1 files changed, 48 insertions, 0 deletions
diff --git a/app/models/pgp_key.rb b/app/models/pgp_key.rb
new file mode 100644
index 0000000..66f8660
--- /dev/null
+++ b/app/models/pgp_key.rb
@@ -0,0 +1,48 @@
+class PgpKey
+  include ActiveModel::Validations
+
+  KEYBLOCK_IDENTIFIERS = [
+    '-----BEGIN PGP PUBLIC KEY BLOCK-----',
+    '-----END PGP PUBLIC KEY BLOCK-----',
+  ]
+
+  # mostly for testing.
+  attr_accessor :keyblock
+
+  validate :validate_keyblock_format
+
+  def initialize(keyblock = nil)
+    @keyblock = keyblock
+  end
+
+  def to_s
+    @keyblock
+  end
+
+  def present?
+    @keyblock.present?
+  end
+
+  # allow comparison with plain keyblock strings.
+  def ==(other)
+    self.equal?(other) or
+    # relax the comparison on line ends.
+    self.to_s.tr_s("\n\r", '') == other.tr_s("\r\n", '')
+  end
+
+  protected
+
+  def validate_keyblock_format
+    if keyblock_identifier_missing?
+      errors.add :public_key_block,
+        "does not look like an armored pgp public key block"
+    end
+  end
+
+  def keyblock_identifier_missing?
+    KEYBLOCK_IDENTIFIERS.find do |identify|
+      !@keyblock.include?(identify)
+    end
+  end
+
+end