WIP

.eslintrc.js

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+module.exports = {
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+    'eslint-plugin-prettier',
+    'autofix',
+    'import',
+    'compat',
+    'prettier',
+    'unused-imports',
+    'react-perf',
+  ],
+  rules: {
+    '@typescript-eslint/explicit-module-boundary-types': 'off',
+    '@typescript-eslint/no-var-requires': 0,
+    '@typescript-eslint/ban-ts-comment': 0,
+    '@typescript-eslint/no-empty-interface': 0,
+    '@typescript-eslint/ban-types': 0,
+    '@typescript-eslint/no-explicit-any': 0,
+    '@typescript-eslint/no-non-null-assertion': 0,
+    'prettier/prettier': 'error',
+    'import/order': 'error',
+    'function-paren-newline': ['error', 'consistent'],
+    'array-callback-return': 0,
+    '@typescript-eslint/no-unused-vars': 1,
+    'function-paren-newline': 0,
+    'unused-imports/no-unused-imports-ts': 2,
+    camelcase: 0,
+    'react-hooks/exhaustive-deps': 1,
+    'no-use-before-define': 'off',
+    '@typescript-eslint/no-use-before-define': ['error'],
+  },
+  extends: [
+    'react-app',
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+    'plugin:import/errors',
+    'plugin:import/warnings',
+    'plugin:import/typescript',
+    'plugin:markdown/recommended',
+  ],
+  overrides: [
+    {
+      files: ['**/workers/*.ts'],
+      rules: {
+        'no-restricted-globals': 'off',
+      },
+    },
+  ],
+};

.gitignore

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+lib-cov
+*.seed
+*.log
+*.csv
+*.dat
+*.out
+*.pid
+*.gz
+*.swp
+
+pids
+logs
+results
+tmp
+
+# Build
+public/css/main.css
+
+# Coverage reports
+coverage
+
+# API keys and secrets
+.env
+
+# Dependency directory
+node_modules
+bower_components
+
+# Editors
+.idea
+*.iml
+.vscode/launch.json
+
+# OS metadata
+.DS_Store
+Thumbs.db
+
+# Ignore built ts files
+dist/**/*
+
+# ignore yarn.lock
+yarn.lock
+package-lock.json
+
+

.prettierrc

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+{
+   "printWidth":180,
+   "tabWidth":2,
+   "useTabs":false,
+   "semi":true,
+   "singleQuote":true,
+   "trailingComma":"es5",
+   "bracketSpacing":true,
+   "jsxBracketSameLine":false,
+   "arrowParens":"always",
+   "requirePragma":false,
+   "insertPragma":false,
+   "proseWrap":"preserve"
+}

LICENSE

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+This project is dual licensed under MIT and Apache-2.0.
+
+MIT: https://www.opensource.org/licenses/mit
+Apache-2.0: https://www.apache.org/licenses/license-2.0

LICENSE-APACHE

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+Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

LICENSE-MIT

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+The MIT License (MIT)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# @libp2p/webrtc
+
+## Install
+
+## Usage
+
+## API
+
+## Contribute
+
+## License

package.json

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+{
+  "name": "js-libp2p-webrtc",
+  "version": "1.0.0",
+  "description": "Dial peer using webrtc",
+  "main": "index.js",
+  "author": "",
+  "license": "Apache-2.0 or MIT",
+  "type": "module",
+  "scripts": {
+    "build": "aegir build",
+    "test": "aegir test",
+    "format": "prettier --write src/*.ts"
+  },
+  "devDependencies": {
+    "@types/uuid": "^8.3.4",
+    "@typescript-eslint/parser": "^5.32.0",
+    "aegir": "^37.4.6",
+    "prettier": "^2.7.1",
+    "typescript": "^4.7.4"
+  },
+  "dependencies": {
+    "@libp2p/components": "^2.0.1",
+    "@libp2p/interface-transport": "^1.0.2",
+    "@libp2p/interfaces": "^3.0.3",
+    "@libp2p/logger": "^2.0.0",
+    "abortable-iterator": "^4.0.2",
+    "socket.io-client": "^4.1.2",
+    "uuid": "^8.3.2"
+  }
+}

src/connection.ts

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+import { Connection } from '@libp2p/interface-connection';
+import { ConnectionStat } from '@libp2p/interface-connection';
+import { Stream, Direction } from '@libp2p/interface-connection';
+import { PeerId } from '@libp2p/interface-peer-id';
+import { AbortOptions } from '@libp2p/interfaces';
+import { logger } from '@libp2p/logger';
+import { Multiaddr } from '@multiformats/multiaddr';
+import { v4 as genUuid } from 'uuid';
+
+const log = logger('libp2p:webrtc:connection');
+
+type ConnectionInit = {
+  id: string;
+  localPeer: PeerId;
+  localAddr?: Multiaddr;
+  remotePeer: PeerId;
+  remoteAddr: Multiaddr;
+  direction: Direction;
+  tags?: string[];
+  stat: ConnectionStat;
+  pc: RTCPeerConnection;
+  credential_string: string;
+};
+
+export class WebRTCConnection implements Connection {
+  id: string;
+  stat: ConnectionStat;
+  remoteAddr: Multiaddr;
+  remotePeer: PeerId;
+  tags: string[] = [];
+  streams: Stream[] = [];
+  direction: Direction;
+
+  private peerConnection: RTCPeerConnection;
+  private ufrag: string;
+
+  constructor(init: ConnectionInit) {
+    this.streams = [];
+    this.remotePeer = init.remotePeer;
+    this.remoteAddr = init.remoteAddr;
+    this.stat = init.stat;
+    this.id = init.id;
+    this.direction = init.direction;
+    this.peerConnection = init.pc;
+    this.ufrag = init.credential_string;
+    // for muxing incoming stream
+    // this._peerConnection.ondatachannel = ({ channel }) => {
+    // 	let stream = DataChannelStream(channel)
+    // 	this.addStream(stream)
+    // }
+  }
+
+  async newStream(multicodecs: string | string[], options?: AbortOptions): Promise<Stream> {
+    // let label = uuid.v4()
+    // let dc = this._peerConnection.createDataChannel(label, {})
+    // await datachannel opening
+    // return DataChannelStream(dc)
+    log('TODO', this.ufrag);
+    this.peerConnection.createDataChannel(genUuid());
+    throw new Error('not implemented');
+  }
+
+  addStream(stream: Stream): void {
+    throw new Error('not implemented');
+  }
+  removeStream(id: string): void {
+    throw new Error('not implemented');
+  }
+  async close(): Promise<void> {
+    throw new Error('not implemented');
+  }
+}

src/index.ts

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+export {};

src/options.ts

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+import { CreateListenerOptions } from '@libp2p/interface-transport';
+import { DialOptions } from '@libp2p/interface-transport';
+
+export interface WebRTCListenerOptions extends CreateListenerOptions {
+  //, WebRTCInitiatorInit {
+  //   channelOptions?: WebRTCReceiverInit
+}
+
+export interface WebRTCDialOptions extends DialOptions {}

src/sdp.ts

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+import { logger } from '@libp2p/logger';
+import { Multiaddr } from '@multiformats/multiaddr';
+
+const log = logger('libp2p:webrtc:sdp');
+
+const P_XWEBRTC: number = 0x115;
+const ANSWER_SDP_FORMAT: string = `
+v=0
+o=- 0 0 IN %s %s
+s=-
+c=IN %s %s
+t=0 0
+m=application %d UDP/DTLS/SCTP webrtc-datachannel
+a=mid:0
+a=ice-options:ice2
+a=ice-ufrag:%s
+a=ice-pwd:%s
+a=fingerprint:%s
+a=setup:actpass
+a=sctp-port:5000
+a=max-message-size:100000
+`;
+
+function ipv(ma: Multiaddr): string {
+  for (let proto of ma.protoNames()) {
+    if (proto.startsWith('ip')) {
+      return proto.toUpperCase();
+    }
+  }
+  log('Warning: multiaddr does not appear to contain IP4 or IP6.', ma);
+  return 'IP6';
+}
+function ip(ma: Multiaddr): string {
+  return ma.toOptions().host;
+}
+function port(ma: Multiaddr): number {
+  return ma.toOptions().port;
+}
+function certhash(ma: Multiaddr): string {
+  let webrtc_value = ma
+    .stringTuples()
+    .filter((tup) => tup[0] == P_XWEBRTC)
+    .map((tup) => tup[1])[0];
+  if (webrtc_value) {
+    return webrtc_value.split('/')[1];
+  } else {
+    throw new Error("Couldn't find a webrtc component of multiaddr:" + ma.toString());
+  }
+}
+
+function ma2sdp(ma: Multiaddr, ufrag: string): string {
+  return ANSWER_SDP_FORMAT.replace('/%s/', ipv(ma))
+    .replace('/%s/', ip(ma))
+    .replace('/%s/', ipv(ma))
+    .replace('/%s/', ip(ma))
+    .replace('/%s/', port(ma).toString())
+    .replace('/%s/', ufrag)
+    .replace('/%s/', ufrag)
+    .replace('/%s/', certhash(ma));
+}
+
+export function fromMultiAddr(ma: Multiaddr, ufrag: string): RTCSessionDescriptionInit {
+  return {
+    type: 'offer',
+    sdp: ma2sdp(ma, ufrag),
+  };
+}
+
+export function munge(desc: RTCSessionDescription, ufrag: string) {
+  //TODO
+  desc.sdp.replaceAll(/^a=ice-ufrag=(.*)/, 'a=ice-ufrag=' + ufrag);
+  desc.sdp.replaceAll(/^a=ice-pwd=(.*)/, 'a=ice-pwd=' + ufrag);
+}