wip: qr implementation

packages/keyring-eth-qr/CHANGELOG.md

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+# Changelog
+

packages/keyring-eth-qr/LICENSE

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+ISC License
+
+Copyright (c) 2020 MetaMask
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

packages/keyring-eth-qr/README.md

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+# QR Keyring

packages/keyring-eth-qr/jest.config.js

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+/*
+ * For a detailed explanation regarding each configuration property and type check, visit:
+ * https://jestjs.io/docs/configuration
+ */
+
+const merge = require('deepmerge');
+const path = require('path');
+
+const baseConfig = require('../../jest.config.packages');
+
+const displayName = path.basename(__dirname);
+
+module.exports = merge(baseConfig, {
+  // The display name when running multiple projects
+  displayName,
+
+  // An array of regexp pattern strings used to skip coverage collection
+  coveragePathIgnorePatterns: ['./src/tests'],
+
+  // An object that configures minimum threshold enforcement for coverage results
+  coverageThreshold: {
+    global: {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
+  },
+});

packages/keyring-eth-qr/package.json

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+{
+  "name": "@metamask/eth-qr-keyring",
+  "version": "1.0.0",
+  "description": "A simple standard interface for a series of Ethereum private keys.",
+  "keywords": [
+    "ethereum",
+    "keyring",
+    "qr",
+    "metamask"
+  ],
+  "homepage": "https://github.com/MetaMask/accounts/packages/keyring-eth-qr#readme",
+  "bugs": {
+    "url": "https://github.com/MetaMask/accounts/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/MetaMask/accounts.git"
+  },
+  "main": "dist/index.js",
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist/"
+  ],
+  "scripts": {
+    "build": "tsc --build tsconfig.build.json",
+    "build:clean": "rimraf dist && yarn build",
+    "build:docs": "typedoc",
+    "build:force": "tsc --build tsconfig.build.json --force",
+    "changelog:update": "../../scripts/update-changelog.sh @metamask/eth-simple-keyring",
+    "changelog:validate": "../../scripts/validate-changelog.sh @metamask/eth-simple-keyring",
+    "publish:preview": "yarn npm publish --tag preview",
+    "sample": "ts-node src/sample.ts",
+    "test": "jest",
+    "test:clean": "jest --clearCache",
+    "test:verbose": "jest --verbose",
+    "test:watch": "jest --watch"
+  },
+  "dependencies": {
+    "@ethereumjs/util": "^9.1.0",
+    "@keystonehq/bc-ur-registry-eth": "^0.21.0",
+    "@keystonehq/ur-decoder": "^0.12.2",
+    "@metamask/utils": "^9.2.1",
+    "@ngraveio/bc-ur": "^1.1.13",
+    "hdkey": "^2.1.0"
+  },
+  "devDependencies": {
+    "@lavamoat/allow-scripts": "^3.2.1",
+    "@metamask/auto-changelog": "^3.4.4",
+    "@types/hdkey": "^2.0.1",
+    "@types/jest": "^29.5.12",
+    "@types/node": "^20.12.12",
+    "deepmerge": "^4.2.2",
+    "depcheck": "^1.4.7",
+    "jest": "^29.5.0",
+    "ts-jest": "^29.0.5",
+    "ts-node": "^10.9.2",
+    "typedoc": "^0.25.13",
+    "typescript": "~4.8.4"
+  },
+  "engines": {
+    "node": "^18.18 || >=20"
+  },
+  "publishConfig": {
+    "access": "public",
+    "registry": "https://registry.npmjs.org/"
+  },
+  "lavamoat": {
+    "allowScripts": {
+      "keccak": true,
+      "secp256k1": true,
+      "@lavamoat/preinstall-always-fail": false,
+      "ethereumjs-tx>ethereumjs-util>ethereum-cryptography>keccak": false,
+      "ethereumjs-tx>ethereumjs-util>ethereum-cryptography>secp256k1": false
+    }
+  }
+}

packages/keyring-eth-qr/src/account-deriver.ts

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+import { pubToAddress } from '@ethereumjs/util';
+import {
+  CryptoAccount,
+  type CryptoHDKey,
+  type CryptoOutput,
+} from '@keystonehq/bc-ur-registry-eth';
+import { add0x, getChecksumAddress, type Hex } from '@metamask/utils';
+import HDKey from 'hdkey';
+
+export type RootAccount = { fingerprint: Hex } & (
+  | {
+      type: 'hd';
+      hdPath: string;
+      childrenPath: string;
+      bip32xPub: string;
+    }
+  | {
+      type: 'account';
+      addressPaths: Record<Hex, string>;
+    }
+);
+
+export class AccountDeriver {
+  #root?: RootAccount;
+
+  init(source: CryptoAccount | CryptoHDKey) {
+    const fingerprint = this.#getFingerprintFromSource(source);
+    if (source instanceof CryptoAccount) {
+      this.#root = {
+        fingerprint,
+        type: 'account',
+        addressPaths: this.#getPathsFromCryptoOutputDescriptors(
+          source.getOutputDescriptors(),
+        ),
+      };
+    } else {
+      this.#root = {
+        fingerprint,
+        type: 'hd',
+        hdPath: `m/${source.getOrigin().getPath()}`,
+        childrenPath: source.getChildren().getPath(),
+        bip32xPub: source.getBip32Key(),
+      };
+    }
+  }
+
+  deriveIndex(index: number): Hex {
+    if (!this.#root) {
+      throw new Error('AccountDeriver not initialized');
+    }
+
+    if (this.#root.type === 'account') {
+      const address = Object.keys(this.#root.addressPaths)[index];
+      if (!address) {
+        throw new Error(`Address not found for index ${index}`);
+      }
+      return add0x(address);
+    } else {
+      const hdKey = HDKey.fromExtendedKey(this.#root.bip32xPub);
+      hdKey.derive(`m/${index}`);
+      const address = getChecksumAddress(
+        add0x(Buffer.from(pubToAddress(hdKey.publicKey, true)).toString('hex')),
+      );
+      return add0x(address);
+    }
+  }
+
+  #getFingerprintFromSource(source: CryptoAccount | CryptoHDKey): Hex {
+    return source instanceof CryptoAccount
+      ? add0x(source.getMasterFingerprint().toString('hex'))
+      : add0x(source.getOrigin().getSourceFingerprint().toString('hex'));
+  }
+
+  #getPathsFromCryptoOutputDescriptors(
+    descriptors: CryptoOutput[],
+  ): Record<Hex, string> {
+    return descriptors.reduce((paths: Record<Hex, string>, current) => {
+      const hdKey = current.getHDKey();
+      if (hdKey) {
+        const path = `M/${hdKey.getOrigin().getPath()}`;
+        const address = getChecksumAddress(
+          add0x(
+            Buffer.from(pubToAddress(hdKey.getKey(), true)).toString('hex'),
+          ),
+        );
+        paths[address] = path;
+      }
+      return paths;
+    }, {});
+  }
+}

packages/keyring-eth-qr/src/index.ts

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+export * from './qr-keyring';

packages/keyring-eth-qr/src/qr-keyring.ts

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+import { CryptoAccount, CryptoHDKey } from '@keystonehq/bc-ur-registry-eth';
+import { URRegistryDecoder } from '@keystonehq/ur-decoder';
+import type { Hex, Keyring } from '@metamask/utils';
+import { UR } from '@ngraveio/bc-ur';
+import { AccountDeriver } from './account-deriver';
+
+export const QR_KEYRING_TYPE = 'QrKeyring' as const;
+
+export const SUPPORTED_UR_TYPE = {
+  CRYPTO_HDKEY: 'crypto-hdkey',
+  CRYPTO_ACCOUNT: 'crypto-account',
+  ETH_SIGNATURE: 'eth-signature',
+};
+
+/**
+ * The state of the QrKeyring
+ *
+ * @property accounts - The accounts in the QrKeyring
+ */
+export type QrKeyringState = {
+  accounts: Record<number, Hex>;
+  cbor?: Hex;
+};
+
+export class QrKeyring implements Keyring<QrKeyringState> {
+  type = QR_KEYRING_TYPE;
+
+  #accounts: Record<number, Hex> = {};
+
+  #deriver: AccountDeriver = new AccountDeriver();
+
+  async serialize(): Promise<QrKeyringState> {
+    return {
+      accounts: Object.values(this.#accounts),
+      cbor: '', // TODO: Serialize deriver
+    };
+  }
+
+  async deserialize(state: QrKeyringState): Promise<void> {
+    this.#accounts = state.accounts;
+    if (state.cbor) {
+      this.submitCBOR(state.cbor);
+    }
+  }
+
+  async addAccounts(_accountsToAdd: number): Promise<Hex[]> {
+    // TODO: Implement
+  }
+
+  async getAccounts(): Promise<Hex[]> {
+    return Object.values(this.#accounts);
+  }
+
+  submitCBOR(cbor: Hex) {
+    const ur = URRegistryDecoder.decode(cbor);
+    const bufferedCbor = Buffer.from(cbor, 'hex');
+    let derivationSource: CryptoHDKey | CryptoAccount;
+
+    switch (ur.type) {
+      case SUPPORTED_UR_TYPE.CRYPTO_HDKEY:
+        derivationSource = CryptoHDKey.fromCBOR(bufferedCbor);
+        break;
+      case SUPPORTED_UR_TYPE.CRYPTO_ACCOUNT:
+        derivationSource = CryptoAccount.fromCBOR(bufferedCbor);
+        break;
+      default:
+        throw new Error('Unsupported UR type');
+    }
+
+    this.#deriver.init(derivationSource);
+  }
+
+  async setAccountToUnlock(index: number): Promise<void> {
+    // TODO: Implement
+  }
+}

packages/keyring-eth-qr/tsconfig.build.json

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+{
+  "extends": "../../tsconfig.packages.build.json",
+  "compilerOptions": {
+    "baseUrl": "./",
+    "outDir": "dist",
+    "rootDir": "src",
+    "target": "es2020"
+  },
+  "include": ["./src/**/*.ts"],
+  "exclude": ["./src/**/*.test.ts", "./src/sample.ts"]
+}

packages/keyring-eth-qr/tsconfig.json

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+{
+  "extends": "../../tsconfig.packages.json",
+  "compilerOptions": {
+    "baseUrl": "./"
+  },
+  "include": ["./src"],
+  "exclude": ["./dist/**/*"]
+}

packages/keyring-eth-qr/typedoc.json

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+{
+  "entryPoints": ["./src/index.ts"],
+  "excludePrivate": true,
+  "hideGenerator": true,
+  "out": "docs"
+}

tsconfig.build.json

@@ -2,6 +2,7 @@
   "references": [
     { "path": "./packages/keyring-api/tsconfig.build.json" },
     { "path": "./packages/keyring-eth-ledger-bridge/tsconfig.build.json" },
+    { "path": "./packages/keyring-eth-qr/tsconfig.build.json" },
     { "path": "./packages/keyring-eth-simple/tsconfig.build.json" },
     { "path": "./packages/keyring-eth-trezor/tsconfig.build.json" },
     { "path": "./packages/keyring-snap-bridge/tsconfig.build.json" }