Add BankAccountConnector to implement bank import methods in plugins

app/controllers/finance/bank_accounts_controller.rb

@@ -15,16 +15,36 @@ class Finance::BankAccountsController < Finance::BaseController
 
   def import
     @bank_account = BankAccount.find(params[:id])
-    import_method = @bank_account.find_import_method
-    if import_method
-      count = import_method.call(@bank_account)
-      redirect_to finance_bank_account_transactions_url(@bank_account), notice: t('.notice', count: count)
+    importer = @bank_account.find_connector
+
+    if importer
+      importer.load params[:state] && YAML.load(params[:state])
+
+      ok = importer.import params[:controls]
+
+      importer.finish if ok
+      flash.notice = t('.notice', count: importer.count) if ok
+      @auto_submit = importer.auto_submit
+      @controls = importer.controls
+      #TODO: encrypt state
+      @state = YAML.dump importer.dump
     else
-      # @todo add import for csv files as fallback
-      redirect_to finance_bank_account_transactions_url(@bank_account), alert: t('.no_import_method')
+      ok = true
+      flash.alert = t('.no_import_method')
     end
+
+    needs_redirect = ok
   rescue => error
-    redirect_to finance_bank_account_transactions_url(@bank_account), alert: t('errors.general_msg', msg: error.message)
+    flash.alert = t('errors.general_msg', msg: error.message)
+    needs_redirect = true
+  ensure
+    return unless needs_redirect
+    redirect_path = finance_bank_account_transactions_url(@bank_account)
+    if request.post?
+      @js_redirect = redirect_path
+    else
+      redirect_to redirect_path
+    end
   end
 
 end

app/models/bank_account.rb

@@ -10,7 +10,9 @@ class BankAccount < ApplicationRecord
   validates_numericality_of :balance, :message => I18n.t('bank_account.model.invalid_balance')
 
   # @return [Function] Method wich can be called to import transaction from a bank or nil if unsupported
-  def find_import_method
+  def find_connector
+    klass = BankAccountConnector.find iban
+    return klass.new self if klass
   end
 
   def assign_unlinked_transactions

app/views/finance/bank_accounts/_import.html.haml

@@ -0,0 +1,33 @@
+= form_tag import_finance_bank_account_path(@bank_account), class: 'form-horizontal',
+    data: { auto_submit: @auto_submit}, id: 'import_form', method: :post, remote: true  do
+
+  = hidden_field_tag :import_uid, @import_uid
+  = hidden_field_tag :state, @state
+
+  - for control in @controls
+    - name = control.name
+    .control-group
+      - if name
+        - if control.type == :hidden
+          = hidden_field_tag "controls[#{control.name}]", control.value
+        - else
+          %label(for=name class='control-label')
+            = control.label + ':'
+          .controls
+            - if control.type == :password
+              = password_field_tag "controls[#{control.name}]", control.value
+            -else
+              = text_field_tag "controls[#{control.name}]", control.value
+      - else
+        = control.text
+
+  - if @auto_submit
+    :javascript
+      var form = $('#import_form');
+      setTimeout(function() {
+        form.submit();
+      }, form.data('auto-submit'));
+  - else
+    .control-group
+      .controls
+        = submit_tag t('.submit'), class: 'btn btn-primary'

app/views/finance/bank_accounts/import.html.haml

@@ -1,12 +1,4 @@
 - title t('.title', name: @bank_account.name)
 
-= form_for :bank_accounts, :url => parse_upload_finance_bank_account_path(@bank_account),
-   :html => { multipart: true, class: "form-horizontal" } do |f|
-
-  .control-group
-    %label(for="bank_transactions_file")= t '.file_label'
-    = f.file_field "file"
-
-  .form-actions
-    = submit_tag t('.submit'), class: 'btn btn-primary'
-    = link_to t('ui.or_cancel'), finance_bank_account_transactions_path(@bank_account)
+#import
+  = render "import"

app/views/finance/bank_accounts/import.js.haml

@@ -0,0 +1,4 @@
+- if @js_redirect
+  document.location.replace('#{escape_javascript(@js_redirect)}');
+- else
+  $('#import').html('#{escape_javascript(render("import"))}');