Add configuration for all_text indexing

app/indexers/concerns/iiif_print/file_set_indexer.rb

@@ -19,10 +19,8 @@ def generate_solr_document
         # only UV viewable images should have is_page_of, it is only used for iiif search
         solr_doc['is_page_of_ssim'] = iiif_print_lineage_service.ancestor_ids_for(object) if object.mime_type&.match(/image/)
         # index for full text search
-        text = IiifPrint::Data::WorkDerivatives.data(from: object, of_type: 'txt')
-        text = text.tr("\n", ' ').squeeze(' ')
-        solr_doc['all_text_timv'] = text
-        solr_doc['all_text_tsimv'] = text
+        solr_doc['all_text_timv'] = all_text
+        solr_doc['all_text_tsimv'] = all_text
         solr_doc['digest_ssim'] = digest_from_content
       end
     end
@@ -33,5 +31,12 @@ def digest_from_content
       return unless object.original_file
       object.original_file.digest.first.to_s
     end
+
+    def all_text
+      text = IiifPrint.config.all_text_generator_function.call(object: object) || ''
+      return text if text.empty?
+
+      text.tr("\n", ' ').squeeze(' ')
+    end
   end
 end

lib/iiif_print/configuration.rb

@@ -183,6 +183,18 @@ def ocr_coords_from_json_function
         IiifPrint::Data::WorkDerivatives.data(from: file_set_id, of_type: 'json')
       end
     end
+
+    attr_writer :all_text_generator_function
+    ##
+    # This configuration determines where to pull the full text from.  By default, it will
+    # pull from the TXT file that is generated by the OCR engine.  However, if your
+    # application has its own implementation of generating the full text, then you can
+    # set your own configuration here.
+    def all_text_generator_function
+      @all_text_generator_function ||= lambda do |object:|
+        IiifPrint::Data::WorkDerivatives.data(from: object, of_type: 'txt')
+      end
+    end
   end
   # rubocop:enable Metrics/ModuleLength
 end

spec/iiif_print/configuration_spec.rb

@@ -143,4 +143,12 @@
       expect(function.parameters).to eq([[:keyreq, :file_set_id], [:keyrest]])
     end
   end
+
+  describe "#all_text_generator_function" do
+    subject(:function) { config.all_text_generator_function }
+
+    it "is expected to be a lambda with one keyword arg" do
+      expect(function.parameters).to eq([[:keyreq, :object]])
+    end
+  end
 end