--- /dev/null
+# The ChangesetController is the RESTful interface to Changeset objects
+
+class ChangesetsController < ApplicationController
+ layout "site"
+ require "xml/libxml"
+
+ skip_before_action :verify_authenticity_token, :except => [:index]
+ before_action :authorize_web, :only => [:index, :feed]
+ before_action :set_locale, :only => [:index, :feed]
+ before_action :authorize, :only => [:create, :update, :upload, :close, :subscribe, :unsubscribe]
+ before_action :require_allow_write_api, :only => [:create, :update, :upload, :close, :subscribe, :unsubscribe]
+ before_action :require_public_data, :only => [:create, :update, :upload, :close, :subscribe, :unsubscribe]
+ before_action :check_api_writable, :only => [:create, :update, :upload, :subscribe, :unsubscribe]
+ before_action :check_api_readable, :except => [:create, :update, :upload, :download, :query, :index, :feed, :subscribe, :unsubscribe]
+ before_action(:only => [:index, :feed]) { |c| c.check_database_readable(true) }
+ around_action :api_call_handle_error, :except => [:index, :feed]
+ around_action :api_call_timeout, :except => [:index, :feed, :upload]
+ around_action :web_timeout, :only => [:index, :feed]
+
+ # Helper methods for checking consistency
+ include ConsistencyValidations
+
+ # Create a changeset from XML.
+ def create
+ 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 = current_user
+ cs.save_with_tags!
+
+ # Subscribe user to changeset comments
+ cs.subscribers << current_user
+
+ render :plain => cs.id.to_s
+ 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 :xml => changeset.to_xml(params[:include_discussion].presence).to_s
+ 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, 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,
+ # but we'll have to wait and see.
+ changeset.set_closed_time_now
+
+ changeset.save!
+ head :ok
+ 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, current_user)
+
+ # keep an array of lons and lats
+ 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, :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
+ 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 = 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 :xml => cs.to_xml.to_s
+ 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
+
+ changeset = Changeset.find(params[:id])
+ check_changeset_consistency(changeset, current_user)
+
+ diff_reader = DiffReader.new(request.raw_post, changeset)
+ Changeset.transaction do
+ result = diff_reader.commit
+ render :xml => result.to_s
+ 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 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)
+ elsif elt.visible
+ # must be a modify
+ modified = XML::Node.new "modify"
+ modified << elt.to_xml_node(changeset_cache, user_display_name_cache)
+ else
+ # 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 :xml => result.to_s
+ end
+
+ ##
+ # query changesets by bounding box, time, user or open/closed status.
+ def query
+ # find any bounding box
+ 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.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_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
+
+ # 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 :xml => results.to_s
+ 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)
+
+ check_changeset_consistency(changeset, current_user)
+ changeset.update_from(new_changeset, current_user)
+ render :xml => changeset.to_xml.to_s
+ end
+
+ ##
+ # list non-empty changesets in reverse chronological order
+ def index
+ @params = params.permit(:display_name, :bbox, :friends, :nearby, :max_id, :list)
+
+ if request.format == :atom && @params[:max_id]
+ redirect_to url_for(@params.merge(:max_id => nil)), :status => :moved_permanently
+ return
+ end
+
+ 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 (@params[:friends] || @params[:nearby]) && !current_user
+ require_user
+ return
+ end
+
+ 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
+
+ changesets = changesets.where("changesets.id <= ?", @params[:max_id]) if @params[:max_id]
+
+ @edits = changesets.order("changesets.id DESC").limit(20).preload(:user, :changeset_tags, :comments)
+
+ render :action => :index, :layout => false
+ end
+ end
+
+ ##
+ # list edits as an atom feed
+ def feed
+ index
+ 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
+
+ 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
+
+ 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
+ changesets
+ end
+ end
+
+ ##
+ # restrict changesets to those by a particular user
+ def conditions_user(changesets, user, name)
+ if user.nil? && name.nil?
+ changesets
+ else
+ # shouldn't provide both name and UID
+ 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, "invalid user ID" if user.to_i < 1
+
+ u = User.find(user.to_i)
+ else
+ u = User.find_by(:display_name => name)
+ end
+
+ # make sure we found a user
+ raise OSM::APINotFoundError if u.nil?
+
+ # 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 current_user.nil? || current_user != u
+ end
+
+ changesets.where(:user_id => u.id)
+ end
+ end
+
+ ##
+ # restrict changes to those closed during a particular time period
+ def conditions_time(changesets, time)
+ if time.nil?
+ 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.
+
+ # 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) }
+ changesets.where("closed_at >= ? and created_at <= ?", from, to)
+ else
+ # if there is no comma, assume its a lower limit on time
+ changesets.where("closed_at >= ?", Time.parse(time))
+ end
+ # 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, ex.message.to_s
+ rescue RuntimeError => ex
+ raise OSM::APIBadUserInput, 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?
+ changesets
+ else
+ changesets.where("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(changesets, closed)
+ if closed.nil?
+ 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
+ ids = ids.split(",").collect(&:to_i)
+ changesets.where(:id => ids)
+ end
+ end
+
+ ##
+ # eliminate empty changesets (where the bbox has not been set)
+ # this should be applied to all changeset list displays
+ def conditions_nonempty(changesets)
+ changesets.where("num_changes > 0")
+ end
+end
projects / rails.git / blobdiff