Add history changesets layer module

[rails.git] / app / controllers / changesets_controller.rb

diff --git a/app/controllers/changesets_controller.rb b/app/controllers/changesets_controller.rb
index 928f1c1ecf25724fa33fc9933eed9d49ded35bc4..07e7a365f0d1a3884e62a99f3cdb61fc82e64bad 100644 (file)
--- a/app/controllers/changesets_controller.rb
+++ b/app/controllers/changesets_controller.rb
@@ -2,14 +2,14 @@
 
 class ChangesetsController < ApplicationController
   include UserMethods
+  include PaginationMethods
 
   layout "site"
 
   before_action :authorize_web
   before_action :set_locale
-  before_action -> { check_database_readable(:need_api => true) }, :only => [:index, :feed, :show]
+  before_action -> { check_database_readable(:need_api => true) }
   before_action :require_oauth, :only => :show
-  before_action :check_database_writable, :only => [:subscribe, :unsubscribe]
 
   authorize_resource
 
@@ -18,12 +18,13 @@ class ChangesetsController < ApplicationController
   ##
   # list non-empty changesets in reverse chronological order
   def index
-    param! :max_id, Integer, :min => 1
+    param! :before, Integer, :min => 1
+    param! :after, Integer, :min => 1
 
-    @params = params.permit(:display_name, :bbox, :friends, :nearby, :max_id, :list)
+    @params = params.permit(:display_name, :bbox, :friends, :nearby, :before, :after, :list)
 
-    if request.format == :atom && @params[:max_id]
-      redirect_to url_for(@params.merge(:max_id => nil)), :status => :moved_permanently
+    if request.format == :atom && (@params[:before] || @params[:after])
+      redirect_to url_for(@params.merge(:before => nil, :after => nil)), :status => :moved_permanently
       return
     end
 
@@ -53,16 +54,17 @@ class ChangesetsController < ApplicationController
                        changesets.where("false")
                      end
       elsif @params[:bbox]
-        changesets = conditions_bbox(changesets, BoundingBox.from_bbox_params(params))
+        bbox_array = @params[:bbox].split(",").map(&:to_f)
+        raise OSM::APIBadUserInput, "The parameter bbox must be of the form min_lon,min_lat,max_lon,max_lat" unless bbox_array.count == 4
+
+        changesets = conditions_bbox(changesets, *bbox_array)
       elsif @params[:friends] && current_user
-        changesets = changesets.where(:user => current_user.friends.identifiable)
+        changesets = changesets.where(:user => current_user.followings.identifiable)
       elsif @params[:nearby] && current_user
         changesets = changesets.where(:user => current_user.nearby)
       end
 
-      changesets = changesets.where(:changesets => { :id => ..@params[:max_id] }) if @params[:max_id]
-
-      @changesets = changesets.order("changesets.id DESC").limit(20).preload(:user, :changeset_tags, :comments)
+      @changesets, @newer_changesets_id, @older_changesets_id = get_page_items(changesets, :includes => [:user, :changeset_tags, :comments])
 
       render :action => :index, :layout => false
     end
@@ -107,34 +109,6 @@ class ChangesetsController < ApplicationController
     render :template => "browse/not_found", :status => :not_found, :layout => map_layout
   end
 
-  ##
-  # subscribe to a changeset
-  def subscribe
-    @changeset = Changeset.find(params[:id])
-
-    if request.post?
-      @changeset.subscribe(current_user) unless @changeset.subscribed?(current_user)
-
-      redirect_to changeset_path(@changeset)
-    end
-  rescue ActiveRecord::RecordNotFound
-    render :action => "no_such_entry", :status => :not_found
-  end
-
-  ##
-  # unsubscribe from a changeset
-  def unsubscribe
-    @changeset = Changeset.find(params[:id])
-
-    if request.post?
-      @changeset.unsubscribe(current_user)
-
-      redirect_to changeset_path(@changeset)
-    end
-  rescue ActiveRecord::RecordNotFound
-    render :action => "no_such_entry", :status => :not_found
-  end
-
   private
 
   #------------------------------------------------------------
@@ -142,21 +116,37 @@ class ChangesetsController < ApplicationController
   #------------------------------------------------------------
 
   ##
-  # if a bounding box was specified do some sanity checks.
   # restrict changesets to those enclosed by a bounding box
-  def conditions_bbox(changesets, bbox)
-    if bbox
-      bbox.check_boundaries
-      bbox = bbox.to_scaled
-
-      changesets.where("min_lon < ? and max_lon > ? and min_lat < ? and max_lat > ?",
-                       bbox.max_lon.to_i, bbox.min_lon.to_i,
-                       bbox.max_lat.to_i, bbox.min_lat.to_i)
-    else
+  def conditions_bbox(changesets, min_lon, min_lat, max_lon, max_lat)
+    db_min_lat = (min_lat * GeoRecord::SCALE).to_i
+    db_max_lat = (max_lat * GeoRecord::SCALE).to_i
+    db_min_lon = (wrap_lon(min_lon) * GeoRecord::SCALE).to_i
+    db_max_lon = (wrap_lon(max_lon) * GeoRecord::SCALE).to_i
+
+    changesets = changesets.where("min_lat < ? and max_lat > ?", db_max_lat, db_min_lat)
+
+    if max_lon - min_lon >= 360
+      # the query bbox spans the entire world, therefore no lon checks are necessary
       changesets
+    elsif db_min_lon <= db_max_lon
+      # the normal case when the query bbox doesn't include the antimeridian
+      changesets.where("min_lon < ? and max_lon > ?", db_max_lon, db_min_lon)
+    else
+      # the query bbox includes the antimeridian
+      # this case works as if there are two query bboxes:
+      #   [-180*SCALE .. db_max_lon], [db_min_lon .. 180*SCALE]
+      # it would be necessary to check if changeset bboxes intersect with either of the query bboxes:
+      #   (changesets.min_lon < db_max_lon and changesets.max_lon > -180*SCALE) or (changesets.min_lon < 180*SCALE and changesets.max_lon > db_min_lon)
+      # but the comparisons with -180*SCALE and 180*SCALE are unnecessary:
+      #   (changesets.min_lon < db_max_lon) or (changesets.max_lon > db_min_lon)
+      changesets.where("min_lon < ? or max_lon > ?", db_max_lon, db_min_lon)
     end
   end
 
+  def wrap_lon(lon)
+    ((lon + 180) % 360) - 180
+  end
+
   ##
   # eliminate empty changesets (where the bbox has not been set)
   # this should be applied to all changeset list displays