Feat/add webrtc transport

libp2p/transport/webrtc/__init__.py

@@ -0,0 +1,169 @@
+"""
+WebRTC Transport Module for py-libp2p.
+
+Provides both private-to-private and private-to-public WebRTC transport
+implementations.
+"""
+
+import sys
+from .private_to_private.transport import WebRTCTransport
+from .private_to_public.transport import WebRTCDirectTransport
+from .constants import (
+    DEFAULT_ICE_SERVERS,
+    SIGNALING_PROTOCOL,
+    MUXER_PROTOCOL,
+    WebRTCError,
+    SDPHandshakeError,
+    ConnectionStateError,
+    CertificateError,
+    STUNError,
+    CODEC_WEBRTC,
+    CODEC_WEBRTC_DIRECT,
+    CODEC_CERTHASH,
+    PROTOCOL_WEBRTC,
+    PROTOCOL_WEBRTC_DIRECT,
+    PROTOCOL_CERTHASH,
+)
+from typing import Dict, Any, Protocol as TypingProtocol
+from multiaddr import protocols
+from multiaddr.protocols import Protocol
+from multiaddr import codecs
+
+
+class WebRTCCodec:
+    """Codec for WebRTC protocol (empty protocol with no value)."""
+    SIZE = 0
+    IS_PATH = False
+
+    @staticmethod
+    def to_bytes(proto: Any, s: str) -> bytes:
+        return b""
+
+    @staticmethod
+    def to_string(proto: Any, b: bytes) -> str:
+        return ""
+
+
+class WebRTCDirectCodec:
+    """Codec for WebRTC-Direct protocol (empty protocol with no value)."""
+    SIZE = 0
+    IS_PATH = False
+
+    @staticmethod
+    def to_bytes(proto: Any, s: str) -> bytes:
+        return b""
+
+    @staticmethod
+    def to_string(proto: Any, b: bytes) -> str:
+        return ""
+
+
+class CerthashCodec:
+    """Codec for certificate hash protocol (handles certificate hash encoding/decoding)."""
+    SIZE = -1  # Variable size protocol
+    LENGTH_PREFIXED_VAR_SIZE = -1
+    IS_PATH = False
+
+    @staticmethod
+    def to_bytes(proto: Any, s: str) -> bytes:
+        if not s:
+            return b""
+        # Remove multibase prefix if present
+        if s.startswith('uEi'):
+            s = s[3:]
+        elif s.startswith('u'):
+            s = s[1:]
+        # Decode base64url encoded hash
+        try:
+            import base64
+            # Ensure s is encoded as bytes for base64 decoding
+            s_bytes = s.encode('ascii') if isinstance(s, str) else s
+            padding = 4 - (len(s_bytes) % 4)
+            if padding != 4:
+                s_bytes += b'=' * padding
+            return base64.urlsafe_b64decode(s_bytes)
+        except Exception:
+            return s.encode('utf-8')
+
+    @staticmethod
+    def to_string(proto: Any, b: bytes) -> str:
+        if not b:
+            return ""
+        import base64
+        b64_hash = base64.urlsafe_b64encode(b).decode().rstrip('=')
+        return f"uEi{b64_hash}"
+
+
+# Register WebRTC protocols with multiaddr
+try:
+
+    # Create codec instances
+    webrtc_codec = WebRTCCodec()
+    webrtc_direct_codec = WebRTCDirectCodec()
+    certhash_codec = CerthashCodec()
+
+    # Register codec modules for multiaddr
+    sys.modules['multiaddr.codecs.webrtc'] = webrtc_codec  # type: ignore
+    sys.modules['multiaddr.codecs.webrtc_direct'] = webrtc_direct_codec  # type: ignore
+    sys.modules['multiaddr.codecs.certhash'] = certhash_codec  # type: ignore
+
+    setattr(codecs, 'webrtc', webrtc_codec)
+    setattr(codecs, 'webrtc_direct', webrtc_direct_codec)
+    setattr(codecs, 'certhash', certhash_codec)
+
+    # Create Protocol objects with string codec names
+    webrtc_protocol = Protocol(
+        code=CODEC_WEBRTC,
+        name=PROTOCOL_WEBRTC,
+        codec="webrtc"
+    )
+
+    webrtc_direct_protocol = Protocol(
+        code=CODEC_WEBRTC_DIRECT,
+        name=PROTOCOL_WEBRTC_DIRECT,
+        codec="webrtc_direct"
+    )
+
+    certhash_protocol = Protocol(
+        code=CODEC_CERTHASH,
+        name=PROTOCOL_CERTHASH,
+        codec="certhash"
+    )
+
+    # Register protocols using the add_protocol function
+    protocols.add_protocol(webrtc_protocol)
+    protocols.add_protocol(webrtc_direct_protocol)
+    protocols.add_protocol(certhash_protocol)
+
+    print("✅ WebRTC protocols registered with multiaddr")
+
+except ImportError as e:
+    print(f"⚠️ Failed to register WebRTC protocols: {e}")
+except Exception as e:
+    print(f"⚠️ Error registering WebRTC protocols: {e}")
+
+__all__ = [
+    "WebRTCTransport",
+    "WebRTCDirectTransport",
+    "DEFAULT_ICE_SERVERS",
+    "SIGNALING_PROTOCOL",
+    "MUXER_PROTOCOL",
+    "WebRTCError",
+    "SDPHandshakeError",
+    "ConnectionStateError",
+    "CertificateError",
+    "STUNError",
+    "CODEC_WEBRTC",
+    "CODEC_WEBRTC_DIRECT",
+    "CODEC_CERTHASH",
+]
+
+
+def webrtc(config: dict[str, Any] | None = None) -> WebRTCTransport:
+    """Create a WebRTC transport instance (private-to-private)."""
+    return WebRTCTransport(config)
+
+
+def webrtc_direct() -> WebRTCDirectTransport:
+    """Create a WebRTC-Direct transport instance (private-to-public)."""
+    return WebRTCDirectTransport()