Add an SSHPublicKey class

package/yast2-users.spec

@@ -38,6 +38,7 @@ BuildRequires:  yast2-perl-bindings
 BuildRequires:  yast2-security
 BuildRequires:  yast2-testsuite
 BuildRequires:  rubygem(%rb_default_ruby_abi:rspec)
+BuildRequires:  openssh
 
 Requires:       cracklib
 Requires:       perl-Digest-SHA1
@@ -63,6 +64,7 @@ Requires:       yast2 >= 3.2.8
 Requires:       yast2-core >= 2.21.0
 
 Requires:       yast2-ruby-bindings >= 1.0.0
+Requires:       openssh
 
 Summary:        YaST2 - User and Group Configuration
 License:        GPL-2.0-only

src/Makefile.am

@@ -70,6 +70,7 @@ ylib_DATA = \
   lib/users/encryption_method.rb \
   lib/users/leaf_blk_device.rb \
   lib/users/proposal.rb \
+  lib/users/ssh_public_key.rb \
   lib/users/encryption_proposal.rb \
   lib/users/ssh_authorized_keys_file.rb \
   lib/users/ssh_authorized_keyring.rb \

src/lib/users/ssh_public_key.rb

@@ -0,0 +1,69 @@
+# encoding: utf-8
+
+# Copyright (c) [2018] SUSE LLC
+#
+# All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of version 2 of the GNU General Public License as published
+# by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, contact SUSE LLC.
+#
+# To contact SUSE LLC about this file by physical or electronic mail, you may
+# find current contact information at www.suse.com.
+
+require "yast2/execute"
+
+module Y2Users
+  # This class is a simplified representation of a OpenSSH public key.
+  #
+  # @example Read a public key
+  #   key = Y2Users::SSHPublicKey.new(File.read("id_rsa.pub"))
+  #   key.fingerprint # => "SHA256:uadPyDQj9VlFZVjK8UNp57jOnWwzGgKQJpeJEhZyV0I"
+  class SSHPublicKey
+    # Not a valid SSH public key
+    class InvalidKey < StandardError; end
+
+    # @return [String] Key fingerprint
+    attr_reader :fingerprint
+
+    # Constructor
+    #
+    # @param raw [String] Public key content
+    #
+    # @raise InvalidKey
+    def initialize(raw)
+      @fingerprint = fingerprint_from(raw)
+      @raw = raw.strip
+    end
+
+    # Returns the key comment
+    #
+    # @return [String] Comment field
+    def comment
+      @comment ||= @raw.split(" ").last
+    end
+
+  private
+
+    # Gets the fingerprint for the given OpenSSH public key
+    #
+    # @return [String] Key fingerprint
+    # @raise InvalidKey
+    def fingerprint_from(raw)
+      output = Yast::Execute.locally!(
+        ["echo", raw], ["ssh-keygen", "-l", "-f", "/dev/stdin"], stdout: :capture
+      )
+      output.split(" ")[1].to_s
+    rescue Cheetah::ExecutionFailed
+      raise InvalidKey
+    end
+  end
+end

test/Makefile.am

@@ -5,6 +5,7 @@ TESTS = \
   lib/users/ssh_authorized_keys_file_test.rb \
   lib/users/users_database_test.rb \
   lib/users/leaf_blk_device_test.rb \
+  lib/users/ssh_public_key_test.rb \
   lib/users/widgets/disk_selector_test.rb \
   lib/users/widgets/public_key_selector_test.rb \
   dialogs_test.rb \

test/lib/users/ssh_public_key_test.rb

@@ -0,0 +1,51 @@
+#!/usr/bin/env rspec
+# encoding: utf-8
+
+# Copyright (c) [2018] SUSE LLC
+#
+# All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of version 2 of the GNU General Public License as published
+# by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, contact SUSE LLC.
+#
+# To contact SUSE LLC about this file by physical or electronic mail, you may
+# find current contact information at www.suse.com.
+
+require_relative "../../test_helper"
+require "users/ssh_public_key"
+
+describe Y2Users::SSHPublicKey do
+  subject(:key) { described_class.new(File.read(path)) }
+  let(:path) { FIXTURES_PATH.join("id_rsa.pub") }
+
+  describe ".new" do
+    context "when the key is not valid" do
+      let(:content) { "some-not-valid-key" }
+
+      it "raises an InvalidKey error" do
+        expect { described_class.new(content) }.to raise_error(Y2Users::SSHPublicKey::InvalidKey)
+      end
+    end
+  end
+
+  describe "#fingerprint" do
+    it "returns the key fingerprint" do
+      expect(subject.fingerprint).to eq("SHA256:uadPyDQj9VlFZVjK8UNp57jOnWwzGgKQJpeJEhZyV0I")
+    end
+  end
+
+  describe "#comment" do
+    it "returns the key comment" do
+      expect(key.comment).to eq("dummy1@example.net")
+    end
+  end
+end