# 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). # # See Also Potlatch::Potlatch and Potlatch::AMF # # Public domain. # editions Systeme D / Richard Fairhurst 2004-2008 # # All in/out parameters are floats unless explicitly stated. # # to trap errors (getway_old,putway,putpoi,deleteway only): # return(-1,"message") <-- just puts up a dialogue # return(-2,"message") <-- also asks the user to e-mail me # to log: # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}") class AmfController < ApplicationController require 'stringio' include Potlatch session :off before_filter :check_write_availability # Main AMF handler. Tha talk method takes in AMF, figures out what to do and dispatched to the appropriate private method def talk req=StringIO.new(request.raw_post+0.chr) # Get POST data as request # (cf http://www.ruby-forum.com/topic/122163) req.read(2) # Skip version indicator and client ID results={} # Results of each body renumberednodes={} # Shared across repeated putways renumberedways={} # Shared across repeated putways # ------------- # Parse request headers=AMF.getint(req) # Read number of headers headers.times do # Read each header name=AMF.getstring(req) # | req.getc # | skip boolean value=AMF.getvalue(req) # | header["name"]=value # | end bodies=AMF.getint(req) # Read number of bodies bodies.times do # Read each body message=AMF.getstring(req) # | get message name index=AMF.getstring(req) # | get index in response sequence bytes=AMF.getlong(req) # | get total size in bytes args=AMF.getvalue(req) # | get response (probably an array) case message when 'getpresets'; results[index]=AMF.putdata(index,getpresets) when 'whichways'; results[index]=AMF.putdata(index,whichways(args)) when 'whichways_deleted'; results[index]=AMF.putdata(index,whichways_deleted(args)) when 'getway'; results[index]=AMF.putdata(index,getway(args)) when 'getrelation'; results[index]=AMF.putdata(index,getrelation(args)) when 'getway_old'; results[index]=AMF.putdata(index,getway_old(args)) when 'getway_history'; results[index]=AMF.putdata(index,getway_history(args)) when 'putway'; r=putway(args,renumberednodes) 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(args, renumberednodes, renumberedways)) when 'deleteway'; results[index]=AMF.putdata(index,deleteway(args)) when 'putpoi'; results[index]=AMF.putdata(index,putpoi(args)) when 'getpoi'; results[index]=AMF.putdata(index,getpoi(args)) end end # ------------------ # Write out response RAILS_DEFAULT_LOGGER.info(" Response: start") a,b=results.length.divmod(256) render :content_type => "application/x-amf", :text => proc { |response, output| output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr results.each do |k,v| output.write(v) end } RAILS_DEFAULT_LOGGER.info(" Response: end") end private # Return presets (default tags and crap) to potlatch. # Uses POTLATCH_PRESETS global, set up in OSM::Potlatch def getpresets #:doc: return POTLATCH_PRESETS end # ----- whichways # Find all the way ids and nodes (including tags and projected lat/lng) which aren't part of those ways in an are # # The argument is an array containing the following, in order: # 0. minimum longitude # 1. minimum latitude # 2. maximum longitude # 3. maximum latitude # 4. baselong, 5. basey, 6. masterscale as above def whichways(args) #:doc: xmin = args[0].to_f-0.01 ymin = args[1].to_f-0.01 xmax = args[2].to_f+0.01 ymax = args[3].to_f+0.01 baselong = args[4] basey = args[5] masterscale = args[6] def whichways(xmin, ymin, xmax, ymax) #:doc: xmin -= 0.01; ymin -= 0.01 xmax += 0.01; ymax += 0.01 if POTLATCH_USE_SQL then way_ids = sql_find_way_ids_in_area(xmin, ymin, xmax, ymax) points = sql_find_pois_in_area(xmin, ymin, xmax, ymax) relation_ids = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, way_ids) else # find the way ids in an area nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 1", :include => :ways) way_ids = nodes_in_area.collect { |node| node.way_ids }.flatten.uniq # 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_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] } # find the relations used by those nodes and ways relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => "visible = 1") + Relation.find_for_ways(way_ids, :conditions => "visible = 1") relation_ids = relations.collect { |relation| relation.id }.uniq end [way_ids, points, relation_ids] end # ----- whichways_deleted # return array of deleted ways in current bounding box # in: as whichways # does: finds all deleted ways with a deleted node in bounding box # out: [0] array of way ids def whichways_deleted(args) #:doc: xmin = args[0].to_f-0.01 ymin = args[1].to_f-0.01 xmax = args[2].to_f+0.01 ymax = args[3].to_f+0.01 baselong = args[4] basey = args[5] masterscale = args[6] def whichways_deleted(xmin, ymin, xmax, ymax) #:doc: xmin -= 0.01; ymin -= 0.01 xmax += 0.01; ymax += 0.01 nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 0 AND current_ways.visible = 0", :include => :ways_via_history) way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq [way_ids] end # ----- getway # Get a way with all of it's nodes and tags # The input is an array with the following components, in order: # 0. wayid - the ID of the way to get # 1. baselong - origin of SWF map (longitude) # 2. basey - origin of SWF map (latitude) # 3. masterscale - SWF map scale # # The output is an array which contains all the nodes (with projected # latitude and longitude) and tags for a way (and all the nodes tags). # It also has the way's unprojected (WGS84) bbox. # # FIXME: The server really shouldn't be figuring out a ways bounding box and doing projection for potlatch # FIXME: the argument splitting should be done in the 'talk' method, not here def getway(args) #:doc: wayid,baselong,basey,masterscale = args wayid = wayid.to_i def getway(wayid) #:doc: if POTLATCH_USE_SQL then points = sql_get_nodes_in_way(wayid) tags = sql_get_tags_in_way(wayid) else # Ideally we would do ":include => :nodes" here but if we do that # then rails only seems to return the first copy of a node when a # way includes a node more than once way = Way.find(wayid) points = way.nodes.collect do |node| [node.lon, node.lat, node.id, nil, node.tags_as_hash] end tags = way.tags end [wayid, points, tags] end # ----- getway_old # returns old version of way # in: [0] way id, # [1] way version to get (or -1 for "last deleted version") # [2] baselong, [3] basey, [4] masterscale # does: gets old version of way and all constituent nodes # for undelete, always uses the most recent version of each node # (even if it's moved) # for revert, uses the historic version of each node, but if that node is # still visible and has been changed since, generates a new node id # out: [0] 0 (code for success), [1] SWF object name, # [2] array of points (as getway _except_ [3] is node.visible?, 0 or 1), # [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox), # [8] way version def getway_old(args) #:doc: RAILS_DEFAULT_LOGGER.info(" Message: getway_old (server is #{SERVER_URL})") # if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end def getway_old(id, version) #:doc: if version < 0 old_way = OldWay.find(:first, :conditions => ['visible = 1 AND id = ?', id], :order => 'version DESC') points = old_way.get_nodes_undelete else old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version]) points = old_way.get_nodes_revert end old_way.tags['history'] = "Retrieved from v#{old_way.version}" [0, id, points, old_way.tags, old_way.version] end def getway_history(wayid) #:doc: history = Way.find(wayid).old_ways.collect do |old_way| user = old_way.user.data_public? ? old_way.user.display_name : 'anonymous' [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user] end [history] end # Get a relation with all tags and members. # Returns: # 0. relation id, # 1. hash of tags, # 2. list of members. def getrelation(relid) #:doc: rel = Relation.find(relid) [relid, rel.tags, rel.members] end # ----- getrelation # save relation to the database # in: [0] user token (string), # [1] original relation id (may be negative), # [2] hash of tags, [3] list of members, # [4] visible # out: [0] 0 (success), [1] original relation id (unchanged), # [2] new relation id def putrelation(args, renumberednodes, renumberedways) #:doc: usertoken,relid,tags,members,visible=args uid=getuserid(usertoken) if !uid then return -1,"You are not logged in, so the point could not be saved." end def putrelation(renumberednodes, renumberedways, usertoken, relid, tags, members, visible) #:doc: uid = getuserid(usertoken) if !uid then return -1,"You are not logged in, so the relation could not be saved." end relid = relid.to_i visible = visible.to_i # create a new relation, or find the existing one if relid <= 0 rel = Relation.new else rel = Relation.find(relid) end # check the members are all positive, and correctly type typedmembers = [] members.each do |m| mid = m[1].to_i if mid < 0 mid = renumberednodes[mid] if m[0] == 'node' mid = renumberedways[mid] if m[0] == 'way' if mid < 0 return -2, "Negative ID unresolved" end end typedmembers << [m[0], mid, m[2]] end # assign new contents rel.members = typedmembers rel.tags = tags rel.visible = visible rel.user_id = uid # check it then save it # BUG: the following is commented out because it always fails on my # install. I think it's a Rails bug. #if !rel.preconditions_ok? # return -2, "Relation preconditions failed" #else rel.save_with_history! #end [0, relid, rel.id] end # ----- putway # saves a way to the database # in: [0] user token (string), # [1] original way id (may be negative), # [2] array of points (as getway/getway_old), # [3] hash of way tags, # [4] original way version (0 if not a reverted/undeleted way), # [5] baselong, [6] basey, [7] masterscale # does: saves way to the database # all constituent nodes are created/updated as necessary # (or deleted if they were in the old version and are otherwise unused) # out: [0] 0 (code for success), [1] original way id (unchanged), # [2] new way id, [3] hash of renumbered nodes (old id=>new id), # [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox) def putway(args,renumberednodes) #:doc: RAILS_DEFAULT_LOGGER.info(" putway started") usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args uid=getuserid(usertoken) if !uid then return -1,"You are not logged in, so the way could not be saved." end def putway(renumberednodes, usertoken, originalway, points, attributes) #:doc: # -- Initialise and carry out checks uid = getuserid(usertoken) if !uid then return -1,"You are not logged in, so the way could not be saved." end originalway = originalway.to_i points.each do |a| if a[2] == 0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end if a[1] == 90 then return -2,"Server error - node with lat -90 found in way #{originalway}." end end if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end # -- 3. read original way into memory if originalway < 0 way = Way.new uniques = [] else way = Way.find(originalway) uniques = way.unshared_node_ids end # -- 4. get version by inserting new row into ways nodes = [] points.each do |n| lon = n[0].to_f lat = n[1].to_f id = n[2].to_i savenode = false if renumberednodes[id] id = renumberednodes[id] elsif id < 0 # Create new node node = Node.new savenode = true else node = Node.find(id) if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or Tags.join(n[4]) != node.tags or !node.visible? savenode = true end end if savenode node.user_id = uid node.lat = lat node.lon = lon node.tags = Tags.join(n[4]) node.visible = true node.save_with_history! if id != node.id renumberednodes[id] = node.id id = node.id end end uniques = uniques - [id] nodes.push(id) end # -- Delete any unique nodes uniques.each do |n| deleteitemrelations(n, 'node') node = Node.find(n) node.user_id = uid node.visible = false node.save_with_history! end points.each_index do |i| xs=coord2long(points[i][0],masterscale,baselong) ys=coord2lat(points[i][1],masterscale,basey) xmin=[xs,xmin].min; xmax=[xs,xmax].max ymin=[ys,ymin].min; ymax=[ys,ymax].max node=points[i][2].to_i tagstr=array2tag(points[i][4]) tagsql="'"+sqlescape(tagstr)+"'" lat=(ys * 10000000).round long=(xs * 10000000).round tile=QuadTile.tile_for_point(ys, xs) way.tags = attributes way.nds = nodes way.user_id = uid way.visible = true way.save_with_history! [0, originalway, way.id, renumberednodes] end # ----- putpoi # save POI to the database # in: [0] user token (string), # [1] original node id (may be negative), # [2] projected longitude, [3] projected latitude, # [4] hash of tags, [5] visible (0 to delete, 1 otherwise), # [6] baselong, [7] basey, [8] masterscale # does: saves POI node to the database # refuses save if the node has since become part of a way # out: [0] 0 (success), [1] original node id (unchanged), # [2] new node id def putpoi(args) #:doc: usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args uid=getuserid(usertoken) if !uid then return -1,"You are not logged in, so the point could not be saved." end def putpoi(usertoken, id, lon, lat, tags, visible) #:doc: uid = getuserid(usertoken) if !uid then return -1,"You are not logged in, so the point could not be saved." end id = id.to_i visible = (visible.to_i == 1) if id > 0 then node = Node.find(id) if !visible then unless node.ways.empty? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end deleteitemrelations(id, 'node') end else node = Node.new end node.user_id = uid node.lat = lat node.lon = lon node.tags = Tags.join(tags) node.visible = visible node.save_with_history! [0, id, node.id] end # ----- getpoi # read POI from database # (only called on revert: POIs are usually read by whichways) # in: [0] node id, [1] baselong, [2] basey, [3] masterscale # does: reads POI # out: [0] id (unchanged), [1] projected long, [2] projected lat, # [3] hash of tags def getpoi(args) #:doc: id,baselong,basey,masterscale = args n = Node.find(id.to_i) if n return [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] else return [nil,nil,nil,''] end end def getpoi(id) #:doc: n = Node.find(id) if n return [n.id, n.lon, n.lat, n.tags_as_hash] else return [nil, nil, nil, ''] end end def deleteway(usertoken, way_id) #:doc: uid = getuserid(usertoken) if !uid then return -1,"You are not logged in, so the way could not be deleted." end # FIXME: would be good not to make two history entries when removing # two nodes from the same relation user = User.find(uid) way = Way.find(way_id) way.unshared_node_ids.each do |n| deleteitemrelations(n, 'node') end way.delete_with_relations_and_nodes_and_history(user) [0, way_id] end def createuniquenodes(way,uqn_name,nodelist) #:doc: # Find nodes which appear in this way but no others sql=<<-EOF CREATE TEMPORARY TABLE #{uqn_name} SELECT a.node_id FROM (SELECT DISTINCT node_id FROM current_way_nodes WHERE id=#{way}) a LEFT JOIN current_way_nodes b ON b.node_id=a.node_id AND b.id!=#{way} WHERE b.node_id IS NULL EOF unless nodelist.empty? then sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")" end ActiveRecord::Base.connection.execute(sql) end # ==================================================================== # Relations handling # deleteuniquenoderelations(uqn_name,uid,db_now) # deleteitemrelations(way|node,'way'|'node',uid,db_now) def deleteuniquenoderelations(uqn_name,uid,db_now) #:doc: sql=<<-EOF SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr WHERE crm.member_id=node_id AND crm.member_type='node' AND crm.id=cr.id AND cr.visible=1 EOF 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 def deleteitemrelations(objid,type,uid,db_now) #:doc: sql=<<-EOF SELECT cr.id FROM current_relation_members crm,current_relations cr WHERE crm.member_id=#{objid} AND crm.member_type='#{type}' AND crm.id=cr.id AND cr.visible=1 EOF relways=ActiveRecord::Base.connection.select_all(sql) relways.each do |a| removefromrelation(objid,type,a['id'],uid,db_now) end end def removefromrelation(objid,type,relation,uid,db_now) #:doc: rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)") tagsql=<<-EOF INSERT INTO relation_tags (id,k,v,version) SELECT id,k,v,#{rver} FROM current_relation_tags WHERE id=#{relation} EOF ActiveRecord::Base.connection.insert(tagsql) membersql=<<-EOF INSERT INTO relation_members (id,member_type,member_id,member_role,version) SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members WHERE id=#{relation} AND (member_id!=#{objid} OR member_type!='#{type}') EOF ActiveRecord::Base.connection.insert(membersql) ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}") ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}") end def sqlescape(a) #:doc: a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr} end def tag2array(a) #:doc: tags={} Tags.split(a) do |k, v| tags[k.gsub(':','|')]=v end tags end def array2tag(a) #:doc: tags = [] a.each do |k,v| if v=='' then next end if v[0,6]=='(type ' then next end tags << [k.gsub('|',':'), v] end return Tags.join(tags) end 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 # ==================================================================== # Co-ordinate conversion def lat2coord(a,basey,masterscale) #:doc: -(lat2y(a)-basey)*masterscale end def long2coord(a,baselong,masterscale) #:doc: (a-baselong)*masterscale end def lat2y(a) #:doc: 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2)) end def coord2lat(a,masterscale,basey) #:doc: y2lat(a/-masterscale+basey) end def coord2long(a,masterscale,baselong) #:doc: a/masterscale+baselong end def y2lat(a) 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2) end end # Local Variables: # indent-tabs-mode: t # tab-width: 4 # End: