Removed legacy `backend.scard`.

Closes: #303

docs/source/backends.rst

@@ -15,7 +15,6 @@ Backends
     platypush/backend/music.spotify.rst
     platypush/backend/nodered.rst
     platypush/backend/redis.rst
-    platypush/backend/scard.rst
     platypush/backend/sensor.ir.zeroborg.rst
     platypush/backend/sensor.leap.rst
     platypush/backend/stt.deepspeech.rst

docs/source/platypush/backend/scard.rst

@@ -1,6 +0,0 @@
-``scard``
-===========================
-
-.. automodule:: platypush.backend.scard
-    :members:
-

platypush/backend/scard/__init__.py

@@ -1,87 +0,0 @@
-from platypush.backend import Backend
-from platypush.message.event.scard import SmartCardDetectedEvent, SmartCardRemovedEvent
-
-
-class ScardBackend(Backend):
-    """
-    Generic backend to read smart cards and NFC tags and trigger an event
-    whenever a device is detected.
-
-    Extend this backend to implement more advanced communication with custom
-    smart cards.
-    """
-
-    def __init__(self, atr=None, *args, **kwargs):
-        """
-        :param atr: If set, the backend will trigger events only for card(s)
-            with the specified ATR(s). It can be either an ATR string
-            (space-separated hex octects) or a list of ATR strings.  Default:
-            none (any card will be detected).
-        """
-
-        from smartcard.CardType import AnyCardType, ATRCardType
-
-        super().__init__(*args, **kwargs)
-        self.ATRs = []
-
-        if atr:
-            if isinstance(atr, str):
-                self.ATRs = [atr]
-            elif isinstance(atr, list):
-                self.ATRs = atr
-            else:
-                raise RuntimeError(
-                    f"Unsupported ATR: \"{atr}\" - type: {type(atr)}, "
-                    + "supported types: string, list"
-                )
-
-            self.cardtype = ATRCardType(*[self._to_bytes(atr) for atr in self.ATRs])
-        else:
-            self.cardtype = AnyCardType()
-
-    @staticmethod
-    def _to_bytes(data) -> bytes:
-        if isinstance(data, str):
-            data = data.encode()
-        return data
-
-    def run(self):
-        from smartcard.CardRequest import CardRequest
-        from smartcard.Exceptions import NoCardException, CardConnectionException
-        from smartcard.util import toHexString
-
-        super().run()
-
-        self.logger.info(
-            'Initialized smart card reader backend - ATR filter: {}'.format(self.ATRs)
-        )
-
-        prev_atr = None
-        reader = None
-
-        while not self.should_stop():
-            try:
-                cardrequest = CardRequest(timeout=None, cardType=self.cardtype)
-                cardservice = cardrequest.waitforcard()
-                cardservice.connection.connect()
-
-                reader = cardservice.connection.getReader()
-                atr = toHexString(cardservice.connection.getATR())
-
-                if atr != prev_atr:
-                    self.logger.info(
-                        'Smart card detected on reader {}, ATR: {}'.format(reader, atr)
-                    )
-
-                    self.bus.post(SmartCardDetectedEvent(atr=atr, reader=reader))
-                    prev_atr = atr
-            except Exception as e:
-                if isinstance(e, (NoCardException, CardConnectionException)):
-                    self.bus.post(SmartCardRemovedEvent(atr=prev_atr, reader=reader))
-                else:
-                    self.logger.exception(e)
-
-                prev_atr = None
-
-
-# vim:sw=4:ts=4:et:

platypush/backend/scard/manifest.yaml

@@ -1,17 +0,0 @@
-manifest:
-  events:
-    platypush.message.event.scard.SmartCardDetectedEvent: when a smart card is detected
-    platypush.message.event.scard.SmartCardRemovedEvent: when a smart card is removed
-  install:
-    apk:
-      - py3-pyscard
-    apt:
-      - python3-pyscard
-    dnf:
-      - python-pyscard
-    pacman:
-      - python-pyscard
-    pip:
-      - pyscard
-  package: platypush.backend.scard
-  type: backend