app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   # to log:
   5   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   6
   7   # ====================================================================
   8   # Main AMF handler
   9
  10   # ---- talk   process AMF request
  11
  12   def talk
  13     req=StringIO.new(request.raw_post)  # Get POST data as request
  14     req.read(2)                                                 # Skip version indicator and client ID
  15     results={}                                                  # Results of each body
  16
  17     # -------------
  18     # Parse request
  19
  20     headers=getint(req)                                 # Read number of headers
  21
  22     headers.times do                                # Read each header
  23       name=getstring(req)                               #  |
  24       req.getc                                  #  | skip boolean
  25       value=getvalue(req)                               #  |
  26       header["name"]=value                              #  |
  27     end
  28
  29     bodies=getint(req)                                  # Read number of bodies
  30     bodies.times do                                     # Read each body
  31       message=getstring(req)                    #  | get message name
  32       index=getstring(req)                              #  | get index in response sequence
  33       bytes=getlong(req)                                #  | get total size in bytes
  34       args=getvalue(req)                                #  | get response (probably an array)
  35
  36       RAILS_DEFAULT_LOGGER.info("  Message: #{message}")
  37
  38       case message
  39                   when 'getpresets';    results[index]=putdata(index,getpresets)
  40                   when 'whichways';             results[index]=putdata(index,whichways(args))
  41                   when 'getway';                results[index]=putdata(index,getway(args))
  42                   when 'putway';                results[index]=putdata(index,putway(args))
  43                   when 'deleteway';             results[index]=putdata(index,deleteway(args))
  44       end
  45     end
  46
  47     # ------------------
  48     # Write out response
  49
  50     RAILS_DEFAULT_LOGGER.info("  Response: start")
  51     response.headers["Content-Type"]="application/x-amf"
  52     a,b=results.length.divmod(256)
  53         render :text => proc { |response, output|
  54         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  55                 results.each do |k,v|
  56                   RAILS_DEFAULT_LOGGER.info("  Response: encode #{k}")
  57                   output.write(v)
  58                 end
  59         }
  60     RAILS_DEFAULT_LOGGER.info("  Response: end")
  61
  62   end
  63
  64   private
  65
  66   # ====================================================================
  67   # Remote calls
  68
  69   # -----       getpresets
  70   #             return presets,presetmenus and presetnames arrays
  71
  72   def getpresets
  73     presets={}
  74     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
  75     presetnames={}; presetnames['point']={}; presetnames['way']={}
  76     presettype=''
  77     presetcategory=''
  78
  79     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  80
  81     #           File.open("config/potlatch/presets.txt") do |file|
  82
  83     # Temporary patch to get around filepath problem
  84     # To remove this patch and make the code nice again:
  85     # 1. uncomment above line
  86     # 2. fix the path in the above line
  87     # 3. delete this here document, and the following line (StringIO....)
  88
  89     txt=<<-EOF
  90 way/road
  91 motorway: highway=motorway,ref=(type road number)
  92 trunk road: highway=trunk,ref=(type road number),name=(type road name)
  93 primary road: highway=primary,ref=(type road number),name=(type road name)
  94 secondary road: highway=secondary,ref=(type road number),name=(type road name)
  95 residential road: highway=residential,name=(type road name)
  96 unclassified road: highway=unclassified,name=(type road name)
  97
  98 way/footway
  99 footpath: highway=footway,foot=yes
 100 bridleway: highway=bridleway,foot=yes,horse=yes,bicycle=yes
 101 byway: highway=byway,foot=yes,horse=yes,bicycle=yes,motorcar=yes
 102 permissive path: highway=footway,foot=permissive
 103
 104 way/cycleway
 105 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 106 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 107 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 108 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 109
 110 way/waterway
 111 canal: waterway=canal,name=(type name here)
 112 navigable river: waterway=river,boat=yes,name=(type name here)
 113 navigable drain: waterway=drain,boat=yes,name=(type name here)
 114 derelict canal: waterway=derelict_canal,name=(type name here)
 115 unnavigable river: waterway=river,boat=no,name=(type name here)
 116 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 117
 118 way/railway
 119 railway: railway=rail
 120 tramway: railway=tram
 121 light railway: railway=light_rail
 122 preserved railway: railway=preserved
 123 disused railway tracks: railway=disused
 124 course of old railway: railway=abandoned
 125
 126 point/road
 127 mini roundabout: highway=mini_roundabout
 128 traffic lights: highway=traffic_signals
 129
 130 point/footway
 131 bridge: highway=bridge
 132 gate: highway=gate
 133 stile: highway=stile
 134 cattle grid: highway=cattle_grid
 135
 136 point/cycleway
 137 gate: highway=gate
 138
 139 point/waterway
 140 lock gate: waterway=lock_gate
 141 weir: waterway=weir
 142 aqueduct: waterway=aqueduct
 143 winding hole: waterway=turning_point
 144 mooring: waterway=mooring
 145
 146 point/railway
 147 station: railway=station
 148 viaduct: railway=viaduct
 149 level crossing: railway=crossing
 150 EOF
 151
 152     StringIO.open(txt) do |file|
 153       file.each_line {|line|
 154         t=line.chomp
 155         if (t=~/(\w+)\/(\w+)/) then
 156           presettype=$1
 157           presetcategory=$2
 158           presetmenus[presettype].push(presetcategory)
 159           presetnames[presettype][presetcategory]=["(no preset)"]
 160         elsif (t=~/^(.+):\s?(.+)$/) then
 161           pre=$1; kv=$2
 162           presetnames[presettype][presetcategory].push(pre)
 163           presets[pre]={}
 164           kv.split(',').each {|a|
 165             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 166           }
 167         end
 168       }
 169     end
 170     return [presets,presetmenus,presetnames]
 171   end
 172
 173   # -----       whichways(left,bottom,right,top)
 174   #             return array of ways in current bounding box
 175   #             at present, instead of using correct (=more complex) SQL to find
 176   #             corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 177
 178   def whichways(args)
 179     xmin = args[0].to_f-0.01
 180     ymin = args[1].to_f-0.01
 181     xmax = args[2].to_f+0.01
 182     ymax = args[3].to_f+0.01
 183
 184     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 185
 186     waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 187        "  FROM current_way_segments,current_segments,current_nodes,current_ways "+
 188        " WHERE segment_id=current_segments.id "+
 189        "   AND current_segments.visible=1 "+
 190        "   AND node_a=current_nodes.id "+
 191            "   AND current_ways.id=current_way_segments.id "+
 192            "   AND current_ways.visible=1 "+
 193        "   AND (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 194        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+")")
 195
 196        ways = waylist.collect {|a| a.wayid.to_i } # get an array of way id's
 197
 198        pointlist =ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.tags "+
 199        "  FROM current_nodes "+
 200        "  LEFT OUTER JOIN current_segments cs1 ON cs1.node_a=current_nodes.id "+
 201        "  LEFT OUTER JOIN current_segments cs2 ON cs2.node_b=current_nodes.id "+
 202        " WHERE (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 203        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+") "+
 204        "   AND cs1.id IS NULL AND cs2.id IS NULL "+
 205        "   AND current_nodes.visible=1")
 206
 207             points = pointlist.collect {|a| [a['id'],tag2array(a['tags'])]      } # get a list of node ids and their tags
 208
 209     return [ways,points]
 210   end
 211
 212   # -----       getway (objectname, way, baselong, basey, masterscale)
 213   #                     returns objectname, array of co-ordinates, attributes,
 214   #                                     xmin,xmax,ymin,ymax
 215
 216   def getway(args)
 217     objname,wayid,baselong,basey,masterscale=args
 218     wayid = wayid.to_i
 219     points = []
 220     lastid = -1
 221     xmin = ymin = 999999
 222     xmax = ymax = -999999
 223
 224     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 225
 226     readwayquery(wayid).each {|row|
 227       xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 228       xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 229       points << [xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0] if (row['id1'].to_i!=lastid)
 230       lastid = row['id2'].to_i
 231       points << [xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 232       xmin = [xmin,row['long1'].to_f,row['long2'].to_f].min
 233       xmax = [xmax,row['long1'].to_f,row['long2'].to_f].max
 234       ymin = [ymin,row['lat1'].to_f,row['lat2'].to_f].min
 235       ymax = [ymax,row['lat1'].to_f,row['lat2'].to_f].max
 236     }
 237
 238     attributes={}
 239     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 240     attrlist.each {|a| attributes[a['k']]=a['v'] }
 241
 242     [objname,points,attributes,xmin,xmax,ymin,ymax]
 243   end
 244
 245   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 246   #                                     baselong, basey, masterscale)
 247   #                     returns current way ID, new way ID, hash of renumbered nodes,
 248   #                                     xmin,xmax,ymin,ymax
 249
 250   def putway(args)
 251     usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 252     uid=getuserid(usertoken)
 253     return if !uid
 254     db_uqs='uniq'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # temp uniquesegments table name, typically 51 chars
 255     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
 256     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 257     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 258     originalway=originalway.to_i
 259
 260     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 261
 262     # -- 3.     read original way into memory
 263
 264     xc={}; yc={}; tagc={}; seg={}
 265     if originalway>0
 266       way=originalway
 267       readwayquery(way).each { |row|
 268         id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 269         id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 270         seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 271       }
 272           ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 273     else
 274       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 275     end
 276
 277     # -- 4.     get version by inserting new row into ways
 278
 279     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 280
 281     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 282
 283     xmin = ymin = 999999
 284     xmax = ymax = -999999
 285     insertsql = ''
 286     renumberednodes={}
 287
 288     points.each_index do |i|
 289       xs=coord2long(points[i][0],masterscale,baselong)
 290       ys=coord2lat(points[i][1],masterscale,basey)
 291       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 292       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 293       node=points[i][2].to_i
 294       tagstr=array2tag(points[i][4])
 295       tagsql="'"+sqlescape(tagstr)+"'"
 296
 297       # compare node
 298       if node<0
 299         # new node - create
 300         newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags) VALUES (           #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 301                         ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 302         points[i][2]=newnode
 303         renumberednodes[node.to_s]=newnode.to_s
 304
 305       elsif xc.has_key?(node)
 306         # old node from original way - update
 307         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
 308           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 309           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{ys},longitude=#{xs},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1 WHERE id=#{node}")
 310         end
 311       else
 312         # old node, created in another way and now added to this way
 313       end
 314
 315     end
 316
 317
 318     # -- 6.i compare segments
 319
 320     numberedsegments={}
 321     seglist=''                          # list of existing segments that we want to keep
 322     for i in (0..(points.length-2))
 323       if (points[i+1][3].to_i==0) then next end
 324       segid=points[i+1][5].to_i
 325       from =points[i  ][2].to_i
 326       to   =points[i+1][2].to_i
 327       if seg.has_key?(segid)
 328         if seg[segid]=="#{from}-#{to}" then
 329           if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 330           next
 331         end
 332       end
 333       segid=ActiveRecord::Base.connection.insert("INSERT INTO current_segments (   node_a,node_b,timestamp,user_id,visible,tags) VALUES (         #{from},#{to},#{db_now},#{uid},1,'')")
 334                 ActiveRecord::Base.connection.insert("INSERT INTO segments         (id,node_a,node_b,timestamp,user_id,visible,tags) VALUES (#{segid},#{from},#{to},#{db_now},#{uid},1,'')")
 335       points[i+1][5]=segid
 336       numberedsegments[(i+1).to_s]=segid.to_s
 337     end
 338     # numberedsegments.each{|a,b| RAILS_DEFAULT_LOGGER.error("Sending back: seg no. #{a} -> id #{b}") }
 339
 340
 341     # -- 6.ii insert new way segments
 342
 343     createuniquesegments(way,db_uqs,seglist)    # segments which appear in this way but no other
 344
 345     #           delete segments from uniquesegments (and not in modified way)
 346
 347     sql=<<-EOF
 348       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 349       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 350         FROM current_segments AS cs, #{db_uqs} AS us
 351        WHERE cs.id=us.segment_id AND cs.visible=1
 352     EOF
 353     ActiveRecord::Base.connection.insert(sql)
 354
 355     sql=<<-EOF
 356          UPDATE current_segments AS cs, #{db_uqs} AS us
 357           SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 358         WHERE cs.id=us.segment_id AND cs.visible=1
 359     EOF
 360     ActiveRecord::Base.connection.update(sql)
 361
 362     #           delete nodes not in modified way or any other segments
 363
 364     createuniquenodes(db_uqs,db_uqn)    # nodes which appear in this way but no other
 365
 366     sql=<<-EOF
 367                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 368                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 369                   FROM current_nodes AS cn,#{db_uqn}
 370                  WHERE cn.id=node_id
 371     EOF
 372     ActiveRecord::Base.connection.insert(sql)
 373
 374     sql=<<-EOF
 375       UPDATE current_nodes AS cn, #{db_uqn}
 376          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 377        WHERE cn.id=node_id
 378     EOF
 379     ActiveRecord::Base.connection.update(sql)
 380
 381     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 382     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 383
 384     #           insert new version of route into way_segments
 385
 386     insertsql =''
 387     currentsql=''
 388     sequence  =1
 389     for i in (0..(points.length-2))
 390       if (points[i+1][3].to_i==0) then next end
 391       if insertsql !='' then insertsql +=',' end
 392       if currentsql!='' then currentsql+=',' end
 393       insertsql +="(#{way},#{points[i+1][5]},#{version})"
 394       currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 395       sequence  +=1
 396     end
 397
 398     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 399     ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 400     ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 401
 402     # -- 7. insert new way tags
 403
 404     insertsql =''
 405     currentsql=''
 406     attributes.each do |k,v|
 407       if v=='' then next end
 408       if v[0,6]=='(type ' then next end
 409       if insertsql !='' then insertsql +=',' end
 410       if currentsql!='' then currentsql+=',' end
 411       insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})"
 412       currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 413     end
 414
 415     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 416     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 417     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 418
 419     [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 420   end
 421
 422   # -----       deleteway (user token, way)
 423   #                     returns way ID only
 424
 425   def deleteway(args)
 426     usertoken,way=args
 427
 428     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 429
 430     uid=getuserid(usertoken); if !uid then return end
 431         way=way.to_i
 432
 433         db_uqs='uniq'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # temp uniquesegments table name, typically 51 chars
 434         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
 435         db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 436         ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 437         createuniquesegments(way,db_uqs,'')
 438
 439         # -     delete any otherwise unused segments
 440
 441         sql=<<-EOF
 442       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 443       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 444         FROM current_segments AS cs, #{db_uqs} AS us
 445        WHERE cs.id=us.segment_id
 446     EOF
 447         ActiveRecord::Base.connection.insert(sql)
 448
 449         sql=<<-EOF
 450       UPDATE current_segments AS cs, #{db_uqs} AS us
 451          SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 452        WHERE cs.id=us.segment_id
 453     EOF
 454         ActiveRecord::Base.connection.update(sql)
 455
 456         # - delete any unused nodes
 457
 458     createuniquenodes(db_uqs,db_uqn)
 459
 460         sql=<<-EOF
 461                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 462                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 463                   FROM current_nodes AS cn,#{db_uqn}
 464                  WHERE cn.id=node_id
 465     EOF
 466         ActiveRecord::Base.connection.insert(sql)
 467
 468         sql=<<-EOF
 469       UPDATE current_nodes AS cn, #{db_uqn}
 470          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 471        WHERE cn.id=node_id
 472     EOF
 473         ActiveRecord::Base.connection.update(sql)
 474
 475         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 476         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 477
 478         # - delete way
 479
 480         ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 481         ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 482         ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 483         ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 484
 485         way
 486 end
 487
 488 # ====================================================================
 489 # Support functions for remote calls
 490
 491 def readwayquery(id)
 492   ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+
 493       "           n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 494       "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 495       "   WHERE current_way_segments.id=#{id} "+
 496       "     AND segment_id=current_segments.id "+
 497           "     AND current_segments.visible=1 "+
 498       "     AND n1.id=node_a and n2.id=node_b "+
 499       "     AND n1.visible=1 AND n2.visible=1 "+
 500       "   ORDER BY sequence_id"
 501 end
 502
 503 def createuniquesegments(way,uqs_name,seglist)
 504   # Finds segments which appear in (previous version of) this way and no other
 505   sql=<<-EOF
 506       CREATE TEMPORARY TABLE #{uqs_name}
 507               SELECT a.segment_id
 508                 FROM (SELECT DISTINCT segment_id FROM current_way_segments
 509                   WHERE id = #{way}) a
 510              LEFT JOIN current_way_segments b
 511                 ON b.segment_id = a.segment_id
 512                  AND b.id != #{way}
 513                WHERE b.segment_id IS NULL
 514     EOF
 515   if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end
 516   ActiveRecord::Base.connection.execute(sql)
 517 end
 518
 519 def createuniquenodes(uqs_name,uqn_name)
 520         # Finds nodes which appear in uniquesegments but no other segments
 521         sql=<<-EOF
 522                 CREATE TEMPORARY TABLE #{uqn_name}
 523                            SELECT DISTINCT node_id
 524                               FROM (SELECT cn.id AS node_id
 525                                                   FROM current_nodes AS cn,
 526                                                        current_segments AS cs,
 527                                                        #{uqs_name} AS us
 528                                                  WHERE cs.id=us.segment_id
 529                                                    AND (cn.id=cs.node_a OR cn.id=cs.node_b)) AS n
 530                                          LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 531                                          LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 532                                              WHERE cs2.node_a IS NULL
 533                                                AND cs3.node_b IS NULL
 534         EOF
 535         ActiveRecord::Base.connection.execute(sql)
 536 end
 537
 538 def sqlescape(a)
 539   a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 540 end
 541
 542 def tag2array(a)
 543   tags={}
 544   a.gsub(';;;','#%').split(';').each do |b|
 545     b.gsub!('#%',';;;')
 546     b.gsub!('===','#%')
 547     k,v=b.split('=')
 548     if k.nil? then k='' end
 549     if v.nil? then v='' end
 550     tags[k.gsub('#%','=')]=v.gsub('#%','=')
 551   end
 552   tags
 553 end
 554
 555 def array2tag(a)
 556   str=''
 557   a.each do |k,v|
 558     if v=='' then next end
 559     if v[0,6]=='(type ' then next end
 560     if str!='' then str+=';' end
 561     str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 562   end
 563   str
 564 end
 565
 566 def getuserid(token)
 567   token=sqlescape(token)
 568   if (token=~/^(.+)\+(.+)$/) then
 569     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND email='#{$1}' AND pass_crypt=MD5('#{$2}')")
 570   else
 571     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND token='#{token}'")
 572   end
 573 end
 574
 575
 576
 577 # ====================================================================
 578 # AMF read subroutines
 579
 580 # ----- getint          return two-byte integer
 581 # ----- getlong         return four-byte long
 582 # ----- getstring       return string with two-byte length
 583 # ----- getdouble       return eight-byte double-precision float
 584 # ----- getobject       return object/hash
 585 # ----- getarray        return numeric array
 586
 587 def getint(s)
 588   s.getc*256+s.getc
 589 end
 590
 591 def getlong(s)
 592   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 593 end
 594
 595 def getstring(s)
 596   len=s.getc*256+s.getc
 597   s.read(len)
 598 end
 599
 600 def getdouble(s)
 601   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 602   a[0]
 603 end
 604
 605 def getarray(s)
 606   len=getlong(s)
 607   arr=[]
 608   for i in (0..len-1)
 609     arr[i]=getvalue(s)
 610   end
 611   arr
 612 end
 613
 614 def getobject(s)
 615   arr={}
 616   while (key=getstring(s))
 617     if (key=='') then break end
 618     arr[key]=getvalue(s)
 619   end
 620   s.getc                # skip the 9 'end of object' value
 621   arr
 622 end
 623
 624 # ----- getvalue        parse and get value
 625
 626 def getvalue(s)
 627   case s.getc
 628   when 0;       return getdouble(s)                     # number
 629   when 1;       return s.getc                           # boolean
 630   when 2;       return getstring(s)                     # string
 631   when 3;       return getobject(s)                     # object/hash
 632   when 5;       return nil                                      # null
 633   when 6;       return nil                                      # undefined
 634   when 8;       s.read(4)                                       # mixedArray
 635     return getobject(s)                 #  |
 636   when 10;return getarray(s)                    # array
 637   else; return nil                                      # error
 638   end
 639 end
 640
 641 # ====================================================================
 642 # AMF write subroutines
 643
 644 # ----- putdata         envelope data into AMF writeable form
 645 # ----- encodevalue     pack variables as AMF
 646
 647 def putdata(index,n)
 648   d =encodestring(index+"/onResult")
 649   d+=encodestring("null")
 650   d+=[-1].pack("N")
 651   d+=encodevalue(n)
 652 end
 653
 654 def encodevalue(n)
 655   case n.class.to_s
 656   when 'Array'
 657     a=10.chr+encodelong(n.length)
 658     n.each do |b|
 659       a+=encodevalue(b)
 660     end
 661     a
 662   when 'Hash'
 663     a=3.chr
 664     n.each do |k,v|
 665       a+=encodestring(k)+encodevalue(v)
 666     end
 667     a+0.chr+0.chr+9.chr
 668   when 'String'
 669     2.chr+encodestring(n)
 670   when 'Bignum','Fixnum','Float'
 671     0.chr+encodedouble(n)
 672   when 'NilClass'
 673     5.chr
 674   else
 675     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 676   end
 677 end
 678
 679 # ----- encodestring    encode string with two-byte length
 680 # ----- encodedouble    encode number as eight-byte double precision float
 681 # ----- encodelong              encode number as four-byte long
 682
 683 def encodestring(n)
 684   a,b=n.size.divmod(256)
 685   a.chr+b.chr+n
 686 end
 687
 688 def encodedouble(n)
 689   [n].pack('G')
 690 end
 691
 692 def encodelong(n)
 693   [n].pack('N')
 694 end
 695
 696 # ====================================================================
 697 # Co-ordinate conversion
 698
 699 def lat2coord(a,basey,masterscale)
 700   -(lat2y(a)-basey)*masterscale+250
 701 end
 702
 703 def long2coord(a,baselong,masterscale)
 704   (a-baselong)*masterscale+350
 705 end
 706
 707 def lat2y(a)
 708   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 709 end
 710
 711 def coord2lat(a,masterscale,basey)
 712   y2lat((a-250)/-masterscale+basey)
 713 end
 714
 715 def coord2long(a,masterscale,baselong)
 716   (a-350)/masterscale+baselong
 717 end
 718
 719 def y2lat(a)
 720   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 721 end
 722
 723 end