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

diff --git a/app/controllers/changeset_controller.rb b/app/controllers/changeset_controller.rb
index 3e88eeec32b0425b10ca47c92cc90b057814b8fe..79000c6852598a212b79661757ee87932a1380f8 100644 (file)
--- a/app/controllers/changeset_controller.rb
+++ b/app/controllers/changeset_controller.rb
@@ -1,173 +1,441 @@
 # The ChangesetController is the RESTful interface to Changeset objects
 
 class ChangesetController < ApplicationController
 # The ChangesetController is the RESTful interface to Changeset objects
 
 class ChangesetController < ApplicationController

+  layout 'site'

   require 'xml/libxml'
 
   require 'xml/libxml'
 

-  before_filter :authorize, :only => [:create, :update, :delete, :upload]
-  before_filter :check_write_availability, :only => [:create, :update, :delete, :upload]
-  before_filter :check_read_availability, :except => [:create, :update, :delete, :upload]
+  before_filter :authorize_web, :only => [:list, :list_user, :list_bbox]
+  before_filter :set_locale, :only => [:list, :list_user, :list_bbox]
+  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]

   after_filter :compress_output
   after_filter :compress_output

+  around_filter :api_call_handle_error
+
+  filter_parameter_logging "<osmChange version"
+
+  # 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
 
   # Create a changeset from XML.
   def create

-    if request.put?
-      cs = Changeset.from_xml(request.raw_post, true)
+    assert_method :put
+
+    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.save_with_tags!
+    render :text => cs.id.to_s, :content_type => "text/plain"
+  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
+    changeset = Changeset.find(params[:id])
+    render :text => changeset.to_xml.to_s, :content_type => "text/xml"
+  end
+  
+  ##
+  # marks a changeset as closed. this may be called multiple times
+  # on the same changeset, so is idempotent.
+  def close 
+    assert_method :put
+    
+    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
+  end
+
+  ##
+  # insert a (set of) points into a changeset bounding box. this can only
+  # 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 expand_bbox
+    # only allow POST requests, because although this method is
+    # idempotent, there is no "document" to PUT really...
+    assert_method :post
+
+    cs = Changeset.find(params[:id])
+    check_changeset_consistency(cs, @user)
+    
+    # keep an array of lons and lats
+    lon = Array.new
+    lat = Array.new
+    
+    # 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.find("//osm/node").each do |n|
+      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
+    lon << cs.min_lon unless cs.min_lon.nil?
+    lat << cs.min_lat unless cs.min_lat.nil?
+    lon << cs.max_lon unless cs.max_lon.nil?
+    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
+    
+    # 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"
+  end
+
+  ##
+  # Upload a diff in a single transaction.
+  #
+  # This means that each change within the diff must succeed, i.e: that
+  # each version number mentioned is still current. Otherwise the entire
+  # transaction *must* be rolled back.
+  #
+  # Furthermore, each element in the diff can only reference the current
+  # changeset.
+  #
+  # Returns: a diffResult document, as described in 
+  # http://wiki.openstreetmap.org/wiki/OSM_Protocol_Version_0.6
+  def upload
+    # only allow POST requests, as the upload method is most definitely
+    # not idempotent, as several uploads with placeholder IDs will have
+    # different side-effects.
+    # see http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.2
+    assert_method :post

 
 

-      if cs
-        cs.user_id = @user.id
-        cs.save_with_tags!
-        render :text => cs.id.to_s, :content_type => "text/plain"
+    changeset = Changeset.find(params[:id])
+    check_changeset_consistency(changeset, @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"
+    end
+  end
+
+  ##
+  # download the changeset as an osmChange document.
+  #
+  # to make it easier to revert diffs it would be better if the osmChange
+  # format were reversible, i.e: contained both old and new versions of 
+  # modified elements. but it doesn't at the moment...
+  #
+  # this method cannot order the database changes fully (i.e: timestamp and
+  # version number may be too coarse) so the resulting diff may not apply
+  # to a different database. however since changesets are not atomic this 
+  # behaviour cannot be guaranteed anyway and is the result of a design
+  # choice.
+  def download
+    changeset = Changeset.find(params[:id])
+    
+    # get all the elements in the changeset and stick them in a big array.
+    elements = [changeset.old_nodes, 
+                changeset.old_ways, 
+                changeset.old_relations].flatten
+    
+    # sort the elements by timestamp and version number, as this is the 
+    # almost sensible ordering available. this would be much nicer if 
+    # global (SVN-style) versioning were used - then that would be 
+    # unambiguous.
+    elements.sort! do |a, b| 
+      if (a.timestamp == b.timestamp)
+        a.version <=> b.version

       else
       else

-        render :nothing => true, :status => :bad_request
+        a.timestamp <=> b.timestamp 

       end
       end

-    else
-      render :nothing => true, :status => :method_not_allowed

     end
     end

-  end
+    
+    # create an osmChange document for the output
+    result = OSM::API.new.get_xml_doc
+    result.root.name = "osmChange"

 
 

-  def create_prim(ids, prim, nd)
-    prim.version = 0
-    prim.user_id = @user.id
-    prim.visible = true
-    prim.save_with_history!
+    # generate an output element for each operation. note: we avoid looking
+    # at the history because it is simpler - but it would be more correct to 
+    # check these assertions.
+    elements.each do |elt|
+      result.root <<
+        if (elt.version == 1) 
+          # first version, so it must be newly-created.
+          created = XML::Node.new "create"
+          created << elt.to_xml_node
+        else
+          # get the previous version from the element history
+          prev_elt = elt.class.find(:first, :conditions => 
+                                    ['id = ? and version = ?',
+                                     elt.id, elt.version])
+          unless elt.visible
+            # if the element isn't visible then it must have been deleted, so
+            # output the *previous* XML
+            deleted = XML::Node.new "delete"
+            deleted << prev_elt.to_xml_node
+          else
+            # must be a modify, for which we don't need the previous version
+            # yet...
+            modified = XML::Node.new "modify"
+            modified << elt.to_xml_node
+          end
+        end
+    end

 
 

-    ids[nd['id'].to_i] = prim.id
+    render :text => result.to_s, :content_type => "text/xml"

   end
 
   end
 

-  def fix_way(w, node_ids)
-    w.nds = w.instance_eval { @nds }.
-      map { |nd| node_ids[nd] || nd }
-    return w
+  ##
+  # 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'], params['display_name'])
+    conditions = cond_merge conditions, conditions_time(params['time'])
+    conditions = cond_merge conditions, conditions_open(params['open'])
+    conditions = cond_merge conditions, conditions_closed(params['closed'])
+
+    # 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"

   end
   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.
+    assert_method :put
+
+    changeset = Changeset.find(params[:id])
+    new_changeset = Changeset.from_xml(request.raw_post)

 
 

-  def fix_rel(r, ids)
-    r.members = r.instance_eval { @members }.
-      map { |memb| [memb[0], ids[memb[0]][memb[1].to_i] || memb[1], memb[2]] }
-    return r
+    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

   end
   end

+

   
   

-  def read
-    begin
-      changeset = Changeset.find(params[:id])
-      render :text => changeset.to_xml.to_s, :content_type => "text/xml"
-    rescue ActiveRecord::RecordNotFound
-      render :nothing => true, :status => :not_found
+  
+  ##
+  # list edits (open changesets) in reverse chronological order
+  def list
+    conditions = conditions_nonempty
+
+    if params[:display_name]
+      user = User.find_by_display_name(params[:display_name], :conditions => { :visible => true })
+
+      if user 
+        if user.data_public? or user == @user
+          conditions = cond_merge conditions, ['user_id = ?', user.id]
+        else
+          conditions = cond_merge conditions, ['false']
+        end
+      elsif request.format == :html
+        @title = t 'user.no_such_user.title'
+        @not_found_user = params[:display_name]
+        render :template => 'user/no_such_user', :status => :not_found
+      end
+    end
+
+    if params[:bbox]
+      bbox = params[:bbox]
+    elsif params[:minlon] and params[:minlat] and params[:maxlon] and params[:maxlat]
+      bbox = params[:minlon] + ',' + params[:minlat] + ',' + params[:maxlon] + ',' + params[:maxlat]
+    end
+
+    if bbox
+      conditions = cond_merge conditions, conditions_bbox(bbox)
+      bbox = BoundingBox.from_s(bbox)
+      bbox_link = render_to_string :partial => "bbox", :object => bbox
+    end
+
+    if user
+      user_link = render_to_string :partial => "user", :object => user

     end
     end

+
+    if 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'
+    end
+
+    @page = (params[:page] || 1).to_i
+    @page_size = 20
+
+    @edits = Changeset.find(:all,
+                            :include => [:user, :changeset_tags],
+                            :conditions => conditions,
+                            :order => "changesets.created_at DESC",
+                            :offset => (@page - 1) * @page_size,
+                            :limit => @page_size)

   end
 
   end
 

-  def upload
-    if not request.put?
-      render :nothing => true, :status => :method_not_allowed
-      return
+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

+  end

 
 

-    # FIXME: this should really be done without loading the whole XML file
-    # into memory.
-    p = XML::Parser.new
-    p.string  = request.raw_post
-    doc = p.parse
+  ##
+  # 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

 
 

-    node_ids, way_ids, rel_ids = {}, {}, {}
-    ids = {"node"=>node_ids, "way"=>way_ids, "relation"=>rel_ids}
+  ##
+  # restrict changesets to those by a particular user
+  def conditions_user(user, name)
+    unless user.nil? and name.nil?
+      # 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

 
 

-    res = XML::Document.new
-    res.encoding = 'UTF-8'
-    root = XML::Node.new 'osm'
-    root['version'] = '0.6'
-    root['creator'] = 'OpenStreetMap.org'
-    res.root = root
+      # 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
+            u = User.find(user.to_i)
+          else
+            u = User.find_by_display_name(name)
+          end

 
 

-    root << XML::Node.new_comment(" Warning: this is a 0.6 result document, " +
-      "not a normal OSM file. ")
+      # make sure we found a user
+      raise OSM::APINotFoundError.new if u.nil?

 
 

-    Changeset.transaction do
-      doc.find('//osm/create/node').each do |nd|
-       elem = XML::Node.new 'node'
-       node = Node.from_xml_node(nd, true)
-       elem['old_id'] = nd['id']
-       create_prim node_ids, node, nd
-       elem['new_id'] = node.id.to_s
-       elem['new_version'] = node.version.to_s
-       root << elem
-      end
-      doc.find('//osm/create/way').each do |nd|
-       elem = XML::Node.new 'way'
-       way = Way.from_xml_node(nd, true)
-       elem['old_id'] = nd['id']
-       fix_way(way, node_ids)
-       raise OSM::APIPreconditionFailedError.new if !way.preconditions_ok?
-       create_prim way_ids, way, nd
-       elem['new_id'] = way.id.to_s
-       elem['new_version'] = way.version.to_s
-       root << elem
-      end
-      doc.find('//osm/create/relation').each do |nd|
-       elem = XML::Node.new 'relation'
-       relation = Relation.from_xml_node(nd, true)
-       elem['old_id'] = nd['id']
-       fix_rel(relation, ids)
-       raise OSM::APIPreconditionFailedError.new if !relation.preconditions_ok?
-       create_prim rel_ids, relation, nd
-       elem['new_id'] = relation.id.to_s
-       elem['new_version'] = relation.version.to_s
-       root << elem
+      # 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
       end

+      return ['user_id = ?', u.id]
+    else
+      return nil
+    end
+  end

 
 

-      doc.find('//osm/modify/relation').each do |nd|
-       elem = XML::Node.new 'relation'
-       new_relation = Relation.from_xml_node(nd)
-       relation = Relation.find(new_relation.id)
-       relation.update_from new_relation, @user
-       elem['old_id'] = elem['new_id'] = relation.id.to_s
-       elem['new_version'] = relation.version.to_s
-       root << elem
-      end
-      doc.find('//osm/modify/way').each do |nd|
-       elem = XML::Node.new 'way'
-       new_way = Way.from_xml_node(nd)
-       way = Way.find(new_way.id)
-       way.update_from new_way, @user
-       elem['old_id'] = elem['new_id'] = way.id.to_s
-       elem['new_version'] = way.version.to_s
-       root << elem
-      end
-      doc.find('//osm/modify/node').each do |nd|
-       elem = XML::Node.new 'node'
-       new_node = Node.from_xml_node(nd)
-       node = Node.find(new_node.id)
-       node.update_from new_node, @user
-       elem['old_id'] = elem['new_id'] = node.id.to_s
-       elem['new_version'] = node.version.to_s
-       root << elem
-      end
+  ##
+  # restrict changes to those closed 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 

 
 

-      doc.find('//osm/delete/relation').each do |nd|
-       elem = XML::Node.new 'relation'
-       relation = Relation.find(nd['id'])
-       relation.delete_with_history(@user)
-       elem['old_id'] = elem['new_id'] = relation.id.to_s
-       elem['new_version'] = relation.version.to_s
-       root << elem
-      end
-      doc.find('//osm/delete/way').each do |nd|
-       elem = XML::Node.new 'way'
-       way = Way.find(nd['id'])
-       way.delete_with_relations_and_history(@user)
-       elem['old_id'] = elem['new_id'] = way.id.to_s
-       elem['new_version'] = way.version.to_s
-       root << elem
-      end
-      doc.find('//osm/delete/node').each do |nd|
-       elem = XML::Node.new 'node'
-       new_node = Node.from_xml_node(nd)
-       node = Node.find(nd['id'])
-       node.delete_with_history(@user)
-       elem['old_id'] = elem['new_id'] = node.id.to_s
-       elem['new_version'] = node.version.to_s
-       root << elem
+        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
       end

+    else
+      return nil

     end
     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

 
 

-    render :text => res.to_s, :content_type => "text/xml"
+  ##
+  # return changesets which are open (haven't been closed yet)
+  # we do this by seeing if the 'closed at' time is in the future. Also if we've
+  # hit the maximum number of changes then it counts as no longer open.
+  # if parameter 'open' is nill then open and closed changsets are returned
+  def conditions_open(open)
+    return open.nil? ? nil : ['closed_at >= ? and num_changes <= ?', 
+                              Time.now.getutc, Changeset::MAX_ELEMENTS]

   end
   end

+  
+  ##
+  # query changesets which are closed
+  # ('closed at' time has passed or changes limit is hit)
+  def conditions_closed(closed)
+    return closed.nil? ? nil : ['closed_at < ? or num_changes > ?', 
+                                Time.now.getutc, Changeset::MAX_ELEMENTS]
+  end
+
+  ##
+  # eliminate empty changesets (where the bbox has not been set)
+  # this should be applied to all changeset list displays
+  def conditions_nonempty()
+    return ['min_lat IS NOT NULL']
+  end
+  

 end
 end