Ask for server URL before showing sign in box

Contact the server's .well-known API before anything to get
available login flows instead of blindly assuming it will be
m.login.password, and to get the server's real URL instead of
requiring users to remember that e.g. it's "chat.privacytools.io"
and not just "privacytools.io" despite user IDs making it look like so.

The server field will also now remember the last accepted URL.

TODO.md

@@ -1,7 +1,11 @@
 # TODO
 
-- Image viewer: 
+- fallback page
-    - hflickable: support kinetic scrolling disabler 
+- SSO page
+- sever list
+- cursor shape in HBox/HTabbedBox pages over fields
+- login with account already added → infinite spinner in room list
+- verify onKeyboardAccept/Cancel things respect button enabled state
 
 - global presence control
 

src/backend/backend.py

@@ -6,14 +6,14 @@ import os
 import sys
 import traceback
 from pathlib import Path
-from typing import Any, DefaultDict, Dict, List, Optional
+from typing import Any, DefaultDict, Dict, List, Optional, Tuple
 
 from appdirs import AppDirs
 
 import nio
 
 from . import __app_name__
-from .errors import MatrixError
+from .errors import MatrixError, MatrixForbidden, MatrixNotFound
 from .matrix_client import MatrixClient
 from .media_cache import MediaCache
 from .models import SyncId
@@ -129,6 +129,30 @@ class Backend:
 
     # Clients management
 
+    async def server_info(self, homeserver: str) -> Tuple[str, List[str]]:
+        """Return server's real URL and supported login flows.
+
+        Retrieving the real URL uses the `.well-known` API.
+        Possible login methods include `m.login.password` or `m.login.sso`.
+        """
+
+        client = MatrixClient(self, homeserver=homeserver)
+
+        try:
+            homeserver = (await client.discovery_info()).homeserver_url
+        except (MatrixNotFound, MatrixForbidden):
+            # This is either already the real URL, or an invalid URL.
+            pass
+        else:
+            await client.close()
+            client = MatrixClient(self, homeserver=homeserver)
+
+        try:
+            return (homeserver, (await client.login_info()).flows)
+        finally:
+            await client.close()
+
+
     async def login_client(self,
         user:       str,
         password:   str,

src/backend/matrix_client.py

@@ -152,11 +152,13 @@ class MatrixClient(nio.AsyncClient):
     }
 
 
-    def __init__(self,
+    def __init__(
-                 backend,
+        self,
-                 user:       str,
+         backend,
-                 homeserver: str           = "https://matrix.org",
+         user:       str           = "",
-                 device_id:  Optional[str] = None) -> None:
+         homeserver: str           = "https://matrix.org",
+         device_id:  Optional[str] = None,
+    ) -> None:
 
         if not urlparse(homeserver).scheme:
             raise ValueError(

src/gui/Base/HBox.qml

@@ -5,7 +5,6 @@ import QtQuick.Layouts 1.12
 
 HFlickableColumnPage {
     implicitWidth: Math.min(parent.width, theme.controls.box.defaultWidth)
-    implicitHeight: Math.min(parent.height, flickable.contentHeight)
 
     background: Rectangle {
         color: theme.controls.box.background

src/gui/Base/HFlickableColumnPage.qml

@@ -18,6 +18,7 @@ HPage {
 
 
     implicitWidth: theme.controls.box.defaultWidth
+    implicitHeight: contentHeight + implicitHeaderHeight + implicitFooterHeight
     contentHeight:
         flickable.contentHeight + flickable.topMargin + flickable.bottomMargin
 

src/gui/Pages/AddAccount/AddAccount.qml

@@ -4,22 +4,48 @@ import QtQuick 2.12
 import QtQuick.Layouts 1.12
 import "../../Base"
 
-HPage {
+HSwipeView {
-    id: page
+    id: swipeView
+    clip: true
+    interactive: currentIndex !== 0 || signIn.serverUrl
+    onCurrentItemChanged: if (currentIndex === 0) serverBrowser.takeFocus()
+    Component.onCompleted: serverBrowser.takeFocus()
 
-    HTabbedBox {
+    HPage {
-        anchors.centerIn: parent
+        id: serverPage
-        width: Math.min(implicitWidth, page.availableWidth)
-        height: Math.min(implicitHeight, page.availableHeight)
 
-        header: HTabBar {
+        ServerBrowser {
-            HTabButton { text: qsTr("Sign in") }
+            id: serverBrowser
-            HTabButton { text: qsTr("Register") }
+            anchors.centerIn: parent
-            HTabButton { text: qsTr("Reset") }
+            width: Math.min(implicitWidth, serverPage.availableWidth)
+            height: Math.min(implicitHeight, serverPage.availableHeight)
+            onAccepted: swipeView.currentIndex = 1
         }
+    }
 
-        SignIn {}
+    HPage {
-        Register {}
+        id: tabPage
-        Reset {}
+
+        HTabbedBox {
+            anchors.centerIn: parent
+            width: Math.min(implicitWidth, tabPage.availableWidth)
+            height: Math.min(implicitHeight, tabPage.availableHeight)
+
+            header: HTabBar {
+                HTabButton { text: qsTr("Sign in") }
+                HTabButton { text: qsTr("Register") }
+                HTabButton { text: qsTr("Reset") }
+            }
+
+            SignIn {
+                id: signIn
+                serverUrl: serverBrowser.acceptedUrl
+                displayUrl: serverBrowser.acceptedUserUrl
+                onExitRequested: swipeView.currentIndex = 0
+            }
+
+            Register {}
+            Reset {}
+        }
     }
 }

src/gui/Pages/AddAccount/ServerBrowser.qml

@@ -0,0 +1,155 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+
+import QtQuick 2.12
+import QtQuick.Layouts 1.12
+import "../../Base"
+import "../../Base/Buttons"
+import "../../PythonBridge"
+
+HBox {
+    id: page
+
+    property string acceptedUserUrl: ""
+    property string acceptedUrl: ""
+    property var loginFlows: ["m.login.password"]
+
+    property string saveName: "serverBrowser"
+    property var saveProperties: ["acceptedUserUrl"]
+    property Future connectFuture: null
+
+    signal accepted()
+
+    function takeFocus() { serverField.item.forceActiveFocus() }
+
+    function connect() {
+        if (connectFuture) connectFuture.cancel()
+        connectTimeout.restart()
+
+        const args = [serverField.item.cleanText]
+
+        connectFuture = py.callCoro("server_info", args, ([url, flows]) => {
+            connectTimeout.stop()
+            errorMessage.text = ""
+
+            connectFuture   = null
+            acceptedUrl     = url
+            acceptedUserUrl = args[0]
+            loginFlows      = flows
+            accepted()
+
+        }, (type, args, error, traceback, uuid) => {
+            connectTimeout.stop()
+            connectFuture = null
+
+            let text = qsTr("Unexpected error: %1 [%2]").arg(type).arg(args)
+
+            type === "MatrixNotFound" ?
+            text = qsTr("Invalid homeserver address") :
+
+            type.startsWith("Matrix") ?
+            text = qsTr("Error contacting server: %1").arg(type) :
+
+            utils.showError(type, traceback, uuid)
+
+            errorMessage.text = text
+        })
+    }
+
+    function cancel() {
+        if (page.connectFuture) return
+
+        connectTimeout.stop()
+        connectFuture.cancel()
+        connectFuture = null
+    }
+
+
+    footer: AutoDirectionLayout {
+        ApplyButton {
+            id: applyButton
+            enabled: serverField.item.cleanText && ! serverField.item.error
+            text: qsTr("Connect")
+            icon.name: "server-connect"
+            loading: page.connectFuture !== null
+            disableWhileLoading: false
+            onClicked: page.connect()
+        }
+
+        CancelButton {
+            id: cancelButton
+            enabled: page.connectFuture !== null
+            onClicked: page.cancel()
+        }
+    }
+
+    onKeyboardAccept: if (applyButton.enabled) page.connect()
+    onKeyboardCancel: if (cancelButton.enabled) page.cancel()
+    onAccepted: window.saveState(this)
+
+    Timer {
+        id: connectTimeout
+        interval: 30 * 1000
+        onTriggered: {
+            errorMessage.text =
+                serverField.knownServerChosen ?
+
+                qsTr("This homeserver seems unavailable. Verify your inter" +
+                     "net connection or try again in a few minutes.") :
+
+                 qsTr("This homeserver seems unavailable. Verify the " +
+                      "entered address, your internet connection or try " +
+                      "again in a few minutes.")
+        }
+    }
+
+    HLabeledItem {
+        id: serverField
+
+        // 2019-11-11 https://www.hello-matrix.net/public_servers.php
+        readonly property var knownServers: [
+            "https://matrix.org",
+            "https://chat.weho.st",
+            "https://tchncs.de",
+            "https://chat.privacytools.io",
+            "https://hackerspaces.be",
+            "https://matrix.allmende.io",
+            "https://feneas.org",
+            "https://junta.pl",
+            "https://perthchat.org",
+            "https://matrix.tedomum.net",
+            "https://converser.eu",
+            "https://ru-matrix.org",
+            "https://matrix.sibnsk.net",
+            "https://alternanet.fr",
+        ]
+
+        readonly property bool knownServerChosen:
+            knownServers.includes(item.cleanText)
+
+        label.text: qsTr("Homeserver:")
+
+        Layout.fillWidth: true
+
+        HTextField {
+            readonly property string cleanText: text.toLowerCase().trim()
+
+            width: parent.width
+            error: ! /https?:\/\/.+/.test(cleanText)
+            defaultText:
+                window.getState(page, "acceptedUserUrl", "https://matrix.org")
+        }
+    }
+
+    HLabel {
+        id: errorMessage
+        wrapMode: HLabel.Wrap
+        horizontalAlignment: Text.AlignHCenter
+        color: theme.colors.errorText
+
+        visible: Layout.maximumHeight > 0
+        Layout.maximumHeight: text ? implicitHeight : 0
+        Behavior on Layout.maximumHeight { HNumberAnimation {} }
+
+        Layout.fillWidth: true
+    }
+}

src/gui/Pages/AddAccount/SignIn.qml

@@ -8,33 +8,42 @@ import "../../Base/Buttons"
 HFlickableColumnPage {
     id: page
 
+    enum Security { Insecure, LocalHttp, Secure }
+
+    property string serverUrl
+    property string displayUrl: serverUrl
     property var loginFuture: null
 
-    property string signInWith: "username"
+    signal exitRequested()
 
-    readonly property bool canSignIn:
+    readonly property int security:
-        serverField.item.text.trim() && idField.item.text.trim() &&
+        serverUrl.startsWith("https://") ?
-        passwordField.item.text && ! serverField.item.error
+        SignIn.Security.Secure :
+
+        ["//localhost", "//127.0.0.1", "//:1"].includes(
+            serverUrl.split(":")[1],
+        ) ?
+        SignIn.Security.LocalHttp :
+
+        SignIn.Security.Insecure
 
     function takeFocus() { idField.item.forceActiveFocus() }
 
     function signIn() {
         if (page.loginFuture) page.loginFuture.cancel()
 
-        signInTimeout.restart()
-
         errorMessage.text = ""
 
         const args = [
             idField.item.text.trim(), passwordField.item.text,
-            undefined, serverField.item.text.trim(),
+            undefined, page.serverUrl,
         ]
 
         page.loginFuture = py.callCoro("login_client", args, userId => {
-            signInTimeout.stop()
             errorMessage.text = ""
             page.loginFuture  = null
 
+            print(rememberAccount.checked)
             py.callCoro(
                 rememberAccount.checked ?
                 "saved_accounts.add": "saved_accounts.delete",
@@ -48,7 +57,6 @@ HFlickableColumnPage {
 
         }, (type, args, error, traceback, uuid) => {
             page.loginFuture = null
-            signInTimeout.stop()
 
             let txt = qsTr(
                 "Invalid request, login type or unknown error: %1",
@@ -67,17 +75,23 @@ HFlickableColumnPage {
     }
 
     function cancel() {
-        if (! page.loginFuture) return
+        if (! page.loginFuture) {
+            page.exitRequested()
+            return
+        }
 
-        signInTimeout.stop()
         page.loginFuture.cancel()
         page.loginFuture = null
     }
 
 
+    flickable.topMargin: theme.spacing * 1.5
+    flickable.bottomMargin: flickable.topMargin
+
     footer: AutoDirectionLayout {
         ApplyButton {
-            enabled: page.canSignIn
+            id: applyButton
+            enabled: idField.item.text.trim() && passwordField.item.text
             text: qsTr("Sign in")
             icon.name: "sign-in"
             loading: page.loginFuture !== null
@@ -90,54 +104,39 @@ HFlickableColumnPage {
         }
     }
 
-    onKeyboardAccept: page.signIn()
+    onKeyboardAccept: if (applyButton.enabled) page.signIn()
     onKeyboardCancel: page.cancel()
 
-    Timer {
+    HButton {
-        id: signInTimeout
+        icon.name: "sign-in-" + (
-        interval: 30 * 1000
+            page.security === SignIn.Security.Insecure ? "insecure" :
-        onTriggered: {
+            page.security === SignIn.Security.LocalHttp ? "local-http" :
-            errorMessage.text =
+            "secure"
-                serverField.knownServerChosen ?
+        )
 
-                qsTr("This server seems unavailable. Verify your inter" +
+        icon.color:
-                     "net connection or try again in a few minutes.") :
+            page.security === SignIn.Security.Insecure ?
+            theme.colors.negativeBackground :
 
-                 qsTr("This server seems unavailable. Verify the " +
+            page.security === SignIn.Security.LocalHttp ?
-                      "entered URL, your internet connection or try " +
+            theme.colors.middleBackground :
-                      "again in a few minutes.")
-        }
-    }
 
-    HRowLayout {
+            theme.colors.positiveBackground
-        visible: false  // TODO
-        spacing: theme.spacing * 1.25
-        Layout.alignment: Qt.AlignHCenter
 
-        Layout.topMargin: theme.spacing
+        text:
-        Layout.bottomMargin: Layout.topMargin
+            page.security === SignIn.Security.Insecure ?
+            page.serverUrl :
+            page.displayUrl.replace(/^(https?:\/\/)?(www\.)?/, "")
 
-        Repeater {
+        onClicked: page.exitRequested()
-            model: ["username", "email", "phone"]
 
-            HButton {
+        Layout.alignment: Qt.AlignCenter
-                icon.name: modelData
+        Layout.maximumWidth: parent.width
-                circle: true
-                checked: page.signInWith === modelData
-                enabled: modelData === "username"
-                autoExclusive: true
-                onClicked: page.signInWith = modelData
-            }
-        }
     }
 
     HLabeledItem {
         id: idField
-        label.text: qsTr(
+        label.text: qsTr("Username:")
-            page.signInWith === "email" ? "Email:" :
-            page.signInWith === "phone" ? "Phone:" :
-            "Username:"
-        )
 
         Layout.fillWidth: true
 
@@ -158,43 +157,6 @@ HFlickableColumnPage {
         }
     }
 
-    HLabeledItem {
-        id: serverField
-
-        // 2019-11-11 https://www.hello-matrix.net/public_servers.php
-        readonly property var knownServers: [
-            "https://matrix.org",
-            "https://chat.weho.st",
-            "https://tchncs.de",
-            "https://chat.privacytools.io",
-            "https://hackerspaces.be",
-            "https://matrix.allmende.io",
-            "https://feneas.org",
-            "https://junta.pl",
-            "https://perthchat.org",
-            "https://matrix.tedomum.net",
-            "https://converser.eu",
-            "https://ru-matrix.org",
-            "https://matrix.sibnsk.net",
-            "https://alternanet.fr",
-        ]
-
-        readonly property bool knownServerChosen:
-            knownServers.includes(item.cleanText)
-
-        label.text: qsTr("Homeserver:")
-
-        Layout.fillWidth: true
-
-        HTextField {
-            readonly property string cleanText: text.toLowerCase().trim()
-
-            width: parent.width
-            text: "https://matrix.org"
-            error: ! /.+:\/\/.+/.test(cleanText)
-        }
-    }
-
     HCheckBox {
         id: rememberAccount
         checked: true
@@ -206,7 +168,6 @@ HFlickableColumnPage {
 
         Layout.fillWidth: true
         Layout.topMargin: theme.spacing / 2
-        Layout.bottomMargin: Layout.topMargin
     }
 
     HLabel {

src/gui/Utils.qml

@@ -440,6 +440,7 @@ QtObject {
 
         flickable.maximumFlickVelocity = 5000
 
+
         flickable.flickDeceleration = Math.max(
             goFaster ? normalDecel : -Infinity,
             Math.abs(normalDecel * magicNumber * pages),

src/icons/thin/server-connect.svg

@@ -0,0 +1,3 @@
+<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="m12 0c-6.627 0-12 5.373-12 12s5.373 12 12 12 12-5.373 12-12-5.373-12-12-12zm5.73 20.183c-.106-.526-.236-1.046-.398-1.555.897-.811.86-2.197-.072-2.883.582-2.318.61-4.849-.002-7.288.186-.111.348-.254.475-.425 1.466.412 2.831 1.066 4.052 1.911.14.665.215 1.352.215 2.057 0 3.382-1.692 6.372-4.27 8.183zm-15.73-8.183c0-.855.12-1.682.323-2.475.699-.044 1.393-.04 2.147.032l.04.226c-.921.775-1.75 1.661-2.487 2.674zm3.183-1.19c.848.643 2.083.436 2.662-.49 2.898 1.06 5.339 3.077 6.94 5.666-.766.775-.756 1.998.019 2.695-.681 1.231-1.548 2.345-2.56 3.307-4.902.117-8.924-3.262-9.969-7.697.772-1.316 1.755-2.494 2.908-3.481zm2.886-1.901c1.991-.974 4.155-1.432 6.324-1.377.305.611.93 1.076 1.666 1.166h.006c.557 2.157.583 4.472.029 6.7l-.223.023c-1.724-2.825-4.433-5.131-7.763-6.301zm6.062 12.857c.702-.817 1.311-1.695 1.813-2.627l.27-.008c.172.562.308 1.139.408 1.729-.777.406-1.612.714-2.491.906zm7.103-13.598c-1.009-.56-2.076-1.002-3.189-1.311-.108-.995-1.041-1.824-2.119-1.816-.552-1.019-1.232-1.975-2.024-2.854 3.321.642 6.061 2.93 7.332 5.981zm-6.472-2.708c-.257.22-.443.515-.524.858-2.456-.03-4.778.526-6.848 1.565-.85-.638-2.07-.421-2.646.483-.728-.076-1.379-.092-2.024-.072 1.476-3.683 5.076-6.294 9.28-6.294h.001c1.097.994 2.034 2.16 2.761 3.46z"/>
+</svg>

src/icons/thin/sign-in-insecure.svg

@@ -0,0 +1,3 @@
+<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="m8 9v-3c0-2.206 1.794-4 4-4s4 1.794 4 4v3h2v-3c0-3.313-2.687-6-6-6s-6 2.687-6 6v3zm.746 2h2.831l-8.577 8.787v-2.9zm12.254 1.562v-1.562h-1.37l-12.69 13h2.894zm-6.844-1.562-11.156 11.431v1.569h1.361l12.689-13zm6.844 7.13v-2.927l-8.586 8.797h2.858zm-3.149 5.87h3.149v-3.226zm-11.685-13h-3.166v3.244z"/>
+</svg>

src/icons/thin/sign-in-local-http.svg

@@ -0,0 +1,3 @@
+<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="m8 9v-3c0-2.206 1.794-4 4-4s4 1.794 4 4v3h2v-3c0-3.313-2.687-6-6-6s-6 2.687-6 6v3zm.746 2h2.831l-8.577 8.787v-2.9zm12.254 1.562v-1.562h-1.37l-12.69 13h2.894zm-6.844-1.562-11.156 11.431v1.569h1.361l12.689-13zm6.844 7.13v-2.927l-8.586 8.797h2.858zm-3.149 5.87h3.149v-3.226zm-11.685-13h-3.166v3.244z"/>
+</svg>

src/icons/thin/sign-in-secure.svg

@@ -0,0 +1,3 @@
+<svg height="24" viewBox="0 0 24 24" width="24" xmlns="http://www.w3.org/2000/svg">
+    <path d="m21 21v3h-18v-3zm-13-15c0-2.206 1.795-4 4-4s4 1.794 4 4v3h2v-3c0-3.313-2.687-6-6-6s-6 2.687-6 6v3h2zm13 8v-3h-18v3zm0 5v-3h-18v3z"/>
+</svg>