discourse/db/migrate/20131014203951_backfill_pos...

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# frozen_string_literal: true
class BackfillPostUploadReverseIndex < ActiveRecord::Migration[4.2]
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def up
# clean the reverse index
execute "TRUNCATE TABLE post_uploads"
# fill the reverse index up
Post.select([:id, :cooked]).find_each do |post|
doc = Nokogiri::HTML5::fragment(post.cooked)
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# images
doc.search("img").each { |img| add_to_reverse_index(img['src'], post.id) }
# thumbnails and/or attachments
doc.search("a").each { |a| add_to_reverse_index(a['href'], post.id) }
end
end
def add_to_reverse_index(url, post_id)
# make sure we have a url to insert
return unless url.present?
# local uploads are relative
if index = url.index(local_base_url)
url = url[index..-1]
end
# filter out non-uploads
return unless is_local?(url) || is_on_s3?(url)
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# update the reverse index
execute "INSERT INTO post_uploads (upload_id, post_id)
SELECT u.id, #{post_id}
FROM uploads u
WHERE u.url = '#{url}'
AND NOT EXISTS (SELECT 1 FROM post_uploads WHERE upload_id = u.id AND post_id = #{post_id})"
end
def local_base_url
@local_base_url ||= "/uploads/#{RailsMultisite::ConnectionManagement.current_db}"
end
def local_optimized_base_url
@local_optimized_base_url ||= "#{local_base_url}/_optimized"
end
def local_avatar_base_url
@local_avatar_base_url ||= "#{local_base_url}/avatars"
end
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def s3_base_url
@s3_base_url ||= "//#{SiteSetting.s3_upload_bucket.downcase}.s3.amazonaws.com"
end
def s3_avatar_base_url
@s3_avatar_base_url ||= "#{s3_base_url}/avatars"
end
def is_local?(url)
url.starts_with?(local_base_url) && !is_local_thumbnail?(url) && !is_local_avatar?(url)
end
def is_local_thumbnail?(url)
url.starts_with?(local_optimized_base_url)
end
def is_local_avatar?(url)
url.starts_with?(local_avatar_base_url)
end
def is_on_s3?(url)
url.starts_with?(s3_base_url) && !is_s3_avatar?(url)
end
def is_s3_avatar?(url)
url.starts_with?(s3_avatar_base_url)
end
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end