package-lock.json

@@ -1095,6 +1095,12 @@
         "to-fast-properties": "^2.0.0"
       }
     },
+    "@popperjs/core": {
+      "version": "2.5.3",
+      "resolved": "https://registry.npmjs.org/@popperjs/core/-/core-2.5.3.tgz",
+      "integrity": "sha512-RFwCobxsvZ6j7twS7dHIZQZituMIDJJNHS/qY6iuthVebxS3zhRY+jaC2roEKiAYaVuTcGmX6Luc6YBcf6zJVg==",
+      "dev": true
+    },
     "@types/color-name": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
@@ -3832,6 +3838,15 @@
         "process": "~0.11.0"
       }
     },
+    "tippy.js": {
+      "version": "6.2.7",
+      "resolved": "https://registry.npmjs.org/tippy.js/-/tippy.js-6.2.7.tgz",
+      "integrity": "sha512-k+kWF9AJz5xLQHBi3K/XlmJiyu+p9gsCyc5qZhxxGaJWIW8SMjw1R+C7saUnP33IM8gUhDA2xX//ejRSwqR0tA==",
+      "dev": true,
+      "requires": {
+        "@popperjs/core": "^2.4.4"
+      }
+    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",

package.json

@@ -21,6 +21,7 @@
     "jshint": "^2.12.0",
     "node-fetch": "^2.6.0",
     "pug": "^3.0.0",
-    "sass": "^1.26.10"
+    "sass": "^1.26.10",
+    "tippy.js": "^6.2.7"
   }
 }

src/js/login.js

@@ -1,36 +1,78 @@
+const tippy = require("tippy.js");
 const {q, ElemJS, ejs} = require("./basic.js")
+const {S_RE_DOMAIN, S_RE_IPV6, S_RE_IPV4} = require("./re.js")
 
 const password = q("#password")
-const homeserver = q("#homeserver")
+
+// A regex matching a lossy MXID
+// Groups:
+//  1: username/localpart
+//	MAYBE WITH
+//  2: hostname/serverpart
+//		3: domain
+//		OR
+//		4: IP address
+// 			5: IPv4 address
+//			OR
+//			6: IPv6 address
+//		MAYBE WITH
+//		7: port number
+const RE_LOSSY_MXID = new RegExp(`^@?([a-z0-9._=-]+?)(?::((?:(${S_RE_DOMAIN})|((${S_RE_IPV4})|(\\[${S_RE_IPV6}])))(?::(\\d+))?))?$`)
+
+window.RE_LOSSY_MXID = RE_LOSSY_MXID
 
 class Username extends ElemJS {
-	constructor() {
+	constructor(homeserver) {
 		super(q("#username"))
 
+		this.homeserver = homeserver;
+
 		this.on("change", this.updateServer.bind(this))
 	}
 
 	isValid() {
-		return !!this.element.value.match(/^@?[a-z0-9._=\/-]+(?::[a-zA-Z0-9.:\[\]-]+)?$/)
+		return !!this.element.value.match(RE_LOSSY_MXID)
 	}
 
 	getUsername() {
-		return this.element.value.match(/^@?([a-z0-9._=\/-]+)/)[1]
+		return this.element.value.match(RE_LOSSY_MXID)[1]
 	}
 
 	getServer() {
-		const server = this.element.value.match(/^@?[a-z0-9._=\?-]+:([a-zA-Z0-9.:\[\]-]+)$/)
+		const server = this.element.value.match(RE_LOSSY_MXID)
-		if (server && server[1]) return server[1]
+		if (server && server[2]) return server[2]
 		else return null
 	}
 
 	updateServer() {
 		if (!this.isValid()) return
-		if (this.getServer()) homeserver.value = this.getServer()
+		if (this.getServer()) this.homeserver.suggest(this.getServer())
 	}
 }
 
-const username = new Username()
+class Homeserver extends ElemJS {
+	constructor() {
+		super(q("#homeserver"));
+
+		this.tippy = tippy.default(q(".homeserver-question"), {
+			content: q("#homeserver-popup-template").innerHTML,
+			allowHTML: true,
+			interactive: true,
+			interactiveBorder: 10,
+			trigger: "focus mouseenter",
+			theme: "carbon",
+			arrow: tippy.roundArrow,
+		})
+	}
+
+	suggest(value) {
+		this.element.placeholder = value
+	}
+
+	getServer() {
+		return this.element.value || this.element.placeholder;
+	}
+}
 
 class Feedback extends ElemJS {
 	constructor() {
@@ -54,19 +96,20 @@ class Feedback extends ElemJS {
 		this.removeClass("form-feedback")
 		this.removeClass("form-error")
 		if (content) this.class("form-feedback")
-		if(isError) this.class("form-error")
+		if (isError) this.class("form-error")
 
 		this.messageSpan.text(content)
 	}
 }
 
-const feedback = new Feedback()
-
 class Form extends ElemJS {
-	constructor() {
+	constructor(username, feedback, homeserver) {
 		super(q("#form"))
 
 		this.processing = false
+		this.username = username
+		this.feedback = feedback
+		this.homeserver = homeserver
 
 		this.on("submit", this.submit.bind(this))
 	}
@@ -74,13 +117,13 @@ class Form extends ElemJS {
 	async submit() {
 		if (this.processing) return
 		this.processing = true
-		if (!username.isValid()) return this.cancel("Username is not valid.")
+		if (!this.username.isValid()) return this.cancel("Username is not valid.")
 
 		// Resolve homeserver address
 		let domain
 		try {
-			domain = await this.findHomeserver(homeserver.value)
+			domain = await this.findHomeserver(this.homeserver.getServer())
-		} catch(e) {
+		} catch (e) {
 			return this.cancel(e.message)
 		}
 
@@ -90,7 +133,7 @@ class Form extends ElemJS {
 			method: "POST",
 			body: JSON.stringify({
 				type: "m.login.password",
-				user: username.getUsername(),
+				user: this.username.getUsername(),
 				password: password.value
 			})
 		}).then(res => res.json())
@@ -134,11 +177,11 @@ class Form extends ElemJS {
 				const versions = await versionsReq.json()
 				if (Array.isArray(versions.versions)) return address
 			}
-		} catch(e) {}
+		} catch (e) {}
 
 		// Find the next matrix server in the chain
 		const root = await fetch(`${address}/.well-known/matrix/client`).then(res => res.json()).catch(e => {
- 			console.error(e)
+			console.error(e)
 			throw new Error(`Failed to look up server ${address}`)
 		})
 
@@ -153,15 +196,21 @@ class Form extends ElemJS {
 	}
 
 	status(message) {
-		feedback.setLoading(true)
+		this.feedback.setLoading(true)
-		feedback.message(message)
+		this.feedback.message(message)
 	}
 
 	cancel(message) {
 		this.processing = false
-		feedback.setLoading(false)
+		this.feedback.setLoading(false)
-		feedback.message(message, true)
+		this.feedback.message(message, true)
 	}
 }
 
-const form = new Form()
+const homeserver = new Homeserver()
+
+const username = new Username(homeserver)
+
+const feedback = new Feedback()
+
+const form = new Form(username, feedback, homeserver)

src/js/re.js

@@ -0,0 +1,38 @@
+// A valid internet domain, according to https://stackoverflow.com/a/20046959 (cleaned)
+const S_RE_DOMAIN = "(?:[a-zA-Z]|[a-zA-Z][a-zA-Z]|[a-zA-Z]\\d|\\d[a-zA-Z]|[a-zA-Z0-9][a-zA-Z0-9-_]{1,61}[a-zA-Z0-9])\\.(?:[a-zA-Z]{2,6}|[a-zA-Z0-9-]{2,30}\\.[a-zA-Z]{2,3})"
+
+// A valid ipv4 address, one that doesn't check for valid numbers (e.g. not 999) and one that does
+// const S_RE_IPV4_NO_CHECK = "(?:(?:\\d{1,3}\\.){3}\\d{1,3})"
+const S_RE_IPV4_HAS_CHECK = "(?:(?:25[0-5]|(?:2[0-4]|1{0,1}\\d){0,1}\\d)\\.){3}(?:25[0-5]|(?:2[0-4]|1{0,1}\\d){0,1}\\d)"
+
+const S_RE_IPV6_SEG = "[a-fA-F\\d]{1,4}"
+// Yes, this is an ipv6 address.
+const S_RE_IPV6 = `
+(?:
+(?:${S_RE_IPV6_SEG}:){7}(?:${S_RE_IPV6_SEG}|:)|
+(?:${S_RE_IPV6_SEG}:){6}(?:${S_RE_IPV4_HAS_CHECK}|:${S_RE_IPV6_SEG}|:)|
+(?:${S_RE_IPV6_SEG}:){5}(?::${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,2}|:)|
+(?:${S_RE_IPV6_SEG}:){4}(?:(?::${S_RE_IPV6_SEG}){0,1}:${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,3}|:)|
+(?:${S_RE_IPV6_SEG}:){3}(?:(?::${S_RE_IPV6_SEG}){0,2}:${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,4}|:)|
+(?:${S_RE_IPV6_SEG}:){2}(?:(?::${S_RE_IPV6_SEG}){0,3}:${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,5}|:)|
+(?:${S_RE_IPV6_SEG}:){1}(?:(?::${S_RE_IPV6_SEG}){0,4}:${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,6}|:)|
+(?::(?:(?::${S_RE_IPV6_SEG}){0,5}:${S_RE_IPV4_HAS_CHECK}|(?::${S_RE_IPV6_SEG}){1,7}|:))
+)(?:%[0-9a-zA-Z]{1,})?`
+  .replace(/\s*\/\/.*$/gm, '')
+  .replace(/\n/g, '')
+  .trim();
+
+const RE_DOMAIN_EXACT = new RegExp(`^${S_RE_DOMAIN}$`)
+const RE_IPV4_EXACT = new RegExp(`^${S_RE_IPV4_HAS_CHECK}$`)
+const RE_IPV6_EXACT = new RegExp(`^${S_RE_IPV6}$`)
+const RE_IP_ADDR_EXACT = new RegExp(`^${S_RE_IPV6}|${S_RE_IPV4_HAS_CHECK}$`)
+
+module.exports = {
+  S_RE_DOMAIN,
+  S_RE_IPV6,
+  S_RE_IPV4: S_RE_IPV4_HAS_CHECK,
+  RE_DOMAIN_EXACT,
+  RE_IPV4_EXACT,
+  RE_IPV6_EXACT,
+  RE_IP_ADDR_EXACT
+}

src/login.pug

@@ -15,18 +15,28 @@ html
           .data-input
             .form-input-container
               label(for="username") Username
-              input(type="text" name="username" autocomplete="username" placeholder="@username:server.tld" pattern="^@?[a-z0-9._=/-]+(?::[a-zA-Z0-9.:\\[\\]-]+)?$" required)#username
+              input(type="text" name="username" autocomplete="username" placeholder="@username:server.com" pattern="^@?[a-z0-9._=/-]+(?::[a-zA-Z0-9.:\\[\\]-]+)?$" required)#username
 
             .form-input-container
               label(for="password") Password
               input(name="password" autocomplete="current-password" type="password" required)#password
 
             .form-input-container
-              label(for="homeserver") Homeserver
+              .homeserver-label
-              input(type="text" name="homeserver" value="matrix.org" placeholder="matrix.org" required)#homeserver
+                label(for="homeserver") Homeserver
+                span.homeserver-question(tabindex=0) (What's this?)
+              input(type="text" name="homeserver" placeholder="matrix.org")#homeserver
 
           #feedback
 
           .form-input-container
             input(type="submit" value="Log in")#submit
+    template#homeserver-popup-template
+        .homeserver-popup
+           p
+             | Homeserver is the place where your account lives.
+             | It's usually the website where you registered.
+           p
+             | Need help finding a homeserver? 
+             a(href='#')  Click here 
 

src/sass/login.sass

@@ -1,6 +1,7 @@
 @use "./base"
-@use "./loading.sass"
+@use "./loading"
-@use "./colors.sass" as c
+@use "./colors" as c
+@use "./tippy"
 
 
 .main
@@ -43,6 +44,39 @@
 .form-error
   color: red
 
+.homeserver-question
+  font-size: 0.8em
+
+.homeserver-label
+  display: flex
+  justify-content: space-between
+  align-items: flex-end
+
+.homeserver-popup
+  p 
+    margin: 0.2em
+  a
+    &, &:hover, &:active
+      color: white
+      text-decoration: none
+    &:hover
+      color: #f00 //Placeholder 
+
+
+
+@keyframes spin
+  0%
+    transform: rotate(0deg)
+  100%
+    transform: rotate(180deg)
+
+.loading-icon
+  display: inline-block
+  background-color: #ccc
+  width: 12px
+  height: 12px
+  margin-right: 6px
+  animation: spin 0.7s infinite
 
 input, button
   font-family: inherit
@@ -67,6 +101,7 @@ button, input[type="submit"]
   padding: 7px
 
   &:hover
+    cursor: pointer
     background-color: c.$milder
 
 label

src/sass/tippy.sass

@@ -0,0 +1,10 @@
+@use "../../node_modules/tippy.js/dist/tippy.css"
+@use "../../node_modules/tippy.js/dist/svg-arrow.css"
+@use "./colors.sass" as c
+
+.tippy-box[data-theme~="carbon"] 
+  background-color: c.$milder
+  border: 2px solid c.$divider 
+
+  .tippy-svg-arrow
+    fill: c.$milder