app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   session :off
   5   before_filter :check_write_availability
   6
   7   # AMF controller for Potlatch
   8   # ---------------------------
   9   # All interaction between Potlatch (as a .SWF application) and the
  10   # OSM database takes place using this controller. Messages are
  11   # encoded in the Actionscript Message Format (AMF).
  12   #
  13   # Public domain. Set your tab width to 4 to read this document. :)
  14   # editions Systeme D / Richard Fairhurst 2004-2007
  15
  16   # to trap errors (getway_old,putway,putpoi,deleteway only):
  17   #   return(-1,"message")              <-- just puts up a dialogue
  18   #   return(-2,"message")              <-- also asks the user to e-mail me
  19   # to log:
  20   #   RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
  21
  22   # ====================================================================
  23   # Main AMF handler
  24
  25   # ---- talk   process AMF request
  26
  27   def talk
  28     req=StringIO.new(request.raw_post+0.chr)    # Get POST data as request
  29                                                                                         # (cf http://www.ruby-forum.com/topic/122163)
  30     req.read(2)                                                                 # Skip version indicator and client ID
  31     results={}                                                                  # Results of each body
  32
  33     # -------------
  34     # Parse request
  35
  36     headers=getint(req)                                 # Read number of headers
  37
  38     headers.times do                                # Read each header
  39       name=getstring(req)                               #  |
  40       req.getc                                  #  | skip boolean
  41       value=getvalue(req)                               #  |
  42       header["name"]=value                              #  |
  43     end
  44
  45     bodies=getint(req)                                  # Read number of bodies
  46     bodies.times do                                     # Read each body
  47       message=getstring(req)                    #  | get message name
  48       index=getstring(req)                              #  | get index in response sequence
  49       bytes=getlong(req)                                #  | get total size in bytes
  50       args=getvalue(req)                                #  | get response (probably an array)
  51
  52       case message
  53                   when 'getpresets';            results[index]=putdata(index,getpresets)
  54                   when 'whichways';                     results[index]=putdata(index,whichways(args))
  55                   when 'whichways_deleted';     results[index]=putdata(index,whichways_deleted(args))
  56                   when 'getway';                        results[index]=putdata(index,getway(args))
  57                   when 'getway_old';            results[index]=putdata(index,getway_old(args))
  58                   when 'getway_history';        results[index]=putdata(index,getway_history(args))
  59                   when 'putway';                        results[index]=putdata(index,putway(args))
  60                   when 'deleteway';                     results[index]=putdata(index,deleteway(args))
  61                   when 'putpoi';                        results[index]=putdata(index,putpoi(args))
  62                   when 'getpoi';                        results[index]=putdata(index,getpoi(args))
  63       end
  64     end
  65
  66     # ------------------
  67     # Write out response
  68
  69     RAILS_DEFAULT_LOGGER.info("  Response: start")
  70     a,b=results.length.divmod(256)
  71         render :content_type => "application/x-amf", :text => proc { |response, output|
  72         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  73                 results.each do |k,v|
  74                   output.write(v)
  75                 end
  76         }
  77     RAILS_DEFAULT_LOGGER.info("  Response: end")
  78
  79   end
  80
  81   private
  82
  83   # ====================================================================
  84   # Remote calls
  85
  86   # ----- getpresets
  87   #           return presets,presetmenus and presetnames arrays
  88
  89   def getpresets
  90     presets={}
  91     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
  92     presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
  93     presettype=''
  94     presetcategory=''
  95
  96     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  97
  98     #           File.open("config/potlatch/presets.txt") do |file|
  99
 100     # Temporary patch to get around filepath problem
 101     # To remove this patch and make the code nice again:
 102     # 1. uncomment above line
 103     # 2. fix the path in the above line
 104     # 3. delete this here document, and the following line (StringIO....)
 105
 106     txt=<<-EOF
 107 way/road
 108 motorway: highway=motorway,ref=(type road number)
 109 trunk road: highway=trunk,ref=(type road number),name=(type road name)
 110 primary road: highway=primary,ref=(type road number),name=(type road name)
 111 secondary road: highway=secondary,ref=(type road number),name=(type road name)
 112 tertiary road: highway=tertiary,ref=,name=(type road name)
 113 residential road: highway=residential,ref=,name=(type road name)
 114 unclassified road: highway=unclassified,ref=,name=(type road name)
 115
 116 way/footway
 117 footpath: highway=footway,foot=yes
 118 bridleway: highway=bridleway,foot=yes
 119 byway: highway=unsurfaced,foot=yes
 120 permissive path: highway=footway,foot=permissive
 121
 122 way/cycleway
 123 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 124 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 125 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 126 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 127
 128 way/waterway
 129 canal: waterway=canal,name=(type name here)
 130 navigable river: waterway=river,boat=yes,name=(type name here)
 131 navigable drain: waterway=drain,boat=yes,name=(type name here)
 132 derelict canal: waterway=derelict_canal,name=(type name here)
 133 unnavigable river: waterway=river,boat=no,name=(type name here)
 134 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 135 stream: waterway=stream,boat=no,name=(type name here)
 136
 137 way/railway
 138 railway: railway=rail
 139 tramway: railway=tram
 140 light railway: railway=light_rail
 141 preserved railway: railway=preserved
 142 disused railway tracks: railway=disused
 143 course of old railway: railway=abandoned
 144
 145 way/natural
 146 lake: natural=water,landuse=
 147 forest: landuse=forest,natural=
 148
 149 point/road
 150 mini roundabout: highway=mini_roundabout
 151 traffic lights: highway=traffic_signals
 152
 153 point/footway
 154 bridge: highway=bridge
 155 gate: highway=gate
 156 stile: highway=stile
 157 cattle grid: highway=cattle_grid
 158
 159 point/cycleway
 160 gate: highway=gate
 161
 162 point/waterway
 163 lock gate: waterway=lock_gate
 164 weir: waterway=weir
 165 aqueduct: waterway=aqueduct
 166 winding hole: waterway=turning_point
 167 mooring: waterway=mooring
 168
 169 point/railway
 170 station: railway=station
 171 viaduct: railway=viaduct
 172 level crossing: railway=crossing
 173
 174 point/natural
 175 peak: natural=peak
 176
 177 POI/road
 178 car park: amenity=parking
 179 petrol station: amenity=fuel
 180
 181 POI/cycleway
 182 bike park: amenity=bicycle_parking
 183
 184 POI/place
 185 city: place=city,name=(type name here),is_in=(type region or county)
 186 town: place=town,name=(type name here),is_in=(type region or county)
 187 suburb: place=suburb,name=(type name here),is_in=(type region or county)
 188 village: place=village,name=(type name here),is_in=(type region or county)
 189 hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
 190
 191 POI/tourism
 192 attraction: tourism=attraction,amenity=,religion=,denomination=
 193 church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
 194 hotel: tourism=hotel,amenity=,religion=,denomination=
 195 other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
 196 post box: amenity=post_box,tourism=,name=,religion=,denomination=
 197 post office: amenity=post_office,tourism=,name=,religion=,denomination=
 198 pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
 199
 200 POI/natural
 201 peak: natural=peak
 202 EOF
 203
 204     StringIO.open(txt) do |file|
 205       file.each_line {|line|
 206         t=line.chomp
 207         if (t=~/(\w+)\/(\w+)/) then
 208           presettype=$1
 209           presetcategory=$2
 210           presetmenus[presettype].push(presetcategory)
 211           presetnames[presettype][presetcategory]=["(no preset)"]
 212         elsif (t=~/^(.+):\s?(.+)$/) then
 213           pre=$1; kv=$2
 214           presetnames[presettype][presetcategory].push(pre)
 215           presets[pre]={}
 216           kv.split(',').each {|a|
 217             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 218           }
 219         end
 220       }
 221     end
 222     [presets,presetmenus,presetnames]
 223   end
 224
 225   # ----- whichways(left,bottom,right,top)
 226   #               return array of ways in current bounding box
 227   #               at present, instead of using correct (=more complex) SQL to find
 228   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 229
 230   def whichways(args)
 231     xmin = args[0].to_f-0.01
 232     ymin = args[1].to_f-0.01
 233     xmax = args[2].to_f+0.01
 234     ymax = args[3].to_f+0.01
 235     baselong    = args[4]
 236     basey       = args[5]
 237     masterscale = args[6]
 238
 239     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 240
 241     waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
 242        "  FROM current_way_nodes,current_nodes,current_ways "+
 243        " WHERE current_nodes.id=current_way_nodes.node_id "+
 244        "   AND current_nodes.visible=1 "+
 245        "   AND current_ways.id=current_way_nodes.id "+
 246        "   AND current_ways.visible=1 "+
 247        "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
 248
 249     ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs
 250
 251     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 "+
 252        "  FROM current_nodes "+
 253        "  LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+
 254        " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
 255        "   AND cwn.id IS NULL "+
 256        "   AND current_nodes.visible=1")
 257
 258     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
 259
 260     [ways,points]
 261   end
 262
 263   # ----- whichways_deleted(left,bottom,right,top)
 264   #               return array of deleted ways in current bounding box
 265
 266   def whichways_deleted(args)
 267     xmin = args[0].to_f-0.01
 268     ymin = args[1].to_f-0.01
 269     xmax = args[2].to_f+0.01
 270     ymax = args[3].to_f+0.01
 271     baselong    = args[4]
 272     basey       = args[5]
 273     masterscale = args[6]
 274
 275         sql=<<-EOF
 276                  SELECT DISTINCT current_ways.id
 277                    FROM current_nodes,way_nodes,current_ways
 278                   WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
 279                         AND way_nodes.node_id=current_nodes.id
 280                         AND way_nodes.id=current_ways.id
 281                         AND current_nodes.visible=0
 282                         AND current_ways.visible=0
 283         EOF
 284     waylist = ActiveRecord::Base.connection.select_all(sql)
 285     ways = waylist.collect {|a| a['id'].to_i }
 286         [ways]
 287   end
 288
 289   # ----- getway (objectname, way, baselong, basey, masterscale)
 290   #               returns objectname, array of co-ordinates, attributes,
 291   #                               xmin,xmax,ymin,ymax
 292
 293   def getway(args)
 294     objname,wayid,baselong,basey,masterscale=args
 295     wayid = wayid.to_i
 296     points = []
 297     xmin = ymin =  999999
 298     xmax = ymax = -999999
 299
 300     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 301
 302     readwayquery(wayid).each {|row|
 303       points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])]
 304       xmin = [xmin,row['longitude'].to_f].min
 305       xmax = [xmax,row['longitude'].to_f].max
 306       ymin = [ymin,row['latitude'].to_f].min
 307       ymax = [ymax,row['latitude'].to_f].max
 308     }
 309
 310     attributes={}
 311     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 312     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 313
 314     [objname,points,attributes,xmin,xmax,ymin,ymax]
 315   end
 316
 317   # -----       getway_old (objectname, way, version, baselong, basey, masterscale)
 318   #                     returns old version of way
 319
 320   def getway_old(args)
 321     RAILS_DEFAULT_LOGGER.info("  Message: getway_old (server is #{SERVER_URL})")
 322         if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
 323
 324     objname,wayid,version,baselong,basey,masterscale=args
 325     wayid = wayid.to_i
 326     version = version.to_i
 327     xmin = ymin =  999999
 328     xmax = ymax = -999999
 329         points=[]
 330         if version<0
 331           historic=false
 332           version=getlastversion(wayid,version)
 333         else
 334           historic=true
 335         end
 336         readwayquery_old(wayid,version,historic).each { |row|
 337       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)]
 338       xmin=[xmin,row['longitude'].to_f].min
 339       xmax=[xmax,row['longitude'].to_f].max
 340       ymin=[ymin,row['latitude' ].to_f].min
 341       ymax=[ymax,row['latitude' ].to_f].max
 342         }
 343
 344         # get tags from this version
 345     attributes={}
 346     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}"
 347     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 348         attributes['history']="Retrieved from v"+version.to_s
 349
 350     [0,objname,points,attributes,xmin,xmax,ymin,ymax,version]
 351   end
 352
 353   # -----       getway_history (way)
 354   #                     returns array of previous versions (version,timestamp,visible,user)
 355   #                     should also show 'created_by'
 356
 357   def getway_history(wayid)
 358         history=[]
 359         sql=<<-EOF
 360         SELECT version,timestamp,visible,display_name,data_public
 361           FROM ways,users
 362          WHERE ways.id=#{wayid}
 363            AND ways.user_id=users.id
 364          ORDER BY version DESC
 365         EOF
 366         histlist=ActiveRecord::Base.connection.select_all(sql)
 367         histlist.each { |row|
 368                 if row['data_public'] then user=row['display_name'] else user='anonymous' end
 369                 history<<[row['version'],row['timestamp'],row['visible'],user]
 370         }
 371         [history]
 372   end
 373
 374   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 375   #                                     baselong, basey, masterscale)
 376   #                     returns current way ID, new way ID, hash of renumbered nodes,
 377   #                                     xmin,xmax,ymin,ymax
 378
 379   def putway(args)
 380     RAILS_DEFAULT_LOGGER.info("  putway started")
 381     usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
 382     uid=getuserid(usertoken)
 383     if !uid then return -1,"You are not logged in, so the way could not be saved." end
 384
 385     RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")
 386     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
 387     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
 388     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 389     originalway=originalway.to_i
 390         oldversion=oldversion.to_i
 391
 392     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 393
 394         # -- Temporary check for null IDs
 395
 396         points.each do |a|
 397           if a[2]==0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
 398         end
 399
 400     # -- 3.     read original way into memory
 401
 402     xc={}; yc={}; tagc={}; vc={}
 403     if originalway>0
 404       way=originalway
 405           if oldversion==0
 406             readwayquery(way).each { |row|
 407                   id=row['id'].to_i
 408                   xc[id]=row['longitude'].to_f
 409                   yc[id]=row['latitude' ].to_f
 410                   tagc[id]=row['tags']
 411                   vc[id]=1
 412                 }
 413           else
 414             readwayquery_old(way,oldversion,true).each { |row|
 415                   id=row['id'].to_i
 416                   if (id>0) then
 417                         xc[id]=row['longitude'].to_f
 418                         yc[id]=row['latitude' ].to_f
 419                         tagc[id]=row['tags']
 420                         vc[id]=row['visible'].to_i
 421                   end
 422                 }
 423           end
 424       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 425     else
 426       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 427     end
 428
 429     # -- 4.     get version by inserting new row into ways
 430
 431     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 432
 433     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 434
 435     xmin=ymin= 999999
 436     xmax=ymax=-999999
 437     insertsql=''
 438     renumberednodes={}
 439         nodelist=[]
 440
 441     points.each_index do |i|
 442       xs=coord2long(points[i][0],masterscale,baselong)
 443       ys=coord2lat(points[i][1],masterscale,basey)
 444       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 445       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 446       node=points[i][2].to_i
 447           tagstr=array2tag(points[i][4])
 448       tagsql="'"+sqlescape(tagstr)+"'"
 449       lat=(ys * 10000000).round
 450       long=(xs * 10000000).round
 451       tile=QuadTile.tile_for_point(ys, xs)
 452
 453       # compare node
 454       if node<0
 455         # new node - create
 456                 if renumberednodes[node.to_s].nil?
 457           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})")
 458                   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})")
 459           points[i][2]=newnode
 460           nodelist.push(newnode)
 461           renumberednodes[node.to_s]=newnode.to_s
 462                 else
 463           points[i][2]=renumberednodes[node.to_s].to_i
 464                 end
 465
 466       elsif xc.has_key?(node)
 467                 nodelist.push(node)
 468         # old node from original way - update
 469         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node] or vc[node]==0)
 470           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 471           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
 472         end
 473       else
 474         # old node, created in another way and now added to this way
 475       end
 476     end
 477
 478
 479         # -- 6a. delete any nodes not in modified way
 480
 481     createuniquenodes(way,db_uqn,nodelist)      # nodes which appear in this way but no other
 482
 483     sql=<<-EOF
 484         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 485         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 486           FROM current_nodes AS cn,#{db_uqn}
 487          WHERE cn.id=node_id
 488     EOF
 489     ActiveRecord::Base.connection.insert(sql)
 490
 491     sql=<<-EOF
 492       UPDATE current_nodes AS cn, #{db_uqn}
 493          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 494        WHERE cn.id=node_id
 495     EOF
 496     ActiveRecord::Base.connection.update(sql)
 497
 498         deleteuniquenoderelations(db_uqn,uid,db_now)
 499     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 500
 501         #       6b. insert new version of route into way_nodes
 502
 503     insertsql =''
 504     currentsql=''
 505     sequence  =1
 506     points.each do |p|
 507       if insertsql !='' then insertsql +=',' end
 508       if currentsql!='' then currentsql+=',' end
 509       insertsql +="(#{way},#{p[2]},#{sequence},#{version})"
 510       currentsql+="(#{way},#{p[2]},#{sequence})"
 511       sequence  +=1
 512     end
 513
 514     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}");
 515     ActiveRecord::Base.connection.insert( "INSERT INTO         way_nodes (id,node_id,sequence_id,version) VALUES #{insertsql}");
 516     ActiveRecord::Base.connection.insert( "INSERT INTO current_way_nodes (id,node_id,sequence_id        ) VALUES #{currentsql}");
 517
 518     # -- 7. insert new way tags
 519
 520     insertsql =''
 521     currentsql=''
 522     attributes.each do |k,v|
 523       if v=='' or v.nil? then next end
 524       if v[0,6]=='(type ' then next end
 525       if insertsql !='' then insertsql +=',' end
 526       if currentsql!='' then currentsql+=',' end
 527       insertsql +="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"',#{version})"
 528       currentsql+="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"')"
 529     end
 530
 531     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 532     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 533     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 534
 535     [0,originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
 536   end
 537
 538   # -----       putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
 539   #                     returns current id, new id
 540   #                     if new: add new row to current_nodes and nodes
 541   #                     if old: add new row to nodes, update current_nodes
 542
 543   def putpoi(args)
 544     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
 545     uid=getuserid(usertoken)
 546     if !uid then return -1,"You are not logged in, so the point could not be saved." end
 547
 548     db_now='@now'+(rand*100).to_i.to_s+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 549     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 550
 551     id=id.to_i
 552     visible=visible.to_i
 553         if visible==0 then
 554                 # if deleting, check node hasn't become part of a way
 555                 inway=ActiveRecord::Base.connection.select_one("SELECT cw.id FROM current_ways cw,current_way_nodes cwn WHERE cw.id=cwn.id AND cw.visible=1 AND cwn.node_id=#{id} LIMIT 1")
 556                 unless inway.nil? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
 557                 deleteitemrelations(id,'node',uid,db_now)
 558         end
 559
 560     x=coord2long(x.to_f,masterscale,baselong)
 561     y=coord2lat(y.to_f,masterscale,basey)
 562     tagsql="'"+sqlescape(array2tag(tags))+"'"
 563     lat=(y * 10000000).round
 564     long=(x * 10000000).round
 565     tile=QuadTile.tile_for_point(y, x)
 566
 567     if (id>0) then
 568         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})");
 569         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}");
 570         newid=id
 571     else
 572         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})");
 573               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})");
 574     end
 575     [0,id,newid]
 576   end
 577
 578   # -----       getpoi (id,baselong,basey,masterscale)
 579   #                     returns id,x,y,tag array
 580
 581   def getpoi(args)
 582         id,baselong,basey,masterscale=args; id=id.to_i
 583         poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
 584                 "FROM current_nodes WHERE visible=1 AND id=#{id}")
 585         if poi.nil? then return [nil,nil,nil,''] end
 586         [id,
 587          long2coord(poi['lng'].to_f,baselong,masterscale),
 588          lat2coord(poi['lat'].to_f,basey,masterscale),
 589          tag2array(poi['tags'])]
 590   end
 591
 592   # -----       deleteway (user token, way, nodes to keep)
 593   #                     returns way ID only
 594
 595   def deleteway(args)
 596     usertoken,way=args
 597
 598     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 599     uid=getuserid(usertoken)
 600     if !uid then return -1,"You are not logged in, so the way could not be deleted." end
 601
 602     way=way.to_i
 603     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
 604     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
 605     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 606
 607     # - delete any otherwise unused nodes
 608
 609     createuniquenodes(way,db_uqn,[])
 610
 611 #       unless (preserve.empty?) then
 612 #               ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
 613 #       end
 614
 615     sql=<<-EOF
 616         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 617         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 618           FROM current_nodes AS cn,#{db_uqn}
 619          WHERE cn.id=node_id
 620     EOF
 621     ActiveRecord::Base.connection.insert(sql)
 622
 623     sql=<<-EOF
 624       UPDATE current_nodes AS cn, #{db_uqn}
 625          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 626        WHERE cn.id=node_id
 627     EOF
 628     ActiveRecord::Base.connection.update(sql)
 629
 630         deleteuniquenoderelations(db_uqn,uid,db_now)
 631     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 632
 633     # - delete way
 634
 635     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 636     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 637     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
 638     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 639         deleteitemrelations(way,'way',uid,db_now)
 640     [0,way]
 641 end
 642
 643
 644
 645 # ====================================================================
 646 # Support functions for remote calls
 647
 648 def readwayquery(id)
 649   ActiveRecord::Base.connection.select_all "SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags "+
 650       "    FROM current_way_nodes,current_nodes "+
 651       "   WHERE current_way_nodes.id=#{id} "+
 652       "     AND current_way_nodes.node_id=current_nodes.id "+
 653       "     AND current_nodes.visible=1 "+
 654       "   ORDER BY sequence_id"
 655 end
 656
 657 def getlastversion(id,version)
 658   row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE id=#{id} AND visible=1 ORDER BY version DESC LIMIT 1")
 659   row['version']
 660 end
 661
 662 def readwayquery_old(id,version,historic)
 663   # Node handling on undelete (historic=false):
 664   # - always use the node specified, even if it's moved
 665
 666   # Node handling on revert (historic=true):
 667   # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
 668   #   which means the SWF needs to allocate new ids
 669   # - if it's an invisible node, we can reuse the old node id
 670
 671   # get node list from specified version of way,
 672   # and the _current_ lat/long/tags of each node
 673
 674   row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}")
 675   waytime=row['timestamp']
 676
 677   sql=<<-EOF
 678         SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 679           FROM way_nodes wn,current_nodes cn
 680          WHERE wn.version=#{version}
 681            AND wn.id=#{id}
 682            AND wn.node_id=cn.id
 683          ORDER BY sequence_id
 684   EOF
 685   rows=ActiveRecord::Base.connection.select_all(sql)
 686
 687   # if historic (full revert), get the old version of each node,
 688   # and use this (though with a new id) if it differs from the current one
 689   if historic then
 690         rows.each_index do |i|
 691           sql=<<-EOF
 692           SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 693             FROM nodes
 694            WHERE id=#{rows[i]['id']}
 695              AND timestamp<="#{waytime}"
 696            ORDER BY timestamp DESC
 697            LIMIT 1
 698           EOF
 699           row=ActiveRecord::Base.connection.select_one(sql)
 700           unless row.nil? then
 701             nx=row['longitude'].to_f
 702             ny=row['latitude'].to_f
 703             if (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags']) then
 704                   rows[i]['id']=-1
 705                   # This generates a new node id if x/y/tags differ from current node.
 706                   # Strictly speaking, it need only do this for uniquenodes, but we're
 707                   # not generating uniquenodes for historic ways (yet!).
 708             end
 709                 rows[i]['longitude']=nx
 710                 rows[i]['latitude' ]=ny
 711                 rows[i]['tags'     ]=row['tags']
 712           end
 713     end
 714   end
 715   rows
 716 end
 717
 718 def createuniquenodes(way,uqn_name,nodelist)
 719         # Find nodes which appear in this way but no others
 720         sql=<<-EOF
 721         CREATE TEMPORARY TABLE #{uqn_name}
 722                                         SELECT a.node_id
 723                                           FROM (SELECT DISTINCT node_id FROM current_way_nodes
 724                                                         WHERE id=#{way}) a
 725                                  LEFT JOIN current_way_nodes b
 726                                                 ON b.node_id=a.node_id
 727                                            AND b.id!=#{way}
 728                                          WHERE b.node_id IS NULL
 729         EOF
 730         unless nodelist.empty? then
 731           sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
 732         end
 733         ActiveRecord::Base.connection.execute(sql)
 734 end
 735
 736
 737
 738 # ====================================================================
 739 # Relations handling
 740 # deleteuniquenoderelations(uqn_name,uid,db_now)
 741 # deleteitemrelations(way|node,'way'|'node',uid,db_now)
 742
 743 def deleteuniquenoderelations(uqn_name,uid,db_now)
 744         sql=<<-EOF
 745         SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr
 746          WHERE crm.member_id=node_id
 747            AND crm.member_type='node'
 748            AND crm.id=cr.id
 749            AND cr.visible=1
 750         EOF
 751
 752         relnodes=ActiveRecord::Base.connection.select_all(sql)
 753         relnodes.each do |a|
 754                 removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
 755         end
 756 end
 757
 758 def deleteitemrelations(objid,type,uid,db_now)
 759         sql=<<-EOF
 760         SELECT cr.id FROM current_relation_members crm,current_relations cr
 761          WHERE crm.member_id=#{objid}
 762            AND crm.member_type='#{type}'
 763            AND crm.id=cr.id
 764            AND cr.visible=1
 765         EOF
 766
 767         relways=ActiveRecord::Base.connection.select_all(sql)
 768         relways.each do |a|
 769                 removefromrelation(objid,type,a['id'],uid,db_now)
 770         end
 771 end
 772
 773 def removefromrelation(objid,type,relation,uid,db_now)
 774         rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
 775
 776         tagsql=<<-EOF
 777         INSERT INTO relation_tags (id,k,v,version)
 778         SELECT id,k,v,#{rver} FROM current_relation_tags
 779          WHERE id=#{relation}
 780         EOF
 781         ActiveRecord::Base.connection.insert(tagsql)
 782
 783         membersql=<<-EOF
 784         INSERT INTO relation_members (id,member_type,member_id,member_role,version)
 785         SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members
 786          WHERE id=#{relation}
 787            AND (member_id!=#{objid} OR member_type!='#{type}')
 788         EOF
 789         ActiveRecord::Base.connection.insert(membersql)
 790
 791         ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
 792         ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
 793 end
 794
 795
 796 def sqlescape(a)
 797   a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr}
 798 end
 799
 800 def tag2array(a)
 801   tags={}
 802   Tags.split(a) do |k, v|
 803     tags[k.gsub(':','|')]=v
 804   end
 805   tags
 806 end
 807
 808 def array2tag(a)
 809   tags = []
 810   a.each do |k,v|
 811     if v=='' then next end
 812     if v[0,6]=='(type ' then next end
 813     tags << [k.gsub('|',':'), v]
 814   end
 815   return Tags.join(tags)
 816 end
 817
 818 def getuserid(token)
 819   if (token =~ /^(.+)\+(.+)$/) then
 820     user = User.authenticate(:username => $1, :password => $2)
 821   else
 822     user = User.authenticate(:token => token)
 823   end
 824
 825   return user ? user.id : nil;
 826 end
 827
 828
 829
 830 # ====================================================================
 831 # AMF read subroutines
 832
 833 # ----- getint          return two-byte integer
 834 # ----- getlong         return four-byte long
 835 # ----- getstring       return string with two-byte length
 836 # ----- getdouble       return eight-byte double-precision float
 837 # ----- getobject       return object/hash
 838 # ----- getarray        return numeric array
 839
 840 def getint(s)
 841   s.getc*256+s.getc
 842 end
 843
 844 def getlong(s)
 845   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 846 end
 847
 848 def getstring(s)
 849   len=s.getc*256+s.getc
 850   s.read(len)
 851 end
 852
 853 def getdouble(s)
 854   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 855   a[0]
 856 end
 857
 858 def getarray(s)
 859   len=getlong(s)
 860   arr=[]
 861   for i in (0..len-1)
 862     arr[i]=getvalue(s)
 863   end
 864   arr
 865 end
 866
 867 def getobject(s)
 868   arr={}
 869   while (key=getstring(s))
 870     if (key=='') then break end
 871     arr[key]=getvalue(s)
 872   end
 873   s.getc                # skip the 9 'end of object' value
 874   arr
 875 end
 876
 877 # ----- getvalue        parse and get value
 878
 879 def getvalue(s)
 880   case s.getc
 881         when 0; return getdouble(s)                     # number
 882         when 1; return s.getc                           # boolean
 883         when 2; return getstring(s)                     # string
 884         when 3; return getobject(s)                     # object/hash
 885         when 5; return nil                                      # null
 886         when 6; return nil                                      # undefined
 887         when 8; s.read(4)                                       # mixedArray
 888                         return getobject(s)                     #  |
 889         when 10;return getarray(s)                      # array
 890         else;   return nil                                      # error
 891   end
 892 end
 893
 894 # ====================================================================
 895 # AMF write subroutines
 896
 897 # ----- putdata         envelope data into AMF writeable form
 898 # ----- encodevalue     pack variables as AMF
 899
 900 def putdata(index,n)
 901   d =encodestring(index+"/onResult")
 902   d+=encodestring("null")
 903   d+=[-1].pack("N")
 904   d+=encodevalue(n)
 905 end
 906
 907 def encodevalue(n)
 908   case n.class.to_s
 909   when 'Array'
 910     a=10.chr+encodelong(n.length)
 911     n.each do |b|
 912       a+=encodevalue(b)
 913     end
 914     a
 915   when 'Hash'
 916     a=3.chr
 917     n.each do |k,v|
 918       a+=encodestring(k)+encodevalue(v)
 919     end
 920     a+0.chr+0.chr+9.chr
 921   when 'String'
 922     2.chr+encodestring(n)
 923   when 'Bignum','Fixnum','Float'
 924     0.chr+encodedouble(n)
 925   when 'NilClass'
 926     5.chr
 927   else
 928     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 929   end
 930 end
 931
 932 # ----- encodestring    encode string with two-byte length
 933 # ----- encodedouble    encode number as eight-byte double precision float
 934 # ----- encodelong              encode number as four-byte long
 935
 936 def encodestring(n)
 937   a,b=n.size.divmod(256)
 938   a.chr+b.chr+n
 939 end
 940
 941 def encodedouble(n)
 942   [n].pack('G')
 943 end
 944
 945 def encodelong(n)
 946   [n].pack('N')
 947 end
 948
 949 # ====================================================================
 950 # Co-ordinate conversion
 951
 952 def lat2coord(a,basey,masterscale)
 953   -(lat2y(a)-basey)*masterscale+250
 954 end
 955
 956 def long2coord(a,baselong,masterscale)
 957   (a-baselong)*masterscale+350
 958 end
 959
 960 def lat2y(a)
 961   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 962 end
 963
 964 def coord2lat(a,masterscale,basey)
 965   y2lat((a-250)/-masterscale+basey)
 966 end
 967
 968 def coord2long(a,masterscale,baselong)
 969   (a-350)/masterscale+baselong
 970 end
 971
 972 def y2lat(a)
 973   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 974 end
 975
 976 end