--- a/sat/core/constants.py	Wed Jun 27 07:51:29 2018 +0200
+++ b/sat/core/constants.py	Wed Jun 27 20:14:46 2018 +0200
@@ -28,23 +28,24 @@
 class Const(object):
 
     ## Application ##
-    APP_NAME = u'Salut à Toi'
-    APP_NAME_SHORT = u'SàT'
-    APP_NAME_FILE = u'sat'
-    APP_NAME_FULL = u'{name_short} ({name})'.format(name_short=APP_NAME_SHORT,
-                                                    name=APP_NAME)
-    APP_VERSION = sat.__version__  # Please add 'D' at the end of version in sat/VERSION for dev versions
-    APP_RELEASE_NAME = u'La Commune'
-    APP_URL = u'https://salut-a-toi.org'
-
+    APP_NAME = u"Salut à Toi"
+    APP_NAME_SHORT = u"SàT"
+    APP_NAME_FILE = u"sat"
+    APP_NAME_FULL = u"{name_short} ({name})".format(
+        name_short=APP_NAME_SHORT, name=APP_NAME
+    )
+    APP_VERSION = (
+        sat.__version__
+    )  # Please add 'D' at the end of version in sat/VERSION for dev versions
+    APP_RELEASE_NAME = u"La Commune"
+    APP_URL = u"https://salut-a-toi.org"
 
     ## Runtime ##
     PLUGIN_EXT = "py"
-    HISTORY_SKIP = u'skip'
+    HISTORY_SKIP = u"skip"
 
     ## Main config ##
-    DEFAULT_BRIDGE = 'dbus'
-
+    DEFAULT_BRIDGE = "dbus"
 
     ## Protocol ##
     XMPP_C2S_PORT = 5222
@@ -53,9 +54,8 @@
     # default port used on Prosody, may differ on other servers
     XMPP_COMPONENT_PORT = 5347
 
-
     ## Parameters ##
-    NO_SECURITY_LIMIT = -1  # FIXME: to rename
+    NO_SECURITY_LIMIT = -1  #  FIXME: to rename
     SECURITY_LIMIT_MAX = 0
     INDIVIDUAL = "individual"
     GENERAL = "general"
@@ -67,9 +67,9 @@
     FORCE_SERVER_PARAM = "Force server"
     FORCE_PORT_PARAM = "Force port"
     # Parameters related to encryption
-    PROFILE_PASS_PATH = ('General', 'Password')
-    MEMORY_CRYPTO_NAMESPACE = 'crypto'  # for the private persistent binary dict
-    MEMORY_CRYPTO_KEY = 'personal_key'
+    PROFILE_PASS_PATH = ("General", "Password")
+    MEMORY_CRYPTO_NAMESPACE = "crypto"  # for the private persistent binary dict
+    MEMORY_CRYPTO_KEY = "personal_key"
     # Parameters for static blog pages
     # FIXME: blog constants should not be in core constants
     STATIC_BLOG_KEY = "Blog page"
@@ -78,7 +78,6 @@
     STATIC_BLOG_PARAM_KEYWORDS = "Keywords"
     STATIC_BLOG_PARAM_DESCRIPTION = "Description"
 
-
     ## Menus ##
     MENU_GLOBAL = "GLOBAL"
     MENU_ROOM = "ROOM"
@@ -88,62 +87,64 @@
     MENU_ROSTER_GROUP_CONTEXT = "MENU_ROSTER_GROUP_CONTEXT"
     MENU_ROOM_OCCUPANT_CONTEXT = "MENU_ROOM_OCCUPANT_CONTEXT"
 
-
     ## Profile and entities ##
-    PROF_KEY_NONE = '@NONE@'
-    PROF_KEY_DEFAULT = '@DEFAULT@'
-    PROF_KEY_ALL = '@ALL@'
-    ENTITY_ALL = '@ALL@'
-    ENTITY_ALL_RESOURCES = '@ALL_RESOURCES@'
-    ENTITY_MAIN_RESOURCE = '@MAIN_RESOURCE@'
-    ENTITY_CAP_HASH = 'CAP_HASH'
-    ENTITY_TYPE = 'TYPE'
-
+    PROF_KEY_NONE = "@NONE@"
+    PROF_KEY_DEFAULT = "@DEFAULT@"
+    PROF_KEY_ALL = "@ALL@"
+    ENTITY_ALL = "@ALL@"
+    ENTITY_ALL_RESOURCES = "@ALL_RESOURCES@"
+    ENTITY_MAIN_RESOURCE = "@MAIN_RESOURCE@"
+    ENTITY_CAP_HASH = "CAP_HASH"
+    ENTITY_TYPE = "TYPE"
 
     ## Roster jids selection ##
-    PUBLIC = 'PUBLIC'
-    ALL = 'ALL' # ALL means all known contacts, while PUBLIC means everybody, known or not
-    GROUP = 'GROUP'
-    JID = 'JID'
-
+    PUBLIC = "PUBLIC"
+    ALL = (
+        "ALL"
+    )  # ALL means all known contacts, while PUBLIC means everybody, known or not
+    GROUP = "GROUP"
+    JID = "JID"
 
     ## Messages ##
-    MESS_TYPE_INFO = 'info'
-    MESS_TYPE_CHAT = 'chat'
-    MESS_TYPE_ERROR = 'error'
-    MESS_TYPE_GROUPCHAT = 'groupchat'
-    MESS_TYPE_HEADLINE = 'headline'
-    MESS_TYPE_NORMAL = 'normal'
-    MESS_TYPE_AUTO = 'auto'  # magic value to let the backend guess the type
-    MESS_TYPE_STANDARD = (MESS_TYPE_CHAT, MESS_TYPE_ERROR, MESS_TYPE_GROUPCHAT, MESS_TYPE_HEADLINE, MESS_TYPE_NORMAL)
+    MESS_TYPE_INFO = "info"
+    MESS_TYPE_CHAT = "chat"
+    MESS_TYPE_ERROR = "error"
+    MESS_TYPE_GROUPCHAT = "groupchat"
+    MESS_TYPE_HEADLINE = "headline"
+    MESS_TYPE_NORMAL = "normal"
+    MESS_TYPE_AUTO = "auto"  # magic value to let the backend guess the type
+    MESS_TYPE_STANDARD = (
+        MESS_TYPE_CHAT,
+        MESS_TYPE_ERROR,
+        MESS_TYPE_GROUPCHAT,
+        MESS_TYPE_HEADLINE,
+        MESS_TYPE_NORMAL,
+    )
     MESS_TYPE_ALL = MESS_TYPE_STANDARD + (MESS_TYPE_INFO, MESS_TYPE_AUTO)
 
     MESS_EXTRA_INFO = "info_type"
 
-
     ## Chat ##
-    CHAT_ONE2ONE = 'one2one'
-    CHAT_GROUP = 'group'
-
+    CHAT_ONE2ONE = "one2one"
+    CHAT_GROUP = "group"
 
     ## Presence ##
-    PRESENCE_UNAVAILABLE = 'unavailable'
-    PRESENCE_SHOW_AWAY = 'away'
-    PRESENCE_SHOW_CHAT = 'chat'
-    PRESENCE_SHOW_DND = 'dnd'
-    PRESENCE_SHOW_XA = 'xa'
-    PRESENCE_SHOW = 'show'
-    PRESENCE_STATUSES = 'statuses'
-    PRESENCE_STATUSES_DEFAULT = 'default'
-    PRESENCE_PRIORITY = 'priority'
-
+    PRESENCE_UNAVAILABLE = "unavailable"
+    PRESENCE_SHOW_AWAY = "away"
+    PRESENCE_SHOW_CHAT = "chat"
+    PRESENCE_SHOW_DND = "dnd"
+    PRESENCE_SHOW_XA = "xa"
+    PRESENCE_SHOW = "show"
+    PRESENCE_STATUSES = "statuses"
+    PRESENCE_STATUSES_DEFAULT = "default"
+    PRESENCE_PRIORITY = "priority"
 
     ## Common namespaces ##
-    NS_XML = 'http://www.w3.org/XML/1998/namespace'
-    NS_CLIENT = 'jabber:client'
-    NS_FORWARD = 'urn:xmpp:forward:0'
-    NS_DELAY = 'urn:xmpp:delay'
-    NS_XHTML = 'http://www.w3.org/1999/xhtml'
+    NS_XML = "http://www.w3.org/XML/1998/namespace"
+    NS_CLIENT = "jabber:client"
+    NS_FORWARD = "urn:xmpp:forward:0"
+    NS_DELAY = "urn:xmpp:delay"
+    NS_XHTML = "http://www.w3.org/1999/xhtml"
 
     ## Common XPath ##
 
@@ -153,23 +154,24 @@
     ## Directories ##
 
     # directory for components specific data
-    COMPONENTS_DIR = u'components'
-    CACHE_DIR = u'cache'
+    COMPONENTS_DIR = u"components"
+    CACHE_DIR = u"cache"
     # files in file dir are stored for long term
     # files dir is global, i.e. for all profiles
-    FILES_DIR = u'files'
+    FILES_DIR = u"files"
     # FILES_LINKS_DIR is a directory where files owned by a specific profile
     # are linked to the global files directory. This way the directory can be
-    # shared per profiles while keeping global directory where identical files
+    #  shared per profiles while keeping global directory where identical files
     # shared between different profiles are not duplicated.
-    FILES_LINKS_DIR = u'files_links'
+    FILES_LINKS_DIR = u"files_links"
     # FILES_TMP_DIR is where profile's partially transfered files are put.
     # Once transfer is completed, they are moved to FILES_DIR
-    FILES_TMP_DIR = u'files_tmp'
-
+    FILES_TMP_DIR = u"files_tmp"
 
     ## Configuration ##
-    if BaseDirectory:  # skipped when xdg module is not available (should not happen in backend)
+    if (
+        BaseDirectory
+    ):  # skipped when xdg module is not available (should not happen in backend)
         if "org.goffi.cagou.cagou" in BaseDirectory.__file__:
             # FIXME: hack to make config read from the right location on Android
             # TODO: fix it in a more proper way
@@ -177,56 +179,71 @@
             # we need to use Android API to get downloads directory
             import os.path
             from jnius import autoclass
+
             Environment = autoclass("android.os.Environment")
 
             BaseDirectory = None
             DEFAULT_CONFIG = {
-                'local_dir': '/data/data/org.goffi.cagou.cagou/app',
-                'media_dir': '/data/data/org.goffi.cagou.cagou/files/app/media',
+                "local_dir": "/data/data/org.goffi.cagou.cagou/app",
+                "media_dir": "/data/data/org.goffi.cagou.cagou/files/app/media",
                 # FIXME: temporary location for downloads, need to call API properly
-                'downloads_dir': os.path.join(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath(), APP_NAME_FILE),
-                'pid_dir': '%(local_dir)s',
-                'log_dir': '%(local_dir)s',
+                "downloads_dir": os.path.join(
+                    Environment.getExternalStoragePublicDirectory(
+                        Environment.DIRECTORY_DOWNLOADS
+                    ).getAbsolutePath(),
+                    APP_NAME_FILE,
+                ),
+                "pid_dir": "%(local_dir)s",
+                "log_dir": "%(local_dir)s",
             }
-            CONFIG_FILES = ['/data/data/org.goffi.cagou.cagou/files/app/android/' + APP_NAME_FILE + '.conf']
+            CONFIG_FILES = [
+                "/data/data/org.goffi.cagou.cagou/files/app/android/"
+                + APP_NAME_FILE
+                + ".conf"
+            ]
         else:
 
             ## Configuration ##
             DEFAULT_CONFIG = {
-                'media_dir': '/usr/share/' + APP_NAME_FILE + '/media',
-                'local_dir': BaseDirectory.save_data_path(APP_NAME_FILE),
-                'downloads_dir': '~/Downloads/' + APP_NAME_FILE,
-                'pid_dir': '%(local_dir)s',
-                'log_dir': '%(local_dir)s',
+                "media_dir": "/usr/share/" + APP_NAME_FILE + "/media",
+                "local_dir": BaseDirectory.save_data_path(APP_NAME_FILE),
+                "downloads_dir": "~/Downloads/" + APP_NAME_FILE,
+                "pid_dir": "%(local_dir)s",
+                "log_dir": "%(local_dir)s",
             }
 
             # List of the configuration filenames sorted by ascending priority
-            CONFIG_FILES = [realpath(expanduser(path) + APP_NAME_FILE + '.conf') for path in
-                            ['/etc/', '~/', '~/.', '', '.'] +
-                            ['%s/' % path for path in list(BaseDirectory.load_config_paths(APP_NAME_FILE))]
-                           ]
+            CONFIG_FILES = [
+                realpath(expanduser(path) + APP_NAME_FILE + ".conf")
+                for path in ["/etc/", "~/", "~/.", "", "."]
+                + [
+                    "%s/" % path
+                    for path in list(BaseDirectory.load_config_paths(APP_NAME_FILE))
+                ]
+            ]
 
     ## Templates ##
-    TEMPLATE_THEME_DEFAULT = u'default'
-    TEMPLATE_STATIC_DIR = u'static'
-
+    TEMPLATE_THEME_DEFAULT = u"default"
+    TEMPLATE_STATIC_DIR = u"static"
 
     ## Plugins ##
 
     # PLUGIN_INFO keys
     # XXX: we use PI instead of PLUG_INFO which would normally be used
     #      to make the header more readable
-    PI_NAME = u'name'
-    PI_IMPORT_NAME = u'import_name'
-    PI_MAIN = u'main'
-    PI_HANDLER = u'handler'
-    PI_TYPE = u'type' # FIXME: should be types, and should handle single unicode type or tuple of types (e.g. "blog" and "import")
-    PI_MODES = u'modes'
-    PI_PROTOCOLS = u'protocols'
-    PI_DEPENDENCIES = u'dependencies'
-    PI_RECOMMENDATIONS = u'recommendations'
-    PI_DESCRIPTION = u'description'
-    PI_USAGE = u'usage'
+    PI_NAME = u"name"
+    PI_IMPORT_NAME = u"import_name"
+    PI_MAIN = u"main"
+    PI_HANDLER = u"handler"
+    PI_TYPE = (
+        u"type"
+    )  #  FIXME: should be types, and should handle single unicode type or tuple of types (e.g. "blog" and "import")
+    PI_MODES = u"modes"
+    PI_PROTOCOLS = u"protocols"
+    PI_DEPENDENCIES = u"dependencies"
+    PI_RECOMMENDATIONS = u"recommendations"
+    PI_DESCRIPTION = u"description"
+    PI_USAGE = u"usage"
 
     # Types
     PLUG_TYPE_XEP = "XEP"
@@ -245,7 +262,7 @@
     PLUG_MODE_BOTH = (PLUG_MODE_CLIENT, PLUG_MODE_COMPONENT)
 
     # names of widely used plugins
-    TEXT_CMDS = 'TEXT-COMMANDS'
+    TEXT_CMDS = "TEXT-COMMANDS"
 
     # PubSub event categories
     PS_PEP = "PEP"
@@ -253,19 +270,18 @@
 
     # PubSub
     PS_PUBLISH = "publish"
-    PS_RETRACT = "retract" # used for items
-    PS_DELETE = "delete" # used for nodes
+    PS_RETRACT = "retract"  # used for items
+    PS_DELETE = "delete"  # used for nodes
     PS_ITEM = "item"
-    PS_ITEMS = "items" # Can contain publish and retract items
+    PS_ITEMS = "items"  # Can contain publish and retract items
     PS_EVENTS = (PS_ITEMS, PS_DELETE)
 
-
     ## XMLUI ##
-    XMLUI_WINDOW = 'window'
-    XMLUI_POPUP = 'popup'
-    XMLUI_FORM = 'form'
-    XMLUI_PARAM = 'param'
-    XMLUI_DIALOG = 'dialog'
+    XMLUI_WINDOW = "window"
+    XMLUI_POPUP = "popup"
+    XMLUI_FORM = "form"
+    XMLUI_PARAM = "param"
+    XMLUI_DIALOG = "dialog"
     XMLUI_DIALOG_CONFIRM = "confirm"
     XMLUI_DIALOG_MESSAGE = "message"
     XMLUI_DIALOG_NOTE = "note"
@@ -284,108 +300,119 @@
     XMLUI_DATA_BTNS_SET_OKCANCEL = "ok/cancel"
     XMLUI_DATA_BTNS_SET_YESNO = "yes/no"
     XMLUI_DATA_BTNS_SET_DEFAULT = XMLUI_DATA_BTNS_SET_OKCANCEL
-    XMLUI_DATA_FILETYPE = 'filetype'
+    XMLUI_DATA_FILETYPE = "filetype"
     XMLUI_DATA_FILETYPE_FILE = "file"
     XMLUI_DATA_FILETYPE_DIR = "dir"
     XMLUI_DATA_FILETYPE_DEFAULT = XMLUI_DATA_FILETYPE_FILE
 
-
     ## Logging ##
-    LOG_LVL_DEBUG = 'DEBUG'
-    LOG_LVL_INFO = 'INFO'
-    LOG_LVL_WARNING = 'WARNING'
-    LOG_LVL_ERROR = 'ERROR'
-    LOG_LVL_CRITICAL = 'CRITICAL'
-    LOG_LEVELS = (LOG_LVL_DEBUG, LOG_LVL_INFO, LOG_LVL_WARNING, LOG_LVL_ERROR, LOG_LVL_CRITICAL)
-    LOG_BACKEND_STANDARD = 'standard'
-    LOG_BACKEND_TWISTED = 'twisted'
-    LOG_BACKEND_BASIC = 'basic'
-    LOG_BACKEND_CUSTOM = 'custom'
-    LOG_BASE_LOGGER = 'root'
-    LOG_TWISTED_LOGGER = 'twisted'
-    LOG_OPT_SECTION = 'DEFAULT' # section of sat.conf where log options should be
-    LOG_OPT_PREFIX = 'log_'
+    LOG_LVL_DEBUG = "DEBUG"
+    LOG_LVL_INFO = "INFO"
+    LOG_LVL_WARNING = "WARNING"
+    LOG_LVL_ERROR = "ERROR"
+    LOG_LVL_CRITICAL = "CRITICAL"
+    LOG_LEVELS = (
+        LOG_LVL_DEBUG,
+        LOG_LVL_INFO,
+        LOG_LVL_WARNING,
+        LOG_LVL_ERROR,
+        LOG_LVL_CRITICAL,
+    )
+    LOG_BACKEND_STANDARD = "standard"
+    LOG_BACKEND_TWISTED = "twisted"
+    LOG_BACKEND_BASIC = "basic"
+    LOG_BACKEND_CUSTOM = "custom"
+    LOG_BASE_LOGGER = "root"
+    LOG_TWISTED_LOGGER = "twisted"
+    LOG_OPT_SECTION = "DEFAULT"  # section of sat.conf where log options should be
+    LOG_OPT_PREFIX = "log_"
     # (option_name, default_value) tuples
-    LOG_OPT_COLORS = ('colors', 'true') # true for auto colors, force to have colors even if stdout is not a tty, false for no color
-    LOG_OPT_TAINTS_DICT = ('levels_taints_dict', {
-        LOG_LVL_DEBUG: ('cyan',),
-        LOG_LVL_INFO: (),
-        LOG_LVL_WARNING: ('yellow',),
-        LOG_LVL_ERROR: ('red', 'blink', r'/!\ ', 'blink_off'),
-        LOG_LVL_CRITICAL: ('bold', 'red', 'Guru Meditation ', 'normal_weight')
-        })
-    LOG_OPT_LEVEL = ('level', 'info')
-    LOG_OPT_FORMAT = ('fmt', '%(message)s') # similar to logging format.
-    LOG_OPT_LOGGER = ('logger', '') # regex to filter logger name
-    LOG_OPT_OUTPUT_SEP = '//'
-    LOG_OPT_OUTPUT_DEFAULT = 'default'
-    LOG_OPT_OUTPUT_MEMORY = 'memory'
+    LOG_OPT_COLORS = (
+        "colors",
+        "true",
+    )  # true for auto colors, force to have colors even if stdout is not a tty, false for no color
+    LOG_OPT_TAINTS_DICT = (
+        "levels_taints_dict",
+        {
+            LOG_LVL_DEBUG: ("cyan",),
+            LOG_LVL_INFO: (),
+            LOG_LVL_WARNING: ("yellow",),
+            LOG_LVL_ERROR: ("red", "blink", r"/!\ ", "blink_off"),
+            LOG_LVL_CRITICAL: ("bold", "red", "Guru Meditation ", "normal_weight"),
+        },
+    )
+    LOG_OPT_LEVEL = ("level", "info")
+    LOG_OPT_FORMAT = ("fmt", "%(message)s")  # similar to logging format.
+    LOG_OPT_LOGGER = ("logger", "")  # regex to filter logger name
+    LOG_OPT_OUTPUT_SEP = "//"
+    LOG_OPT_OUTPUT_DEFAULT = "default"
+    LOG_OPT_OUTPUT_MEMORY = "memory"
     LOG_OPT_OUTPUT_MEMORY_LIMIT = 50
-    LOG_OPT_OUTPUT_FILE = 'file' # file is implicit if only output
-    LOG_OPT_OUTPUT = ('output', LOG_OPT_OUTPUT_SEP + LOG_OPT_OUTPUT_DEFAULT) # //default = normal output (stderr or a file with twistd), path/to/file for a file (must be the first if used), //memory for memory (options can be put in parenthesis, e.g.: //memory(500) for a 500 lines memory)
-
+    LOG_OPT_OUTPUT_FILE = "file"  # file is implicit if only output
+    LOG_OPT_OUTPUT = (
+        "output",
+        LOG_OPT_OUTPUT_SEP + LOG_OPT_OUTPUT_DEFAULT,
+    )  # //default = normal output (stderr or a file with twistd), path/to/file for a file (must be the first if used), //memory for memory (options can be put in parenthesis, e.g.: //memory(500) for a 500 lines memory)
 
     ## action constants ##
     META_TYPE_FILE = "file"
     META_TYPE_OVERWRITE = "overwrite"
 
-
     ## HARD-CODED ACTIONS IDS (generated with uuid.uuid4) ##
-    AUTHENTICATE_PROFILE_ID = u'b03bbfa8-a4ae-4734-a248-06ce6c7cf562'
-    CHANGE_XMPP_PASSWD_ID = u'878b9387-de2b-413b-950f-e424a147bcd0'
-
+    AUTHENTICATE_PROFILE_ID = u"b03bbfa8-a4ae-4734-a248-06ce6c7cf562"
+    CHANGE_XMPP_PASSWD_ID = u"878b9387-de2b-413b-950f-e424a147bcd0"
 
     ## Text values ##
     BOOL_TRUE = "true"
     BOOL_FALSE = "false"
 
-
     ## Special values used in bridge methods calls ##
     HISTORY_LIMIT_DEFAULT = -1
     HISTORY_LIMIT_NONE = -2
 
-
     ## Progress error special values ##
-    PROGRESS_ERROR_DECLINED = u'declined'  # session has been declined by peer user
-
+    PROGRESS_ERROR_DECLINED = u"declined"  #  session has been declined by peer user
 
     ## Files ##
-    FILE_TYPE_DIRECTORY = 'directory'
-    FILE_TYPE_FILE = 'file'
-
+    FILE_TYPE_DIRECTORY = "directory"
+    FILE_TYPE_FILE = "file"
 
     ## Permissions management ##
-    ACCESS_PERM_READ = u'read'
-    ACCESS_PERM_WRITE = u'write'
+    ACCESS_PERM_READ = u"read"
+    ACCESS_PERM_WRITE = u"write"
     ACCESS_PERMS = {ACCESS_PERM_READ, ACCESS_PERM_WRITE}
-    ACCESS_TYPE_PUBLIC = u'public'
-    ACCESS_TYPE_WHITELIST = u'whitelist'
+    ACCESS_TYPE_PUBLIC = u"public"
+    ACCESS_TYPE_WHITELIST = u"whitelist"
     ACCESS_TYPES = (ACCESS_TYPE_PUBLIC, ACCESS_TYPE_WHITELIST)
 
-
     ## Common data keys ##
-    KEY_THUMBNAILS = u'thumbnails'
-    KEY_PROGRESS_ID = u'progress_id'
+    KEY_THUMBNAILS = u"thumbnails"
+    KEY_PROGRESS_ID = u"progress_id"
 
-
-    #internationalisation
-    DEFAULT_LOCALE = u'en_GB'
-
+    # internationalisation
+    DEFAULT_LOCALE = u"en_GB"
 
     ## Misc ##
     SAVEFILE_DATABASE = APP_NAME_FILE + ".db"
     IQ_SET = '/iq[@type="set"]'
-    ENV_PREFIX = 'SAT_' # Prefix used for environment variables
-    IGNORE = 'ignore'
-    NO_LIMIT = -1 # used in bridge when a integer value is expected
-    DEFAULT_MAX_AGE = 1209600 # default max age of cached files, in seconds
-    HASH_SHA1_EMPTY = 'da39a3ee5e6b4b0d3255bfef95601890afd80709'
+    ENV_PREFIX = "SAT_"  # Prefix used for environment variables
+    IGNORE = "ignore"
+    NO_LIMIT = -1  # used in bridge when a integer value is expected
+    DEFAULT_MAX_AGE = 1209600  # default max age of cached files, in seconds
+    HASH_SHA1_EMPTY = "da39a3ee5e6b4b0d3255bfef95601890afd80709"
 
     @classmethod
     def LOG_OPTIONS(cls):
         """Return options checked for logs"""
         # XXX: we use a classmethod so we can use Const inheritance to change default options
-        return(cls.LOG_OPT_COLORS, cls.LOG_OPT_TAINTS_DICT, cls.LOG_OPT_LEVEL, cls.LOG_OPT_FORMAT, cls.LOG_OPT_LOGGER, cls.LOG_OPT_OUTPUT)
+        return (
+            cls.LOG_OPT_COLORS,
+            cls.LOG_OPT_TAINTS_DICT,
+            cls.LOG_OPT_LEVEL,
+            cls.LOG_OPT_FORMAT,
+            cls.LOG_OPT_LOGGER,
+            cls.LOG_OPT_OUTPUT,
+        )
 
     @classmethod
     def bool(cls, value):