When downloading image, allow other map styles

app/controllers/export_controller.rb

@@ -13,19 +13,27 @@ class ExportController < ApplicationController
   # When the user clicks 'Export' we redirect to a URL which generates the export download
   def finish
     bbox = BoundingBox.from_lon_lat_params(params)
-    format = params[:format]
+    style = params[:format]
+    format = params[:mapnik_format]
 
-    case format
+    case style
     when "osm"
       # redirect to API map get
       redirect_to :controller => "api/map", :action => "index", :bbox => bbox
 
     when "mapnik"
       # redirect to a special 'export' cgi script
-      format = params[:mapnik_format]
       scale = params[:mapnik_scale]
 
       redirect_to "https://render.openstreetmap.org/cgi-bin/export?bbox=#{bbox}&scale=#{scale}&format=#{format}", :allow_other_host => true
+    when "cyclemap", "transportmap"
+      zoom = params[:zoom]
+      lat = params[:lat]
+      lon = params[:lon]
+      width = params[:width]
+      height = params[:height]
+
+      redirect_to "https://tile.thunderforest.com/static/#{style[..-4]}/#{lon},#{lat},#{zoom}/#{width}x#{height}.#{format}?apikey=#{Settings.thunderforest_key}", :allow_other_host => true
     end
   end