feat: Handle privilege escalation gracefully even without PolicyKit (#599)

* feat: Handle privilege escalation gracefully even without PolicyKit

* build: upgrade tslint => 5.9.1

* build: add uhk-agent/package-lock.json

* feat: add error animation

* fix: display agent icon when user use ALT + TAB

packages/uhk-web/src/app/components/privilege-checker/privilege-checker.component.html

@@ -1,4 +1,39 @@
-<span class="privilege-checker-wrapper">
-    <uhk-message header="Cannot talk to your UHK" subtitle="Your UHK has been detected, but its permissions are not set up yet, so Agent can't talk to it."></uhk-message>
-    <button class="btn btn-default btn-lg btn-primary" (click)="setUpPermissions()"> Set up permissions </button>
-</span>
+<div class="privilege-checker-wrapper">
+    <uhk-message header="Cannot talk to your UHK"
+                 subtitle="Your UHK has been detected, but its permissions are not set up yet, so Agent can't talk to it."></uhk-message>
+
+    <button class="btn btn-default btn-lg btn-primary"
+            (click)="setUpPermissions()"> Set up permissions
+    </button>
+
+    <div class="mt-10">
+        <a class="link-inline"
+           *ngIf="state.showWhatWillThisDo"
+           (click)="whatWillThisDo()">What will this do?
+        </a>
+
+        <div>
+            <p class="privilege-error"
+               #privilegeError
+               *ngIf="state.permissionSetupFailed">
+                Agent wasn't able to set up permissions via PolicyKit. This is most likely because the
+                <code>polkit</code> package is not installed on your system.
+            </p>
+
+            <div *ngIf="state.showWhatWillThisDoContent">
+                Agent uses the following script to set up permissions. You can run it manually as root, then
+                <a class="link-inline"
+                   (click)="retry()">retry</a>.
+                <div class="copy-container">
+                    <span class="fa  fa-2x fa-copy"
+                          ngxClipboard
+                          [cbContent]="command"
+                          title="Copy to clipboard"
+                          data-toggle="tooltip"
+                          data-placement="top"></span>
+                    <pre><code>{{ command }}</code></pre>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>

packages/uhk-web/src/app/components/privilege-checker/privilege-checker.component.scss

@@ -9,3 +9,19 @@
 uhk-message {
     max-width: 50%;
 }
+
+.privilege-error {
+    animation: error-fade-in 2s;
+}
+
+@keyframes error-fade-in {
+    0% {
+        color: white;
+        background-color: red;
+    }
+
+    100% {
+        color: inherit;
+        background-color: inherit;
+    }
+}

packages/uhk-web/src/app/components/privilege-checker/privilege-checker.component.ts

@@ -1,26 +1,61 @@
-import { Component } from '@angular/core';
-import { Router } from '@angular/router';
+import { ChangeDetectionStrategy, ChangeDetectorRef, Component, OnDestroy, OnInit } from '@angular/core';
 import { Store } from '@ngrx/store';
-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 { Subscription } from 'rxjs/Subscription';
 
-import { AppState } from '../../store/index';
+import { AppState, getPrivilegePageState } from '../../store';
 import { SetPrivilegeOnLinuxAction } from '../../store/actions/device';
+import { LoadAppStartInfoAction, PrivilegeWhatWillThisDoAction } from '../../store/actions/app';
+import { PrivilagePageSate } from '../../models/privilage-page-sate';
 
 @Component({
     selector: 'privilege-checker',
+    changeDetection: ChangeDetectionStrategy.OnPush,
     templateUrl: './privilege-checker.component.html',
     styleUrls: ['./privilege-checker.component.scss']
 })
-export class PrivilegeCheckerComponent {
 
-    constructor(protected store: Store<AppState>) {
+export class PrivilegeCheckerComponent implements OnInit, OnDestroy {
+
+    state: PrivilagePageSate;
+
+    command = `cat <<EOF >/etc/udev/rules.d/50-uhk60.rules
+# Ultimate Hacking Keyboard rules
+# These are the udev rules for accessing the USB interfaces of the UHK as non-root users.
+# Copy this file to /etc/udev/rules.d and physically reconnect the UHK afterwards.
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="1d50", ATTRS{idProduct}=="612[0-7]", MODE:="0666"
+EOF
+udevadm trigger
+udevadm settle`;
+
+    private stateSubscription: Subscription;
+
+    constructor(private store: Store<AppState>,
+                private cdRef: ChangeDetectorRef) {
+    }
+
+    ngOnInit(): void {
+        this.stateSubscription = this.store.select(getPrivilegePageState)
+            .subscribe(state => {
+                this.state = state;
+                this.cdRef.markForCheck();
+            });
+    }
+
+    ngOnDestroy(): void {
+        if (this.stateSubscription) {
+            this.stateSubscription.unsubscribe();
+        }
     }
 
     setUpPermissions(): void {
         this.store.dispatch(new SetPrivilegeOnLinuxAction());
     }
+
+    whatWillThisDo(): void {
+        this.store.dispatch(new PrivilegeWhatWillThisDoAction());
+    }
+
+    retry(): void {
+        this.store.dispatch(new LoadAppStartInfoAction());
+    }
 }