client/general: refactor control flow

- Controller lifetime is bound to route lifetime
- View lifetime is bound to controller lifetime
- Control lifetime is bound to view lifetime
- Enhanced event dispatching
- Enhanced responsiveness in some places
- Views communicate user input to controllers via new event system

client/js/controllers/user_controller.js

@@ -0,0 +1,166 @@
+'use strict';
+
+const router = require('../router.js');
+const api = require('../api.js');
+const config = require('../config.js');
+const views = require('../util/views.js');
+const topNavigation = require('../models/top_navigation.js');
+const UserView = require('../views/user_view.js');
+const EmptyView = require('../views/empty_view.js');
+
+const rankNames = new Map([
+    ['anonymous', 'Anonymous'],
+    ['restricted', 'Restricted user'],
+    ['regular', 'Regular user'],
+    ['power', 'Power user'],
+    ['moderator', 'Moderator'],
+    ['administrator', 'Administrator'],
+    ['nobody', 'Nobody'],
+]);
+
+class UserController {
+    constructor(ctx, section) {
+        new Promise((resolve, reject) => {
+            if (ctx.state.user) {
+                resolve(ctx.state.user);
+                return;
+            }
+            api.get('/user/' + ctx.params.name).then(response => {
+                response.rankName = rankNames.get(response.rank);
+                ctx.state.user = response;
+                ctx.save();
+                resolve(ctx.state.user);
+            }, response => {
+                reject(response.description);
+            });
+        }).then(user => {
+            const isLoggedIn = api.isLoggedIn(user);
+            const infix = isLoggedIn ? 'self' : 'any';
+
+            const myRankIndex = api.user ?
+                api.allRanks.indexOf(api.user.rank) :
+                0;
+            let ranks = {};
+            for (let [rankIdx, rankIdentifier] of api.allRanks.entries()) {
+                if (rankIdentifier === 'anonymous') {
+                    continue;
+                }
+                if (rankIdx > myRankIndex) {
+                    continue;
+                }
+                ranks[rankIdentifier] = rankNames.get(rankIdentifier);
+            }
+
+            if (isLoggedIn) {
+                topNavigation.activate('account');
+            } else {
+                topNavigation.activate('users');
+            }
+            this._view = new UserView({
+                user: user,
+                section: section,
+                isLoggedIn: isLoggedIn,
+                canEditName: api.hasPrivilege(`users:edit:${infix}:name`),
+                canEditPassword: api.hasPrivilege(`users:edit:${infix}:pass`),
+                canEditEmail: api.hasPrivilege(`users:edit:${infix}:email`),
+                canEditRank: api.hasPrivilege(`users:edit:${infix}:rank`),
+                canEditAvatar: api.hasPrivilege(`users:edit:${infix}:avatar`),
+                canEditAnything: api.hasPrivilege(`users:edit:${infix}`),
+                canDelete: api.hasPrivilege(`users:delete:${infix}`),
+                ranks: ranks,
+            });
+            this._view.addEventListener('change', e => this._evtChange(e));
+            this._view.addEventListener('delete', e => this._evtDelete(e));
+        }, errorMessage => {
+            this._view = new EmptyView();
+            this._view.showError(errorMessage);
+        });
+    }
+
+    _evtChange(e) {
+        this._view.clearMessages();
+        this._view.disableForm();
+        const isLoggedIn = api.isLoggedIn(e.detail.user);
+        const infix = isLoggedIn ? 'self' : 'any';
+
+        const files = [];
+        const data = {};
+        if (e.detail.name) {
+            data.name = e.detail.name;
+        }
+        if (e.detail.password) {
+            data.password = e.detail.password;
+        }
+        if (api.hasPrivilege('users:edit:' + infix + ':email')) {
+            data.email = e.detail.email;
+        }
+        if (e.detail.rank) {
+            data.rank = e.detail.rank;
+        }
+        if (e.detail.avatarStyle &&
+                (e.detail.avatarStyle != e.detail.user.avatarStyle ||
+                e.detail.avatarContent)) {
+            data.avatarStyle = e.detail.avatarStyle;
+        }
+        if (e.detail.avatarContent) {
+            files.avatar = e.detail.avatarContent;
+        }
+
+        api.put('/user/' + e.detail.user.name, data, files)
+            .then(response => {
+                return isLoggedIn ?
+                    api.login(
+                        data.name || api.userName,
+                        data.password || api.userPassword,
+                        false) :
+                    Promise.resolve();
+            }, response => {
+                return Promise.reject(response.description);
+            }).then(() => {
+                if (data.name && data.name !== e.detail.user.name) {
+                    // TODO: update header links and text
+                    router.replace('/user/' + data.name + '/edit', null, false);
+                }
+                this._view.showSuccess('Settings updated.');
+                this._view.enableForm();
+            }, errorMessage => {
+                this._view.showError(errorMessage);
+                this._view.enableForm();
+            });
+    }
+
+    _evtDelete(e) {
+        this._view.clearMessages();
+        this._view.disableForm();
+        const isLoggedIn = api.isLoggedIn(e.detail.user);
+        api.delete('/user/' + e.detail.user.name)
+            .then(response => {
+                if (isLoggedIn) {
+                    api.forget();
+                    api.logout();
+                }
+                if (api.hasPrivilege('users:list')) {
+                    const ctx = router.show('/users');
+                    ctx.controller.showSuccess('Account deleted.');
+                } else {
+                    const ctx = router.show('/');
+                    ctx.controller.showSuccess('Account deleted.');
+                }
+            }, response => {
+                this._view.showError(response.description);
+                this._view.enableForm();
+            });
+    }
+}
+
+module.exports = router => {
+    router.enter('/user/:name', (ctx, next) => {
+        ctx.controller = new UserController(ctx, 'summary');
+    });
+    router.enter('/user/:name/edit', (ctx, next) => {
+        ctx.controller = new UserController(ctx, 'edit');
+    });
+    router.enter('/user/:name/delete', (ctx, next) => {
+        ctx.controller = new UserController(ctx, 'delete');
+    });
+};