X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/b92a2de9ec251b219dc1908a52da4239b05af6c7..5cfc163bc2d47c2a1c179127111e287eebbbda75:/app/controllers/changeset_controller.rb?ds=inline

diff --git a/app/controllers/changeset_controller.rb b/app/controllers/changeset_controller.rb
index c7cb245f3..0a63d5253 100644
--- a/app/controllers/changeset_controller.rb
+++ b/app/controllers/changeset_controller.rb
@@ -1,21 +1,22 @@
 # The ChangesetController is the RESTful interface to Changeset objects
 
 class ChangesetController < ApplicationController
-  layout 'site'
-  require 'xml/libxml'
-
-  skip_before_filter :verify_authenticity_token, :except => [:list]
-  before_filter :authorize_web, :only => [:list, :feed]
-  before_filter :set_locale, :only => [:list, :feed]
-  before_filter :authorize, :only => [:create, :update, :delete, :upload, :include, :close]
-  before_filter :require_allow_write_api, :only => [:create, :update, :delete, :upload, :include, :close]
-  before_filter :require_public_data, :only => [:create, :update, :delete, :upload, :include, :close]
-  before_filter :check_api_writable, :only => [:create, :update, :delete, :upload, :include]
-  before_filter :check_api_readable, :except => [:create, :update, :delete, :upload, :download, :query, :list, :feed]
-  before_filter(:only => [:list, :feed]) { |c| c.check_database_readable(true) }
-  after_filter :compress_output
-  around_filter :api_call_handle_error, :except => [:list, :feed]
-  around_filter :web_timeout, :only => [:list, :feed]
+  layout "site"
+  require "xml/libxml"
+
+  skip_before_action :verify_authenticity_token, :except => [:list]
+  before_action :authorize_web, :only => [:list, :feed, :comments_feed]
+  before_action :set_locale, :only => [:list, :feed, :comments_feed]
+  before_action :authorize, :only => [:create, :update, :upload, :close, :comment, :subscribe, :unsubscribe, :hide_comment, :unhide_comment]
+  before_action :require_moderator, :only => [:hide_comment, :unhide_comment]
+  before_action :require_allow_write_api, :only => [:create, :update, :upload, :close, :comment, :subscribe, :unsubscribe, :hide_comment, :unhide_comment]
+  before_action :require_public_data, :only => [:create, :update, :upload, :close, :comment, :subscribe, :unsubscribe]
+  before_action :check_api_writable, :only => [:create, :update, :upload, :comment, :subscribe, :unsubscribe, :hide_comment, :unhide_comment]
+  before_action :check_api_readable, :except => [:create, :update, :upload, :download, :query, :list, :feed, :comment, :subscribe, :unsubscribe, :comments_feed]
+  before_action(:only => [:list, :feed, :comments_feed]) { |c| c.check_database_readable(true) }
+  around_action :api_call_handle_error, :except => [:list, :feed, :comments_feed]
+  around_action :api_call_timeout, :except => [:list, :feed, :comments_feed, :upload]
+  around_action :web_timeout, :only => [:list, :feed, :comments_feed]
 
   # Helper methods for checking consistency
   include ConsistencyValidations
@@ -27,9 +28,13 @@ class ChangesetController < ApplicationController
     cs = Changeset.from_xml(request.raw_post, true)
 
     # Assume that Changeset.from_xml has thrown an exception if there is an error parsing the xml
-    cs.user_id = @user.id
+    cs.user = current_user
     cs.save_with_tags!
-    render :text => cs.id.to_s, :content_type => "text/plain"
+
+    # Subscribe user to changeset comments
+    cs.subscribers << current_user
+
+    render :plain => cs.id.to_s
   end
 
   ##
@@ -37,7 +42,8 @@ class ChangesetController < ApplicationController
   # return anything about the nodes, ways and relations in the changeset.
   def read
     changeset = Changeset.find(params[:id])
-    render :text => changeset.to_xml.to_s, :content_type => "text/xml"
+
+    render :xml => changeset.to_xml(params[:include_discussion].presence).to_s
   end
 
   ##
@@ -47,7 +53,7 @@ class ChangesetController < ApplicationController
     assert_method :put
 
     changeset = Changeset.find(params[:id])
-    check_changeset_consistency(changeset, @user)
+    check_changeset_consistency(changeset, current_user)
 
     # to close the changeset, we'll just set its closed_at time to
     # now. this might not be enough if there are concurrency issues,
@@ -55,7 +61,7 @@ class ChangesetController < ApplicationController
     changeset.set_closed_time_now
 
     changeset.save!
-    render :nothing => true
+    head :ok
   end
 
   ##
@@ -69,18 +75,18 @@ class ChangesetController < ApplicationController
     assert_method :post
 
     cs = Changeset.find(params[:id])
-    check_changeset_consistency(cs, @user)
+    check_changeset_consistency(cs, current_user)
 
     # keep an array of lons and lats
-    lon = Array.new
-    lat = Array.new
+    lon = []
+    lat = []
 
     # the request is in pseudo-osm format... this is kind-of an
     # abuse, maybe should change to some other format?
-    doc = XML::Parser.string(request.raw_post).parse
+    doc = XML::Parser.string(request.raw_post, :options => XML::Parser::Options::NOERROR).parse
     doc.find("//osm/node").each do |n|
-      lon << n['lon'].to_f * GeoRecord::SCALE
-      lat << n['lat'].to_f * GeoRecord::SCALE
+      lon << n["lon"].to_f * GeoRecord::SCALE
+      lat << n["lat"].to_f * GeoRecord::SCALE
     end
 
     # add the existing bounding box to the lon-lat array
@@ -90,13 +96,15 @@ class ChangesetController < ApplicationController
     lat << cs.max_lat unless cs.max_lat.nil?
 
     # collapse the arrays to minimum and maximum
-    cs.min_lon, cs.min_lat, cs.max_lon, cs.max_lat =
-      lon.min, lat.min, lon.max, lat.max
+    cs.min_lon = lon.min
+    cs.min_lat = lat.min
+    cs.max_lon = lon.max
+    cs.max_lat = lat.max
 
     # save the larger bounding box and return the changeset, which
     # will include the bigger bounding box.
     cs.save!
-    render :text => cs.to_xml.to_s, :content_type => "text/xml"
+    render :xml => cs.to_xml.to_s
   end
 
   ##
@@ -119,12 +127,12 @@ class ChangesetController < ApplicationController
     assert_method :post
 
     changeset = Changeset.find(params[:id])
-    check_changeset_consistency(changeset, @user)
+    check_changeset_consistency(changeset, current_user)
 
     diff_reader = DiffReader.new(request.raw_post, changeset)
     Changeset.transaction do
       result = diff_reader.commit
-      render :text => result.to_s, :content_type => "text/xml"
+      render :xml => result.to_s
     end
   end
 
@@ -154,7 +162,7 @@ class ChangesetController < ApplicationController
     # global (SVN-style) versioning were used - then that would be
     # unambiguous.
     elements.sort! do |a, b|
-      if (a.timestamp == b.timestamp)
+      if a.timestamp == b.timestamp
         a.version <=> b.version
       else
         a.timestamp <=> b.timestamp
@@ -174,42 +182,45 @@ class ChangesetController < ApplicationController
     # check these assertions.
     elements.each do |elt|
       result.root <<
-        if (elt.version == 1)
+        if elt.version == 1
           # first version, so it must be newly-created.
           created = XML::Node.new "create"
           created << elt.to_xml_node(changeset_cache, user_display_name_cache)
+        elsif elt.visible
+          # must be a modify
+          modified = XML::Node.new "modify"
+          modified << elt.to_xml_node(changeset_cache, user_display_name_cache)
         else
-          unless elt.visible
-            # if the element isn't visible then it must have been deleted
-            deleted = XML::Node.new "delete"
-            deleted << elt.to_xml_node(changeset_cache, user_display_name_cache)
-          else
-            # must be a modify
-            modified = XML::Node.new "modify"
-            modified << elt.to_xml_node(changeset_cache, user_display_name_cache)
-          end
+          # if the element isn't visible then it must have been deleted
+          deleted = XML::Node.new "delete"
+          deleted << elt.to_xml_node(changeset_cache, user_display_name_cache)
         end
     end
 
-    render :text => result.to_s, :content_type => "text/xml"
+    render :xml => result.to_s
   end
 
   ##
   # query changesets by bounding box, time, user or open/closed status.
   def query
     # find any bounding box
-    if params['bbox']
-      bbox = BoundingBox.from_bbox_params(params)
-    end
+    bbox = BoundingBox.from_bbox_params(params) if params["bbox"]
 
     # create the conditions that the user asked for. some or all of
     # these may be nil.
-    changesets = Changeset.scoped
+    changesets = Changeset.all
     changesets = conditions_bbox(changesets, bbox)
-    changesets = conditions_user(changesets, params['user'], params['display_name'])
-    changesets = conditions_time(changesets, params['time'])
-    changesets = conditions_open(changesets, params['open'])
-    changesets = conditions_closed(changesets, params['closed'])
+    changesets = conditions_user(changesets, params["user"], params["display_name"])
+    changesets = conditions_time(changesets, params["time"])
+    changesets = conditions_open(changesets, params["open"])
+    changesets = conditions_closed(changesets, params["closed"])
+    changesets = conditions_ids(changesets, params["changesets"])
+
+    # sort and limit the changesets
+    changesets = changesets.order("created_at DESC").limit(100)
+
+    # preload users, tags and comments
+    changesets = changesets.preload(:user, :changeset_tags, :comments)
 
     # create the results document
     results = OSM::API.new.get_xml_doc
@@ -219,7 +230,7 @@ class ChangesetController < ApplicationController
       results.root << cs.to_xml_node
     end
 
-    render :text => results.to_s, :content_type => "text/xml"
+    render :xml => results.to_s
   end
 
   ##
@@ -237,104 +248,59 @@ class ChangesetController < ApplicationController
     changeset = Changeset.find(params[:id])
     new_changeset = Changeset.from_xml(request.raw_post)
 
-    unless new_changeset.nil?
-      check_changeset_consistency(changeset, @user)
-      changeset.update_from(new_changeset, @user)
-      render :text => changeset.to_xml, :mime_type => "text/xml"
-    else
-
-      render :nothing => true, :status => :bad_request
-    end
+    check_changeset_consistency(changeset, current_user)
+    changeset.update_from(new_changeset, current_user)
+    render :xml => changeset.to_xml.to_s
   end
 
   ##
-  # list edits (open changesets) in reverse chronological order
+  # list non-empty changesets in reverse chronological order
   def list
-    if request.format == :atom and params[:page]
-      redirect_to params.merge({ :page => nil }), :status => :moved_permanently
-    else
-      changesets = conditions_nonempty(Changeset.scoped)
-
-      if params[:display_name]
-        user = User.find_by_display_name(params[:display_name])
-
-        if user and user.active?
-          if user.data_public? or user == @user
-            changesets = changesets.where(:user_id => user.id)
-          else
-            changesets = changesets.where("false")
-          end
-        else
-          render_unknown_user params[:display_name]
-          return
-        end
-      end
-
-      if params[:friends]
-        if @user
-          changesets = changesets.where(:user_id => @user.friend_users.public)
-        elsif request.format == :html
-          require_user
-          return
-        end
-      end
-
-      if params[:nearby]
-        if @user
-          changesets = changesets.where(:user_id => @user.nearby)
-        elsif request.format == :html
-          require_user
-          return
-        end
-      end
+    @params = params.permit(:display_name, :bbox, :friends, :nearby, :max_id, :list)
 
-      if params[:bbox]
-        bbox = BoundingBox.from_bbox_params(params)
-      elsif params[:minlon] and params[:minlat] and params[:maxlon] and params[:maxlat]
-        bbox = BoundingBox.from_lon_lat_params(params)
-      end
+    if request.format == :atom && @params[:max_id]
+      redirect_to url_for(@params.merge(:max_id => nil)), :status => :moved_permanently
+      return
+    end
 
-      if bbox
-        changesets = conditions_bbox(changesets, bbox)
-        bbox_link = render_to_string :partial => "bbox", :object => bbox
+    if @params[:display_name]
+      user = User.find_by(:display_name => @params[:display_name])
+      if !user || !user.active?
+        render_unknown_user @params[:display_name]
+        return
       end
+    end
 
-      if user
-        user_link = render_to_string :partial => "user", :object => user
-      end
+    if (@params[:friends] || @params[:nearby]) && !current_user
+      require_user
+      return
+    end
 
-      if params[:friends] and @user
-        @title =  t 'changeset.list.title_friend'
-        @heading =  t 'changeset.list.heading_friend'
-        @description = t 'changeset.list.description_friend'
-      elsif params[:nearby] and @user
-        @title = t 'changeset.list.title_nearby'
-        @heading = t 'changeset.list.heading_nearby'
-        @description = t 'changeset.list.description_nearby'
-      elsif user and bbox
-        @title =  t 'changeset.list.title_user_bbox', :user => user.display_name, :bbox => bbox.to_s
-        @heading =  t 'changeset.list.heading_user_bbox', :user => user.display_name, :bbox => bbox.to_s
-        @description = t 'changeset.list.description_user_bbox', :user => user_link, :bbox => bbox_link
-      elsif user
-        @title =  t 'changeset.list.title_user', :user => user.display_name
-        @heading =  t 'changeset.list.heading_user', :user => user.display_name
-        @description = t 'changeset.list.description_user', :user => user_link
-      elsif bbox
-        @title =  t 'changeset.list.title_bbox', :bbox => bbox.to_s
-        @heading =  t 'changeset.list.heading_bbox', :bbox => bbox.to_s
-        @description = t 'changeset.list.description_bbox', :bbox => bbox_link
-      else
-        @title =  t 'changeset.list.title'
-        @heading =  t 'changeset.list.heading'
-        @description = t 'changeset.list.description'
+    if request.format == :html && !@params[:list]
+      require_oauth
+      render :action => :history, :layout => map_layout
+    else
+      changesets = conditions_nonempty(Changeset.all)
+
+      if @params[:display_name]
+        changesets = if user.data_public? || user == current_user
+                       changesets.where(:user_id => user.id)
+                     else
+                       changesets.where("false")
+                     end
+      elsif @params[:bbox]
+        changesets = conditions_bbox(changesets, BoundingBox.from_bbox_params(params))
+      elsif @params[:friends] && current_user
+        changesets = changesets.where(:user_id => current_user.friend_users.identifiable)
+      elsif @params[:nearby] && current_user
+        changesets = changesets.where(:user_id => current_user.nearby)
       end
 
-      @page = (params[:page] || 1).to_i
-      @page_size = 20
+      changesets = changesets.where("changesets.id <= ?", @params[:max_id]) if @params[:max_id]
 
-      @edits = changesets.order("changesets.created_at DESC").offset((@page - 1) * @page_size).limit(@page_size).preload(:user, :changeset_tags)
+      @edits = changesets.order("changesets.id DESC").limit(20).preload(:user, :changeset_tags, :comments)
 
-      render :action => :list
+      render :action => :list, :layout => false
     end
   end
 
@@ -344,7 +310,143 @@ class ChangesetController < ApplicationController
     list
   end
 
-private
+  ##
+  # Add a comment to a changeset
+  def comment
+    # Check the arguments are sane
+    raise OSM::APIBadUserInput, "No id was given" unless params[:id]
+    raise OSM::APIBadUserInput, "No text was given" if params[:text].blank?
+
+    # Extract the arguments
+    id = params[:id].to_i
+    body = params[:text]
+
+    # Find the changeset and check it is valid
+    changeset = Changeset.find(id)
+    raise OSM::APIChangesetNotYetClosedError, changeset if changeset.is_open?
+
+    # Add a comment to the changeset
+    comment = changeset.comments.create(:changeset => changeset,
+                                        :body => body,
+                                        :author => current_user)
+
+    # Notify current subscribers of the new comment
+    changeset.subscribers.visible.each do |user|
+      Notifier.changeset_comment_notification(comment, user).deliver_now if current_user != user
+    end
+
+    # Add the commenter to the subscribers if necessary
+    changeset.subscribers << current_user unless changeset.subscribers.exists?(current_user.id)
+
+    # Return a copy of the updated changeset
+    render :xml => changeset.to_xml.to_s
+  end
+
+  ##
+  # Adds a subscriber to the changeset
+  def subscribe
+    # Check the arguments are sane
+    raise OSM::APIBadUserInput, "No id was given" unless params[:id]
+
+    # Extract the arguments
+    id = params[:id].to_i
+
+    # Find the changeset and check it is valid
+    changeset = Changeset.find(id)
+    raise OSM::APIChangesetAlreadySubscribedError, changeset if changeset.subscribers.exists?(current_user.id)
+
+    # Add the subscriber
+    changeset.subscribers << current_user
+
+    # Return a copy of the updated changeset
+    render :xml => changeset.to_xml.to_s
+  end
+
+  ##
+  # Removes a subscriber from the changeset
+  def unsubscribe
+    # Check the arguments are sane
+    raise OSM::APIBadUserInput, "No id was given" unless params[:id]
+
+    # Extract the arguments
+    id = params[:id].to_i
+
+    # Find the changeset and check it is valid
+    changeset = Changeset.find(id)
+    raise OSM::APIChangesetNotSubscribedError, changeset unless changeset.subscribers.exists?(current_user.id)
+
+    # Remove the subscriber
+    changeset.subscribers.delete(current_user)
+
+    # Return a copy of the updated changeset
+    render :xml => changeset.to_xml.to_s
+  end
+
+  ##
+  # Sets visible flag on comment to false
+  def hide_comment
+    # Check the arguments are sane
+    raise OSM::APIBadUserInput, "No id was given" unless params[:id]
+
+    # Extract the arguments
+    id = params[:id].to_i
+
+    # Find the changeset
+    comment = ChangesetComment.find(id)
+
+    # Hide the comment
+    comment.update(:visible => false)
+
+    # Return a copy of the updated changeset
+    render :xml => comment.changeset.to_xml.to_s
+  end
+
+  ##
+  # Sets visible flag on comment to true
+  def unhide_comment
+    # Check the arguments are sane
+    raise OSM::APIBadUserInput, "No id was given" unless params[:id]
+
+    # Extract the arguments
+    id = params[:id].to_i
+
+    # Find the changeset
+    comment = ChangesetComment.find(id)
+
+    # Unhide the comment
+    comment.update(:visible => true)
+
+    # Return a copy of the updated changeset
+    render :xml => comment.changeset.to_xml.to_s
+  end
+
+  ##
+  # Get a feed of recent changeset comments
+  def comments_feed
+    if params[:id]
+      # Extract the arguments
+      id = params[:id].to_i
+
+      # Find the changeset
+      changeset = Changeset.find(id)
+
+      # Return comments for this changeset only
+      @comments = changeset.comments.includes(:author, :changeset).limit(comments_limit)
+    else
+      # Return comments
+      @comments = ChangesetComment.includes(:author, :changeset).where(:visible => true).order("created_at DESC").limit(comments_limit).preload(:changeset)
+    end
+
+    # Render the result
+    respond_to do |format|
+      format.rss
+    end
+  rescue OSM::APIBadUserInput
+    head :bad_request
+  end
+
+  private
+
   #------------------------------------------------------------
   # utility functions below.
   #------------------------------------------------------------
@@ -354,35 +456,38 @@ private
   # restrict changesets to those enclosed by a bounding box
   # we need to return both the changesets and the bounding box
   def conditions_bbox(changesets, bbox)
-    if  bbox
+    if bbox
       bbox.check_boundaries
       bbox = bbox.to_scaled
-      return 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)
+
+      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
-      return changesets
+      changesets
     end
   end
 
   ##
   # restrict changesets to those by a particular user
   def conditions_user(changesets, user, name)
-    unless user.nil? and name.nil?
+    if user.nil? && name.nil?
+      changesets
+    else
       # shouldn't provide both name and UID
-      raise OSM::APIBadUserInput.new("provide either the user ID or display name, but not both") if user and name
+      raise OSM::APIBadUserInput, "provide either the user ID or display name, but not both" if user && name
 
       # use either the name or the UID to find the user which we're selecting on.
       u = if name.nil?
             # user input checking, we don't have any UIDs < 1
-            raise OSM::APIBadUserInput.new("invalid user ID") if user.to_i < 1
+            raise OSM::APIBadUserInput, "invalid user ID" if user.to_i < 1
             u = User.find(user.to_i)
           else
-            u = User.find_by_display_name(name)
+            u = User.find_by(:display_name => name)
           end
 
       # make sure we found a user
-      raise OSM::APINotFoundError.new if u.nil?
+      raise OSM::APINotFoundError if u.nil?
 
       # should be able to get changesets of public users only, or
       # our own changesets regardless of public-ness.
@@ -391,40 +496,38 @@ private
         # changesets if they're non-public
         setup_user_auth
 
-        raise OSM::APINotFoundError if @user.nil? or @user.id != u.id
+        raise OSM::APINotFoundError if current_user.nil? || current_user != u
       end
-      return changesets.where(:user_id => u.id)
-    else
-      return changesets
+
+      changesets.where(:user_id => u.id)
     end
   end
 
   ##
   # restrict changes to those closed during a particular time period
   def conditions_time(changesets, time)
-    unless time.nil?
+    if time.nil?
+      return changesets
+    elsif time.count(",") == 1
       # if there is a range, i.e: comma separated, then the first is
       # low, second is high - same as with bounding boxes.
-      if time.count(',') == 1
-        # check that we actually have 2 elements in the array
-        times = time.split(/,/)
-        raise OSM::APIBadUserInput.new("bad time range") if times.size != 2
 
-        from, to = times.collect { |t| DateTime.parse(t) }
-        return changesets.where("closed_at >= ? and created_at <= ?", from, to)
-      else
-        # if there is no comma, assume its a lower limit on time
-        return changesets.where("closed_at >= ?", DateTime.parse(time))
-      end
+      # check that we actually have 2 elements in the array
+      times = time.split(/,/)
+      raise OSM::APIBadUserInput, "bad time range" if times.size != 2
+
+      from, to = times.collect { |t| Time.parse(t) }
+      return changesets.where("closed_at >= ? and created_at <= ?", from, to)
     else
-      return changesets
+      # if there is no comma, assume its a lower limit on time
+      return changesets.where("closed_at >= ?", Time.parse(time))
     end
-    # stupid DateTime seems to throw both of these for bad parsing, so
+    # stupid Time seems to throw both of these for bad parsing, so
     # we have to catch both and ensure the correct code path is taken.
   rescue ArgumentError => ex
-    raise OSM::APIBadUserInput.new(ex.message.to_s)
+    raise OSM::APIBadUserInput, ex.message.to_s
   rescue RuntimeError => ex
-    raise OSM::APIBadUserInput.new(ex.message.to_s)
+    raise OSM::APIBadUserInput, ex.message.to_s
   end
 
   ##
@@ -434,10 +537,10 @@ private
   # if parameter 'open' is nill then open and closed changesets are returned
   def conditions_open(changesets, open)
     if open.nil?
-      return changesets
+      changesets
     else
-      return changesets.where("closed_at >= ? and num_changes <= ?",
-                              Time.now.getutc, Changeset::MAX_ELEMENTS)
+      changesets.where("closed_at >= ? and num_changes <= ?",
+                       Time.now.getutc, Changeset::MAX_ELEMENTS)
     end
   end
 
@@ -446,10 +549,24 @@ private
   # ('closed at' time has passed or changes limit is hit)
   def conditions_closed(changesets, closed)
     if closed.nil?
-      return changesets
+      changesets
+    else
+      changesets.where("closed_at < ? or num_changes > ?",
+                       Time.now.getutc, Changeset::MAX_ELEMENTS)
+    end
+  end
+
+  ##
+  # query changesets by a list of ids
+  # (either specified as array or comma-separated string)
+  def conditions_ids(changesets, ids)
+    if ids.nil?
+      changesets
+    elsif ids.empty?
+      raise OSM::APIBadUserInput, "No changesets were given to search for"
     else
-      return changesets.where("closed_at < ? or num_changes > ?",
-                              Time.now.getutc, Changeset::MAX_ELEMENTS)
+      ids = ids.split(",").collect(&:to_i)
+      changesets.where(:id => ids)
     end
   end
 
@@ -457,7 +574,20 @@ private
   # eliminate empty changesets (where the bbox has not been set)
   # this should be applied to all changeset list displays
   def conditions_nonempty(changesets)
-    return changesets.where("num_changes > 0")
+    changesets.where("num_changes > 0")
   end
 
+  ##
+  # Get the maximum number of comments to return
+  def comments_limit
+    if params[:limit]
+      if params[:limit].to_i > 0 && params[:limit].to_i <= 10000
+        params[:limit].to_i
+      else
+        raise OSM::APIBadUserInput, "Comments limit must be between 1 and 10000"
+      end
+    else
+      100
+    end
+  end
 end