# The ChangesetController is the RESTful interface to Changeset objects
class ChangesetController < ApplicationController
+ layout 'site'
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]
+ 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]
+
+ # Helper methods for checking consistency
+ include ConsistencyValidations
# Create a changeset from XML.
def create
- if request.put?
- cs = Changeset.from_xml(request.raw_post, true)
+ assert_method :put
- if cs
- cs.user_id = @user.id
- cs.save_with_tags!
- render :text => cs.id.to_s, :content_type => "text/plain"
- else
- render :nothing => true, :status => :bad_request
- end
- else
- render :nothing => true, :status => :method_not_allowed
+ 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 :text => ""
+ 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
- def create_prim(ids, prim, nd)
- prim.version = 0
- prim.user_id = @user.id
- prim.visible = true
- prim.save_with_history!
+ ##
+ # 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
+
+ changeset = Changeset.find(params[:id])
+ check_changeset_consistency(changeset, @user)
- ids[nd['id'].to_i] = prim.id
+ 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
- def fix_way(w, node_ids)
- w.nds = w.instance_eval { @nds }.
- map { |nd| node_ids[nd] || nd }
- return w
+ ##
+ # 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 which haven't been redacted
+ # and stick them in a big array.
+ elements = [changeset.old_nodes.unredacted,
+ changeset.old_ways.unredacted,
+ changeset.old_relations.unredacted].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
+ a.timestamp <=> b.timestamp
+ end
+ end
+
+ # create changeset and user caches
+ changeset_cache = {}
+ user_display_name_cache = {}
+
+ # create an osmChange document for the output
+ result = OSM::API.new.get_xml_doc
+ result.root.name = "osmChange"
+
+ # 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(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
+ end
+ end
+
+ render :text => result.to_s, :content_type => "text/xml"
end
- 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
+ ##
+ # 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
+
+ # create the conditions that the user asked for. some or all of
+ # these may be nil.
+ 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'])
+
+ # create the results document
+ results = OSM::API.new.get_xml_doc
+
+ # add all matching changesets to the XML results document
+ changesets.order("created_at DESC").limit(100).each do |cs|
+ results.root << cs.to_xml_node
+ end
+
+ render :text => results.to_s, :content_type => "text/xml"
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
+
+ ##
+ # 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)
+
+ 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 :text => "", :status => :bad_request
end
end
-
- def close
- begin
- if not request.put?
- render :nothing => true, :status => :method_not_allowed
- return
+
+ ##
+ # list edits (open changesets) in reverse chronological order
+ def list
+ if request.format == :atom and params[:page]
+ redirect_to params.merge({ :page => nil }), :status => :moved_permanently
+ elsif request.format == :html and !params[:bbox]
+ render :action => :history, :layout => map_layout
+ else
+ changesets = conditions_nonempty(Changeset.all)
+
+ 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
- changeset = Changeset.find(params[:id])
- changeset.open = false
- changeset.save
- render :nothing => true
- rescue ActiveRecord::RecordNotFound
- render :nothing => true, :status => :not_found
+
+ if params[:nearby]
+ if @user
+ changesets = changesets.where(:user_id => @user.nearby)
+ elsif request.format == :html
+ require_user
+ return
+ end
+ end
+
+ if params[:bbox]
+ changesets = conditions_bbox(changesets, BoundingBox.from_bbox_params(params))
+ end
+
+ if params[:max_id]
+ changesets = changesets.where("changesets.id <= ?", params[:max_id])
+ end
+
+ @edits = changesets.order("changesets.created_at DESC").limit(20).preload(:user, :changeset_tags)
+
+ render :action => :list, :layout => false
end
end
- def upload
- if not request.put?
- render :nothing => true, :status => :method_not_allowed
- return
+ ##
+ # list edits as an atom feed
+ def feed
+ list
+ end
+
+private
+ #------------------------------------------------------------
+ # utility functions below.
+ #------------------------------------------------------------
+
+ ##
+ # if a bounding box was specified do some sanity checks.
+ # 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
+ 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)
+ else
+ return changesets
end
+ end
- p = XML::Reader.new request.raw_post
+ ##
+ # restrict changesets to those by a particular user
+ def conditions_user(changesets, 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
- node_ids, way_ids, rel_ids = {}, {}, {}
- ids = {"node"=>node_ids, "way"=>way_ids, "relation"=>rel_ids}
+ # 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
- models = {"node"=>Node, "way"=>Way, "relation"=>Relation}
+ # make sure we found a user
+ raise OSM::APINotFoundError.new if u.nil?
- res = XML::Document.new
- res.encoding = 'UTF-8'
- root = XML::Node.new 'osm'
- root['version'] = '0.6'
- root['creator'] = 'OpenStreetMap.org'
- res.root = root
+ # 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
- root << XML::Node.new_comment(" Warning: this is a 0.6 result document, " +
- "not a normal OSM file. ")
+ raise OSM::APINotFoundError if @user.nil? or @user.id != u.id
+ end
+ return changesets.where(:user_id => u.id)
+ else
+ return changesets
+ end
+ end
- Changeset.transaction do
- while p.read == 1
- break if p.node_type == 15 # end element
- next unless p.node_type == 1 # element
-
- case p.name
- when 'create':
- while p.read == 1
- break if p.node_type == 15 # end element
- next unless p.node_type == 1 # element
-
- model = models[p.name]
- next if model.nil?
-
- elem = XML::Node.new p.name
- nd = p.expand; p.next
- osm = model.from_xml_node(nd, true)
- elem['old_id'] = nd['id']
-
- case nd.name
- when 'way':
- fix_way(osm, node_ids)
- raise OSM::APIPreconditionFailedError.new if !osm.preconditions_ok?
- when 'relation':
- fix_rel(osm, ids)
- raise OSM::APIPreconditionFailedError.new if !osm.preconditions_ok?
- end
-
- create_prim ids[nd.name], osm, nd
- elem['new_id'] = osm.id.to_s
- elem['new_version'] = osm.version.to_s
- root << elem
- end
- when 'modify':
- while p.read == 1
- break if p.node_type == 15 # end element
- next unless p.node_type == 1 # element
-
- model = models[p.name]
- next if model.nil?
-
- elem = XML::Node.new p.name
- new_osm = model.from_xml_node(p.expand); p.next
- osm = model.find(new_osm.id)
- osm.update_from new_osm, @user
- elem['old_id'] = elem['new_id'] = osm.id.to_s
- elem['new_version'] = osm.version.to_s
- root << elem
- end
- when 'delete':
- while p.read == 1
- break if p.node_type == 15 # end element
- next unless p.node_type == 1 # element
-
- model = models[p.name]
- next if model.nil?
-
- elem = XML::Node.new p.name
- osm = model.find(p.expand['id']); p.next
- osm.delete_with_history(@user)
- elem['old_id'] = elem['new_id'] = osm.id.to_s
- elem['new_version'] = osm.version.to_s
- root << elem
- end
- end
+ ##
+ # restrict changes to those closed during a particular time period
+ def conditions_time(changesets, 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 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
+ else
+ return changesets
+ 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
+
+ ##
+ # 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 changesets are returned
+ def conditions_open(changesets, open)
+ if open.nil?
+ return changesets
+ else
+ return changesets.where("closed_at >= ? and num_changes <= ?",
+ Time.now.getutc, Changeset::MAX_ELEMENTS)
end
+ end
- render :text => res.to_s, :content_type => "text/xml"
+ ##
+ # query changesets which are closed
+ # ('closed at' time has passed or changes limit is hit)
+ def conditions_closed(changesets, closed)
+ if closed.nil?
+ return changesets
+ else
+ return changesets.where("closed_at < ? or num_changes > ?",
+ Time.now.getutc, Changeset::MAX_ELEMENTS)
+ end
+ end
- rescue OSM::APIError => ex
- render ex.render_opts
+ ##
+ # 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")
end
+
end
projects / rails.git / blobdiff