Merge remote-tracking branch 'upstream/pull/1704'

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

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index 950fd848fc745d055af558aed2a9145530c0ffb2..9f909ea1089940364388a4a95fb858321d5a4fc4 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -1,801 +1,991 @@
+# 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).
+#
+# Helper functions are in /lib/potlatch.rb
+#
+# 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
+# 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.
+#
+# == 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
+#
+# 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
+# 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").
+
+# Remaining issues:
+# * version conflict when POIs and ways are reverted
+

 class AmfController < ApplicationController
 class AmfController < ApplicationController

-  require 'stringio'
+  include Potlatch

 
 

-  session :off
-  before_filter :check_write_availability
+  skip_before_action :verify_authenticity_token
+  before_action :check_api_writable

 
 

-  # to log:
-  # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
+  # Main AMF handlers: process the raw AMF string (using AMF library) and
+  # calls each action (private method) accordingly.

 
 

-  # ====================================================================
-  # Main AMF handler
+  def amf_read
+    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

 
 

-  # ---- talk  process AMF request
+      result
+    end
+  end
+
+  def amf_write
+    renumberednodes = {}              # Shared across repeated putways
+    renumberedways = {}               # Shared across repeated putways
+    err = false                       # Abort batch on error

 
 

-  def talk
-    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
+    self.status = :ok
+    self.content_type = Mime[:amf]
+    self.response_body = Dispatcher.new(request.raw_post) do |message, *args|
+      logger.info("Executing AMF #{message}")

 
 

-    # -------------
-    # Parse request
+      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

 
 

-    headers=getint(req)                                        # Read number of headers
+        err = true if result[0] == -3 # If a conflict is detected, don't execute any more writes
+      end

 
 

-    headers.times do                               # Read each header
-      name=getstring(req)                              #  |
-      req.getc                                         #  | skip boolean
-      value=getvalue(req)                              #  |
-      header["name"]=value                             #  |
+      result

     end
     end

+  end

 
 

-    bodies=getint(req)                                 # Read number of bodies
-    bodies.times do                                    # Read each body
-      message=getstring(req)                   #  | get message name
-      index=getstring(req)                             #  | get index in response sequence
-      bytes=getlong(req)                               #  | get total size in bytes
-      args=getvalue(req)                               #  | get response (probably an array)
+  private

 
 

-      case message
-                 when 'getpresets';    results[index]=putdata(index,getpresets)
-                 when 'whichways';             results[index]=putdata(index,whichways(args))
-                 when 'getway';                results[index]=putdata(index,getway(args))
-                 when 'putway';                results[index]=putdata(index,putway(args))
-                 when 'deleteway';             results[index]=putdata(index,deleteway(args))
-                 when 'putpoi';                results[index]=putdata(index,putpoi(args))
-                 when 'getpoi';                results[index]=putdata(index,getpoi(args))
+  def amf_handle_error(call, rootobj, rootid)
+    yield
+  rescue OSM::APIAlreadyDeletedError => ex
+    return [-4, ex.object, ex.object_id]
+  rescue OSM::APIVersionMismatchError => ex
+    return [-3, [rootobj, rootid], [ex.type.downcase, ex.id, ex.latest]]
+  rescue OSM::APIUserChangesetMismatchError => ex
+    return [-2, ex.to_s]
+  rescue OSM::APIBadBoundingBox => ex
+    return [-2, "Sorry - I can't get the map for that area. The server said: #{ex}"]
+  rescue OSM::APIError => ex
+    return [-1, ex.to_s]
+  rescue StandardError => ex
+    return [-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
     end

+  end

 
 

-    # ------------------
-    # Write out response
+  # Start new changeset
+  # Returns success_code,success_message,changeset id

 
 

-    RAILS_DEFAULT_LOGGER.info("  Response: start")
-    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
-       }
-    RAILS_DEFAULT_LOGGER.info("  Response: end")
+  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 REQUIRE_TERMS_AGREED && user.terms_agreed.nil?

 
 

-  end
+      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

 
 

-  private
+      # 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

 
 

-  # ====================================================================
-  # Remote calls
-
-  # ----- getpresets
-  #          return presets,presetmenus and presetnames arrays
-
-  def getpresets
-    presets={}
-    presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
-    presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
-    presettype=''
-    presetcategory=''
-
-    RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
-
-    #          File.open("config/potlatch/presets.txt") do |file|
-
-    # Temporary patch to get around filepath problem
-    # To remove this patch and make the code nice again:
-    # 1. uncomment above line
-    # 2. fix the path in the above line
-    # 3. delete this here document, and the following line (StringIO....)
-
-    txt=<<-EOF
-way/road
-motorway: highway=motorway,ref=(type road number)
-trunk road: highway=trunk,ref=(type road number),name=(type road name)
-primary road: highway=primary,ref=(type road number),name=(type road name)
-secondary road: highway=secondary,ref=(type road number),name=(type road name)
-tertiary road: highway=tertiary,ref=,name=(type road name)
-residential road: highway=residential,ref=,name=(type road name)
-unclassified road: highway=unclassified,ref=,name=(type road name)
-
-way/footway
-footpath: highway=footway,foot=yes
-bridleway: highway=bridleway,foot=yes
-byway: highway=unsurfaced,foot=yes
-permissive path: highway=footway,foot=permissive
-
-way/cycleway
-cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
-cycle track: highway=cycleway,cycleway=track,ncn_ref=
-cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
-cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
-
-way/waterway
-canal: waterway=canal,name=(type name here)
-navigable river: waterway=river,boat=yes,name=(type name here)
-navigable drain: waterway=drain,boat=yes,name=(type name here)
-derelict canal: waterway=derelict_canal,name=(type name here)
-unnavigable river: waterway=river,boat=no,name=(type name here)
-unnavigable drain: waterway=drain,boat=no,name=(type name here)
-
-way/railway
-railway: railway=rail
-tramway: railway=tram
-light railway: railway=light_rail
-preserved railway: railway=preserved
-disused railway tracks: railway=disused
-course of old railway: railway=abandoned
-
-way/natural
-lake: natural=water,landuse=
-forest: landuse=forest,natural=
-
-point/road
-mini roundabout: highway=mini_roundabout
-traffic lights: highway=traffic_signals
-
-point/footway
-bridge: highway=bridge
-gate: highway=gate
-stile: highway=stile
-cattle grid: highway=cattle_grid
-
-point/cycleway
-gate: highway=gate
-
-point/waterway
-lock gate: waterway=lock_gate
-weir: waterway=weir
-aqueduct: waterway=aqueduct
-winding hole: waterway=turning_point
-mooring: waterway=mooring
-
-point/railway
-station: railway=station
-viaduct: railway=viaduct
-level crossing: railway=crossing
-
-point/natural
-peak: natural=peak
-
-POI/road
-car park: amenity=parking
-petrol station: amenity=fuel
-
-POI/cycleway
-bike park: amenity=bicycle_parking
-
-POI/place
-city: place=city,name=(type name here),is_in=(type region or county)
-town: place=town,name=(type name here),is_in=(type region or county)
-suburb: place=suburb,name=(type name here),is_in=(type region or county)
-village: place=village,name=(type name here),is_in=(type region or county)
-hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
-
-POI/tourism
-attraction: tourism=attraction,amenity=,religion=,denomination=
-church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
-hotel: tourism=hotel,amenity=,religion=,denomination=
-other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
-post box: amenity=post_box,tourism=,name=,religion=,denomination=
-post office: amenity=post_office,tourism=,name=,religion=,denomination=
-pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
-
-POI/natural
-peak: point=peak
-EOF
-
-    StringIO.open(txt) do |file|
-      file.each_line {|line|
-        t=line.chomp
-        if (t=~/(\w+)\/(\w+)/) then
-          presettype=$1
-          presetcategory=$2
-          presetmenus[presettype].push(presetcategory)
-          presetnames[presettype][presetcategory]=["(no preset)"]
-        elsif (t=~/^(.+):\s?(.+)$/) then
-          pre=$1; kv=$2
-          presetnames[presettype][presetcategory].push(pre)
-          presets[pre]={}
-          kv.split(',').each {|a|
-            if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 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
         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,presetmenus,presetnames]

   end
 
   end
 

-  # ----- whichways(left,bottom,right,top)
-  #              return array of ways in current bounding box
-  #              at present, instead of using correct (=more complex) SQL to find
-  #              corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
+  # Return presets (default tags, localisation etc.):
+  # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.

 
 

-  def whichways(args)
-    xmin = args[0].to_f-0.01
-    ymin = args[1].to_f-0.01
-    xmax = args[2].to_f+0.01
-    ymax = args[3].to_f+0.01
-    baselong    = args[4]
-    basey       = args[5]
-    masterscale = args[6]
+  def getpresets(usertoken, _lang)
+    user = getuser(usertoken)

 
 

-    RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
+    langs = if user && !user.languages.empty?
+              Locale.list(user.languages)
+            else
+              Locale.list(http_accept_language.user_preferred_languages)
+            end

 
 

-    waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
-       "  FROM current_way_nodes,current_nodes,current_ways "+
-       " WHERE current_nodes.id=current_way_nodes.node_id "+
-       "   AND current_nodes.visible=1 "+
-       "   AND current_ways.id=current_way_nodes.id "+
-       "   AND current_ways.visible=1 "+
-       "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
+    lang = getlocales.preferred(langs)
+    (real_lang, localised) = getlocalized(lang.to_s)

 
 

-    ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way id's
+    # Tell Potlatch what language it's using
+    localised["__potlatch_locale"] = real_lang

 
 

-    pointlist = ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lng,current_nodes.tags "+
-       "  FROM current_nodes "+
-       "  LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+
-       " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
-       "   AND cwn.id IS NULL "+
-       "   AND current_nodes.visible=1")
+    # 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")

 
 

-    points = pointlist.collect {|a| [a['id'],long2coord(a['lng'].to_f,baselong,masterscale),lat2coord(a['lat'].to_f,basey,masterscale),tag2array(a['tags'])]   } # get a list of node ids and their tags
+    # Populate icon names
+    POTLATCH_PRESETS[10].each do |id|
+      POTLATCH_PRESETS[11][id] = localised["preset_icon_#{id}"]
+      localised.delete("preset_icon_#{id}")
+    end

 
 

-    return [ways,points]
+    POTLATCH_PRESETS + [localised, help]

   end
 
   end
 

-  # ----- getway (objectname, way, baselong, basey, masterscale)
-  #              returns objectname, array of co-ordinates, attributes,
-  #                              xmin,xmax,ymin,ymax
+  def getlocalized(lang)
+    # What we end up actually using. Reported in Potlatch's created_by=* string
+    loaded_lang = "en"

 
 

-  def getway(args)
-    objname,wayid,baselong,basey,masterscale=args
-    wayid = wayid.to_i
-    points = []
-    lastid = -1
-    xmin = ymin = 999999
-    xmax = ymax = -999999
-
-    RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
-
-    readwayquery(wayid).each {|row|
-      points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])]
-      xmin = [xmin,row['longitude'].to_f].min
-      xmax = [xmax,row['longitude'].to_f].max
-      ymin = [ymin,row['latitude'].to_f].min
-      ymax = [ymax,row['latitude'].to_f].max
-    }
-
-    attributes={}
-    attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
-    attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
-
-    [objname,points,attributes,xmin,xmax,ymin,ymax]
-  end
-
-  # -----      putway (user token, way, array of co-ordinates, array of attributes,
-  #                                    baselong, basey, masterscale)
-  #                    returns current way ID, new way ID, hash of renumbered nodes,
-  #                                    xmin,xmax,ymin,ymax
-
-  def putway(args)
-    RAILS_DEFAULT_LOGGER.info("  putway started")
-    usertoken,originalway,points,attributes,baselong,basey,masterscale=args
-    uid=getuserid(usertoken)
-    return if !uid
-    RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")
-    db_uqn='unin'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s        # temp uniquenodes table name, typically 51 chars
-    db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s        # 'now' variable name, typically 51 chars
-    ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
-    originalway=originalway.to_i
-
-    RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
-
-    # -- 3.    read original way into memory
-
-    xc={}; yc={}; tagc={}
-    if originalway>0
-      way=originalway
-      readwayquery(way).each { |row|
-        id=row['id'].to_i
-        xc[id]=row['longitude'].to_f
-        yc[id]=row['latitude' ].to_f
-        tagc[id]=row['tags']
-      }
-      ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
+    # 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
     else

-      way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
+      # 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

+  end

 
 

-    # -- 4.    get version by inserting new row into ways
-
-    version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
-
-    # -- 5. compare nodes and update xmin,xmax,ymin,ymax
-
-    xmin=ymin= 999999
-    xmax=ymax=-999999
-    insertsql=''
-    renumberednodes={}
-       nodelist=[]
-
-    points.each_index do |i|
-      xs=coord2long(points[i][0],masterscale,baselong)
-      ys=coord2lat(points[i][1],masterscale,basey)
-      xmin=[xs,xmin].min; xmax=[xs,xmax].max
-      ymin=[ys,ymin].min; ymax=[ys,ymax].max
-      node=points[i][2].to_i
-         tagstr=array2tag(points[i][4])
-      tagsql="'"+sqlescape(tagstr)+"'"
-      lat=(ys * 10000000).round
-      long=(xs * 10000000).round
-      tile=QuadTile.tile_for_point(ys, xs)
-
-      # compare node
-      if node<0
-        # new node - create
-               if renumberednodes[node.to_s].nil?
-          newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (           #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
-                  ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
-          points[i][2]=newnode
-          nodelist.push(newnode)
-          renumberednodes[node.to_s]=newnode.to_s
-               else
-          points[i][2]=renumberednodes[node.to_s].to_i
-               end
-
-      elsif xc.has_key?(node)
-               nodelist.push(node)
-        # old node from original way - update
-        if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
-          ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
-          ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
-        end
+  ##
+  # 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
       else

-        # old node, created in another way and now added to this way
+        # 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
       end

+
+      [0, "", ways, points, relations]

     end
     end

+  end

 
 

+  # Find deleted ways in current bounding box (similar to whichways, but ways
+  # with a deleted node only - not POIs or relations).

 
 

-       # -- 6a. delete any nodes not in modified way
+  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

 
 

-    createuniquenodes(way,db_uqn,nodelist)     # nodes which appear in this way but no other
+      # 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

 
 

-    sql=<<-EOF
-       INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)  
-       SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
-         FROM current_nodes AS cn,#{db_uqn}
-        WHERE cn.id=node_id
-    EOF
-    ActiveRecord::Base.connection.insert(sql)
+      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

 
 

-    sql=<<-EOF
-      UPDATE current_nodes AS cn, #{db_uqn}
-         SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} 
-       WHERE cn.id=node_id
-    EOF
-    ActiveRecord::Base.connection.update(sql)
+      [0, "", way_ids]
+    end
+  end

 
 

-       deleteuniquenoderelations(db_uqn,uid,db_now)
-    ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
+  # Get a way including nodes and tags.
+  # Returns the way id, a Potlatch-style array of points, a hash of tags, the version number, and the user ID.

 
 

-       #       6b. insert new version of route into way_nodes
+  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

 
 

-    insertsql =''
-    currentsql=''
-    sequence  =1
-    points.each do |p|
-      if insertsql !='' then insertsql +=',' end
-      if currentsql!='' then currentsql+=',' end
-      insertsql +="(#{way},#{p[2]},#{sequence},#{version})"
-      currentsql+="(#{way},#{p[2]},#{sequence})"
-      sequence  +=1
+      [0, "", wayid, points, tags, version, uid]

     end
     end

+  end

 
 

-    ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}");
-    ActiveRecord::Base.connection.insert( "INSERT INTO         way_nodes (id,node_id,sequence_id,version) VALUES #{insertsql}");
-    ActiveRecord::Base.connection.insert( "INSERT INTO current_way_nodes (id,node_id,sequence_id        ) VALUES #{currentsql}");
-
-    # -- 7. insert new way tags
-
-    insertsql =''
-    currentsql=''
-    attributes.each do |k,v|
-      if v=='' or v.nil? then next end
-      if v[0,6]=='(type ' then next end
-      if insertsql !='' then insertsql +=',' end
-      if currentsql!='' then currentsql+=',' end
-      insertsql +="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"',#{version})"
-      currentsql+="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"')"
-    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 >= 0), uses the node in existence
+  # 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

 
 

-    ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
-    if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
-    if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
-
-    [originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
-  end
-
-  # -----      putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
-  #                    returns current id, new id
-  #                    if new: add new row to current_nodes and nodes
-  #                    if old: add new row to nodes, update current_nodes
-
-  def putpoi(args)
-    usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
-    uid=getuserid(usertoken)
-    return if !uid
-    db_now='@now'+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
-    ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
-
-    id=id.to_i
-    visible=visible.to_i
-       if visible==0 then
-               # if deleting, check node hasn't become part of a way 
-               inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
-               unless inway.nil? then return [id,id] end       # should really return an error
-               deleteitemrelations(id,'node',uid,db_now)
-       end
-
-    x=coord2long(x.to_f,masterscale,baselong)
-    y=coord2lat(y.to_f,masterscale,basey)
-    tagsql="'"+sqlescape(array2tag(tags))+"'"
-    lat=(y * 10000000).round
-    long=(x * 10000000).round
-    tile=QuadTile.tile_for_point(y, x)
-       
-    if (id>0) then
-        ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
-        ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
-        newid=id
-    else
-        newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
-              ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
+      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

-    [id,newid]
-  end
-
-  # -----      getpoi (id,baselong,basey,masterscale)
-  #                    returns id,x,y,tag array
-  
-  def getpoi(args)
-       id,baselong,basey,masterscale=args; id=id.to_i
-       poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
-               "FROM current_nodes WHERE visible=1 AND id=#{id}")
-       if poi.nil? then return [nil,nil,nil,''] end
-       [id,
-        long2coord(poi['lng'].to_f,baselong,masterscale),
-        lat2coord(poi['lat'].to_f,basey,masterscale),
-        tag2array(poi['tags'])]
-  end
-
-  # -----      deleteway (user token, way, nodes to keep)
-  #                    returns way ID only
-
-  def deleteway(args)
-    usertoken,way,preserve=args
-
-    RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
-
-    uid=getuserid(usertoken); if !uid then return end
-    way=way.to_i
-
-    db_uqn='unin'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s        # temp uniquenodes table name, typically 51 chars
-    db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s        # 'now' variable name, typically 51 chars
-    ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
-
-    # - delete any otherwise unused nodes
-  
-    createuniquenodes(way,db_uqn,[])
-
-       unless (preserve.empty?) then
-               ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
-       end
-
-    sql=<<-EOF
-       INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
-       SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
-         FROM current_nodes AS cn,#{db_uqn}
-        WHERE cn.id=node_id
-    EOF
-    ActiveRecord::Base.connection.insert(sql)
-
-    sql=<<-EOF
-      UPDATE current_nodes AS cn, #{db_uqn}
-         SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} 
-       WHERE cn.id=node_id
-    EOF
-    ActiveRecord::Base.connection.update(sql)
-
-       deleteuniquenoderelations(db_uqn,uid,db_now)
-    ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
-
-    # - delete way
-       
-    ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
-    ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
-    ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
-    ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
-       deleteitemrelations(way,'way',uid,db_now)
-    way
-end
-
-
-
-# ====================================================================
-# Support functions for remote calls
-
-def readwayquery(id)
-  ActiveRecord::Base.connection.select_all "SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags "+
-      "    FROM current_way_nodes,current_nodes "+
-      "   WHERE current_way_nodes.id=#{id} "+
-      "     AND current_way_nodes.node_id=current_nodes.id "+
-      "     AND current_nodes.visible=1 "+
-      "   ORDER BY sequence_id"
-end
-
-def createuniquenodes(way,uqn_name,nodelist)
-       # Find nodes which appear in this way but no others
-       sql=<<-EOF
-       CREATE TEMPORARY TABLE #{uqn_name}
-                                       SELECT a.node_id
-                                         FROM (SELECT DISTINCT node_id FROM current_way_nodes
-                                                       WHERE id=#{way}) a
-                                LEFT JOIN current_way_nodes b
-                                               ON b.node_id=a.node_id
-                                          AND b.id!=#{way}
-                                        WHERE b.node_id IS NULL
-       EOF
-       unless nodelist.empty? then
-         sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
-       end
-       ActiveRecord::Base.connection.execute(sql)
-end
-
-
-
-# ====================================================================
-# Relations handling
-# deleteuniquenoderelations(uqn_name,uid,db_now)
-# deleteitemrelations(way|node,'way'|'node',uid,db_now)
+  end

 
 

-def deleteuniquenoderelations(uqn_name,uid,db_now)
-       sql=<<-EOF
-       SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr 
-        WHERE crm.member_id=node_id 
-          AND crm.member_type='node' 
-          AND crm.id=cr.id 
-          AND cr.visible=1
-       EOF
+  # 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!
+
+    return ["way", wayid, revdates]
+  rescue ActiveRecord::RecordNotFound
+    return ["way", wayid, []]
+  end

 
 

-       relnodes=ActiveRecord::Base.connection.select_all(sql)
-       relnodes.each do |a|
-               removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
-       end
-end
+  # Find history of a node. Returns 'node', id, and an array of previous versions as above.

 
 

-def deleteitemrelations(objid,type,uid,db_now)
-       sql=<<-EOF
-       SELECT cr.id FROM current_relation_members crm,current_relations cr 
-        WHERE crm.member_id=#{objid} 
-          AND crm.member_type='#{type}' 
-          AND crm.id=cr.id 
-          AND cr.visible=1
-       EOF
-       
-       relways=ActiveRecord::Base.connection.select_all(sql)
-       relways.each do |a|
-               removefromrelation(objid,type,a['id'],uid,db_now)
-       end
-end
+  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
+    return ["node", nodeid, history]
+  rescue ActiveRecord::RecordNotFound
+    return ["node", nodeid, []]
+  end

 
 

-def removefromrelation(objid,type,relation,uid,db_now)
-       rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
-
-       tagsql=<<-EOF
-       INSERT INTO relation_tags (id,k,v,version) 
-       SELECT id,k,v,#{rver} FROM current_relation_tags 
-        WHERE id=#{relation} 
-       EOF
-       ActiveRecord::Base.connection.insert(tagsql)
-
-       membersql=<<-EOF
-       INSERT INTO relation_members (id,member_type,member_id,member_role,version) 
-       SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members 
-        WHERE id=#{relation} 
-          AND (member_id!=#{objid} OR member_type!='#{type}')
-       EOF
-       ActiveRecord::Base.connection.insert(membersql)
-       
-       ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
-       ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
-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

 
 

+  # Find GPS traces with specified name/id.
+  # Returns array listing GPXs, each one comprising id, name and description.

 
 

-def sqlescape(a)
-  a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr,92.chr+92.chr)
-end
+  def findgpx(searchterm, usertoken)
+    amf_handle_error_with_timeout("'findgpx'", nil, nil) do
+      user = getuser(usertoken)

 
 

-def tag2array(a)
-  tags={}
-  a.gsub(';;;','#%').split(';').each do |b|
-    b.gsub!('#%',';;;')
-    b.gsub!('===','#%')
-    k,v=b.split('=')
-    if k.nil? then k='' end
-    if v.nil? then v='' end
-    tags[k.gsub('#%','=').gsub(':','|')]=v.gsub('#%','=')
-  end
-  tags
-end
+      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?

 
 

-def array2tag(a)
-  str=''
-  a.each do |k,v|
-    if v=='' then next end
-    if v[0,6]=='(type ' then next end
-    if str!='' then str+=';' end
-    str+=k.gsub(';',';;;').gsub('=','===').gsub('|',':')+'='+v.gsub(';',';;;').gsub('=','===')
+      query = Trace.visible_to(user)
+      query = if searchterm.to_i > 0
+                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
   end

-  str
-end

 
 

-def getuserid(token)
-  if (token =~ /^(.+)\+(.+)$/) then
-    user = User.authenticate(:username => $1, :password => $2)
-  else
-    user = User.authenticate(:token => token)
+  # Get a relation with all tags and members.
+  # Returns:
+  # 0. success code?
+  # 1. object type?
+  # 2. relation id,
+  # 3. hash of tags,
+  # 4. list of members,
+  # 5. version.
+
+  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
 
   end
 

-  return user ? user.id : nil;
-end
+  # Find relations with specified name/id.
+  # Returns array of relations, each in same form as getrelation.

 
 

+  def findrelations(searchterm)
+    rels = []
+    if searchterm.to_i > 0
+      rel = Relation.where(:id => searchterm.to_i).first
+      rels.push([rel.id, rel.tags, rel.members, rel.version]) if rel && 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),
+  # 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 REQUIRE_TERMS_AGREED && 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 > 0
+        # 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 < 0
+            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

 
 

-# ====================================================================
-# AMF read subroutines
+        # 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

 
 

-# -----        getint          return two-byte integer
-# -----        getlong         return four-byte long
-# -----        getstring       return string with two-byte length
-# ----- getdouble      return eight-byte double-precision float
-# ----- getobject      return object/hash
-# ----- getarray       return numeric array
+      if relid <= 0
+        return [0, "", relid, new_relation.id, new_relation.version]
+      else
+        return [0, "", relid, relid, relation.version]
+      end
+    end
+  end

 
 

-def getint(s)
-  s.getc*256+s.getc
-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),
+  # 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 REQUIRE_TERMS_AGREED && 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

 
 

-def getlong(s)
-  ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
-end
+        # -- Save revised way

 
 

-def getstring(s)
-  len=s.getc*256+s.getc
-  s.read(len)
-end
+        pointlist.collect! do |a|
+          renumberednodes[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

 
 

-def getdouble(s)
-  a=s.read(8).unpack('G')                      # G big-endian, E little-endian
-  a[0]
-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

 
 

-def getarray(s)
-  len=getlong(s)
-  arr=[]
-  for i in (0..len-1)
-    arr[i]=getvalue(s)
+      [0, "", originalway, way.id, renumberednodes, way.version, nodeversions, deletednodes]
+    end

   end
   end

-  arr
-end

 
 

-def getobject(s)
-  arr={}
-  while (key=getstring(s))
-    if (key=='') then break end
-    arr[key]=getvalue(s)
-  end
-  s.getc               # skip the 9 'end of object' value
-  arr
-end
+  # Save POI to the database.
+  # Refuses save if the node has since become part of a way.
+  # Returns array with:
+  # 0. 0 (success),
+  # 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 REQUIRE_TERMS_AGREED && 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 > 0
+          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

 
 

-# -----        getvalue        parse and get value
-
-def getvalue(s)
-  case s.getc
-       when 0; return getdouble(s)                     # number
-       when 1; return s.getc                           # boolean
-       when 2; return getstring(s)                     # string
-       when 3; return getobject(s)                     # object/hash
-       when 5; return nil                                      # null
-       when 6; return nil                                      # undefined
-       when 8; s.read(4)                                       # mixedArray
-                       return getobject(s)                     #  |
-       when 10;return getarray(s)                      # array
-       else;   return nil                                      # error
+      if id <= 0
+        return [0, "", id, new_node.id, new_node.version]
+      else
+        return [0, "", id, node.id, node.version]
+      end
+    end

   end
   end

-end
-
-# ====================================================================
-# AMF write subroutines
-
-# -----        putdata         envelope data into AMF writeable form
-# -----        encodevalue     pack variables as AMF

 
 

-def putdata(index,n)
-  d =encodestring(index+"/onResult")
-  d+=encodestring("null")
-  d+=[-1].pack("N")
-  d+=encodevalue(n)
-end
+  # Read POI from database
+  # (only called on revert: POIs are usually read by whichways).
+  #
+  # 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

 
 

-def encodevalue(n)
-  case n.class.to_s
-  when 'Array'
-    a=10.chr+encodelong(n.length)
-    n.each do |b|
-      a+=encodevalue(b)
+      if n
+        return [0, "", id, n.lon, n.lat, n.tags, v]
+      else
+        return [-4, "node", id]
+      end

     end
     end

-    a
-  when 'Hash'
-    a=3.chr
-    n.each do |k,v|
-      a+=encodestring(k)+encodevalue(v)
+  end
+
+  # 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 REQUIRE_TERMS_AGREED && 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

-    a+0.chr+0.chr+9.chr
-  when 'String'
-    2.chr+encodestring(n)
-  when 'Bignum','Fixnum','Float'
-    0.chr+encodedouble(n)
-  when 'NilClass'
-    5.chr
-  else
-    RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)

   end
   end

-end

 
 

-# -----        encodestring    encode string with two-byte length
-# -----        encodedouble    encode number as eight-byte double precision float
-# -----        encodelong              encode number as four-byte long
+  # ====================================================================
+  # Support functions

 
 

-def encodestring(n)
-  a,b=n.size.divmod(256)
-  a.chr+b.chr+n
-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 encodedouble(n)
-  [n].pack('G')
-end
+  def getuser(token)
+    if token =~ /^(.+)\:(.+)$/
+      User.authenticate(:username => Regexp.last_match(1), :password => Regexp.last_match(2))
+    else
+      User.authenticate(:token => token)
+    end
+  end

 
 

-def encodelong(n)
-  [n].pack('N')
-end
+  def getlocales
+    @locales ||= Locale.list(Dir.glob(Rails.root.join("config", "potlatch", "locales", "*")).collect { |f| File.basename(f, ".yml") })
+  end

 
 

-# ====================================================================
-# Co-ordinate conversion
+  ##
+  # 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

 
 

-def lat2coord(a,basey,masterscale)
-  -(lat2y(a)-basey)*masterscale+250
-end
+  ##
+  # strip characters which are invalid in XML documents from the strings
+  # in the +tags+ hash.
+  def strip_non_xml_chars(tags)
+    new_tags = {}
+    unless tags.nil?
+      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
+    end
+    new_tags
+  end

 
 

-def long2coord(a,baselong,masterscale)
-  (a-baselong)*masterscale+350
-end
+  # ====================================================================
+  # Alternative SQL queries for getway/whichways
+
+  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

 
 

-def lat2y(a)
-  180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
-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

 
 

-def coord2lat(a,masterscale,basey)
-  y2lat((a-250)/-masterscale+basey)
-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

 
 

-def coord2long(a,masterscale,baselong)
-  (a-350)/masterscale+baselong
-end
+  def sql_get_nodes_in_way(wayid)
+    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 y2lat(a)
-  180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
-end
+  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
+  end
+
+  def sql_get_way_version(wayid)
+    ActiveRecord::Base.connection.select_one("SELECT version FROM current_ways WHERE id=#{wayid.to_i}")["version"]
+  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
 end