@ngx-meta/core
Version:
Dynamic page title & meta tags utility for Angular (w/server-side rendering)
206 lines • 30.1 kB
JavaScript
import { Injectable } from '@angular/core';
import { Meta, Title } from '@angular/platform-browser';
import { from as observableFrom, of as observableOf } from 'rxjs';
import { MetaLoader } from './meta.loader';
import { PageTitlePositioning } from './models/page-title-positioning';
import { isObservable, isPromise } from './util';
import * as i0 from "@angular/core";
import * as i1 from "./meta.loader";
import * as i2 from "@angular/platform-browser";
export class MetaService {
constructor(loader, title, meta) {
this.loader = loader;
this.title = title;
this.meta = meta;
this.settings = loader.settings;
this.isMetaTagSet = {};
}
setTitle(title, override = false) {
const title$ = title ? this.callback(title) : observableOf('');
title$.subscribe((res) => {
let fullTitle = '';
if (!res) {
const defaultTitle$ = this.settings.defaults && this.settings.defaults.title ? this.callback(this.settings.defaults.title) : observableOf('');
defaultTitle$.subscribe((defaultTitle) => {
if (!override && this.settings.pageTitleSeparator && this.settings.applicationName) {
this.callback(this.settings.applicationName).subscribe((applicationName) => {
fullTitle = applicationName ? this.getTitleWithPositioning(defaultTitle, applicationName) : defaultTitle;
this.updateTitle(fullTitle);
});
}
else {
this.updateTitle(defaultTitle);
}
});
}
else if (!override && this.settings.pageTitleSeparator && this.settings.applicationName) {
this.callback(this.settings.applicationName).subscribe((applicationName) => {
fullTitle = applicationName ? this.getTitleWithPositioning(res, applicationName) : res;
this.updateTitle(fullTitle);
});
}
else {
this.updateTitle(res);
}
});
}
setTag(key, value) {
if (key === 'title') {
throw new Error(`Attempt to set ${key} through "setTag": "title" is a reserved tag name. ` + 'Please use `MetaService.setTitle` instead.');
}
const cur = value || (this.settings.defaults && this.settings.defaults[key] ? this.settings.defaults[key] : '');
const value$ = key !== 'og:locale' && key !== 'og:locale:alternate' ? this.callback(cur) : observableOf(cur);
value$.subscribe((res) => {
this.updateTag(key, res);
});
}
update(currentUrl, metaSettings) {
if (!metaSettings) {
const fallbackTitle = this.settings.defaults
? this.settings.defaults.title || this.settings.applicationName
: this.settings.applicationName;
this.setTitle(fallbackTitle, true);
}
else {
if (metaSettings.disabled) {
this.update(currentUrl);
return;
}
this.setTitle(metaSettings.title, metaSettings.override);
Object.keys(metaSettings).forEach(key => {
let value = metaSettings[key];
if (key === 'title' || key === 'override') {
return;
}
else if (key === 'og:locale') {
value = value.replace(/-/g, '_');
}
else if (key === 'og:locale:alternate') {
const currentLocale = metaSettings['og:locale'];
this.updateLocales(currentLocale, metaSettings[key]);
return;
}
this.setTag(key, value);
});
}
if (this.settings.defaults) {
Object.keys(this.settings.defaults).forEach(key => {
let value = this.settings.defaults[key];
if ((metaSettings && (key in this.isMetaTagSet || key in metaSettings)) || key === 'title' || key === 'override') {
return;
}
else if (key === 'og:locale') {
value = value.replace(/-/g, '_');
}
else if (key === 'og:locale:alternate') {
const currentLocale = metaSettings ? metaSettings['og:locale'] : undefined;
this.updateLocales(currentLocale, value);
return;
}
this.setTag(key, value);
});
}
const baseUrl = this.settings.applicationUrl ? this.settings.applicationUrl : '/';
const url = `${baseUrl}${currentUrl}`.replace(/(https?:\/\/)|(\/)+/g, '$1$2').replace(/\/$/g, '');
this.setTag('og:url', url ? url : '/');
}
removeTag(key) {
this.meta.removeTag(key);
}
callback(value) {
if (this.settings.callback) {
const value$ = this.settings.callback(value);
if (!isObservable(value$)) {
return isPromise(value$) ? observableFrom(value$) : observableOf(value$);
}
return value$;
}
return observableOf(value);
}
getTitleWithPositioning(title, applicationName) {
switch (this.settings.pageTitlePositioning) {
case PageTitlePositioning.AppendPageTitle:
return applicationName + String(this.settings.pageTitleSeparator) + title;
case PageTitlePositioning.PrependPageTitle:
return title + String(this.settings.pageTitleSeparator) + applicationName;
default:
throw new Error(`Invalid pageTitlePositioning specified [${this.settings.pageTitlePositioning}]!`);
}
}
updateTitle(title) {
this.title.setTitle(title);
this.meta.updateTag({
property: 'og:title',
content: title
});
}
updateLocales(currentLocale, availableLocales) {
const cur = currentLocale || (this.settings.defaults ? this.settings.defaults['og:locale'] : '');
if (cur && this.settings.defaults) {
this.settings.defaults['og:locale'] = cur.replace(/_/g, '-');
}
const elements = this.meta.getTags('property="og:locale:alternate"');
elements.forEach((element) => {
this.meta.removeTagElement(element);
});
if (cur && availableLocales) {
availableLocales.split(',').forEach((locale) => {
if (cur.replace(/-/g, '_') !== locale.replace(/-/g, '_')) {
this.meta.addTag({
property: 'og:locale:alternate',
content: locale.replace(/-/g, '_')
});
}
});
}
}
updateTag(key, value) {
if (key.lastIndexOf('og:', 0) === 0) {
this.meta.updateTag({
property: key,
content: key === 'og:locale' ? value.replace(/-/g, '_') : value
});
}
else {
this.meta.updateTag({
name: key,
content: value
});
}
this.isMetaTagSet[key] = true;
if (key === 'description') {
this.meta.updateTag({
property: 'og:description',
content: value
});
}
else if (key === 'author') {
this.meta.updateTag({
property: 'og:author',
content: value
});
}
else if (key === 'publisher') {
this.meta.updateTag({
property: 'og:publisher',
content: value
});
}
else if (key === 'og:locale') {
const availableLocales = this.settings.defaults ? this.settings.defaults['og:locale:alternate'] : '';
this.updateLocales(value, availableLocales);
this.isMetaTagSet['og:locale:alternate'] = true;
}
else if (key === 'og:locale:alternate') {
const currentLocale = this.meta.getTag('property="og:locale"').content;
this.updateLocales(currentLocale, value);
this.isMetaTagSet['og:locale'] = true;
}
}
}
MetaService.ɵfac = function MetaService_Factory(t) { return new (t || MetaService)(i0.ɵɵinject(i1.MetaLoader), i0.ɵɵinject(i2.Title), i0.ɵɵinject(i2.Meta)); };
MetaService.ɵprov = i0.ɵɵdefineInjectable({ token: MetaService, factory: MetaService.ɵfac });
(function () { i0.ɵsetClassMetadata(MetaService, [{
type: Injectable
}], function () { return [{ type: i1.MetaLoader }, { type: i2.Title }, { type: i2.Meta }]; }, null); })();
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{ Injectable } from '@angular/core';\nimport { Meta, Title } from '@angular/platform-browser';\nimport { from as observableFrom, Observable, of as observableOf } from 'rxjs';\n\nimport { MetaLoader } from './meta.loader';\nimport { MetaSettings } from './models/meta-settings';\nimport { PageTitlePositioning } from './models/page-title-positioning';\nimport { isObservable, isPromise } from './util';\n\n@Injectable()\nexport class MetaService {\n  protected readonly settings: MetaSettings;\n  private readonly isMetaTagSet: any;\n\n  constructor(readonly loader: MetaLoader, private readonly title: Title, private readonly meta: Meta) {\n    this.settings = loader.settings;\n    this.isMetaTagSet = {};\n  }\n\n  setTitle(title: string, override = false): void {\n    const title$ = title ? this.callback(title) : observableOf('');\n\n    title$.subscribe((res: string) => {\n      let fullTitle = '';\n\n      if (!res) {\n        const defaultTitle$ =\n          this.settings.defaults && this.settings.defaults.title ? this.callback(this.settings.defaults.title) : observableOf('');\n\n        defaultTitle$.subscribe((defaultTitle: string) => {\n          if (!override && this.settings.pageTitleSeparator && this.settings.applicationName) {\n            this.callback(this.settings.applicationName).subscribe((applicationName: string) => {\n              fullTitle = applicationName ? this.getTitleWithPositioning(defaultTitle, applicationName) : defaultTitle;\n              this.updateTitle(fullTitle);\n            });\n          } else {\n            this.updateTitle(defaultTitle);\n          }\n        });\n      } else if (!override && this.settings.pageTitleSeparator && this.settings.applicationName) {\n        this.callback(this.settings.applicationName).subscribe((applicationName: string) => {\n          fullTitle = applicationName ? this.getTitleWithPositioning(res, applicationName) : res;\n          this.updateTitle(fullTitle);\n        });\n      } else {\n        this.updateTitle(res);\n      }\n    });\n  }\n\n  setTag(key: string, value: string): void {\n    if (key === 'title') {\n      throw new Error(\n        `Attempt to set ${key} through \"setTag\": \"title\" is a reserved tag name. ` + 'Please use `MetaService.setTitle` instead.'\n      );\n    }\n\n    const cur = value || (this.settings.defaults && this.settings.defaults[key] ? this.settings.defaults[key] : '');\n\n    const value$ = key !== 'og:locale' && key !== 'og:locale:alternate' ? this.callback(cur) : observableOf(cur);\n\n    value$.subscribe((res: string) => {\n      this.updateTag(key, res);\n    });\n  }\n\n  update(currentUrl: string, metaSettings?: any): void {\n    if (!metaSettings) {\n      const fallbackTitle = this.settings.defaults\n        ? this.settings.defaults.title || this.settings.applicationName\n        : this.settings.applicationName;\n\n      this.setTitle(fallbackTitle, true);\n    } else {\n      if (metaSettings.disabled) {\n        this.update(currentUrl);\n\n        return;\n      }\n\n      this.setTitle(metaSettings.title, metaSettings.override);\n\n      Object.keys(metaSettings).forEach(key => {\n        let value = metaSettings[key];\n\n        if (key === 'title' || key === 'override') {\n          return;\n        } else if (key === 'og:locale') {\n          value = value.replace(/-/g, '_');\n        } else if (key === 'og:locale:alternate') {\n          const currentLocale = metaSettings['og:locale'];\n          this.updateLocales(currentLocale, metaSettings[key]);\n\n          return;\n        }\n\n        this.setTag(key, value);\n      });\n    }\n\n    if (this.settings.defaults) {\n      Object.keys(this.settings.defaults).forEach(key => {\n        let value = this.settings.defaults[key];\n\n        if ((metaSettings && (key in this.isMetaTagSet || key in metaSettings)) || key === 'title' || key === 'override') {\n          return;\n        } else if (key === 'og:locale') {\n          value = value.replace(/-/g, '_');\n        } else if (key === 'og:locale:alternate') {\n          const currentLocale = metaSettings ? metaSettings['og:locale'] : undefined;\n          this.updateLocales(currentLocale, value);\n\n          return;\n        }\n\n        this.setTag(key, value);\n      });\n    }\n\n    const baseUrl = this.settings.applicationUrl ? this.settings.applicationUrl : '/';\n    const url = `${baseUrl}${currentUrl}`.replace(/(https?:\\/\\/)|(\\/)+/g, '$1$2').replace(/\\/$/g, '');\n\n    this.setTag('og:url', url ? url : '/');\n  }\n\n  removeTag(key: string): void {\n    this.meta.removeTag(key);\n  }\n\n  private callback(value: string): Observable<string> {\n    if (this.settings.callback) {\n      const value$ = this.settings.callback(value);\n\n      if (!isObservable(value$)) {\n        return isPromise(value$) ? observableFrom(value$) : observableOf(value$);\n      }\n\n      return value$;\n    }\n\n    return observableOf(value);\n  }\n\n  private getTitleWithPositioning(title: string, applicationName: string): string {\n    switch (this.settings.pageTitlePositioning) {\n      case PageTitlePositioning.AppendPageTitle:\n        return applicationName + String(this.settings.pageTitleSeparator) + title;\n      case PageTitlePositioning.PrependPageTitle:\n        return title + String(this.settings.pageTitleSeparator) + applicationName;\n      default:\n        throw new Error(`Invalid pageTitlePositioning specified [${this.settings.pageTitlePositioning}]!`);\n    }\n  }\n\n  private updateTitle(title: string): void {\n    this.title.setTitle(title);\n    this.meta.updateTag({\n      property: 'og:title',\n      content: title\n    });\n  }\n\n  private updateLocales(currentLocale: string, availableLocales: string): void {\n    const cur = currentLocale || (this.settings.defaults ? this.settings.defaults['og:locale'] : '');\n\n    if (cur && this.settings.defaults) {\n      this.settings.defaults['og:locale'] = cur.replace(/_/g, '-');\n    }\n\n    // TODO: set HTML lang attribute - https://github.com/ngx-meta/core/issues/32\n    // const html = this.document.querySelector('html');\n    // html.setAttribute('lang', cur);\n\n    const elements = this.meta.getTags('property=\"og:locale:alternate\"');\n\n    elements.forEach((element: any) => {\n      this.meta.removeTagElement(element);\n    });\n\n    if (cur && availableLocales) {\n      availableLocales.split(',').forEach((locale: string) => {\n        if (cur.replace(/-/g, '_') !== locale.replace(/-/g, '_')) {\n          this.meta.addTag({\n            property: 'og:locale:alternate',\n            content: locale.replace(/-/g, '_')\n          });\n        }\n      });\n    }\n  }\n\n  private updateTag(key: string, value: string): void {\n    if (key.lastIndexOf('og:', 0) === 0) {\n      this.meta.updateTag({\n        property: key,\n        content: key === 'og:locale' ? value.replace(/-/g, '_') : value\n      });\n    } else {\n      this.meta.updateTag({\n        name: key,\n        content: value\n      });\n    }\n\n    this.isMetaTagSet[key] = true;\n\n    if (key === 'description') {\n      this.meta.updateTag({\n        property: 'og:description',\n        content: value\n      });\n    } else if (key === 'author') {\n      this.meta.updateTag({\n        property: 'og:author',\n        content: value\n      });\n    } else if (key === 'publisher') {\n      this.meta.updateTag({\n        property: 'og:publisher',\n        content: value\n      });\n    } else if (key === 'og:locale') {\n      const availableLocales = this.settings.defaults ? this.settings.defaults['og:locale:alternate'] : '';\n\n      this.updateLocales(value, availableLocales);\n      this.isMetaTagSet['og:locale:alternate'] = true;\n    } else if (key === 'og:locale:alternate') {\n      const currentLocale = this.meta.getTag('property=\"og:locale\"').content;\n\n      this.updateLocales(currentLocale, value);\n      this.isMetaTagSet['og:locale'] = true;\n    }\n  }\n}\n"]}