Move simple security to libp2p/security

libp2p/security/simple_security.py

@@ -0,0 +1,61 @@
+import asyncio
+from libp2p.security.secure_transport_interface import ISecureTransport
+from libp2p.security.secure_conn_interface import ISecureConn
+
+class SimpleSecurityTransport(ISecureTransport):
+
+    def __init__(self, key_phrase):
+        self.key_phrase = key_phrase
+
+    async def secure_inbound(self, conn):
+        """
+        Secure the connection, either locally or by communicating with opposing node via conn,
+        for an inbound connection (i.e. we are not the initiator)
+        :return: secure connection object (that implements secure_conn_interface)
+        """
+        await conn.write(self.key_phrase.encode())
+        incoming = (await conn.read()).decode()
+
+        if incoming != self.key_phrase:
+            raise Exception("Key phrase differed between nodes. Expected " + self.key_phrase)
+
+        secure_conn = SimpleSecureConn(conn, self.key_phrase)
+        return secure_conn
+
+    async def secure_outbound(self, conn, peer_id):
+        """
+        Secure the connection, either locally or by communicating with opposing node via conn,
+        for an inbound connection (i.e. we are the initiator)
+        :return: secure connection object (that implements secure_conn_interface)
+        """
+        await conn.write(self.key_phrase.encode())
+        incoming = (await conn.read()).decode()
+
+        # Force context switch, as this security transport is built for testing locally
+        # in a single event loop
+        await asyncio.sleep(0)
+
+        if incoming != self.key_phrase:
+            raise Exception("Key phrase differed between nodes. Expected " + self.key_phrase)
+
+        secure_conn = SimpleSecureConn(conn, self.key_phrase)
+        return secure_conn
+
+class SimpleSecureConn(ISecureConn):
+
+    def __init__(self, conn, key_phrase):
+        self.conn = conn
+        self.details = {}
+        self.details["key_phrase"] = key_phrase
+
+    def get_conn(self):
+        """
+        :return: connection object that has been made secure
+        """
+        return self.conn
+
+    def get_security_details(self):
+        """
+        :return: map containing details about the connections security
+        """
+        return self.details