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import { Inject, Injectable } from '@angular/core'; | |
import {Meta, MetaDefinition, Title} from '@angular/platform-browser'; | |
import {HOST_URL} from './tokens/host-url'; | |
import { Router } from '@angular/router'; | |
export interface PageMetadata { | |
title: string; | |
// image will be added later | |
description: string; | |
author: string; | |
keywords: string[]; | |
type: string; | |
} | |
const defaultMetadata: PageMetadata = { | |
title: 'App Title', | |
description: 'App description', | |
author: 'Daniil Baunov', | |
keywords: ['Angular', 'meta tags', 'Angular Universal'], | |
type: 'website', | |
} | |
@Injectable() | |
export class MetadataService { | |
constructor(private metaTagService: Meta, | |
private titleService: Title, | |
@Inject(HOST_URL) private hostUrl: string, | |
private router: Router) {} | |
public updateMetadata(metadata: Partial<PageMetadata>, index: boolean = true): void { | |
const pageMetadata: PageMetadata = {...defaultMetadata, ...metadata}; | |
const metatags: MetaDefinition[] = this.generateMetaDefinitions(pageMetadata); | |
this.metaTagService.addTags([ | |
...metatags, | |
{ property: 'og:url', content: `${this.hostUrl}${this.router.url}`}, | |
{ name: 'robots', content: index ? 'index, follow' : 'noindex' }, | |
{ name: 'viewport', content: 'width=device-width, initial-scale=1' }, | |
{ 'http-equiv': 'Content-Type', content: 'text/html; charset=utf-8' }, | |
]); | |
this.titleService.setTitle(pageMetadata.title); | |
} | |
private generateMetaDefinitions(metadata: PageMetadata): MetaDefinition[] { | |
return [ | |
{ name: 'title', content: metadata.title }, | |
{ property: 'og:title', content: metadata.title }, | |
{ name: 'description', content: metadata.description }, | |
{ property: 'og:description', content: metadata.description }, | |
{ name: 'author', content: metadata.author }, | |
{ property: 'og:author', content: metadata.author }, | |
{ name: 'keywords', content: metadata.keywords.join(', ') }, | |
{ property: 'og:type', content: metadata.type }, | |
]; | |
} | |
} |
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