Move map method to its own controller

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

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index 03d952b9660ca363e9e3a368f063710922ee944f..2ad0fe6e06b7a8930eab0b3d359c5d5a6a8cfbd4 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -1,640 +1,1000 @@
-# amf_controller is a semi-standalone API for Flash clients, particularly 
-# Potlatch. All interaction between Potlatch (as a .SWF application) and the 
-# OSM database takes place using this controller. Messages are 
+# amf_controller is a semi-standalone API for Flash clients, particularly
+# Potlatch. All interaction between Potlatch (as a .SWF application) and the
+# OSM database takes place using this controller. Messages are

 # encoded in the Actionscript Message Format (AMF).
 #
 # encoded in the Actionscript Message Format (AMF).
 #

-# Helper functions are in /lib/potlatch.
+# Helper functions are in /lib/potlatch.rb

 #
 #

-# Author::     editions Systeme D / Richard Fairhurst 2004-2008
-# Licence::    public domain.
+# Author::  editions Systeme D / Richard Fairhurst 2004-2008
+# Licence:: public domain.

 #
 # == General structure
 #
 # Apart from the amf_read and amf_write methods (which distribute the requests
 #
 # == General structure
 #
 # Apart from the amf_read and amf_write methods (which distribute the requests

-# from the AMF message), each method generally takes arguments in the order 
-# they were sent by the Potlatch SWF. Do not assume typing has been preserved. 
+# from the AMF message), each method generally takes arguments in the order
+# they were sent by the Potlatch SWF. Do not assume typing has been preserved.

 # Methods all return an array to the SWF.
 # Methods all return an array to the SWF.

-# 
+#
+# == API 0.6
+#
+# Note that this requires a patched version of composite_primary_keys 1.1.0
+# (see http://groups.google.com/group/compositekeys/t/a00e7562b677e193)
+# if you are to run with POTLATCH_USE_SQL=false .
+#

 # == Debugging
 # == Debugging

-# 
+#

 # Any method that returns a status code (0 for ok) can also send:
 # Any method that returns a status code (0 for ok) can also send:

-#      return(-1,"message")            <-- just puts up a dialogue
-#      return(-2,"message")            <-- also asks the user to e-mail me
-# 
-# To write to the Rails log, use RAILS_DEFAULT_LOGGER.info("message").
+# return(-1,"message")        <-- just puts up a dialogue
+# return(-2,"message")        <-- also asks the user to e-mail me
+# return(-3,["type",v],id)    <-- version conflict
+# return(-4,"type",id)        <-- object not found
+# -5 indicates the method wasn't called (due to a previous error)
+#
+# To write to the Rails log, use logger.info("message").

 
 

-class AmfController < ApplicationController
-  require 'stringio'
+# Remaining issues:
+# * version conflict when POIs and ways are reverted

 
 

+class AmfController < ApplicationController

   include Potlatch
 
   include Potlatch
 

-  session :off
-  before_filter :check_write_availability
+  skip_before_action :verify_authenticity_token
+  before_action :check_api_writable
+
+  # AMF Controller implements its own authentication and authorization checks
+  # completely independently of the rest of the codebase, so best just to let
+  # it keep doing its own thing.
+  skip_authorization_check

 
   # Main AMF handlers: process the raw AMF string (using AMF library) and
   # calls each action (private method) accordingly.
 
   # Main AMF handlers: process the raw AMF string (using AMF library) and
   # calls each action (private method) accordingly.

-  # ** FIXME: refactor to reduce duplication of code across read/write
-  
+

   def amf_read
   def amf_read

-       req=StringIO.new(request.raw_post+0.chr)# Get POST data as request
-                                                                                       # (cf http://www.ruby-forum.com/topic/122163)
-       req.read(2)                                                             # Skip version indicator and client ID
-       results={}                                                              # Results of each body
-
-       # Parse request
-
-       headers=AMF.getint(req)                                 # Read number of headers
-
-       headers.times do                                                # Read each header
-         name=AMF.getstring(req)                               #  |
-         req.getc                                                              #  | skip boolean
-         value=AMF.getvalue(req)                               #  |
-         header["name"]=value                                  #  |
-       end
-
-       bodies=AMF.getint(req)                                  # Read number of bodies
-       bodies.times do                                                 # Read each body
-         message=AMF.getstring(req)                    #  | get message name
-         index=AMF.getstring(req)                              #  | get index in response sequence
-         bytes=AMF.getlong(req)                                #  | get total size in bytes
-         args=AMF.getvalue(req)                                #  | get response (probably an array)
-
-         case message
-               when 'getpresets';                      results[index]=AMF.putdata(index,getpresets())
-               when 'whichways';                       results[index]=AMF.putdata(index,whichways(*args))
-               when 'whichways_deleted';       results[index]=AMF.putdata(index,whichways_deleted(*args))
-               when 'getway';                          results[index]=AMF.putdata(index,getway(args[0].to_i))
-               when 'getrelation';                     results[index]=AMF.putdata(index,getrelation(args[0].to_i))
-               when 'getway_old';                      results[index]=AMF.putdata(index,getway_old(args[0].to_i,args[1].to_i))
-               when 'getway_history';          results[index]=AMF.putdata(index,getway_history(args[0].to_i))
-               when 'getnode_history';         results[index]=AMF.putdata(index,getnode_history(args[0].to_i))
-               when 'findrelations';           results[index]=AMF.putdata(index,findrelations(*args))
-               when 'getpoi';                          results[index]=AMF.putdata(index,getpoi(*args))
-         end
-       end
-    sendresponse(results)
+    self.status = :ok
+    self.content_type = Mime[:amf]
+    self.response_body = Dispatcher.new(request.raw_post) do |message, *args|
+      logger.info("Executing AMF #{message}(#{args.join(',')})")
+
+      case message
+      when "getpresets" then        result = getpresets(*args)
+      when "whichways" then         result = whichways(*args)
+      when "whichways_deleted" then result = whichways_deleted(*args)
+      when "getway" then            result = getway(args[0].to_i)
+      when "getrelation" then       result = getrelation(args[0].to_i)
+      when "getway_old" then        result = getway_old(args[0].to_i, args[1])
+      when "getway_history" then    result = getway_history(args[0].to_i)
+      when "getnode_history" then   result = getnode_history(args[0].to_i)
+      when "findgpx" then           result = findgpx(*args)
+      when "findrelations" then     result = findrelations(*args)
+      when "getpoi" then            result = getpoi(*args)
+      end
+
+      result
+    end

   end
 
   def amf_write
   end
 
   def amf_write

-       req=StringIO.new(request.raw_post+0.chr)
-       req.read(2)
-       results={}
-       renumberednodes={}                                              # Shared across repeated putways
-       renumberedways={}                                               # Shared across repeated putways
-
-       headers=AMF.getint(req)                                 # Read number of headers
-       headers.times do                                                # Read each header
-         name=AMF.getstring(req)                               #  |
-         req.getc                                                              #  | skip boolean
-         value=AMF.getvalue(req)                               #  |
-         header["name"]=value                                  #  |
-       end
-
-       bodies=AMF.getint(req)                                  # Read number of bodies
-       bodies.times do                                                 # Read each body
-         message=AMF.getstring(req)                    #  | get message name
-         index=AMF.getstring(req)                              #  | get index in response sequence
-         bytes=AMF.getlong(req)                                #  | get total size in bytes
-         args=AMF.getvalue(req)                                #  | get response (probably an array)
-
-         case message
-               when 'putway';                          r=putway(renumberednodes,*args)
-                                                                       renumberednodes=r[3]
-                                                                       if r[1] != r[2]
-                                                                         renumberedways[r[1]] = r[2]
-                                                                       end
-                                                                       results[index]=AMF.putdata(index,r)
-               when 'putrelation';                     results[index]=AMF.putdata(index,putrelation(renumberednodes, renumberedways, *args))
-               when 'deleteway';                       results[index]=AMF.putdata(index,deleteway(args[0],args[1].to_i))
-               when 'putpoi';                          results[index]=AMF.putdata(index,putpoi(*args))
-         end
-       end
-    sendresponse(results)
+    renumberednodes = {}              # Shared across repeated putways
+    renumberedways = {}               # Shared across repeated putways
+    err = false                       # Abort batch on error
+
+    self.status = :ok
+    self.content_type = Mime[:amf]
+    self.response_body = Dispatcher.new(request.raw_post) do |message, *args|
+      logger.info("Executing AMF #{message}")
+
+      if err
+        result = [-5, nil]
+      else
+        case message
+        when "putway" then
+          orn = renumberednodes.dup
+          result = putway(renumberednodes, *args)
+          result[4] = renumberednodes.reject { |k, _v| orn.key?(k) }
+          renumberedways[result[2]] = result[3] if result[0].zero? && result[2] != result[3]
+        when "putrelation" then
+          result = putrelation(renumberednodes, renumberedways, *args)
+        when "deleteway" then
+          result = deleteway(*args)
+        when "putpoi" then
+          result = putpoi(*args)
+          renumberednodes[result[2]] = result[3] if result[0].zero? && result[2] != result[3]
+        when "startchangeset" then
+          result = startchangeset(*args)
+        end
+
+        err = true if result[0] == -3 # If a conflict is detected, don't execute any more writes
+      end
+
+      result
+    end

   end
 
   private
 
   end
 
   private
 

+  def amf_handle_error(call, rootobj, rootid)
+    yield
+  rescue OSM::APIAlreadyDeletedError => ex
+    [-4, ex.object, ex.object_id]
+  rescue OSM::APIVersionMismatchError => ex
+    [-3, [rootobj, rootid], [ex.type.downcase, ex.id, ex.latest]]
+  rescue OSM::APIUserChangesetMismatchError => ex
+    [-2, ex.to_s]
+  rescue OSM::APIBadBoundingBox => ex
+    [-2, "Sorry - I can't get the map for that area. The server said: #{ex}"]
+  rescue OSM::APIError => ex
+    [-1, ex.to_s]
+  rescue StandardError => ex
+    [-2, "An unusual error happened (in #{call}). The server said: #{ex}"]
+  end
+
+  def amf_handle_error_with_timeout(call, rootobj, rootid)
+    amf_handle_error(call, rootobj, rootid) do
+      OSM::Timer.timeout(API_TIMEOUT, OSM::APITimeoutError) do
+        yield
+      end
+    end
+  end
+
+  # Start new changeset
+  # Returns success_code,success_message,changeset id
+
+  def startchangeset(usertoken, cstags, closeid, closecomment, opennew)
+    amf_handle_error("'startchangeset'", nil, nil) do
+      user = getuser(usertoken)
+      return -1, "You are not logged in, so Potlatch can't write any changes to the database." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+      return -1, "You must accept the contributor terms before you can edit." if user.terms_agreed.nil?
+
+      if cstags
+        return -1, "One of the tags is invalid. Linux users may need to upgrade to Flash Player 10.1." unless tags_ok(cstags)
+
+        cstags = strip_non_xml_chars cstags
+      end
+
+      # close previous changeset and add comment
+      if closeid
+        cs = Changeset.find(closeid.to_i)
+        cs.set_closed_time_now
+        if cs.user_id != user.id
+          raise OSM::APIUserChangesetMismatchError
+        elsif closecomment.empty?
+          cs.save!
+        else
+          cs.tags["comment"] = closecomment
+          # in case closecomment has chars not allowed in xml
+          cs.tags = strip_non_xml_chars cs.tags
+          cs.save_with_tags!
+        end
+      end
+
+      # open a new changeset
+      if opennew.nonzero?
+        cs = Changeset.new
+        cs.tags = cstags
+        cs.user_id = user.id
+        unless closecomment.empty?
+          cs.tags["comment"] = closecomment
+          # in case closecomment has chars not allowed in xml
+          cs.tags = strip_non_xml_chars cs.tags
+        end
+        # smsm1 doesn't like the next two lines and thinks they need to be abstracted to the model more/better
+        cs.created_at = Time.now.getutc
+        cs.closed_at = cs.created_at + Changeset::IDLE_TIMEOUT
+        cs.save_with_tags!
+        return [0, "", cs.id]
+      else
+        return [0, "", nil]
+      end
+    end
+  end
+

   # Return presets (default tags, localisation etc.):
   # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
 
   # Return presets (default tags, localisation etc.):
   # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
 

-  def getpresets() #:doc:
-       return POTLATCH_PRESETS
-  end
+  def getpresets(usertoken, _lang)
+    user = getuser(usertoken)

 
 

-  # Find all the ways, POI nodes (i.e. not part of ways), and relations
-  # in a given bounding box. Nodes are returned in full; ways and relations 
-  # are IDs only. 
+    langs = if user && !user.languages.empty?
+              Locale.list(user.languages)
+            else
+              Locale.list(http_accept_language.user_preferred_languages)
+            end

 
 

-  def whichways(xmin, ymin, xmax, ymax) #:doc:
-       enlarge = [(xmax-xmin)/8,0.01].min
-       xmin -= enlarge; ymin -= enlarge
-       xmax += enlarge; ymax += enlarge
+    lang = getlocales.preferred(langs)
+    (real_lang, localised) = getlocalized(lang.to_s)

 
 

-       if POTLATCH_USE_SQL then
-         way_ids = sql_find_way_ids_in_area(xmin, ymin, xmax, ymax)
-         points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
-         relation_ids = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, way_ids)
-       else
-         # find the way ids in an area
-         nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 1", :include => :ways)
-         way_ids = nodes_in_area.collect { |node| node.way_ids }.flatten.uniq
+    # Tell Potlatch what language it's using
+    localised["__potlatch_locale"] = real_lang

 
 

-         # find the node ids in an area that aren't part of ways
-         nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
-         points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags_as_hash] }
+    # Get help from i18n but delete it so we won't pass it around
+    # twice for nothing
+    help = localised["help_html"]
+    localised.delete("help_html")

 
 

-         # find the relations used by those nodes and ways
-         relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => "visible = 1") +
-                  Relation.find_for_ways(way_ids, :conditions => "visible = 1")
-         relation_ids = relations.collect { |relation| relation.id }.uniq
-       end
+    # Populate icon names
+    POTLATCH_PRESETS[10].each do |id|
+      POTLATCH_PRESETS[11][id] = localised["preset_icon_#{id}"]
+      localised.delete("preset_icon_#{id}")
+    end

 
 

-       [way_ids, points, relation_ids]
+    POTLATCH_PRESETS + [localised, help]

   end
 
   end
 

-  # Find deleted ways in current bounding box (similar to whichways, but ways
-  # with a deleted node only - not POIs or relations).
+  def getlocalized(lang)
+    # What we end up actually using. Reported in Potlatch's created_by=* string
+    loaded_lang = "en"
+
+    # Load English defaults
+    en = YAML.safe_load(File.open(Rails.root.join("config", "potlatch", "locales", "en.yml")))["en"]
+
+    if lang == "en"
+      return [loaded_lang, en]
+    else
+      # Use English as a fallback
+      begin
+        other = YAML.safe_load(File.open(Rails.root.join("config", "potlatch", "locales", "#{lang}.yml")))[lang]
+        loaded_lang = lang
+      rescue StandardError
+        other = en
+      end
+
+      # We have to return a flat list and some of the keys won't be
+      # translated (probably)
+      return [loaded_lang, en.merge(other)]
+    end
+  end

 
 

-  def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
-       xmin -= 0.01; ymin -= 0.01
-       xmax += 0.01; ymax += 0.01
+  ##
+  # Find all the ways, POI nodes (i.e. not part of ways), and relations
+  # in a given bounding box. Nodes are returned in full; ways and relations
+  # are IDs only.
+  #
+  # return is of the form:
+  # [success_code, success_message,
+  #  [[way_id, way_version], ...],
+  #  [[node_id, lat, lon, [tags, ...], node_version], ...],
+  #  [[rel_id, rel_version], ...]]
+  # where the ways are any visible ways which refer to any visible
+  # nodes in the bbox, nodes are any visible nodes in the bbox but not
+  # used in any way, rel is any relation which refers to either a way
+  # or node that we're returning.
+  def whichways(xmin, ymin, xmax, ymax)
+    amf_handle_error_with_timeout("'whichways'", nil, nil) do
+      enlarge = [(xmax - xmin) / 8, 0.01].min
+      xmin -= enlarge
+      ymin -= enlarge
+      xmax += enlarge
+      ymax += enlarge
+
+      # check boundary is sane and area within defined
+      # see /config/application.yml
+      bbox = BoundingBox.new(xmin, ymin, xmax, ymax)
+      bbox.check_boundaries
+      bbox.check_size
+
+      if POTLATCH_USE_SQL
+        ways = sql_find_ways_in_area(bbox)
+        points = sql_find_pois_in_area(bbox)
+        relations = sql_find_relations_in_area_and_ways(bbox, ways.collect { |x| x[0] })
+      else
+        # find the way ids in an area
+        nodes_in_area = Node.bbox(bbox).visible.includes(:ways)
+        ways = nodes_in_area.inject([]) do |sum, node|
+          visible_ways = node.ways.select(&:visible?)
+          sum + visible_ways.collect { |w| [w.id, w.version] }
+        end.uniq
+        ways.delete([])
+
+        # find the node ids in an area that aren't part of ways
+        nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
+        points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags, n.version] }.uniq
+
+        # find the relations used by those nodes and ways
+        relations = Relation.nodes(nodes_in_area.collect(&:id)).visible +
+                    Relation.ways(ways.collect { |w| w[0] }).visible
+        relations = relations.collect { |relation| [relation.id, relation.version] }.uniq
+      end
+
+      [0, "", ways, points, relations]
+    end
+  end

 
 

-       nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 0 AND current_ways.visible = 0", :include => :ways_via_history)
-       way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
+  # Find deleted ways in current bounding box (similar to whichways, but ways
+  # with a deleted node only - not POIs or relations).

 
 

-       [way_ids]
+  def whichways_deleted(xmin, ymin, xmax, ymax)
+    amf_handle_error_with_timeout("'whichways_deleted'", nil, nil) do
+      enlarge = [(xmax - xmin) / 8, 0.01].min
+      xmin -= enlarge
+      ymin -= enlarge
+      xmax += enlarge
+      ymax += enlarge
+
+      # check boundary is sane and area within defined
+      # see /config/application.yml
+      bbox = BoundingBox.new(xmin, ymin, xmax, ymax)
+      bbox.check_boundaries
+      bbox.check_size
+
+      nodes_in_area = Node.bbox(bbox).joins(:ways_via_history).where(:current_ways => { :visible => false })
+      way_ids = nodes_in_area.collect { |node| node.ways_via_history.invisible.collect(&:id) }.flatten.uniq
+
+      [0, "", way_ids]
+    end

   end
 
   # Get a way including nodes and tags.
   end
 
   # Get a way including nodes and tags.

-  # Returns 0 (success), a Potlatch-style array of points, and a hash of tags.
-
-  def getway(wayid) #:doc:
-       if POTLATCH_USE_SQL then
-         points = sql_get_nodes_in_way(wayid)
-         tags = sql_get_tags_in_way(wayid)
-       else
-         # Ideally we would do ":include => :nodes" here but if we do that
-         # then rails only seems to return the first copy of a node when a
-         # way includes a node more than once
-         way = Way.find(wayid)
-         points = way.nodes.collect do |node|
-               nodetags=node.tags_as_hash
-               nodetags.delete('created_by')
-               [node.lon, node.lat, node.id, nodetags]
-         end
-         tags = way.tags
-       end
-
-       [wayid, points, tags]
+  # Returns the way id, a Potlatch-style array of points, a hash of tags, the version number, and the user ID.
+
+  def getway(wayid)
+    amf_handle_error_with_timeout("'getway' #{wayid}", "way", wayid) do
+      if POTLATCH_USE_SQL
+        points = sql_get_nodes_in_way(wayid)
+        tags = sql_get_tags_in_way(wayid)
+        version = sql_get_way_version(wayid)
+        uid = sql_get_way_user(wayid)
+      else
+        # Ideally we would do ":include => :nodes" here but if we do that
+        # then rails only seems to return the first copy of a node when a
+        # way includes a node more than once
+        way = Way.where(:id => wayid).first
+
+        # check case where way has been deleted or doesn't exist
+        return [-4, "way", wayid] if way.nil? || !way.visible
+
+        points = way.nodes.preload(:node_tags).collect do |node|
+          nodetags = node.tags
+          nodetags.delete("created_by")
+          [node.lon, node.lat, node.id, nodetags, node.version]
+        end
+        tags = way.tags
+        version = way.version
+        uid = way.changeset.user.id
+      end
+
+      [0, "", wayid, points, tags, version, uid]
+    end

   end
 
   # Get an old version of a way, and all constituent nodes.
   #
   end
 
   # Get an old version of a way, and all constituent nodes.
   #

-  # For undelete (version=0), always uses the most recent version of each node, 
-  # even if it's moved.  For revert (version=1+), uses the node in existence 
+  # For undelete (version<0), always uses the most recent version of each node,
+  # even if it's moved.  For revert (version >= 0), uses the node in existence

   # at the time, generating a new id if it's still visible and has been moved/
   # retagged.
   # at the time, generating a new id if it's still visible and has been moved/
   # retagged.

+  #
+  # Returns:
+  # 0. success code,
+  # 1. id,
+  # 2. array of points,
+  # 3. hash of tags,
+  # 4. version,
+  # 5. is this the current, visible version? (boolean)
+
+  def getway_old(id, timestamp)
+    amf_handle_error_with_timeout("'getway_old' #{id}, #{timestamp}", "way", id) do
+      if timestamp == ""
+        # undelete
+        old_way = OldWay.where(:visible => true, :way_id => id).unredacted.order("version DESC").first
+        points = old_way.get_nodes_undelete unless old_way.nil?
+      else
+        begin
+          # revert
+          timestamp = Time.zone.strptime(timestamp.to_s, "%d %b %Y, %H:%M:%S")
+          old_way = OldWay.where("way_id = ? AND timestamp <= ?", id, timestamp).unredacted.order("timestamp DESC").first
+          unless old_way.nil?
+            if old_way.visible
+              points = old_way.get_nodes_revert(timestamp)
+            else
+              return [-1, "Sorry, the way was deleted at that time - please revert to a previous version.", id]
+            end
+          end
+        rescue ArgumentError
+          # thrown by date parsing method. leave old_way as nil for
+          # the error handler below.
+          old_way = nil
+        end
+      end
+
+      if old_way.nil?
+        return [-1, "Sorry, the server could not find a way at that time.", id]
+      else
+        curway = Way.find(id)
+        old_way.tags["history"] = "Retrieved from v#{old_way.version}"
+        return [0, "", id, points, old_way.tags, curway.version, (curway.version == old_way.version && curway.visible)]
+      end
+    end
+  end

 
 

-  def getway_old(id, version) #:doc:
-       if version < 0
-         old_way = OldWay.find(:first, :conditions => ['visible = 1 AND id = ?', id], :order => 'version DESC')
-         points = old_way.get_nodes_undelete
-       else
-         old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
-         points = old_way.get_nodes_revert
-       end
-
-       old_way.tags['history'] = "Retrieved from v#{old_way.version}"
-
-       [0, id, points, old_way.tags, old_way.version]
+  # Find history of a way.
+  # Returns 'way', id, and an array of previous versions:
+  # - formerly [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid]
+  # - now [timestamp,user,uid]
+  #
+  # Heuristic: Find all nodes that have ever been part of the way;
+  # get a list of their revision dates; add revision dates of the way;
+  # sort and collapse list (to within 2 seconds); trim all dates before the
+  # start date of the way.
+
+  def getway_history(wayid)
+    revdates = []
+    revusers = {}
+    Way.find(wayid).old_ways.unredacted.collect do |a|
+      revdates.push(a.timestamp)
+      revusers[a.timestamp.to_i] = change_user(a) unless revusers.key?(a.timestamp.to_i)
+      a.nds.each do |n|
+        Node.find(n).old_nodes.unredacted.collect do |o|
+          revdates.push(o.timestamp)
+          revusers[o.timestamp.to_i] = change_user(o) unless revusers.key?(o.timestamp.to_i)
+        end
+      end
+    end
+    waycreated = revdates[0]
+    revdates.uniq!
+    revdates.sort!
+    revdates.reverse!
+
+    # Remove any dates (from nodes) before first revision date of way
+    revdates.delete_if { |d| d < waycreated }
+    # Remove any elements where 2 seconds doesn't elapse before next one
+    revdates.delete_if { |d| revdates.include?(d + 1) || revdates.include?(d + 2) }
+    # Collect all in one nested array
+    revdates.collect! { |d| [(d + 1).strftime("%d %b %Y, %H:%M:%S")] + revusers[d.to_i] }
+    revdates.uniq!
+
+    ["way", wayid, revdates]
+  rescue ActiveRecord::RecordNotFound
+    ["way", wayid, []]

   end
   end

-  
-  # Find history of a way. Returns 'way', id, and 
-  # an array of previous versions.

 
 

-  def getway_history(wayid) #:doc:
-       history = Way.find(wayid).old_ways.reverse.collect do |old_way|
-         user = old_way.user.data_public? ? old_way.user.display_name : 'anonymous'
-         uid  = old_way.user.data_public? ? old_way.user.id : 0
-         [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid]
-       end
+  # Find history of a node. Returns 'node', id, and an array of previous versions as above.

 
 

-       ['way',wayid,history]
+  def getnode_history(nodeid)
+    history = Node.find(nodeid).old_nodes.unredacted.reverse.collect do |old_node|
+      [(old_node.timestamp + 1).strftime("%d %b %Y, %H:%M:%S")] + change_user(old_node)
+    end
+    ["node", nodeid, history]
+  rescue ActiveRecord::RecordNotFound
+    ["node", nodeid, []]

   end
 
   end
 

-  # Find history of a node. Returns 'node', id, and 
-  # an array of previous versions.
-
-  def getnode_history(nodeid) #:doc:
-       history = Node.find(nodeid).old_nodes.reverse.collect do |old_node|
-         user = old_node.user.data_public? ? old_node.user.display_name : 'anonymous'
-         uid  = old_node.user.data_public? ? old_node.user.id : 0
-         [old_node.timestamp.to_i, old_node.timestamp.strftime("%d %b %Y, %H:%M"), old_node.visible ? 1 : 0, user, uid]
-       end
+  def change_user(obj)
+    user_object = obj.changeset.user
+    user = user_object.data_public? ? user_object.display_name : "anonymous"
+    uid  = user_object.data_public? ? user_object.id : 0
+    [user, uid]
+  end

 
 

-       ['node',nodeid,history]
+  # Find GPS traces with specified name/id.
+  # Returns array listing GPXs, each one comprising id, name and description.
+
+  def findgpx(searchterm, usertoken)
+    amf_handle_error_with_timeout("'findgpx'", nil, nil) do
+      user = getuser(usertoken)
+
+      return -1, "You must be logged in to search for GPX traces." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+
+      query = Trace.visible_to(user)
+      query = if searchterm.to_i.positive?
+                query.where(:id => searchterm.to_i)
+              else
+                query.where("MATCH(name) AGAINST (?)", searchterm).limit(21)
+              end
+      gpxs = query.collect do |gpx|
+        [gpx.id, gpx.name, gpx.description]
+      end
+      [0, "", gpxs]
+    end

   end
 
   # Get a relation with all tags and members.
   # Returns:
   end
 
   # Get a relation with all tags and members.
   # Returns:

-  # 0. relation id,
-  # 1. hash of tags,
-  # 2. list of members.
-  
-  def getrelation(relid) #:doc:
-       rel = Relation.find(relid)
+  # 0. success code?
+  # 1. object type?
+  # 2. relation id,
+  # 3. hash of tags,
+  # 4. list of members,
+  # 5. version.

 
 

-       [relid, rel.tags, rel.members]
+  def getrelation(relid)
+    amf_handle_error("'getrelation' #{relid}", "relation", relid) do
+      rel = Relation.where(:id => relid).first
+
+      return [-4, "relation", relid] if rel.nil? || !rel.visible
+
+      [0, "", relid, rel.tags, rel.members, rel.version]
+    end

   end
 
   # Find relations with specified name/id.
   # Returns array of relations, each in same form as getrelation.
   end
 
   # Find relations with specified name/id.
   # Returns array of relations, each in same form as getrelation.

-  
+

   def findrelations(searchterm)
   def findrelations(searchterm)

-       rels = []
-       if searchterm.to_i>0 then
-         rel = Relation.find(searchterm.to_i)
-         if rel and rel.visible then
-           rels.push([rel.id, rel.tags, rel.members])
-         end
-       else
-         RelationTag.find(:all, :limit => 11, :conditions => ["match(v) against (?)", searchterm] ).each do |t|
-               if t.relation.visible then
-             rels.push([t.relation.id, t.relation.tags, t.relation.members])
-           end
-         end
-       end
-       rels
+    rels = []
+    if searchterm.to_i.positive?
+      rel = Relation.where(:id => searchterm.to_i).first
+      rels.push([rel.id, rel.tags, rel.members, rel.version]) if rel&.visible
+    else
+      RelationTag.where("v like ?", "%#{searchterm}%").limit(11).each do |t|
+        rels.push([t.relation.id, t.relation.tags, t.relation.members, t.relation.version]) if t.relation.visible
+      end
+    end
+    rels

   end
 
   # Save a relation.
   # Returns
   # 0. 0 (success),
   # 1. original relation id (unchanged),
   end
 
   # Save a relation.
   # Returns
   # 0. 0 (success),
   # 1. original relation id (unchanged),

-  # 2. new relation id.
-
-  def putrelation(renumberednodes, renumberedways, usertoken, relid, tags, members, visible) #:doc:
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so the relation could not be saved." end
-
-       relid = relid.to_i
-       visible = visible.to_i
-
-       # create a new relation, or find the existing one
-       if relid <= 0
-         rel = Relation.new
-       else
-         rel = Relation.find(relid)
-       end
-
-       # check the members are all positive, and correctly type
-       typedmembers = []
-       members.each do |m|
-         mid = m[1].to_i
-         if mid < 0
-               mid = renumberednodes[mid] if m[0] == 'node'
-               mid = renumberedways[mid] if m[0] == 'way'
-         end
-      if mid
-           typedmembers << [m[0], mid, m[2]]
-         end
-       end
-
-       # assign new contents
-       rel.members = typedmembers
-       rel.tags = tags
-       rel.visible = visible
-       rel.user_id = uid
-
-       # check it then save it
-       # BUG: the following is commented out because it always fails on my
-       #  install. I think it's a Rails bug.
-
-       #if !rel.preconditions_ok?
-       #  return -2, "Relation preconditions failed"
-       #else
-         rel.save_with_history!
-       #end
-
-       [0, relid, rel.id]
+  # 2. new relation id,
+  # 3. version.
+
+  def putrelation(renumberednodes, renumberedways, usertoken, changeset_id, version, relid, tags, members, visible)
+    amf_handle_error("'putrelation' #{relid}", "relation", relid) do
+      user = getuser(usertoken)
+
+      return -1, "You are not logged in, so the relation could not be saved." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+      return -1, "You must accept the contributor terms before you can edit." if user.terms_agreed.nil?
+
+      return -1, "One of the tags is invalid. Linux users may need to upgrade to Flash Player 10.1." unless tags_ok(tags)
+
+      tags = strip_non_xml_chars tags
+
+      relid = relid.to_i
+      visible = visible.to_i.nonzero?
+
+      new_relation = nil
+      relation = nil
+      Relation.transaction do
+        # create a new relation, or find the existing one
+        relation = Relation.find(relid) if relid.positive?
+        # We always need a new node, based on the data that has been sent to us
+        new_relation = Relation.new
+
+        # check the members are all positive, and correctly type
+        typedmembers = []
+        members.each do |m|
+          mid = m[1].to_i
+          if mid.negative?
+            mid = renumberednodes[mid] if m[0] == "Node"
+            mid = renumberedways[mid] if m[0] == "Way"
+          end
+          typedmembers << [m[0], mid, m[2].delete("\000-\037\ufffe\uffff", "^\011\012\015")] if mid
+        end
+
+        # assign new contents
+        new_relation.members = typedmembers
+        new_relation.tags = tags
+        new_relation.visible = visible
+        new_relation.changeset_id = changeset_id
+        new_relation.version = version
+
+        if relid <= 0
+          # We're creating the relation
+          new_relation.create_with_history(user)
+        elsif visible
+          # We're updating the relation
+          new_relation.id = relid
+          relation.update_from(new_relation, user)
+        else
+          # We're deleting the relation
+          new_relation.id = relid
+          relation.delete_with_history!(new_relation, user)
+        end
+      end
+
+      if relid <= 0
+        return [0, "", relid, new_relation.id, new_relation.version]
+      else
+        return [0, "", relid, relid, relation.version]
+      end
+    end

   end
 
   # Save a way to the database, including all nodes. Any nodes in the previous
   # version and no longer used are deleted.
   end
 
   # Save a way to the database, including all nodes. Any nodes in the previous
   # version and no longer used are deleted.

-  # 
+  #
+  # Parameters:
+  # 0. hash of renumbered nodes (added by amf_controller)
+  # 1. current user token (for authentication)
+  # 2. current changeset
+  # 3. new way version
+  # 4. way ID
+  # 5. list of nodes in way
+  # 6. hash of way tags
+  # 7. array of nodes to change (each one is [lon,lat,id,version,tags]),
+  # 8. hash of nodes to delete (id->version).
+  #

   # Returns:
   # 0. '0' (code for success),
   # Returns:
   # 0. '0' (code for success),

-  # 1. original way id (unchanged),
-  # 2. new way id,
-  # 3. hash of renumbered nodes (old id=>new id)
-
-  def putway(renumberednodes, usertoken, originalway, points, attributes) #:doc:
-
-       # -- Initialise and carry out checks
-       
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so the way could not be saved." end
-
-       originalway = originalway.to_i
-
-       points.each do |a|
-         if a[2] == 0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
-         if a[1] == 90 then return -2,"Server error - node with lat -90 found in way #{originalway}." end
-       end
-
-       if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
-
-       # -- Get unique nodes
-
-       if originalway < 0
-         way = Way.new
-         uniques = []
-       else
-         way = Way.find(originalway)
-         uniques = way.unshared_node_ids
-       end
-
-       # -- Compare nodes and save changes to any that have changed
-
-       nodes = []
-
-       points.each do |n|
-         lon = n[0].to_f
-         lat = n[1].to_f
-         id = n[2].to_i
-         savenode = false
-
-         if renumberednodes[id]
-           id = renumberednodes[id]
-         elsif id < 0
-               # Create new node
-               node = Node.new
-               savenode = true
-         else
-               node = Node.find(id)
-               nodetags=node.tags_as_hash
-               nodetags.delete('created_by')
-               if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or
-                  n[4] != nodetags or !node.visible?
-                 savenode = true
-               end
-         end
-
-         if savenode
-               node.user_id = uid
-           node.lat = lat
-        node.lon = lon
-           node.tags = Tags.join(n[4])
-           node.visible = true
-           node.save_with_history!
-
-               if id != node.id
-                 renumberednodes[id] = node.id
-                 id = node.id
-           end
-         end
-
-         uniques = uniques - [id]
-         nodes.push(id)
-       end
-
-       # -- Save revised way
-
-       way.tags = attributes
-       way.nds = nodes
-       way.user_id = uid
-       way.visible = true
-       way.save_with_history!
-
-       # -- Delete any unique nodes
-       
-       uniques.each do |n|
-         deleteitemrelations(n, 'node')
-
-         node = Node.find(n)
-         node.user_id = uid
-         node.visible = false
-         node.save_with_history!
-       end
-
-       [0, originalway, way.id, renumberednodes]
+  # 1. message,
+  # 2. original way id (unchanged),
+  # 3. new way id,
+  # 4. hash of renumbered nodes (old id=>new id),
+  # 5. way version,
+  # 6. hash of changed node versions (node=>version)
+  # 7. hash of deleted node versions (node=>version)
+
+  def putway(renumberednodes, usertoken, changeset_id, wayversion, originalway, pointlist, attributes, nodes, deletednodes)
+    amf_handle_error("'putway' #{originalway}", "way", originalway) do
+      # -- Initialise
+
+      user = getuser(usertoken)
+      return -1, "You are not logged in, so the way could not be saved." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+      return -1, "You must accept the contributor terms before you can edit." if user.terms_agreed.nil?
+
+      return -2, "Server error - way is only #{pointlist.length} points long." if pointlist.length < 2
+
+      return -1, "One of the tags is invalid. Linux users may need to upgrade to Flash Player 10.1." unless tags_ok(attributes)
+
+      attributes = strip_non_xml_chars attributes
+
+      originalway = originalway.to_i
+      pointlist.collect!(&:to_i)
+
+      way = nil # this is returned, so scope it outside the transaction
+      nodeversions = {}
+      Way.transaction do
+        # -- Update each changed node
+
+        nodes.each do |a|
+          lon = a[0].to_f
+          lat = a[1].to_f
+          id = a[2].to_i
+          version = a[3].to_i
+
+          return -2, "Server error - node with id 0 found in way #{originalway}." if id.zero?
+          return -2, "Server error - node with latitude -90 found in way #{originalway}." if lat == 90
+
+          id = renumberednodes[id] if renumberednodes[id]
+
+          node = Node.new
+          node.changeset_id = changeset_id
+          node.lat = lat
+          node.lon = lon
+          node.tags = a[4]
+
+          # fixup node tags in a way as well
+          return -1, "One of the tags is invalid. Linux users may need to upgrade to Flash Player 10.1." unless tags_ok(node.tags)
+
+          node.tags = strip_non_xml_chars node.tags
+
+          node.tags.delete("created_by")
+          node.version = version
+          if id <= 0
+            # We're creating the node
+            node.create_with_history(user)
+            renumberednodes[id] = node.id
+            nodeversions[node.id] = node.version
+          else
+            # We're updating an existing node
+            previous = Node.find(id)
+            node.id = id
+            previous.update_from(node, user)
+            nodeversions[previous.id] = previous.version
+          end
+        end
+
+        # -- Save revised way
+
+        pointlist.collect! do |a|
+          renumberednodes[a] || a
+        end
+        new_way = Way.new
+        new_way.tags = attributes
+        new_way.nds = pointlist
+        new_way.changeset_id = changeset_id
+        new_way.version = wayversion
+        if originalway <= 0
+          new_way.create_with_history(user)
+          way = new_way # so we can get way.id and way.version
+        else
+          way = Way.find(originalway)
+          if way.tags != attributes || way.nds != pointlist || !way.visible?
+            new_way.id = originalway
+            way.update_from(new_way, user)
+          end
+        end
+
+        # -- Delete unwanted nodes
+
+        deletednodes.each do |id, v|
+          node = Node.find(id.to_i)
+          new_node = Node.new
+          new_node.changeset_id = changeset_id
+          new_node.version = v.to_i
+          new_node.id = id.to_i
+          begin
+            node.delete_with_history!(new_node, user)
+          rescue OSM::APIPreconditionFailedError
+            # We don't do anything here as the node is being used elsewhere
+            # and we don't want to delete it
+          end
+        end
+      end
+
+      [0, "", originalway, way.id, renumberednodes, way.version, nodeversions, deletednodes]
+    end

   end
 
   # Save POI to the database.
   # Refuses save if the node has since become part of a way.
   end
 
   # Save POI to the database.
   # Refuses save if the node has since become part of a way.

-  # Returns:
+  # Returns array with:

   # 0. 0 (success),
   # 0. 0 (success),

-  # 1. original node id (unchanged),
-  # 2. new node id.
-
-  def putpoi(usertoken, id, lon, lat, tags, visible) #:doc:
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so the point could not be saved." end
-
-       id = id.to_i
-       visible = (visible.to_i == 1)
-
-       if id > 0 then
-         node = Node.find(id)
-
-         if !visible then
-           unless node.ways.empty? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
-           deleteitemrelations(id, 'node')
-         end
-       else
-         node = Node.new
-       end
-
-       node.user_id = uid
-       node.lat = lat
-       node.lon = lon
-       node.tags = Tags.join(tags)
-       node.visible = visible
-       node.save_with_history!
-
-       [0, id, node.id]
+  # 1. success message,
+  # 2. original node id (unchanged),
+  # 3. new node id,
+  # 4. version.
+
+  def putpoi(usertoken, changeset_id, version, id, lon, lat, tags, visible)
+    amf_handle_error("'putpoi' #{id}", "node", id) do
+      user = getuser(usertoken)
+      return -1, "You are not logged in, so the point could not be saved." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+      return -1, "You must accept the contributor terms before you can edit." if user.terms_agreed.nil?
+
+      return -1, "One of the tags is invalid. Linux users may need to upgrade to Flash Player 10.1." unless tags_ok(tags)
+
+      tags = strip_non_xml_chars tags
+
+      id = id.to_i
+      visible = (visible.to_i == 1)
+      node = nil
+      new_node = nil
+      Node.transaction do
+        if id.positive?
+          begin
+            node = Node.find(id)
+          rescue ActiveRecord::RecordNotFound
+            return [-4, "node", id]
+          end
+
+          return -1, "Point #{id} has since become part of a way, so you cannot save it as a POI.", id, id, version unless visible || node.ways.empty?
+        end
+        # We always need a new node, based on the data that has been sent to us
+        new_node = Node.new
+
+        new_node.changeset_id = changeset_id
+        new_node.version = version
+        new_node.lat = lat
+        new_node.lon = lon
+        new_node.tags = tags
+        if id <= 0
+          # We're creating the node
+          new_node.create_with_history(user)
+        elsif visible
+          # We're updating the node
+          new_node.id = id
+          node.update_from(new_node, user)
+        else
+          # We're deleting the node
+          new_node.id = id
+          node.delete_with_history!(new_node, user)
+        end
+      end
+
+      if id <= 0
+        return [0, "", id, new_node.id, new_node.version]
+      else
+        return [0, "", id, node.id, node.version]
+      end
+    end

   end
 
   # Read POI from database
   # (only called on revert: POIs are usually read by whichways).
   #
   end
 
   # Read POI from database
   # (only called on revert: POIs are usually read by whichways).
   #

-  # Returns array of id, long, lat, hash of tags.
-
-  def getpoi(id,timestamp) #:doc:
-       if timestamp>0 then
-         n = OldNode.find(id, :conditions=>['UNIX_TIMESTAMP(timestamp)=?',timestamp])
-       else
-         n = Node.find(id)
-       end
-
-       if n
-         return [n.id, n.lon, n.lat, n.tags_as_hash]
-       else
-         return [nil, nil, nil, '']
-       end
+  # Returns array of id, long, lat, hash of tags, (current) version.
+
+  def getpoi(id, timestamp)
+    amf_handle_error("'getpoi' #{id}", "node", id) do
+      id = id.to_i
+      n = Node.where(:id => id).first
+      if n
+        v = n.version
+        n = OldNode.where("node_id = ? AND timestamp <= ?", id, timestamp).unredacted.order("timestamp DESC").first unless timestamp == ""
+      end
+
+      if n
+        return [0, "", id, n.lon, n.lat, n.tags, v]
+      else
+        return [-4, "node", id]
+      end
+    end

   end
 
   end
 

-  # Delete way and all constituent nodes. Also removes from any relations.
-  # Returns 0 (success), unchanged way id.
-
-  def deleteway(usertoken, way_id) #:doc:
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so the way could not be deleted." end
-
-       # FIXME: would be good not to make two history entries when removing
-       #                two nodes from the same relation
-       user = User.find(uid)
-       way = Way.find(way_id)
-       way.unshared_node_ids.each do |n|
-         deleteitemrelations(n, 'node')
-       end
-       deleteitemrelations(way_id, 'way')
-
-       way.delete_with_relations_and_nodes_and_history(user)  
-
-       [0, way_id]
+  # Delete way and all constituent nodes.
+  # Params:
+  # * The user token
+  # * the changeset id
+  # * the id of the way to change
+  # * the version of the way that was downloaded
+  # * a hash of the id and versions of all the nodes that are in the way, if any
+  # of the nodes have been changed by someone else then, there is a problem!
+  # Returns 0 (success), unchanged way id, new way version, new node versions.
+
+  def deleteway(usertoken, changeset_id, way_id, way_version, deletednodes)
+    amf_handle_error("'deleteway' #{way_id}", "way", way_id) do
+      user = getuser(usertoken)
+      return -1, "You are not logged in, so the way could not be deleted." unless user
+      return -1, t("application.setup_user_auth.blocked") if user.blocks.active.exists?
+      return -1, "You must accept the contributor terms before you can edit." if user.terms_agreed.nil?
+
+      way_id = way_id.to_i
+      nodeversions = {}
+      old_way = nil # returned, so scope it outside the transaction
+      # Need a transaction so that if one item fails to delete, the whole delete fails.
+      Way.transaction do
+        # -- Delete the way
+
+        old_way = Way.find(way_id)
+        delete_way = Way.new
+        delete_way.version = way_version
+        delete_way.changeset_id = changeset_id
+        delete_way.id = way_id
+        old_way.delete_with_history!(delete_way, user)
+
+        # -- Delete unwanted nodes
+
+        deletednodes.each do |id, v|
+          node = Node.find(id.to_i)
+          new_node = Node.new
+          new_node.changeset_id = changeset_id
+          new_node.version = v.to_i
+          new_node.id = id.to_i
+          begin
+            node.delete_with_history!(new_node, user)
+            nodeversions[node.id] = node.version
+          rescue OSM::APIPreconditionFailedError
+            # We don't do anything with the exception as the node is in use
+            # elsewhere and we don't want to delete it
+          end
+        end
+      end
+      [0, "", way_id, old_way.version, nodeversions]
+    end

   end
 
   end
 

-

   # ====================================================================
   # Support functions
 
   # ====================================================================
   # Support functions
 

-  # Remove a node or way from all relations
-
-  def deleteitemrelations(objid, type) #:doc:
-       relations = RelationMember.find(:all, 
-                                                                       :conditions => ['member_type = ? and member_id = ?', type, objid], 
-                                                                       :include => :relation).collect { |rm| rm.relation }.uniq
-
-       relations.each do |rel|
-         rel.members.delete_if { |x| x[0] == type and x[1] == objid }
-         rel.save_with_history!
-       end
+  # Authenticate token
+  # (can also be of form user:pass)
+  # When we are writing to the api, we need the actual user model,
+  # not just the id, hence this abstraction
+
+  def getuser(token)
+    if token =~ /^(.+)\:(.+)$/
+      User.authenticate(:username => Regexp.last_match(1), :password => Regexp.last_match(2))
+    else
+      User.authenticate(:token => token)
+    end

   end
 
   end
 

-  # Break out node tags into a hash
-  # (should become obsolete as of API 0.6)
-
-  def tagstring_to_hash(a) #:doc:
-       tags={}
-       Tags.split(a) do |k, v|
-         tags[k]=v
-       end
-       tags
+  def getlocales
+    @getlocales ||= Locale.list(Dir.glob(Rails.root.join("config", "potlatch", "locales", "*")).collect { |f| File.basename(f, ".yml") })

   end
 
   end
 

-  # Authenticate token
-  # (can also be of form user:pass)
-
-  def getuserid(token) #:doc:
-       if (token =~ /^(.+)\:(.+)$/) then
-         user = User.authenticate(:username => $1, :password => $2)
-       else
-         user = User.authenticate(:token => token)
-       end
+  ##
+  # check that all key-value pairs are valid UTF-8.
+  def tags_ok(tags)
+    tags.each do |k, v|
+      return false unless UTF8.valid? k
+      return false unless UTF8.valid? v
+    end
+    true
+  end

 
 

-       return user ? user.id : nil;
+  ##
+  # strip characters which are invalid in XML documents from the strings
+  # in the +tags+ hash.
+  def strip_non_xml_chars(tags)
+    new_tags = {}
+    tags&.each do |k, v|
+      new_k = k.delete "\000-\037\ufffe\uffff", "^\011\012\015"
+      new_v = v.delete "\000-\037\ufffe\uffff", "^\011\012\015"
+      new_tags[new_k] = new_v
+    end
+    new_tags

   end
 
   end
 

-  # Compare two floating-point numbers to within 0.0000001
+  # ====================================================================
+  # Alternative SQL queries for getway/whichways

 
 

-  def fpcomp(a,b) #:doc:
-       return ((a/0.0000001).round==(b/0.0000001).round)
+  def sql_find_ways_in_area(bbox)
+    sql = <<-SQL
+    SELECT DISTINCT current_ways.id AS wayid,current_ways.version AS version
+      FROM current_way_nodes
+    INNER JOIN current_nodes ON current_nodes.id=current_way_nodes.node_id
+    INNER JOIN current_ways  ON current_ways.id =current_way_nodes.id
+       WHERE current_nodes.visible=TRUE
+       AND current_ways.visible=TRUE
+       AND #{OSM.sql_for_area(bbox, 'current_nodes.')}
+    SQL
+    ActiveRecord::Base.connection.select_all(sql).collect { |a| [a["wayid"].to_i, a["version"].to_i] }

   end
 
   end
 

-  # Send AMF response
-  
-  def sendresponse(results)
-       a,b=results.length.divmod(256)
-       render :content_type => "application/x-amf", :text => proc { |response, output| 
-         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
-         results.each do |k,v|
-               output.write(v)
-         end
-       }
+  def sql_find_pois_in_area(bbox)
+    pois = []
+    sql = <<-SQL
+      SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.version
+      FROM current_nodes
+       LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id
+       WHERE current_nodes.visible=TRUE
+       AND cwn.id IS NULL
+       AND #{OSM.sql_for_area(bbox, 'current_nodes.')}
+    SQL
+    ActiveRecord::Base.connection.select_all(sql).each do |row|
+      poitags = {}
+      ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
+        poitags[n["k"]] = n["v"]
+      end
+      pois << [row["id"].to_i, row["lon"].to_f, row["lat"].to_f, poitags, row["version"].to_i]
+    end
+    pois

   end
 
   end
 

+  def sql_find_relations_in_area_and_ways(bbox, way_ids)
+    # ** It would be more Potlatchy to get relations for nodes within ways
+    #    during 'getway', not here
+    sql = <<-SQL
+      SELECT DISTINCT cr.id AS relid,cr.version AS version
+      FROM current_relations cr
+      INNER JOIN current_relation_members crm ON crm.id=cr.id
+      INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='Node'
+       WHERE #{OSM.sql_for_area(bbox, 'cn.')}
+    SQL
+    unless way_ids.empty?
+      sql += <<-SQL
+       UNION
+        SELECT DISTINCT cr.id AS relid,cr.version AS version
+        FROM current_relations cr
+        INNER JOIN current_relation_members crm ON crm.id=cr.id
+         WHERE crm.member_type='Way'
+         AND crm.member_id IN (#{way_ids.join(',')})
+      SQL
+    end
+    ActiveRecord::Base.connection.select_all(sql).collect { |a| [a["relid"].to_i, a["version"].to_i] }
+  end

 
 

-  # ====================================================================
-  # Alternative SQL queries for getway/whichways
-
-  def sql_find_way_ids_in_area(xmin,ymin,xmax,ymax)
-       sql=<<-EOF
-  SELECT DISTINCT current_way_nodes.id AS wayid
-               FROM current_way_nodes
-  INNER JOIN current_nodes ON current_nodes.id=current_way_nodes.node_id
-  INNER JOIN current_ways  ON current_ways.id =current_way_nodes.id
-          WHERE current_nodes.visible=1 
-                AND current_ways.visible=1 
-                AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
-       EOF
-       return ActiveRecord::Base.connection.select_all(sql).collect { |a| a['wayid'].to_i }
-  end
-       
-  def sql_find_pois_in_area(xmin,ymin,xmax,ymax)
-       sql=<<-EOF
-                 SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.tags 
-                       FROM current_nodes 
- LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id 
-                  WHERE current_nodes.visible=1
-                        AND cwn.id IS NULL
-                        AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
-       EOF
-       return ActiveRecord::Base.connection.select_all(sql).collect { |n| [n['id'].to_i,n['lon'].to_f,n['lat'].to_f,tagstring_to_hash(n['tags'])] }
-  end
-       
-  def sql_find_relations_in_area_and_ways(xmin,ymin,xmax,ymax,way_ids)
-       # ** It would be more Potlatchy to get relations for nodes within ways
-       #    during 'getway', not here
-       sql=<<-EOF
-         SELECT DISTINCT cr.id AS relid 
-               FROM current_relations cr
-  INNER JOIN current_relation_members crm ON crm.id=cr.id 
-  INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='node' 
-          WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")}
-       EOF
-       unless way_ids.empty?
-         sql+=<<-EOF
-          UNION
-         SELECT DISTINCT cr.id AS relid
-               FROM current_relations cr
-  INNER JOIN current_relation_members crm ON crm.id=cr.id
-          WHERE crm.member_type='way' 
-                AND crm.member_id IN (#{way_ids.join(',')})
-         EOF
-       end
-       return ActiveRecord::Base.connection.select_all(sql).collect { |a| a['relid'].to_i }.uniq
-  end
-       

   def sql_get_nodes_in_way(wayid)
   def sql_get_nodes_in_way(wayid)

-       points=[]
-       sql=<<-EOF
-               SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id,tags 
-                 FROM current_way_nodes,current_nodes 
-                WHERE current_way_nodes.id=#{wayid.to_i} 
-                  AND current_way_nodes.node_id=current_nodes.id 
-                  AND current_nodes.visible=1
-         ORDER BY sequence_id
-         EOF
-       ActiveRecord::Base.connection.select_all(sql).each do |row|
-         nodetags=tagstring_to_hash(row['tags'])
-         nodetags.delete('created_by')
-         points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags]
-       end
-       points
-  end
-       
+    points = []
+    sql = <<-SQL
+      SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id,current_nodes.version
+      FROM current_way_nodes,current_nodes
+       WHERE current_way_nodes.id=#{wayid.to_i}
+       AND current_way_nodes.node_id=current_nodes.id
+       AND current_nodes.visible=TRUE
+      ORDER BY sequence_id
+    SQL
+    ActiveRecord::Base.connection.select_all(sql).each do |row|
+      nodetags = {}
+      ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
+        nodetags[n["k"]] = n["v"]
+      end
+      nodetags.delete("created_by")
+      points << [row["lon"].to_f, row["lat"].to_f, row["id"].to_i, nodetags, row["version"].to_i]
+    end
+    points
+  end
+

   def sql_get_tags_in_way(wayid)
   def sql_get_tags_in_way(wayid)

-       tags={}
-       ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_way_tags WHERE id=#{wayid.to_i}").each do |row|
-         tags[row['k']]=row['v']
-       end
-       tags
+    tags = {}
+    ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_way_tags WHERE id=#{wayid.to_i}").each do |row|
+      tags[row["k"]] = row["v"]
+    end
+    tags

   end
 
   end
 

-end
+  def sql_get_way_version(wayid)
+    ActiveRecord::Base.connection.select_one("SELECT version FROM current_ways WHERE id=#{wayid.to_i}")["version"]
+  end

 
 

-# Local Variables:
-# indent-tabs-mode: t
-# tab-width: 4
-# End:
+  def sql_get_way_user(wayid)
+    ActiveRecord::Base.connection.select_one("SELECT user FROM current_ways,changesets WHERE current_ways.id=#{wayid.to_i} AND current_ways.changeset=changesets.id")["user"]
+  end
+end