cloud_link.py 文件源码

def get_channel(self):
        #first get a token we need to sign in order to prove we are who we say we are
        r = requests.get(str(self.base_link_uri) + "/get_device_token", params={"UUID": self.uuid, })

        token = r.json()["token"]
        # get the private Key
        with open(CloudLinkSettings.PRIVATE_KEY_LOCATION,'r') as key_file:
            private_key = serialization.load_pem_private_key(key_file.read(),
                                                             password=CloudLinkSettings.PRIVATE_KEY_PASSPHRASE,
                                                             backend=default_backend())

        # sign the token with our private key
        signer = private_key.signer(padding.PKCS1v15(), hashes.SHA256())
        signer.update(bytes(token))
        signature = signer.finalize()

        # get the randomly assigned channel for my UUID
        r = requests.get(str(self.base_link_uri) + "/get_device_group",
                         params={"UUID": self.uuid, "signature": b64encode(signature), "format": "PKCS1_v1_5"})
        if r.ok:
            self.channel_uri = r.json()["channel"]
        elif r.status_code == 400:
            raise Exception("UUID or Token not registered with Cloud.")
        elif r.status_code == 403:
            raise Exception("Signature didn't verify correctly. Bad private key or signature.")