Class: SelfSDK::SignatureGraph

Inherits:
Object
  • Object
show all
Defined in:
lib/signature_graph.rb

Instance Method Summary collapse

Constructor Details

#initialize(history) ⇒ SignatureGraph

Returns a new instance of SignatureGraph.



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# File 'lib/signature_graph.rb', line 100

def initialize(history)
  @root = nil
  @keys = Hash.new
  @devices = Hash.new
  @signatures = Hash.new
  @operations = Array.new
  @recovery_key = nil

  history.each do |operation|
    execute(operation)
  end
end

Instance Method Details

#execute(operation) ⇒ Object 



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# File 'lib/signature_graph.rb', line 125

def execute(operation)
  op = Operation.new(operation)

  raise "operation sequence is out of order" if op.sequence != @operations.length

  if op.sequence > 0
    if @signatures[op.previous] != op.sequence - 1
      raise "operation previous signature does not match"
    end

    if @operations[op.sequence - 1].timestamp >= op.timestamp
      raise "operation timestamp occurs before previous operation"
    end

    sk = @keys[op.signing_key]

    raise "operation specifies a signing key that does not exist" if sk.nil?

    if sk.revoked? && op.timestamp > sk.revoked
      raise "operation was signed by a key that was revoked at the time of signing"
    end

    if sk.type == KEY_TYPE_RECOVERY && op.revokes(op.signing_key) != true
      raise "account recovery operation does not revoke the current active recovery key"
    end
  end

  execute_actions(op)

  sk = @keys[op.signing_key]

  raise "operation specifies a signing key that does not exist" if sk.nil?

  if op.timestamp < sk.created || sk.revoked? && op.timestamp > sk.revoked
    raise "operation was signed with a key that was revoked"
  end

  sig = Base64.urlsafe_decode64(op.jws[:signature])

  sk.public_key.verify(sig, "#{op.jws[:protected]}.#{op.jws[:payload]}")

  has_valid_key = false

  @keys.each do |kid, k|
    has_valid_key = true unless k.revoked?
  end

  raise "signature graph does not contain any active or valid keys" unless has_valid_key
  raise "signature graph does not contain a valid recovery key" if @recovery_key.nil?
  raise "signature graph does not contain a valid recovery key" if @recovery_key.revoked?

  @operations.push(op)
  @signatures[op.jws[:signature]] = op.sequence
end

#key_by_device(did) ⇒ Object 



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# File 'lib/signature_graph.rb', line 119

def key_by_device(did)
  k = @devices[did]
  raise "key not found" if k.nil?
  k
end

#key_by_id(kid) ⇒ Object 



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# File 'lib/signature_graph.rb', line 113

def key_by_id(kid)
  k = @keys[kid]
  raise "key not found" if k.nil?
  k
end