commit 860fa8ad90d52838b46d6375f944f5b873865015
Author: Yiyao Yu <yuydevel@protonmail.com>
Date:   Sat Oct 26 21:42:25 2024 -0700

    Initial commit (Chrome PoC, tested on Vivaldi v7.0.3495.6)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9497551
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,243 @@
+# Created by https://www.toptal.com/developers/gitignore/api/node,vim,emacs,webstorm
+# Edit at https://www.toptal.com/developers/gitignore?templates=node,vim,emacs,webstorm
+
+### Emacs ###
+# -*- mode: gitignore; -*-
+*~
+\#*\#
+/.emacs.desktop
+/.emacs.desktop.lock
+*.elc
+auto-save-list
+tramp
+.\#*
+
+# Org-mode
+.org-id-locations
+*_archive
+
+# flymake-mode
+*_flymake.*
+
+# eshell files
+/eshell/history
+/eshell/lastdir
+
+# elpa packages
+/elpa/
+
+# reftex files
+*.rel
+
+# AUCTeX auto folder
+/auto/
+
+# cask packages
+.cask/
+dist/
+
+# Flycheck
+flycheck_*.el
+
+# server auth directory
+/server/
+
+# projectiles files
+.projectile
+
+# directory configuration
+.dir-locals.el
+
+# network security
+/network-security.data
+
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit
+
+### Vim ###
+# Swap
+[._]*.s[a-v][a-z]
+!*.svg  # comment out if you don't need vector files
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+
+# Session
+Session.vim
+Sessionx.vim
+
+# Temporary
+.netrwhist
+# Auto-generated tag files
+tags
+# Persistent undo
+[._]*.un~
+
+### WebStorm ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/
+
+# CMake
+cmake-build-*/
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# End of https://www.toptal.com/developers/gitignore/api/node,vim,emacs,webstorm
diff --git a/app.js b/app.js
new file mode 100644
index 0000000..88dcd8e
--- /dev/null
+++ b/app.js
@@ -0,0 +1,45 @@
+var createError = require('http-errors');
+var express = require('express');
+var path = require('path');
+var favicon = require('serve-favicon');
+var cookieParser = require('cookie-parser');
+var logger = require('morgan');
+
+var indexRouter = require('./routes/index');
+var keysRouter = require('./routes/keys');
+
+var app = express();
+
+// view engine setup
+app.set('views', path.join(__dirname, 'views'));
+app.set('view engine', 'pug');
+
+app.use(logger('dev'));
+app.use(express.json());
+app.use(express.urlencoded({ extended: false }));
+app.use(cookieParser());
+app.use(express.static(path.join(__dirname, 'public')));
+app.use(favicon(path.join(__dirname,'public', 'images', 'favicon.ico')));
+app.use('/js/socket.io', express.static(path.join(
+    __dirname, 'node_modules', 'socket.io','client-dist')));
+
+app.use('/', indexRouter);
+app.use('/keys', keysRouter);
+
+// catch 404 and forward to error handler
+app.use(function(req, res, next) {
+    next(createError(404));
+});
+
+// error handler
+app.use(function(err, req, res, next) {
+    // set locals, only providing error in development
+    res.locals.message = err.message;
+    res.locals.error = req.app.get('env') === 'development' ? err : {};
+
+    // render the error page
+    res.status(err.status || 500);
+    res.render('error');
+});
+
+module.exports = app;
diff --git a/bin/www b/bin/www
new file mode 100755
index 0000000..3dee5ce
--- /dev/null
+++ b/bin/www
@@ -0,0 +1,124 @@
+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('webrtc-poc:server');
+var http = require('http');
+var socketio = require('socket.io');
+var Turn = require('node-turn');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app);
+var io = socketio(server);
+
+/**
+ * Handle signaling events
+ */
+io.on('connection', socket => {
+    console.log('Socket connected:', socket.id, 'at',
+        socket.request.connection.remoteAddress);
+    socket.on('disconnect', () => {
+        console.log('Socket disconnected:', socket.id, 'at', socket.request.connection.remoteAddress)
+    });
+    // Broadcast the client's offer
+    socket.on('join-offer', offer => {
+        console.log('Broadcast join-offer event from', socket.id);
+        socket.broadcast.emit('join-offer', offer);
+    });
+    socket.on('join-answer', answer => {
+        let dstSocket = JSON.parse(answer).dst;
+        console.log('Relaying join-answer event from', socket.id, 'to', dstSocket);
+        io.sockets.sockets.get(dstSocket).emit('join-answer', answer);
+    });
+    socket.on('join', info => {
+        console.log('Broadcast join event from', socket.id);
+        socket.broadcast.emit('join', info);
+    });
+    socket.on('leave', id => {
+        socket.broadcast.emit('leave', id);
+    });
+});
+
+var turn_server = new Turn();
+turn_server.start();
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+    var port = parseInt(val, 10);
+
+    if (isNaN(port)) {
+        // named pipe
+        return val;
+    }
+
+    if (port >= 0) {
+        // port number
+        return port;
+    }
+
+    return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+    if (error.syscall !== 'listen') {
+        throw error;
+    }
+
+    var bind = typeof port === 'string'
+        ? 'Pipe ' + port
+        : 'Port ' + port;
+
+    // handle specific listen errors with friendly messages
+    switch (error.code) {
+        case 'EACCES':
+            console.error(bind + ' requires elevated privileges');
+            process.exit(1);
+            break;
+        case 'EADDRINUSE':
+            console.error(bind + ' is already in use');
+            process.exit(1);
+            break;
+        default:
+            throw error;
+    }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+    var addr = server.address();
+    var bind = typeof addr === 'string'
+        ? 'pipe ' + addr
+        : 'port ' + addr.port;
+    debug('Listening on ' + bind);
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e0bd40a
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1953 @@
+{
+  "name": "webrtc-poc",
+  "version": "0.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "webrtc-poc",
+      "version": "0.0.0",
+      "dependencies": {
+        "cookie-parser": "~1.4.4",
+        "debug": "~2.6.9",
+        "express": "~4.16.1",
+        "http-errors": "~1.6.3",
+        "morgan": "~1.9.1",
+        "node-turn": "^0.0.6",
+        "pug": "2.0.0-beta11",
+        "serve-favicon": "^2.5.0",
+        "socket.io": "^4.8.1"
+      }
+    },
+    "node_modules/@socket.io/component-emitter": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@socket.io/component-emitter/-/component-emitter-3.1.2.tgz",
+      "integrity": "sha512-9BCxFwvbGg/RsZK9tjXd8s4UcwR0MWeFQ1XEKIQVVvAGJyINdrqKMcTRyLoK8Rse1GjzLV9cwjWV1olXRWEXVA==",
+      "license": "MIT"
+    },
+    "node_modules/@types/babel-types": {
+      "version": "7.0.16",
+      "resolved": "https://registry.npmjs.org/@types/babel-types/-/babel-types-7.0.16.tgz",
+      "integrity": "sha512-5QXs9GBFTNTmilLlWBhnsprqpjfrotyrnzUdwDrywEL/DA4LuCWQT300BTOXA3Y9ngT9F2uvmCoIxI6z8DlJEA==",
+      "license": "MIT"
+    },
+    "node_modules/@types/babylon": {
+      "version": "6.16.9",
+      "resolved": "https://registry.npmjs.org/@types/babylon/-/babylon-6.16.9.tgz",
+      "integrity": "sha512-sEKyxMVEowhcr8WLfN0jJYe4gS4Z9KC2DGz0vqfC7+MXFbmvOF7jSjALC77thvAO2TLgFUPa9vDeOak+AcUrZA==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/babel-types": "*"
+      }
+    },
+    "node_modules/@types/cookie": {
+      "version": "0.4.1",
+      "resolved": "https://registry.npmjs.org/@types/cookie/-/cookie-0.4.1.tgz",
+      "integrity": "sha512-XW/Aa8APYr6jSVVA1y/DEIZX0/GMKLEVekNG727R8cs56ahETkRAy/3DR7+fJyh7oUgGwNQaRfXCun0+KbWY7Q==",
+      "license": "MIT"
+    },
+    "node_modules/@types/cors": {
+      "version": "2.8.17",
+      "resolved": "https://registry.npmjs.org/@types/cors/-/cors-2.8.17.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/node": {
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+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.8.1.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.19.8"
+      }
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+    "node_modules/accepts": {
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+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
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+      "engines": {
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+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
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+      "license": "MIT",
+      "bin": {
+        "acorn": "bin/acorn"
+      },
+      "engines": {
+        "node": ">=0.4.0"
+      }
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+    "node_modules/acorn-globals": {
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+      "license": "MIT",
+      "dependencies": {
+        "acorn": "^4.0.4"
+      }
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+    "node_modules/align-text": {
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+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "kind-of": "^3.0.2",
+        "longest": "^1.0.1",
+        "repeat-string": "^1.5.2"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha512-S2Hw0TtNkMJhIabBwIojKL9YHO5T0n5eNqWJ7Lrlel/zDbftQpxpapi8tZs3X1HWa+u+QeydGmzzNU0m09+Rcg==",
+      "license": "BSD-3-Clause OR MIT",
+      "engines": {
+        "node": ">=0.4.2"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "license": "MIT",
+      "dependencies": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "node_modules/array-flatten": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
+      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+      "license": "MIT"
+    },
+    "node_modules/asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
+      "license": "MIT"
+    },
+    "node_modules/babel-runtime": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+      "integrity": "sha512-ITKNuq2wKlW1fJg9sSW52eepoYgZBggvOAHC0u/CYu/qxQ9EVzThCgR69BnSXLHjy2f7SY5zaQ4yt7H9ZVxY2g==",
+      "license": "MIT",
+      "dependencies": {
+        "core-js": "^2.4.0",
+        "regenerator-runtime": "^0.11.0"
+      }
+    },
+    "node_modules/babel-types": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+      "integrity": "sha512-zhe3V/26rCWsEZK8kZN+HaQj5yQ1CilTObixFzKW1UWjqG7618Twz6YEsCnjfg5gBcJh02DrpCkS9h98ZqDY+g==",
+      "license": "MIT",
+      "dependencies": {
+        "babel-runtime": "^6.26.0",
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.4",
+        "to-fast-properties": "^1.0.3"
+      }
+    },
+    "node_modules/babylon": {
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+      "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
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+      "license": "MIT",
+      "bin": {
+        "babylon": "bin/babylon.js"
+      }
+    },
+    "node_modules/base64-js": {
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/base64id": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64id/-/base64id-2.0.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": "^4.5.0 || >= 5.9"
+      }
+    },
+    "node_modules/basic-auth": {
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+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "5.1.2"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/body-parser": {
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+      "license": "MIT",
+      "dependencies": {
+        "bytes": "3.0.0",
+        "content-type": "~1.0.4",
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "http-errors": "~1.6.3",
+        "iconv-lite": "0.4.23",
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+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/yargs": {
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+      "integrity": "sha512-QFzUah88GAGy9lyDKGBqZdkYApt63rCXYBGYnEP4xDJPXNqXXnBDACnbrXnViV6jRSqAePwrATi2i8mfYm4L1A==",
+      "license": "MIT",
+      "dependencies": {
+        "camelcase": "^1.0.2",
+        "cliui": "^2.1.0",
+        "decamelize": "^1.0.0",
+        "window-size": "0.1.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..57bea4d
--- /dev/null
+++ b/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "webrtc-poc",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "start": "node ./bin/www"
+  },
+  "dependencies": {
+    "cookie-parser": "~1.4.4",
+    "debug": "~2.6.9",
+    "express": "~4.16.1",
+    "http-errors": "~1.6.3",
+    "morgan": "~1.9.1",
+    "node-turn": "^0.0.6",
+    "pug": "2.0.0-beta11",
+    "serve-favicon": "^2.5.0",
+    "socket.io": "^4.8.1"
+  }
+}
diff --git a/public/css/style.css b/public/css/style.css
new file mode 100644
index 0000000..9453385
--- /dev/null
+++ b/public/css/style.css
@@ -0,0 +1,8 @@
+body {
+  padding: 50px;
+  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
+}
+
+a {
+  color: #00B7FF;
+}
diff --git a/public/images/favicon.ico b/public/images/favicon.ico
new file mode 100644
index 0000000..59c7691
Binary files /dev/null and b/public/images/favicon.ico differ
diff --git a/public/js/main.js b/public/js/main.js
new file mode 100644
index 0000000..789ee50
--- /dev/null
+++ b/public/js/main.js
@@ -0,0 +1,422 @@
+'use strict';
+
+// General Utilities
+function setButtonClickable(id, state) {
+    document.getElementById(id).disabled = !state;
+}
+
+function registerButtonActions() {
+    document.getElementById('certLoad').onclick = onLoadCert;
+    document.getElementById('certSave').onclick = onSaveCert;
+    document.getElementById('certNew').onclick = onNewCert;
+    document.getElementById('certUpload').onclick = onUploadCert;
+    document.getElementById('certClear').onclick = onClearCert;
+    document.getElementById('chatJoin').onclick = onJoinChat;
+    document.getElementById('chatLeave').onclick = onLeaveChat;
+    document.getElementById('chatPost').onclick = onPostChat;
+    document.getElementById('chatInput').onkeydown = event => {
+        if (document.getElementById('chatPost').disabled)
+            return;
+        if (event.key === 'Enter') {
+            onPostChat();
+        }
+    };
+}
+
+// ========================== Certificate Management ==========================
+let certDB = null;
+let localCert = null;
+
+// Utilities
+function getCertificateChecksum(cert) {
+    let fp = cert.getFingerprints().reduce((res, curr) =>
+        curr.algorithm === 'sha-256' ? curr : res, null);
+    console.assert(fp !== null, 'Certificate does not have a sha256sum');
+    return fp.value.split(':').join('');
+}
+
+// IndexedDB
+function openCertDatabase(onSuccess, onError) {
+    let req = window.indexedDB.open('webrtc-poc', 1);
+    req.onupgradeneeded = () => {
+        console.log('Initializing new IndexedDB');
+        let db = req.result;
+        let certStore = db.createObjectStore('dtlsCerts', {keyPath: 'id'});
+        certStore.createIndex('by_id', 'id');
+    };
+    req.onsuccess = () => onSuccess(req.result);
+    req.onerror = () => onError(req.error);
+}
+
+function saveCertificate(db, cert, onSuccess, onError) {
+    let certTx = db.transaction('dtlsCerts', 'readwrite');
+    let certStore = certTx.objectStore('dtlsCerts');
+    let certPut = certStore.put({
+        // TODO: replace ID int with connection identifier
+        id: 0,
+        cert: cert,
+    });
+    certPut.onsuccess = onSuccess;
+    certPut.onerror = () => onError(certPut.error);
+}
+
+function loadCertificate(db, onSuccess, onError) {
+    let certTx = db.transaction('dtlsCerts', 'readonly');
+    let certStore = certTx.objectStore('dtlsCerts');
+    // TODO: replace ID int with connection identifier
+    let certGet = certStore.get(0)
+    certGet.onsuccess = () => {
+        let match = certGet.result;
+        if (match !== undefined) {
+            onSuccess(match.cert);
+        } else {
+            onSuccess(null);
+        }
+    };
+    certGet.onerror = () => onError(certGet.error);
+}
+
+// Cert Status Display
+function setCertStatusDisplay(status) {
+    document.getElementById('certStatus').innerText = status;
+}
+
+// Load Button
+function onLoadCert() {
+    console.assert(certDB !== null, 'IndexedDB not available');
+    loadCertificate(certDB,
+        cert => {
+            if (cert !== null) {
+                console.log('Loaded certificate:', getCertificateChecksum(cert));
+                console.log('Expires:', cert.expires);
+                localCert = cert;
+                setCertStatusDisplay('Loaded');
+                setButtonClickable('certUpload', true);
+                setButtonClickable('certClear', true);
+                setButtonClickable('certSave', true);
+                setButtonClickable('chatJoin', true);
+            } else {
+                setCertStatusDisplay('Load Failed (No Certificate Found)');
+            }
+        },
+        err => {
+            setCertStatusDisplay(`Load Failed (${err})`);
+        },
+    );
+
+}
+
+// Save Button
+function onSaveCert() {
+    console.assert(localCert !== null, 'No local certificate available');
+    console.assert(certDB !== null, 'IndexedDB not available');
+    saveCertificate(certDB, localCert,
+        () => {
+            setCertStatusDisplay('Saved');
+        },
+        err => {
+            setCertStatusDisplay(`Save Failed (${err})`);
+        },
+    );
+
+}
+
+// New Button
+function onNewCert() {
+    RTCPeerConnection.generateCertificate({
+        name: 'ECDSA',
+        hash: 'SHA-256',
+        namedCurve: 'P-256',
+    }).then(cert => {
+        console.log('Generated new certificate:', getCertificateChecksum(cert));
+        console.log('Expires:', cert.expires);
+        localCert = cert;
+        setCertStatusDisplay('Available');
+        setButtonClickable('certUpload', true);
+        setButtonClickable('certClear', true);
+        setButtonClickable('certSave', true);
+        setButtonClickable('chatJoin', true);
+    });
+}
+
+// Upload Button
+function onUploadCert() {
+    console.assert(localCert !== null, 'No local certificate available');
+    fetch('/keys', {
+        method: 'POST',
+        headers: {
+            'Accept': 'application/json',
+            'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+            'key': getCertificateChecksum(localCert),
+            'expires': localCert.expires,
+        }),
+    }).then(res => {
+        if (res.status === 200) {
+            setCertStatusDisplay('Uploaded');
+        } else {
+            res.json().then(res => {
+                setCertStatusDisplay(`Upload Failed (${res.status})`);
+            })
+        }
+    });
+}
+
+// Clear Button
+function onClearCert() {
+    console.assert(localCert !== null, 'No local certificate available');
+    let fp = getCertificateChecksum(localCert);
+    fetch(`/keys/${fp}`, {
+        method: 'DELETE',
+        headers: {
+            'Accept': 'application/json',
+            'Content-Type': 'application/json',
+        },
+    }).then(res => {
+        if (res.status === 200) {
+            setCertStatusDisplay('Cleared');
+            localCert = null;
+            setButtonClickable('certUpload', false);
+            setButtonClickable('certClear', false);
+            setButtonClickable('certSave', false);
+            setButtonClickable('chatJoin', false);
+        } else {
+            res.json().then(res => {
+                setCertStatusDisplay(`Delete Failed (${res.status})`);
+            })
+        }
+    });
+}
+
+// =============================== Chat Control ===============================
+let socket = null;
+let localDesc = null;
+let remoteDesc = null;
+let activeConnection = null;
+let activeChannel = null;
+let deferredCandidates = [];
+
+// Chat Status Display
+function setChatStatusDisplay(status) {
+    document.getElementById('chatStatus').innerText = status;
+}
+
+function getCertificateChecksumFromSDP(desc) {
+    let fp = desc.sdp.split('\n').reduce((res, curr) =>
+        curr.startsWith('a=fingerprint:sha-256 ') ? curr : res, null);
+    console.assert(fp !== null, 'Description does not have a sha256sum');
+    return fp.trim().split(' ')[1].split(':').join('').toLowerCase();
+}
+
+function verifyFingerprint(desc) {
+    let fp = getCertificateChecksumFromSDP(desc);
+    fetch(`/keys/${fp}`, {
+        method: 'GET',
+        headers: {
+            'Accept': 'application/json',
+            'Content-Type': 'application/json',
+        },
+    }).then(res => {
+        if (res.status !== 200) {
+            console.log('Unauthorized certificate detected! Terminating connection...');
+            res.json().then(res => setChatStatusDisplay(`Terminated (${res.status})`));
+            appendChatLog('SYSTEM', 'Terminating unauthorized session.');
+            onLeaveChat();
+        }
+    });
+}
+
+function onPeerOfferAvailable(msg) {
+    // Ignore subsequent requests
+    if (remoteDesc !== null) return;
+    console.log('Received WebRTC connection offer, sending answer...');
+
+    console.assert(localDesc !== null, 'No local description available');
+
+    activeChannel.close();
+    activeChannel = null;
+
+    remoteDesc = JSON.parse(msg);
+    verifyFingerprint(remoteDesc.desc);
+    activeConnection.setRemoteDescription(remoteDesc.desc).then(() =>
+        activeConnection.createAnswer().then(answer => {
+            localDesc = {src: socket.id, dst: remoteDesc.src, desc: answer};
+            activeConnection.setLocalDescription(localDesc.desc).then(() => {
+                socket.emit('join-answer', JSON.stringify(localDesc));
+                for (let candidate of deferredCandidates) {
+                    activeConnection.addIceCandidate(candidate);
+                }
+                deferredCandidates = []
+            })
+        })
+    );
+}
+
+function onPeerAnswerAvailable(msg) {
+    // Ignore subsequent responses
+    let currDesc = JSON.parse(msg);
+    if (remoteDesc !== null && currDesc.src !== remoteDesc.src) return;
+
+    console.log('Received WebRTC connection answer...');
+    console.assert(localDesc !== null, 'No local description available');
+
+    remoteDesc = currDesc;
+    verifyFingerprint(remoteDesc.desc);
+    activeConnection.setLocalDescription(localDesc.desc).then(() =>
+        activeConnection.setRemoteDescription(remoteDesc.desc).then(() => {
+            for (let candidate of deferredCandidates) {
+                activeConnection.addIceCandidate(candidate);
+            }
+            deferredCandidates = []
+        }));
+}
+
+function onPeerJoinAvailable(msg) {
+    let candidate = JSON.parse(msg);
+    if (candidate.src === remoteDesc.src && candidate.dst === localDesc.src) {
+        if (activeConnection.remoteDescription) {
+            console.log('Received WebRTC ICE candidate info, registering...');
+            activeConnection.addIceCandidate(candidate.candidate);
+        } else {
+            console.log('Received WebRTC ICE candidate info, deferring registration...');
+            deferredCandidates.push(candidate.candidate);
+        }
+    } else if (candidate.src === remoteDesc.src) {
+        onLeaveChat();
+        onJoinChat();
+    }
+}
+
+function onPeerAvailable(event) {
+    console.assert(remoteDesc !== null, 'No remote description available');
+    if (event.candidate) {
+        console.log('Sending WebRTC ICE candidate info...');
+        socket.emit('join', JSON.stringify( {
+            src: localDesc.src,
+            dst: remoteDesc.src,
+            candidate: event.candidate
+        }));
+    }
+}
+
+function registerChannelHandlers(channel) {
+    channel.addEventListener('open', () => {
+        setChatStatusDisplay('Connected');
+        appendChatLog('SYSTEM', 'User joined the chat.');
+        setButtonClickable('chatPost', true);
+        channel.addEventListener('close', () => {
+            appendChatLog('SYSTEM', 'User disconnected from the chat.');
+            onLeaveChat();
+        })
+    });
+    channel.addEventListener('message', event =>
+        appendChatLog('Remote', event.data));
+}
+
+function onRTCConnectionStateChange(event) {
+    let connection = event.target
+    let state = connection.connectionState;
+
+    console.log('WebRTC connection state update:', state);
+}
+
+// Join Button
+function onJoinChat() {
+    console.assert(localCert !== null, 'No local certificate available');
+    console.assert(activeConnection === null, 'Local connection exists');
+    console.assert(activeChannel === null, 'Local channel exists');
+
+    socket = io(window.location.protocol + '//' + window.location.host);
+    socket.on('join-offer', onPeerOfferAvailable);
+    socket.on('join-answer', onPeerAnswerAvailable);
+    socket.on('join', onPeerJoinAvailable);
+    socket.on('connect', () => {
+        let rtcCfg = {
+            iceServers: [{urls: `stun:${window.location.hostname}:3478`}],
+            certificates: [localCert],
+        };
+        activeConnection = new RTCPeerConnection(rtcCfg);
+        activeConnection.addEventListener('icecandidate', onPeerAvailable);
+        activeConnection.addEventListener('connectionstatechange', onRTCConnectionStateChange);
+        activeConnection.addEventListener('datachannel', event => {
+            console.assert(activeChannel === null);
+            activeChannel = event.channel;
+            registerChannelHandlers(activeChannel)
+        });
+        activeChannel = activeConnection.createDataChannel('chatChannel');
+        registerChannelHandlers(activeChannel);
+        activeConnection.createOffer().then(offer => {
+            localDesc = {src: socket.id, desc: offer};
+            // Broadcast join offer
+            console.log('Sending WebRTC connection offer...');
+            socket.emit('join-offer', JSON.stringify(localDesc));
+        })
+
+        setButtonClickable('chatJoin', false);
+        setButtonClickable('chatLeave', true);
+        setButtonClickable('certNew', false);
+        setButtonClickable('certLoad', false);
+        setButtonClickable('certClear', false);
+        setChatStatusDisplay('Awaiting connection');
+        clearChatLog();
+    });
+}
+
+// Leave Button
+function onLeaveChat() {
+    if (socket !== null) {
+        socket.disconnect();
+        socket = null;
+    }
+
+    if (activeChannel !== null) {
+        activeChannel.close();
+        activeChannel = null;
+    }
+
+    if (activeConnection !== null) {
+        activeConnection.close();
+        activeConnection = null;
+    }
+
+    localDesc = null;
+    remoteDesc = null;
+
+    setButtonClickable('chatJoin', true);
+    setButtonClickable('chatLeave', false);
+    setButtonClickable('certNew', true);
+    setButtonClickable('certLoad', true);
+    setButtonClickable('certClear', true);
+    setChatStatusDisplay('Disconnected');
+}
+
+// ================================= Chat Log =================================
+function clearChatLog() {
+    document.getElementById('chatLog').innerHTML = '';
+}
+
+function appendChatLog(name, msg) {
+    document.getElementById('chatLog').innerHTML += `<p>${name}: ${msg}</p>`;
+}
+
+// Post Button
+function onPostChat() {
+    let input = document.getElementById('chatInput');
+    let text = input.value;
+    appendChatLog('Local', text);
+    activeChannel.send(text);
+    input.value = '';
+}
+
+registerButtonActions();
+openCertDatabase(
+    db => {
+        console.assert(certDB === null, 'IndexedDB already open');
+        certDB = db;
+        console.log('IndexedDB opened.');
+        setButtonClickable('certNew', true);
+        setButtonClickable('certLoad', true);
+    },
+    err => console.error(`IndexedDB open error: ${err}`)
+);
\ No newline at end of file
diff --git a/routes/index.js b/routes/index.js
new file mode 100644
index 0000000..6a88ff4
--- /dev/null
+++ b/routes/index.js
@@ -0,0 +1,9 @@
+let express = require('express');
+let router = express.Router();
+
+/* GET home page. */
+router.get('/', function(req, res, next) {
+  res.render('index', { title: 'WebRTC Auth PoC' });
+});
+
+module.exports = router;
diff --git a/routes/keys.js b/routes/keys.js
new file mode 100644
index 0000000..965e23b
--- /dev/null
+++ b/routes/keys.js
@@ -0,0 +1,43 @@
+let express = require('express');
+let router = express.Router();
+let keymap = {}
+
+router.get('/:id', (req, res) => {
+    let key = req.params.id.toLowerCase();
+    if (key in keymap) {
+        if (keymap[key] < Date.now()) {
+            delete keymap[key];
+            res.status(403).json({status: 'Key Expired'});
+        } else {
+            res.json({status: 'OK'});
+        }
+    } else {
+        res.status(404).json({status: 'Not found'});
+    }
+});
+
+router.post('/', (req, res) => {
+    if (!('key' in req.body && 'expires' in req.body)) {
+        res.status(400).json({status: 'Bad Request'});
+    }
+    let key = req.body.key.toLowerCase();
+    let expires = req.body.expires;
+    if (key in keymap) {
+        res.status(400).json({status: 'Key exists'});
+    } else {
+        keymap[key] = expires
+        res.json({status: 'OK'});
+    }
+});
+
+router.delete('/:id', (req, res) => {
+    let key = req.params.id.toLowerCase();
+    if (key in keymap) {
+        delete keymap[key];
+        res.json({status: 'OK'});
+    } else {
+        res.status(404).json({status: 'Not found'});
+    }
+});
+
+module.exports = router;
\ No newline at end of file
diff --git a/views/error.pug b/views/error.pug
new file mode 100644
index 0000000..51ec12c
--- /dev/null
+++ b/views/error.pug
@@ -0,0 +1,6 @@
+extends layout
+
+block content
+  h1= message
+  h2= error.status
+  pre #{error.stack}
diff --git a/views/index.pug b/views/index.pug
new file mode 100644
index 0000000..fc30030
--- /dev/null
+++ b/views/index.pug
@@ -0,0 +1,25 @@
+extends layout
+
+block content
+  script(src='https://webrtc.github.io/adapter/adapter-latest.js' defer)
+  script(src='js/socket.io/socket.io.js' defer)
+  script(src='js/main.js' defer)
+  h1= title
+  h2 Certificate Status:#{' '}
+    span(id='certStatus') Unknown
+  div
+    button(id='certLoad' disabled=true) Load
+    button(id='certSave' disabled=true) Save
+    button(id='certNew' disabled=true) New
+    button(id='certUpload' disabled=true) Upload
+    button(id='certClear' disabled=true) Clear
+  h2 Chat Status:#{' '}
+    span(id='chatStatus') Disconnected
+  div
+    button(id='chatJoin' disabled=true) Join
+    button(id='chatLeave' disabled=true) Leave
+  h2 Chat Log
+  div
+    input(id='chatInput')
+    button(id='chatPost' disabled=true) Post
+  div(id='chatLog')
diff --git a/views/layout.pug b/views/layout.pug
new file mode 100644
index 0000000..215cbc6
--- /dev/null
+++ b/views/layout.pug
@@ -0,0 +1,7 @@
+doctype html
+html
+  head
+    title= title
+    link(rel='stylesheet', href='/css/style.css')
+  body
+    block content