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     renumberednodes={}                                                  # Shared across repeated putways
  33
  34     # -------------
  35     # Parse request
  36
  37     headers=getint(req)                                 # Read number of headers
  38
  39     headers.times do                                # Read each header
  40       name=getstring(req)                               #  |
  41       req.getc                                  #  | skip boolean
  42       value=getvalue(req)                               #  |
  43       header["name"]=value                              #  |
  44     end
  45
  46     bodies=getint(req)                                  # Read number of bodies
  47     bodies.times do                                     # Read each body
  48       message=getstring(req)                    #  | get message name
  49       index=getstring(req)                              #  | get index in response sequence
  50       bytes=getlong(req)                                #  | get total size in bytes
  51       args=getvalue(req)                                #  | get response (probably an array)
  52
  53       case message
  54                   when 'getpresets';            results[index]=putdata(index,getpresets)
  55                   when 'whichways';                     results[index]=putdata(index,whichways(args))
  56                   when 'whichways_deleted';     results[index]=putdata(index,whichways_deleted(args))
  57                   when 'getway';                        results[index]=putdata(index,getway(args))
  58                   when 'getway_old';            results[index]=putdata(index,getway_old(args))
  59                   when 'getway_history';        results[index]=putdata(index,getway_history(args))
  60                   when 'putway';                        r=putway(args,renumberednodes)
  61                                                                         renumberednodes=r[3]
  62                                                                         results[index]=putdata(index,r)
  63                   when 'deleteway';                     results[index]=putdata(index,deleteway(args))
  64                   when 'putpoi';                        results[index]=putdata(index,putpoi(args))
  65                   when 'getpoi';                        results[index]=putdata(index,getpoi(args))
  66       end
  67     end
  68
  69     # ------------------
  70     # Write out response
  71
  72     RAILS_DEFAULT_LOGGER.info("  Response: start")
  73     a,b=results.length.divmod(256)
  74         render :content_type => "application/x-amf", :text => proc { |response, output|
  75         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  76                 results.each do |k,v|
  77                   output.write(v)
  78                 end
  79         }
  80     RAILS_DEFAULT_LOGGER.info("  Response: end")
  81
  82   end
  83
  84   private
  85
  86   # ====================================================================
  87   # Remote calls
  88
  89   # ----- getpresets
  90   #           return presets,presetmenus and presetnames arrays
  91
  92   def getpresets
  93     presets={}
  94     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
  95     presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
  96     presettype=''
  97     presetcategory=''
  98
  99     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
 100
 101     #           File.open("config/potlatch/presets.txt") do |file|
 102
 103     # Temporary patch to get around filepath problem
 104     # To remove this patch and make the code nice again:
 105     # 1. uncomment above line
 106     # 2. fix the path in the above line
 107     # 3. delete this here document, and the following line (StringIO....)
 108
 109     txt=<<-EOF
 110 way/road
 111 motorway: highway=motorway,ref=(type road number)
 112 trunk road: highway=trunk,ref=(type road number),name=(type road name)
 113 primary road: highway=primary,ref=(type road number),name=(type road name)
 114 secondary road: highway=secondary,ref=(type road number),name=(type road name)
 115 tertiary road: highway=tertiary,ref=,name=(type road name)
 116 residential road: highway=residential,ref=,name=(type road name)
 117 unclassified road: highway=unclassified,ref=,name=(type road name)
 118
 119 way/footway
 120 footpath: highway=footway,foot=yes
 121 bridleway: highway=bridleway,foot=yes
 122 byway: highway=unsurfaced,foot=yes
 123 permissive path: highway=footway,foot=permissive
 124
 125 way/cycleway
 126 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 127 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 128 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 129 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 130
 131 way/waterway
 132 canal: waterway=canal,name=(type name here)
 133 navigable river: waterway=river,boat=yes,name=(type name here)
 134 navigable drain: waterway=drain,boat=yes,name=(type name here)
 135 derelict canal: waterway=derelict_canal,name=(type name here)
 136 unnavigable river: waterway=river,boat=no,name=(type name here)
 137 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 138 stream: waterway=stream,boat=no,name=(type name here)
 139
 140 way/railway
 141 railway: railway=rail
 142 tramway: railway=tram
 143 light railway: railway=light_rail
 144 preserved railway: railway=preserved
 145 disused railway tracks: railway=disused
 146 course of old railway: railway=abandoned
 147
 148 way/natural
 149 lake: natural=water,landuse=
 150 forest: landuse=forest,natural=
 151
 152 point/road
 153 mini roundabout: highway=mini_roundabout
 154 traffic lights: highway=traffic_signals
 155
 156 point/footway
 157 bridge: highway=bridge
 158 gate: highway=gate
 159 stile: highway=stile
 160 cattle grid: highway=cattle_grid
 161
 162 point/cycleway
 163 gate: highway=gate
 164
 165 point/waterway
 166 lock gate: waterway=lock_gate
 167 weir: waterway=weir
 168 aqueduct: waterway=aqueduct
 169 winding hole: waterway=turning_point
 170 mooring: waterway=mooring
 171
 172 point/railway
 173 station: railway=station
 174 viaduct: railway=viaduct
 175 level crossing: railway=crossing
 176
 177 point/natural
 178 peak: natural=peak
 179
 180 POI/road
 181 car park: amenity=parking
 182 petrol station: amenity=fuel
 183
 184 POI/cycleway
 185 bike park: amenity=bicycle_parking
 186
 187 POI/place
 188 city: place=city,name=(type name here),is_in=(type region or county)
 189 town: place=town,name=(type name here),is_in=(type region or county)
 190 suburb: place=suburb,name=(type name here),is_in=(type region or county)
 191 village: place=village,name=(type name here),is_in=(type region or county)
 192 hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
 193
 194 POI/tourism
 195 attraction: tourism=attraction,amenity=,religion=,denomination=
 196 church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
 197 hotel: tourism=hotel,amenity=,religion=,denomination=
 198 other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
 199 post box: amenity=post_box,tourism=,name=,religion=,denomination=
 200 post office: amenity=post_office,tourism=,name=,religion=,denomination=
 201 pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
 202
 203 POI/natural
 204 peak: natural=peak
 205 EOF
 206
 207     StringIO.open(txt) do |file|
 208       file.each_line {|line|
 209         t=line.chomp
 210         if (t=~/(\w+)\/(\w+)/) then
 211           presettype=$1
 212           presetcategory=$2
 213           presetmenus[presettype].push(presetcategory)
 214           presetnames[presettype][presetcategory]=["(no preset)"]
 215         elsif (t=~/^(.+):\s?(.+)$/) then
 216           pre=$1; kv=$2
 217           presetnames[presettype][presetcategory].push(pre)
 218           presets[pre]={}
 219           kv.split(',').each {|a|
 220             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 221           }
 222         end
 223       }
 224     end
 225     [presets,presetmenus,presetnames]
 226   end
 227
 228   # ----- whichways(left,bottom,right,top)
 229   #               return array of ways in current bounding box
 230   #               at present, instead of using correct (=more complex) SQL to find
 231   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 232
 233   def whichways(args)
 234     xmin = args[0].to_f-0.01
 235     ymin = args[1].to_f-0.01
 236     xmax = args[2].to_f+0.01
 237     ymax = args[3].to_f+0.01
 238     baselong    = args[4]
 239     basey       = args[5]
 240     masterscale = args[6]
 241
 242     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 243
 244     waylist = ActiveRecord::Base.connection.select_all("SELECT DISTINCT current_way_nodes.id AS wayid"+
 245        "  FROM current_way_nodes,current_nodes,current_ways "+
 246        " WHERE current_nodes.id=current_way_nodes.node_id "+
 247        "   AND current_nodes.visible=1 "+
 248        "   AND current_ways.id=current_way_nodes.id "+
 249        "   AND current_ways.visible=1 "+
 250        "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
 251
 252     ways = waylist.collect {|a| a['wayid'].to_i } # get an array of way IDs
 253
 254     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 "+
 255        "  FROM current_nodes "+
 256        "  LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id "+
 257        " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
 258        "   AND cwn.id IS NULL "+
 259        "   AND current_nodes.visible=1")
 260
 261     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
 262
 263     [ways,points]
 264   end
 265
 266   # ----- whichways_deleted(left,bottom,right,top)
 267   #               return array of deleted ways in current bounding box
 268
 269   def whichways_deleted(args)
 270     xmin = args[0].to_f-0.01
 271     ymin = args[1].to_f-0.01
 272     xmax = args[2].to_f+0.01
 273     ymax = args[3].to_f+0.01
 274     baselong    = args[4]
 275     basey       = args[5]
 276     masterscale = args[6]
 277
 278         sql=<<-EOF
 279                  SELECT DISTINCT current_ways.id
 280                    FROM current_nodes,way_nodes,current_ways
 281                   WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
 282                         AND way_nodes.node_id=current_nodes.id
 283                         AND way_nodes.id=current_ways.id
 284                         AND current_nodes.visible=0
 285                         AND current_ways.visible=0
 286         EOF
 287     waylist = ActiveRecord::Base.connection.select_all(sql)
 288     ways = waylist.collect {|a| a['id'].to_i }
 289         [ways]
 290   end
 291
 292   # ----- getway (objectname, way, baselong, basey, masterscale)
 293   #               returns objectname, array of co-ordinates, attributes,
 294   #                               xmin,xmax,ymin,ymax
 295
 296   def getway(args)
 297     objname,wayid,baselong,basey,masterscale=args
 298     wayid = wayid.to_i
 299     points = []
 300     xmin = ymin =  999999
 301     xmax = ymax = -999999
 302
 303     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 304
 305     readwayquery(wayid).each {|row|
 306       points<<[long2coord(row['longitude'].to_f,baselong,masterscale),lat2coord(row['latitude'].to_f,basey,masterscale),row['id'].to_i,nil,tag2array(row['tags'])]
 307       xmin = [xmin,row['longitude'].to_f].min
 308       xmax = [xmax,row['longitude'].to_f].max
 309       ymin = [ymin,row['latitude'].to_f].min
 310       ymax = [ymax,row['latitude'].to_f].max
 311     }
 312
 313     attributes={}
 314     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 315     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 316
 317     [objname,points,attributes,xmin,xmax,ymin,ymax]
 318   end
 319
 320   # -----       getway_old (objectname, way, version, baselong, basey, masterscale)
 321   #                     returns old version of way
 322
 323   def getway_old(args)
 324     RAILS_DEFAULT_LOGGER.info("  Message: getway_old (server is #{SERVER_URL})")
 325         if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
 326
 327     objname,wayid,version,baselong,basey,masterscale=args
 328     wayid = wayid.to_i
 329     version = version.to_i
 330     xmin = ymin =  999999
 331     xmax = ymax = -999999
 332         points=[]
 333         if version<0
 334           historic=false
 335           version=getlastversion(wayid,version)
 336         else
 337           historic=true
 338         end
 339         readwayquery_old(wayid,version,historic).each { |row|
 340       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)]
 341       xmin=[xmin,row['longitude'].to_f].min
 342       xmax=[xmax,row['longitude'].to_f].max
 343       ymin=[ymin,row['latitude' ].to_f].min
 344       ymax=[ymax,row['latitude' ].to_f].max
 345         }
 346
 347         # get tags from this version
 348     attributes={}
 349     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM way_tags WHERE id=#{wayid} AND version=#{version}"
 350     attrlist.each {|a| attributes[a['k'].gsub(':','|')]=a['v'] }
 351         attributes['history']="Retrieved from v"+version.to_s
 352
 353     [0,objname,points,attributes,xmin,xmax,ymin,ymax,version]
 354   end
 355
 356   # -----       getway_history (way)
 357   #                     returns array of previous versions (version,timestamp,visible,user)
 358   #                     should also show 'created_by'
 359
 360   def getway_history(wayid)
 361         history=[]
 362         sql=<<-EOF
 363         SELECT version,timestamp,visible,display_name,data_public
 364           FROM ways,users
 365          WHERE ways.id=#{wayid}
 366            AND ways.user_id=users.id
 367          ORDER BY version DESC
 368         EOF
 369         histlist=ActiveRecord::Base.connection.select_all(sql)
 370         histlist.each { |row|
 371                 if row['data_public'] then user=row['display_name'] else user='anonymous' end
 372                 history<<[row['version'],row['timestamp'],row['visible'],user]
 373         }
 374         [history]
 375   end
 376
 377   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 378   #                                     baselong, basey, masterscale)
 379   #                     returns current way ID, new way ID, hash of renumbered nodes,
 380   #                                     xmin,xmax,ymin,ymax
 381
 382   def putway(args,renumberednodes)
 383     RAILS_DEFAULT_LOGGER.info("  putway started")
 384     usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
 385     uid=getuserid(usertoken)
 386     if !uid then return -1,"You are not logged in, so the way could not be saved." end
 387
 388     RAILS_DEFAULT_LOGGER.info("  putway authenticated happily")
 389     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
 390     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
 391     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 392     originalway=originalway.to_i
 393         oldversion=oldversion.to_i
 394
 395     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 396
 397         # -- Temporary check for null IDs
 398
 399         points.each do |a|
 400           if a[2]==0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
 401         end
 402
 403     # -- 3.     read original way into memory
 404
 405     xc={}; yc={}; tagc={}; vc={}
 406     if originalway>0
 407       way=originalway
 408           if oldversion==0
 409             readwayquery(way).each { |row|
 410                   id=row['id'].to_i
 411                   xc[id]=row['longitude'].to_f
 412                   yc[id]=row['latitude' ].to_f
 413                   tagc[id]=row['tags']
 414                   vc[id]=1
 415                 }
 416           else
 417             readwayquery_old(way,oldversion,true).each { |row|
 418                   id=row['id'].to_i
 419                   if (id>0) then
 420                         xc[id]=row['longitude'].to_f
 421                         yc[id]=row['latitude' ].to_f
 422                         tagc[id]=row['tags']
 423                         vc[id]=row['visible'].to_i
 424                   end
 425                 }
 426           end
 427       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 428     else
 429       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 430     end
 431
 432     # -- 4.     get version by inserting new row into ways
 433
 434     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 435
 436     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 437
 438     xmin=ymin= 999999
 439     xmax=ymax=-999999
 440     insertsql=''
 441         nodelist=[]
 442
 443     points.each_index do |i|
 444       xs=coord2long(points[i][0],masterscale,baselong)
 445       ys=coord2lat(points[i][1],masterscale,basey)
 446       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 447       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 448       node=points[i][2].to_i
 449           tagstr=array2tag(points[i][4])
 450       tagsql="'"+sqlescape(tagstr)+"'"
 451       lat=(ys * 10000000).round
 452       long=(xs * 10000000).round
 453       tile=QuadTile.tile_for_point(ys, xs)
 454
 455       # compare node
 456       if node<0
 457         # new node - create
 458                 if renumberednodes[node.to_s].nil?
 459           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})")
 460                   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})")
 461           points[i][2]=newnode
 462           nodelist.push(newnode)
 463           renumberednodes[node.to_s]=newnode.to_s
 464                 else
 465           points[i][2]=renumberednodes[node.to_s].to_i
 466                 end
 467
 468       elsif xc.has_key?(node)
 469                 nodelist.push(node)
 470         # old node from original way - update
 471         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node] or vc[node]==0)
 472           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})")
 473           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}")
 474         end
 475       else
 476         # old node, created in another way and now added to this way
 477       end
 478     end
 479
 480
 481         # -- 6a. delete any nodes not in modified way
 482
 483     createuniquenodes(way,db_uqn,nodelist)      # nodes which appear in this way but no other
 484
 485     sql=<<-EOF
 486         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 487         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 488           FROM current_nodes AS cn,#{db_uqn}
 489          WHERE cn.id=node_id
 490     EOF
 491     ActiveRecord::Base.connection.insert(sql)
 492
 493     sql=<<-EOF
 494       UPDATE current_nodes AS cn, #{db_uqn}
 495          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 496        WHERE cn.id=node_id
 497     EOF
 498     ActiveRecord::Base.connection.update(sql)
 499
 500         deleteuniquenoderelations(db_uqn,uid,db_now)
 501     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 502
 503         #       6b. insert new version of route into way_nodes
 504
 505     insertsql =''
 506     currentsql=''
 507     sequence  =1
 508     points.each do |p|
 509       if insertsql !='' then insertsql +=',' end
 510       if currentsql!='' then currentsql+=',' end
 511       insertsql +="(#{way},#{p[2]},#{sequence},#{version})"
 512       currentsql+="(#{way},#{p[2]},#{sequence})"
 513       sequence  +=1
 514     end
 515
 516     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}");
 517     ActiveRecord::Base.connection.insert( "INSERT INTO         way_nodes (id,node_id,sequence_id,version) VALUES #{insertsql}");
 518     ActiveRecord::Base.connection.insert( "INSERT INTO current_way_nodes (id,node_id,sequence_id        ) VALUES #{currentsql}");
 519
 520     # -- 7. insert new way tags
 521
 522     insertsql =''
 523     currentsql=''
 524     attributes.each do |k,v|
 525       if v=='' or v.nil? then next end
 526       if v[0,6]=='(type ' then next end
 527       if insertsql !='' then insertsql +=',' end
 528       if currentsql!='' then currentsql+=',' end
 529       insertsql +="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"',#{version})"
 530       currentsql+="(#{way},'"+sqlescape(k.gsub('|',':'))+"','"+sqlescape(v)+"')"
 531     end
 532
 533     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 534     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 535     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 536
 537     [0,originalway,way,renumberednodes,xmin,xmax,ymin,ymax]
 538   end
 539
 540   # -----       putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
 541   #                     returns current id, new id
 542   #                     if new: add new row to current_nodes and nodes
 543   #                     if old: add new row to nodes, update current_nodes
 544
 545   def putpoi(args)
 546     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
 547     uid=getuserid(usertoken)
 548     if !uid then return -1,"You are not logged in, so the point could not be saved." end
 549
 550     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
 551     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 552
 553     id=id.to_i
 554     visible=visible.to_i
 555         if visible==0 then
 556                 # if deleting, check node hasn't become part of a way
 557                 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")
 558                 unless inway.nil? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
 559                 deleteitemrelations(id,'node',uid,db_now)
 560         end
 561
 562     x=coord2long(x.to_f,masterscale,baselong)
 563     y=coord2lat(y.to_f,masterscale,basey)
 564     tagsql="'"+sqlescape(array2tag(tags))+"'"
 565     lat=(y * 10000000).round
 566     long=(x * 10000000).round
 567     tile=QuadTile.tile_for_point(y, x)
 568
 569     if (id>0) then
 570         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})");
 571         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}");
 572         newid=id
 573     else
 574         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})");
 575               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})");
 576     end
 577     [0,id,newid]
 578   end
 579
 580   # -----       getpoi (id,baselong,basey,masterscale)
 581   #                     returns id,x,y,tag array
 582
 583   def getpoi(args)
 584         id,baselong,basey,masterscale=args; id=id.to_i
 585         poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
 586                 "FROM current_nodes WHERE visible=1 AND id=#{id}")
 587         if poi.nil? then return [nil,nil,nil,''] end
 588         [id,
 589          long2coord(poi['lng'].to_f,baselong,masterscale),
 590          lat2coord(poi['lat'].to_f,basey,masterscale),
 591          tag2array(poi['tags'])]
 592   end
 593
 594   # -----       deleteway (user token, way, nodes to keep)
 595   #                     returns way ID only
 596
 597   def deleteway(args)
 598     usertoken,way=args
 599
 600     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 601     uid=getuserid(usertoken)
 602     if !uid then return -1,"You are not logged in, so the way could not be deleted." end
 603
 604     way=way.to_i
 605     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
 606     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
 607     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 608
 609     # - delete any otherwise unused nodes
 610
 611     createuniquenodes(way,db_uqn,[])
 612
 613 #       unless (preserve.empty?) then
 614 #               ActiveRecord::Base.connection.execute("DELETE FROM #{db_uqn} WHERE node_id IN ("+preserve.join(',')+")")
 615 #       end
 616
 617     sql=<<-EOF
 618         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 619         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 620           FROM current_nodes AS cn,#{db_uqn}
 621          WHERE cn.id=node_id
 622     EOF
 623     ActiveRecord::Base.connection.insert(sql)
 624
 625     sql=<<-EOF
 626       UPDATE current_nodes AS cn, #{db_uqn}
 627          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 628        WHERE cn.id=node_id
 629     EOF
 630     ActiveRecord::Base.connection.update(sql)
 631
 632         deleteuniquenoderelations(db_uqn,uid,db_now)
 633     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 634
 635     # - delete way
 636
 637     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 638     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 639     ActiveRecord::Base.connection.execute("DELETE FROM current_way_nodes WHERE id=#{way}")
 640     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 641         deleteitemrelations(way,'way',uid,db_now)
 642     [0,way]
 643 end
 644
 645
 646
 647 # ====================================================================
 648 # Support functions for remote calls
 649
 650 def readwayquery(id)
 651   ActiveRecord::Base.connection.select_all "SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,current_nodes.id,tags "+
 652       "    FROM current_way_nodes,current_nodes "+
 653       "   WHERE current_way_nodes.id=#{id} "+
 654       "     AND current_way_nodes.node_id=current_nodes.id "+
 655       "     AND current_nodes.visible=1 "+
 656       "   ORDER BY sequence_id"
 657 end
 658
 659 def getlastversion(id,version)
 660   row=ActiveRecord::Base.connection.select_one("SELECT version FROM ways WHERE id=#{id} AND visible=1 ORDER BY version DESC LIMIT 1")
 661   row['version']
 662 end
 663
 664 def readwayquery_old(id,version,historic)
 665   # Node handling on undelete (historic=false):
 666   # - always use the node specified, even if it's moved
 667
 668   # Node handling on revert (historic=true):
 669   # - if it's a visible node, use a new node id (i.e. not mucking up the old one)
 670   #   which means the SWF needs to allocate new ids
 671   # - if it's an invisible node, we can reuse the old node id
 672
 673   # get node list from specified version of way,
 674   # and the _current_ lat/long/tags of each node
 675
 676   row=ActiveRecord::Base.connection.select_one("SELECT timestamp FROM ways WHERE version=#{version} AND id=#{id}")
 677   waytime=row['timestamp']
 678
 679   sql=<<-EOF
 680         SELECT cn.id,visible,latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 681           FROM way_nodes wn,current_nodes cn
 682          WHERE wn.version=#{version}
 683            AND wn.id=#{id}
 684            AND wn.node_id=cn.id
 685          ORDER BY sequence_id
 686   EOF
 687   rows=ActiveRecord::Base.connection.select_all(sql)
 688
 689   # if historic (full revert), get the old version of each node,
 690   # and use this (though with a new id) if it differs from the current one
 691   if historic then
 692         rows.each_index do |i|
 693           sql=<<-EOF
 694           SELECT latitude*0.0000001 AS latitude,longitude*0.0000001 AS longitude,tags
 695             FROM nodes
 696            WHERE id=#{rows[i]['id']}
 697              AND timestamp<="#{waytime}"
 698            ORDER BY timestamp DESC
 699            LIMIT 1
 700           EOF
 701           row=ActiveRecord::Base.connection.select_one(sql)
 702           unless row.nil? then
 703             nx=row['longitude'].to_f
 704             ny=row['latitude'].to_f
 705             if (nx!=rows[i]['longitude'].to_f or ny!=rows[i]['latitude'].to_f or row['tags']!=rows[i]['tags']) then
 706                   rows[i]['id']=-1
 707                   # This generates a new node id if x/y/tags differ from current node.
 708                   # Strictly speaking, it need only do this for uniquenodes, but we're
 709                   # not generating uniquenodes for historic ways (yet!).
 710             end
 711                 rows[i]['longitude']=nx
 712                 rows[i]['latitude' ]=ny
 713                 rows[i]['tags'     ]=row['tags']
 714           end
 715     end
 716   end
 717   rows
 718 end
 719
 720 def createuniquenodes(way,uqn_name,nodelist)
 721         # Find nodes which appear in this way but no others
 722         sql=<<-EOF
 723         CREATE TEMPORARY TABLE #{uqn_name}
 724                                         SELECT a.node_id
 725                                           FROM (SELECT DISTINCT node_id FROM current_way_nodes
 726                                                         WHERE id=#{way}) a
 727                                  LEFT JOIN current_way_nodes b
 728                                                 ON b.node_id=a.node_id
 729                                            AND b.id!=#{way}
 730                                          WHERE b.node_id IS NULL
 731         EOF
 732         unless nodelist.empty? then
 733           sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
 734         end
 735         ActiveRecord::Base.connection.execute(sql)
 736 end
 737
 738
 739
 740 # ====================================================================
 741 # Relations handling
 742 # deleteuniquenoderelations(uqn_name,uid,db_now)
 743 # deleteitemrelations(way|node,'way'|'node',uid,db_now)
 744
 745 def deleteuniquenoderelations(uqn_name,uid,db_now)
 746         sql=<<-EOF
 747         SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr
 748          WHERE crm.member_id=node_id
 749            AND crm.member_type='node'
 750            AND crm.id=cr.id
 751            AND cr.visible=1
 752         EOF
 753
 754         relnodes=ActiveRecord::Base.connection.select_all(sql)
 755         relnodes.each do |a|
 756                 removefromrelation(a['node_id'],'node',a['id'],uid,db_now)
 757         end
 758 end
 759
 760 def deleteitemrelations(objid,type,uid,db_now)
 761         sql=<<-EOF
 762         SELECT cr.id FROM current_relation_members crm,current_relations cr
 763          WHERE crm.member_id=#{objid}
 764            AND crm.member_type='#{type}'
 765            AND crm.id=cr.id
 766            AND cr.visible=1
 767         EOF
 768
 769         relways=ActiveRecord::Base.connection.select_all(sql)
 770         relways.each do |a|
 771                 removefromrelation(objid,type,a['id'],uid,db_now)
 772         end
 773 end
 774
 775 def removefromrelation(objid,type,relation,uid,db_now)
 776         rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
 777
 778         tagsql=<<-EOF
 779         INSERT INTO relation_tags (id,k,v,version)
 780         SELECT id,k,v,#{rver} FROM current_relation_tags
 781          WHERE id=#{relation}
 782         EOF
 783         ActiveRecord::Base.connection.insert(tagsql)
 784
 785         membersql=<<-EOF
 786         INSERT INTO relation_members (id,member_type,member_id,member_role,version)
 787         SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members
 788          WHERE id=#{relation}
 789            AND (member_id!=#{objid} OR member_type!='#{type}')
 790         EOF
 791         ActiveRecord::Base.connection.insert(membersql)
 792
 793         ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
 794         ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
 795 end
 796
 797
 798 def sqlescape(a)
 799   a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr}
 800 end
 801
 802 def tag2array(a)
 803   tags={}
 804   Tags.split(a) do |k, v|
 805     tags[k.gsub(':','|')]=v
 806   end
 807   tags
 808 end
 809
 810 def array2tag(a)
 811   tags = []
 812   a.each do |k,v|
 813     if v=='' then next end
 814     if v[0,6]=='(type ' then next end
 815     tags << [k.gsub('|',':'), v]
 816   end
 817   return Tags.join(tags)
 818 end
 819
 820 def getuserid(token)
 821   if (token =~ /^(.+)\+(.+)$/) then
 822     user = User.authenticate(:username => $1, :password => $2)
 823   else
 824     user = User.authenticate(:token => token)
 825   end
 826
 827   return user ? user.id : nil;
 828 end
 829
 830
 831
 832 # ====================================================================
 833 # AMF read subroutines
 834
 835 # ----- getint          return two-byte integer
 836 # ----- getlong         return four-byte long
 837 # ----- getstring       return string with two-byte length
 838 # ----- getdouble       return eight-byte double-precision float
 839 # ----- getobject       return object/hash
 840 # ----- getarray        return numeric array
 841
 842 def getint(s)
 843   s.getc*256+s.getc
 844 end
 845
 846 def getlong(s)
 847   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 848 end
 849
 850 def getstring(s)
 851   len=s.getc*256+s.getc
 852   s.read(len)
 853 end
 854
 855 def getdouble(s)
 856   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 857   a[0]
 858 end
 859
 860 def getarray(s)
 861   len=getlong(s)
 862   arr=[]
 863   for i in (0..len-1)
 864     arr[i]=getvalue(s)
 865   end
 866   arr
 867 end
 868
 869 def getobject(s)
 870   arr={}
 871   while (key=getstring(s))
 872     if (key=='') then break end
 873     arr[key]=getvalue(s)
 874   end
 875   s.getc                # skip the 9 'end of object' value
 876   arr
 877 end
 878
 879 # ----- getvalue        parse and get value
 880
 881 def getvalue(s)
 882   case s.getc
 883         when 0; return getdouble(s)                     # number
 884         when 1; return s.getc                           # boolean
 885         when 2; return getstring(s)                     # string
 886         when 3; return getobject(s)                     # object/hash
 887         when 5; return nil                                      # null
 888         when 6; return nil                                      # undefined
 889         when 8; s.read(4)                                       # mixedArray
 890                         return getobject(s)                     #  |
 891         when 10;return getarray(s)                      # array
 892         else;   return nil                                      # error
 893   end
 894 end
 895
 896 # ====================================================================
 897 # AMF write subroutines
 898
 899 # ----- putdata         envelope data into AMF writeable form
 900 # ----- encodevalue     pack variables as AMF
 901
 902 def putdata(index,n)
 903   d =encodestring(index+"/onResult")
 904   d+=encodestring("null")
 905   d+=[-1].pack("N")
 906   d+=encodevalue(n)
 907 end
 908
 909 def encodevalue(n)
 910   case n.class.to_s
 911   when 'Array'
 912     a=10.chr+encodelong(n.length)
 913     n.each do |b|
 914       a+=encodevalue(b)
 915     end
 916     a
 917   when 'Hash'
 918     a=3.chr
 919     n.each do |k,v|
 920       a+=encodestring(k)+encodevalue(v)
 921     end
 922     a+0.chr+0.chr+9.chr
 923   when 'String'
 924     2.chr+encodestring(n)
 925   when 'Bignum','Fixnum','Float'
 926     0.chr+encodedouble(n)
 927   when 'NilClass'
 928     5.chr
 929   else
 930     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 931   end
 932 end
 933
 934 # ----- encodestring    encode string with two-byte length
 935 # ----- encodedouble    encode number as eight-byte double precision float
 936 # ----- encodelong              encode number as four-byte long
 937
 938 def encodestring(n)
 939   a,b=n.size.divmod(256)
 940   a.chr+b.chr+n
 941 end
 942
 943 def encodedouble(n)
 944   [n].pack('G')
 945 end
 946
 947 def encodelong(n)
 948   [n].pack('N')
 949 end
 950
 951 # ====================================================================
 952 # Co-ordinate conversion
 953
 954 def lat2coord(a,basey,masterscale)
 955   -(lat2y(a)-basey)*masterscale+250
 956 end
 957
 958 def long2coord(a,baselong,masterscale)
 959   (a-baselong)*masterscale+350
 960 end
 961
 962 def lat2y(a)
 963   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 964 end
 965
 966 def coord2lat(a,masterscale,basey)
 967   y2lat((a-250)/-masterscale+basey)
 968 end
 969
 970 def coord2long(a,masterscale,baselong)
 971   (a-350)/masterscale+baselong
 972 end
 973
 974 def y2lat(a)
 975   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 976 end
 977
 978 end