discourse/lib/backup_restore/s3_backup_store.rb

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require_dependency "backup_restore/backup_store"
require_dependency "s3_helper"
module BackupRestore
class S3BackupStore < BackupStore
DOWNLOAD_URL_EXPIRES_AFTER_SECONDS ||= 15
UPLOAD_URL_EXPIRES_AFTER_SECONDS ||= 21_600 # 6 hours
MULTISITE_PREFIX = "backups"
def initialize(opts = {})
s3_options = S3Helper.s3_options(SiteSetting)
s3_options.merge!(opts[:s3_options]) if opts[:s3_options]
@s3_helper = S3Helper.new(s3_bucket_name_with_prefix, '', s3_options)
end
def remote?
true
end
def file(filename, include_download_source: false)
obj = @s3_helper.object(filename)
create_file_from_object(obj, include_download_source) if obj.exists?
end
def delete_file(filename)
obj = @s3_helper.object(filename)
if obj.exists?
obj.delete
reset_cache
end
end
def download_file(filename, destination_path, failure_message = nil)
unless @s3_helper.object(filename).download_file(destination_path)
raise failure_message&.to_s || "Failed to download file"
end
end
def upload_file(filename, source_path, content_type)
obj = @s3_helper.object(filename)
raise BackupFileExists.new if obj.exists?
obj.upload_file(source_path, content_type: content_type)
reset_cache
end
def generate_upload_url(filename)
obj = @s3_helper.object(filename)
raise BackupFileExists.new if obj.exists?
ensure_cors!
presigned_url(obj, :put, UPLOAD_URL_EXPIRES_AFTER_SECONDS)
end
private
def unsorted_files
objects = []
@s3_helper.list.each do |obj|
if obj.key.match?(/\.t?gz$/i)
objects << create_file_from_object(obj)
end
end
objects
rescue Aws::Errors::ServiceError => e
Rails.logger.warn("Failed to list backups from S3: #{e.message.presence || e.class.name}")
raise StorageError
end
def create_file_from_object(obj, include_download_source = false)
BackupFile.new(
filename: File.basename(obj.key),
size: obj.size,
last_modified: obj.last_modified,
source: include_download_source ? presigned_url(obj, :get, DOWNLOAD_URL_EXPIRES_AFTER_SECONDS) : nil
)
end
def presigned_url(obj, method, expires_in_seconds)
obj.presigned_url(method, expires_in: expires_in_seconds)
end
def ensure_cors!
rule = {
allowed_headers: ["*"],
allowed_methods: ["PUT"],
allowed_origins: [Discourse.base_url_no_prefix],
max_age_seconds: 3000
}
@s3_helper.ensure_cors!([rule])
end
def cleanup_allowed?
!SiteSetting.s3_disable_cleanup
end
def s3_bucket_name_with_prefix
if Rails.configuration.multisite
File.join(SiteSetting.s3_backup_bucket, MULTISITE_PREFIX, RailsMultisite::ConnectionManagement.current_db)
else
SiteSetting.s3_backup_bucket
end
end
def free_bytes
nil
end
end
end