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03818e642a
This introduces new APIs for obtaining optimized thumbnails for topics. There are a few building blocks required for this:
- Introduces new `image_upload_id` columns on the `posts` and `topics` table. This replaces the old `image_url` column, which means that thumbnails are now restricted to uploads. Hotlinked thumbnails are no longer possible. In normal use (with pull_hotlinked_images enabled), this has no noticeable impact
- A migration attempts to match existing urls to upload records. If a match cannot be found then the posts will be queued for rebake
- Optimized thumbnails are generated during post_process_cooked. If thumbnails are missing when serializing a topic list, then a sidekiq job is queued
- Topic lists and topics now include a `thumbnails` key, which includes all the available images:
```
"thumbnails": [
{
"max_width": null,
"max_height": null,
"url": "//example.com/original-image.png",
"width": 1380,
"height": 1840
},
{
"max_width": 1024,
"max_height": 1024,
"url": "//example.com/optimized-image.png",
"width": 768,
"height": 1024
}
]
```
- Themes can request additional thumbnail sizes by using a modifier in their `about.json` file:
```
"modifiers": {
"topic_thumbnail_sizes": [
[200, 200],
[800, 800]
],
...
```
Remember that these are generated asynchronously, so your theme should include logic to fallback to other available thumbnails if your requested size has not yet been generated
- Two new raw plugin outlets are introduced, to improve the customisability of the topic list. `topic-list-before-columns` and `topic-list-before-link`
61 lines
2.3 KiB
Ruby
61 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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# This model indicates an 'attempt' to create a topic thumbnail
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# for an upload. This means we don't keep trying to create optimized
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# images for small/invalid original images.
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#
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# Foreign keys with ON DELETE CASCADE are used to ensure unneeded data
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# is deleted automatically
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class TopicThumbnail < ActiveRecord::Base
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belongs_to :upload
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belongs_to :optimized_image
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def self.find_or_create_for!(original, max_width: , max_height:)
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existing = TopicThumbnail.find_by(upload: original, max_width: max_width, max_height: max_height)
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return existing if existing
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return nil if !SiteSetting.create_thumbnails?
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target_width, target_height = ImageSizer.resize(original.width, original.height, { max_width: max_width, max_height: max_height })
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if target_width < original.width && target_height < original.height
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optimized = OptimizedImage.create_for(original, target_width, target_height)
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end
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create!(upload: original, max_width: max_width, max_height: max_height, optimized_image: optimized)
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end
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def self.ensure_consistency!
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# Clean up records for broken upload links or broken optimized image links
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TopicThumbnail
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.joins("LEFT JOIN uploads on upload_id = uploads.id")
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.joins("LEFT JOIN optimized_images on optimized_image_id = optimized_images.id")
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.where(<<~SQL)
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(optimized_image_id IS NOT NULL AND optimized_images IS NULL)
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OR uploads IS NULL
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SQL
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.delete_all
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# Delete records for sizes which are no longer needed
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sizes = Topic.thumbnail_sizes + ThemeModifierHelper.new(theme_ids: Theme.pluck(:id)).topic_thumbnail_sizes
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sizes_sql = sizes.map { |s| "(max_width = #{s[0].to_i} AND max_height = #{s[1].to_i})" }.join(" OR ")
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TopicThumbnail.where.not(sizes_sql).delete_all
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end
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end
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# == Schema Information
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#
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# Table name: topic_thumbnails
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#
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# id :bigint not null, primary key
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# upload_id :bigint not null
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# optimized_image_id :bigint
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# max_width :integer not null
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# max_height :integer not null
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#
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# Indexes
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#
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# index_topic_thumbnails_on_optimized_image_id (optimized_image_id)
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# index_topic_thumbnails_on_upload_id (upload_id)
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# unique_topic_thumbnails (upload_id,max_width,max_height) UNIQUE
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#
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