# The ChangesetController is the RESTful interface to Changeset objects
class ChangesetController < ApplicationController
+ layout 'site'
require 'xml/libxml'
- require 'diff_reader'
- before_filter :authorize, :only => [:create, :update, :delete, :upload, :include]
- before_filter :check_write_availability, :only => [:create, :update, :delete, :upload, :include]
- before_filter :check_read_availability, :except => [:create, :update, :delete, :upload, :download]
+ 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
- end
+ 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
- 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
- end
- end
-
- def close
- begin
- unless request.put?
- render :nothing => true, :status => :method_not_allowed
- return
- end
+ changeset = Changeset.find(params[:id])
+ render :text => changeset.to_xml.to_s, :content_type => "text/xml"
+ end
- changeset = Changeset.find(params[:id])
+ ##
+ # marks a changeset as closed. this may be called multiple times
+ # on the same changeset, so is idempotent.
+ def close
+ assert_method :put
- unless @user.id == changeset.user_id
- raise OSM::APIUserChangesetMismatchError
- end
+ changeset = Changeset.find(params[:id])
+ check_changeset_consistency(changeset, @user)
- changeset.open = false
- changeset.save!
- render :nothing => true
- rescue ActiveRecord::RecordNotFound
- render :nothing => true, :status => :not_found
- end
+ # 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
##
# 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 user credentials - only the user who opened a changeset
- # may alter it.
- unless @user.id == cs.user_id
- raise OSM::APIUserChangesetMismatchError
- end
-
- # keep an array of lons and lats
- lon = Array.new
- lat = Array.new
+ assert_method :post
- # 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 * SCALE
- lat << n['lat'].to_f * SCALE
- end
+ cs = Changeset.find(params[:id])
+ check_changeset_consistency(cs, @user)
- # 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?
+ # keep an array of lons and lats
+ lon = Array.new
+ lat = Array.new
- # 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
+ # 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
- # 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"
+ # 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?
- else
- render :nothing => true, :status => :method_not_allowed
- end
+ # 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
- rescue ActiveRecord::RecordNotFound
- render :nothing => true, :status => :not_found
- rescue OSM::APIError => ex
- render ex.render_opts
+ # 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
##
# Furthermore, each element in the diff can only reference the current
# changeset.
#
- # Returns: a diffResult document, as described in
- # http://wiki.openstreetmap.org/index.php/OSM_Protocol_Version_0.6
+ # 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
- unless request.post?
- render :nothing => true, :status => :method_not_allowed
- return
- end
+ assert_method :post
changeset = Changeset.find(params[:id])
+ check_changeset_consistency(changeset, @user)
- # access control - only the user who created a changeset may
- # upload to it.
- unless @user.id == changeset.user_id
- raise OSM::APIUserChangesetMismatchError
- end
-
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
-
- rescue ActiveRecord::RecordNotFound
- render :nothing => true, :status => :not_found
- rescue OSM::APIError => ex
- render ex.render_opts
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
+ # 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
+ # 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
+
+ # 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|
+ elements.sort! do |a, b|
if (a.timestamp == b.timestamp)
a.version <=> b.version
else
- a.timestamp <=> b.timestamp
+ 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
+ # 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)
+ if (elt.version == 1)
# first version, so it must be newly-created.
created = XML::Node.new "create"
- created << elt.to_xml_node
+ created << elt.to_xml_node(changeset_cache, user_display_name_cache)
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
+ # if the element isn't visible then it must have been deleted
deleted = XML::Node.new "delete"
- deleted << prev_elt.to_xml_node
+ deleted << elt.to_xml_node(changeset_cache, user_display_name_cache)
else
- # must be a modify, for which we don't need the previous version
- # yet...
+ # must be a modify
modified = XML::Node.new "modify"
- modified << elt.to_xml_node
+ modified << elt.to_xml_node(changeset_cache, user_display_name_cache)
end
end
end
render :text => result.to_s, :content_type => "text/xml"
-
- rescue ActiveRecord::RecordNotFound
- render :nothing => true, :status => :not_found
- rescue OSM::APIError => ex
- render ex.render_opts
+ 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
+
+ # 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'])
+
+ # 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
+
+ ##
+ # 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
+
+ ##
+ # list edits (open changesets) in reverse chronological order
+ def list
+ if request.format == :atom and params[:max_id]
+ redirect_to 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]) && !@user && request.format == :html
+ require_user
+ return
+ end
+
+ if request.format == :html and !params[:list]
+ require_oauth
+ render :action => :history, :layout => map_layout
+ else
+ changesets = conditions_nonempty(Changeset.all)
+
+ if params[:display_name]
+ if user.data_public? or user == @user
+ changesets = changesets.where(:user_id => user.id)
+ else
+ changesets = changesets.where("false")
+ end
+ elsif params[:bbox]
+ changesets = conditions_bbox(changesets, BoundingBox.from_bbox_params(params))
+ elsif params[:friends] && @user
+ changesets = changesets.where(:user_id => @user.friend_users.public)
+ elsif params[:nearby] && @user
+ changesets = changesets.where(:user_id => @user.nearby)
+ end
+
+ if params[:max_id]
+ changesets = changesets.where("changesets.id <= ?", params[:max_id])
+ end
+
+ @edits = changesets.order("changesets.id DESC").limit(20).preload(:user, :changeset_tags)
+
+ render :action => :list, :layout => false
+ end
+ end
+
+ ##
+ # 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
+
+ ##
+ # 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
+
+ # 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
+
+ # make sure we found a user
+ raise OSM::APINotFoundError.new 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 @user.nil? or @user.id != u.id
+ end
+ return changesets.where(:user_id => u.id)
+ else
+ return changesets
+ 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
+
+ ##
+ # 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
+
+ ##
+ # query changesets by a list of ids
+ # (either specified as array or comma-separated string)
+ def conditions_ids(changesets, ids)
+ if ids.nil?
+ return changesets
+ elsif ids.empty?
+ raise OSM::APIBadUserInput.new("No changesets were given to search for")
+ else
+ ids = ids.split(',').collect { |n| n.to_i }
+ return 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)
+ return changesets.where("num_changes > 0")
end
end
projects / rails.git / blobdiff