discourse/app/jobs/regular/generate_avatars.rb

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require "image_sorcery"
module Jobs
class GenerateAvatars < Jobs::Base
def execute(args)
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raise Discourse::ImageMagickMissing.new unless system("command -v convert >/dev/null;")
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upload_id, user_id = args[:upload_id], args[:user_id]
raise Discourse::InvalidParameters.new(:upload_id) if upload_id.blank?
raise Discourse::InvalidParameters.new(:user_id) if user_id.blank?
upload = Upload.find_by(id: upload_id)
user = User.find_by(id: user_id)
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return if upload.nil? || user.nil?
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external_copy = Discourse.store.download(upload) if Discourse.store.external?
original_path = if Discourse.store.external?
external_copy.path
else
Discourse.store.path_for(upload)
end
source = original_path
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# extract the first frame when it's a gif
source << "[0]" unless SiteSetting.allow_animated_avatars
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image = ImageSorcery.new(source)
extension = File.extname(original_path)
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[120, 45, 32, 25, 20].each do |s|
# handle retina too
[s, s * 2].each do |size|
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begin
# create a temp file with the same extension as the original
temp_file = Tempfile.new(["discourse-avatar", extension])
# create a transparent centered square thumbnail
if image.convert(temp_file.path,
gravity: "center",
thumbnail: "#{size}x#{size}^",
extent: "#{size}x#{size}",
background: "transparent")
if Discourse.store.store_avatar(temp_file, upload, size).blank?
Rails.logger.error("Failed to store avatar #{size} for #{upload.url} from #{source}")
end
else
Rails.logger.error("Failed to create avatar #{size} for #{upload.url} from #{source}")
end
ensure
# close && remove temp file
temp_file && temp_file.close!
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end
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end
end
# make sure we remove the cached copy from external stores
external_copy.close! if Discourse.store.external?
# attach the avatar to the user
user.uploaded_avatar_template = Discourse.store.avatar_template(upload)
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user.save!
end
end
end