app/controllers/amf_controller.rb

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