display records integrity status

app/assets/stylesheets/modules/invoice.scss

@@ -1,6 +1,14 @@
 
 // admin invoices
 
+.chained {
+  color: green;
+}
+
+.broken {
+  color: red;
+}
+
 .invoice-placeholder {
   width: 80%;
   max-width: 800px;

app/assets/templates/admin/invoices/index.html.erb

@@ -61,6 +61,7 @@
     		      <table class="table" ng-if="invoices.length > 0">
     		        <thead>
     		        <tr>
+                  <th style="width:5%"></th>
     		          <th style="width:15%"><a href="" ng-click="setOrderInvoice('reference')">{{ 'invoices.invoice_#' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-numeric-asc': orderInvoice=='reference', 'fa fa-sort-numeric-desc': orderInvoice=='-reference', 'fa fa-arrows-v': orderInvoice }"></i></a></th>
 
     		          <th style="width:20%"><a href="" ng-click="setOrderInvoice('date')">{{ 'invoices.date' | translate }} <i class="fa fa-arrows-v" ng-class="{'fa fa-sort-numeric-asc': orderInvoice=='date', 'fa fa-sort-numeric-desc': orderInvoice=='-date', 'fa fa-arrows-v': orderInvoice }"></i></a></th>
@@ -74,6 +75,10 @@
     		        </thead>
     		        <tbody>
     		        <tr ng-repeat="invoice in invoices">
+                  <td>
+                    <i class="fa fa-link chained" ng-show="invoice.chained_footprint"/>
+                    <i class="fa fa-chain-broken broken" ng-hide="invoice.chained_footprint"/>
+                  </td>
     		          <td>{{ invoice.reference }}</td>
     		          <td ng-if="!invoice.is_avoir">{{ invoice.date | amDateFormat:'L LTS' }}</td>
     		          <td ng-if="invoice.is_avoir">{{ invoice.date | amDateFormat:'L' }}</td>

app/models/invoice.rb

@@ -212,16 +212,11 @@ class Invoice < ActiveRecord::Base
   end
 
   def chain_record
-    max_date = created_at || DateTime.now
-    previous = Invoice.where('created_at < ?', max_date)
-                      .order('created_at DESC')
-                      .limit(1)
+    self.footprint = compute_footprint
+  end
 
-    columns  = Invoice.columns.map(&:name)
-                      .delete_if { |c| c == 'footprint' }
-
-    sha256 = Digest::SHA256.new
-    self.footprint = sha256.hexdigest "#{columns.map { |c| self[c] }.join}#{previous.first ? previous.first.footprint : ''}"
+  def check_footprint
+    invoice_items.map(&:check_footprint).all? && footprint == compute_footprint
   end
 
   private
@@ -269,4 +264,17 @@ class Invoice < ActiveRecord::Base
     Invoice.where('created_at >= :start_date AND created_at < :end_date', start_date: start, end_date: ending).length
   end
 
+  def compute_footprint
+    max_date = created_at || DateTime.now
+    previous = Invoice.where('created_at < ?', max_date)
+                      .order('created_at DESC')
+                      .limit(1)
+
+    columns  = Invoice.columns.map(&:name)
+                      .delete_if { |c| %w[footprint updated_at].include? c }
+
+    sha256 = Digest::SHA256.new
+    sha256.hexdigest "#{columns.map { |c| self[c] }.join}#{previous.first ? previous.first.footprint : ''}"
+  end
+
 end

app/models/invoice_item.rb

@@ -7,13 +7,23 @@ class InvoiceItem < ActiveRecord::Base
   after_create :chain_record
 
   def chain_record
+    self.footprint = compute_footprint
+  end
+
+  def check_footprint
+    footprint == compute_footprint
+  end
+
+  private
+
+  def compute_footprint
     max_date = created_at || Time.current
     previous = InvoiceItem.where('created_at < ?', max_date)
                           .order('created_at DESC')
                           .limit(1)
 
     columns = InvoiceItem.columns.map(&:name)
-                         .delete_if { |c| c == 'footprint' }
+                         .delete_if { |c| %w[footprint updated_at].include? c }
 
     sha256 = Digest::SHA256.new
     self.footprint = sha256.hexdigest "#{columns.map { |c| self[c] }.join}#{previous.first ? previous.first.footprint : ''}"

app/views/api/invoices/list.json.jbuilder

@@ -12,4 +12,5 @@ json.array!(@invoices) do |invoice|
   json.stripe invoice.stp_invoice_id?
   json.date invoice.is_a?(Avoir) ? invoice.avoir_date : invoice.created_at
   json.prevent_refund invoice.prevent_refund?
+  json.chained_footprint invoice.check_footprint
 end