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import { Inject, Injectable, LOCALE_ID, NgZone, PLATFORM_ID, Renderer2, RendererFactory2, ViewEncapsulation } from '@angular/core';
import { DomSanitizer, Meta, SafeHtml, Title } from '@angular/platform-browser';
import { Router } from '@angular/router';
import { Observable, Subject } from 'rxjs';
import { environment } from '../../environments/environment';
import { APP_CONFIG, InterfaceAppConfig } from '../app-config';
import { ConfigSeoModel, HtmlLinkElementModel, HttpStatusModel, PageBaseModel } from '../models';
import { JsonLDService } from './jsonld.service';
/**
* Seo Service
*/
@Injectable()
export class SeoService {
/** locale */
locale: string;
/** Renderer2 object */
renderer: Renderer2;
/**
* custom SEO Meta Tags
* We need to keep them in order to remove them before load tags of next page
*/
customSEOMetaTags: Array<{
/** type of meta tag; name or property */
type: string,
/** value of name or property, NOT content value */
value: string
}>;
/** config for SEO */
configSEO: ConfigSeoModel = {};
/** http status */
private readonly httpStatus$ = new Subject<HttpStatusModel>();
/**
* constructor of SeoService
* @param meta: Meta
* @param titleService: Title
* @param router: Router
* @param ngZone: NgZone
* @param rendererFactory: RendererFactory2
* @param platformLocation: PlatformLocation
* @param sanitizer: DomSanitizer
* @param platformId: PLATFORM_ID
* @param appConfig: APP_CONFIG
* @param localeP: LOCALE_ID
* @param doc: DOCUMENT
* @param jsonLDService: JsonLDService
*/
constructor(private readonly meta: Meta,
private readonly titleService: Title,
private readonly router: Router,
private readonly ngZone: NgZone,
private readonly rendererFactory: RendererFactory2,
private readonly platformLocation: PlatformLocation,
private readonly sanitizer: DomSanitizer,
@Inject(PLATFORM_ID) private readonly platformId: string,
@Inject(APP_CONFIG) private readonly appConfig: InterfaceAppConfig,
@Inject(LOCALE_ID) private readonly localeP: string,
@Inject(DOCUMENT) public doc: Document,
private readonly jsonLDService: JsonLDService) {
this.locale = localeP === 'tr' ? 'tr-TR' : 'en-US'; // TODO: fix for other locales, this is quick fix to force to use with culture codes
}
/**
* Set Html Tags
* @param page: current page
*/
setSEOData(page: PageBaseModel): void {
const tempPage = {...page};
this.titleService.setTitle(tempPage.title);
this.meta.updateTag({itemprop: 'name', content: tempPage.title}, "itemprop='name'");
this.meta.updateTag({name: 'description', content: tempPage.description}, "name='description'");
this.meta.updateTag({itemprop: 'description', content: tempPage.description}, "itemprop='description'");
if (tempPage.image) {
this.meta.updateTag({itemprop: 'image', content: tempPage.image.src}, "itemprop='image'");
} else {
this.meta.removeTag("itemprop='image'");
}
this.meta.updateTag({name: 'apple-mobile-web-app-title', content: tempPage.title}, "name='apple-mobile-web-app-title'");
this.setLocalAndUrlHtmlTags(tempPage);
this.setProjectSpecifiedHtmlTags();
this.setCustomSEOHtmlTags(tempPage);
this.jsonLDService.setJsonLD(tempPage, this.configSEO);
}
/**
* Set Locale and Url Html Tags
* @param tempPage: current page
*/
setLocalAndUrlHtmlTags(tempPage: PageBaseModel): void {
if (!tempPage.hasOwnProperty('locales')) {
tempPage.locales = [];
}
const protocol = environment.protocol;
const host = environment.host;
const cultureCode = this.locale;
const languageCode = this.locale.substr(0, 2);
const slug = this.platformLocation.pathname;
tempPage.canonicalUrl = `${protocol}${host}${slug}`;
this.updateLink({rel: 'canonical', href: tempPage.canonicalUrl}, "link[rel='canonical']");
this.meta.updateTag({httpEquiv: 'Content-Language', content: languageCode}, "httpEquiv='Content-Language'");
this.meta.updateTag({property: 'og:url', content: tempPage.canonicalUrl}, "property='og:url'");
this.meta.updateTag({property: 'og:locale', content: cultureCode.replace('-', '_')},
"property='og:locale'");
this.meta.removeTag("property='og:locale:alternate'");
this.removeLink("link[rel='alternate']");
for (const langAlternate of tempPage.locales) {
this.meta.updateTag({property: 'og:locale:alternate', content: langAlternate.cultureCode.replace('-', '_')});
this.updateLink({
rel: 'alternate',
href: `${protocol}${host}/${langAlternate.slug}`,
hreflang: langAlternate.cultureCode
});
}
this.updateLink({
rel: 'alternate',
href: tempPage.canonicalUrl,
hreflang: cultureCode
});
this.updateLink({
rel: 'alternate',
href: tempPage.canonicalUrl,
hreflang: 'x-default'
});
}
/**
* Set Project Specified Html Tags
*/
setProjectSpecifiedHtmlTags(): void {
if (environment.defaultData['twitter:site']) {
this.meta.updateTag({name: 'twitter:site', content: environment.defaultData['twitter:site']},
"name='twitter:site'");
}
if (environment.defaultData['twitter:creator']) {
this.meta.updateTag({name: 'twitter:creator', content: environment.defaultData['twitter:creator']},
"name='twitter:creator'");
}
if (environment.defaultData['fb:app_id']) {
this.meta.updateTag({property: 'fb:app_id', content: environment.defaultData['fb:app_id']},
"property='fb:app_id'");
}
if (environment.defaultData['fb:admins']) {
this.meta.updateTag({property: 'fb:admins', content: environment.defaultData['fb:admins']},
"property='fb:admins'");
}
}
/**
* Set Custom SEO Html Tags
* @param tempPage: current page
*/
setCustomSEOHtmlTags(tempPage: PageBaseModel): void {
if (this.customSEOMetaTags) {
for (const customSEO of this.customSEOMetaTags) {
this.meta.removeTag(`${customSEO.type}='${customSEO.value}'`);
}
} else {
this.customSEOMetaTags = [];
}
if (tempPage.hasOwnProperty('seo')) {
if (tempPage.seo.hasOwnProperty('names')) {
Object.keys(tempPage.seo.names)
.forEach((prop: string) => {
this.meta.updateTag({name: prop, content: tempPage.seo.names[prop]}, `name='${prop}'`);
this.customSEOMetaTags.push({type: 'name', value: prop});
});
}
if (tempPage.seo.hasOwnProperty('properties')) {
Object.keys(tempPage.seo.properties)
.forEach((prop: string) => {
this.meta.updateTag({property: prop, content: tempPage.seo.properties[prop]}, `property='${prop}'`);
this.customSEOMetaTags.push({type: 'property', value: prop});
});
}
}
}
/**
* add or update link to head of document
* @param linkObject: tags of link
* @param attrSelector: selector to remove old link elements
*/
updateLink(linkObject: HtmlLinkElementModel, attrSelector?: string): void {
if (this.renderer === undefined) {
this.renderer = this.rendererFactory.createRenderer(this.doc, {
id: '-1',
encapsulation: ViewEncapsulation.None,
styles: [],
data: {}
});
}
this.removeLink(attrSelector);
const link = this.renderer.createElement('link');
Object.keys(linkObject)
.forEach((prop: string) => {
this.renderer.setAttribute(link, prop, linkObject[prop]);
});
this.renderer.appendChild(this.doc.head, link);
}
/**
* add or remove link from head of document
* @param attrSelector: selector to remove old link elements
*/
removeLink(attrSelector: string): void {
if (attrSelector) {
this.doc.querySelectorAll(attrSelector)
.forEach((oldLink: Element) => {
this.renderer.removeChild(this.doc.head, oldLink);
});
}
}
/**
* get title of current page
*/
getTitle(): string {
return this.titleService.getTitle();
}
/**
* get meta object of current page
*/
getMeta(): Meta {
return this.meta;
}
/**
* http 301 redirection
* @param destinationURL: destination URL
* @param isExternal: is this url external?
*/
http301(destinationURL: string, isExternal = false): void {
const destURL = destinationURL.replace(/[\/]+/g, '/');
if (isPlatformBrowser(this.platformId)) {
// istanbul ignore next
if (isExternal && !this.appConfig.isUnitTest) {
// this.router.navigate can't work because it is out of base url
window.location.href = destURL;
} else {
this.ngZone.run(() => {
this.router.navigate([destURL])
.catch(// istanbul ignore next
reason => {
console.error(reason);
});
});
}
} else {
this.httpStatus$.next({
code: 301,
htmlContent: `--http-redirect-301--${destURL}--end-of-http-redirect-301--`
});
}
}
/**
* http 404 not found
* @param htmlContent: html content, can be useful for debugging
*/
http404(htmlContent?: string): void {
if (isPlatformBrowser(this.platformId)) {
this.ngZone.run(() => {
this.router.navigate([this.router.url, 'http-404'])
.catch(// istanbul ignore next
reason => {
console.error(reason);
});
});
} else {
this.httpStatus$.next({
code: 404,
htmlContent
});
}
}
/**
* get http status
*/
getHttpStatus(): Observable<HttpStatusModel> {
return this.httpStatus$.asObservable();
}
}
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