Add validate_email_address function

lib/puppet/parser/functions/is_email_address.rb

@@ -0,0 +1,21 @@
+#
+# is_email_address.rb
+#
+
+module Puppet::Parser::Functions
+  newfunction(:is_email_address, type: :rvalue, doc: <<-EOS
+Returns true if the string passed to this function is a valid email address.
+    EOS
+             ) do |arguments|
+    if arguments.size != 1
+      raise(Puppet::ParseError, 'is_email_address(): Wrong number of arguments '\
+        "given #{arguments.size} for 1")
+    end
+
+    # Taken from http://emailregex.com/ (simpler regex)
+    valid_email_regex = %r{\A([\w+\-].?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z}
+    return (arguments[0] =~ valid_email_regex) == 0
+  end
+end
+
+# vim: set ts=2 sw=2 et :

lib/puppet/parser/functions/validate_email_address.rb

@@ -0,0 +1,31 @@
+module Puppet::Parser::Functions
+  newfunction(:validate_email_address, doc: <<-ENDHEREDOC
+    Validate that all values passed are valid email addresses.
+    Fail compilation if any value fails this check.
+    The following values will pass:
+    $my_email = "[email protected]"
+    validate_email_address($my_email)
+    validate_email_address("[email protected]", "[email protected]", $my_email)
+
+    The following values will fail, causing compilation to abort:
+    $some_array = [ 'bad_email@/d/efdf.com' ]
+    validate_email_address($some_array)
+    ENDHEREDOC
+             ) do |args|
+    rescuable_exceptions = [ArgumentError]
+
+    if args.empty?
+      raise Puppet::ParseError, "validate_email_address(): wrong number of arguments (#{args.length}; must be > 0)"
+    end
+
+    args.each do |arg|
+      raise Puppet::ParseError, "#{arg.inspect} is not a string." unless arg.is_a?(String)
+
+      begin
+        raise Puppet::ParseError, "#{arg.inspect} is not a valid email address" unless function_is_email_address([arg])
+      rescue *rescuable_exceptions
+        raise Puppet::ParseError, "#{arg.inspect} is not a valid email address"
+      end
+    end
+  end
+end

spec/functions/is_email_address_spec.rb

@@ -0,0 +1,14 @@
+require 'spec_helper'
+
+describe 'is_email_address' do
+  it { is_expected.not_to eq(nil) }
+  it { is_expected.to run.with_params().and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
+  it { is_expected.to run.with_params([], []).and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
+  it { is_expected.to run.with_params('[email protected]').and_return(true) }
+  it { is_expected.to run.with_params('[email protected]').and_return(true) }
+  it { is_expected.to run.with_params('[email protected]').and_return(true) }
+  it { is_expected.to run.with_params('1.2.3@domain').and_return(false) }
+  it { is_expected.to run.with_params('1.2.3.4.5@').and_return(false) }
+  it { is_expected.to run.with_params({}).and_return(false) }
+  it { is_expected.to run.with_params([]).and_return(false) }
+end

spec/functions/validate_email_address_spec.rb

@@ -0,0 +1,23 @@
+require 'spec_helper'
+
+describe 'validate_email_address' do
+  describe 'signature validation' do
+    it { is_expected.not_to eq(nil) }
+    it { is_expected.to run.with_params().and_raise_error(Puppet::ParseError, /wrong number of arguments/i) }
+  end
+
+  describe 'valid inputs' do
+    it { is_expected.to run.with_params('[email protected]') }
+    it { is_expected.to run.with_params('[email protected]') }
+  end
+
+  describe 'invalid inputs' do
+    it { is_expected.to run.with_params({}).and_raise_error(Puppet::ParseError, /is not a string/) }
+    it { is_expected.to run.with_params(1).and_raise_error(Puppet::ParseError, /is not a string/) }
+    it { is_expected.to run.with_params(true).and_raise_error(Puppet::ParseError, /is not a string/) }
+    it { is_expected.to run.with_params('one').and_raise_error(Puppet::ParseError, /is not a valid email/) }
+    it { is_expected.to run.with_params('[email protected]', {}).and_raise_error(Puppet::ParseError, /is not a string/) }
+    it { is_expected.to run.with_params('[email protected]', true).and_raise_error(Puppet::ParseError, /is not a string/) }
+    it { is_expected.to run.with_params('[email protected]', 'one').and_raise_error(Puppet::ParseError, /is not a valid email/) }
+  end
+end