2018-09-24 23:50:39 +02:00
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import React, { Component } from 'react'
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import PropTypes from 'prop-types'
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import { StaticQuery, graphql } from 'gatsby'
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import Helmet from 'react-helmet'
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const query = graphql`
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query {
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contentYaml {
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title
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tagline
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url
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author {
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name
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twitter
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avatar {
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childImageSharp {
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resize(width: 160) {
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src
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}
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}
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}
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}
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}
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}
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`
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class SEO extends Component {
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static propTypes = {
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post: PropTypes.object,
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slug: PropTypes.string,
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postSEO: PropTypes.bool
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}
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render() {
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return (
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<StaticQuery
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query={query}
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render={data => {
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const siteMeta = data.contentYaml
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const { post, slug, postSEO } = this.props
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let title
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let description
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let image
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let postURL
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if (postSEO) {
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const postMeta = post.frontmatter
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title = `${postMeta.title} ¦ ${siteMeta.tagline}`
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description = postMeta.description
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? postMeta.description
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: post.excerpt
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2018-09-25 00:34:12 +02:00
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image = postMeta.image
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? postMeta.image.childImageSharp.fluid.src
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: siteMeta.author.avatar.childImageSharp.resize.src
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2018-09-24 23:50:39 +02:00
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postURL = `${siteMeta.url}${slug}`
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} else {
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title = `${siteMeta.title} ¦ ${siteMeta.tagline}`
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description = siteMeta.tagline
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image = siteMeta.author.avatar.childImageSharp.resize.src
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}
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image = `${siteMeta.url}${image}`
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const blogURL = siteMeta.url
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const url = postSEO ? postURL : blogURL
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const schemaOrgJSONLD = [
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{
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'@context': 'http://schema.org',
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'@type': 'WebSite',
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url: blogURL,
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name: title,
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alternateName: siteMeta.titleAlt ? siteMeta.titleAlt : ''
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}
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]
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if (postSEO) {
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schemaOrgJSONLD.push(
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{
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'@context': 'http://schema.org',
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'@type': 'BreadcrumbList',
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itemListElement: [
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{
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'@type': 'ListItem',
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position: 1,
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item: {
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'@id': postURL,
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name: title,
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image
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}
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}
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]
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},
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{
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'@context': 'http://schema.org',
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'@type': 'BlogPosting',
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url: blogURL,
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name: title,
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alternateName: siteMeta.titleAlt ? siteMeta.titleAlt : '',
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headline: title,
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image: {
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'@type': 'ImageObject',
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url: image
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},
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description
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}
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)
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}
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return (
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<Helmet>
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<html lang="en" />
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{/* General tags */}
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<meta name="description" content={description} />
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<meta name="image" content={image} />
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<link rel="canonical" href={url} />
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{/* Schema.org tags */}
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<script type="application/ld+json">
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{JSON.stringify(schemaOrgJSONLD)}
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</script>
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{/* OpenGraph tags */}
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<meta property="og:url" content={url} />
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{postSEO && <meta property="og:type" content="article" />}
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<meta property="og:title" content={title} />
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<meta property="og:description" content={description} />
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<meta property="og:image" content={image} />
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{/* Twitter Card tags */}
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<meta name="twitter:card" content="summary_large_image" />
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<meta
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name="twitter:creator"
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content={siteMeta.author.twitter ? siteMeta.author.twitter : ''}
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/>
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<meta name="twitter:title" content={title} />
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<meta name="twitter:description" content={description} />
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<meta name="twitter:image" content={image} />
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</Helmet>
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)
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}}
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/>
|
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)
|
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}
|
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}
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export default SEO
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