X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/383f204e64df874e288d100e65980db6df4630b6..814822120a6becb634a22e872094b8fa16c3ea4f:/app/controllers/changeset_controller.rb

diff --git a/app/controllers/changeset_controller.rb b/app/controllers/changeset_controller.rb
index c56e15c01..f7f4dc9f0 100644
--- a/app/controllers/changeset_controller.rb
+++ b/app/controllers/changeset_controller.rb
@@ -2,13 +2,19 @@
 
 class ChangesetController < ApplicationController
   require 'xml/libxml'
-  require 'diff_reader'
 
-  before_filter :authorize, :only => [:create, :update, :delete, :upload, :include]
+  session :off
+  before_filter :authorize, :only => [:create, :update, :delete, :upload, :include, :close]
   before_filter :check_write_availability, :only => [:create, :update, :delete, :upload, :include]
-  before_filter :check_read_availability, :except => [:create, :update, :delete, :upload, :download]
+  before_filter :check_read_availability, :except => [:create, :update, :delete, :upload, :download, :query]
   after_filter :compress_output
 
+  # Help methods for checking boundary sanity and area size
+  include MapBoundary
+
+  # Helper methods for checking consistency
+  include ConsistencyValidations
+
   # Create a changeset from XML.
   def create
     if request.put?
@@ -26,6 +32,9 @@ class ChangesetController < ApplicationController
     end
   end
 
+  ##
+  # Return XML giving the basic info about the changeset. Does not 
+  # return anything about the nodes, ways and relations in the changeset.
   def read
     begin
       changeset = Changeset.find(params[:id])
@@ -35,19 +44,29 @@ class ChangesetController < ApplicationController
     end
   end
   
+  ##
+  # marks a changeset as closed. this may be called multiple times
+  # on the same changeset, so is idempotent.
   def close 
-    begin
-      unless request.put?
-        render :nothing => true, :status => :method_not_allowed
-        return
-      end
-      changeset = Changeset.find(params[:id])
-      changeset.open = false
-      changeset.save!
-      render :nothing => true
-    rescue ActiveRecord::RecordNotFound
-      render :nothing => true, :status => :not_found
+    unless request.put?
+      render :nothing => true, :status => :method_not_allowed
+      return
     end
+    
+    changeset = Changeset.find(params[:id])    
+    check_changeset_consistency(changeset, @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, 
+    # but we'll have to wait and see.
+    changeset.set_closed_time_now
+
+    changeset.save!
+    render :nothing => true
+  rescue ActiveRecord::RecordNotFound
+    render :nothing => true, :status => :not_found
+  rescue OSM::APIError => ex
+    render ex.render_opts
   end
 
   ##
@@ -55,11 +74,12 @@ class ChangesetController < ApplicationController
   # increase the size of the bounding box. this is a hint that clients can
   # set either before uploading a large number of changes, or changes that
   # the client (but not the server) knows will affect areas further away.
-  def include
+  def expand_bbox
     # only allow POST requests, because although this method is
     # idempotent, there is no "document" to PUT really...
     if request.post?
       cs = Changeset.find(params[:id])
+      check_changeset_consistency(cs, @user)
 
       # keep an array of lons and lats
       lon = Array.new
@@ -69,8 +89,8 @@ class ChangesetController < ApplicationController
       # abuse, maybe should change to some other format?
       doc = XML::Parser.string(request.raw_post).parse
       doc.find("//osm/node").each do |n|
-        lon << n['lon'].to_f * SCALE
-        lat << n['lat'].to_f * 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
@@ -121,6 +141,7 @@ class ChangesetController < ApplicationController
     end
 
     changeset = Changeset.find(params[:id])
+    check_changeset_consistency(changeset, @user)
     
     diff_reader = DiffReader.new(request.raw_post, changeset)
     Changeset.transaction do
@@ -206,4 +227,159 @@ class ChangesetController < ApplicationController
     render ex.render_opts
   end
 
+  ##
+  # query changesets by bounding box, time, user or open/closed status.
+  def query
+    # create the conditions that the user asked for. some or all of
+    # these may be nil.
+    conditions = conditions_bbox(params['bbox'])
+    conditions = cond_merge conditions, conditions_user(params['user'])
+    conditions = cond_merge conditions, conditions_time(params['time'])
+    conditions = cond_merge conditions, conditions_open(params['open'])
+
+    # create the results document
+    results = OSM::API.new.get_xml_doc
+
+    # add all matching changesets to the XML results document
+    Changeset.find(:all, 
+                   :conditions => conditions, 
+                   :limit => 100,
+                   :order => 'created_at desc').each do |cs|
+      results.root << cs.to_xml_node
+    end
+
+    render :text => results.to_s, :content_type => "text/xml"
+
+  rescue ActiveRecord::RecordNotFound
+    render :nothing => true, :status => :not_found
+  rescue OSM::APIError => ex
+    render ex.render_opts
+  end
+  
+  ##
+  # updates a changeset's tags. none of the changeset's attributes are
+  # user-modifiable, so they will be ignored.
+  #
+  # changesets are not (yet?) versioned, so we don't have to deal with
+  # history tables here. changesets are locked to a single user, however.
+  #
+  # after succesful update, returns the XML of the changeset.
+  def update
+    # request *must* be a PUT.
+    unless request.put?
+      render :nothing => true, :status => :method_not_allowed
+      return
+    end
+    
+    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
+      
+  rescue ActiveRecord::RecordNotFound
+    render :nothing => true, :status => :not_found
+  rescue OSM::APIError => ex
+    render ex.render_opts
+  end
+
+private
+  #------------------------------------------------------------
+  # utility functions below.
+  #------------------------------------------------------------  
+
+  ##
+  # merge two conditions
+  def cond_merge(a, b)
+    if a and b
+      a_str = a.shift
+      b_str = b.shift
+      return [ a_str + " and " + b_str ] + a + b
+    elsif a 
+      return a
+    else b
+      return b
+    end
+  end
+
+  ##
+  # if a bounding box was specified then parse it and do some sanity 
+  # checks. this is mostly the same as the map call, but without the 
+  # area restriction.
+  def conditions_bbox(bbox)
+    unless bbox.nil?
+      raise OSM::APIBadUserInput.new("Bounding box should be min_lon,min_lat,max_lon,max_lat") unless bbox.count(',') == 3
+      bbox = sanitise_boundaries(bbox.split(/,/))
+      raise OSM::APIBadUserInput.new("Minimum longitude should be less than maximum.") unless bbox[0] <= bbox[2]
+      raise OSM::APIBadUserInput.new("Minimum latitude should be less than maximum.") unless bbox[1] <= bbox[3]
+      return ['min_lon < ? and max_lon > ? and min_lat < ? and max_lat > ?',
+              bbox[2] * GeoRecord::SCALE, bbox[0] * GeoRecord::SCALE, bbox[3]* GeoRecord::SCALE, bbox[1] * GeoRecord::SCALE]
+    else
+      return nil
+    end
+  end
+
+  ##
+  # restrict changesets to those by a particular user
+  def conditions_user(user)
+    unless user.nil?
+      # user input checking, we don't have any UIDs < 1
+      raise OSM::APIBadUserInput.new("invalid user ID") if user.to_i < 1
+
+      u = User.find(user.to_i)
+      # should be able to get changesets of public users only, or 
+      # our own changesets regardless of public-ness.
+      unless u.data_public?
+        # get optional user auth stuff so that users can see their own
+        # changesets if they're non-public
+        setup_user_auth
+        
+        raise OSM::APINotFoundError if @user.nil? or @user.id != u.id
+      end
+      return ['user_id = ?', u.id]
+    else
+      return nil
+    end
+  end
+
+  ##
+  # restrict changes to those during a particular time period
+  def conditions_time(time) 
+    unless time.nil?
+      # 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 ['closed_at >= ? and created_at <= ?', from, to]
+      else
+        # if there is no comma, assume its a lower limit on time
+        return ['closed_at >= ?', DateTime.parse(time)]
+      end
+    else
+      return nil
+    end
+    # stupid DateTime 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)
+  rescue RuntimeError => ex
+    raise OSM::APIBadUserInput.new(ex.message.to_s)
+  end
+
+  ##
+  # restrict changes to those which are open
+  def conditions_open(open)
+    return open.nil? ? nil : ['closed_at >= ?', DateTime.now]
+  end
+
 end