From 265d774b4f149f0fafe6f6e77b6e384967710c98 Mon Sep 17 00:00:00 2001
From: Cadence Ember <cadence@disroot.org>
Date: Wed, 21 Oct 2020 19:33:36 +1300
Subject: [PATCH] Some login functionality

---
 spec.js             |   5 ++
 src/js/login.js     | 114 ++++++++++++++++++++++++++++++++++++++++++++
 src/login.pug       |  13 ++---
 src/sass/login.sass |  31 +++++++-----
 4 files changed, 145 insertions(+), 18 deletions(-)
 create mode 100644 src/js/login.js

diff --git a/spec.js b/spec.js
index 600af14..a488e5e 100644
--- a/spec.js
+++ b/spec.js
@@ -84,6 +84,11 @@ module.exports = [
 		source: "/js/functions.js",
 		target: "/static/functions.js",
 	},
+	{
+		type: "js",
+		source: "/js/login.js",
+		target: "/static/login.js",
+	},
 	{
 		type: "file",
 		source: "/assets/fonts/whitney-500.woff",
diff --git a/src/js/login.js b/src/js/login.js
new file mode 100644
index 0000000..d3baf3a
--- /dev/null
+++ b/src/js/login.js
@@ -0,0 +1,114 @@
+import {q, ElemJS} from $to_relative "/js/basic.js"
+
+const password = q("#password")
+const homeserver = q("#homeserver")
+
+class Username extends ElemJS {
+	constructor() {
+		super(q("#username"))
+
+		this.on("change", this.updateServer.bind(this))
+	}
+
+	isValid() {
+		return !!this.element.value.match(/^@?[a-z0-9._=\/-]+(?::[a-zA-Z0-9.:\[\]-]+)?$/)
+	}
+
+	getUsername() {
+		return this.element.value.match(/^@?([a-z0-9._=\/-]+)/)[1]
+	}
+
+	getServer() {
+		const server = this.element.value.match(/^@?[a-z0-9._=\?-]+:([a-zA-Z0-9.:\[\]-]+)$/)
+		if (server && server[1]) return server[1]
+		else return null
+	}
+
+	updateServer() {
+		if (!this.isValid()) return
+		if (this.getServer()) homeserver.value = this.getServer()
+	}
+}
+
+const username = new Username()
+
+class Form extends ElemJS {
+	constructor() {
+		super(q("#form"))
+
+		this.processing = false
+
+		this.on("submit", this.submit.bind(this))
+	}
+
+	async submit() {
+		if (this.processing) return
+		this.processing = true
+		if (!username.isValid()) return this.cancel("Username is not valid.")
+
+		// Resolve homeserver address
+		let currentAddress = homeserver.value
+		let ok = false
+		while (!ok) {
+			if (!currentAddress.match(/^https?:\/\//)) currentAddress = "https://" + currentAddress
+			currentAddress = currentAddress.replace(/\/*$/, "")
+			this.status(`Looking up homeserver... trying ${currentAddress}`)
+			try {
+				// check if we found the actual matrix server
+				const exists = await fetch(`${currentAddress}/_matrix/client/r0`).then(res => res.json())
+				if (exists.errcode === "M_UNRECOGNIZED") {
+					ok = true
+					break
+				}
+				// find the next matrix server in the chain
+				const root = await fetch(`${currentAddress}/.well-known/matrix/client`).then(res => res.json())
+				let nextAddress = root["m.homeserver"].base_url
+				nextAddress = nextAddress.replace(/\/*$/, "")
+				if (currentAddress === nextAddress) {
+					ok = true
+				}
+				currentAddress = nextAddress
+			} catch (e) {
+				return this.cancel(`Failed to look up server ${currentAddress}`)
+			}
+		}
+
+		// Request access token
+		this.status("Logging in...")
+		const root = await fetch(`${currentAddress}/_matrix/client/r0/login`, {
+			method: "POST",
+			body: JSON.stringify({
+				type: "m.login.password",
+				user: username.getUsername(),
+				password: password.value
+			})
+		}).then(res => res.json())
+
+		if (!root.access_token) {
+			if (root.error) {
+				this.cancel(`Server said: ${root.error}`)
+			} else {
+				this.cancel("Login mysteriously failed.")
+				console.error(root)
+			}
+			return
+		}
+
+		localStorage.setItem("mx_user_id", root.user_id)
+		localStorage.setItem("domain", currentAddress)
+		localStorage.setItem("access_token", root.access_token)
+
+		location.assign("./")
+	}
+
+	status(message) {
+		//TODO: display the message
+	}
+
+	cancel(message) {
+		this.processing = false
+		//TODO: display the message
+	}
+}
+
+const form = new Form()
diff --git a/src/login.pug b/src/login.pug
index 13acefd..4e86f06 100644
--- a/src/login.pug
+++ b/src/login.pug
@@ -2,19 +2,20 @@ doctype html
 html
   head
     meta(charset="utf-8")
-    link(rel="stylesheet" type="text/css" href=getStatic("/sass/login.sass"))
     title Carbon
     meta(name="viewport" content="width=device-width, initial-scale=1")
+    link(rel="stylesheet" type="text/css" href=getStatic("/sass/login.sass"))
+    script(type="module" src=getStatic("/js/login.js"))
 
   body
     main.main
       .center-login-container
         h1 Welcome to the Matrix!
-        form.login-form
+        form.login-form(method="post" onsubmit="return false")#form
           .data-input
             .form-input-container
-              label(for="login") Username
-              input(type="text" name="login" autocomplete="username" required)#login
+              label(for="username") Username
+              input(type="text" name="username" autocomplete="username" placeholder="@username:server.tld" pattern="^@?[a-z0-9._=/-]+(?::[a-zA-Z0-9.:\\[\\]-]+)?$" required)#username
 
             .form-input-container
               label(for="password") Password
@@ -22,7 +23,7 @@ html
 
             .form-input-container
               label(for="homeserver") Homeserver
-              input(type="text" name="homeserver" value="matrix.org" required)#homeserver
+              input(type="text" name="homeserver" value="matrix.org" placeholder="matrix.org" required)#homeserver
 
           .form-input-container
-            input(type="submit" value="Login")
+            input(type="submit" value="Log in")#submit
diff --git a/src/sass/login.sass b/src/sass/login.sass
index 92f443f..77144bc 100644
--- a/src/sass/login.sass
+++ b/src/sass/login.sass
@@ -10,10 +10,10 @@
   flex-flow: column
   justify-content: center
   align-items: center
-  width: min(100vw, 30rem)
+  width: min(100vw, 450px)
   padding: max(1rem,3vw) 2rem
-  height: 27rem
-  box-shadow: -2px 2px 10px c.$darkest
+  margin: 8px
+  box-shadow: 0px 2px 10px c.$darkest
   background-color: c.$darker
   border-radius: 5px
 
@@ -34,23 +34,30 @@
   flex-direction: column
   margin: 1em 0
 
-input
+input, button
+  font-family: inherit
+  font-size: 17px
+  background-color: c.$mild
+  color: #eee
   width: 100%
-  height: 2.4rem
   border-radius: 5px
   box-sizing: border-box
-  transition: background-color 1s, border-color 1s
-  padding: 0px 1ch
+  transition: background-color 0.15s ease-out, border-color 0.15s ease-out
+  padding: 4px 9px
   border: 0px
 
 input[type="text"],input[type="password"]
   border: 3px solid transparent
   margin: 0.4em 0px
-  &:hover
-    border-color: c.$mild
 
-input[type="submit"]:hover
-    background-color: c.$mild
+  &:hover, &:focus
+    border-color: c.$milder
+
+button, input[type="submit"]
+  padding: 7px
+
+  &:hover
+    background-color: c.$milder
 
 label
-  font-size: 1.2em
+  font-size: 18px