Implements Zcash login

2021-10-15 14:14:49 -05:00 · 2021-10-15 14:14:49 -05:00 · 6059c04b75
commit 6059c04b75
parent 9926a1a4fe
40 changed files with 16742 additions and 615 deletions
--- a/angular.json
+++ b/angular.json
@ -1,5 +1,8 @@
 {
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "cli": {
+    "analytics": false
+  },
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
@ -27,6 +30,7 @@
              "src/assets"
            ],
            "styles": [
+              "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
              "src/styles.css"
            ],
            "scripts": []
@ -94,6 +98,7 @@
              "src/assets"
            ],
            "styles": [
+              "./node_modules/@angular/material/prebuilt-themes/indigo-pink.css",
              "src/styles.css"
            ],
            "scripts": []
--- a/backend/app.js
+++ b/backend/app.js
@ -0,0 +1,125 @@
+const express = require('express');
+const bodyparser = require('body-parser');
+const app = express();
+const postmodel = require('./models/post');
+const usermodel = require('./models/user');
+const mongoose = require('mongoose');
+const stdrpc = require('stdrpc');
+//const RequestIP = require('@supercharge/request-ip');
+
+var db = require('./config/db');
+mongoose.connect(db.url).then(() => {
+	console.log("connecting-- ", db);
+}).catch(() => {
+	console.log("connection failed!");
+});
+
+var fullnode = require('./config/fullnode');
+const rpc = stdrpc({
+	url: fullnode.url,
+	username: fullnode.username,
+	password: fullnode.password
+});
+
+app.use(bodyparser.json());
+
+app.use((req, res, next) => {
+	res.setHeader("Access-Control-Allow-Origin", "*");
+	res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
+	res.setHeader("Access-Control-Allow-Methods", "GET, POST, PATCH, DELETE, OPTIONS");
+	//req.ip = RequestIP.getClientIp(req);
+	next();
+});
+
+app.post('/api/posts', (req, res, next) => {
+	const post = new postmodel({
+		title: req.body.title,
+		content: req.body.content
+	});
+	post.save();
+	//console.log(req.ip);
+	res.status(201).json({
+		message: 'Post added successfully'
+	});
+});
+
+app.get('/api/posts', (req, res, next) => {
+	postmodel.find().
+		then((documents) => {
+			//console.log(documents);
+			res.status(200).json({
+				message: 'Posts Fetched successfully',
+				posts: documents
+			});
+		});
+});
+
+app.post('/api/users', (req, res, next) => {
+	const user = new usermodel({
+		address: req.body.address,
+		session: req.body.session,
+		blocktime: req.body.blocktime
+	});
+	user.save();
+	res.status(201).json({
+		message: 'User added successfully'
+	});
+});
+
+app.get('/api/users', (req, res, next) => {
+	//console.log(req.query);
+	usermodel.find({'address': req.query.address, 'session': req.query.session}).
+		then((documents) => {
+			console.log("Searching");
+			res.status(200).json({
+				message: 'Users found successfully',
+				users: documents
+			});
+		});
+});
+
+app.get('/api/getuser', (req, res, next) => {
+	usermodel.find({'session': req.query.session}).
+		then((documents) => {
+			console.log("Searching for user...");
+			if(documents.length > 0){
+				//console.log(documents);
+				res.status(200).json({
+					message: 'User found!',
+					user: documents
+				});
+			} else {
+				res.status(204).json({
+					message: 'User not found!',
+					user: null
+				});
+			}
+		});
+});
+
+app.get('/api/blockheight', (req, res, next) => {
+	rpc.getblock("-1", 1).then(block => {
+		res.status(200).json({
+			message: 'Found block',
+			height: block.height
+		});
+	});
+});
+
+app.get('/api/txs', (req, res, next) => {
+	rpc.z_listreceivedbyaddress(fullnode.addr, 5).then(txs => {
+		res.status(200).json({
+			message: 'Transactions found',
+			txs: txs
+		});
+	});
+});
+
+app.get('/api/getaddr', (req, res, next) => {
+	res.status(200).json({
+		message: 'Sending address',
+		addr: fullnode.addr
+	});
+});
+
+module.exports = app;
--- a/backend/config/db.js
+++ b/backend/config/db.js
@ -0,0 +1,3 @@
+module.exports = {
+	url : 'mongodb://localhost:27017/test'
+}
--- a/backend/config/fullnode.js
+++ b/backend/config/fullnode.js
@ -0,0 +1,6 @@
+module.exports = {
+	url: 'http://localhost:8232',
+	username: 'zecwallet',
+	password: 'rdsxlun6v4a',
+	addr: 'zs1xnpqd2tae9d95f8fhe4l0q7j44a5vf993m0pcnnvr56uqr4lgqlamesk5v4c5rhtvywc6lvlduy'
+}
--- a/backend/models/post.js
+++ b/backend/models/post.js
@ -0,0 +1,8 @@
+const mongoose = require('mongoose');
+
+const postSchema = mongoose.Schema({
+	title: {type: String, required:true},
+	content: {type: String, required:true}
+});
+
+module.exports = mongoose.model('Post', postSchema);
--- a/backend/models/user.js
+++ b/backend/models/user.js
@ -0,0 +1,9 @@
+const mongoose = require('mongoose');
+
+const userSchema = mongoose.Schema({
+	address: {type: String, required:true},
+	session: {type: String, required:true},
+	blocktime: {type: Number, required:true}
+});
+
+module.exports = mongoose.model('User', userSchema);
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@ -11,15 +11,22 @@
  "private": true,
  "dependencies": {
    "@angular/animations": "~12.2.0",
+    "@angular/cdk": "^12.2.8",
    "@angular/common": "~12.2.0",
    "@angular/compiler": "~12.2.0",
    "@angular/core": "~12.2.0",
    "@angular/forms": "~12.2.0",
+    "@angular/material": "^12.2.8",
    "@angular/platform-browser": "~12.2.0",
    "@angular/platform-browser-dynamic": "~12.2.0",
    "@angular/router": "~12.2.0",
+    "@supercharge/request-ip": "^1.1.2",
+    "angular-local-storage": "^0.7.1",
+    "easyqrcodejs": "^4.4.6",
    "rxjs": "~6.6.0",
    "tslib": "^2.3.0",
+    "urlsafe-base64": "^1.0.0",
+    "uuid": "^8.3.2",
    "zone.js": "~0.11.4"
  },
  "devDependencies": {
@ -27,7 +34,9 @@
    "@angular/cli": "~12.2.8",
    "@angular/compiler-cli": "~12.2.0",
    "@types/jasmine": "~3.8.0",
-    "@types/node": "^12.11.1",
+    "@types/node": "^12.20.33",
+    "@types/urlsafe-base64": "^1.0.28",
+    "@types/uuid": "^8.3.1",
    "jasmine-core": "~3.8.0",
    "karma": "~6.3.0",
    "karma-chrome-launcher": "~3.1.0",
--- a/server.js
+++ b/server.js
@ -0,0 +1,9 @@
+const http = require('http');
+const app = require('./backend/app');
+const port = 3000;
+
+app.set('port', port);
+
+const server = http.createServer(app);
+
+server.listen(port);
--- a/src/app/app-routing.module.ts
+++ b/src/app/app-routing.module.ts
@ -1,10 +1,21 @@
 import { NgModule } from '@angular/core';
 import { RouterModule, Routes } from '@angular/router';
+import { PostCreateComponent } from './posts/post-create/post-create.component';
+import { PostListComponent } from './posts/post-list/post-list.component';
+import { ViewerComponent } from './viewer/viewer.component';
+import { LoginComponent } from './login/login.component';
+import { AuthGuardService } from './auth-guard.service';

-const routes: Routes = [];
+const routes: Routes = [
+	{ path: '', component: LoginComponent },
+	{ path: 'create', component: PostCreateComponent, canActivate: [AuthGuardService]},
+	{ path: 'view', component: PostListComponent, canActivate: [AuthGuardService]},
+	{ path: 'login', component: LoginComponent}
+];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
-  exports: [RouterModule]
+  exports: [RouterModule],
+  providers: [AuthGuardService]
 })
 export class AppRoutingModule { }
--- a/src/app/app.component.css
+++ b/src/app/app.component.css
@ -0,0 +1,5 @@
+main{
+	margin-top: 16px;
+	width: 80%;
+	margin: auto;
+}
--- a/src/app/app.component.html
+++ b/src/app/app.component.html
@ -1,501 +1,4 @@
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * * * The content below * * * * * * * * * * * -->
-<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
-<!-- * * * * * * * * * * and can be replaced. * * * * * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * Delete the template below * * * * * * * * * * -->
-<!-- * * * * * * * to get started with your project! * * * * * * * * -->
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-
-<style>
-  :host {
-    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
-    font-size: 14px;
-    color: #333;
-    box-sizing: border-box;
-    -webkit-font-smoothing: antialiased;
-    -moz-osx-font-smoothing: grayscale;
-  }
-
-  h1,
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-    margin: 8px 0;
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-  .toolbar {
-    position: absolute;
-    top: 0;
-    left: 0;
-    right: 0;
-    height: 60px;
-    display: flex;
-    align-items: center;
-    background-color: #1976d2;
-    color: white;
-    font-weight: 600;
-  }
-
-  .toolbar img {
-    margin: 0 16px;
-  }
-
-  .toolbar #twitter-logo {
-    height: 40px;
-    margin: 0 8px;
-  }
-
-  .toolbar #youtube-logo {
-    height: 40px;
-    margin: 0 16px;
-  }
-
-  .toolbar #twitter-logo:hover,
-  .toolbar #youtube-logo:hover {
-    opacity: 0.8;
-  }
-
-  .content {
-    display: flex;
-    margin: 82px auto 32px;
-    padding: 0 16px;
-    max-width: 960px;
-    flex-direction: column;
-    align-items: center;
-  }
-
-  svg.material-icons {
-    height: 24px;
-    width: auto;
-  }
-
-  svg.material-icons:not(:last-child) {
-    margin-right: 8px;
-  }
-
-  .card svg.material-icons path {
-    fill: #888;
-  }
-
-  .card-container {
-    display: flex;
-    flex-wrap: wrap;
-    justify-content: center;
-    margin-top: 16px;
-  }
-
-  .card {
-    all: unset;
-    border-radius: 4px;
-    border: 1px solid #eee;
-    background-color: #fafafa;
-    height: 40px;
-    width: 200px;
-    margin: 0 8px 16px;
-    padding: 16px;
-    display: flex;
-    flex-direction: row;
-    justify-content: center;
-    align-items: center;
-    transition: all 0.2s ease-in-out;
-    line-height: 24px;
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-
-  .card-container .card:not(:last-child) {
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-  .card.card-small {
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-    transition: 1s ease-out;
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-
-  .circle-link:hover {
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-    font-size: 12px;
-    padding: 3px 10px;
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-      <pre *ngSwitchCase="'pwa'">ng add @angular/pwa</pre>
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-    <path id="Path_39" data-name="Path 39" d="M2379.709,863.793c10-93-77-171-168-149-52-114-225-105-264,15-75,3-140,59-152,133-30,2.83-66.725,9.829-93.5,26.25-26.771-16.421-63.5-23.42-93.5-26.25-12-74-77-130-152-133-39-120-212-129-264-15-54.084-13.075-106.753,9.173-138.488,48.9-31.734-39.726-84.4-61.974-138.487-48.9-52-114-225-105-264,15a162.027,162.027,0,0,0-103.147,43.044c-30.633-45.365-87.1-72.091-145.206-58.044-52-114-225-105-264,15-75,3-140,59-152,133-53,5-127,23-130,83-2,42,35,72,70,86,49,20,106,18,157,5a165.625,165.625,0,0,0,120,0c47,94,178,113,251,33,61.112,8.015,113.854-5.72,150.492-29.764a165.62,165.62,0,0,0,110.861-3.236c47,94,178,113,251,33,31.385,4.116,60.563,2.495,86.487-3.311,25.924,5.806,55.1,7.427,86.488,3.311,73,80,204,61,251-33a165.625,165.625,0,0,0,120,0c51,13,108,15,157-5a147.188,147.188,0,0,0,33.5-18.694,147.217,147.217,0,0,0,33.5,18.694c49,20,106,18,157,5a165.625,165.625,0,0,0,120,0c47,94,178,113,251,33C2446.709,1093.793,2554.709,922.793,2379.709,863.793Z" transform="translate(142.69 -634.312)" fill="#eee"/>
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-
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-
-<!-- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -->
-<!-- * * * * * * * * * * * The content above * * * * * * * * * * * -->
-<!-- * * * * * * * * * * is only a placeholder * * * * * * * * * * -->
-<!-- * * * * * * * * * * and can be replaced. * * * * * * * * * * * -->
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-
-<router-outlet></router-outlet>
+<app-header></app-header>
+<main>
+	<router-outlet></router-outlet>
+</main>
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@ -1,4 +1,5 @@
 import { Component } from '@angular/core';
+import { Post} from './posts/post.model';

@Component({
  selector: 'app-root',
@ -6,5 +7,10 @@ import { Component } from '@angular/core';
  styleUrls: ['./app.component.css']
 })
 export class AppComponent {
-  title = 'sell4zec';
+	//StoredPosts: Post[] = [];
+	title = 'sell4zec';
+
+	//onPostAdded(post: Post){
+		//this.StoredPosts.push(post);
+	//}
 }
--- a/src/app/app.module.ts
+++ b/src/app/app.module.ts
@ -1,16 +1,43 @@
 import { NgModule } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';
+import { FormsModule } from '@angular/forms';
+import { MatInputModule } from '@angular/material/input';
+import { MatCardModule } from '@angular/material/card';
+import { MatButtonModule } from '@angular/material/button';
+import { MatToolbarModule } from '@angular/material/toolbar';
+import { MatExpansionModule } from '@angular/material/expansion';
+import { HttpClientModule } from '@angular/common/http';

 import { AppRoutingModule } from './app-routing.module';
 import { AppComponent } from './app.component';
+import { PostCreateComponent } from './posts/post-create/post-create.component';
+import { HeaderComponent } from './header/header.component';
+import { PostListComponent } from './posts/post-list/post-list.component';
+import { PostService } from './posts/posts.service';
+import { ViewerComponent } from './viewer/viewer.component';
+import { LoginComponent } from './login/login.component';
+import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

@NgModule({
  declarations: [
-    AppComponent
+    AppComponent,
+    PostCreateComponent,
+    HeaderComponent,
+	ViewerComponent,
+	LoginComponent,
+    PostListComponent
  ],
  imports: [
    BrowserModule,
-    AppRoutingModule
+    AppRoutingModule,
+    FormsModule,
+    HttpClientModule,
+    MatInputModule,
+    MatCardModule,
+    MatButtonModule,
+    MatToolbarModule,
+    MatExpansionModule,
+    BrowserAnimationsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
--- a/src/app/auth-guard.service.ts
+++ b/src/app/auth-guard.service.ts
@ -0,0 +1,44 @@
+import { Injectable } from '@angular/core';
+import { CanActivate, Router, RouterStateSnapshot, ActivatedRouteSnapshot } from '@angular/router';
+import {HttpClient, HttpParams} from '@angular/common/http';
+import { UserService } from './user.service';
+import { Subscription } from 'rxjs';
+
+@Injectable()
+
+export class AuthGuardService implements CanActivate {
+	private UserSub: Subscription = new Subscription();
+	private addr = '';
+	constructor(
+		private router: Router,
+		private http: HttpClient,
+		public userService: UserService
+	){}
+
+	canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
+		const token = localStorage.getItem('s4z_token');
+
+		if(token != null){
+			this.userService.getUser(token);
+			this.UserSub = this.userService.getZaddrUpdateListener().
+				subscribe((addr) => {
+				if (addr != null) {
+					console.log(addr);
+					this.addr = addr;
+				} else {
+					console.log("No record for that token");
+				}
+			});
+			this.UserSub.unsubscribe();
+			if (this.addr != null) {
+				return true;
+			} else {
+				return false;
+			}
+		} else {
+			console.log("Not logged in");
+			this.router.navigate(['/login']);
+			return false;
+		}
+	}
+}
--- a/src/app/fullnode.service.ts
+++ b/src/app/fullnode.service.ts
@ -0,0 +1,90 @@
+import {Injectable} from '@angular/core';
+import {Subject} from 'rxjs';
+import {HttpClient, HttpParams} from '@angular/common/http';
+import {UserService} from './user.service';
+
+//import {User} from './user.model';
+
+@Injectable({providedIn: 'root'})
+export class FullnodeService{
+	private height = 0;
+	private memoList: string[] = [];
+	private addr: string = '';
+	private heightUpdated = new Subject<number>();
+	private memoUpdated = new Subject<string[]>();
+	private addrUpdated = new Subject<string>();
+
+	constructor(private http: HttpClient, public userService: UserService){
+	}
+
+	getHeight() {
+		this.http.get<{message: string, height: number}>('http://localhost:3000/api/blockheight').
+		subscribe((BlockData) => {
+			this.height = BlockData.height;
+			this.heightUpdated.next(this.height);
+		});
+	}
+
+	getHeightUpdateListener() {
+		return this.heightUpdated;
+	}
+
+	hexToString(hexString: string) {
+		var str = '';
+		for (var n=0; n < hexString.length; n +=2) {
+			str += String.fromCharCode(parseInt(hexString.substr(n, 2), 16));
+		}
+		return str;
+	}
+
+	getMemos() {
+		this.http.get<{message: string, txs: any}>('http://localhost:3000/api/txs').
+		subscribe((TxData) => {
+			var memos: string[] = [];
+			//this.addr = TxData.addr;
+			var re = /.*S4ZEC::(.*)\sReply-To:\s(z\w+)/;
+			for (var i=0; i < TxData.txs.length; i++) {
+				var memo = this.hexToString(TxData.txs[i].memo);
+				//console.log(TxData.txs[i].blocktime);
+				if (re.test(memo)){
+					memos.push(memo);
+					var match = re.exec(memo);
+					if (match != null) {
+						var address = match[2];
+						var session = match[1];
+						var blocktime = TxData.txs[i].blocktime;
+						const params = new HttpParams().append('address', address).append('session', session);
+						this.http.get<{message: string, users: any}>('http://localhost:3000/api/users', {headers:{}, params: params}).
+						subscribe((UserData) => {
+							console.log(UserData.message);
+							console.log(UserData.users.length);
+							if (UserData.users.length == 0){
+								console.log(`No matching user found! Adding ${address} ${session} ${blocktime}`);
+								this.userService.addUser(address, session, blocktime);
+							}
+						});
+					}
+				}
+			}
+			this.memoList = memos;
+			this.memoUpdated.next(this.memoList);
+		});
+	}
+
+	getMemoUpdateListener() {
+		return this.memoUpdated;
+	}
+
+	getAddr() {
+		this.http.get<{message: string, addr: string}>('http://localhost:3000/api/getaddr').
+		subscribe((AddrData) => {
+			this.addr = AddrData.addr;
+			this.addrUpdated.next(this.addr);
+		});
+	}
+
+	getAddrUpdateListener() {
+		return this.addrUpdated;
+	}
+	
+}
--- a/src/app/header/header.component.css
+++ b/src/app/header/header.component.css
@ -0,0 +1,14 @@
+a{
+	text-decoration: none;
+	color: white;
+}
+
+ul{
+	list-style: none;
+	padding: 0;
+	margin: 0;
+}
+
+.spacer{
+	flex: 1 1 auto;
+}
--- a/src/app/header/header.component.html
+++ b/src/app/header/header.component.html
@ -0,0 +1,16 @@
+<mat-toolbar color="primary">
+	<span>
+		<a routerLink = "/">
+			ZEC Block Height: {{height}}
+		</a>
+	</span>
+	<span class="spacer"></span>
+	<ul>
+		<li>
+			<a mat-button routerLink = "/view" routerLinkAcitve = "mat-accent">Viewer</a>
+		</li>
+		<li>
+			<a mat-button routerLink = "/create" routerLinkActive = "mat-accent">New Post</a>
+		</li>
+	</ul>
+</mat-toolbar>
--- a/src/app/header/header.component.ts
+++ b/src/app/header/header.component.ts
@ -0,0 +1,27 @@
+import  { Component, OnInit } from '@angular/core';
+import {FullnodeService} from '../fullnode.service';
+import {Subscription} from 'rxjs';
+
+@Component({
+	selector: 'app-header',
+	templateUrl: './header.component.html',
+	styleUrls: ['./header.component.css']
+})
+
+export class HeaderComponent implements OnInit {
+
+	height = 0;
+	private FullnodeSub: Subscription = new Subscription();
+	constructor(public fullnodeService: FullnodeService){
+	}
+
+
+	ngOnInit(){
+		this.fullnodeService.getHeight();
+		this.FullnodeSub=this.fullnodeService.getHeightUpdateListener().
+			subscribe((height: number) => {
+			this.height = height;
+		});
+	}
+
+}
--- a/src/app/login/login.component.css
+++ b/src/app/login/login.component.css
@ -0,0 +1,3 @@
+* {
+	font-family: 'Roboto Mono', monospace;
+}
--- a/src/app/login/login.component.html
+++ b/src/app/login/login.component.html
@ -0,0 +1,27 @@
+<br>
+<div align="center">
+	<h1>Welcome to Sell4ZEC!</h1>
+</div>
+<table>
+	<colgroup>
+		<col span="1" style="width: 75%;">
+		<col span="1" style="width: 25%;">
+	</colgroup>
+	<tr>
+		<td>
+			<p>A non-custodial point-of-sale application, powered by Zcash.</p>
+		</td>
+		<td>
+			<div align="center" id="info">
+				<p>
+					Ensure you include your Reply-To shielded address!
+				</p>
+				<p>
+					Your shielded address is your username and all payments will be sent to it.
+				</p>
+			</div>
+			<br>
+			<div align="center" id="qrcode"></div>
+		</td>
+	</tr>
+</table>
--- a/src/app/login/login.component.ts
+++ b/src/app/login/login.component.ts
@ -0,0 +1,100 @@
+import { Component, OnInit, OnDestroy, Injectable } from '@angular/core';
+import { CanActivate, Router, RouterStateSnapshot, ActivatedRouteSnapshot } from '@angular/router';
+import { UserService } from '../user.service';
+import { FullnodeService } from '../fullnode.service';
+import { Subscription } from 'rxjs';
+import { v4 as uuidv4 } from 'uuid';
+var QRCode = require('easyqrcodejs');
+var URLSafeBase64 = require('urlsafe-base64');
+var Buffer = require('buffer/').Buffer;
+
+
+@Component({
+	selector: 'app-login',
+	templateUrl: './login.component.html',
+	styleUrls: ['./login.component.css']
+})
+
+export class LoginComponent implements OnInit {
+	memos: string[] = [];
+	private FullnodeSub: Subscription = new Subscription();
+	private UserSub: Subscription = new Subscription();
+	constructor(
+		public fullnodeService: FullnodeService,
+		private router: Router,
+		public userService: UserService
+	){
+	}
+
+	ngOnInit(){
+		this.fullnodeService.getMemos();
+		this.fullnodeService.getAddr();
+		this.FullnodeSub = this.fullnodeService.getAddrUpdateListener().
+			subscribe((addr: string) => {
+			var localToken = localStorage.getItem('s4z_token');
+			console.log(localToken);
+			if(localToken == null){
+				var token = uuidv4();
+				localStorage.setItem('s4z_token', token);
+				console.log('Showing QR code for login');
+				console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token))));
+				var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token)))}`;
+				console.log(codeString);
+				var qrcode = new QRCode(document.getElementById("qrcode"), {
+					text: codeString,
+					logo: "/assets/zcash.png",
+					logoWidth: 80,
+					logoHeight: 80
+				});
+			} else {
+				this.userService.getUser(localToken);
+				this.userService.getZaddrUpdateListener().
+					subscribe((userAddr: string) => {
+					if (userAddr != '') {
+						console.log('Log in found!');
+						this.router.navigate(['/create']);
+					} else {
+						console.log('No login for token found');
+						console.log('Showing QR code for login');
+						//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken))));
+						var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken!)))}`;
+						console.log(codeString);
+						var qrcode = new QRCode(document.getElementById("qrcode"), {
+							text: codeString,
+							logo: "/assets/zcash.png",
+							logoWidth: 80,
+							logoHeight: 80
+						});
+
+					}
+				});
+			}
+		});
+		//this.FullnodeSub=this.fullnodeService.getMemoUpdateListener().
+			//subscribe((memos: string[]) => {
+			//this.memos = memos;
+			//var addr = this.fullnodeService.getAddr();
+			//if(localStorage.getItem('s4z_token') == null){
+				//var token = uuidv4();
+				//localStorage.setItem('s4z_token', token);
+				//console.log('Showing QR code for login');
+				//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token))));
+				//var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token)))}`;
+				//console.log(codeString);
+				//var qrcode = new QRCode(document.getElementById("qrcode"), {
+					//text: codeString,
+					//logo: "/assets/zcash.png",
+					//logoWidth: 80,
+					//logoHeight: 80
+				//});
+			//} else {
+				//console.log(localStorage.getItem('s4z_token'));
+			//}
+		//});
+	}
+
+	ngOnDestroy(){
+		this.FullnodeSub.unsubscribe();
+		this.UserSub.unsubscribe();
+	}
+}
--- a/src/app/posts/post-create/post-create.component.css
+++ b/src/app/posts/post-create/post-create.component.css
@ -0,0 +1,4 @@
+mat-form-field,
+textarea{
+	width:100%;
+}
--- a/src/app/posts/post-create/post-create.component.html
+++ b/src/app/posts/post-create/post-create.component.html
@ -0,0 +1,13 @@
+<mat-card>
+	<form (submit)="onAddPost(postForm)" #postForm="ngForm">
+	<mat-form-field>
+		<input matInput type="text" name="enteredTitle" ngModel required #enteredTitle="ngModel">
+		<mat-error *ngIf="enteredTitle.invalid">This field is required</mat-error>
+	</mat-form-field>
+	<mat-form-field>
+		<textarea matInput rows="6" name="enteredContent" ngModel required #enteredContent="ngModel"></textarea>
+		<mat-error *ngIf="enteredContent.invalid">This field is required</mat-error>
+	</mat-form-field>
+	<button mat-raised-button color="primary" type="submit" >Save Post</button>
+	</form>
+</mat-card>
--- a/src/app/posts/post-create/post-create.component.ts
+++ b/src/app/posts/post-create/post-create.component.ts
@ -0,0 +1,34 @@
+import {Component, EventEmitter, Output} from '@angular/core';
+import { Post } from '../post.model';
+import { NgForm } from '@angular/forms';
+import { PostService } from '../posts.service';
+
+@Component({
+	selector: 'app-post-create',
+	templateUrl: './post-create.component.html',
+	styleUrls: ['./post-create.component.css']
+})
+
+export class PostCreateComponent {
+
+	enteredTitle = '';
+	enteredContent = '';
+	constructor(public postsService: PostService){}
+
+	//@Output() postCreated = new EventEmitter<Post>();
+	onAddPost(form: NgForm) {
+		//console.log(this.enteredTitle);
+		//console.log(this.enteredContent);
+		if (form.invalid) {
+			return;
+		}
+		const post: Post = {
+			id: '',
+			title: form.value.enteredTitle,
+			content: form.value.enteredContent
+		};
+		//console.log("Pressed the button!");
+		//this.postCreated.emit(post);
+		this.postsService.addPost(form.value.enteredTitle, form.value.enteredContent);
+	}
+}
--- a/src/app/posts/post-list/post-list.component.css
+++ b/src/app/posts/post-list/post-list.component.css
@ -0,0 +1,8 @@
+:host{
+	Display: block;
+	margin-top: 1rem;
+}
+
+.info-text{
+	text-align: center;
+}
--- a/src/app/posts/post-list/post-list.component.html
+++ b/src/app/posts/post-list/post-list.component.html
@ -0,0 +1,9 @@
+<mat-accordion *ngIf = "posts.length > 0">
+	<mat-expansion-panel *ngFor="let post of posts">
+		<mat-expansion-panel-header>
+			{{post.title}}
+		</mat-expansion-panel-header>
+		<p>{{post.content}}</p>
+	</mat-expansion-panel>
+</mat-accordion>
+<p class = "info-text mat-body-1" *ngIf = "posts.length <= 0">No posts!</p>
--- a/src/app/posts/post-list/post-list.component.ts
+++ b/src/app/posts/post-list/post-list.component.ts
@ -0,0 +1,36 @@
+import { Component, Input, OnInit, OnDestroy } from '@angular/core';
+import { Post } from '../post.model';
+import { PostService } from '../posts.service';
+import { Subscription } from 'rxjs';
+
+@Component({
+	selector: 'app-post-list',
+	templateUrl: './post-list.component.html',
+	styleUrls: ['./post-list.component.css']
+})
+
+
+export class PostListComponent implements OnInit, OnDestroy {
+	//posts=[  
+		//{title: 'First Post', content:'This is the first post\'s content'},  
+		//{title: 'Second Post', content:'This is the second post\'s content'},  
+		//{title: 'Third Post', content:'This is the third post\'s content'}    
+	//];  
+	posts: Post[] = [];
+	private PostSub: Subscription = new Subscription();
+	constructor(public postsService: PostService){
+		//this.postsService = postsService;
+	}
+
+	ngOnInit(){
+		this.postsService.getPosts();
+		this.PostSub=this.postsService.getPostUpdateListener().
+			subscribe((posts: Post[]) => {
+			this.posts = posts;
+		});
+	}
+
+	ngOnDestroy(){
+		this.PostSub.unsubscribe();
+	}
+}
--- a/src/app/posts/post.model.ts
+++ b/src/app/posts/post.model.ts
@ -0,0 +1,5 @@
+export interface Post {
+	id: string;
+	title: string;
+	content: string;
+}
--- a/src/app/posts/posts.service.ts
+++ b/src/app/posts/posts.service.ts
@ -0,0 +1,35 @@
+import {Post} from './post.model';
+import {Injectable} from '@angular/core';
+import {Subject} from 'rxjs';
+import {HttpClient} from '@angular/common/http';
+
+@Injectable({providedIn: 'root'})
+export class PostService{
+	private posts: Post[] = [];
+	private postUpdated = new Subject<Post[]>();
+
+	constructor(private http: HttpClient){
+	}
+
+	getPosts(){
+		this.http.get<{message: string, posts: Post[]}>('http://localhost:3000/api/posts')
+		.subscribe((PostData) => {
+			this.posts = PostData.posts;
+			this.postUpdated.next([...this.posts]);
+		});
+	}
+
+	addPost(title: string, content: string){
+		const post: Post={id: '', title: title, content: content};
+		this.http.post<{message: string}>('http://localhost:3000/api/posts', post).
+		subscribe((responseData) => {
+			console.log(responseData.message);
+			this.posts.push(post);
+			this.postUpdated.next([...this.posts]);
+		});
+	}
+
+	getPostUpdateListener() {
+		return this.postUpdated;
+	}
+}
--- a/src/app/user.model.ts
+++ b/src/app/user.model.ts
@ -0,0 +1,6 @@
+export interface User {
+	_id: string;
+	address: string;
+	session: string;
+	blocktime: number;
+}
--- a/src/app/user.service.ts
+++ b/src/app/user.service.ts
@ -0,0 +1,42 @@
+import {Injectable} from '@angular/core';
+import {Subject} from 'rxjs';
+import {HttpClient, HttpParams} from '@angular/common/http';
+import {User} from './user.model';
+
+@Injectable({providedIn: 'root'})
+
+export class UserService{
+	private uZaddr = '';
+	private uZaddrUpdated = new Subject<string>();
+
+	constructor(private http: HttpClient){
+	}
+	
+	addUser(address: string, session: string, blocktime: number) {
+		const user: User={_id: '', address: address, session: session, blocktime: blocktime};
+		this.http.post<{message: string}>('http://localhost:3000/api/users', user).
+		subscribe((responseData) => {
+			console.log(responseData.message);
+		});
+	}
+
+	getUser(session: string) {
+		const params = new HttpParams().append('session', session);
+		this.http.get<{message: string, user: any}>('http://localhost:3000/api/getuser', { headers:{}, params: params, observe: 'response'}).
+		subscribe((UserDataResponse) => {
+			console.log(UserDataResponse.status);
+			if (UserDataResponse.status == 200){
+				this.uZaddr = UserDataResponse.body!.user[0].address;
+				this.uZaddrUpdated.next(this.uZaddr);
+			} else {
+				this.uZaddrUpdated.next('');
+			}
+		});
+
+	}
+
+	getZaddrUpdateListener() {
+		return this.uZaddrUpdated;
+	}
+
+}
--- a/src/app/viewer/viewer.component.css
+++ b/src/app/viewer/viewer.component.css
@ -0,0 +1,3 @@
+* {
+	font-family: 'Roboto Mono', monospace;
+}
--- a/src/app/viewer/viewer.component.html
+++ b/src/app/viewer/viewer.component.html
@ -0,0 +1,27 @@
+<br>
+<div align="center">
+	<h1>Welcome to Sell4ZEC!</h1>
+</div>
+<table>
+	<colgroup>
+		<col span="1" style="width: 75%;">
+		<col span="1" style="width: 25%;">
+	</colgroup>
+	<tr>
+		<td>
+			<p>A non-custodial point-of-sale application, powered by Zcash.</p>
+		</td>
+		<td>
+			<div align="center" id="info">
+				<p>
+					Ensure you include your Reply-To shielded address!
+				</p>
+				<p>
+					Your shielded address is your username and all payments will be sent to it.
+				</p>
+			</div>
+			<br>
+			<div align="center" id="qrcode"></div>
+		</td>
+	</tr>
+</table>
--- a/src/app/viewer/viewer.component.ts
+++ b/src/app/viewer/viewer.component.ts
@ -0,0 +1,100 @@
+import { Component, OnInit, OnDestroy, Injectable } from '@angular/core';
+import { CanActivate, Router, RouterStateSnapshot, ActivatedRouteSnapshot } from '@angular/router';
+import { UserService } from '../user.service';
+import { FullnodeService } from '../fullnode.service';
+import { Subscription } from 'rxjs';
+import { v4 as uuidv4 } from 'uuid';
+var QRCode = require('easyqrcodejs');
+var URLSafeBase64 = require('urlsafe-base64');
+var Buffer = require('buffer/').Buffer;
+
+
+@Component({
+	selector: 'app-viewer',
+	templateUrl: './viewer.component.html',
+	styleUrls: ['./viewer.component.css']
+})
+
+export class ViewerComponent implements OnInit {
+	memos: string[] = [];
+	private FullnodeSub: Subscription = new Subscription();
+	private UserSub: Subscription = new Subscription();
+	constructor(
+		public fullnodeService: FullnodeService,
+		private router: Router,
+		public userService: UserService
+	){
+	}
+
+	ngOnInit(){
+		this.fullnodeService.getMemos();
+		this.fullnodeService.getAddr();
+		this.FullnodeSub = this.fullnodeService.getAddrUpdateListener().
+			subscribe((addr: string) => {
+			var localToken = localStorage.getItem('s4z_token');
+			console.log(localToken);
+			if(localToken == null){
+				var token = uuidv4();
+				localStorage.setItem('s4z_token', token);
+				console.log('Showing QR code for login');
+				console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token))));
+				var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token)))}`;
+				console.log(codeString);
+				var qrcode = new QRCode(document.getElementById("qrcode"), {
+					text: codeString,
+					logo: "/assets/zcash.png",
+					logoWidth: 80,
+					logoHeight: 80
+				});
+			} else {
+				this.userService.getUser(localToken);
+				this.userService.getZaddrUpdateListener().
+					subscribe((userAddr: string) => {
+					if (userAddr != '') {
+						console.log('Log in found!');
+						this.router.navigate(['/create']);
+					} else {
+						console.log('No login for token found');
+						console.log('Showing QR code for login');
+						//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken))));
+						var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(localToken!)))}`;
+						console.log(codeString);
+						var qrcode = new QRCode(document.getElementById("qrcode"), {
+							text: codeString,
+							logo: "/assets/zcash.png",
+							logoWidth: 80,
+							logoHeight: 80
+						});
+
+					}
+				});
+			}
+		});
+		//this.FullnodeSub=this.fullnodeService.getMemoUpdateListener().
+			//subscribe((memos: string[]) => {
+			//this.memos = memos;
+			//var addr = this.fullnodeService.getAddr();
+			//if(localStorage.getItem('s4z_token') == null){
+				//var token = uuidv4();
+				//localStorage.setItem('s4z_token', token);
+				//console.log('Showing QR code for login');
+				//console.log(URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token))));
+				//var codeString = `zcash:${addr}?amount=0.001&memo=${URLSafeBase64.encode(Buffer.from('S4ZEC::'.concat(token)))}`;
+				//console.log(codeString);
+				//var qrcode = new QRCode(document.getElementById("qrcode"), {
+					//text: codeString,
+					//logo: "/assets/zcash.png",
+					//logoWidth: 80,
+					//logoHeight: 80
+				//});
+			//} else {
+				//console.log(localStorage.getItem('s4z_token'));
+			//}
+		//});
+	}
+
+	ngOnDestroy(){
+		this.FullnodeSub.unsubscribe();
+		this.UserSub.unsubscribe();
+	}
+}
--- a/src/assets/zcash.jpg
+++ b/src/assets/zcash.jpg
--- a/src/assets/zcash.png
+++ b/src/assets/zcash.png
--- a/src/index.html
+++ b/src/index.html
@ -6,6 +6,9 @@
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="preconnect" href="https://fonts.gstatic.com">
+ <link href="https://fonts.googleapis.com/css2?family=Roboto+Mono:wght@300&display=swap" rel="stylesheet">
+ <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
 </head>
 <body>
  <app-root></app-root>
--- a/src/styles.css
+++ b/src/styles.css
@ -1 +1,5 @@
 /* You can add global styles to this file, and also import other style files */
+
+@import '@angular/material/prebuilt-themes/indigo-pink.css';
+html, body { height: 100%; }
+body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }
--- a/tsconfig.app.json
+++ b/tsconfig.app.json
@ -3,7 +3,7 @@
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./out-tsc/app",
-    "types": []
+    "types": ["node"]
  },
  "files": [
    "src/main.ts",