X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/551f96197c11a11cb2882afd551719b8e443b671..3e355d7dc0fff308170bb7c47dea7e8aa8e54acd:/app/controllers/amf_controller.rb diff --git a/app/controllers/amf_controller.rb b/app/controllers/amf_controller.rb index a864d3dcf..c8377991a 100644 --- a/app/controllers/amf_controller.rb +++ b/app/controllers/amf_controller.rb @@ -1,614 +1,964 @@ class AmfController < ApplicationController require 'stringio' -# to log: -# RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}") + session :off + before_filter :check_write_availability + + # AMF controller for 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). + # + # Public domain. Set your tab width to 4 to read this document. :) + # editions Systeme D / Richard Fairhurst 2004-2008 + + # 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]}") # ==================================================================== # Main AMF handler - + # ---- talk process AMF request 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 - - # ------------- - # 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 # | - end + 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 + + # ------------- + # Parse request + + headers=getint(req) # Read number of headers + + headers.times do # Read each header + name=getstring(req) # | + req.getc # | skip boolean + value=getvalue(req) # | + header["name"]=value # | + end + + bodies=getint(req) # Read number of bodies + bodies.times do # Read each body + message=getstring(req) # | get message name + index=getstring(req) # | get index in response sequence + bytes=getlong(req) # | get total size in bytes + args=getvalue(req) # | get response (probably an array) + + case message + when 'getpresets'; results[index]=putdata(index,getpresets) + when 'whichways'; results[index]=putdata(index,whichways(args)) + when 'whichways_deleted'; results[index]=putdata(index,whichways_deleted(args)) + when 'getway'; results[index]=putdata(index,getway(args)) + when 'getway_old'; results[index]=putdata(index,getway_old(args)) + when 'getway_history'; results[index]=putdata(index,getway_history(args)) + when 'putway'; r=putway(args,renumberednodes) + renumberednodes=r[3] + results[index]=putdata(index,r) + when 'deleteway'; results[index]=putdata(index,deleteway(args)) + when 'putpoi'; results[index]=putdata(index,putpoi(args)) + when 'getpoi'; results[index]=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") - 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 + + private + + + # ==================================================================== + # Remote calls + + # ----- getpresets + # in: none + # does: reads tag preset menus, colours, and autocomplete config files + # out: [0] presets, [1] presetmenus, [2] presetnames, + # [3] colours, [4] casing, [5] areas, [6] autotags (all hashes) + + def getpresets + RAILS_DEFAULT_LOGGER.info(" Message: getpresets") + + # Read preset menus + presets={} + presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[] + presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={} + presettype='' + presetcategory='' +# StringIO.open(txt) do |file| + File.open("#{RAILS_ROOT}/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 + + # Read colours/styling + colours={}; casing={}; areas={} + File.open("#{RAILS_ROOT}/config/potlatch/colours.txt") do |file| + file.each_line {|line| + t=line.chomp + if (t=~/(\w+)\s+([^\s]+)\s+([^\s]+)\s+([^\s]+)/) then + tag=$1 + if ($2!='-') then colours[tag]=$2.hex end + if ($3!='-') then casing[tag]=$3.hex end + if ($4!='-') then areas[tag]=$4.hex end end + } + end + + # Read auto-complete + autotags={}; autotags['point']={}; autotags['way']={}; autotags['POI']={}; + File.open("#{RAILS_ROOT}/config/potlatch/autocomplete.txt") do |file| + file.each_line {|line| + t=line.chomp + if (t=~/^(\w+)\/(\w+)\s+(.+)$/) then + tag=$1; type=$2; values=$3 + if values=='-' then autotags[type][tag]=[] + else autotags[type][tag]=values.split(',').sort.reverse end + end + } end + + [presets,presetmenus,presetnames,colours,casing,areas,autotags] + end - # ------------------ - # Write out response + # ----- whichways + # return array of ways in current bounding box + + # in: [0] xmin, [1] ymin, [2] xmax, [3] ymax (bbox in degrees) + # [4] baselong (longitude of SWF map origin), + # [5] basey (projected latitude of SWF map origin), + # [6] masterscale (SWF map scale) + # does: finds all ways and POI nodes in bounding box + # at present, instead of using correct (=more complex) SQL to find + # corner-crossing ways, it simply enlarges the bounding box + # out: [0] array of way ids, + # [1] array of POIs + # (where each POI is an array containing: + # [0] id, [1] projected long, [2] projected lat, [3] hash of tags) + + def whichways(args) + xmin = args[0].to_f-0.01 + ymin = args[1].to_f-0.01 + xmax = args[2].to_f+0.01 + ymax = args[3].to_f+0.01 + baselong = args[4] + basey = args[5] + masterscale = args[6] + + RAILS_DEFAULT_LOGGER.info(" Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}") + + waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+ + " FROM current_way_nodes,current_nodes,current_ways "+ + " WHERE current_nodes.id=current_way_nodes.node_id "+ + " AND current_nodes.visible=1 "+ + " AND current_ways.id=current_way_nodes.id "+ + " AND current_ways.visible=1 "+ + " AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")) + + ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs + + pointlist = ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lng,current_nodes.tags "+ + " FROM current_nodes "+ + " LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+ + " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+ + " AND cwn.id IS NULL "+ + " AND current_nodes.visible=1") + + points = pointlist.collect {|a| [a['id'],long2coord(a['lng'].to_f,baselong,masterscale),lat2coord(a['lat'].to_f,basey,masterscale),tag2array(a['tags'])] } # get a list of node ids and their tags + + [ways,points] + end - 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 - end - render :text=>ans + # ----- 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) + 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] + + sql=<<-EOF + SELECT DISTINCT current_ways.id + FROM current_nodes,way_nodes,current_ways + WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")} + AND way_nodes.node_id=current_nodes.id + AND way_nodes.id=current_ways.id + AND current_nodes.visible=0 + AND current_ways.visible=0 + EOF + waylist = ActiveRecord::Base.connection.select_all(sql) + ways = waylist.collect {|a| a['id'].to_i } + [ways] + end + + # ----- getway + # in: [0] SWF object name, [1] way id, [2] baselong, [3] basey, + # [4] masterscale + # does: gets way and all nodes + # out: [0] SWF object name (unchanged), + # [1] array of points + # (where each point is an array containing + # [0] projected long, [1] projected lat, [2] node id, + # [3] null, [4] hash of node tags), + # [2] xmin, [3] xmax, [4] ymin, [5] ymax (unprojected bbox) + + def getway(args) + objname,wayid,baselong,basey,masterscale=args + wayid = wayid.to_i + points = [] + xmin = ymin = 999999 + xmax = ymax = -999999 + + RAILS_DEFAULT_LOGGER.info(" Message: getway, id=#{wayid}") + + readwayquery(wayid,true).each {|row| + points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])] + xmin = [xmin,row['longitude'].to_f].min + xmax = [xmax,row['longitude'].to_f].max + ymin = [ymin,row['latitude'].to_f].min + ymax = [ymax,row['latitude'].to_f].max + } + + attributes={} + attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}" + attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] } + + [objname,points,attributes,xmin,xmax,ymin,ymax] + end + + # ----- getway_old + # returns old version of way + + # in: [0] SWF object name, [1] way id, + # [2] way version to get (or -1 for "last deleted version") + # [3] baselong, [4] basey, [5] 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) + 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 + + objname,wayid,version,baselong,basey,masterscale=args + wayid = wayid.to_i + version = version.to_i + xmin = ymin = 999999 + xmax = ymax = -999999 + points=[] + if version<0 + historic=false + version=getlastversion(wayid,version) + else + historic=true + end + readwayquery_old(wayid,version,historic).each { |row| + points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,row['visible'].to_i,tag2array(row['tags'].to_s)] + xmin=[xmin,row['longitude'].to_f].min + xmax=[xmax,row['longitude'].to_f].max + ymin=[ymin,row['latitude' ].to_f].min + ymax=[ymax,row['latitude' ].to_f].max + } + + # get tags from this version + attributes={} + attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}" + attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] } + attributes['history']="Retrieved from v"+version.to_s + + [0,objname,points,attributes,xmin,xmax,ymin,ymax,version] end + # ----- getway_history + # find history of a way + + # in: [0] way id + # does: finds history of a way + # out: [0] array of previous versions (where each is + # [0] version, [1] db timestamp, [2] visible 0 or 1, + # [3] username or 'anonymous') + + def getway_history(wayid) + history=[] + sql=<<-EOF + SELECT version,timestamp,visible,display_name,data_public + FROM ways,users + WHERE ways.id=#{wayid} + AND ways.user_id=users.id + AND ways.visible=1 + ORDER BY version DESC + EOF + histlist=ActiveRecord::Base.connection.select_all(sql) + histlist.each { |row| + if row['data_public'].to_i==1 then user=row['display_name'] else user='anonymous' end + history<<[row['version'],row['timestamp'],row['visible'],user] + } + [history] + end - # ==================================================================== - # Remote calls - - # ----- getpresets - # return presets,presetmenus and presetnames arrays - - 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 - } + # ----- putway + # saves a way to the database + + # in: [0] user token, [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) + 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 + + RAILS_DEFAULT_LOGGER.info(" putway authenticated happily") + db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquenodes table name, typically 51 chars + db_now='@now'+(rand*100).to_i.to_s+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars + ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()") + originalway=originalway.to_i + oldversion=oldversion.to_i + + RAILS_DEFAULT_LOGGER.info(" Message: putway, id=#{originalway}") + + # -- Temporary check for null IDs + + 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 + end + + # -- 3. read original way into memory + + xc={}; yc={}; tagc={}; vc={} + if originalway>0 + way=originalway + if oldversion==0 then r=readwayquery(way,false) + else r=readwayquery_old(way,oldversion,true) end + r.each { |row| + id=row['id'].to_i + if (id>0) then + xc[id]=row['longitude'].to_f + yc[id]=row['latitude' ].to_f + tagc[id]=row['tags'] + vc[id]=row['visible'].to_i + end + } + ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}") + else + way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)") + end + + # -- 4. get version by inserting new row into ways + + version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)") + + # -- 5. compare nodes and update xmin,xmax,ymin,ymax + + xmin=ymin= 999999 + xmax=ymax=-999999 + insertsql='' + nodelist=[] + + points.each_index do |i| + xs=coord2long(points[i][0],masterscale,baselong) + ys=coord2lat(points[i][1],masterscale,basey) + xmin=[xs,xmin].min; xmax=[xs,xmax].max + ymin=[ys,ymin].min; ymax=[ys,ymax].max + node=points[i][2].to_i + tagstr=array2tag(points[i][4]) + tagsql="'"+sqlescape(tagstr)+"'" + lat=(ys * 10000000).round + long=(xs * 10000000).round + tile=QuadTile.tile_for_point(ys, xs) + + # compare node + if node<0 + # new node - create + if renumberednodes[node.to_s].nil? + newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes ( latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES ( #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})") + ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})") + points[i][2]=newnode + nodelist.push(newnode) + renumberednodes[node.to_s]=newnode.to_s + else + points[i][2]=renumberednodes[node.to_s].to_i end - [presets,presetmenus,presetnames] - end - # ----- whichways(left,bottom,right,top) - # return array of ways in current bounding box - # at present, instead of using correct (=more complex) SQL to find - # corner-crossing ways, it simply enlarges the bounding box by +/- 0.01 - - def whichways(args) - waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+ - " FROM current_way_segments,current_segments,current_nodes "+ - " WHERE segment_id=current_segments.id "+ - " AND current_segments.visible=1 "+ - " AND node_a=current_nodes.id "+ - " AND (latitude BETWEEN "+(args[1].to_f-0.01).to_s+" AND "+(args[3].to_f+0.01).to_s+") "+ - " AND (longitude BETWEEN "+(args[0].to_f-0.01).to_s+" AND "+(args[2].to_f+0.01).to_s+")") - ways=[] - waylist.each {|a| - ways<0) then + ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})"); + ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}"); + newid=id + else + newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})"); + ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})"); + end + [0,id,newid] + end - attributes={} - attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}" - attrlist.each {|a| attributes[a['k']]=a['v'] } + # ----- 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) + id,baselong,basey,masterscale=args; id=id.to_i + poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+ + "FROM current_nodes WHERE visible=1 AND id=#{id}") + if poi.nil? then return [nil,nil,nil,''] end + [id, + long2coord(poi['lng'].to_f,baselong,masterscale), + lat2coord(poi['lat'].to_f,basey,masterscale), + tag2array(poi['tags'])] + end - [objname,points,attributes,xmin,xmax,ymin,ymax] - end - - # ----- putway (user token, way, array of co-ordinates, array of attributes, - # baselong, basey, masterscale) - # returns current way ID, new way ID, hash of renumbered nodes, - # xmin,xmax,ymin,ymax - - def putway(args) - usertoken,originalway,points,attributes,baselong,basey,masterscale=args - uid=getuserid(usertoken); if !uid then return end - db_uqs='uniq'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquesegments table name, typically 51 chars - db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars - ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()") - originalway=originalway.to_i - - # -- 3. read original way into memory - - xc={}; yc={}; tagc={}; seg={} - if (originalway>0) - way=originalway - readwayquery(way).each { |row| - id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1'] - id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2'] - seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s - } - else - way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)") - end + # ----- deleteway + # delete way and constituent nodes from database + + # in: [0] user token, [1] way id + # does: deletes way from db and any constituent nodes not used elsewhere + # also removes ways/nodes from any relations they're in + # out: [0] 0 (success), [1] way id (unchanged) - # -- 4. get version by inserting new row into ways + def deleteway(args) + usertoken,way=args - version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)") + RAILS_DEFAULT_LOGGER.info(" Message: deleteway, id=#{way}") + uid=getuserid(usertoken) + if !uid then return -1,"You are not logged in, so the way could not be deleted." end - # -- 5. compare nodes and update xmin,xmax,ymin,ymax + way=way.to_i + db_uqn='unin'+(rand*100).to_i.to_s+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquenodes table name, typically 51 chars + db_now='@now'+(rand*100).to_i.to_s+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars + ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()") - xmin=999999; xmax=-999999 - ymin=999999; ymax=-999999 - insertsql='' - nodelist='' - renumberednodes={} - - 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)+"'" - - # compare node - if node<0 - # new node - create - newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes ( latitude,longitude,timestamp,user_id,visible,tags) VALUES ( #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") - ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") - points[i][2]=newnode - renumberednodes[node.to_s]=newnode.to_s - - elsif xc.has_key?(node) - # old node from original way - update - if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node]) - ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})") - ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{ys},longitude=#{xs},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1 WHERE id=#{node}") - else - if (nodelist!='') then nodelist+=',' end; nodelist+=node.to_s - end - else - # old node, created in another way and now added to this way - if (nodelist!='') then nodelist+=',' end; nodelist+=node.to_s - end - - end + # - delete any otherwise unused nodes + + createuniquenodes(way,db_uqn,[]) + +# unless (preserve.empty?) then +# ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")") +# end + + sql=<<-EOF + INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile) + SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile + FROM current_nodes AS cn,#{db_uqn} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.insert(sql) + + sql=<<-EOF + UPDATE current_nodes AS cn, #{db_uqn} + SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} + WHERE cn.id=node_id + EOF + ActiveRecord::Base.connection.update(sql) + + deleteuniquenoderelations(db_uqn,uid,db_now) + ActiveRecord::Base.connection.execute("DROP TEMPORARY TABLE #{db_uqn}") + + # - delete way + + ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)") + ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}") + ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}") + ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}") + deleteitemrelations(way,'way',uid,db_now) + [0,way] +end - if nodelist!='' then - ActiveRecord::Base.connection.update("UPDATE current_nodes SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id IN (#{nodelist})") - end - # -- 6.i compare segments - - numberedsegments={} - seglist='' - for i in (0..(points.length-2)) - if (points[i+1][3].to_i==0) then next end - segid=points[i+1][5].to_i - from =points[i ][2].to_i - to =points[i+1][2].to_i - if seg.has_key?(segid) - if seg[segid]=="#{from}-#{to}" then - if (seglist!='') then seglist+=',' end; seglist+=segid.to_s - next - end - end - segid=ActiveRecord::Base.connection.insert("INSERT INTO current_segments ( node_a,node_b,timestamp,user_id,visible,tags) VALUES ( #{from},#{to},#{db_now},#{uid},1,'')") - ActiveRecord::Base.connection.insert("INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible,tags) VALUES (#{segid},#{from},#{to},#{db_now},#{uid},1,'')") - points[i+1][5]=segid - numberedsegments[(i+1).to_s]=segid.to_s - end - # numberedsegments.each{|a,b| RAILS_DEFAULT_LOGGER.error("Sending back: seg no. #{a} -> id #{b}") } - if seglist!='' then - ActiveRecord::Base.connection.update("UPDATE current_segments SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id IN (#{seglist})") - end +# ==================================================================== +# Support functions for remote calls +def readwayquery(id,insistonvisible) + sql=<<-EOF + SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags,visible + FROM current_way_nodes,current_nodes + WHERE current_way_nodes.id=#{id} + AND current_way_nodes.node_id=current_nodes.id + EOF + if insistonvisible then sql+=" AND current_nodes.visible=1 " end + sql+=" ORDER BY sequence_id" + ActiveRecord::Base.connection.select_all(sql) +end - # -- 6.ii insert new way segments +def getlastversion(id,version) + row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE id=#{id} AND visible=1 ORDER BY version DESC LIMIT 1") + row['version'] +end - createuniquesegments(way,db_uqs) +def readwayquery_old(id,version,historic) + # Node handling on undelete (historic=false): + # - always use the node specified, even if it's moved + + # Node handling on revert (historic=true): + # - if it's a visible node, use a new node id (i.e. not mucking up the old one) + # which means the SWF needs to allocate new ids + # - if it's an invisible node, we can reuse the old node id + + # get node list from specified version of way, + # and the _current_ lat/long/tags of each node + + row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}") + waytime=row['timestamp'] + + sql=<<-EOF + SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags + FROM way_nodes wn,current_nodes cn + WHERE wn.version=#{version} + AND wn.id=#{id} + AND wn.node_id=cn.id + ORDER BY sequence_id + EOF + rows=ActiveRecord::Base.connection.select_all(sql) + + # if historic (full revert), get the old version of each node + # - if it's in another way now, generate a new id + # - if it's not in another way, use the old ID + if historic then + rows.each_index do |i| + sql=<<-EOF + SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags,cwn.id AS currentway + FROM nodes n + LEFT JOIN current_way_nodes cwn + ON cwn.node_id=n.id + WHERE n.id=#{rows[i]['id']} + AND n.timestamp<="#{waytime}" + AND cwn.id!=#{id} + ORDER BY n.timestamp DESC + LIMIT 1 + EOF + row=ActiveRecord::Base.connection.select_one(sql) + unless row.nil? then + nx=row['longitude'].to_f + ny=row['latitude'].to_f + if (row['currentway'] && (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags'])) then rows[i]['id']=-1 end + rows[i]['longitude']=nx + rows[i]['latitude' ]=ny + rows[i]['tags' ]=row['tags'] + end + end + end + rows +end - # a='' - # ActiveRecord::Base.connection.select_values("SELECT segment_id FROM #{db_uqs}").each {|b| a+=b+',' } - # RAILS_DEFAULT_LOGGER.error("Unique segments are #{a}") - # a=ActiveRecord::Base.connection.select_value("SELECT #{db_now}") - # RAILS_DEFAULT_LOGGER.error("Timestamp of this edit is #{a}") - # RAILS_DEFAULT_LOGGER.error("Userid of this edit is #{uid}") +def createuniquenodes(way,uqn_name,nodelist) + # Find nodes which appear in this way but no others + sql=<<-EOF + CREATE TEMPORARY TABLE #{uqn_name} + SELECT a.node_id + FROM (SELECT DISTINCT node_id FROM current_way_nodes + WHERE id=#{way}) a + LEFT JOIN current_way_nodes b + ON b.node_id=a.node_id + AND b.id!=#{way} + WHERE b.node_id IS NULL + EOF + unless nodelist.empty? then + sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")" + end + ActiveRecord::Base.connection.execute(sql) +end - # delete nodes from uniquesegments (and not in modified way) - - sql=<<-EOF - INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible) - SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0 - FROM current_nodes AS cn, - current_segments AS cs, - #{db_uqs} AS us - WHERE(cn.id=cs.node_a OR cn.id=cs.node_b) - AND cs.id=us.segment_id AND cs.visible=1 - AND (cn.timestamp!=#{db_now} OR cn.user_id!=#{uid}) - EOF - ActiveRecord::Base.connection.insert(sql) - - sql=<<-EOF - UPDATE current_nodes AS cn, - current_segments AS cs, - #{db_uqs} AS us - SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} - WHERE (cn.id=cs.node_a OR cn.id=cs.node_b) - AND cs.id=us.segment_id AND cs.visible=1 - AND (cn.timestamp!=#{db_now} OR cn.user_id!=#{uid}) - EOF - ActiveRecord::Base.connection.update(sql) - - # delete segments from uniquesegments (and not in modified way) - - sql=<<-EOF - INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible) - SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0 - FROM current_segments AS cs, #{db_uqs} AS us - WHERE cs.id=us.segment_id AND cs.visible=1 - AND (cs.timestamp!=#{db_now} OR cs.user_id!=#{uid}) - EOF - ActiveRecord::Base.connection.insert(sql) - - sql=<<-EOF - UPDATE current_segments AS cs, #{db_uqs} AS us - SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid} - WHERE cs.id=us.segment_id AND cs.visible=1 - AND (cs.timestamp!=#{db_now} OR cs.user_id!=#{uid}) - EOF - ActiveRecord::Base.connection.update(sql) - ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}") - - # insert new version of route into way_segments - - insertsql ='' - currentsql='' - sequence =1 - for i in (0..(points.length-2)) - if (points[i+1][3].to_i==0) then next end - if insertsql !='' then insertsql +=',' end - if currentsql!='' then currentsql+=',' end - insertsql +="(#{way},#{points[i+1][5]},#{version})" - currentsql+="(#{way},#{points[i+1][5]},#{sequence})" - sequence +=1 - end - - ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}"); - ActiveRecord::Base.connection.insert("INSERT INTO way_segments (id,segment_id,version ) VALUES #{insertsql}"); - ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}"); - - # -- 7. insert new way tags - - insertsql ='' - currentsql='' - attributes.each do |k,v| - if v=='' then next end - if v[0,6]=='(type ' then next end - if insertsql !='' then insertsql +=',' end - if currentsql!='' then currentsql+=',' end - insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',version)" - currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')" - end - - ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}") - if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end - if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end - - [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax] - end - - # ----- deleteway (user token, way) - # returns way ID only - - def deleteway(args) - usertoken,way=args - uid=getuserid(usertoken); if !uid then return end - way=way.to_i - - db_uqs='uniq'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquesegments table name, typically 51 chars - db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars - ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()") - createuniquesegments(way,db_uqs) - - sql=<<-EOF - INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible) - SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0 - FROM current_nodes AS cn, - current_segments AS cs, - #{db_uqs} AS us - WHERE (cn.id=cs.node_a OR cn.id=cs.node_b) - AND cs.id=us.segment_id - EOF - ActiveRecord::Base.connection.insert(sql) - - sql=<<-EOF - UPDATE current_nodes AS cn, - current_segments AS cs, - #{db_uqs} AS us - SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid} - WHERE (cn.id=cs.node_a OR cn.id=cs.node_b) - AND cs.id=us.segment_id - EOF - ActiveRecord::Base.connection.update(sql) - - # - delete any otherwise unused segments - - sql=<<-EOF - INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible) - SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0 - FROM current_segments AS cs, #{db_uqs} AS us - WHERE cs.id=us.segment_id - EOF - ActiveRecord::Base.connection.insert(sql) - - sql=<<-EOF - UPDATE current_segments AS cs, #{db_uqs} AS us - SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid} - WHERE cs.id=us.segment_id - EOF - ActiveRecord::Base.connection.update(sql) - ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}") - - # - delete way - - ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)") - ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}") - ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}") - ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}") - - way - end - - # ==================================================================== - # Support functions for remote calls - - def readwayquery(id) - ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+ - " n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+ - " FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+ - " WHERE current_way_segments.id=#{id} "+ - " AND segment_id=current_segments.id "+ - " AND n1.id=node_a and n2.id=node_b "+ - " ORDER BY sequence_id" - end - def createuniquesegments(way,uqs_name) - sql=<<-EOF - CREATE TEMPORARY TABLE #{uqs_name} - SELECT a.segment_id,COUNT(a.segment_id) AS ct - FROM current_way_segments AS a, current_way_segments AS b - WHERE a.segment_id=b.segment_id - AND a.id=#{way} - GROUP BY a.segment_id - HAVING ct=1 - EOF - ActiveRecord::Base.connection.execute(sql) - end - - def sqlescape(a) - a.gsub("'","''").gsub(92.chr,92.chr+92.chr) - end +# ==================================================================== +# Relations handling +# deleteuniquenoderelations(uqn_name,uid,db_now) +# deleteitemrelations(way|node,'way'|'node',uid,db_now) - def tag2array(a) - tags={} - a.gsub(';;;','#%').split(';').each do |b| - b.gsub!('#%',';;;') - b.gsub!('===','#%') - k,v=b.split('=') - tags[k.gsub('#%','=')]=v.gsub('#%','=') - end - tags - end +def deleteuniquenoderelations(uqn_name,uid,db_now) + sql=<<-EOF + SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr + WHERE crm.member_id=node_id + AND crm.member_type='node' + AND crm.id=cr.id + AND cr.visible=1 + EOF - def array2tag(a) - str='' - a.each do |k,v| - if v=='' then next end - if v[0,6]=='(type ' then next end - if str!='' then str+=';' end - str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===') - end - str + relnodes=ActiveRecord::Base.connection.select_all(sql) + relnodes.each do |a| + removefromrelation(a['node_id'],'node',a['id'],uid,db_now) end +end + +def deleteitemrelations(objid,type,uid,db_now) + sql=<<-EOF + SELECT cr.id FROM current_relation_members crm,current_relations cr + WHERE crm.member_id=#{objid} + AND crm.member_type='#{type}' + AND crm.id=cr.id + AND cr.visible=1 + EOF - def getuserid(token) - token=sqlescape(token) - if (token=~/^(.+)\+(.+)$/) then - return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND timeout>NOW() AND email='#{$1}' AND pass_crypt=MD5('#{$2}')") - else - return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND timeout>NOW() AND token='#{token}'") - end + 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) + 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 - # ==================================================================== - # 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 - end - - def getlong(s) - ((s.getc*256+s.getc)*256+s.getc)*256+s.getc - end - - def getstring(s) - len=s.getc*256+s.getc - s.read(len) - end - - def getdouble(s) - a=s.read(8).unpack('G') # G big-endian, E little-endian - a[0] - end - - def getarray(s) - len=getlong(s) - arr=[] - for i in (0..len-1) - arr[i]=getvalue(s) - end - arr - end - - def getobject(s) - arr={} - while (key=getstring(s)) - if (key=='') then break end - arr[key]=getvalue(s) - end - s.getc # skip the 9 'end of object' value - arr - end - - # ----- 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 - end - end - # ==================================================================== - # AMF write subroutines - - # ----- putdata envelope data into AMF writeable form - # ----- encodevalue pack variables as AMF - - def putdata(index,n) - d =encodestring(index+"/onResult") - d+=encodestring("null") - d+=[-1].pack("N") - d+=encodevalue(n) - end - - 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 - else - RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s) - 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 - end - - def encodedouble(n) - [n].pack('G') - end - - def encodelong(n) - [n].pack('N') - end - - # ==================================================================== - # Co-ordinate conversion - - def lat2coord(a,basey,masterscale) - -(lat2y(a)-basey)*masterscale+250 - end - - def long2coord(a,baselong,masterscale) - (a-baselong)*masterscale+350 - end - - def lat2y(a) - 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2)) - end - - def coord2lat(a,masterscale,basey) - y2lat((a-250)/-masterscale+basey) - end - - def coord2long(a,masterscale,baselong) - (a-350)/masterscale+baselong - end - - def y2lat(a) - 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2) - end +def sqlescape(a) + a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr} +end + +def tag2array(a) + tags={} + Tags.split(a) do |k, v| + tags[k.gsub(':','|')]=v + end + tags +end + +def array2tag(a) + 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) + if (token =~ /^(.+)\+(.+)$/) then + user = User.authenticate(:username => $1, :password => $2) + else + user = User.authenticate(:token => token) + end + return user ? user.id : nil; +end + + + +# ==================================================================== +# 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 +end + +def getlong(s) + ((s.getc*256+s.getc)*256+s.getc)*256+s.getc +end + +def getstring(s) + len=s.getc*256+s.getc + s.read(len) +end + +def getdouble(s) + a=s.read(8).unpack('G') # G big-endian, E little-endian + a[0] +end + +def getarray(s) + len=getlong(s) + arr=[] + for i in (0..len-1) + arr[i]=getvalue(s) + end + arr +end + +def getobject(s) + arr={} + while (key=getstring(s)) + if (key=='') then break end + arr[key]=getvalue(s) + end + s.getc # skip the 9 'end of object' value + arr +end + +# ----- 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 + end +end + +# ==================================================================== +# AMF write subroutines + +# ----- putdata envelope data into AMF writeable form +# ----- encodevalue pack variables as AMF + +def putdata(index,n) + d =encodestring(index+"/onResult") + d+=encodestring("null") + d+=[-1].pack("N") + d+=encodevalue(n) +end + +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 + else + RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s) + 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 +end + +def encodedouble(n) + [n].pack('G') +end + +def encodelong(n) + [n].pack('N') +end + +# ==================================================================== +# Co-ordinate conversion + +def lat2coord(a,basey,masterscale) + -(lat2y(a)-basey)*masterscale+250 +end + +def long2coord(a,baselong,masterscale) + (a-baselong)*masterscale+350 +end + +def lat2y(a) + 180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2)) +end + +def coord2lat(a,masterscale,basey) + y2lat((a-250)/-masterscale+basey) +end + +def coord2long(a,masterscale,baselong) + (a-350)/masterscale+baselong +end + +def y2lat(a) + 180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2) +end end