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annotate planemo/lib/python3.7/site-packages/boto/plugin.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Copyright 2010 Google Inc.
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21
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22
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23 """
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24 Implements plugin related api.
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25
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26 To define a new plugin just subclass Plugin, like this.
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27
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28 class AuthPlugin(Plugin):
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29 pass
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30
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31 Then start creating subclasses of your new plugin.
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32
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33 class MyFancyAuth(AuthPlugin):
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34 capability = ['sign', 'vmac']
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35
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36 The actual interface is duck typed.
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37 """
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38
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39 import glob
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40 import imp
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41 import os.path
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42
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43
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44 class Plugin(object):
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45 """Base class for all plugins."""
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46
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47 capability = []
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48
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49 @classmethod
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50 def is_capable(cls, requested_capability):
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51 """Returns true if the requested capability is supported by this plugin
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52 """
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53 for c in requested_capability:
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54 if c not in cls.capability:
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55 return False
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56 return True
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57
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58
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59 def get_plugin(cls, requested_capability=None):
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60 if not requested_capability:
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61 requested_capability = []
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62 result = []
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63 for handler in cls.__subclasses__():
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64 if handler.is_capable(requested_capability):
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65 result.append(handler)
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66 return result
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67
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68
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69 def _import_module(filename):
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70 (path, name) = os.path.split(filename)
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71 (name, ext) = os.path.splitext(name)
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72
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73 (file, filename, data) = imp.find_module(name, [path])
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74 try:
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75 return imp.load_module(name, file, filename, data)
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76 finally:
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77 if file:
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78 file.close()
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79
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80 _plugin_loaded = False
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81
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82
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83 def load_plugins(config):
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84 global _plugin_loaded
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85 if _plugin_loaded:
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86 return
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87 _plugin_loaded = True
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88
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89 if not config.has_option('Plugin', 'plugin_directory'):
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90 return
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91 directory = config.get('Plugin', 'plugin_directory')
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92 for file in glob.glob(os.path.join(directory, '*.py')):
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93 _import_module(file)