Linux permission setup

Closes #260

electron/src/components/privilege-checker/privilege-checker.component.ts

@@ -2,12 +2,17 @@ import { Component } from '@angular/core';
 import { Router } from '@angular/router';
 
 import { Observable } from 'rxjs/Observable';
+import { ReplaySubject } from 'rxjs/ReplaySubject';
 import 'rxjs/add/observable/of';
 import 'rxjs/add/observable/throw';
 import 'rxjs/add/operator/distinctUntilChanged';
 import 'rxjs/add/operator/ignoreElements';
 import 'rxjs/add/operator/takeWhile';
 
+import { remote } from 'electron';
+import * as path from 'path';
+import * as sudo from 'sudo-prompt';
+
 import { UhkDeviceService } from './../../services/uhk-device.service';
 
 @Component({
@@ -27,13 +32,44 @@ export class PrivilegeCheckerComponent {
                     router.navigate(['/detection']);
                 }
             });
-
     }
 
-    checkPermissions(): Observable<boolean> {
-        return Observable.of(true);
+    setUpPermissions(): void {
+        let permissionSetter: Observable<void>;
+        switch (process.platform) {
+            case 'linux':
+                permissionSetter = this.setUpPermissionsOnLinux();
+                break;
+            default:
+                permissionSetter = Observable.throw('Permissions couldn\'t be set. Invalid platform: ' + process.platform);
+                break;
+        }
+        permissionSetter.subscribe({
+            error: e => console.error(e),
+            complete: () => {
+                console.log('Permissions has been successfully set');
+                this.uhkDevice.initialize();
+                this.router.navigate(['/']);
+            }
+        });
     }
 
-    setUpPermissions() { }
+    private setUpPermissionsOnLinux(): Observable<void> {
+        const subject = new ReplaySubject<void>();
+        const rootDir = path.resolve(path.join(remote.process.cwd(), remote.process.argv[1]), '..');
+        const scriptPath = path.resolve(rootDir, 'rules/setup-rules.sh');
+        const options = {
+            name: 'Setting UHK access rules'
+        };
+        sudo.exec(`sh ${scriptPath}`, options, (error: any) => {
+            if (error) {
+                subject.error(error);
+            } else {
+                subject.complete();
+            }
+        });
+
+        return subject.asObservable();
+    }
 
 }