the Roundup licensing,
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7 # see the COPYING.txt file coming with Roundup.
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8 #
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9
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10 class Binary:
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11
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12 def __init__(self, x, y):
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13 self.x = x
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14 self.y = y
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15
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16 def visit(self, visitor):
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17 self.x.visit(visitor)
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18 self.y.visit(visitor)
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19
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20 class Unary:
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21
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22 def __init__(self, x):
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23 self.x = x
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24
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25 def generate(self, atom):
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26 return atom(self)
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27
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28 def visit(self, visitor):
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29 self.x.visit(visitor)
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30
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31 class Equals(Unary):
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32
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33 def evaluate(self, v):
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34 return self.x in v
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35
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36 def visit(self, visitor):
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37 visitor(self)
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38
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39 class Empty(Unary):
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40
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41 def evaluate(self, v):
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42 return not v
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43
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44 def visit(self, visitor):
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45 visitor(self)
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46
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47 class Not(Unary):
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48
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49 def evaluate(self, v):
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50 return not self.x.evaluate(v)
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51
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52 def generate(self, atom):
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53 return "NOT(%s)" % self.x.generate(atom)
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54
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55 class Or(Binary):
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56
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57 def evaluate(self, v):
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58 return self.x.evaluate(v) or self.y.evaluate(v)
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59
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60 def generate(self, atom):
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61 return "(%s)OR(%s)" % (
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62 self.x.generate(atom),
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63 self.y.generate(atom))
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64
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65 class And(Binary):
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66
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67 def evaluate(self, v):
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68 return self.x.evaluate(v) and self.y.evaluate(v)
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69
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70 def generate(self, atom):
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71 return "(%s)AND(%s)" % (
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72 self.x.generate(atom),
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73 self.y.generate(atom))
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74
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75 def compile_expression(opcodes):
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76
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77 stack = []
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78 push, pop = stack.append, stack.pop
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79 for opcode in opcodes:
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80 if opcode == -1: push(Empty(opcode))
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81 elif opcode == -2: push(Not(pop()))
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82 elif opcode == -3: push(And(pop(), pop()))
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83 elif opcode == -4: push(Or(pop(), pop()))
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84 else: push(Equals(opcode))
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85
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86 return pop()
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87
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88 class Expression:
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89
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90 def __init__(self, v, is_link=False):
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91 try:
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92 opcodes = [int(x) for x in v]
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93 if min(opcodes) >= -1:
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94 raise ValueError()
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95
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96 compiled = compile_expression(opcodes)
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97 if is_link:
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98 self.evaluate = lambda x: compiled.evaluate(
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99 x and [int(x)] or [])
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100 else:
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101 self.evaluate = lambda x: compiled.evaluate([int(y) for y in x])
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102 except:
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103 if is_link:
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104 v = [None if x == '-1' else x for x in v]
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105 self.evaluate = lambda x: x in v
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106 elif '-1' in v:
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107 v = [x for x in v if int(x) > 0]
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108 self.evaluate = lambda x: bool(set(x) & set(v)) or not x
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109 else:
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110 self.evaluate = lambda x: bool(set(x) & set(v))
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