Added methods to strip those non-XML control characters from tags in AMF controller...

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

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index 1fa433c9e198d49f8e6c9e623530af55bde24396..20053644d8635177a32ffd3c175328bb496ee29c 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -3,7 +3,7 @@
 # OSM database takes place using this controller. Messages are 
 # encoded in the Actionscript Message Format (AMF).
 #
 # OSM database takes place using this controller. Messages are 
 # 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.


@@ -24,10 +24,16 @@
 # == Debugging
 # 
 # Any method that returns a status code (0 for ok) can also send:
 # == 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(-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 RAILS_DEFAULT_LOGGER.info("message").
+# To write to the Rails log, use logger.info("message").
+
+# Remaining issues:
+# * version conflict when POIs and ways are reverted

 
 class AmfController < ApplicationController
   require 'stringio'
 
 class AmfController < ApplicationController
   require 'stringio'


@@ -37,218 +43,305 @@ class AmfController < ApplicationController
   # Help methods for checking boundary sanity and area size
   include MapBoundary
 
   # Help methods for checking boundary sanity and area size
   include MapBoundary
 

-  session :off
-  before_filter :check_write_availability
+  before_filter :check_api_writable

 
   # 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
 
   # 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

-       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)
-      logger.info "Executing AMF #{message}:#{index}"
-
-         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 'findgpx';                         results[index]=AMF.putdata(index,findgpx(*args))
-               when 'findrelations';           results[index]=AMF.putdata(index,findrelations(*args))
-               when 'getpoi';                          results[index]=AMF.putdata(index,getpoi(*args))
-         end
-       end
-    logger.info("encoding AMF results")
-    sendresponse(results)
+    if request.post?
+      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)
+        logger.info("Executing AMF #{message}(#{args.join(',')}):#{index}")
+
+        case message
+          when 'getpresets';        results[index]=AMF.putdata(index,getpresets(*args))
+          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]))
+          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 'findgpx';           results[index]=AMF.putdata(index,findgpx(*args))
+          when 'findrelations';     results[index]=AMF.putdata(index,findrelations(*args))
+          when 'getpoi';            results[index]=AMF.putdata(index,getpoi(*args))
+        end
+      end
+      logger.info("Encoding AMF results")
+      sendresponse(results)
+    else
+      render :nothing => true, :status => :method_not_allowed
+    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))
-               when 'putpoi';                          results[index]=AMF.putdata(index,putpoi(*args))
-               when 'startchangeset';          results[index]=AMF.putdata(index,startchangeset(*args))
-         end
-       end
-    sendresponse(results)
+    if request.post?
+      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)
+        err=false                   # Abort batch on error
+
+        logger.info("Executing AMF #{message}:#{index}")
+        if err
+          results[index]=[-5,nil]
+        else
+          case message
+            when 'putway';         orn=renumberednodes.dup
+                                   r=putway(renumberednodes,*args)
+                                   r[4]=renumberednodes.reject { |k,v| orn.has_key?(k) }
+                                   if r[2] != r[3] then renumberedways[r[2]] = r[3] 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))
+            when 'putpoi';         r=putpoi(*args)
+                                   if r[2] != r[3] then renumberednodes[r[2]] = r[3] end
+                                   results[index]=AMF.putdata(index,r)
+            when 'startchangeset'; results[index]=AMF.putdata(index,startchangeset(*args))
+           end
+          if results[index][0]==-3 then err=true end  # If a conflict is detected, don't execute any more writes
+        end
+      end
+      logger.info("Encoding AMF results")
+      sendresponse(results)
+    else
+      render :nothing => true, :status => :method_not_allowed
+    end

   end
 
   private
 
   end
 
   private
 

+  def amf_handle_error(call)
+    yield
+  rescue OSM::APIVersionMismatchError => ex
+    return [-3, [ex.type.downcase, ex.latest, ex.id]]
+  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.to_s}"]
+  rescue OSM::APIError => ex
+    return [-1, ex.to_s]
+  rescue Exception => ex
+    return [-2, "An unusual error happened (in #{call}). The server said: #{ex.to_s}"]
+  end
+
+  def amf_handle_error_with_timeout(call)
+    amf_handle_error(call) do
+      Timeout::timeout(APP_CONFIG['api_timeout'], OSM::APITimeoutError) do
+        yield
+      end
+    end
+  end
+

   # Start new changeset
   # Start new changeset

+  # Returns success_code,success_message,changeset id

   
   

-  def startchangeset(usertoken, cstags, closeid, closecomment)
-       uid = getuserid(usertoken)
-       if !uid then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
-
-       # close previous changeset and add comment
-       if closeid
-       end
+  def startchangeset(usertoken, cstags, closeid, closecomment, opennew)
+    amf_handle_error("'startchangeset'") do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
+
+      # close previous changeset and add comment
+      if closeid
+        cs = Changeset.find(closeid)
+        cs.set_closed_time_now
+        if cs.user_id!=user.id
+          raise OSM::APIUserChangesetMismatchError.new
+        elsif closecomment.empty?
+          cs.save!
+        else
+          cs.tags['comment']=closecomment
+          cs.save_with_tags!
+        end
+      end

        
        

-       # open a new changeset
-       cs = Changeset.new
-       cs.tags = cstags
-       cs.user_id = uid
-       cs.created_at = Time.now
-       cs.save_with_tags!
-       return [0,cs.id]
+      # open a new changeset
+      if opennew!=0
+        cs = Changeset.new
+        cs.tags = cstags
+        cs.user_id = user.id
+        if !closecomment.empty? then cs.tags['comment']=closecomment 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.
 
   end
 
   # Return presets (default tags, localisation etc.):
   # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
 

-  def getpresets() #:doc:
-       return POTLATCH_PRESETS
+  def getpresets(usertoken,lang) #:doc:
+    user = getuser(usertoken)
+
+    if user && !user.languages.empty?
+      request.user_preferred_languages = user.languages
+    end
+
+    lang = request.compatible_language_from(getlocales)
+
+    begin
+      # if not, try the browser language
+      localised = YAML::load(File.open("#{RAILS_ROOT}/config/potlatch/localised/#{lang}/localised.yaml"))
+    rescue
+      # fall back to hardcoded English text
+      localised = ""
+    end
+
+    begin
+      help = File.read("#{RAILS_ROOT}/config/potlatch/localised/#{lang}/help.html")
+    rescue
+      help = File.read("#{RAILS_ROOT}/config/potlatch/localised/en/help.html")
+    end
+    return POTLATCH_PRESETS+[localised,help]

   end
 
   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. 
   # 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) #:doc:
   def whichways(xmin, ymin, xmax, ymax) #:doc:

-       xmin -= 0.01; ymin -= 0.01
-       xmax += 0.01; ymax += 0.01
-    
-    # check boundary is sane and area within defined
-    # see /config/application.yml
-    begin
-      check_boundaries(xmin, ymin, xmax, ymax)
-    rescue Exception => err
-      return [-2,"Sorry - I can't get the map for that area."]
-    end
-
-       if POTLATCH_USE_SQL then
-         ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
-         points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
-         relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
-       else
-         # find the way ids in an area
-         nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
-         ways = nodes_in_area.collect { |node| 
-               node.ways.collect { |w| [w.id,w.version] }.flatten
-         }.uniq
-         ways.delete([])
+    amf_handle_error_with_timeout("'whichways'") do
+      enlarge = [(xmax-xmin)/8,0.01].min
+      xmin -= enlarge; ymin -= enlarge
+      xmax += enlarge; ymax += enlarge

 
 

-         # 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] }
+      # check boundary is sane and area within defined
+      # see /config/application.yml
+      check_boundaries(xmin, ymin, xmax, ymax)

 
 

-         # find the relations used by those nodes and ways
-         relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
-                  Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
-         relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
-       end
+      if POTLATCH_USE_SQL then
+        ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
+        points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
+        relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
+      else
+        # find the way ids in an area
+        nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
+        ways = nodes_in_area.inject([]) { |sum, node| 
+          visible_ways = node.ways.select { |w| w.visible? }
+          sum + visible_ways.collect { |w| [w.id,w.version] }
+        }.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.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
+                    Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
+        relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
+      end

 
 

-       [0,ways, points, relations]
+      [0, '', ways, points, relations]
+    end

   end
 
   # Find deleted ways in current bounding box (similar to whichways, but ways
   # with a deleted node only - not POIs or relations).
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
   end
 
   # Find deleted ways in current bounding box (similar to whichways, but ways
   # with a deleted node only - not POIs or relations).
 
   def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:

-       xmin -= 0.01; ymin -= 0.01
-       xmax += 0.01; ymax += 0.01
+    amf_handle_error_with_timeout("'whichways_deleted'") 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
-    begin
+      # check boundary is sane and area within defined
+      # see /config/application.yml

       check_boundaries(xmin, ymin, xmax, ymax)
       check_boundaries(xmin, ymin, xmax, ymax)

-    rescue Exception => err
-      # FIXME: report an error rather than just return an empty result
-      return [[]]
-    end

 
 

-       nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
-       way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
+      nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
+      way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq

 
 

-       [way_ids]
+      [0,'',way_ids]
+    end

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

-  # Returns the way id, a Potlatch-style array of points, a hash of tags, and the version number.
+  # Returns the way id, a Potlatch-style array of points, a hash of tags, the version number, and the user ID.

 
   def getway(wayid) #:doc:
 
   def getway(wayid) #:doc:

-       if POTLATCH_USE_SQL then
-         points = sql_get_nodes_in_way(wayid)
-         tags = sql_get_tags_in_way(wayid)
-         version = sql_get_way_version(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
-      begin
-           way = Way.find(wayid)
-      rescue ActiveRecord::RecordNotFound
-        return [wayid,[],{}]
+    amf_handle_error_with_timeout("'getway' #{wayid}") do
+      if POTLATCH_USE_SQL then
+        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.find(:first, :conditions => { :id => wayid }, :include => { :nodes => :node_tags })
+
+        # check case where way has been deleted or doesn't exist
+        return [-4, 'way', wayid, [], {}, nil] if way.nil? or !way.visible
+
+        points = way.nodes.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
 
       end
 

-      # check case where way has been deleted or doesn't exist
-      return [wayid,[],{}] if way.nil? or !way.visible
-
-         points = way.nodes.collect do |node|
-               nodetags=node.tags
-               nodetags.delete('created_by')
-               [node.lon, node.lat, node.id, nodetags]
-         end
-         tags = way.tags
-         version = way.version
-       end
-
-       [wayid, points, tags, version]
+      [0, '', wayid, points, tags, version, uid]
+    end

   end
   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, 
   # Get an old version of a way, and all constituent nodes.
   #
   # For undelete (version<0), always uses the most recent version of each node, 


@@ -263,513 +356,638 @@ class AmfController < ApplicationController
   # 3. hash of tags, 
   # 4. version, 
   # 5. is this the current, visible version? (boolean)
   # 3. hash of tags, 
   # 4. version, 
   # 5. is this the current, visible version? (boolean)

+  
+  def getway_old(id, timestamp) #:doc:
+    amf_handle_error_with_timeout("'getway_old' #{id}, #{timestamp}") do
+      if timestamp == ''
+        # undelete
+        old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
+        points = old_way.get_nodes_undelete unless old_way.nil?
+      else
+        begin
+          # revert
+          timestamp = DateTime.strptime(timestamp.to_s, "%d %b %Y, %H:%M:%S")
+          old_way = OldWay.find(:first, :conditions => ['id = ? AND timestamp <= ?', id, timestamp], :order => 'timestamp DESC')
+          unless old_way.nil?
+            points = old_way.get_nodes_revert(timestamp)
+            if !old_way.visible
+              return [-1, "Sorry, the way was deleted at that time - please revert to a previous version.", id, [], {}, nil, false]
+            end
+          end
+        rescue ArgumentError
+          # thrown by date parsing method. leave old_way as nil for
+          # the error handler below.
+        end
+      end

 
 

-  def getway_old(id, version) #:doc:
-       if version < 0
-         old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
-         points = old_way.get_nodes_undelete unless old_way.nil?
-       else
-         old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
-         points = old_way.get_nodes_revert unless old_way.nil?
-       end
-
-    if old_way.nil?
-      return [-1, id, [], {}, -1,0]
-    else
-         curway=Way.find(id)
-         old_way.tags['history'] = "Retrieved from v#{old_way.version}"
-         return [0, id, points, old_way.tags, old_way.version, (curway.version==old_way.version and curway.visible)]
+      if old_way.nil?
+        return [-1, "Sorry, the server could not find a way at that time.", id, [], {}, nil, false]
+      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 and curway.visible)]
+      end

     end
   end
   
     end
   end
   

-  # Find history of a way. Returns 'way', id, and 
-  # an array of previous versions.
+  # 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) #:doc:
     begin
 
   def getway_history(wayid) #:doc:
     begin

-         history = Way.find(wayid).old_ways.reverse.collect do |old_way|
-        user_object = old_way.changeset.user
-           user = user_object.data_public? ? user_object.display_name : 'anonymous'
-           uid  = user_object.data_public? ? user_object.id : 0
-           [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid]
-         end
-
-         return ['way',wayid,history]
+      # Find list of revision dates for way and all constituent nodes
+      revdates=[]
+      revusers={}
+      Way.find(wayid).old_ways.collect do |a|
+        revdates.push(a.timestamp)
+        unless revusers.has_key?(a.timestamp.to_i) then revusers[a.timestamp.to_i]=change_user(a) end
+        a.nds.each do |n|
+          Node.find(n).old_nodes.collect do |o|
+            revdates.push(o.timestamp)
+            unless revusers.has_key?(o.timestamp.to_i) then revusers[o.timestamp.to_i]=change_user(o) end
+          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) or revdates.include?(d+2) }
+      # Collect all in one nested array
+      revdates.collect! {|d| [d.succ.strftime("%d %b %Y, %H:%M:%S")] + revusers[d.to_i] }
+      revdates.uniq!
+
+      return ['way', wayid, revdates]

     rescue ActiveRecord::RecordNotFound
       return ['way', wayid, []]
     end
   end
     rescue ActiveRecord::RecordNotFound
       return ['way', wayid, []]
     end
   end

-
-  # Find history of a node. Returns 'node', id, and 
-  # an array of previous versions.
+  
+  # Find history of a node. Returns 'node', id, and an array of previous versions as above.

 
   def getnode_history(nodeid) #:doc:
 
   def getnode_history(nodeid) #:doc:

-    begin
-         history = Node.find(nodeid).old_nodes.reverse.collect do |old_node|
-        user_object = old_node.changeset.user
-           user = user_object.data_public? ? user_object.display_name : 'anonymous'
-           uid  = user_object.data_public? ? user_object.id : 0
-           [old_node.version, old_node.timestamp.strftime("%d %b %Y, %H:%M"), old_node.visible ? 1 : 0, user, uid]
-         end
-
-         return ['node',nodeid,history]
+    begin 
+      history = Node.find(nodeid).old_nodes.reverse.collect do |old_node|
+        [old_node.timestamp.succ.strftime("%d %b %Y, %H:%M:%S")] + change_user(old_node)
+      end
+      return ['node', nodeid, history]

     rescue ActiveRecord::RecordNotFound
       return ['node', nodeid, []]
     end
   end
 
     rescue ActiveRecord::RecordNotFound
       return ['node', nodeid, []]
     end
   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 findgpx(searchterm, usertoken)
   # Find GPS traces with specified name/id.
   # Returns array listing GPXs, each one comprising id, name and description.
   
   def findgpx(searchterm, usertoken)

-       uid = getuserid(usertoken)
-       if !uid then return -1,"You must be logged in to search for GPX traces." end
-
-       gpxs = []
-       if searchterm.to_i>0 then
-         gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,uid] )
-         if gpx then
-           gpxs.push([gpx.id, gpx.name, gpx.description])
-         end
-       else
-         Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,uid,searchterm] ).each do |gpx|
-               gpxs.push([gpx.id, gpx.name, gpx.description])
-         end
-       end
-       gpxs
+    amf_handle_error_with_timeout("'findgpx'") do
+      user = getuser(usertoken)
+      if !uid then return -1,"You must be logged in to search for GPX traces.",[] end
+
+      gpxs = []
+      if searchterm.to_i>0 then
+        gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,user.id] )
+        if gpx then
+          gpxs.push([gpx.id, gpx.name, gpx.description])
+        end
+      else
+        Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,user.id,searchterm] ).each do |gpx|
+          gpxs.push([gpx.id, gpx.name, gpx.description])
+        end
+      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,
-  # 3. version.
+  # 0. success code?
+  # 1. object type?
+  # 2. relation id,
+  # 3. hash of tags,
+  # 4. list of members,
+  # 5. version.

   
   def getrelation(relid) #:doc:
   
   def getrelation(relid) #:doc:

-    begin
-         rel = Relation.find(relid)
-    rescue ActiveRecord::RecordNotFound
-      return [relid, {}, []]
-    end
+    amf_handle_error("'getrelation' #{relid}") do
+      rel = Relation.find(:first, :conditions => { :id => relid })

 
 

-    return [relid, {}, [], nil] if rel.nil? or !rel.visible
-       [relid, rel.tags, rel.members, rel.version]
+      return [-4, 'relation', relid, {}, [], nil] if rel.nil? or !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.
   
   def findrelations(searchterm)
   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 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>0 then
+      rel = Relation.find(searchterm.to_i)
+      if rel and rel.visible then
+        rels.push([rel.id, rel.tags, rel.members, rel.version])
+      end
+    else
+      RelationTag.find(:all, :limit => 11, :conditions => ["v like ?", "%#{searchterm}%"] ).each do |t|
+        if t.relation.visible then
+          rels.push([t.relation.id, t.relation.tags, t.relation.members, t.relation.version])
+        end
+      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, changeset, 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 != 0)
-
-       # create a new relation, or find the existing one
-       if relid <= 0
-         rel = Relation.new
-         rel.version = 0
-       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.changeset_id = changeset
-
-       # 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) #:doc:
+    amf_handle_error("'putrelation' #{relid}")  do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the relation could not be saved." end
+      if !tags_ok(tags) then return -1,"One of the tags is invalid. Please pester Adobe to fix Flash on Linux." end
+      tags = strip_non_xml_chars tags
+
+      relid = relid.to_i
+      visible = (visible.to_i != 0)
+
+      new_relation = nil
+      relation = nil
+      Relation.transaction do
+        # create a new relation, or find the existing one
+        if relid > 0
+          relation = Relation.find(relid)
+        end
+        # 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
+          if mid
+            typedmembers << [m[0], mid, m[2]]
+          end
+        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 # transaction
+      
+      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),
-  # 4. version
-
-  def putway(renumberednodes, usertoken, changeset, originalway, points, attributes) #:doc:
-
-       # -- Initialise and carry out checks
+  # 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 node versions (node=>version)
+
+  def putway(renumberednodes, usertoken, changeset_id, wayversion, originalway, pointlist, attributes, nodes, deletednodes) #:doc:
+    amf_handle_error("'putway' #{originalway}") do
+      # -- Initialise

        
        

-       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
-         way.version = 0       # otherwise +=1 breaks
-         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
-               node.version = 0        # otherwise +=1 breaks
-               savenode = true
-         else
-               node = Node.find(id)
-               nodetags=node.tags
-               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.changeset_id = changeset
-           node.lat = lat
-        node.lon = lon
-           node.tags = 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
-
-       # -- Delete any unique nodes
-       
-       uniques.each do |n|
-         deleteitemrelations(n, 'node')
-
-         node = Node.find(n)
-         node.changeset_id = changeset
-         node.visible = false
-         node.save_with_history!
-       end
-
-       # -- Save revised way
-
-       if way.tags!=attributes or way.nds!=nodes or !way.visible?
-         way.tags = attributes
-         way.nds = nodes
-         way.changeset_id = changeset
-         way.visible = true
-         way.save_with_history!
-       end
-
-       [0, originalway, way.id, renumberednodes, way.version]
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the way could not be saved." end
+      if pointlist.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
+      if !tags_ok(tags) then return -1,"One of the tags is invalid. Please pester Adobe to fix Flash on Linux." end
+      tags = strip_non_xml_chars tags
+
+      originalway = originalway.to_i
+      pointlist.collect! {|a| a.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
+          if id == 0  then return -2,"Server error - node with id 0 found in way #{originalway}." end
+          if lat== 90 then return -2,"Server error - node with latitude -90 found in way #{originalway}." end
+          if renumberednodes[id] then id = renumberednodes[id] end
+
+          node = Node.new
+          node.changeset_id = changeset_id
+          node.lat = lat
+          node.lon = lon
+          node.tags = a[4]
+          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! {|a|
+          renumberednodes[a] ? renumberednodes[a]:a
+        } # renumber nodes
+        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 or way.nds!=pointlist or !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 => ex
+            # We don't do anything here as the node is being used elsewhere
+            # and we don't want to delete it
+          end
+        end
+
+      end # transaction
+
+      [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,
-  # 3. version.
-
-  def putpoi(usertoken, changeset, 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
-         node.version = 0
-       end
-
-       node.changeset_id = changeset
-       node.lat = lat
-       node.lon = lon
-       node.tags = tags
-       node.visible = visible
-       node.save_with_history!
-
-       [0, id, node.id, node.version]
+  # 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) #:doc:
+    amf_handle_error("'putpoi' #{id}") do
+      user = getuser(usertoken)
+      if !user then return -1,"You are not logged in, so the point could not be saved." end
+      if !tags_ok(tags) then return -1,"One of the tags is invalid. Please pester Adobe to fix Flash on Linux." end
+      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 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.",id,id,version end
+          end
+        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 # transaction
+
+      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, version.
-
-  def getpoi(id,version) #:doc:
-       if version>0 then
-         n = OldNode.find(id, :conditions=>['version=?',version])
-       else
-         n = Node.find(id)
-       end
+  # Returns array of id, long, lat, hash of tags, (current) version.
+
+  def getpoi(id,timestamp) #:doc:
+    amf_handle_error("'getpoi' #{id}") do
+      id = id.to_i
+      n = Node.find(id)
+      v = n.version
+      unless timestamp == ''
+        n = OldNode.find(:first, :conditions => ['id = ? AND timestamp <= ?', id, timestamp], :order => 'timestamp DESC')
+      end

 
 

-       if n
-         return [n.id, n.lon, n.lat, n.tags, n.version]
-       else
-         return [nil, nil, nil, {}, nil]
-       end
+      if n
+        return [0, '', n.id, n.lon, n.lat, n.tags, v]
+      else
+        return [-4, 'node', id, nil, nil, {}, nil]
+      end
+    end

   end
 
   end
 

-  # Delete way and all constituent nodes. Also removes from any relations.
-  # Returns 0 (success), unchanged way id.
-
-  def deleteway(usertoken, changeset_id, way_id) #:doc:
-       if !getuserid(usertoken) then return -1,"You are not logged in, so the way could not be deleted." end
-
-       way_id = way_id.to_i
-
-       # FIXME: would be good not to make two history entries when removing
-       #                two nodes from the same relation
-       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(changeset_id.to_i)
-
-       [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) #:doc:
+    amf_handle_error("'deleteway' #{way_id}") do
+      user = getuser(usertoken)
+      unless user then return -1,"You are not logged in, so the way could not be deleted." end
+      
+      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 => ex
+            # 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 # transaction
+      [0, '', way_id, old_way.version, nodeversions]
+    end

   end
 
 
   # ====================================================================
   # Support functions
 
   end
 
 
   # ====================================================================
   # 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
-  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
-  end
-

   # Authenticate token
   # (can also be of form user:pass)
   # 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 getuserid(token) #:doc:
-       if (token =~ /^(.+)\:(.+)$/) then
-         user = User.authenticate(:username => $1, :password => $2)
-       else
-         user = User.authenticate(:token => token)
-       end
-
-       return user ? user.id : nil;
-  end
-
-  # Compare two floating-point numbers to within 0.0000001
-
-  def fpcomp(a,b) #:doc:
-       return ((a/0.0000001).round==(b/0.0000001).round)
+  def getuser(token) #:doc:
+    if (token =~ /^(.+)\:(.+)$/) then
+      user = User.authenticate(:username => $1, :password => $2)
+    else
+      user = User.authenticate(:token => token)
+    end
+    return user

   end
 
   # Send AMF response
   
   def sendresponse(results)
   end
 
   # Send AMF response
   
   def sendresponse(results)

-       a,b=results.length.divmod(256)
-       render :content_type => "application/x-amf", :text => proc { |response, output| 
-         # ** move amf writing loop into here - 
-         # basically we read the messages in first (into an array of some sort),
-         # then iterate through that array within here, and do all the AMF writing
-         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
-         results.each do |k,v|
-               output.write(v)
-         end
-       }
+    a,b=results.length.divmod(256)
+    render :content_type => "application/x-amf", :text => proc { |response, output| 
+      # ** move amf writing loop into here - 
+      # basically we read the messages in first (into an array of some sort),
+      # then iterate through that array within here, and do all the AMF writing
+      output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
+      results.each do |k,v|
+        output.write(v)
+      end
+    }

   end
 
   end
 

+  def getlocales
+    Dir.glob("#{RAILS_ROOT}/config/potlatch/localised/*").collect { |f| File.basename(f) }
+  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
+    return true
+  end
+
+  ##
+  # strip characters which are invalid in XML documents from the strings
+  # in the +tags+ hash.
+  def strip_non_xml_chars(tags)
+    new_tags = Hash.new
+    unless tags.nil?
+      tags.each do |k, v|
+        new_k = k.delete "\000-\037", "^\011\012\015"
+        new_v = v.delete "\000-\037", "^\011\012\015"
+        new_tags[new_k] = new_v
+      end
+    end
+    return new_tags
+  end

 
   # ====================================================================
   # Alternative SQL queries for getway/whichways
 
   def sql_find_ways_in_area(xmin,ymin,xmax,ymax)
 
   # ====================================================================
   # Alternative SQL queries for getway/whichways
 
   def sql_find_ways_in_area(xmin,ymin,xmax,ymax)

-       sql=<<-EOF
-  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(ymin, xmin, ymax, xmax, "current_nodes.")}
-       EOF
-       return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['wayid'].to_i,a['version'].to_i] }
+    sql=<<-EOF
+    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(ymin, xmin, ymax, xmax, "current_nodes.")}
+    EOF
+    return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['wayid'].to_i,a['version'].to_i] }

   end
        
   def sql_find_pois_in_area(xmin,ymin,xmax,ymax)
   end
        
   def sql_find_pois_in_area(xmin,ymin,xmax,ymax)

-       pois=[]
-       sql=<<-EOF
+    pois=[]
+    sql=<<-EOF

                  SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.version 
                        FROM current_nodes 
                  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 
+       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(ymin, xmin, ymax, xmax, "current_nodes.")}
                   WHERE current_nodes.visible=TRUE
                         AND cwn.id IS NULL
                         AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}

-       EOF
-       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
+    EOF
+    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 sql_find_relations_in_area_and_ways(xmin,ymin,xmax,ymax,way_ids)
   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,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(ymin, xmin, ymax, xmax, "cn.")}
-       EOF
-       unless way_ids.empty?
-         sql+=<<-EOF
-          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(',')})
-         EOF
-       end
-       return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }
+    # ** It would be more Potlatchy to get relations for nodes within ways
+    #    during 'getway', not here
+    sql=<<-EOF
+      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(ymin, xmin, ymax, xmax, "cn.")}
+      EOF
+    unless way_ids.empty?
+      sql+=<<-EOF
+       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(',')})
+        EOF
+    end
+    ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }

   end
        
   def sql_get_nodes_in_way(wayid)
   end
        
   def sql_get_nodes_in_way(wayid)

-       points=[]
-       sql=<<-EOF
-               SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id 
-                 FROM current_way_nodes,current_nodes 
-                WHERE current_way_nodes.id=#{wayid.to_i} 
+    points=[]
+    sql=<<-EOF
+      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
                   AND current_way_nodes.node_id=current_nodes.id 
                   AND current_nodes.visible=TRUE

-         ORDER BY sequence_id
+      ORDER BY sequence_id

          EOF
          EOF

-       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]
-       end
-       points
+    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)
   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
+    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)
   end
 
   def sql_get_way_version(wayid)

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

-# Local Variables:
-# indent-tabs-mode: t
-# tab-width: 4
-# End: