add stamp field type

lib/pdf_icons.rb

@@ -9,14 +9,26 @@ module PdfIcons
   module_function
 
   def check_io
-    @check_io ||= StringIO.new(PATH.join('check.png').read)
+    StringIO.new(check_data)
   end
 
   def paperclip_io
-    @paperclip_io ||= StringIO.new(PATH.join('paperclip.png').read)
+    StringIO.new(paperclip_data)
   end
 
   def logo_io
-    @logo_io ||= StringIO.new(PATH.join('logo.png').read)
+    StringIO.new(logo_data)
+  end
+
+  def check_data
+    @check_data ||= PATH.join('check.png').read
+  end
+
+  def paperclip_data
+    @paperclip_data ||= PATH.join('paperclip.png').read
+  end
+
+  def logo_data
+    @logo_data ||= PATH.join('logo.png').read
   end
 end

lib/submissions/generate_audit_trail.rb

@@ -192,7 +192,7 @@ module Submissions
                 }
               ].compact_blank, line_spacing: 1.8, padding: [0, 0, 5, 0]
             ),
-            if field['type'].in?(%w[image signature initials])
+            if field['type'].in?(%w[image signature initials stamp])
               attachment = submitter.attachments.find { |a| a.uuid == value }
               image = Vips::Image.new_from_buffer(attachment.download, '').autorot
 

lib/submissions/generate_result_attachments.rb

@@ -67,7 +67,7 @@ module Submissions
           canvas.font(FONT_NAME, size: font_size)
 
           case field['type']
-          when 'image', 'signature', 'initials'
+          when 'image', 'signature', 'initials', 'stamp'
             attachment = submitter.attachments.find { |a| a.uuid == value }
 
             image = Vips::Image.new_from_buffer(attachment.download, '').autorot

lib/submitters/create_stamp_attachment.rb

@@ -0,0 +1,89 @@
+# frozen_string_literal: true
+
+module Submitters
+  module CreateStampAttachment
+    WIDTH = 400
+    HEIGHT = 200
+
+    TRANSPARENT_PIXEL = "\x89PNG\r\n\u001A\n\u0000\u0000\u0000\rIHDR\u0000" \
+                        "\u0000\u0000\u0001\u0000\u0000\u0000\u0001\b\u0004" \
+                        "\u0000\u0000\u0000\xB5\u001C\f\u0002\u0000\u0000\u0000" \
+                        "\vIDATx\xDAc\xFC_\u000F\u0000\u0002\x83\u0001\x804\xC3ڨ" \
+                        "\u0000\u0000\u0000\u0000IEND\xAEB`\x82"
+
+    module_function
+
+    def call(submitter)
+      image = generate_stamp_image(submitter)
+
+      image_data = image.write_to_buffer('.png')
+
+      checksum = Digest::MD5.base64digest(image_data)
+
+      attachment = submitter.attachments.joins(:blob).find_by(blob: { checksum: })
+
+      attachment || ActiveStorage::Attachment.create!(
+        blob: ActiveStorage::Blob.create_and_upload!(io: StringIO.new(image_data), filename: 'stamp.png'),
+        metadata: { analyzed: true, identified: true, width: image.width, height: image.height },
+        name: 'attachments',
+        record: submitter
+      )
+    end
+
+    # rubocop:disable Metrics
+    def generate_stamp_image(submitter)
+      logo = Vips::Image.new_from_buffer(load_logo(submitter).read, '')
+
+      logo = logo.resize([WIDTH / logo.width.to_f, HEIGHT / logo.height.to_f].min)
+
+      base_layer = Vips::Image.black(WIDTH, HEIGHT).new_from_image([255, 255, 255]).copy(interpretation: :srgb)
+
+      opacity_layer = Vips::Image.new_from_buffer(TRANSPARENT_PIXEL, '').resize(WIDTH)
+
+      text = build_text_image(submitter)
+
+      text_layer = text.new_from_image([0, 0, 0]).copy(interpretation: :srgb)
+      text_layer = text_layer.bandjoin(text)
+
+      base_layer = base_layer.composite(logo, 'over',
+                                        x: (WIDTH - logo.width) / 2,
+                                        y: (HEIGHT - logo.height) / 2)
+
+      base_layer = base_layer.composite(opacity_layer, 'over')
+
+      base_layer.composite(text_layer, 'over',
+                           x: (WIDTH - text_layer.width) / 2,
+                           y: (HEIGHT - text_layer.height) / 2)
+    end
+    # rubocop:enable Metrics
+
+    def build_text_image(submitter)
+      time = I18n.l(submitter.completed_at.in_time_zone(submitter.account.timezone), format: :long,
+                                                                                     locale: submitter.account.locale)
+
+      timezone = TimeUtils.timezone_abbr(submitter.account.timezone, submitter.completed_at)
+
+      name = if submitter.name.present? && submitter.email.present?
+               "#{submitter.name} #{submitter.email}"
+             else
+               submitter.name || submitter.email || submitter.phone
+             end
+
+      role = if submitter.submission.template_submitters.size > 1
+               item = submitter.submission.template_submitters.find { |e| e['uuid'] == submitter.uuid }
+
+               "Role: #{item['name']}\n"
+             else
+               ''
+             end
+
+      text = %(<span size="90">Digitally signed by: <b>#{name}</b>\n#{role}#{time} #{timezone}</span>)
+
+      Vips::Image.text(text, width: WIDTH, height: HEIGHT)
+    end
+
+    def load_logo(_submitter)
+      PdfIcons.logo_io
+    end
+  end
+end

lib/submitters/submit_values.rb

@@ -74,6 +74,12 @@ module Submitters
       default_values = submitter.submission.template_fields.each_with_object({}) do |field, acc|
         next if field['submitter_uuid'] != submitter.uuid
 
+        if field['type'] == 'stamp'
+          acc[field['uuid']] ||= Submitters::CreateStampAttachment.call(submitter).uuid
+
+          next
+        end
+
         value = field['default_value']
 
         next if value.blank?