discourse/lib/file_store/s3_store.rb

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require "uri"
require_dependency "file_store/base_store"
require_dependency "file_store/local_store"
require_dependency "s3_helper"
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require_dependency "file_helper"
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module FileStore
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class S3Store < BaseStore
TOMBSTONE_PREFIX ||= "tombstone/"
def initialize(s3_helper=nil)
@s3_helper = s3_helper || S3Helper.new(s3_bucket, TOMBSTONE_PREFIX)
end
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def store_upload(file, upload, content_type = nil)
path = get_path_for_upload(upload)
store_file(file, path, filename: upload.original_filename, content_type: content_type, cache_locally: true)
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end
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# options
# - filename
# - content_type
# - cache_locally
def store_file(file, path, opts={})
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filename = opts[:filename].presence
content_type = opts[:content_type].presence
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# cache file locally when needed
cache_file(file, File.basename(path)) if opts[:cache_locally]
# stored uploaded are public by default
options = { acl: "public-read" }
# add a "content disposition" header for "attachments"
options[:content_disposition] = "attachment; filename=\"#{filename}\"" if filename && !FileHelper.is_image?(filename)
# add a "content type" header when provided
options[:content_type] = content_type if content_type
# if this fails, it will throw an exception
@s3_helper.upload(file, path, options)
# return the upload url
"#{absolute_base_url}/#{path}"
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end
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def remove_file(url)
return unless has_been_uploaded?(url)
filename = File.basename(url)
# copy the removed file to tombstone
@s3_helper.remove(filename, true)
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end
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def has_been_uploaded?(url)
return false if url.blank?
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base_hostname = URI.parse(absolute_base_url).hostname
return true if url[base_hostname]
return false if SiteSetting.s3_cdn_url.blank?
cdn_hostname = URI.parse(SiteSetting.s3_cdn_url || "").hostname
cdn_hostname.presence && url[cdn_hostname]
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end
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def absolute_base_url
# cf. http://docs.aws.amazon.com/general/latest/gr/rande.html#s3_region
@absolute_base_url ||= if SiteSetting.s3_region == "us-east-1"
"//#{s3_bucket}.s3.amazonaws.com"
else
"//#{s3_bucket}.s3-#{SiteSetting.s3_region}.amazonaws.com"
end
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end
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def external?
true
end
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def purge_tombstone(grace_period)
@s3_helper.update_tombstone_lifecycle(grace_period)
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end
def path_for(upload)
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url = upload.try(:url)
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FileStore::LocalStore.new.path_for(upload) if url && url[/^\/[^\/]/]
end
def cdn_url(url)
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return url if SiteSetting.s3_cdn_url.blank?
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schema = url[/^(https?:)?\/\//, 1]
url.sub("#{schema}#{absolute_base_url}", SiteSetting.s3_cdn_url)
end
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def cache_avatar(avatar, user_id)
source = avatar.url.sub(absolute_base_url + "/", "")
destination = avatar_template(avatar, user_id).sub(absolute_base_url + "/", "")
@s3_helper.copy(source, destination)
end
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def avatar_template(avatar, user_id)
UserAvatar.external_avatar_url(user_id, avatar.upload_id, avatar.width)
end
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def s3_bucket
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@s3_bucket ||= begin
raise Discourse::SiteSettingMissing.new("s3_upload_bucket") if SiteSetting.s3_upload_bucket.blank?
SiteSetting.s3_upload_bucket.downcase
end
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end
end
end