484 lines
16 KiB
Ruby
484 lines
16 KiB
Ruby
# 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
|