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