Add algorand auth

packages/ipfs-w3auth/auth-algorand/.eslintignore

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+build/

packages/ipfs-w3auth/auth-algorand/.eslintrc.json

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+{
+  "extends": "./node_modules/gts/"
+}

packages/ipfs-w3auth/auth-algorand/.prettierrc.js

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+module.exports = {
+  ...require('gts/.prettierrc.json')
+}

packages/ipfs-w3auth/auth-algorand/package.json

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+{
+  "name": "@crustio/ipfs-w3auth-algorand",
+  "version": "0.0.3",
+  "description": "Algorand authentication of IPFS W3Auth",
+  "main": "./src/index.js",
+  "license": "Apache-2.0",
+  "scripts": {
+    "build:types": "npx ts-node src/scripts/generate.ts",
+    "lint": "gts lint",
+    "clean": "gts clean",
+    "compile": "tsc",
+    "fix": "gts fix"
+  },
+  "dependencies": {
+    "algosdk": "^2.7.0"
+  },
+  "devDependencies": {
+    "@babel/runtime": "^7.13.2",
+    "@types/node": "^14.17.21",
+    "gts": "^3.1.0",
+    "typescript": "^4.1.3"
+  }
+}

packages/ipfs-w3auth/auth-algorand/src/index.ts

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+import {AuthData} from './types';
+import {verifyBytes} from 'algosdk';
+
+async function auth(data: AuthData): Promise<boolean> {
+  return verifyBytes(
+    Buffer.from(data.address),
+    Buffer.from(data.signature, 'base64'),
+    data.address
+  );
+}
+
+export default {
+  auth,
+};

packages/ipfs-w3auth/auth-algorand/src/types.ts

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+interface AuthData {
+  address: string;
+  signature: string;
+}
+
+class AuthError extends Error {
+  constructor(msg: string) {
+    super(msg);
+    Object.setPrototypeOf(this, AuthError.prototype);
+  }
+}
+
+export {AuthData, AuthError};

packages/ipfs-w3auth/auth-algorand/tsconfig.json

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+{
+    "compilerOptions": {
+        "target": "es6",
+        "module": "commonjs",
+        "rootDir": "./",
+        "outDir": "build",
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "declaration": true
+    }
+}