implement base url thing whoo

app/controllers/maps_controller.rb

@@ -91,7 +91,8 @@ class MapsController < ApplicationController
 
   # GET maps/:id/export
   def export
-    exporter = MapExportService.new(current_user, @map)
+
+    exporter = MapExportService.new(current_user, @map, base_url: request.base_url)
     respond_to do |format|
       format.json { render json: exporter.json }
       format.csv { send_data exporter.csv }

app/models/user.rb

@@ -67,11 +67,12 @@ class User < ApplicationRecord
     json
   end
 
-  def as_rdf
+  def as_rdf(opts = {})
+    base_url = opts[:base_url] || 'https://metamaps.cc'
     output = ''
     output += %(d:mapper_#{id} a foaf:OnlineAccount ;\n)
     output += %(  foaf:accountName "#{name}";\n)
-    output += %(  foaf:accountServiceHomepage "https://metamaps.cc/mapper/#{id}";\n)
+    output += %(  foaf:accountServiceHomepage "#{base_url}/mapper/#{id}";\n)
     output[-2] = '.' # change last ; to a .
     output += %(\n)
     output

app/services/map_export_service.rb

@@ -32,7 +32,7 @@ class MapExportService
     output += "PREFIX foaf: <http://xmlns.com/foaf/0.1/>\n"
     output += "\n"
     map.contributors.each do |mapper|
-      output += mapper.as_rdf
+      output += mapper.as_rdf(base_url: base_url)
     end
     map.topics.each do |topic|
       output += topic.as_rdf