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# frozen_string_literal: true
module BulkImports
module FileDownloads
module Validations
def raise_error(message)
raise NotImplementedError
end
def filepath
raise NotImplementedError
end
def file_size_limit
raise NotImplementedError
end
def response_headers
raise NotImplementedError
end
private
def validate_filepath
Gitlab::PathTraversal.check_path_traversal!(filepath)
end
def validate_content_type
content_type = response_headers['content-type']
raise_error('Invalid content type') if content_type.blank? || allowed_content_types.exclude?(content_type)
end
def validate_symlink
return unless File.lstat(filepath).symlink?
File.delete(filepath)
raise_error 'Invalid downloaded file'
end
def validate_content_length
validate_size!(response_headers['content-length'])
end
def validate_size!(size)
if size.blank?
raise_error 'Missing content-length header'
elsif size.to_i > file_size_limit
raise_error format(
"File size %{size} exceeds limit of %{limit}",
size: ActiveSupport::NumberHelper.number_to_human_size(size),
limit: ActiveSupport::NumberHelper.number_to_human_size(file_size_limit)
)
end
end
end
end
end
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