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       case message
  37                   when 'getpresets';    results[index]=putdata(index,getpresets)
  38                   when 'whichways';             results[index]=putdata(index,whichways(args))
  39                   when 'getway';                results[index]=putdata(index,getway(args))
  40                   when 'putway';                results[index]=putdata(index,putway(args))
  41                   when 'deleteway';             results[index]=putdata(index,deleteway(args))
  42                   when 'makeway';               results[index]=putdata(index,makeway(args))
  43       end
  44     end
  45
  46     # ------------------
  47     # Write out response
  48
  49     RAILS_DEFAULT_LOGGER.info("  Response: start")
  50     a,b=results.length.divmod(256)
  51         render :content_type => "application/x-amf", :text => proc { |response, output|
  52         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  53                 results.each do |k,v|
  54                   output.write(v)
  55                 end
  56         }
  57     RAILS_DEFAULT_LOGGER.info("  Response: end")
  58
  59   end
  60
  61   private
  62
  63   # ====================================================================
  64   # Remote calls
  65
  66   # ----- getpresets
  67   #           return presets,presetmenus and presetnames arrays
  68
  69   def getpresets
  70     presets={}
  71     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]
  72     presetnames={}; presetnames['point']={}; presetnames['way']={}
  73     presettype=''
  74     presetcategory=''
  75
  76     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  77
  78     #           File.open("config/potlatch/presets.txt") do |file|
  79
  80     # Temporary patch to get around filepath problem
  81     # To remove this patch and make the code nice again:
  82     # 1. uncomment above line
  83     # 2. fix the path in the above line
  84     # 3. delete this here document, and the following line (StringIO....)
  85
  86     txt=<<-EOF
  87 way/road
  88 motorway: highway=motorway,ref=(type road number)
  89 trunk road: highway=trunk,ref=(type road number),name=(type road name)
  90 primary road: highway=primary,ref=(type road number),name=(type road name)
  91 secondary road: highway=secondary,ref=(type road number),name=(type road name)
  92 residential road: highway=residential,name=(type road name)
  93 unclassified road: highway=unclassified,name=(type road name)
  94
  95 way/footway
  96 footpath: highway=footway,foot=yes
  97 bridleway: highway=bridleway,foot=yes,horse=yes,bicycle=yes
  98 byway: highway=byway,foot=yes,horse=yes,bicycle=yes,motorcar=yes
  99 permissive path: highway=footway,foot=permissive
 100
 101 way/cycleway
 102 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 103 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 104 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 105 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 106
 107 way/waterway
 108 canal: waterway=canal,name=(type name here)
 109 navigable river: waterway=river,boat=yes,name=(type name here)
 110 navigable drain: waterway=drain,boat=yes,name=(type name here)
 111 derelict canal: waterway=derelict_canal,name=(type name here)
 112 unnavigable river: waterway=river,boat=no,name=(type name here)
 113 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 114
 115 way/railway
 116 railway: railway=rail
 117 tramway: railway=tram
 118 light railway: railway=light_rail
 119 preserved railway: railway=preserved
 120 disused railway tracks: railway=disused
 121 course of old railway: railway=abandoned
 122
 123 point/road
 124 mini roundabout: highway=mini_roundabout
 125 traffic lights: highway=traffic_signals
 126
 127 point/footway
 128 bridge: highway=bridge
 129 gate: highway=gate
 130 stile: highway=stile
 131 cattle grid: highway=cattle_grid
 132
 133 point/cycleway
 134 gate: highway=gate
 135
 136 point/waterway
 137 lock gate: waterway=lock_gate
 138 weir: waterway=weir
 139 aqueduct: waterway=aqueduct
 140 winding hole: waterway=turning_point
 141 mooring: waterway=mooring
 142
 143 point/railway
 144 station: railway=station
 145 viaduct: railway=viaduct
 146 level crossing: railway=crossing
 147 EOF
 148
 149     StringIO.open(txt) do |file|
 150       file.each_line {|line|
 151         t=line.chomp
 152         if (t=~/(\w+)\/(\w+)/) then
 153           presettype=$1
 154           presetcategory=$2
 155           presetmenus[presettype].push(presetcategory)
 156           presetnames[presettype][presetcategory]=["(no preset)"]
 157         elsif (t=~/^(.+):\s?(.+)$/) then
 158           pre=$1; kv=$2
 159           presetnames[presettype][presetcategory].push(pre)
 160           presets[pre]={}
 161           kv.split(',').each {|a|
 162             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 163           }
 164         end
 165       }
 166     end
 167     return [presets,presetmenus,presetnames]
 168   end
 169
 170   # ----- whichways(left,bottom,right,top)
 171   #               return array of ways in current bounding box
 172   #               at present, instead of using correct (=more complex) SQL to find
 173   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 174
 175   def whichways(args)
 176     xmin = args[0].to_f-0.01
 177     ymin = args[1].to_f-0.01
 178     xmax = args[2].to_f+0.01
 179     ymax = args[3].to_f+0.01
 180
 181     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 182
 183     waylist=WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 184        "  FROM current_way_segments,current_segments,current_nodes,current_ways "+
 185        " WHERE segment_id=current_segments.id "+
 186        "   AND current_segments.visible=1 "+
 187        "   AND node_a=current_nodes.id "+
 188            "   AND current_ways.id=current_way_segments.id "+
 189            "   AND current_ways.visible=1 "+
 190        "   AND (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 191        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+")")
 192
 193        ways = waylist.collect {|a| a.wayid.to_i } # get an array of way id's
 194
 195        pointlist =ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.tags "+
 196        "  FROM current_nodes "+
 197        "  LEFT OUTER JOIN current_segments cs1 ON cs1.node_a=current_nodes.id "+
 198        "  LEFT OUTER JOIN current_segments cs2 ON cs2.node_b=current_nodes.id "+
 199        " WHERE (latitude  BETWEEN "+ymin.to_s+" AND "+ymax.to_s+") "+
 200        "   AND (longitude BETWEEN "+xmin.to_s+" AND "+xmax.to_s+") "+
 201        "   AND cs1.id IS NULL AND cs2.id IS NULL "+
 202        "   AND current_nodes.visible=1")
 203
 204             points = pointlist.collect {|a| [a['id'],tag2array(a['tags'])]      } # get a list of node ids and their tags
 205
 206     return [ways,points]
 207   end
 208
 209   # ----- getway (objectname, way, baselong, basey, masterscale)
 210   #               returns objectname, array of co-ordinates, attributes,
 211   #                               xmin,xmax,ymin,ymax
 212
 213   def getway(args)
 214     objname,wayid,baselong,basey,masterscale=args
 215     wayid = wayid.to_i
 216     points = []
 217     lastid = -1
 218     xmin = ymin = 999999
 219     xmax = ymax = -999999
 220
 221     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 222
 223     readwayquery(wayid).each {|row|
 224       xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 225       xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 226       points << [xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0] if (row['id1'].to_i!=lastid)
 227       lastid = row['id2'].to_i
 228       points << [xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 229       xmin = [xmin,row['long1'].to_f,row['long2'].to_f].min
 230       xmax = [xmax,row['long1'].to_f,row['long2'].to_f].max
 231       ymin = [ymin,row['lat1'].to_f,row['lat2'].to_f].min
 232       ymax = [ymax,row['lat1'].to_f,row['lat2'].to_f].max
 233     }
 234
 235     attributes={}
 236     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 237     attrlist.each {|a| attributes[a['k']]=a['v'] }
 238
 239     [objname,points,attributes,xmin,xmax,ymin,ymax]
 240   end
 241
 242   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 243   #                                     baselong, basey, masterscale)
 244   #                     returns current way ID, new way ID, hash of renumbered nodes,
 245   #                                     xmin,xmax,ymin,ymax
 246
 247   def putway(args)
 248     usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 249     uid=getuserid(usertoken)
 250     return if !uid
 251     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
 252     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
 253     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 254     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 255     originalway=originalway.to_i
 256
 257     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 258
 259     # -- 3.     read original way into memory
 260
 261     xc={}; yc={}; tagc={}; seg={}
 262     if originalway>0
 263       way=originalway
 264       readwayquery(way).each { |row|
 265         id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 266         id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 267         seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 268       }
 269           ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 270     else
 271       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 272     end
 273
 274     # -- 4.     get version by inserting new row into ways
 275
 276     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 277
 278     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 279
 280     xmin = ymin = 999999
 281     xmax = ymax = -999999
 282     insertsql = ''
 283     renumberednodes={}
 284
 285     points.each_index do |i|
 286       xs=coord2long(points[i][0],masterscale,baselong)
 287       ys=coord2lat(points[i][1],masterscale,basey)
 288       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 289       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 290       node=points[i][2].to_i
 291       tagstr=array2tag(points[i][4])
 292           tagstr=tagstr.gsub(/[\000-\037]/,"")
 293       tagsql="'"+sqlescape(tagstr)+"'"
 294
 295       # compare node
 296       if node<0
 297         # new node - create
 298         newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags) VALUES (           #{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 299                         ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{newnode},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 300         points[i][2]=newnode
 301         renumberednodes[node.to_s]=newnode.to_s
 302
 303       elsif xc.has_key?(node)
 304         # old node from original way - update
 305         if (xs!=xc[node] or (ys/0.0000001).round!=(yc[node]/0.0000001).round or tagstr!=tagc[node])
 306           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags) VALUES (#{node},#{ys},#{xs},#{db_now},#{uid},1,#{tagsql})")
 307           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}")
 308         end
 309       else
 310         # old node, created in another way and now added to this way
 311       end
 312
 313     end
 314
 315
 316     # -- 6.i compare segments
 317
 318     numberedsegments={}
 319     seglist=''                          # list of existing segments that we want to keep
 320     for i in (0..(points.length-2))
 321       if (points[i+1][3].to_i==0) then next end
 322       segid=points[i+1][5].to_i
 323       from =points[i  ][2].to_i
 324       to   =points[i+1][2].to_i
 325       if seg.has_key?(segid)
 326                 # if segment exists, check it still refers to the same nodes
 327         if seg[segid]=="#{from}-#{to}" then
 328           if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 329           next
 330         end
 331           elsif segid>0
 332                 # not in previous version of way, but supplied, so assume
 333                 # that it's come from makeway (i.e. unwayed segments)
 334                 if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 335                 next
 336       end
 337       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,'')")
 338                 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,'')")
 339       points[i+1][5]=segid
 340       numberedsegments[(i+1).to_s]=segid.to_s
 341     end
 342
 343
 344     # -- 6.ii insert new way segments
 345
 346     createuniquesegments(way,db_uqs,seglist)    # segments which appear in this way but no other
 347
 348     #           delete segments from uniquesegments (and not in modified way)
 349
 350     sql=<<-EOF
 351       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 352       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 353         FROM current_segments AS cs, #{db_uqs} AS us
 354        WHERE cs.id=us.segment_id AND cs.visible=1
 355     EOF
 356     ActiveRecord::Base.connection.insert(sql)
 357
 358     sql=<<-EOF
 359          UPDATE current_segments AS cs, #{db_uqs} AS us
 360           SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 361         WHERE cs.id=us.segment_id AND cs.visible=1
 362     EOF
 363     ActiveRecord::Base.connection.update(sql)
 364
 365     #           delete nodes not in modified way or any other segments
 366
 367     createuniquenodes(db_uqs,db_uqn)    # nodes which appear in this way but no other
 368
 369     sql=<<-EOF
 370                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 371                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 372                   FROM current_nodes AS cn,#{db_uqn}
 373                  WHERE cn.id=node_id
 374     EOF
 375     ActiveRecord::Base.connection.insert(sql)
 376
 377     sql=<<-EOF
 378       UPDATE current_nodes AS cn, #{db_uqn}
 379          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 380        WHERE cn.id=node_id
 381     EOF
 382     ActiveRecord::Base.connection.update(sql)
 383
 384     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 385     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 386
 387     #           insert new version of route into way_segments
 388
 389     insertsql =''
 390     currentsql=''
 391     sequence  =1
 392     for i in (0..(points.length-2))
 393       if (points[i+1][3].to_i==0) then next end
 394       if insertsql !='' then insertsql +=',' end
 395       if currentsql!='' then currentsql+=',' end
 396       insertsql +="(#{way},#{points[i+1][5]},#{version})"
 397       currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 398       sequence  +=1
 399     end
 400
 401     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 402     ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 403     ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 404
 405     # -- 7. insert new way tags
 406
 407     insertsql =''
 408     currentsql=''
 409     attributes.each do |k,v|
 410       if v=='' or v.nil? then next end
 411       if v[0,6]=='(type ' then next end
 412       if insertsql !='' then insertsql +=',' end
 413       if currentsql!='' then currentsql+=',' end
 414           k=k.gsub(/[\000-\037]/,"")
 415           v=v.gsub(/[\000-\037]/,"")
 416       insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})"
 417       currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 418     end
 419
 420     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 421     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 422     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 423
 424     [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 425   end
 426
 427   # -----       deleteway (user token, way)
 428   #                     returns way ID only
 429
 430   def deleteway(args)
 431     usertoken,way=args
 432
 433     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 434
 435     uid=getuserid(usertoken); if !uid then return end
 436         way=way.to_i
 437
 438         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
 439         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
 440         db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s     # 'now' variable name, typically 51 chars
 441         ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 442         createuniquesegments(way,db_uqs,'')
 443
 444         # -     delete any otherwise unused segments
 445
 446         sql=<<-EOF
 447       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 448       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 449         FROM current_segments AS cs, #{db_uqs} AS us
 450        WHERE cs.id=us.segment_id
 451     EOF
 452         ActiveRecord::Base.connection.insert(sql)
 453
 454         sql=<<-EOF
 455       UPDATE current_segments AS cs, #{db_uqs} AS us
 456          SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 457        WHERE cs.id=us.segment_id
 458     EOF
 459         ActiveRecord::Base.connection.update(sql)
 460
 461         # - delete any unused nodes
 462
 463     createuniquenodes(db_uqs,db_uqn)
 464
 465         sql=<<-EOF
 466                 INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible)
 467                 SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0
 468                   FROM current_nodes AS cn,#{db_uqn}
 469                  WHERE cn.id=node_id
 470     EOF
 471         ActiveRecord::Base.connection.insert(sql)
 472
 473         sql=<<-EOF
 474       UPDATE current_nodes AS cn, #{db_uqn}
 475          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 476        WHERE cn.id=node_id
 477     EOF
 478         ActiveRecord::Base.connection.update(sql)
 479
 480         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 481         ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 482
 483         # - delete way
 484
 485         ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 486         ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 487         ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 488         ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 489
 490         way
 491 end
 492
 493 # ----- makeway(x,y,baselong,basey,masterscale)
 494 #               returns way made from unwayed segments
 495
 496 def makeway(args)
 497         usertoken,x,y,baselong,basey,masterscale=args
 498     uid=getuserid(usertoken)
 499     return if !uid
 500
 501         points=[]
 502         toreverse=[]                            # segments to reverse
 503         nodesused={}                            # so we don't go over the same node twice
 504
 505         # - find start point near x
 506
 507         xc=coord2long(x,masterscale,baselong)
 508         yc=coord2lat(y,masterscale,basey)
 509
 510         RAILS_DEFAULT_LOGGER.info("  Message: makeway, xc=#{xc}, y=#{yc}")
 511
 512         xs1=xc-0.001; xs2=xc+0.001
 513         ys1=yc-0.001; ys2=yc+0.001
 514
 515         sql=<<-EOF
 516                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 517                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 518                   FROM current_nodes AS cn1,
 519                        current_nodes AS cn2,
 520                        current_segments AS cs
 521                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 522                  WHERE (cn1.longitude BETWEEN #{xs1} AND #{xs2})
 523                    AND (cn1.latitude  BETWEEN #{ys1} AND #{ys2})
 524                    AND segment_id IS NULL
 525                    AND cs.visible=1
 526                    AND cn1.id=node_a AND cn1.visible=1
 527                    AND cn2.id=node_b AND cn2.visible=1
 528               ORDER BY SQRT(POW(cn1.longitude-#{xc},2)+
 529                                 POW(cn1.latitude -#{yc},2))
 530          LIMIT 1
 531         EOF
 532         row=ActiveRecord::Base.connection.select_one sql
 533         if row.nil? then return [0,0,0,0,0] end
 534         xs1=long2coord(row['lon1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 535         xs2=long2coord(row['lon2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 536         xmin=[xs1,xs2].min; xmax=[xs1,xs2].max
 537         ymin=[ys1,ys2].min; ymax=[ys1,ys2].max
 538         nodesused[row['id1'].to_i]=true
 539         nodesused[row['id2'].to_i]=true
 540         points<<[xs1,ys1,row['id1'].to_i,1,{},0]
 541         points<<[xs2,ys2,row['id2'].to_i,1,{},row['segid'].to_i]
 542
 543         # - extend at start, then end
 544         while (a,point,nodesused,toreverse=findconnect(points[0][2],nodesused,'b',toreverse,baselong,basey,masterscale))[0]
 545                 points[0][5]=point[5]; point[5]=0       # segment leads to next node
 546                 points.unshift(point)
 547                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 548                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 549         end
 550         while (a,point,nodesused,toreverse=findconnect(points[-1][2],nodesused,'a',toreverse,baselong,basey,masterscale))[0]
 551                 points.push(point)
 552                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 553                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 554         end
 555         points[0][3]=0  # start with a move
 556
 557         # reverse segments in toreverse
 558         if toreverse.length>0
 559                 sql=<<-EOF
 560                         UPDATE current_segments c1, current_segments c2
 561                            SET c1.node_a=c2.node_b,c1.node_b=c2.node_a,
 562                                c1.timestamp=NOW(),c1.user_id=#{uid}
 563                          WHERE c1.id=c2.id
 564                            AND c1.id IN (#{toreverse.join(',')})
 565                 EOF
 566                 ActiveRecord::Base.connection.update sql
 567                 sql=<<-EOF
 568                         INSERT INTO segments
 569                    (SELECT * FROM current_segments
 570                      WHERE id IN (#{toreverse.join(',')}))
 571                 EOF
 572                 ActiveRecord::Base.connection.insert sql
 573         end
 574
 575         [points,xmin,xmax,ymin,ymax]
 576 end
 577
 578 def findconnect(id,nodesused,lookfor,toreverse,baselong,basey,masterscale)
 579         # get all segments with 'id' as a point
 580         # (to look for both node_a and node_b, UNION is faster than node_a=id OR node_b=id)!
 581         sql=<<-EOF
 582                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 583                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 584                   FROM current_nodes AS cn1,
 585                        current_nodes AS cn2,
 586                        current_segments AS cs
 587                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 588                  WHERE segment_id IS NULL
 589                    AND cs.visible=1
 590                    AND cn1.id=node_a AND cn1.visible=1
 591                    AND cn2.id=node_b AND cn2.visible=1
 592                    AND node_a=#{id}
 593         UNION
 594                 SELECT cn1.latitude AS lat1,cn1.longitude AS lon1,cn1.id AS id1,
 595                        cn2.latitude AS lat2,cn2.longitude AS lon2,cn2.id AS id2, cs.id AS segid
 596                   FROM current_nodes AS cn1,
 597                        current_nodes AS cn2,
 598                        current_segments AS cs
 599                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 600                  WHERE segment_id IS NULL
 601                    AND cs.visible=1
 602                    AND cn1.id=node_a AND cn1.visible=1
 603                    AND cn2.id=node_b AND cn2.visible=1
 604                    AND node_b=#{id}
 605         EOF
 606         connectlist=ActiveRecord::Base.connection.select_all sql
 607
 608         if lookfor=='b' then tocol='id1'; tolat='lat1'; tolon='lon1'; fromcol='id2'; fromlat='lat2'; fromlon='lon2'
 609                                         else tocol='id2'; tolat='lat2'; tolon='lon2'; fromcol='id1'; fromlat='lat1'; fromlon='lon1'
 610         end
 611
 612         # eliminate those already in the hash
 613         connex=0
 614         point=nil
 615         connectlist.each { |row|
 616                 tonode=row[tocol].to_i
 617                 fromnode=row[fromcol].to_i
 618                 if id==tonode and !nodesused.has_key?(fromnode)
 619                         # wrong way round; add, then add to 'segments to reverse' list
 620                         connex+=1
 621                         nodesused[fromnode]=true
 622                         point=[long2coord(row[fromlon].to_f,baselong,masterscale),lat2coord(row[fromlat].to_f,basey,masterscale),fromnode,1,{},row['segid'].to_i]
 623                         toreverse.push(row['segid'].to_i)
 624                 elsif id==fromnode and !nodesused.has_key?(tonode)
 625                         # right way round; just add
 626                         connex+=1
 627                         point=[long2coord(row[tolon].to_f,baselong,masterscale),lat2coord(row[tolat].to_f,basey,masterscale),tonode,1,{},row['segid'].to_i]
 628                         nodesused[tonode]=true
 629                 end
 630         }
 631
 632         # if only one left, then add it; otherwise return false
 633         if connex!=1 or point.nil? then
 634                 return [false,[],nodesused,toreverse]
 635         else
 636                 return [true,point,nodesused,toreverse]
 637         end
 638 end
 639
 640
 641 # ====================================================================
 642 # Support functions for remote calls
 643
 644 def readwayquery(id)
 645   ActiveRecord::Base.connection.select_all "SELECT n1.latitude AS lat1,n1.longitude AS long1,n1.id AS id1,n1.tags as tags1, "+
 646       "           n2.latitude AS lat2,n2.longitude AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 647       "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 648       "   WHERE current_way_segments.id=#{id} "+
 649       "     AND segment_id=current_segments.id "+
 650           "     AND current_segments.visible=1 "+
 651       "     AND n1.id=node_a and n2.id=node_b "+
 652       "     AND n1.visible=1 AND n2.visible=1 "+
 653       "   ORDER BY sequence_id"
 654 end
 655
 656 def createuniquesegments(way,uqs_name,seglist)
 657   # Finds segments which appear in (previous version of) this way and no other
 658   sql=<<-EOF
 659       CREATE TEMPORARY TABLE #{uqs_name}
 660               SELECT a.segment_id
 661                 FROM (SELECT DISTINCT segment_id FROM current_way_segments
 662                   WHERE id = #{way}) a
 663              LEFT JOIN current_way_segments b
 664                 ON b.segment_id = a.segment_id
 665                  AND b.id != #{way}
 666                WHERE b.segment_id IS NULL
 667     EOF
 668   if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end
 669   ActiveRecord::Base.connection.execute(sql)
 670 end
 671
 672 def createuniquenodes(uqs_name,uqn_name)
 673         # Finds nodes which appear in uniquesegments but no other segments
 674         sql=<<-EOF
 675                 CREATE TEMPORARY TABLE #{uqn_name}
 676                            SELECT DISTINCT node_id
 677                               FROM (SELECT cn.id AS node_id
 678                                                   FROM current_nodes AS cn,
 679                                                        current_segments AS cs,
 680                                                        #{uqs_name} AS us
 681                                                  WHERE cs.id=us.segment_id
 682                                                    AND (cn.id=cs.node_a OR cn.id=cs.node_b)) AS n
 683                                          LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 684                                          LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 685                                              WHERE cs2.node_a IS NULL
 686                                                AND cs3.node_b IS NULL
 687         EOF
 688         ActiveRecord::Base.connection.execute(sql)
 689 end
 690
 691 def sqlescape(a)
 692   a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 693 end
 694
 695 def tag2array(a)
 696   tags={}
 697   a.gsub(';;;','#%').split(';').each do |b|
 698     b.gsub!('#%',';;;')
 699     b.gsub!('===','#%')
 700     k,v=b.split('=')
 701     if k.nil? then k='' end
 702     if v.nil? then v='' end
 703     tags[k.gsub('#%','=')]=v.gsub('#%','=')
 704   end
 705   tags
 706 end
 707
 708 def array2tag(a)
 709   str=''
 710   a.each do |k,v|
 711     if v=='' then next end
 712     if v[0,6]=='(type ' then next end
 713     if str!='' then str+=';' end
 714     str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 715   end
 716   str
 717 end
 718
 719 def getuserid(token)
 720   token=sqlescape(token)
 721   if (token=~/^(.+)\+(.+)$/) then
 722     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND email='#{$1}' AND pass_crypt=MD5('#{$2}')")
 723   else
 724     return ActiveRecord::Base.connection.select_value("SELECT id FROM users WHERE active=1 AND token='#{token}'")
 725   end
 726 end
 727
 728
 729
 730 # ====================================================================
 731 # AMF read subroutines
 732
 733 # ----- getint          return two-byte integer
 734 # ----- getlong         return four-byte long
 735 # ----- getstring       return string with two-byte length
 736 # ----- getdouble       return eight-byte double-precision float
 737 # ----- getobject       return object/hash
 738 # ----- getarray        return numeric array
 739
 740 def getint(s)
 741   s.getc*256+s.getc
 742 end
 743
 744 def getlong(s)
 745   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 746 end
 747
 748 def getstring(s)
 749   len=s.getc*256+s.getc
 750   s.read(len)
 751 end
 752
 753 def getdouble(s)
 754   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 755   a[0]
 756 end
 757
 758 def getarray(s)
 759   len=getlong(s)
 760   arr=[]
 761   for i in (0..len-1)
 762     arr[i]=getvalue(s)
 763   end
 764   arr
 765 end
 766
 767 def getobject(s)
 768   arr={}
 769   while (key=getstring(s))
 770     if (key=='') then break end
 771     arr[key]=getvalue(s)
 772   end
 773   s.getc                # skip the 9 'end of object' value
 774   arr
 775 end
 776
 777 # ----- getvalue        parse and get value
 778
 779 def getvalue(s)
 780   case s.getc
 781   when 0;       return getdouble(s)                     # number
 782   when 1;       return s.getc                           # boolean
 783   when 2;       return getstring(s)                     # string
 784   when 3;       return getobject(s)                     # object/hash
 785   when 5;       return nil                                      # null
 786   when 6;       return nil                                      # undefined
 787   when 8;       s.read(4)                                       # mixedArray
 788                     return getobject(s)                 #  |
 789   when 10;      return getarray(s)                      # array
 790   else;         return nil                                      # error
 791   end
 792 end
 793
 794 # ====================================================================
 795 # AMF write subroutines
 796
 797 # ----- putdata         envelope data into AMF writeable form
 798 # ----- encodevalue     pack variables as AMF
 799
 800 def putdata(index,n)
 801   d =encodestring(index+"/onResult")
 802   d+=encodestring("null")
 803   d+=[-1].pack("N")
 804   d+=encodevalue(n)
 805 end
 806
 807 def encodevalue(n)
 808   case n.class.to_s
 809   when 'Array'
 810     a=10.chr+encodelong(n.length)
 811     n.each do |b|
 812       a+=encodevalue(b)
 813     end
 814     a
 815   when 'Hash'
 816     a=3.chr
 817     n.each do |k,v|
 818       a+=encodestring(k)+encodevalue(v)
 819     end
 820     a+0.chr+0.chr+9.chr
 821   when 'String'
 822     2.chr+encodestring(n)
 823   when 'Bignum','Fixnum','Float'
 824     0.chr+encodedouble(n)
 825   when 'NilClass'
 826     5.chr
 827   else
 828     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 829   end
 830 end
 831
 832 # ----- encodestring    encode string with two-byte length
 833 # ----- encodedouble    encode number as eight-byte double precision float
 834 # ----- encodelong              encode number as four-byte long
 835
 836 def encodestring(n)
 837   a,b=n.size.divmod(256)
 838   a.chr+b.chr+n
 839 end
 840
 841 def encodedouble(n)
 842   [n].pack('G')
 843 end
 844
 845 def encodelong(n)
 846   [n].pack('N')
 847 end
 848
 849 # ====================================================================
 850 # Co-ordinate conversion
 851
 852 def lat2coord(a,basey,masterscale)
 853   -(lat2y(a)-basey)*masterscale+250
 854 end
 855
 856 def long2coord(a,baselong,masterscale)
 857   (a-baselong)*masterscale+350
 858 end
 859
 860 def lat2y(a)
 861   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 862 end
 863
 864 def coord2lat(a,masterscale,basey)
 865   y2lat((a-250)/-masterscale+basey)
 866 end
 867
 868 def coord2long(a,masterscale,baselong)
 869   (a-350)/masterscale+baselong
 870 end
 871
 872 def y2lat(a)
 873   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 874 end
 875
 876 end