make pdf links clickable

Gemfile

@@ -20,6 +20,7 @@ gem 'oj'
 gem 'omniauth-google-oauth2'
 gem 'omniauth-rails_csrf_protection'
 gem 'pagy'
+gem 'pdf-reader'
 gem 'pg', require: false
 gem 'premailer-rails'
 gem 'puma'

Gemfile.lock

@@ -1,6 +1,7 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    Ascii85 (1.1.0)
     actioncable (7.0.7)
       actionpack (= 7.0.7)
       activesupport (= 7.0.7)
@@ -68,6 +69,7 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
+    afm (0.2.2)
     annotate (3.2.0)
       activerecord (>= 3.2, < 8.0)
       rake (>= 10.4, < 14.0)
@@ -233,6 +235,7 @@ GEM
       os (>= 0.9, < 2.0)
       signet (>= 0.16, < 2.a)
     hashdiff (1.0.1)
+    hashery (2.1.2)
     hashie (5.0.0)
     hexapdf (0.33.0)
       cmdparse (~> 3.0, >= 3.0.3)
@@ -335,6 +338,12 @@ GEM
     parser (3.2.2.3)
       ast (~> 2.4.1)
       racc
+    pdf-reader (2.11.0)
+      Ascii85 (~> 1.0)
+      afm (~> 0.2.1)
+      hashery (~> 2.0)
+      ruby-rc4
+      ttfunk
     pg (1.5.3)
     premailer (1.21.0)
       addressable
@@ -461,6 +470,7 @@ GEM
       rubocop-capybara (~> 2.17)
       rubocop-factory_bot (~> 2.22)
     ruby-progressbar (1.13.0)
+    ruby-rc4 (0.1.5)
     ruby-vips (2.1.4)
       ffi (~> 1.12)
     ruby2_keywords (0.0.5)
@@ -502,6 +512,7 @@ GEM
     thor (1.2.2)
     timeout (0.4.0)
     trailblazer-option (0.1.2)
+    ttfunk (1.7.0)
     turbo-rails (1.4.0)
       actionpack (>= 6.0.0)
       activejob (>= 6.0.0)
@@ -564,6 +575,7 @@ DEPENDENCIES
   omniauth-google-oauth2
   omniauth-rails_csrf_protection
   pagy
+  pdf-reader
   pg
   premailer-rails
   pry-rails

app/controllers/api/templates_documents_controller.rb

@@ -7,12 +7,7 @@ module Api
 
       @template = current_account.templates.find(params[:template_id])
 
-      documents =
-        find_or_create_blobs.map do |blob|
-          document = @template.documents.create!(blob:)
-
-          Templates::ProcessDocument.call(document)
-        end
+      documents = Templates::CreateAttachments.call(@template, params)
 
       schema = documents.map do |doc|
         { attachment_uuid: doc.uuid, name: doc.filename.base }
@@ -27,19 +22,5 @@ module Api
         )
       }
     end
-
-    private
-
-    def find_or_create_blobs
-      blobs = params[:blobs]&.map do |attrs|
-        ActiveStorage::Blob.find_signed(attrs[:signed_id])
-      end
-
-      blobs || params[:files].map do |file|
-        ActiveStorage::Blob.create_and_upload!(io: file.open,
-                                               filename: file.original_filename,
-                                               content_type: file.content_type)
-      end
-    end
   end
 end

app/controllers/esign_settings_controller.rb

@@ -18,7 +18,7 @@ class EsignSettingsController < ApplicationController
     default_pkcs = GenerateCertificate.load_pkcs(cert_data) if cert_data['cert'].present?
 
     custom_pkcs_list = (cert_data['custom'] || []).map do |e|
-      { 'pkcs' => OpenSSL::PKCS12.new(Base64.urlsafe_decode64(e['data']), e['password']),
+      { 'pkcs' => OpenSSL::PKCS12.new(Base64.urlsafe_decode64(e['data']), e['password'].to_s),
         'name' => e['name'],
         'status' => e['status'] }
     end

app/controllers/submissions_controller.rb

@@ -6,7 +6,7 @@ class SubmissionsController < ApplicationController
   def show
     @submission =
       Submission.joins(:template).where(template: { account_id: current_account.id })
-                .preload(template: { documents_attachments: { preview_images_attachments: :blob } })
+                .preload(:template, template_schema_documents: [:blob, { preview_images_attachments: :blob }])
                 .find(params[:id])
 
     render :show, layout: 'plain'

app/controllers/submit_form_controller.rb

@@ -7,7 +7,9 @@ class SubmitFormController < ApplicationController
 
   def show
     @submitter =
-      Submitter.preload(submission: { template: { documents_attachments: { preview_images_attachments: :blob } } })
+      Submitter.preload(submission: [
+                          :template, { template_schema_documents: [:blob, { preview_images_attachments: :blob }] }
+                        ])
                .find_by!(slug: params[:slug])
 
     return redirect_to submit_form_completed_path(@submitter.slug) if @submitter.completed_at?

app/controllers/verify_pdf_signature_controller.rb

@@ -10,13 +10,13 @@ class VerifyPdfSignatureController < ApplicationController
     cert_data = if Docuseal.multitenant?
                   Docuseal::CERTS
                 else
-                  EncryptedConfig.find_by(account:, key: EncryptedConfig::ESIGN_CERTS_KEY)&.value || {}
+                  EncryptedConfig.find_by(account: current_account, key: EncryptedConfig::ESIGN_CERTS_KEY)&.value || {}
                 end
 
     default_pkcs = GenerateCertificate.load_pkcs(cert_data)
 
-    custom_certs = (cert_data['custom'] || []).map do |e|
-      OpenSSL::PKCS12.new(Base64.urlsafe_decode64(e['data']), e['password'])
+    custom_certs = cert_data.fetch('custom', []).map do |e|
+      OpenSSL::PKCS12.new(Base64.urlsafe_decode64(e['data']), e['password'].to_s)
     end
 
     trusted_certs = [default_pkcs.certificate,

app/models/submission.rb

@@ -38,6 +38,10 @@ class Submission < ApplicationRecord
 
   attribute :source, :string, default: 'link'
 
+  has_many :template_schema_documents,
+           ->(e) { where(uuid: (e.template_schema.presence || e.template.schema).pluck('attachment_uuid')) },
+           through: :template, source: :documents_attachments
+
   scope :active, -> { where(deleted_at: nil) }
 
   enum :source, {

app/views/submissions/_annotation.html.erb

@@ -0,0 +1 @@
+<a href="<%= annot['value'] %>" rel="noopener noreferrer nofollow" target="_blank" class="flex absolute" style="width: <%= annot['w'] * 100 %>%; height: <%= annot['h'] * 100 %>%; left: <%= annot['x'] * 100 %>%; top: <%= annot['y'] * 100 %>%"></a>

app/views/submissions/show.html.erb

@@ -24,7 +24,7 @@
   <div class="flex md:max-h-[calc(100vh-60px)]">
     <div class="overflow-y-auto overflow-x-hidden hidden lg:block w-52 flex-none pr-3 mt-0.5 pt-0.5">
       <% (@submission.template_schema || @submission.template.schema).each do |item| %>
-        <% document = @submission.template.documents.find { |a| item['attachment_uuid'] == a.uuid } %>
+        <% document = @submission.template_schema_documents.find { |a| item['attachment_uuid'] == a.uuid } %>
         <a href="#<%= "page-#{document.uuid}-0" %>" onclick="[event.preventDefault(), window[event.target.closest('a').href.split('#')[1]].scrollIntoView({ behavior: 'smooth', block: 'start' })]" class="block cursor-pointer">
           <img src="<%= document.preview_images.first.url %>" width="<%= document.preview_images.first.metadata['width'] %>" height="<%= document.preview_images.first.metadata['height'] %>" class="rounded border" loading="lazy">
           <div class="pb-2 pt-1.5 text-center">
@@ -39,11 +39,15 @@
         <% values = @submission.submitters.reduce({}) { |acc, sub| acc.merge(sub.values) } %>
         <% attachments_index = ActiveStorage::Attachment.where(record: @submission.submitters, name: :attachments).preload(:blob).index_by(&:uuid) %>
         <% (@submission.template_schema || @submission.template.schema).each do |item| %>
-          <% document = @submission.template.documents.find { |e| e.uuid == item['attachment_uuid'] } %>
+          <% document = @submission.template_schema_documents.find { |e| e.uuid == item['attachment_uuid'] } %>
+          <% document_annots_index = document.metadata.dig('pdf', 'annotations')&.group_by { |e| e['page'] } || {} %>
           <% document.preview_images.sort_by { |a| a.filename.base.to_i }.each_with_index do |page, index| %>
             <div id="<%= "page-#{document.uuid}-#{index}" %>" class="relative">
               <img src="<%= page.url %>" width="<%= page.metadata['width'] %>" class="shadow-md mb-4" height="<%= page.metadata['height'] %>" loading="lazy">
               <div class="top-0 bottom-0 left-0 right-0 absolute">
+                <% document_annots_index[index]&.each do |annot| %>
+                  <%= render 'submissions/annotation', annot: %>
+                <% end %>
                 <% fields_index.dig(document.uuid, index)&.each do |(area, field)| %>
                   <% value = values[field['uuid']] %>
                   <% next if value.blank? %>

app/views/submit_form/show.html.erb

@@ -8,11 +8,15 @@
         <%= render 'banner' %>
       </div>
       <% (@submitter.submission.template_schema || @submitter.submission.template.schema).each do |item| %>
-        <% document = @submitter.submission.template.documents.find { |a| a.uuid == item['attachment_uuid'] } %>
+        <% document = @submitter.submission.template_schema_documents.find { |a| a.uuid == item['attachment_uuid'] } %>
+        <% document_annots_index = document.metadata.dig('pdf', 'annotations')&.group_by { |e| e['page'] } || {} %>
         <% document.preview_images.sort_by { |a| a.filename.base.to_i }.each_with_index do |page, index| %>
           <div class="relative my-4 shadow-md">
             <img src="<%= page.url %>" width="<%= page.metadata['width'] %>" height="<%= page.metadata['height'] %>" loading="lazy">
             <div id="page-<%= [document.uuid, index].join('-') %>" class="top-0 bottom-0 left-0 right-0 absolute">
+              <% document_annots_index[index]&.each do |annot| %>
+                <%= render 'submissions/annotation', annot: %>
+              <% end %>
               <% fields_index.dig(document.uuid, index)&.each do |(area, field)| %>
                 <% value = values[field['uuid']] %>
                 <% next if value.blank? %>

app/views/verify_pdf_signature/_result.html.erb

@@ -54,7 +54,7 @@
             </div>
             <div class="flex items-center space-x-1">
               <%= svg_icon('certificate', class: 'w-5 h-5 inline') %>
-              <span><%= signature.signer_name %></span>
+              <span><%= signature.signer_name.force_encoding('UTF-8') %></span>
             </div>
             <div class="flex items-center space-x-1">
               <%= svg_icon('lock_access', class: 'w-5 h-5 inline') %>

lib/accounts.rb

@@ -51,7 +51,7 @@ module Accounts
       end
 
     if (default_cert = cert_data['custom']&.find { |e| e['status'] == 'default' })
-      OpenSSL::PKCS12.new(Base64.urlsafe_decode64(default_cert['data']), default_cert['password'])
+      OpenSSL::PKCS12.new(Base64.urlsafe_decode64(default_cert['data']), default_cert['password'].to_s)
     else
       GenerateCertificate.load_pkcs(cert_data)
     end

lib/templates/build_annotations.rb

@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+module Templates
+  module BuildAnnotations
+    module_function
+
+    def call(data)
+      pdf = PDF::Reader.new(StringIO.new(data))
+
+      pdf.pages.flat_map.with_index do |page, index|
+        annotations = page.objects.deref!(page.attributes[:Annots]) || []
+        annotations.filter_map do |annot|
+          next if annot[:A].blank? || annot[:A][:URI].blank?
+          next unless annot[:Subtype] == :Link
+          next if !annot[:A][:URI].starts_with?('https://') && !annot[:A][:URI].starts_with?('http://')
+
+          build_external_link_hash(page, annot).merge('page' => index)
+        end
+      end
+    end
+
+    def build_external_link_hash(page, annot)
+      left, bottom, right, top = annot[:Rect]
+
+      {
+        'type' => 'external_link',
+        'value' => annot[:A][:URI],
+        'x' => left / page.width,
+        'y' => (page.height - top) / page.height,
+        'w' => (right - left) / page.width,
+        'h' => (top - bottom) / page.height
+      }
+    end
+  end
+end

lib/templates/create_attachments.rb

@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Templates
+  module CreateAttachments
+    PDF_CONTENT_TYPE = 'application/pdf'
+
+    module_function
+
+    def call(template, params)
+      find_or_create_blobs(params).map do |blob|
+        document = template.documents.create!(blob:)
+
+        document_data = blob.download
+
+        if blob.content_type == PDF_CONTENT_TYPE && blob.metadata['pdf'].nil?
+          blob.metadata['pdf'] = { 'annotations' => Templates::BuildAnnotations.call(document_data) }
+        end
+
+        blob.save!
+
+        Templates::ProcessDocument.call(document, document_data)
+      end
+    end
+
+    def find_or_create_blobs(params)
+      blobs = params[:blobs]&.map do |attrs|
+        ActiveStorage::Blob.find_signed(attrs[:signed_id])
+      end
+
+      blobs || params[:files].map do |file|
+        data = file.read
+
+        if file.content_type == PDF_CONTENT_TYPE
+          metadata = { 'identified' => true, 'analyzed' => true,
+                       'pdf' => { 'annotations' => Templates::BuildAnnotations.call(data) } }
+        end
+
+        ActiveStorage::Blob.create_and_upload!(
+          io: StringIO.new(data),
+          filename: file.original_filename,
+          metadata:,
+          content_type: file.content_type
+        )
+      end
+    end
+  end
+end

lib/templates/process_document.rb

@@ -12,22 +12,20 @@ module Templates
 
     module_function
 
-    def call(attachment)
+    def call(attachment, data)
       if attachment.content_type == PDF_CONTENT_TYPE
-        generate_pdf_preview_images(attachment)
+        generate_pdf_preview_images(attachment, data)
       elsif attachment.image?
-        generate_preview_image(attachment)
+        generate_preview_image(attachment, data)
       end
 
       attachment
     end
 
-    def generate_preview_image(attachment)
-      binary = attachment.download
-
+    def generate_preview_image(attachment, data)
       ActiveStorage::Attachment.where(name: ATTACHMENT_NAME, record: attachment).destroy_all
 
-      image = Vips::Image.new_from_buffer(binary, '')
+      image = Vips::Image.new_from_buffer(data, '')
       image = image.autorot.resize(MAX_WIDTH / image.width.to_f)
 
       io = StringIO.new(image.write_to_buffer(FORMAT, Q: Q, interlace: true))
@@ -42,14 +40,12 @@ module Templates
       )
     end
 
-    def generate_pdf_preview_images(attachment)
-      binary = attachment.download
-
+    def generate_pdf_preview_images(attachment, data)
       ActiveStorage::Attachment.where(name: ATTACHMENT_NAME, record: attachment).destroy_all
-      number_of_pages = HexaPDF::Document.new(io: StringIO.new(binary)).pages.size - 1
+      number_of_pages = PDF::Reader.new(StringIO.new(data)).pages.size - 1
 
       (0..number_of_pages).each do |page_number|
-        page = Vips::Image.new_from_buffer(binary, '', dpi: DPI, page: page_number)
+        page = Vips::Image.new_from_buffer(data, '', dpi: DPI, page: page_number)
         page = page.resize(MAX_WIDTH / page.width.to_f)
 
         io = StringIO.new(page.write_to_buffer(FORMAT, Q: Q, interlace: true))

spec/factories/templates.rb

@@ -19,7 +19,7 @@ FactoryBot.define do
         record: template
       )
 
-      Templates::ProcessDocument.call(attachment)
+      Templates::ProcessDocument.call(attachment, attachment.download)
 
       template.schema = [{ attachment_uuid: attachment.uuid, name: 'sample-document' }]
       template.submitters = [