root / snf-pithos-backend / pithos / backends / lib / sqlalchemy / permissions.py @ a74ba506
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1 | 2e662088 | Antony Chazapis | # Copyright 2011-2012 GRNET S.A. All rights reserved.
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2 | 4f917833 | Sofia Papagiannaki | #
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3 | 4f917833 | Sofia Papagiannaki | # Redistribution and use in source and binary forms, with or
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4 | 4f917833 | Sofia Papagiannaki | # without modification, are permitted provided that the following
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5 | 4f917833 | Sofia Papagiannaki | # conditions are met:
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6 | 4f917833 | Sofia Papagiannaki | #
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7 | 4f917833 | Sofia Papagiannaki | # 1. Redistributions of source code must retain the above
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8 | 4f917833 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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9 | 4f917833 | Sofia Papagiannaki | # disclaimer.
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10 | 4f917833 | Sofia Papagiannaki | #
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11 | 4f917833 | Sofia Papagiannaki | # 2. Redistributions in binary form must reproduce the above
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12 | 4f917833 | Sofia Papagiannaki | # copyright notice, this list of conditions and the following
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13 | 4f917833 | Sofia Papagiannaki | # disclaimer in the documentation and/or other materials
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14 | 4f917833 | Sofia Papagiannaki | # provided with the distribution.
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15 | 4f917833 | Sofia Papagiannaki | #
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16 | 4f917833 | Sofia Papagiannaki | # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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17 | 4f917833 | Sofia Papagiannaki | # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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18 | 4f917833 | Sofia Papagiannaki | # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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19 | 4f917833 | Sofia Papagiannaki | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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20 | 4f917833 | Sofia Papagiannaki | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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21 | 4f917833 | Sofia Papagiannaki | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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22 | 4f917833 | Sofia Papagiannaki | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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23 | 4f917833 | Sofia Papagiannaki | # USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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24 | 4f917833 | Sofia Papagiannaki | # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | 4f917833 | Sofia Papagiannaki | # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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26 | 4f917833 | Sofia Papagiannaki | # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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27 | 4f917833 | Sofia Papagiannaki | # POSSIBILITY OF SUCH DAMAGE.
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28 | 4f917833 | Sofia Papagiannaki | #
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29 | 4f917833 | Sofia Papagiannaki | # The views and conclusions contained in the software and
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30 | 4f917833 | Sofia Papagiannaki | # documentation are those of the authors and should not be
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31 | 4f917833 | Sofia Papagiannaki | # interpreted as representing official policies, either expressed
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32 | 4f917833 | Sofia Papagiannaki | # or implied, of GRNET S.A.
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33 | 4f917833 | Sofia Papagiannaki | |
34 | 4f917833 | Sofia Papagiannaki | from sqlalchemy.sql import select, literal |
35 | 4f1bc0a6 | Sofia Papagiannaki | from sqlalchemy.sql.expression import join, union |
36 | 4f917833 | Sofia Papagiannaki | |
37 | 4f917833 | Sofia Papagiannaki | from xfeatures import XFeatures |
38 | 4f917833 | Sofia Papagiannaki | from groups import Groups |
39 | 4f917833 | Sofia Papagiannaki | from public import Public |
40 | 4f917833 | Sofia Papagiannaki | |
41 | 4f917833 | Sofia Papagiannaki | |
42 | 4f917833 | Sofia Papagiannaki | READ = 0
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43 | 4f917833 | Sofia Papagiannaki | WRITE = 1
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44 | 4f917833 | Sofia Papagiannaki | |
45 | 4f917833 | Sofia Papagiannaki | |
46 | 4f917833 | Sofia Papagiannaki | class Permissions(XFeatures, Groups, Public): |
47 | 4f917833 | Sofia Papagiannaki | |
48 | 4f917833 | Sofia Papagiannaki | def __init__(self, **params): |
49 | 4f917833 | Sofia Papagiannaki | XFeatures.__init__(self, **params)
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50 | 4f917833 | Sofia Papagiannaki | Groups.__init__(self, **params)
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51 | 4f917833 | Sofia Papagiannaki | Public.__init__(self, **params)
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52 | 4f917833 | Sofia Papagiannaki | |
53 | 4f917833 | Sofia Papagiannaki | def access_grant(self, path, access, members=()): |
54 | 4f917833 | Sofia Papagiannaki | """Grant members with access to path.
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55 | 4f917833 | Sofia Papagiannaki | Members can also be '*' (all),
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56 | 4f917833 | Sofia Papagiannaki | or some group specified as 'owner:group'."""
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57 | 4f917833 | Sofia Papagiannaki | |
58 | 4f917833 | Sofia Papagiannaki | if not members: |
59 | 4f917833 | Sofia Papagiannaki | return
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60 | 4f917833 | Sofia Papagiannaki | feature = self.xfeature_create(path)
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61 | 4f917833 | Sofia Papagiannaki | self.feature_setmany(feature, access, members)
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62 | 4f917833 | Sofia Papagiannaki | |
63 | 4f917833 | Sofia Papagiannaki | def access_set(self, path, permissions): |
64 | 4f917833 | Sofia Papagiannaki | """Set permissions for path. The permissions dict
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65 | 4f917833 | Sofia Papagiannaki | maps 'read', 'write' keys to member lists."""
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66 | 4f917833 | Sofia Papagiannaki | |
67 | cf341da4 | Antony Chazapis | r = permissions.get('read', [])
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68 | cf341da4 | Antony Chazapis | w = permissions.get('write', [])
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69 | cf341da4 | Antony Chazapis | if not r and not w: |
70 | cf341da4 | Antony Chazapis | self.xfeature_destroy(path)
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71 | cf341da4 | Antony Chazapis | return
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72 | cf341da4 | Antony Chazapis | feature = self.xfeature_create(path)
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73 | cf341da4 | Antony Chazapis | if r:
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74 | cf341da4 | Antony Chazapis | self.feature_clear(feature, READ)
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75 | cf341da4 | Antony Chazapis | self.feature_setmany(feature, READ, r)
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76 | cf341da4 | Antony Chazapis | if w:
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77 | cf341da4 | Antony Chazapis | self.feature_clear(feature, WRITE)
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78 | cf341da4 | Antony Chazapis | self.feature_setmany(feature, WRITE, w)
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79 | cf341da4 | Antony Chazapis | |
80 | cf341da4 | Antony Chazapis | def access_get(self, path): |
81 | cf341da4 | Antony Chazapis | """Get permissions for path."""
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82 | cf341da4 | Antony Chazapis | |
83 | cf341da4 | Antony Chazapis | feature = self.xfeature_get(path)
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84 | cf341da4 | Antony Chazapis | if not feature: |
85 | cf341da4 | Antony Chazapis | return {}
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86 | cf341da4 | Antony Chazapis | permissions = self.feature_dict(feature)
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87 | cf341da4 | Antony Chazapis | if READ in permissions: |
88 | cf341da4 | Antony Chazapis | permissions['read'] = permissions[READ]
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89 | cf341da4 | Antony Chazapis | del(permissions[READ])
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90 | cf341da4 | Antony Chazapis | if WRITE in permissions: |
91 | cf341da4 | Antony Chazapis | permissions['write'] = permissions[WRITE]
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92 | cf341da4 | Antony Chazapis | del(permissions[WRITE])
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93 | cf341da4 | Antony Chazapis | return permissions
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94 | 4f917833 | Sofia Papagiannaki | |
95 | a74ba506 | Sofia Papagiannaki | def access_members(self, path): |
96 | a74ba506 | Sofia Papagiannaki | feature = self.xfeature_get(path)
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97 | a74ba506 | Sofia Papagiannaki | if not feature: |
98 | a74ba506 | Sofia Papagiannaki | return []
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99 | a74ba506 | Sofia Papagiannaki | permissions = self.feature_dict(feature)
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100 | a74ba506 | Sofia Papagiannaki | members = set()
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101 | a74ba506 | Sofia Papagiannaki | members.update(permissions.get(READ, [])) |
102 | a74ba506 | Sofia Papagiannaki | members.update(permissions.get(WRITE, [])) |
103 | a74ba506 | Sofia Papagiannaki | for m in set(members): |
104 | a74ba506 | Sofia Papagiannaki | parts = m.split(':', 1) |
105 | a74ba506 | Sofia Papagiannaki | if len(parts) != 2: |
106 | a74ba506 | Sofia Papagiannaki | continue
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107 | a74ba506 | Sofia Papagiannaki | user, group = parts |
108 | a74ba506 | Sofia Papagiannaki | members.remove(m) |
109 | a74ba506 | Sofia Papagiannaki | members.update(self.group_members(user, group))
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110 | a74ba506 | Sofia Papagiannaki | return list(members) |
111 | a74ba506 | Sofia Papagiannaki | |
112 | 4f917833 | Sofia Papagiannaki | def access_clear(self, path): |
113 | 4f917833 | Sofia Papagiannaki | """Revoke access to path (both permissions and public)."""
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114 | 4f917833 | Sofia Papagiannaki | |
115 | 4f917833 | Sofia Papagiannaki | self.xfeature_destroy(path)
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116 | 4f917833 | Sofia Papagiannaki | self.public_unset(path)
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117 | 4f917833 | Sofia Papagiannaki | |
118 | 4f917833 | Sofia Papagiannaki | def access_check(self, path, access, member): |
119 | 4f917833 | Sofia Papagiannaki | """Return true if the member has this access to the path."""
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120 | 4f917833 | Sofia Papagiannaki | |
121 | cf341da4 | Antony Chazapis | feature = self.xfeature_get(path)
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122 | cf341da4 | Antony Chazapis | if not feature: |
123 | 4f917833 | Sofia Papagiannaki | return False |
124 | 4f917833 | Sofia Papagiannaki | members = self.feature_get(feature, access)
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125 | 4f917833 | Sofia Papagiannaki | if member in members or '*' in members: |
126 | 4f917833 | Sofia Papagiannaki | return True |
127 | 4f917833 | Sofia Papagiannaki | for owner, group in self.group_parents(member): |
128 | 4f917833 | Sofia Papagiannaki | if owner + ':' + group in members: |
129 | 4f917833 | Sofia Papagiannaki | return True |
130 | 4f917833 | Sofia Papagiannaki | return False |
131 | 4f917833 | Sofia Papagiannaki | |
132 | 4f917833 | Sofia Papagiannaki | def access_inherit(self, path): |
133 | cf341da4 | Antony Chazapis | """Return the paths influencing the access for path."""
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134 | 4f917833 | Sofia Papagiannaki | |
135 | d83c93c9 | Antony Chazapis | # r = self.xfeature_inherit(path)
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136 | d83c93c9 | Antony Chazapis | # if not r:
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137 | d83c93c9 | Antony Chazapis | # return []
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138 | d83c93c9 | Antony Chazapis | # # Compute valid.
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139 | d83c93c9 | Antony Chazapis | # return [x[0] for x in r if x[0] in valid]
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140 | 4f917833 | Sofia Papagiannaki | |
141 | cf341da4 | Antony Chazapis | # Only keep path components.
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142 | cf341da4 | Antony Chazapis | parts = path.rstrip('/').split('/') |
143 | cf341da4 | Antony Chazapis | valid = [] |
144 | cf341da4 | Antony Chazapis | for i in range(1, len(parts)): |
145 | cf341da4 | Antony Chazapis | subp = '/'.join(parts[:i + 1]) |
146 | cf341da4 | Antony Chazapis | valid.append(subp) |
147 | d83c93c9 | Antony Chazapis | if subp != path:
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148 | d83c93c9 | Antony Chazapis | valid.append(subp + '/')
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149 | d83c93c9 | Antony Chazapis | return [x for x in valid if self.xfeature_get(x)] |
150 | 4f917833 | Sofia Papagiannaki | |
151 | 4f917833 | Sofia Papagiannaki | def access_list_paths(self, member, prefix=None): |
152 | 4f917833 | Sofia Papagiannaki | """Return the list of paths granted to member."""
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153 | 4f917833 | Sofia Papagiannaki | |
154 | 4f917833 | Sofia Papagiannaki | xfeatures_xfeaturevals = self.xfeatures.join(self.xfeaturevals) |
155 | 4f917833 | Sofia Papagiannaki | |
156 | 4f917833 | Sofia Papagiannaki | selectable = (self.groups.c.owner + ':' + self.groups.c.name) |
157 | 4f917833 | Sofia Papagiannaki | member_groups = select([selectable.label('value')],
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158 | 4f917833 | Sofia Papagiannaki | self.groups.c.member == member)
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159 | 4f917833 | Sofia Papagiannaki | |
160 | 4f917833 | Sofia Papagiannaki | members = select([literal(member).label('value')])
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161 | f992aa60 | Sofia Papagiannaki | any = select([literal('*').label('value')]) |
162 | 4f917833 | Sofia Papagiannaki | |
163 | fe232f24 | Sofia Papagiannaki | u = union(member_groups, members, any).alias()
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164 | 4f1bc0a6 | Sofia Papagiannaki | inner_join = join(xfeatures_xfeaturevals, u, |
165 | fe232f24 | Sofia Papagiannaki | self.xfeaturevals.c.value == u.c.value)
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166 | 4f917833 | Sofia Papagiannaki | s = select([self.xfeatures.c.path], from_obj=[inner_join]).distinct()
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167 | 4f917833 | Sofia Papagiannaki | if prefix:
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168 | 7759260d | Antony Chazapis | s = s.where(self.xfeatures.c.path.like(self.escape_like(prefix) + '%', escape='\\')) |
169 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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170 | 4f917833 | Sofia Papagiannaki | l = [row[0] for row in r.fetchall()] |
171 | 4f917833 | Sofia Papagiannaki | r.close() |
172 | 4f917833 | Sofia Papagiannaki | return l
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173 | 4f917833 | Sofia Papagiannaki | |
174 | 4f917833 | Sofia Papagiannaki | def access_list_shared(self, prefix=''): |
175 | 4f917833 | Sofia Papagiannaki | """Return the list of shared paths."""
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176 | 4f917833 | Sofia Papagiannaki | |
177 | 4f917833 | Sofia Papagiannaki | s = select([self.xfeatures.c.path],
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178 | 7759260d | Antony Chazapis | self.xfeatures.c.path.like(self.escape_like(prefix) + '%', escape='\\')).order_by(self.xfeatures.c.path.asc()) |
179 | 4f917833 | Sofia Papagiannaki | r = self.conn.execute(s)
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180 | 4f917833 | Sofia Papagiannaki | l = [row[0] for row in r.fetchall()] |
181 | 4f917833 | Sofia Papagiannaki | r.close() |
182 | 937dc831 | Antony Chazapis | return l |