Changeset tag unit tests

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

diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb
index f4f762a39ebd4d1a43aaeaa5336b197570088204..6e1b364d4794dbfef7ebeca2166e354078f1c604 100644 (file)
--- a/app/controllers/amf_controller.rb
+++ b/app/controllers/amf_controller.rb
@@ -1,257 +1,782 @@
+# 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.
+#
+# 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
+# 
+# To write to the Rails log, use RAILS_DEFAULT_LOGGER.info("message").
+

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

-  # Still to do:
-  # - all db interaction
-  # - user authentication
-  # - (also pass lat/lon through from view tab to edit tab)
+  include Potlatch

 
 

-  # ====================================================================
-  # Main AMF handler
-  
-  # ---- talk  process AMF request
+  # Help methods for checking boundary sanity and area size
+  include MapBoundary

 
 

-  def talk
-       req=StringIO.new(request.raw_post)      # Get POST data as request
-       req.read(2)                                                     # Skip version indicator and client ID
-       results={}                                                      # Results of each body
+  session :off
+  before_filter :check_write_availability
+
+  # 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
 
        # Parse request
 

-       headers=getint(req)                                     # Read number of headers
-       for i in (1..headers)                           # Read each header
-               name=getstring(req)                             #  |
-               req.getc                                                #  | skip boolean
-               value=getvalue(req)                             #  |
-               header["name"]=value                    #  |
+       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
 
        end
 

-       bodies=getint(req)                                      # Read number of bodies
-       for i in (1..bodies)                            # 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)
-       
-               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))
-               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
        end

+    logger.info("encoding AMF results")
+    sendresponse(results)
+  end

 
 

-       # ------------------
-       # Write out response
+  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

 
 

-       response.headers["Content-Type"]="application/x-amf"
-       a,b=results.length.divmod(256)
-       ans=0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
-       results.each do |k,v|
-               ans+=v
+       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
        end

-       render :text=>ans

 
 

+       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)

   end
 
   end
 

+  private

 
 

-       # ====================================================================
-       # Remote calls
-
-       def getpresets
-               presets={}
-               presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
-               presetnames={}; presetnames['point']={}; presetnames['way']={}
-               presettype=''
-               presetcategory=''
-               
-               File.open("config/potlatch/presets.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
-                                       }
-                               end
-                       }
-               end
-               [presets,presetmenus,presetnames]
-       end
+  # Start new changeset
+  
+  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

 
 

-       def whichways(args)
-               # to do
+       # close previous changeset and add comment
+       if closeid
+         cs = Changeset.find(closeid)
+         cs.open = false
+         if closecomment.empty?
+               cs.save!
+         else
+           cs.tags['comment']=closecomment
+           cs.save_with_tags!
+         end

        end
        
        end
        

-       def getway(args)
-               # to do
+       # 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]
+  end
+
+  # Return presets (default tags, localisation etc.):
+  # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
+
+  def getpresets() #:doc:
+       return POTLATCH_PRESETS
+  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. 
+
+  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([])
+
+         # 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] }
+
+         # 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
        end

-       
-       def putway(args)
-               # to do
+
+       [0,ways, points, relations]
+  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
+
+    # 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
+
+       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
+
+       [0,way_ids]
+  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.
+
+  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,[],{}]
+      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
        end

-       
-       def deleteway(args)
-               # to do
+
+       [wayid, points, tags, version]
+  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, 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
        end

-       
-       # need support functions here too:
-       #       database support functions (readwayquery, createuniquesegments)
-       #       tag2array, array2tag
-       #       getuserid

 
 

-       # ====================================================================
-       # AMF read subroutines
-       
-       # ----- 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
-       
-       def getint(s)
-               s.getc*256+s.getc
+    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)]
+    end
+  end
+  
+  # Find history of a way. Returns 'way', id, and 
+  # an array of previous versions.
+
+  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]
+    rescue ActiveRecord::RecordNotFound
+      return ['way', wayid, []]
+    end
+  end
+
+  # Find history of a node. Returns 'node', id, and 
+  # an array of previous versions.
+
+  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]
+    rescue ActiveRecord::RecordNotFound
+      return ['node', nodeid, []]
+    end
+  end
+
+  # 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
        end

-       
-       def getlong(s)
-               ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
+       gpxs
+  end
+
+  # Get a relation with all tags and members.
+  # Returns:
+  # 0. relation id,
+  # 1. hash of tags,
+  # 2. list of members,
+  # 3. version.
+  
+  def getrelation(relid) #:doc:
+    begin
+         rel = Relation.find(relid)
+    rescue ActiveRecord::RecordNotFound
+      return [relid, {}, []]
+    end
+
+    return [relid, {}, [], nil] if rel.nil? or !rel.visible
+       [relid, rel.tags, rel.members, rel.version]
+  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
        end

-       
-       def getstring(s)
-               len=s.getc*256+s.getc
-               s.read(len)
+       rels
+  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
        end

-       
-       def getdouble(s)
-               a=s.read(8).unpack('G')                 # G big-endian, E little-endian
-               a[0]
+
+       # 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
        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]
+  end
+
+  # Save a way to the database, including all nodes. Any nodes in the previous
+  # version and no longer used are deleted.
+  # 
+  # 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

        
        

-       def getarray(s)
-               len=getlong(s)
-               arr=[]
-               for i in (0..len-1)
-                       arr[i]=getvalue(s)
-               end
-               arr
+       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
        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
+
+       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
        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
+
+       # -- 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

+         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
 
        end
 

-       # ====================================================================
-       # AMF write subroutines
-       
-       # ----- putdata         envelope data into AMF writeable form
-       # ----- encodevalue     pack variables as AMF
+       # -- Delete any unique nodes

        
        

-       def putdata(index,n)
-               d =encodestring(index+"/onResult")
-               d+=encodestring("null")
-               d+=[-1].pack("N")
-               d+=encodevalue(n)
+       uniques.each do |n|
+         deleteitemrelations(n, 'node')
+
+         node = Node.find(n)
+         node.changeset_id = changeset
+         node.visible = false
+         node.save_with_history!

        end
        end

-       
-       def encodevalue(n)
-               case n.class.to_s
-                       when 'Array'
-                               a=10.chr+encodelong(n.length)
-                               n.each do |b|
-                                       a+=encodevalue(b)
-                               end
-                               a
-                       when 'Hash'
-                               a=3.chr
-                               n.each do |k,v|
-                                       a+=encodestring(k)+encodevalue(v)
-                               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
-               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
        end

-       
-       # ----- encodestring    encode string with two-byte length
-       # ----- encodedouble    encode number as eight-byte double precision float
-       # ----- encodelong              encode number as four-byte long
-       
-       def encodestring(n)
-               a,b=n.size.divmod(256)
-               a.chr+b.chr+n
+
+       [0, originalway, way.id, renumberednodes, way.version]
+  end
+
+  # Save POI to the database.
+  # Refuses save if the node has since become part of a way.
+  # Returns:
+  # 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
        end

-       
-       def encodedouble(n)
-               [n].pack('G')
+
+       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]
+  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
        end

-       
-       def encodelong(n)
-               [n].pack('N')
+
+       if n
+         return [n.id, n.lon, n.lat, n.tags, n.version]
+       else
+         return [nil, nil, nil, {}, nil]

        end
        end

-       
-       # ====================================================================
-       # Co-ordinate conversion
-       
-       def lat2coord(a)
-               -(lat2y(a)-$basey)*$masterscale+250
+  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
        end

-       
-       def long2coord(a)
-               (a-$baselong)*$masterscale+350
+       deleteitemrelations(way_id, 'way')
+
+       way.delete_with_relations_and_nodes_and_history(changeset_id.to_i)
+
+       [0, way_id]
+  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)
+
+  def getuserid(token) #:doc:
+       if (token =~ /^(.+)\:(.+)$/) then
+         user = User.authenticate(:username => $1, :password => $2)
+       else
+         user = User.authenticate(:token => token)

        end
        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)
+  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
+       }
+  end
+
+
+  # ====================================================================
+  # 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] }
+  end

        
        

-       def lat2y(a)
-               180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
+  def sql_find_pois_in_area(xmin,ymin,xmax,ymax)
+       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 
+ 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.")}
+       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
        end

+       pois
+  end

        
        

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

+       return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }
+  end

        
        

-       def coord2long(a)
-               (a-350)/$masterscale+$baselong
+  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} 
+                  AND current_way_nodes.node_id=current_nodes.id 
+                  AND current_nodes.visible=TRUE
+         ORDER BY sequence_id
+         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
        end

+       points
+  end

        
        

-       def y2lat(a)
-               180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
+  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
        end

+       tags
+  end

 
 

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

 end
 end

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