@spartacus/core
Version:
Spartacus - the core framework
106 lines • 15.1 kB
JavaScript
import { isPlatformBrowser } from '@angular/common';
import { Inject, Injectable, isDevMode, PLATFORM_ID } from '@angular/core';
import { defer, of } from 'rxjs';
import { filter, map, shareReplay, switchMap } from 'rxjs/operators';
import { resolveApplicable } from '../../util/applicable';
import { uniteLatest } from '../../util/rxjs/unite-latest';
import { PageMetaResolver } from '../page/page-meta.resolver';
import * as i0 from "@angular/core";
import * as i1 from "./cms.service";
import * as i2 from "../../lazy-loading/unified-injector";
import * as i3 from "../page/config/page-meta.config";
/**
* Service that collects the page meta data by using injected page resolvers.
*/
export class PageMetaService {
constructor(cms, unifiedInjector, pageMetaConfig, platformId) {
this.cms = cms;
this.unifiedInjector = unifiedInjector;
this.pageMetaConfig = pageMetaConfig;
this.platformId = platformId;
this.resolvers$ = this.unifiedInjector
.getMulti(PageMetaResolver)
.pipe(shareReplay({ bufferSize: 1, refCount: true }));
this.meta$ = defer(() => this.cms.getCurrentPage()).pipe(filter((page) => Boolean(page)), switchMap((page) => this.getMetaResolver(page)), switchMap((metaResolver) => metaResolver ? this.resolve(metaResolver) : of(null)), shareReplay({ bufferSize: 1, refCount: true }));
}
/**
* Returns the observed page meta data for the current page.
*
* The data is resolved by various PageResolvers, which are configurable.
*/
getMeta() {
return this.meta$;
}
/**
* If a `PageResolver` has implemented a resolver interface, the resolved data
* is merged into the `PageMeta` object.
* @param metaResolver
*/
resolve(metaResolver) {
const resolverMethods = this.getResolverMethods();
const resolvedData = Object.keys(resolverMethods)
// TODO: Revisit if typing is possible here with Template Literal Types when we update to TS >=4.1
.filter((key) => metaResolver[resolverMethods[key]])
.map((key) => {
return metaResolver[resolverMethods[key]]()
.pipe(map((data) => ({ [key]: data })));
});
if (resolvedData.length === 0) {
// uniteLatest will fail otherwise
return of({});
}
else {
return uniteLatest(resolvedData).pipe(map((data) => Object.assign({}, ...data)));
}
}
/**
* Returns an object with resolvers. The object properties represent the `PageMeta` property, i.e.:
*
* ```
* {
* title: 'resolveTitle',
* robots: 'resolveRobots'
* }
* ```
*
* This list of resolvers is filtered for CSR vs SSR processing since not all resolvers are
* relevant during browsing.
*/
getResolverMethods() {
var _a, _b, _c;
let resolverMethods = {};
// filter the resolvers to avoid unnecessary processing in CSR
(_c = (_b = (_a = this.pageMetaConfig) === null || _a === void 0 ? void 0 : _a.pageMeta) === null || _b === void 0 ? void 0 : _b.resolvers) === null || _c === void 0 ? void 0 : _c.filter((resolver) => {
var _a, _b, _c;
return (
// always resolve in SSR
!isPlatformBrowser((_a = this.platformId) !== null && _a !== void 0 ? _a : '') ||
// resolve in CSR when it's not disabled
!resolver.disabledInCsr ||
// resolve in CSR when resolver is enabled in devMode
(isDevMode() && ((_c = (_b = this.pageMetaConfig) === null || _b === void 0 ? void 0 : _b.pageMeta) === null || _c === void 0 ? void 0 : _c.enableInDevMode)));
}).forEach((resolver) => (resolverMethods[resolver.property] = resolver.method));
return resolverMethods;
}
/**
* Return the resolver with the best match, based on a score
* generated by the resolver.
*
* Resolvers match by default on `PageType` and `page.template`.
*/
getMetaResolver(page) {
return this.resolvers$.pipe(map((resolvers) => resolveApplicable(resolvers, [page], [page])));
}
}
PageMetaService.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: PageMetaService, deps: [{ token: i1.CmsService }, { token: i2.UnifiedInjector }, { token: i3.PageMetaConfig }, { token: PLATFORM_ID }], target: i0.ɵɵFactoryTarget.Injectable });
PageMetaService.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: PageMetaService, providedIn: 'root' });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.0.5", ngImport: i0, type: PageMetaService, decorators: [{
type: Injectable,
args: [{
providedIn: 'root',
}]
}], ctorParameters: function () { return [{ type: i1.CmsService }, { type: i2.UnifiedInjector }, { type: i3.PageMetaConfig }, { type: undefined, decorators: [{
type: Inject,
args: [PLATFORM_ID]
}] }]; } });
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this.resolve(metaResolver) : of(null)\n    ),\n    shareReplay({ bufferSize: 1, refCount: true })\n  );\n\n  /**\n   * Returns the observed page meta data for the current page.\n   *\n   * The data is resolved by various PageResolvers, which are configurable.\n   */\n  getMeta(): Observable<PageMeta | null> {\n    return this.meta$;\n  }\n\n  /**\n   * If a `PageResolver` has implemented a resolver interface, the resolved data\n   * is merged into the `PageMeta` object.\n   * @param metaResolver\n   */\n  protected resolve(metaResolver: PageMetaResolver): Observable<PageMeta> {\n    const resolverMethods = this.getResolverMethods();\n    const resolvedData: Observable<PageMeta>[] = Object.keys(resolverMethods)\n      // TODO: Revisit if typing is possible here with Template Literal Types when we update to TS >=4.1\n      .filter((key) => (metaResolver as any)[resolverMethods[key]])\n      .map((key) => {\n        return (metaResolver as any)\n          [resolverMethods[key]]()\n          .pipe(map((data) => ({ [key]: data })));\n      });\n\n    if (resolvedData.length === 0) {\n      // uniteLatest will fail otherwise\n      return of({});\n    } else {\n      return uniteLatest(resolvedData).pipe(\n        map((data) => Object.assign({}, ...data))\n      );\n    }\n  }\n\n  /**\n   * Returns an object with resolvers. The object properties represent the `PageMeta` property, i.e.:\n   *\n   * ```\n   * {\n   *   title: 'resolveTitle',\n   *   robots: 'resolveRobots'\n   * }\n   * ```\n   *\n   * This list of resolvers is filtered for CSR vs SSR processing since not all resolvers are\n   * relevant during browsing.\n   */\n  protected getResolverMethods(): { [property: string]: string } {\n    let resolverMethods: Record<string, string> = {};\n    // filter the resolvers to avoid unnecessary processing in CSR\n    this.pageMetaConfig?.pageMeta?.resolvers\n      ?.filter((resolver) => {\n        return (\n          // always resolve in SSR\n          !isPlatformBrowser(this.platformId ?? '') ||\n          // resolve in CSR when it's not disabled\n          !resolver.disabledInCsr ||\n          // resolve in CSR when resolver is enabled in devMode\n          (isDevMode() && this.pageMetaConfig?.pageMeta?.enableInDevMode)\n        );\n      })\n      .forEach(\n        (resolver) => (resolverMethods[resolver.property] = resolver.method)\n      );\n    return resolverMethods;\n  }\n\n  /**\n   * Return the resolver with the best match, based on a score\n   * generated by the resolver.\n   *\n   * Resolvers match by default on `PageType` and `page.template`.\n   */\n  protected getMetaResolver(\n    page: Page\n  ): Observable<PageMetaResolver | undefined> {\n    return this.resolvers$.pipe(\n      map((resolvers) => resolveApplicable(resolvers, [page], [page]))\n    );\n  }\n}\n"]}