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Add alt text for preview card thumbnails (#26184)

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th-downstream
Christian Schmidt 1 year ago committed by GitHub
parent ca19ea30d4
commit 8da99ffb0d
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GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 250 additions and 92 deletions
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5
app/javascript/mastodon/features/explore/components/story.jsx
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@ -22,6 +22,7 @@ export default class Story extends PureComponent {
author: PropTypes.string,
sharedTimes: PropTypes.number,
thumbnail: PropTypes.string,
thumbnailDescription: PropTypes.string,
blurhash: PropTypes.string,
expanded: PropTypes.bool,
};
@ -33,7 +34,7 @@ export default class Story extends PureComponent {
handleImageLoad = () => this.setState({ thumbnailLoaded: true });
render () {
const { expanded, url, title, lang, publisher, author, publishedAt, sharedTimes, thumbnail, blurhash } = this.props;
const { expanded, url, title, lang, publisher, author, publishedAt, sharedTimes, thumbnail, thumbnailDescription, blurhash } = this.props;
const { thumbnailLoaded } = this.state;
@ -49,7 +50,7 @@ export default class Story extends PureComponent {
{thumbnail ? (
<>
<div className={classNames('story__thumbnail__preview', { 'story__thumbnail__preview--hidden': thumbnailLoaded })}><Blurhash hash={blurhash} /></div>
<img src={thumbnail} onLoad={this.handleImageLoad} alt='' role='presentation' />
<img src={thumbnail} onLoad={this.handleImageLoad} alt={thumbnailDescription} title={thumbnailDescription} lang={lang} />
</>
) : <Skeleton />}
</div>

1
app/javascript/mastodon/features/explore/links.jsx
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@ -67,6 +67,7 @@ class Links extends PureComponent {
author={link.get('author_name')}
sharedTimes={link.getIn(['history', 0, 'accounts']) * 1 + link.getIn(['history', 1, 'accounts']) * 1}
thumbnail={link.get('image')}
thumbnailDescription={link.get('image_description')}
blurhash={link.get('blurhash')}
/>
))}

3
app/javascript/mastodon/features/status/components/card.jsx
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@ -167,7 +167,8 @@ export default class Card extends PureComponent {
/>
);
let thumbnail = <img src={card.get('image')} alt='' style={thumbnailStyle} onLoad={this.handleImageLoad} className='status-card__image-image' />;
const thumbnailDescription = card.get('image_description');
const thumbnail = <img src={card.get('image')} alt={thumbnailDescription} title={thumbnailDescription} lang={language} style={thumbnailStyle} onLoad={this.handleImageLoad} className='status-card__image-image' />;
let spoilerButton = (
<button type='button' onClick={this.handleReveal} className='spoiler-button__overlay'>

5
app/lib/link_details_extractor.rb
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@ -113,6 +113,7 @@ class LinkDetailsExtractor
title: title || '',
description: description || '',
image_remote_url: image,
image_description: image_alt || '',
type: type,
link_type: link_type,
width: width || 0,
@ -168,6 +169,10 @@ class LinkDetailsExtractor
valid_url_or_nil(opengraph_tag('og:image'))
end
def image_alt
opengraph_tag('og:image:alt')
end
def canonical_url
valid_url_or_nil(link_tag('canonical') || opengraph_tag('og:url'), same_origin_only: true) || @original_url.to_s
end

1
app/models/preview_card.rb
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@ -31,6 +31,7 @@
# trendable :boolean
# link_type :integer
# published_at :datetime
# image_description :string default(""), not null
#
class PreviewCard < ApplicationRecord

2
app/serializers/rest/preview_card_serializer.rb
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@ -6,7 +6,7 @@ class REST::PreviewCardSerializer < ActiveModel::Serializer
attributes :url, :title, :description, :language, :type,
:author_name, :author_url, :provider_name,
:provider_url, :html, :width, :height,
:image, :embed_url, :blurhash, :published_at
:image, :image_description, :embed_url, :blurhash, :published_at
def image
object.image? ? full_asset_url(object.image.url(:original)) : nil

17
db/migrate/20230725213448_add_image_description_to_preview_cards.rb
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@ -0,0 +1,17 @@
# frozen_string_literal: true
require Rails.root.join('lib', 'mastodon', 'migration_helpers')
class AddImageDescriptionToPreviewCards < ActiveRecord::Migration[7.0]
include Mastodon::MigrationHelpers
disable_ddl_transaction!
def up
safety_assured { add_column_with_default :preview_cards, :image_description, :string, default: '', allow_null: false }
end
def down
remove_column :preview_cards, :image_description
end
end

1
db/schema.rb
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@ -802,6 +802,7 @@ ActiveRecord::Schema[7.0].define(version: 2023_08_03_112520) do
t.boolean "trendable"
t.integer "link_type"
t.datetime "published_at"
t.string "image_description", default: "", null: false
t.index ["url"], name: "index_preview_cards_on_url", unique: true
end

307
spec/lib/link_details_extractor_spec.rb
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@ -3,33 +3,31 @@
require 'rails_helper'
RSpec.describe LinkDetailsExtractor do
subject { described_class.new(original_url, html, html_charset) }
subject { described_class.new(original_url, html, nil) }
let(:original_url) { '' }
let(:html) { '' }
let(:html_charset) { nil }
let(:original_url) { 'https://example.com/dog.html?tracking=123' }
describe '#canonical_url' do
let(:original_url) { 'https://foo.com/article?bar=baz123' }
let(:html) { "<!doctype html><link rel='canonical' href='#{url}'>" }
context 'when canonical URL points to another host' do
let(:html) { '<!doctype html><link rel="canonical" href="https://bar.com/different-article" />' }
context 'when canonical URL points to the same host' do
let(:url) { 'https://example.com/dog.html' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq original_url
expect(subject.canonical_url).to eq 'https://example.com/dog.html'
end
end
context 'when canonical URL points to the same host' do
let(:html) { '<!doctype html><link rel="canonical" href="https://foo.com/article" />' }
context 'when canonical URL points to another host' do
let(:url) { 'https://different.example.net/dog.html' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq 'https://foo.com/article'
expect(subject.canonical_url).to eq original_url
end
end
context 'when canonical URL is set to "null"' do
let(:html) { '<!doctype html><link rel="canonical" href="null" />' }
let(:url) { 'null' }
it 'ignores the canonical URLs' do
expect(subject.canonical_url).to eq original_url
@ -37,124 +35,257 @@ RSpec.describe LinkDetailsExtractor do
end
end
context 'when structured data is present' do
let(:original_url) { 'https://example.com/page.html' }
context 'when only basic metadata is present' do
let(:html) { <<~HTML }
<!doctype html>
<html lang="en">
<head>
<title>Man bites dog</title>
<meta name="description" content="A dog&#39;s tale">
</head>
</html>
HTML
context 'when is wrapped in CDATA tags' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<head>
<script type="application/ld+json">
//<![CDATA[
{"@context":"http://schema.org","@type":"NewsArticle","mainEntityOfPage":"https://example.com/page.html","headline":"Foo","datePublished":"2022-01-31T19:53:00+00:00","url":"https://example.com/page.html","description":"Bar","author":{"@type":"Person","name":"Hoge"},"publisher":{"@type":"Organization","name":"Baz"}}
//]]>
</script>
</head>
</html>
HTML
describe '#title' do
it 'returns the title from title tag' do
expect(subject.title).to eq 'Man bites dog'
end
end
describe '#description' do
it 'returns the description from meta tag' do
expect(subject.description).to eq "A dog's tale"
end
end
describe '#language' do
it 'returns the language from lang attribute' do
expect(subject.language).to eq 'en'
end
end
end
context 'when structured data is present' do
let(:ld_json) do
{
'@context' => 'https://schema.org',
'@type' => 'NewsArticle',
'headline' => 'Man bites dog',
'description' => "A dog's tale",
'datePublished' => '2022-01-31T19:53:00+00:00',
'author' => {
'@type' => 'Organization',
'name' => 'Charlie Brown',
},
'publisher' => {
'@type' => 'NewsMediaOrganization',
'name' => 'Pet News',
'url' => 'https://example.com',
},
}.to_json
end
shared_examples 'structured data' do
describe '#title' do
it 'returns the title from structured data' do
expect(subject.title).to eq 'Foo'
expect(subject.title).to eq 'Man bites dog'
end
end
describe '#description' do
it 'returns the description from structured data' do
expect(subject.description).to eq 'Bar'
expect(subject.description).to eq "A dog's tale"
end
end
describe '#provider_name' do
it 'returns the provider name from structured data' do
expect(subject.provider_name).to eq 'Baz'
describe '#published_at' do
it 'returns the publicaton time from structured data' do
expect(subject.published_at).to eq '2022-01-31T19:53:00+00:00'
end
end
describe '#author_name' do
it 'returns the author name from structured data' do
expect(subject.author_name).to eq 'Hoge'
expect(subject.author_name).to eq 'Charlie Brown'
end
end
describe '#provider_name' do
it 'returns the provider name from structured data' do
expect(subject.provider_name).to eq 'Pet News'
end
end
end
context 'when is wrapped in CDATA tags' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<head>
<script type="application/ld+json">
//<![CDATA[
#{ld_json}
//]]>
</script>
</head>
</html>
HTML
include_examples 'structured data'
end
context 'with the first tag is invalid JSON' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<body>
<script type="application/ld+json">
{
"@context":"https://schema.org",
"@type":"ItemList",
"url":"https://example.com/page.html",
"name":"Foo",
"description":"Bar"
},
{
"@context": "https://schema.org",
"@type": "BreadcrumbList",
"itemListElement":[
{
"@type":"ListItem",
"position":1,
"item":{
"@id":"https://www.example.com",
"name":"Baz"
}
}
]
}
invalid LD+JSON
</script>
<script type="application/ld+json">
{
"@context":"https://schema.org",
"@type":"NewsArticle",
"mainEntityOfPage": {
"@type":"WebPage",
"@id": "http://example.com/page.html"
},
"headline": "Foo",
"description": "Bar",
"datePublished": "2022-01-31T19:46:00+00:00",
"author": {
"@type": "Organization",
"name": "Hoge"
#{ld_json}
</script>
</body>
</html>
HTML
include_examples 'structured data'
end
context 'with preceding block of unsupported LD+JSON' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<body>
<script type="application/ld+json">
[
{
"@context": "https://schema.org",
"@type": "ItemList",
"url": "https://example.com/cat.html",
"name": "Man bites cat",
"description": "A cat's tale"
},
"publisher": {
"@type": "NewsMediaOrganization",
"name":"Baz",
"url":"https://example.com/"
{
"@context": "https://schema.org",
"@type": "BreadcrumbList",
"itemListElement":[
{
"@type": "ListItem",
"position": 1,
"item": {
"@id": "https://www.example.com",
"name": "Cat News"
}
}
]
}
}
]
</script>
<script type="application/ld+json">
#{ld_json}
</script>
</body>
</html>
HTML
describe '#title' do
it 'returns the title from structured data' do
expect(subject.title).to eq 'Foo'
end
include_examples 'structured data'
end
context 'with unsupported in same block LD+JSON' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<body>
<script type="application/ld+json">
[
{
"@context": "https://schema.org",
"@type": "ItemList",
"url": "https://example.com/cat.html",
"name": "Man bites cat",
"description": "A cat's tale"
},
#{ld_json}
]
</script>
</body>
</html>
HTML
include_examples 'structured data'
end
end
context 'when Open Graph protocol data is present' do
let(:html) { <<~HTML }
<!doctype html>
<html>
<head>
<meta property="og:url" content="https://example.com/dog.html">
<meta property="og:title" content="Man bites dog">
<meta property="og:description" content="A dog's tale">
<meta property="article:published_time" content="2022-01-31T19:53:00+00:00">
<meta property="og:author" content="Charlie Brown">
<meta property="og:locale" content="en">
<meta property="og:image" content="https://example.com/snoopy.jpg">
<meta property="og:image:alt" content="A good boy">
<meta property="og:site_name" content="Pet News">
</head>
</html>
HTML
describe '#canonical_url' do
it 'returns the URL from Open Graph protocol data' do
expect(subject.canonical_url).to eq 'https://example.com/dog.html'
end
end
describe '#description' do
it 'returns the description from structured data' do
expect(subject.description).to eq 'Bar'
end
describe '#title' do
it 'returns the title from Open Graph protocol data' do
expect(subject.title).to eq 'Man bites dog'
end
end
describe '#provider_name' do
it 'returns the provider name from structured data' do
expect(subject.provider_name).to eq 'Baz'
end
describe '#description' do
it 'returns the description from Open Graph protocol data' do
expect(subject.description).to eq "A dog's tale"
end
end
describe '#author_name' do
it 'returns the author name from structured data' do
expect(subject.author_name).to eq 'Hoge'
end
describe '#published_at' do
it 'returns the publicaton time from Open Graph protocol data' do
expect(subject.published_at).to eq '2022-01-31T19:53:00+00:00'
end
end
describe '#author_name' do
it 'returns the author name from Open Graph protocol data' do
expect(subject.author_name).to eq 'Charlie Brown'
end
end
describe '#language' do
it 'returns the language from Open Graph protocol data' do
expect(subject.language).to eq 'en'
end
end
describe '#image' do
it 'returns the image from Open Graph protocol data' do
expect(subject.image).to eq 'https://example.com/snoopy.jpg'
end
end
describe '#image:alt' do
it 'returns the image description from Open Graph protocol data' do
expect(subject.image_alt).to eq 'A good boy'
end
end
describe '#provider_name' do
it 'returns the provider name from Open Graph protocol data' do
expect(subject.provider_name).to eq 'Pet News'
end
end
end

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