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|
# frozen_string_literal: true
require 'openssl'
# In this class we keep track of the state changes that the
# Converter makes as it scans through the log stream.
module Gitlab
module Ci
module Ansi2json
class State
include Gitlab::Utils::StrongMemoize
SIGNATURE_KEY_SALT = 'gitlab-ci-ansi2json-state'
SEPARATOR = '--'
attr_accessor :offset, :current_line, :inherited_style, :open_sections, :last_line_offset
def initialize(new_state, stream_size)
@offset = 0
@inherited_style = {}
@open_sections = {}
@stream_size = stream_size
restore_state!(new_state)
end
def encode
json = {
offset: @last_line_offset,
style: @current_line.style.to_h,
open_sections: @open_sections
}.to_json
encoded = Base64.urlsafe_encode64(json, padding: false)
encoded + SEPARATOR + sign(encoded)
end
def open_section(section, timestamp, options)
@open_sections[section] = timestamp
@current_line.add_section(section)
@current_line.set_section_options(options)
@current_line.set_as_section_header
end
def close_section(section, timestamp)
return unless section_open?(section)
duration = timestamp.to_i - @open_sections[section].to_i
@current_line.set_section_duration(duration)
@open_sections.delete(section)
end
def section_open?(section)
@open_sections.key?(section)
end
def new_line!(style: nil)
new_line = Line.new(
offset: @offset,
style: style || @current_line.style,
sections: @open_sections.keys
)
@current_line = new_line
end
def set_last_line_offset
@last_line_offset = @current_line.offset
end
def update_style(commands)
@current_line.flush_current_segment!
@current_line.update_style(commands)
end
private
def restore_state!(encoded_state)
state = decode_state(encoded_state)
return unless state
return if state['offset'].to_i > @stream_size
@offset = state['offset'].to_i if state['offset']
@open_sections = state['open_sections'] if state['open_sections']
if state['style']
@inherited_style = {
fg: state.dig('style', 'fg'),
bg: state.dig('style', 'bg'),
mask: state.dig('style', 'mask')
}
end
end
def decode_state(data)
return if data.blank?
encoded_state = verify(data)
if encoded_state.blank?
::Gitlab::AppLogger.warn(message: "#{self.class}: signature missing or invalid", invalid_state: data)
return
end
decoded_state = Base64.urlsafe_decode64(encoded_state)
return unless decoded_state.present?
::Gitlab::Json.parse(decoded_state)
end
def sign(message)
::OpenSSL::HMAC.hexdigest(
signature_digest,
signature_key,
message
)
end
def verify(signed_message)
signature_length = signature_digest.digest_length * 2 # a byte is exactly two hexadecimals
message_length = signed_message.length - SEPARATOR.length - signature_length
return if message_length <= 0
signature = signed_message.last(signature_length)
message = signed_message.first(message_length)
return unless valid_signature?(message, signature)
message
end
def valid_signature?(message, signature)
expected_signature = sign(message)
expected_signature.bytesize == signature.bytesize &&
::OpenSSL.fixed_length_secure_compare(signature, expected_signature)
end
def signature_digest
::OpenSSL::Digest.new('SHA256')
end
def signature_key
::Gitlab::Application.key_generator.generate_key(SIGNATURE_KEY_SALT, signature_digest.block_length)
end
strong_memoize_attr :signature_key
end
end
end
end
|
