Test read hosts file from main script, implement safe api

README.md

@@ -6,4 +6,6 @@
 
 `npm run watch`
 
-`npm run typecheck`
+`npm run typecheck`
+
+`npm run lint`

packages/main/src/hosts-file-helper.ts

@@ -0,0 +1,48 @@
+import { accessSync, constants, readFile } from 'fs';
+
+//const hostsFilePath = '/etc/hosts';
+//const hostsDelimiterStart = '# ----- HostsFileEdit config - Do not delete -----';
+//const hostsDelimiterEnd   = '# -----      HostsFileEdit config - End      -----';
+//const regex = /(?:# ----- HostsFileEdit config - Do not delete -----\n)([\s\S]*)(?:# -----      HostsFileEdit config - End      -----\n?)/g;
+const hostsFilePaths: Record<string, string> = {
+  'linux': '/etc/hosts',
+  'darwin': '/etc/hosts',
+  'win32': 'C:\\Windows\\System32\\drivers\\etc\\hosts', // TODO: What if Windows is not on C:?
+  // Might be able to support others? https://nodejs.org/api/process.html#process_process_platform
+};
+
+export const readHostsFile = function(): Promise<string> {
+  return new Promise((resolve, reject) => {
+    const path = hostsFilePaths[process.platform];
+    if (!path) {
+      reject(`Platform ${process.platform} not supported`);
+    } else {
+      try {
+        accessSync(path, constants.R_OK);
+      } catch (error) {
+        reject(`Tried to read file ${path} but file is not readable`);
+      }
+
+      readFile(path, 'utf-8', (err, data) => {
+        if (err) {
+            reject(err);
+        } else {
+            resolve(data);
+        }
+      });
+    }
+
+    // try {
+    //     accessSync(path, constants.R_OK);
+    // } catch (error) {
+    //     throw `Tried to read file ${path} but file is not readable`;
+    // }
+
+    // const content = readFileSync(path);
+
+    // return content;
+
+
+
+  });
+};

packages/main/src/index.ts

@@ -1,7 +1,7 @@
-import {app, BrowserWindow} from 'electron';
+import {app, BrowserWindow, ipcMain} from 'electron';
 import {join} from 'path';
 import {URL} from 'url';
-
+import {readHostsFile} from '/@/hosts-file-helper';
 
 const isSingleInstance = app.requestSingleInstanceLock();
 
@@ -99,3 +99,8 @@ if (import.meta.env.PROD) {
     .catch((e) => console.error('Failed check updates:', e));
 }
 
+
+// Events
+ipcMain.handle('app:read-hosts-file', () => {
+  return readHostsFile();
+});

packages/preload/src/index.ts

@@ -1,4 +1,4 @@
-import {contextBridge} from 'electron';
+import {contextBridge, ipcRenderer } from 'electron';
 
 const apiKey = 'electron';
 /**
@@ -9,6 +9,12 @@ const api: ElectronApi = {
   platform: process.platform,
 };
 
+contextBridge.exposeInMainWorld('fileHelper', {
+  readFile: () => {
+    return ipcRenderer.invoke('app:read-hosts-file');
+  },
+});
+
 /**
  * If contextIsolated enabled use contextBridge
  * Else use fallback

packages/preload/types/electron-api.d.ts

@@ -4,7 +4,12 @@ interface ElectronApi {
   readonly platform: Readonly<string>
 }
 
+interface FileHelper {
+  readonly readFile: () => Promise
+}
+
 declare interface Window {
   electron: Readonly<ElectronApi>
   electronRequire?: NodeRequire
+  fileHelper: FileHelper
 }

packages/renderer/src/App.vue

@@ -54,8 +54,12 @@ export default defineComponent({
       this.$store.commit('addNewHost');
     },
     saveHostsFile() {
-      let mm = 'tt';
-      mm.charAt(4);
+      const p = window.fileHelper.readFile();
+      p.then((result: string) => {
+        console.log(result);
+      }).catch((error: Error) => {
+        console.log('something was wrong', error);
+      });
     },
     importHostsList() {
       let mm = 'tt';