From 636c25dfb6280d5f81d8dde609d2c0fc264d41b8 Mon Sep 17 00:00:00 2001
From: Randy Schmidt <me@r38y.com>
Date: Wed, 22 Mar 2017 15:40:14 -0400
Subject: [PATCH] Don't explode when handling attachments with no content.

---
 lib/griddler/postmark/adapter.rb       | 10 +++++++++-
 spec/griddler/postmark/adapter_spec.rb | 13 +++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/lib/griddler/postmark/adapter.rb b/lib/griddler/postmark/adapter.rb
index d0d67a9..e284d35 100644
--- a/lib/griddler/postmark/adapter.rb
+++ b/lib/griddler/postmark/adapter.rb
@@ -65,10 +65,18 @@ def attachment_files
       def create_tempfile(attachment)
         filename = attachment[:Name].gsub(/\/|\\/, '_')
         tempfile = Tempfile.new(filename, Dir::tmpdir, encoding: 'ascii-8bit')
-        tempfile.write(Base64.decode64(attachment[:Content]))
+        tempfile.write(content(attachment))
         tempfile.rewind
         tempfile
       end
+
+      def content(attachment)
+        if content = attachment[:Content]
+          Base64.decode64(content)
+        else
+          content
+        end
+      end
     end
   end
 end
diff --git a/spec/griddler/postmark/adapter_spec.rb b/spec/griddler/postmark/adapter_spec.rb
index 1531896..e819ddd 100644
--- a/spec/griddler/postmark/adapter_spec.rb
+++ b/spec/griddler/postmark/adapter_spec.rb
@@ -79,6 +79,19 @@
     })
   end
 
+  it 'can handle a blank attachment content' do
+    params = default_params.merge({
+      Attachments: [
+        {
+          Name: "empty.gif",
+        }
+      ]
+    })
+    expect {
+      Griddler::Postmark::Adapter.normalize_params(params)
+    }.to_not raise_error
+  end
+
   def default_params
     {
       FromFull: {