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* Coherent.js SEO Meta Tags
*
* Utilities for generating SEO meta tags
*
* @module seo/meta
*/
/**
* Meta Tag Builder
* Creates SEO-optimized meta tags
*/
export class MetaBuilder {
constructor(defaults = {}) {
this.defaults = {
siteName: '',
siteUrl: '',
locale: 'en_US',
twitterHandle: '',
...defaults
};
this.tags = [];
}
/**
* Set page title
*/
title(title, options = {}) {
// A replacer function, so `$&`, `$'`, `` $` `` or `$$` in the title are
// inserted literally instead of being read as replacement patterns.
const fullTitle = options.template
? options.template.replace('%s', () => title)
: title;
this.tags.push({ title: { text: fullTitle } });
// Open Graph
this.og('title', fullTitle);
// Twitter
this.twitter('title', fullTitle);
return this;
}
/**
* Set page description
*/
description(description) {
this.tags.push({
meta: {
name: 'description',
content: description
}
});
// Open Graph
this.og('description', description);
// Twitter
this.twitter('description', description);
return this;
}
/**
* Set canonical URL
*/
canonical(url) {
this.tags.push({
link: {
rel: 'canonical',
href: url
}
});
// Open Graph
this.og('url', url);
return this;
}
/**
* Set keywords
*/
keywords(keywords) {
const keywordString = Array.isArray(keywords) ? keywords.join(', ') : keywords;
this.tags.push({
meta: {
name: 'keywords',
content: keywordString
}
});
return this;
}
/**
* Set robots directives
*/
robots(directives) {
const content = Array.isArray(directives) ? directives.join(', ') : directives;
this.tags.push({
meta: {
name: 'robots',
content
}
});
return this;
}
/**
* Set Open Graph tag
*/
og(property, content) {
this.tags.push({
meta: {
property: `og:${property}`,
content
}
});
return this;
}
/**
* Set Twitter Card tag
*/
twitter(name, content) {
this.tags.push({
meta: {
name: `twitter:${name}`,
content
}
});
return this;
}
/**
* Set image for social sharing
*/
image(url, options = {}) {
// Open Graph
this.og('image', url);
if (options.width) this.og('image:width', options.width);
if (options.height) this.og('image:height', options.height);
if (options.alt) this.og('image:alt', options.alt);
// Twitter
this.twitter('image', url);
if (options.alt) this.twitter('image:alt', options.alt);
return this;
}
/**
* Set article metadata
*/
article(options = {}) {
this.og('type', 'article');
Eif (options.publishedTime) {
this.og('article:published_time', options.publishedTime);
}
Iif (options.modifiedTime) {
this.og('article:modified_time', options.modifiedTime);
}
Eif (options.author) {
this.og('article:author', options.author);
}
Iif (options.section) {
this.og('article:section', options.section);
}
Eif (options.tags) {
options.tags.forEach(tag => this.og('article:tag', tag));
}
return this;
}
/**
* Set Twitter Card type
*/
twitterCard(type = 'summary_large_image') {
this.twitter('card', type);
if (this.defaults.twitterHandle) {
this.twitter('site', this.defaults.twitterHandle);
}
return this;
}
/**
* Set locale
*/
locale(locale, alternates = []) {
this.og('locale', locale);
alternates.forEach(alt => {
this.og('locale:alternate', alt);
});
return this;
}
/**
* Set site name
*/
siteName(name) {
this.og('site_name', name || this.defaults.siteName);
return this;
}
/**
* Add custom meta tag
*/
meta(attributes) {
this.tags.push({ meta: attributes });
return this;
}
/**
* Add link tag
*/
link(attributes) {
this.tags.push({ link: attributes });
return this;
}
/**
* Build all meta tags
*/
build() {
return this.tags;
}
/**
* Reset builder
*/
reset() {
this.tags = [];
return this;
}
}
/**
* Create a meta builder
*/
export function createMetaBuilder(defaults = {}) {
return new MetaBuilder(defaults);
}
/**
* Quick meta tags generator
*/
export function generateMeta(options = {}) {
const builder = new MetaBuilder(options.defaults);
if (options.title) {
builder.title(options.title, { template: options.titleTemplate });
}
if (options.description) {
builder.description(options.description);
}
if (options.canonical) {
builder.canonical(options.canonical);
}
if (options.keywords) {
builder.keywords(options.keywords);
}
if (options.image) {
builder.image(options.image.url, options.image);
}
Iif (options.robots) {
builder.robots(options.robots);
}
Iif (options.article) {
builder.article(options.article);
}
Eif (options.twitterCard !== false) {
builder.twitterCard(options.twitterCard);
}
if (options.locale) {
builder.locale(options.locale, options.alternateLocales);
}
if (options.siteName) {
builder.siteName(options.siteName);
}
return builder.build();
}
export default {
MetaBuilder,
createMetaBuilder,
generateMeta
};
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