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96 lines
2.8 KiB
Python
96 lines
2.8 KiB
Python
# Copyright 2017 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""Utility functions for modifying an app's settings file using JSON."""
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import json
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import logging
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def UnicodeToStr(data):
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"""Recursively converts any Unicode to Python strings.
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Args:
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data: The data to be converted.
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Return:
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A copy of the given data, but with instances of Unicode converted to Python
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strings.
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"""
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if isinstance(data, dict):
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return {UnicodeToStr(key): UnicodeToStr(value)
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for key, value in data.iteritems()}
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elif isinstance(data, list):
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return [UnicodeToStr(element) for element in data]
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elif isinstance(data, unicode):
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return data.encode('utf-8')
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return data
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def ExtractSettingsFromJson(filepath):
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"""Extracts the settings data from the given JSON file.
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Args:
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filepath: The path to the JSON file to read.
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Return:
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The data read from the JSON file with strings converted to Python strings.
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"""
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# json.load() loads strings as unicode, which causes issues when trying
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# to edit string values in preference files, so convert to Python strings
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with open(filepath) as prefs_file:
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return UnicodeToStr(json.load(prefs_file))
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def ApplySharedPreferenceSetting(shared_pref, setting):
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"""Applies the given app settings to the given device.
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Modifies an installed app's settings by modifying its shared preference
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settings file. Provided settings data must be a settings dictionary,
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which are in the following format:
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{
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"package": "com.example.package",
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"filename": "AppSettingsFile.xml",
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"supports_encrypted_path": true,
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"set": {
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"SomeBoolToSet": true,
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"SomeStringToSet": "StringValue",
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},
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"remove": [
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"list",
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"of",
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"keys",
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"to",
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"remove",
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]
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}
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Example JSON files that can be read with ExtractSettingsFromJson and passed to
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this function are in //chrome/android/shared_preference_files/test/.
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Args:
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shared_pref: The devil SharedPrefs object for the device the settings will
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be applied to.
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setting: A settings dictionary to apply.
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"""
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shared_pref.Load()
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for key in setting.get('remove', []):
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try:
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shared_pref.Remove(key)
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except KeyError:
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logging.warning("Attempted to remove non-existent key %s", key)
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for key, value in setting.get('set', {}).iteritems():
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if isinstance(value, bool):
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shared_pref.SetBoolean(key, value)
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elif isinstance(value, basestring):
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shared_pref.SetString(key, value)
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elif isinstance(value, long) or isinstance(value, int):
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shared_pref.SetLong(key, value)
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elif isinstance(value, list):
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shared_pref.SetStringSet(key, value)
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else:
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raise ValueError("Given invalid value type %s for key %s" % (
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str(type(value)), key))
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shared_pref.Commit()
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