@pazznetwork/ngx-chat
Version:
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154 lines • 26.8 kB
JavaScript
import { xml } from '@xmpp/client';
import { BehaviorSubject, combineLatest, merge } from 'rxjs';
import { debounceTime, delay, distinctUntilChanged, map, share } from 'rxjs/operators';
import { Direction } from '../../../../core/message';
import { findSortedInsertionIndexLast } from '../../../../core/utils-array';
import { AbstractStanzaBuilder } from '../abstract-stanza-builder';
import { AbstractXmppPlugin } from './abstract-xmpp-plugin';
const STORAGE_NGX_CHAT_LAST_READ_DATE = 'ngxchat:unreadmessagedate';
const wrapperNodeName = 'entries';
const nodeName = 'last-read';
class LastReadEntriesNodeBuilder extends AbstractStanzaBuilder {
constructor() {
super(...arguments);
this.lastReadNodes = [];
}
addLastReadNode(jid, date) {
this.lastReadNodes.push(xml(nodeName, { jid, date }));
}
toStanza() {
return xml(wrapperNodeName, {}, ...this.lastReadNodes);
}
}
/**
* Unofficial plugin using XEP-0163 / PubSub to track count of unread messages per recipient
*
* It publishes entries to a private PubSub-Node 'ngxchat:unreadmessagedate'
* The stored elements look like this:
* <item id="current">
* <entries>
* <last-read jid="user1@host1.tld" date="1546419050584"/>
* <last-read jid="user2@host1.tld" date="1546419050000"/>
* </entries>
* </item>
*/
export class UnreadMessageCountPlugin extends AbstractXmppPlugin {
constructor(chatService, chatMessageListRegistry, publishSubscribePlugin, entityTimePlugin, multiUserChatPlugin) {
super();
this.chatService = chatService;
this.chatMessageListRegistry = chatMessageListRegistry;
this.publishSubscribePlugin = publishSubscribePlugin;
this.entityTimePlugin = entityTimePlugin;
this.multiUserChatPlugin = multiUserChatPlugin;
/**
* emits as soon as the unread message count changes, you might want to debounce it with e.g. half a a second, as
* new messages might be acknowledged in another session.
*/
this.jidToUnreadCount$ = new BehaviorSubject(new Map());
this.jidToLastReadTimestamp = new Map();
this.recipientIdToMessageSubscription = new Map();
this.chatMessageListRegistry.chatOpened$
.pipe(delay(0))
.subscribe(recipient => this.checkForUnreadCountChange(recipient));
merge(multiUserChatPlugin.rooms$, this.chatService.contactCreated$.pipe(map(contact => [contact]))).subscribe(recipients => {
for (const recipient of recipients) {
const jid = recipient.jidBare.toString();
if (!this.recipientIdToMessageSubscription.has(jid)) {
const messages$ = recipient.messages$;
const updateUnreadCountSubscription = messages$
.pipe(debounceTime(20))
.subscribe(() => this.checkForUnreadCountChange(recipient));
this.recipientIdToMessageSubscription.set(jid, updateUnreadCountSubscription);
}
}
});
this.publishSubscribePlugin.publish$
.subscribe((event) => this.handlePubSubEvent(event));
this.unreadMessageCountSum$ = combineLatest([this.jidToUnreadCount$, this.chatService.blockedContactIds$])
.pipe(debounceTime(20), map(([jidToUnreadCount, blockedContactIdSet]) => {
let sum = 0;
for (const [recipientJid, count] of jidToUnreadCount) {
if (!blockedContactIdSet.has(recipientJid)) {
sum += count;
}
}
return sum;
}), distinctUntilChanged(), share());
}
async checkForUnreadCountChange(recipient) {
if (this.chatMessageListRegistry.isChatOpen(recipient)) {
this.jidToLastReadTimestamp.set(recipient.jidBare.toString(), await this.entityTimePlugin.getNow());
await this.persistLastSeenDates();
}
this.updateContactUnreadMessageState(recipient);
}
async onBeforeOnline() {
const fetchedDates = await this.fetchLastSeenDates();
this.mergeJidToDates(fetchedDates);
}
onOffline() {
for (const subscription of this.recipientIdToMessageSubscription.values()) {
subscription.unsubscribe();
}
this.recipientIdToMessageSubscription.clear();
this.jidToLastReadTimestamp.clear();
this.jidToUnreadCount$.next(new Map());
}
async fetchLastSeenDates() {
const entries = await this.publishSubscribePlugin.retrieveNodeItems(STORAGE_NGX_CHAT_LAST_READ_DATE);
return this.parseLastSeenDates(entries);
}
parseLastSeenDates(topLevelElements) {
const result = new Map();
if (topLevelElements.length === 1) {
const [itemElement] = topLevelElements;
for (const lastReadEntry of itemElement.getChild(wrapperNodeName).getChildren(nodeName)) {
const { jid, date } = lastReadEntry.attrs;
if (!isNaN(date)) {
result.set(jid, date);
}
}
}
return result;
}
updateContactUnreadMessageState(recipient) {
const contactJid = recipient.jidBare.toString();
const lastReadDate = this.jidToLastReadTimestamp.get(contactJid) || 0;
const contactUnreadMessageCount = this.calculateUnreadMessageCount(recipient, lastReadDate);
const jidToCount = this.jidToUnreadCount$.getValue();
if (jidToCount.get(contactJid) !== contactUnreadMessageCount) {
this.jidToUnreadCount$.next(jidToCount.set(contactJid, contactUnreadMessageCount));
}
}
calculateUnreadMessageCount(recipient, lastReadTimestamp) {
const firstUnreadMessageIndex = findSortedInsertionIndexLast(lastReadTimestamp, recipient.messages, message => message.datetime.getTime());
return recipient.messages.slice(firstUnreadMessageIndex)
.filter(message => message.direction === Direction.in)
.length;
}
async persistLastSeenDates() {
const lastReadNodeBuilder = new LastReadEntriesNodeBuilder();
for (const [jid, date] of this.jidToLastReadTimestamp) {
lastReadNodeBuilder.addLastReadNode(jid, date.toString());
}
await this.publishSubscribePlugin.storePrivatePayloadPersistent(STORAGE_NGX_CHAT_LAST_READ_DATE, 'current', lastReadNodeBuilder.toStanza());
}
handlePubSubEvent(event) {
const items = event.getChild('items');
const itemsNode = items && items.attrs.node;
const item = items && items.getChildren('item');
if (itemsNode === STORAGE_NGX_CHAT_LAST_READ_DATE && item) {
const publishedLastJidToDate = this.parseLastSeenDates(item);
this.mergeJidToDates(publishedLastJidToDate);
}
}
mergeJidToDates(newJidToDate) {
for (const [jid, date] of newJidToDate) {
const oldLastReadDate = this.jidToLastReadTimestamp.get(jid);
if (!oldLastReadDate || oldLastReadDate < date) {
this.jidToLastReadTimestamp.set(jid, date);
}
}
}
}
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{ xml } from '@xmpp/client';\nimport { Element } from 'ltx';\nimport { BehaviorSubject, combineLatest, merge, Observable, Subject, Subscription } from 'rxjs';\nimport { debounceTime, delay, distinctUntilChanged, map, share } from 'rxjs/operators';\nimport { Direction, Message } from '../../../../core/message';\nimport { Recipient } from '../../../../core/recipient';\nimport { findSortedInsertionIndexLast } from '../../../../core/utils-array';\nimport { ChatMessageListRegistryService } from '../../../chat-message-list-registry.service';\nimport { AbstractStanzaBuilder } from '../abstract-stanza-builder';\nimport { XmppChatAdapter } from '../xmpp-chat-adapter.service';\nimport { AbstractXmppPlugin } from './abstract-xmpp-plugin';\nimport { EntityTimePlugin } from './entity-time.plugin';\nimport { MultiUserChatPlugin } from './multi-user-chat/multi-user-chat.plugin';\nimport { PublishSubscribePlugin } from './publish-subscribe.plugin';\n\nconst STORAGE_NGX_CHAT_LAST_READ_DATE = 'ngxchat:unreadmessagedate';\nconst wrapperNodeName = 'entries';\nconst nodeName = 'last-read';\n\nexport type JidToNumber = Map<string, number>;\ntype JidToLastReadTimestamp = Map<string, number>;\n\nclass LastReadEntriesNodeBuilder extends AbstractStanzaBuilder {\n\n    private lastReadNodes = [] as Element[];\n\n    addLastReadNode(jid: string, date: string) {\n        this.lastReadNodes.push(\n            xml(nodeName, {jid, date}),\n        );\n    }\n\n    toStanza(): Element {\n        return xml(wrapperNodeName, {}, ...this.lastReadNodes);\n    }\n\n}\n\n/**\n * Unofficial plugin using XEP-0163 / PubSub to track count of unread messages per recipient\n *\n * It publishes entries to a private PubSub-Node 'ngxchat:unreadmessagedate'\n * The stored elements look like this:\n * <item id=\"current\">\n *     <entries>\n *         <last-read jid=\"user1@host1.tld\" date=\"1546419050584\"/>\n *         <last-read jid=\"user2@host1.tld\" date=\"1546419050000\"/>\n *     </entries>\n * </item>\n */\nexport class UnreadMessageCountPlugin extends AbstractXmppPlugin {\n\n    /**\n     * already debounced to prevent the issues described in {@link UnreadMessageCountPlugin.jidToUnreadCount$}.\n     */\n    public readonly unreadMessageCountSum$: Observable<number>;\n    /**\n     * emits as soon as the unread message count changes, you might want to debounce it with e.g. half a a second, as\n     * new messages might be acknowledged in another session.\n     */\n    public readonly jidToUnreadCount$: BehaviorSubject<JidToNumber> = new BehaviorSubject(new Map<string, number>());\n    private readonly jidToLastReadTimestamp: JidToLastReadTimestamp = new Map<string, number>();\n    private readonly recipientIdToMessageSubscription = new Map<string, Subscription>();\n\n    constructor(\n        private chatService: XmppChatAdapter,\n        private chatMessageListRegistry: ChatMessageListRegistryService,\n        private publishSubscribePlugin: PublishSubscribePlugin,\n        private entityTimePlugin: EntityTimePlugin,\n        private multiUserChatPlugin: MultiUserChatPlugin,\n    ) {\n        super();\n\n        this.chatMessageListRegistry.chatOpened$\n            .pipe(\n                delay(0), // prevent 'Expression has changed after it was checked'\n            )\n            .subscribe(recipient => this.checkForUnreadCountChange(recipient));\n\n        merge(\n            multiUserChatPlugin.rooms$,\n            this.chatService.contactCreated$.pipe(map(contact => [contact])),\n        ).subscribe(recipients => {\n            for (const recipient of recipients) {\n                const jid = recipient.jidBare.toString();\n                if (!this.recipientIdToMessageSubscription.has(jid)) {\n                    const messages$: Subject<Message> = recipient.messages$;\n                    const updateUnreadCountSubscription = messages$\n                        .pipe(debounceTime(20))\n                        .subscribe(() => this.checkForUnreadCountChange(recipient));\n                    this.recipientIdToMessageSubscription.set(jid, updateUnreadCountSubscription);\n                }\n            }\n        });\n\n        this.publishSubscribePlugin.publish$\n            .subscribe((event) => this.handlePubSubEvent(event));\n\n        this.unreadMessageCountSum$ = combineLatest([this.jidToUnreadCount$, this.chatService.blockedContactIds$])\n            .pipe(\n                debounceTime(20),\n                map(([jidToUnreadCount, blockedContactIdSet]) => {\n                    let sum = 0;\n                    for (const [recipientJid, count] of jidToUnreadCount) {\n                        if (!blockedContactIdSet.has(recipientJid)) {\n                            sum += count;\n                        }\n                    }\n                    return sum;\n                }),\n                distinctUntilChanged(),\n                share(),\n            );\n    }\n\n    private async checkForUnreadCountChange(recipient: Recipient) {\n        if (this.chatMessageListRegistry.isChatOpen(recipient)) {\n            this.jidToLastReadTimestamp.set(recipient.jidBare.toString(), await this.entityTimePlugin.getNow());\n            await this.persistLastSeenDates();\n        }\n        this.updateContactUnreadMessageState(recipient);\n    }\n\n    async onBeforeOnline(): Promise<any> {\n        const fetchedDates = await this.fetchLastSeenDates();\n        this.mergeJidToDates(fetchedDates);\n    }\n\n    onOffline() {\n        for (const subscription of this.recipientIdToMessageSubscription.values()) {\n            subscription.unsubscribe();\n        }\n        this.recipientIdToMessageSubscription.clear();\n        this.jidToLastReadTimestamp.clear();\n        this.jidToUnreadCount$.next(new Map<string, number>());\n    }\n\n    private async fetchLastSeenDates(): Promise<JidToLastReadTimestamp> {\n        const entries = await this.publishSubscribePlugin.retrieveNodeItems(STORAGE_NGX_CHAT_LAST_READ_DATE);\n        return this.parseLastSeenDates(entries);\n    }\n\n    private parseLastSeenDates(topLevelElements: Element[]): JidToLastReadTimestamp {\n        const result: JidToLastReadTimestamp = new Map<string, number>();\n\n        if (topLevelElements.length === 1) {\n            const [itemElement] = topLevelElements;\n            for (const lastReadEntry of itemElement.getChild(wrapperNodeName).getChildren(nodeName)) {\n                const {jid, date} = lastReadEntry.attrs;\n                if (!isNaN(date)) {\n                    result.set(jid, date);\n                }\n            }\n        }\n\n        return result;\n    }\n\n    updateContactUnreadMessageState(recipient: Recipient) {\n        const contactJid = recipient.jidBare.toString();\n        const lastReadDate = this.jidToLastReadTimestamp.get(contactJid) || 0;\n        const contactUnreadMessageCount = this.calculateUnreadMessageCount(recipient, lastReadDate);\n        const jidToCount = this.jidToUnreadCount$.getValue();\n        if (jidToCount.get(contactJid) !== contactUnreadMessageCount) {\n            this.jidToUnreadCount$.next(jidToCount.set(contactJid, contactUnreadMessageCount));\n        }\n    }\n\n    private calculateUnreadMessageCount(recipient: Recipient, lastReadTimestamp: number) {\n        const firstUnreadMessageIndex = findSortedInsertionIndexLast(lastReadTimestamp, recipient.messages,\n            message => message.datetime.getTime());\n        return recipient.messages.slice(firstUnreadMessageIndex)\n            .filter(message => message.direction === Direction.in)\n            .length;\n    }\n\n    private async persistLastSeenDates() {\n        const lastReadNodeBuilder = new LastReadEntriesNodeBuilder();\n        for (const [jid, date] of this.jidToLastReadTimestamp) {\n            lastReadNodeBuilder.addLastReadNode(jid, date.toString());\n        }\n\n        await this.publishSubscribePlugin.storePrivatePayloadPersistent(\n            STORAGE_NGX_CHAT_LAST_READ_DATE,\n            'current',\n            lastReadNodeBuilder.toStanza());\n    }\n\n    private handlePubSubEvent(event: Element) {\n        const items = event.getChild('items');\n        const itemsNode = items && items.attrs.node;\n        const item = items && items.getChildren('item');\n        if (itemsNode === STORAGE_NGX_CHAT_LAST_READ_DATE && item) {\n            const publishedLastJidToDate = this.parseLastSeenDates(item);\n            this.mergeJidToDates(publishedLastJidToDate);\n        }\n    }\n\n    private mergeJidToDates(newJidToDate: JidToLastReadTimestamp) {\n        for (const [jid, date] of newJidToDate) {\n            const oldLastReadDate = this.jidToLastReadTimestamp.get(jid);\n            if (!oldLastReadDate || oldLastReadDate < date) {\n                this.jidToLastReadTimestamp.set(jid, date);\n            }\n        }\n    }\n}\n"]}