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media assets: add image redirect routes.

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Add URLs that redirect from a media asset to the image:

* https://danbooru.donmai.us/media_assets/6961761/original -> https://cdn.donmai.us/original/2c/4f/2c4ff193b0fc7106e59b2f6696a68a02.jpg
* https://danbooru.donmai.us/media_assets/6961761/sample   -> https://cdn.donmai.us/sample/2c/4f/sample-2c4ff193b0fc7106e59b2f6696a68a02.jpg
* https://danbooru.donmai.us/media_assets/6961761/720x720  -> https://cdn.donmai.us/180x180/2c/4f/2c4ff193b0fc7106e59b2f6696a68a02.webp
* https://danbooru.donmai.us/media_assets/6961761/360x360  -> https://cdn.donmai.us/180x180/2c/4f/2c4ff193b0fc7106e59b2f6696a68a02.jpg
* https://danbooru.donmai.us/media_assets/6961761/180x180  -> https://cdn.donmai.us/180x180/2c/4f/2c4ff193b0fc7106e59b2f6696a68a02.jpg

This is useful if you have a media asset ID and want to get to the image
without looking up the image URL in the API.

This endpoint is rate-limited to 5 requests per second. It's not meant
to be used for things like thumbnail galleries or bulk scraping images.
This commit is contained in:
evazion
2022-10-31 22:50:37 -05:00
parent b41b67af6c
commit ad998a8127
3 changed files with 17 additions and 1 deletions
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10
app/controllers/media_assets_controller.rb
View File

@@ -3,6 +3,8 @@
class MediaAssetsController < ApplicationController
respond_to :html, :json, :xml
rate_limit :image, rate: 5.0/1.seconds, burst: 50
def index
@limit = params.fetch(:limit, CurrentUser.user.per_page).to_i.clamp(0, PostSets::Post::MAX_PER_PAGE)
@preview_size = params[:size].presence || cookies[:post_preview_size].presence || MediaAssetGalleryComponent::DEFAULT_SIZE
@@ -33,4 +35,12 @@ class MediaAssetsController < ApplicationController
respond_with(@media_asset)
end
end
def image
media_asset = authorize MediaAsset.find(params[:media_asset_id])
variant = media_asset.variant(params[:variant])
raise ActiveRecord::RecordNotFound if variant.nil?
redirect_to variant.file_url
end
end