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89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
'''BridgeTransport implements transport TREZOR Bridge (aka trezord).'''
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import json
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import requests
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from . import protobuf_json
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from . import messages_pb2 as proto
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from .transport import TransportV1
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TREZORD_HOST = 'https://localback.net:21324'
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CONFIG_URL = 'https://wallet.trezor.io/data/config_signed.bin'
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def get_error(resp):
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return ' (error=%d str=%s)' % (resp.status_code, resp.json()['error'])
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class BridgeTransport(TransportV1):
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def __init__(self, device, *args, **kwargs):
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self.configure()
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self.path = device['path']
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self.session = None
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self.response = None
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self.conn = requests.Session()
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super(BridgeTransport, self).__init__(device, *args, **kwargs)
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@staticmethod
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def configure():
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r = requests.get(CONFIG_URL, verify=False)
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if r.status_code != 200:
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raise Exception('Could not fetch config from %s' % CONFIG_URL)
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config = r.text
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r = requests.post(TREZORD_HOST + '/configure', data=config)
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if r.status_code != 200:
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raise Exception('trezord: Could not configure' + get_error(r))
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@classmethod
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def enumerate(cls):
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"""
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Return a list of available TREZOR devices.
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"""
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cls.configure()
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r = requests.get(TREZORD_HOST + '/enumerate')
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if r.status_code != 200:
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raise Exception('trezord: Could not enumerate devices' + get_error(r))
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enum = r.json()
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return enum
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def _open(self):
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r = self.conn.post(TREZORD_HOST + '/acquire/%s' % self.path)
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if r.status_code != 200:
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raise Exception('trezord: Could not acquire session' + get_error(r))
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resp = r.json()
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self.session = resp['session']
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def _close(self):
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r = self.conn.post(TREZORD_HOST + '/release/%s' % self.session)
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if r.status_code != 200:
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raise Exception('trezord: Could not release session' + get_error(r))
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else:
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self.session = None
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def _ready_to_read(self):
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return self.response != None
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def write(self, protobuf_msg):
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# Override main 'write' method, HTTP transport cannot be
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# splitted to chunks
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cls = protobuf_msg.__class__.__name__
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msg = protobuf_json.pb2json(protobuf_msg)
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payload = '{"type": "%s", "message": %s}' % (cls, json.dumps(msg))
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r = self.conn.post(TREZORD_HOST + '/call/%s' % self.session, data=payload)
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if r.status_code != 200:
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raise Exception('trezord: Could not write message' + get_error(r))
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else:
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self.response = r.json()
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def _read(self):
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if self.response is None:
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raise Exception('No response stored')
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cls = getattr(proto, self.response['type'])
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inst = cls()
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pb = protobuf_json.json2pb(inst, self.response['message'])
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return (0, 'protobuf', pb)
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