app/controllers/amf_controller.rb

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