Upgrade slf4j and iText to v8.0.5. (#49)

* Upgrade slf4j and iText to v8.0..5

* Remove a useless comment.

lib/fillable-pdf.rb

@@ -22,7 +22,7 @@ def initialize(file_path)
       @pdf_writer = ITEXT::PdfWriter.new @byte_stream
       @pdf_doc = ITEXT::PdfDocument.new @pdf_reader, @pdf_writer
       @pdf_form = ITEXT::PdfAcroForm.getAcroForm(@pdf_doc, true)
-      @form_fields = @pdf_form.getFormFields
+      @form_fields = @pdf_form.getAllFormFields
     rescue StandardError => e
       handle_pdf_open_error(e)
     end
@@ -123,7 +123,10 @@ def set_image(key, file_path) # rubocop:disable Metrics/AbcSize, Metrics/MethodL
       widgets = field.getWidgets
       widget_dict = suppress_warnings { widgets.isEmpty ? field.getPdfObject : widgets.get(0).getPdfObject }
       orig_rect = widget_dict.getAsRectangle(ITEXT::PdfName.Rect)
-      border_width = field.getBorderWidth
+
+      border_style = field.getWidgets.get(0).getBorderStyle
+      border_width = border_style.nil? ? 0 : border_style.getWidth
+
       bounding_rectangle = ITEXT::Rectangle.new(
         orig_rect.getWidth - (border_width * 2),
         orig_rect.getHeight - (border_width * 2)
@@ -213,6 +216,7 @@ def rename_field(old_key, new_key)
   def remove_field(key)
     if @form_fields.containsKey(key.to_s)
       @pdf_form.removeField(key.to_s)
+      @form_fields.remove(key.to_s)
     else
       raise "Unknown key name `#{key}'"
     end
@@ -306,10 +310,6 @@ def validate_input(key, value)
   end
 
   def handle_pdf_open_error(err)
-    if err.message.include?('crypto/BlockCipher')
-      raise 'The PDF file is encrypted and cannot be opened.'
-    else
-      raise "#{err.message} (Input file may be corrupt, incompatible, read-only, write-protected, encrypted, or may not have any form fields)" # rubocop:disable Layout/LineLength
-    end
+    raise "#{err.message} (Input file may be corrupt, incompatible, read-only, write-protected, encrypted, or may not have any form fields)" # rubocop:disable Layout/LineLength
   end
 end

test/pdf_test.rb

@@ -65,7 +65,7 @@ def test_that_file_has_a_positive_number_of_editable_fields
   end
 
   def test_that_hash_can_be_accessed
-    assert_equal 16, @pdf.fields.length
+    assert_equal 12, @pdf.fields.length
   end
 
   def test_that_a_field_value_can_be_accessed_by_name
@@ -117,10 +117,10 @@ def test_that_a_checkbox_can_be_checked_and_unchecked
   def test_that_a_radio_button_can_be_checked_and_unchecked
     @pdf.set_field(:language, 'ruby')
 
-    3.times { |i| assert_equal 'ruby', @pdf.field("language.#{i}".gsub('.0', '')) }
+    assert_equal 'ruby', @pdf.field(:language)
     @pdf.set_field(:language, 'Off')
 
-    3.times { |i| assert_equal 'Off', @pdf.field("language.#{i}".gsub('.0', '')) }
+    assert_equal 'Off', @pdf.field(:language)
   end
 
   def test_that_a_field_can_be_renamed
@@ -136,7 +136,7 @@ def test_that_a_field_can_be_renamed
   end
 
   def test_that_a_field_can_be_removed
-    @pdf.remove_field(:first_name)
+    assert @pdf.remove_field(:first_name)
     err = assert_raises RuntimeError do
       @pdf.field(:first_name)
     end
@@ -220,11 +220,10 @@ def test_save_with_flattening
 
   def test_open_encrypted_pdf
     encrypted_pdf_path = 'test/files/encrypted.pdf'
-    # Assuming you have an encrypted PDF for testing
     err = assert_raises StandardError do
       FillablePDF.new(encrypted_pdf_path)
     end
-    assert_equal 'The PDF file is encrypted and cannot be opened.', err.message
+    assert_match 'file may be corrupt, incompatible, read-only, write-protected, encrypted', err.message
   end
 
   def test_open_signed_and_certified_pdf