1  import { ethers } from "ethers";
 2  import crypto from "crypto";
 3  
 4  export class EthersService {
 5    constructor(fsService, configService, osService, shellService) {
 6      this.fs = fsService;
 7      this.configService = configService;
 8      this.os = osService;
 9      this.shell = shellService;
10    }
11  
12    getOrCreateEthKey = () => {
13      const paths = this.configService.getEthFilePaths();
14  
15      if (!this.fs.isFile(paths.key)) {
16        this.generateAndSaveKey(paths);
17      }
18  
19      const address = this.fs.readFile(paths.address);
20  
21      return {
22        privateKeyFilePath: paths.key,
23        addressFilePath: paths.address,
24        address: address,
25      };
26    };
27  
28    generateAndSaveKey = async (paths) => {
29      const keys = this.generateKey();
30      this.fs.writeFile(paths.key, keys.key);
31      this.fs.writeFile(paths.address, keys.address);
32  
33      if (this.os.isWindows()) {
34        const username = this.os.getUsername();
35        this.shell.run(`icacls ${paths.key} /inheritance:r >nul 2>&1`);
36        this.shell.run(`icacls ${paths.key} /grant:r ${username}:F >nul 2>&1`);
37        this.shell.run(`icacls ${paths.key} /remove SYSTEM >nul 2>&1`);
38        this.shell.run(`icacls ${paths.key} /remove Administrators >nul 2>&1`);
39      } else {
40        this.shell.run(`chmod 600 "${paths.key}"`);
41      }
42    };
43  
44    generateKey = () => {
45      var id = crypto.randomBytes(32).toString("hex");
46      var privateKey = "0x" + id;
47      var wallet = new ethers.Wallet(privateKey);
48      return {
49        key: privateKey,
50        address: wallet.address,
51      };
52    };
53  }