@pazznetwork/ngx-chat
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115 lines • 19.5 kB
JavaScript
import { xml } from '@xmpp/client';
import { BehaviorSubject } from 'rxjs';
import { first } from 'rxjs/operators';
import { AbstractStanzaBuilder } from '../abstract-stanza-builder';
import { AbstractXmppPlugin } from './abstract-xmpp-plugin';
class QueryStanzaBuilder extends AbstractStanzaBuilder {
constructor(xmlns, to) {
super();
this.xmlns = xmlns;
this.to = to;
}
toStanza() {
return xml('iq', {
type: 'get',
...(this.to ? { to: this.to } : {}),
}, xml('query', { xmlns: this.xmlns }));
}
}
/**
* see XEP-0030 Service Discovery
*/
export class ServiceDiscoveryPlugin extends AbstractXmppPlugin {
constructor(chatAdapter) {
super();
this.chatAdapter = chatAdapter;
this.servicesInitialized$ = new BehaviorSubject(false);
this.hostedServices = [];
this.resourceCache = new Map();
}
async onBeforeOnline() {
await this.discoverServices(this.chatAdapter.chatConnectionService.userJid.domain);
this.servicesInitialized$.next(true);
}
onOffline() {
this.servicesInitialized$.next(false);
this.hostedServices = [];
this.resourceCache.clear();
}
supportsFeature(jid, searchedFeature) {
return new Promise((resolve, reject) => {
this.servicesInitialized$.pipe(first(value => !!value)).subscribe(async () => {
try {
const service = this.resourceCache.get(jid) || await this.discoverServiceInformation(jid);
if (!service) {
reject(new Error('no service found for jid ' + jid));
}
resolve(service.features.includes(searchedFeature));
}
catch (e) {
reject(e);
}
});
});
}
findService(category, type) {
return new Promise((resolve, reject) => {
this.servicesInitialized$.pipe(first(value => !!value)).subscribe(() => {
const results = this.hostedServices.filter(service => service.identitiesAttrs.filter(identityAttrs => identityAttrs.category === category
&& identityAttrs.type === type).length > 0);
if (results.length === 0) {
reject(new Error(`no service matching category ${category} and type ${type} found!`));
}
else if (results.length > 1) {
reject(new Error(`multiple services matching category ${category} and type ${type} found! ${JSON.stringify(results)}`));
}
else {
return resolve(results[0]);
}
});
});
}
async discoverServices(mainDomain) {
const serviceListResponse = await this.chatAdapter.chatConnectionService.sendIq(new QueryStanzaBuilder(ServiceDiscoveryPlugin.DISCO_ITEMS, this.chatAdapter.chatConnectionService.userJid.domain).toStanza());
const serviceDomains = new Set(serviceListResponse
.getChild('query')
.getChildren('item')
.map((itemNode) => itemNode.attrs.jid));
serviceDomains.add(mainDomain);
const discoveredServices = await Promise.all([...serviceDomains.keys()]
.map((serviceDomain) => this.discoverServiceInformation(serviceDomain)));
this.hostedServices.push(...discoveredServices);
}
async discoverServiceInformation(serviceDomain) {
const serviceInformationResponse = await this.chatAdapter.chatConnectionService.sendIq(new QueryStanzaBuilder(ServiceDiscoveryPlugin.DISCO_INFO, serviceDomain).toStanza());
const queryNode = serviceInformationResponse.getChild('query');
const features = queryNode.getChildren('feature').map((featureNode) => featureNode.attrs.var);
const identitiesAttrs = queryNode
.getChildren('identity')
.filter((identityNode) => identityNode.attrs)
.map((identityNode) => identityNode.attrs);
const serviceInformation = {
identitiesAttrs: this.isIdentitiesAttrs(identitiesAttrs) ? identitiesAttrs : [],
features,
jid: serviceInformationResponse.attrs.from,
};
this.resourceCache.set(serviceInformationResponse.attrs.from, serviceInformation);
return serviceInformation;
}
isIdentitiesAttrs(elements) {
return elements.every((element) => {
const keys = Object.keys(element);
const mustHave = keys.includes('category') && keys.includes('type');
if (keys.length === 2) {
return mustHave;
}
else if (keys.length === 3) {
return mustHave && keys.includes('name');
}
return false;
});
}
}
ServiceDiscoveryPlugin.DISCO_INFO = 'http://jabber.org/protocol/disco#info';
ServiceDiscoveryPlugin.DISCO_ITEMS = 'http://jabber.org/protocol/disco#items';
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{ xml } from '@xmpp/client';\nimport { Element } from 'ltx';\nimport { BehaviorSubject } from 'rxjs';\nimport { first } from 'rxjs/operators';\nimport { AbstractStanzaBuilder } from '../abstract-stanza-builder';\nimport { XmppChatAdapter } from '../xmpp-chat-adapter.service';\nimport { AbstractXmppPlugin } from './abstract-xmpp-plugin';\n\nclass QueryStanzaBuilder extends AbstractStanzaBuilder {\n\n    constructor(private xmlns: string, private to?: string) {\n        super();\n    }\n\n    toStanza() {\n        return xml('iq',\n            {\n                type: 'get',\n                ...(this.to ? {to: this.to} : {}),\n            },\n            xml('query', {xmlns: this.xmlns}),\n        );\n    }\n\n}\n\nexport interface IdentityAttrs {\n    category: string;\n    type: string;\n    name?: string;\n}\n\nexport interface Service {\n    jid: string;\n    identitiesAttrs: IdentityAttrs[];\n    features: string[];\n}\n\n/**\n * see XEP-0030 Service Discovery\n */\nexport class ServiceDiscoveryPlugin extends AbstractXmppPlugin {\n\n    public static readonly DISCO_INFO = 'http://jabber.org/protocol/disco#info';\n    public static readonly DISCO_ITEMS = 'http://jabber.org/protocol/disco#items';\n\n    private readonly servicesInitialized$ = new BehaviorSubject(false);\n    private hostedServices: Service[] = [];\n    private readonly resourceCache = new Map<string, Service>();\n\n    constructor(private readonly chatAdapter: XmppChatAdapter) {\n        super();\n    }\n\n    async onBeforeOnline(): Promise<void> {\n        await this.discoverServices(this.chatAdapter.chatConnectionService.userJid.domain);\n        this.servicesInitialized$.next(true);\n    }\n\n    onOffline(): void {\n        this.servicesInitialized$.next(false);\n        this.hostedServices = [];\n        this.resourceCache.clear();\n    }\n\n    supportsFeature(jid: string, searchedFeature: string): Promise<boolean> {\n\n        return new Promise((resolve, reject) => {\n\n            this.servicesInitialized$.pipe(first(value => !!value)).subscribe(async () => {\n                try {\n                    const service = this.resourceCache.get(jid) || await this.discoverServiceInformation(jid);\n                    if (!service) {\n                        reject(new Error('no service found for jid ' + jid));\n                    }\n                    resolve(service.features.includes(searchedFeature));\n                } catch (e) {\n                    reject(e);\n                }\n            });\n\n        });\n\n    }\n\n    findService(category: string, type: string): Promise<Service> {\n\n        return new Promise((resolve, reject) => {\n\n            this.servicesInitialized$.pipe(first(value => !!value)).subscribe(() => {\n                const results = this.hostedServices.filter(service =>\n                    service.identitiesAttrs.filter(identityAttrs => identityAttrs.category === category\n                        && identityAttrs.type === type).length > 0,\n                );\n\n                if (results.length === 0) {\n                    reject(new Error(`no service matching category ${category} and type ${type} found!`));\n                } else if (results.length > 1) {\n                    reject(new Error(`multiple services matching category ${category} and type ${type} found! ${JSON.stringify(results)}`));\n                } else {\n                    return resolve(results[0]);\n                }\n            });\n\n        });\n\n    }\n\n    private async discoverServices(mainDomain: string): Promise<void> {\n        const serviceListResponse = await this.chatAdapter.chatConnectionService.sendIq(\n            new QueryStanzaBuilder(\n                ServiceDiscoveryPlugin.DISCO_ITEMS, this.chatAdapter.chatConnectionService.userJid.domain).toStanza(),\n        );\n\n        const serviceDomains = new Set(\n            serviceListResponse\n                .getChild('query')\n                .getChildren('item')\n                .map((itemNode: Element) => itemNode.attrs.jid as string),\n        );\n        serviceDomains.add(mainDomain);\n\n        const discoveredServices: Service[] = await Promise.all(\n            [...serviceDomains.keys()]\n                .map((serviceDomain) => this.discoverServiceInformation(serviceDomain)),\n        );\n        this.hostedServices.push(...discoveredServices);\n    }\n\n    private async discoverServiceInformation(serviceDomain: string): Promise<Service> {\n        const serviceInformationResponse = await this.chatAdapter.chatConnectionService.sendIq(\n            new QueryStanzaBuilder(ServiceDiscoveryPlugin.DISCO_INFO, serviceDomain).toStanza(),\n        );\n\n        const queryNode = serviceInformationResponse.getChild('query');\n        const features = queryNode.getChildren('feature').map((featureNode: Element) => featureNode.attrs.var);\n        const identitiesAttrs = queryNode\n            .getChildren('identity')\n            .filter((identityNode: Element) => identityNode.attrs)\n            .map((identityNode: Element) => identityNode.attrs);\n\n        const serviceInformation: Service = {\n            identitiesAttrs: this.isIdentitiesAttrs(identitiesAttrs) ? identitiesAttrs : [],\n            features,\n            jid: serviceInformationResponse.attrs.from,\n        };\n        this.resourceCache.set(serviceInformationResponse.attrs.from, serviceInformation);\n        return serviceInformation;\n    }\n\n    private isIdentitiesAttrs(elements: { [attrName: string]: any }[]): elements is IdentityAttrs[] {\n        return elements.every((element) => {\n            const keys = Object.keys(element);\n            const mustHave = keys.includes('category') && keys.includes('type');\n            if (keys.length === 2) {\n                return mustHave;\n            } else if (keys.length === 3) {\n                return mustHave && keys.includes('name');\n            }\n            return false;\n        });\n    }\n}\n"]}