app/controllers/amf_controller.rb

   1 class AmfController < ApplicationController
   2   require 'stringio'
   3
   4   session :off
   5   before_filter :check_write_availability
   6
   7   # to log:
   8   # RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
   9
  10   # ====================================================================
  11   # Main AMF handler
  12
  13   # ---- talk   process AMF request
  14
  15   def talk
  16     req=StringIO.new(request.raw_post)  # Get POST data as request
  17     req.read(2)                                                 # Skip version indicator and client ID
  18     results={}                                                  # Results of each body
  19
  20     # -------------
  21     # Parse request
  22
  23     headers=getint(req)                                 # Read number of headers
  24
  25     headers.times do                                # Read each header
  26       name=getstring(req)                               #  |
  27       req.getc                                  #  | skip boolean
  28       value=getvalue(req)                               #  |
  29       header["name"]=value                              #  |
  30     end
  31
  32     bodies=getint(req)                                  # Read number of bodies
  33     bodies.times do                                     # Read each body
  34       message=getstring(req)                    #  | get message name
  35       index=getstring(req)                              #  | get index in response sequence
  36       bytes=getlong(req)                                #  | get total size in bytes
  37       args=getvalue(req)                                #  | get response (probably an array)
  38
  39       case message
  40                   when 'getpresets';    results[index]=putdata(index,getpresets)
  41                   when 'whichways';             results[index]=putdata(index,whichways(args))
  42                   when 'getway';                results[index]=putdata(index,getway(args))
  43                   when 'putway';                results[index]=putdata(index,putway(args))
  44                   when 'deleteway';             results[index]=putdata(index,deleteway(args))
  45                   when 'makeway';               results[index]=putdata(index,makeway(args))
  46                   when 'putpoi';                results[index]=putdata(index,putpoi(args))
  47                   when 'getpoi';                results[index]=putdata(index,getpoi(args))
  48       end
  49     end
  50
  51     # ------------------
  52     # Write out response
  53
  54     RAILS_DEFAULT_LOGGER.info("  Response: start")
  55     a,b=results.length.divmod(256)
  56         render :content_type => "application/x-amf", :text => proc { |response, output|
  57         output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
  58                 results.each do |k,v|
  59                   output.write(v)
  60                 end
  61         }
  62     RAILS_DEFAULT_LOGGER.info("  Response: end")
  63
  64   end
  65
  66   private
  67
  68   # ====================================================================
  69   # Remote calls
  70
  71   # ----- getpresets
  72   #           return presets,presetmenus and presetnames arrays
  73
  74   def getpresets
  75     presets={}
  76     presetmenus={}; presetmenus['point']=[]; presetmenus['way']=[]; presetmenus['POI']=[]
  77     presetnames={}; presetnames['point']={}; presetnames['way']={}; presetnames['POI']={}
  78     presettype=''
  79     presetcategory=''
  80
  81     RAILS_DEFAULT_LOGGER.info("  Message: getpresets")
  82
  83     #           File.open("config/potlatch/presets.txt") do |file|
  84
  85     # Temporary patch to get around filepath problem
  86     # To remove this patch and make the code nice again:
  87     # 1. uncomment above line
  88     # 2. fix the path in the above line
  89     # 3. delete this here document, and the following line (StringIO....)
  90
  91     txt=<<-EOF
  92 way/road
  93 motorway: highway=motorway,ref=(type road number)
  94 trunk road: highway=trunk,ref=(type road number),name=(type road name)
  95 primary road: highway=primary,ref=(type road number),name=(type road name)
  96 secondary road: highway=secondary,ref=(type road number),name=(type road name)
  97 residential road: highway=residential,name=(type road name)
  98 unclassified road: highway=unclassified,name=(type road name)
  99
 100 way/footway
 101 footpath: highway=footway,foot=yes
 102 bridleway: highway=bridleway,foot=yes
 103 byway: highway=unsurfaced,foot=yes
 104 permissive path: highway=footway,foot=permissive
 105
 106 way/cycleway
 107 cycle lane: highway=cycleway,cycleway=lane,ncn_ref=
 108 cycle track: highway=cycleway,cycleway=track,ncn_ref=
 109 cycle lane (NCN): highway=cycleway,cycleway=lane,name=(type name here),ncn_ref=(type route number)
 110 cycle track (NCN): highway=cycleway,cycleway=track,name=(type name here),ncn_ref=(type route number)
 111
 112 way/waterway
 113 canal: waterway=canal,name=(type name here)
 114 navigable river: waterway=river,boat=yes,name=(type name here)
 115 navigable drain: waterway=drain,boat=yes,name=(type name here)
 116 derelict canal: waterway=derelict_canal,name=(type name here)
 117 unnavigable river: waterway=river,boat=no,name=(type name here)
 118 unnavigable drain: waterway=drain,boat=no,name=(type name here)
 119
 120 way/railway
 121 railway: railway=rail
 122 tramway: railway=tram
 123 light railway: railway=light_rail
 124 preserved railway: railway=preserved
 125 disused railway tracks: railway=disused
 126 course of old railway: railway=abandoned
 127
 128 way/natural
 129 lake: landuse=water
 130 forest: landuse=forest
 131
 132 point/road
 133 mini roundabout: highway=mini_roundabout
 134 traffic lights: highway=traffic_signals
 135
 136 point/footway
 137 bridge: highway=bridge
 138 gate: highway=gate
 139 stile: highway=stile
 140 cattle grid: highway=cattle_grid
 141
 142 point/cycleway
 143 gate: highway=gate
 144
 145 point/waterway
 146 lock gate: waterway=lock_gate
 147 weir: waterway=weir
 148 aqueduct: waterway=aqueduct
 149 winding hole: waterway=turning_point
 150 mooring: waterway=mooring
 151
 152 point/railway
 153 station: railway=station
 154 viaduct: railway=viaduct
 155 level crossing: railway=crossing
 156
 157 point/natural
 158 peak: point=peak
 159
 160 POI/road
 161 car park: amenity=parking
 162 petrol station: amenity=fuel
 163
 164 POI/cycleway
 165 bike park: amenity=bicycle_parking
 166
 167 POI/place
 168 city: place=city,name=(type name here),is_in=(type region or county)
 169 town: place=town,name=(type name here),is_in=(type region or county)
 170 suburb: place=suburb,name=(type name here),is_in=(type region or county)
 171 village: place=village,name=(type name here),is_in=(type region or county)
 172 hamlet: place=hamlet,name=(type name here),is_in=(type region or county)
 173
 174 POI/tourism
 175 attraction: tourism=attraction,amenity=,religion=,denomination=
 176 church: tourism=,amenity=place_of_worship,name=(type name here),religion=christian,denomination=(type denomination here)
 177 hotel: tourism=hotel,amenity=,religion=,denomination=
 178 other religious: tourism=,amenity=place_of_worship,name=(type name here),religion=(type religion),denomination=
 179 post box: amenity=post_box,tourism=,name=,religion=,denomination=
 180 post office: amenity=post_office,tourism=,name=,religion=,denomination=
 181 pub: tourism=,amenity=pub,name=(type name here),religion=,denomination=
 182
 183 POI/natural
 184 peak: point=peak
 185 EOF
 186
 187     StringIO.open(txt) do |file|
 188       file.each_line {|line|
 189         t=line.chomp
 190         if (t=~/(\w+)\/(\w+)/) then
 191           presettype=$1
 192           presetcategory=$2
 193           presetmenus[presettype].push(presetcategory)
 194           presetnames[presettype][presetcategory]=["(no preset)"]
 195         elsif (t=~/^(.+):\s?(.+)$/) then
 196           pre=$1; kv=$2
 197           presetnames[presettype][presetcategory].push(pre)
 198           presets[pre]={}
 199           kv.split(',').each {|a|
 200             if (a=~/^(.+)=(.*)$/) then presets[pre][$1]=$2 end
 201           }
 202         end
 203       }
 204     end
 205     return [presets,presetmenus,presetnames]
 206   end
 207
 208   # ----- whichways(left,bottom,right,top)
 209   #               return array of ways in current bounding box
 210   #               at present, instead of using correct (=more complex) SQL to find
 211   #               corner-crossing ways, it simply enlarges the bounding box by +/- 0.01
 212
 213   def whichways(args)
 214     xmin = args[0].to_f-0.01
 215     ymin = args[1].to_f-0.01
 216     xmax = args[2].to_f+0.01
 217     ymax = args[3].to_f+0.01
 218     baselong    = args[4]
 219     basey       = args[5]
 220     masterscale = args[6]
 221
 222     RAILS_DEFAULT_LOGGER.info("  Message: whichways, bbox=#{xmin},#{ymin},#{xmax},#{ymax}")
 223
 224     waylist = WaySegment.find_by_sql("SELECT DISTINCT current_way_segments.id AS wayid"+
 225        "  FROM current_way_segments,current_segments,current_nodes,current_ways "+
 226        " WHERE segment_id=current_segments.id "+
 227        "   AND current_segments.visible=1 "+
 228        "   AND node_a=current_nodes.id "+
 229        "   AND current_ways.id=current_way_segments.id "+
 230        "   AND current_ways.visible=1 "+
 231        "   AND "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes."))
 232
 233     ways = waylist.collect {|a| a.wayid.to_i } # get an array of way id's
 234
 235     pointlist = ActiveRecord::Base.connection.select_all("SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lng,current_nodes.tags "+
 236        "  FROM current_nodes "+
 237        "  LEFT OUTER JOIN current_segments cs1 ON cs1.node_a=current_nodes.id "+
 238        "  LEFT OUTER JOIN current_segments cs2 ON cs2.node_b=current_nodes.id "+
 239        " WHERE "+OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")+
 240        "   AND cs1.id IS NULL AND cs2.id IS NULL "+
 241        "   AND current_nodes.visible=1")
 242
 243     points = pointlist.collect {|a| [a['id'],long2coord(a['lng'].to_f,baselong,masterscale),lat2coord(a['lat'].to_f,basey,masterscale),tag2array(a['tags'])]    } # get a list of node ids and their tags
 244
 245     return [ways,points]
 246   end
 247
 248   # ----- getway (objectname, way, baselong, basey, masterscale)
 249   #               returns objectname, array of co-ordinates, attributes,
 250   #                               xmin,xmax,ymin,ymax
 251
 252   def getway(args)
 253     objname,wayid,baselong,basey,masterscale=args
 254     wayid = wayid.to_i
 255     points = []
 256     lastid = -1
 257     xmin = ymin = 999999
 258     xmax = ymax = -999999
 259
 260     RAILS_DEFAULT_LOGGER.info("  Message: getway, id=#{wayid}")
 261
 262     readwayquery(wayid).each {|row|
 263       xs1=long2coord(row['long1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 264       xs2=long2coord(row['long2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 265       points << [xs1,ys1,row['id1'].to_i,0,tag2array(row['tags1']),0] if (row['id1'].to_i!=lastid)
 266       lastid = row['id2'].to_i
 267       points << [xs2,ys2,row['id2'].to_i,1,tag2array(row['tags2']),row['segment_id'].to_i]
 268       xmin = [xmin,row['long1'].to_f,row['long2'].to_f].min
 269       xmax = [xmax,row['long1'].to_f,row['long2'].to_f].max
 270       ymin = [ymin,row['lat1'].to_f,row['lat2'].to_f].min
 271       ymax = [ymax,row['lat1'].to_f,row['lat2'].to_f].max
 272     }
 273
 274     attributes={}
 275     attrlist=ActiveRecord::Base.connection.select_all "SELECT k,v FROM current_way_tags WHERE id=#{wayid}"
 276     attrlist.each {|a| attributes[a['k']]=a['v'] }
 277
 278     [objname,points,attributes,xmin,xmax,ymin,ymax]
 279   end
 280
 281   # -----       putway (user token, way, array of co-ordinates, array of attributes,
 282   #                                     baselong, basey, masterscale)
 283   #                     returns current way ID, new way ID, hash of renumbered nodes,
 284   #                                     xmin,xmax,ymin,ymax
 285
 286   def putway(args)
 287     usertoken,originalway,points,attributes,baselong,basey,masterscale=args
 288     uid=getuserid(usertoken)
 289     return if !uid
 290     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
 291     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
 292     db_now='@now'+uid.to_s+originalway.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 293     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 294     originalway=originalway.to_i
 295
 296     RAILS_DEFAULT_LOGGER.info("  Message: putway, id=#{originalway}")
 297
 298     # -- 3.     read original way into memory
 299
 300     xc={}; yc={}; tagc={}; seg={}
 301     if originalway>0
 302       way=originalway
 303       readwayquery(way).each { |row|
 304         id1=row['id1'].to_i; xc[id1]=row['long1'].to_f; yc[id1]=row['lat1'].to_f; tagc[id1]=row['tags1']
 305         id2=row['id2'].to_i; xc[id2]=row['long2'].to_f; yc[id2]=row['lat2'].to_f; tagc[id2]=row['tags2']
 306         seg[row['segment_id'].to_i]=id1.to_s+'-'+id2.to_s
 307       }
 308       ActiveRecord::Base.connection.update("UPDATE current_ways SET timestamp=#{db_now},user_id=#{uid},visible=1 WHERE id=#{way}")
 309     else
 310       way=ActiveRecord::Base.connection.insert("INSERT INTO current_ways (user_id,timestamp,visible) VALUES (#{uid},#{db_now},1)")
 311     end
 312
 313     # -- 4.     get version by inserting new row into ways
 314
 315     version=ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},1)")
 316
 317     # -- 5. compare nodes and update xmin,xmax,ymin,ymax
 318
 319     xmin = ymin = 999999
 320     xmax = ymax = -999999
 321     insertsql = ''
 322     renumberednodes={}
 323
 324     points.each_index do |i|
 325       xs=coord2long(points[i][0],masterscale,baselong)
 326       ys=coord2lat(points[i][1],masterscale,basey)
 327       xmin=[xs,xmin].min; xmax=[xs,xmax].max
 328       ymin=[ys,ymin].min; ymax=[ys,ymax].max
 329       node=points[i][2].to_i
 330       tagstr=array2tag(points[i][4])
 331       tagstr=tagstr.gsub(/[\000-\037]/,"")
 332       tagsql="'"+sqlescape(tagstr)+"'"
 333       lat=(ys * 10000000).round
 334       long=(xs * 10000000).round
 335       tile=QuadTile.tile_for_point(ys, xs)
 336
 337       # compare node
 338       if node<0
 339         # new node - create
 340         if renumberednodes[node.to_s].nil?
 341           newnode=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (   latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (           #{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 342                   ActiveRecord::Base.connection.insert("INSERT INTO nodes         (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newnode},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 343           points[i][2]=newnode
 344           renumberednodes[node.to_s]=newnode.to_s
 345         else
 346           points[i][2]=renumberednodes[node.to_s].to_i
 347         end
 348
 349       elsif xc.has_key?(node)
 350         # old node from original way - update
 351         if (xs!=xc[node] or ys!=yc[node] or tagstr!=tagc[node])
 352           ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{node},#{lat},#{long},#{db_now},#{uid},1,#{tagsql},#{tile})")
 353           ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},tags=#{tagsql},visible=1,tile=#{tile} WHERE id=#{node}")
 354         end
 355       else
 356         # old node, created in another way and now added to this way
 357       end
 358     end
 359
 360
 361     # -- 6.i compare segments
 362
 363     numberedsegments={}
 364     seglist=''                          # list of existing segments that we want to keep
 365     for i in (0..(points.length-2))
 366       if (points[i+1][3].to_i==0) then next end
 367       segid=points[i+1][5].to_i
 368       from =points[i  ][2].to_i
 369       to   =points[i+1][2].to_i
 370       if seg.has_key?(segid)
 371         # if segment exists, check it still refers to the same nodes
 372         if seg[segid]=="#{from}-#{to}" then
 373           if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 374           next
 375         end
 376       elsif segid>0
 377         # not in previous version of way, but supplied, so assume
 378         # that it's come from makeway (i.e. unwayed segments)
 379         if (seglist!='') then seglist+=',' end; seglist+=segid.to_s
 380         next
 381       end
 382       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,'')")
 383             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,'')")
 384       points[i+1][5]=segid
 385       numberedsegments[(i+1).to_s]=segid.to_s
 386     end
 387
 388
 389     # -- 6.ii insert new way segments
 390
 391     createuniquesegments(way,db_uqs,seglist)    # segments which appear in this way but no other
 392
 393     #           delete segments from uniquesegments (and not in modified way)
 394
 395     sql=<<-EOF
 396       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 397       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 398         FROM current_segments AS cs, #{db_uqs} AS us
 399        WHERE cs.id=us.segment_id AND cs.visible=1
 400     EOF
 401     ActiveRecord::Base.connection.insert(sql)
 402
 403     sql=<<-EOF
 404          UPDATE current_segments AS cs, #{db_uqs} AS us
 405           SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 406         WHERE cs.id=us.segment_id AND cs.visible=1
 407     EOF
 408     ActiveRecord::Base.connection.update(sql)
 409
 410     #           delete nodes not in modified way or any other segments
 411
 412     createuniquenodes(db_uqs,db_uqn)    # nodes which appear in this way but no other
 413
 414     sql=<<-EOF
 415         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 416         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 417           FROM current_nodes AS cn,#{db_uqn}
 418          WHERE cn.id=node_id
 419     EOF
 420     ActiveRecord::Base.connection.insert(sql)
 421
 422     sql=<<-EOF
 423       UPDATE current_nodes AS cn, #{db_uqn}
 424          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 425        WHERE cn.id=node_id
 426     EOF
 427     ActiveRecord::Base.connection.update(sql)
 428
 429     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 430     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 431
 432     #           insert new version of route into way_segments
 433
 434     insertsql =''
 435     currentsql=''
 436     sequence  =1
 437     for i in (0..(points.length-2))
 438       if (points[i+1][3].to_i==0) then next end
 439       if insertsql !='' then insertsql +=',' end
 440       if currentsql!='' then currentsql+=',' end
 441       insertsql +="(#{way},#{points[i+1][5]},#{version})"
 442       currentsql+="(#{way},#{points[i+1][5]},#{sequence})"
 443       sequence  +=1
 444     end
 445
 446     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}");
 447     ActiveRecord::Base.connection.insert("INSERT INTO         way_segments (id,segment_id,version    ) VALUES #{insertsql}");
 448     ActiveRecord::Base.connection.insert("INSERT INTO current_way_segments (id,segment_id,sequence_id) VALUES #{currentsql}");
 449
 450     # -- 7. insert new way tags
 451
 452     insertsql =''
 453     currentsql=''
 454     attributes.each do |k,v|
 455       if v=='' or v.nil? then next end
 456       if v[0,6]=='(type ' then next end
 457       if insertsql !='' then insertsql +=',' end
 458       if currentsql!='' then currentsql+=',' end
 459           k=k.gsub(/[\000-\037]/,"")
 460           v=v.gsub(/[\000-\037]/,"")
 461       insertsql +="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"',#{version})"
 462       currentsql+="(#{way},'"+sqlescape(k)+"','"+sqlescape(v)+"')"
 463     end
 464
 465     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 466     if (insertsql !='') then ActiveRecord::Base.connection.insert("INSERT INTO way_tags (id,k,v,version) VALUES #{insertsql}" ) end
 467     if (currentsql!='') then ActiveRecord::Base.connection.insert("INSERT INTO current_way_tags (id,k,v) VALUES #{currentsql}") end
 468
 469     [originalway,way,renumberednodes,numberedsegments,xmin,xmax,ymin,ymax]
 470   end
 471
 472   # -----       putpoi (user token, id, x,y,tag array,visible,baselong,basey,masterscale)
 473   #                     returns current id, new id
 474   #                     if new: add new row to current_nodes and nodes
 475   #                     if old: add new row to nodes, update current_nodes
 476
 477   def putpoi(args)
 478     usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
 479     uid=getuserid(usertoken)
 480     return if !uid
 481     db_now='@now'+uid.to_s+id.to_i.abs.to_s+Time.new.to_i.to_s  # 'now' variable name, typically 51 chars
 482     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 483
 484     id=id.to_i
 485     visible=visible.to_i
 486     x=coord2long(x.to_f,masterscale,baselong)
 487     y=coord2lat(y.to_f,masterscale,basey)
 488     tagsql="'"+sqlescape(array2tag(tags))+"'"
 489     lat=(y * 10000000).round
 490     long=(x * 10000000).round
 491     tile=QuadTile.tile_for_point(y, x)
 492
 493     if (id>0) then
 494         ActiveRecord::Base.connection.insert("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{id},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 495         ActiveRecord::Base.connection.update("UPDATE current_nodes SET latitude=#{lat},longitude=#{long},timestamp=#{db_now},user_id=#{uid},visible=#{visible},tags=#{tagsql},tile=#{tile} WHERE id=#{id}");
 496         newid=id
 497     else
 498         newid=ActiveRecord::Base.connection.insert("INSERT INTO current_nodes (latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 499               ActiveRecord::Base.connection.update("INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tags,tile) VALUES (#{newid},#{lat},#{long},#{db_now},#{uid},#{visible},#{tagsql},#{tile})");
 500     end
 501     [id,newid]
 502   end
 503
 504   # -----       getpoi (id,baselong,basey,masterscale)
 505   #                     returns id,x,y,tag array
 506
 507   def getpoi(args)
 508         id,baselong,basey,masterscale=args; id=id.to_i
 509         poi=ActiveRecord::Base.connection.select_one("SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lng,tags "+
 510                 "FROM current_nodes WHERE visible=1 AND id=#{id}")
 511         if poi.nil? then return [nil,nil,nil,''] end
 512         [id,
 513          long2coord(poi['lng'].to_f,baselong,masterscale),
 514          lat2coord(poi['lat'].to_f,basey,masterscale),
 515          tag2array(poi['tags'])]
 516   end
 517
 518   # -----       deleteway (user token, way)
 519   #                     returns way ID only
 520
 521   def deleteway(args)
 522     usertoken,way=args
 523
 524     RAILS_DEFAULT_LOGGER.info("  Message: deleteway, id=#{way}")
 525
 526     uid=getuserid(usertoken); if !uid then return end
 527     way=way.to_i
 528
 529     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
 530     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
 531     db_now='@now'+uid.to_s+way.to_i.abs.to_s+Time.new.to_i.to_s # 'now' variable name, typically 51 chars
 532     ActiveRecord::Base.connection.execute("SET #{db_now}=NOW()")
 533     createuniquesegments(way,db_uqs,'')
 534
 535     # - delete any otherwise unused segments
 536
 537     sql=<<-EOF
 538       INSERT INTO segments (id,node_a,node_b,timestamp,user_id,visible)
 539       SELECT DISTINCT segment_id,node_a,node_b,#{db_now},#{uid},0
 540         FROM current_segments AS cs, #{db_uqs} AS us
 541        WHERE cs.id=us.segment_id
 542     EOF
 543     ActiveRecord::Base.connection.insert(sql)
 544
 545     sql=<<-EOF
 546       UPDATE current_segments AS cs, #{db_uqs} AS us
 547          SET cs.timestamp=#{db_now},cs.visible=0,cs.user_id=#{uid}
 548        WHERE cs.id=us.segment_id
 549     EOF
 550     ActiveRecord::Base.connection.update(sql)
 551
 552     # - delete any unused nodes
 553
 554     createuniquenodes(db_uqs,db_uqn)
 555
 556     sql=<<-EOF
 557         INSERT INTO nodes (id,latitude,longitude,timestamp,user_id,visible,tile)
 558         SELECT DISTINCT cn.id,cn.latitude,cn.longitude,#{db_now},#{uid},0,cn.tile
 559           FROM current_nodes AS cn,#{db_uqn}
 560          WHERE cn.id=node_id
 561     EOF
 562     ActiveRecord::Base.connection.insert(sql)
 563
 564     sql=<<-EOF
 565       UPDATE current_nodes AS cn, #{db_uqn}
 566          SET cn.timestamp=#{db_now},cn.visible=0,cn.user_id=#{uid}
 567        WHERE cn.id=node_id
 568     EOF
 569     ActiveRecord::Base.connection.update(sql)
 570
 571     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqs}")
 572     ActiveRecord::Base.connection.execute("DROP TABLE #{db_uqn}")
 573
 574     # - delete way
 575
 576     ActiveRecord::Base.connection.insert("INSERT INTO ways (id,user_id,timestamp,visible) VALUES (#{way},#{uid},#{db_now},0)")
 577     ActiveRecord::Base.connection.update("UPDATE current_ways SET user_id=#{uid},timestamp=#{db_now},visible=0 WHERE id=#{way}")
 578     ActiveRecord::Base.connection.execute("DELETE FROM current_way_segments WHERE id=#{way}")
 579     ActiveRecord::Base.connection.execute("DELETE FROM current_way_tags WHERE id=#{way}")
 580
 581     way
 582 end
 583
 584 # ----- makeway(x,y,baselong,basey,masterscale)
 585 #               returns way made from unwayed segments
 586
 587 def makeway(args)
 588         usertoken,x,y,baselong,basey,masterscale=args
 589     uid=getuserid(usertoken)
 590     return if !uid
 591
 592         points=[]
 593         toreverse=[]                            # segments to reverse
 594         nodesused={}                            # so we don't go over the same node twice
 595
 596         # - find start point near x
 597
 598         xc=coord2long(x,masterscale,baselong)
 599         yc=coord2lat(y,masterscale,basey)
 600
 601         RAILS_DEFAULT_LOGGER.info("  Message: makeway, xc=#{xc}, y=#{yc}")
 602
 603         xs1=xc-0.001; xs2=xc+0.001
 604         ys1=yc-0.001; ys2=yc+0.001
 605
 606         sql=<<-EOF
 607                 SELECT cn1.latitude*0.0000001 AS lat1,cn1.longitude*0.0000001 AS lon1,cn1.id AS id1,
 608                        cn2.latitude*0.0000001 AS lat2,cn2.longitude*0.0000001 AS lon2,cn2.id AS id2, cs.id AS segid
 609                   FROM current_nodes AS cn1,
 610                        current_nodes AS cn2,
 611                        current_segments AS cs
 612                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 613                  WHERE (cn1.longitude BETWEEN #{xs1} AND #{xs2})
 614                    AND (cn1.latitude  BETWEEN #{ys1} AND #{ys2})
 615                    AND segment_id IS NULL
 616                    AND cs.visible=1
 617                    AND cn1.id=node_a AND cn1.visible=1
 618                    AND cn2.id=node_b AND cn2.visible=1
 619               ORDER BY SQRT(POW(cn1.longitude-#{xc},2)+
 620                                 POW(cn1.latitude -#{yc},2))
 621          LIMIT 1
 622         EOF
 623         row=ActiveRecord::Base.connection.select_one sql
 624         if row.nil? then return [0,0,0,0,0] end
 625         xs1=long2coord(row['lon1'].to_f,baselong,masterscale); ys1=lat2coord(row['lat1'].to_f,basey,masterscale)
 626         xs2=long2coord(row['lon2'].to_f,baselong,masterscale); ys2=lat2coord(row['lat2'].to_f,basey,masterscale)
 627         xmin=[xs1,xs2].min; xmax=[xs1,xs2].max
 628         ymin=[ys1,ys2].min; ymax=[ys1,ys2].max
 629         nodesused[row['id1'].to_i]=true
 630         nodesused[row['id2'].to_i]=true
 631         points<<[xs1,ys1,row['id1'].to_i,1,{},0]
 632         points<<[xs2,ys2,row['id2'].to_i,1,{},row['segid'].to_i]
 633
 634         # - extend at start, then end
 635         while (a,point,nodesused,toreverse=findconnect(points[0][2],nodesused,'b',toreverse,baselong,basey,masterscale))[0]
 636                 points[0][5]=point[5]; point[5]=0       # segment leads to next node
 637                 points.unshift(point)
 638                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 639                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 640         end
 641         while (a,point,nodesused,toreverse=findconnect(points[-1][2],nodesused,'a',toreverse,baselong,basey,masterscale))[0]
 642                 points.push(point)
 643                 xmin=[point[0],xmin].min; xmax=[point[0],xmax].max
 644                 ymin=[point[1],ymin].min; ymax=[point[1],ymax].max
 645         end
 646         points[0][3]=0  # start with a move
 647
 648         # reverse segments in toreverse
 649         if toreverse.length>0
 650                 sql=<<-EOF
 651                         UPDATE current_segments c1, current_segments c2
 652                            SET c1.node_a=c2.node_b,c1.node_b=c2.node_a,
 653                                c1.timestamp=NOW(),c1.user_id=#{uid}
 654                          WHERE c1.id=c2.id
 655                            AND c1.id IN (#{toreverse.join(',')})
 656                 EOF
 657                 ActiveRecord::Base.connection.update sql
 658                 sql=<<-EOF
 659                         INSERT INTO segments
 660                    (SELECT * FROM current_segments
 661                      WHERE id IN (#{toreverse.join(',')}))
 662                 EOF
 663                 ActiveRecord::Base.connection.insert sql
 664         end
 665
 666         [points,xmin,xmax,ymin,ymax]
 667 end
 668
 669 def findconnect(id,nodesused,lookfor,toreverse,baselong,basey,masterscale)
 670         # get all segments with 'id' as a point
 671         # (to look for both node_a and node_b, UNION is faster than node_a=id OR node_b=id)!
 672         sql=<<-EOF
 673                 SELECT cn1.latitude*0.0000001 AS lat1,cn1.longitude*0.0000001 AS lon1,cn1.id AS id1,
 674                        cn2.latitude*0.0000001 AS lat2,cn2.longitude*0.0000001 AS lon2,cn2.id AS id2, cs.id AS segid
 675                   FROM current_nodes AS cn1,
 676                        current_nodes AS cn2,
 677                        current_segments AS cs
 678                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 679                  WHERE segment_id IS NULL
 680                    AND cs.visible=1
 681                    AND cn1.id=node_a AND cn1.visible=1
 682                    AND cn2.id=node_b AND cn2.visible=1
 683                    AND node_a=#{id}
 684         UNION
 685                 SELECT cn1.latitude*0.0000001 AS lat1,cn1.longitude*0.0000001 AS lon1,cn1.id AS id1,
 686                        cn2.latitude*0.0000001 AS lat2,cn2.longitude*0.0000001 AS lon2,cn2.id AS id2, cs.id AS segid
 687                   FROM current_nodes AS cn1,
 688                        current_nodes AS cn2,
 689                        current_segments AS cs
 690                        LEFT OUTER JOIN current_way_segments ON segment_id=cs.id
 691                  WHERE segment_id IS NULL
 692                    AND cs.visible=1
 693                    AND cn1.id=node_a AND cn1.visible=1
 694                    AND cn2.id=node_b AND cn2.visible=1
 695                    AND node_b=#{id}
 696         EOF
 697         connectlist=ActiveRecord::Base.connection.select_all sql
 698
 699         if lookfor=='b' then tocol='id1'; tolat='lat1'; tolon='lon1'; fromcol='id2'; fromlat='lat2'; fromlon='lon2'
 700                                         else tocol='id2'; tolat='lat2'; tolon='lon2'; fromcol='id1'; fromlat='lat1'; fromlon='lon1'
 701         end
 702
 703         # eliminate those already in the hash
 704         connex=0
 705         point=nil
 706         connectlist.each { |row|
 707                 tonode=row[tocol].to_i
 708                 fromnode=row[fromcol].to_i
 709                 if id==tonode and !nodesused.has_key?(fromnode)
 710                         # wrong way round; add, then add to 'segments to reverse' list
 711                         connex+=1
 712                         nodesused[fromnode]=true
 713                         point=[long2coord(row[fromlon].to_f,baselong,masterscale),lat2coord(row[fromlat].to_f,basey,masterscale),fromnode,1,{},row['segid'].to_i]
 714                         toreverse.push(row['segid'].to_i)
 715                 elsif id==fromnode and !nodesused.has_key?(tonode)
 716                         # right way round; just add
 717                         connex+=1
 718                         point=[long2coord(row[tolon].to_f,baselong,masterscale),lat2coord(row[tolat].to_f,basey,masterscale),tonode,1,{},row['segid'].to_i]
 719                         nodesused[tonode]=true
 720                 end
 721         }
 722
 723         # if only one left, then add it; otherwise return false
 724         if connex!=1 or point.nil? then
 725                 return [false,[],nodesused,toreverse]
 726         else
 727                 return [true,point,nodesused,toreverse]
 728         end
 729 end
 730
 731
 732 # ====================================================================
 733 # Support functions for remote calls
 734
 735 def readwayquery(id)
 736   ActiveRecord::Base.connection.select_all "SELECT n1.latitude*0.0000001 AS lat1,n1.longitude*0.0000001 AS long1,n1.id AS id1,n1.tags as tags1, "+
 737       "           n2.latitude*0.0000001 AS lat2,n2.longitude*0.0000001 AS long2,n2.id AS id2,n2.tags as tags2,segment_id "+
 738       "    FROM current_way_segments,current_segments,current_nodes AS n1,current_nodes AS n2 "+
 739       "   WHERE current_way_segments.id=#{id} "+
 740       "     AND segment_id=current_segments.id "+
 741       "     AND current_segments.visible=1 "+
 742       "     AND n1.id=node_a AND n2.id=node_b "+
 743       "     AND n1.visible=1 AND n2.visible=1 "+
 744       "   ORDER BY sequence_id"
 745 end
 746
 747 def createuniquesegments(way,uqs_name,seglist)
 748   # Finds segments which appear in (previous version of) this way and no other
 749   sql=<<-EOF
 750       CREATE TEMPORARY TABLE #{uqs_name}
 751               SELECT a.segment_id
 752                 FROM (SELECT DISTINCT segment_id FROM current_way_segments
 753                   WHERE id = #{way}) a
 754              LEFT JOIN current_way_segments b
 755                 ON b.segment_id = a.segment_id
 756                  AND b.id != #{way}
 757                WHERE b.segment_id IS NULL
 758     EOF
 759   if (seglist!='') then sql+=" AND a.segment_id NOT IN (#{seglist})" end
 760   ActiveRecord::Base.connection.execute(sql)
 761 end
 762
 763 def createuniquenodes(uqs_name,uqn_name)
 764         # Finds nodes which appear in uniquesegments but no other segments
 765         sql=<<-EOF
 766         CREATE TEMPORARY TABLE #{uqn_name}
 767            SELECT DISTINCT node_id
 768            FROM (SELECT cn.id AS node_id
 769                  FROM current_nodes AS cn,
 770                       current_segments AS cs,
 771                       #{uqs_name} AS us
 772                  WHERE cs.id=us.segment_id
 773                    AND cn.id=cs.node_a) AS n
 774            LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 775            LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 776            WHERE cs2.node_a IS NULL
 777              AND cs3.node_b IS NULL
 778         EOF
 779         ActiveRecord::Base.connection.execute(sql)
 780         sql=<<-EOF
 781         INSERT INTO #{uqn_name}
 782            SELECT DISTINCT node_id
 783            FROM (SELECT cn.id AS node_id
 784                  FROM current_nodes AS cn,
 785                       current_segments AS cs,
 786                       #{uqs_name} AS us
 787                  WHERE cs.id=us.segment_id
 788                    AND cn.id=cs.node_b) AS n
 789            LEFT JOIN current_segments AS cs2 ON node_id=cs2.node_a AND cs2.visible=1
 790            LEFT JOIN current_segments AS cs3 ON node_id=cs3.node_b AND cs3.visible=1
 791            WHERE cs2.node_a IS NULL
 792              AND cs3.node_b IS NULL
 793         EOF
 794         ActiveRecord::Base.connection.execute(sql)
 795 end
 796
 797 def sqlescape(a)
 798   a.gsub("'","''").gsub(92.chr,92.chr+92.chr)
 799 end
 800
 801 def tag2array(a)
 802   tags={}
 803   a.gsub(';;;','#%').split(';').each do |b|
 804     b.gsub!('#%',';;;')
 805     b.gsub!('===','#%')
 806     k,v=b.split('=')
 807     if k.nil? then k='' end
 808     if v.nil? then v='' end
 809     tags[k.gsub('#%','=')]=v.gsub('#%','=')
 810   end
 811   tags
 812 end
 813
 814 def array2tag(a)
 815   str=''
 816   a.each do |k,v|
 817     if v=='' then next end
 818     if v[0,6]=='(type ' then next end
 819     if str!='' then str+=';' end
 820     str+=k.gsub(';',';;;').gsub('=','===')+'='+v.gsub(';',';;;').gsub('=','===')
 821   end
 822   str
 823 end
 824
 825 def getuserid(token)
 826   if (token =~ /^(.+)\+(.+)$/) then
 827     user = User.authenticate(:username => $1, :password => $2)
 828   else
 829     user = User.authenticate(:token => token)
 830   end
 831
 832   return user ? user.id : nil;
 833 end
 834
 835
 836
 837 # ====================================================================
 838 # AMF read subroutines
 839
 840 # ----- getint          return two-byte integer
 841 # ----- getlong         return four-byte long
 842 # ----- getstring       return string with two-byte length
 843 # ----- getdouble       return eight-byte double-precision float
 844 # ----- getobject       return object/hash
 845 # ----- getarray        return numeric array
 846
 847 def getint(s)
 848   s.getc*256+s.getc
 849 end
 850
 851 def getlong(s)
 852   ((s.getc*256+s.getc)*256+s.getc)*256+s.getc
 853 end
 854
 855 def getstring(s)
 856   len=s.getc*256+s.getc
 857   s.read(len)
 858 end
 859
 860 def getdouble(s)
 861   a=s.read(8).unpack('G')                       # G big-endian, E little-endian
 862   a[0]
 863 end
 864
 865 def getarray(s)
 866   len=getlong(s)
 867   arr=[]
 868   for i in (0..len-1)
 869     arr[i]=getvalue(s)
 870   end
 871   arr
 872 end
 873
 874 def getobject(s)
 875   arr={}
 876   while (key=getstring(s))
 877     if (key=='') then break end
 878     arr[key]=getvalue(s)
 879   end
 880   s.getc                # skip the 9 'end of object' value
 881   arr
 882 end
 883
 884 # ----- getvalue        parse and get value
 885
 886 def getvalue(s)
 887   case s.getc
 888   when 0;       return getdouble(s)                     # number
 889   when 1;       return s.getc                           # boolean
 890   when 2;       return getstring(s)                     # string
 891   when 3;       return getobject(s)                     # object/hash
 892   when 5;       return nil                                      # null
 893   when 6;       return nil                                      # undefined
 894   when 8;       s.read(4)                                       # mixedArray
 895                     return getobject(s)                 #  |
 896   when 10;      return getarray(s)                      # array
 897   else;         return nil                                      # error
 898   end
 899 end
 900
 901 # ====================================================================
 902 # AMF write subroutines
 903
 904 # ----- putdata         envelope data into AMF writeable form
 905 # ----- encodevalue     pack variables as AMF
 906
 907 def putdata(index,n)
 908   d =encodestring(index+"/onResult")
 909   d+=encodestring("null")
 910   d+=[-1].pack("N")
 911   d+=encodevalue(n)
 912 end
 913
 914 def encodevalue(n)
 915   case n.class.to_s
 916   when 'Array'
 917     a=10.chr+encodelong(n.length)
 918     n.each do |b|
 919       a+=encodevalue(b)
 920     end
 921     a
 922   when 'Hash'
 923     a=3.chr
 924     n.each do |k,v|
 925       a+=encodestring(k)+encodevalue(v)
 926     end
 927     a+0.chr+0.chr+9.chr
 928   when 'String'
 929     2.chr+encodestring(n)
 930   when 'Bignum','Fixnum','Float'
 931     0.chr+encodedouble(n)
 932   when 'NilClass'
 933     5.chr
 934   else
 935     RAILS_DEFAULT_LOGGER.error("Unexpected Ruby type for AMF conversion: "+n.class.to_s)
 936   end
 937 end
 938
 939 # ----- encodestring    encode string with two-byte length
 940 # ----- encodedouble    encode number as eight-byte double precision float
 941 # ----- encodelong              encode number as four-byte long
 942
 943 def encodestring(n)
 944   a,b=n.size.divmod(256)
 945   a.chr+b.chr+n
 946 end
 947
 948 def encodedouble(n)
 949   [n].pack('G')
 950 end
 951
 952 def encodelong(n)
 953   [n].pack('N')
 954 end
 955
 956 # ====================================================================
 957 # Co-ordinate conversion
 958
 959 def lat2coord(a,basey,masterscale)
 960   -(lat2y(a)-basey)*masterscale+250
 961 end
 962
 963 def long2coord(a,baselong,masterscale)
 964   (a-baselong)*masterscale+350
 965 end
 966
 967 def lat2y(a)
 968   180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
 969 end
 970
 971 def coord2lat(a,masterscale,basey)
 972   y2lat((a-250)/-masterscale+basey)
 973 end
 974
 975 def coord2long(a,masterscale,baselong)
 976   (a-350)/masterscale+baselong
 977 end
 978
 979 def y2lat(a)
 980   180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
 981 end
 982
 983 end