source: subversion/sites/rails_port_branches/api06/app/controllers/amf_controller.rb @ 12284

Revision 12284, 29.0 KB checked in by zere, 5 years ago (diff)

Some fixes to the rails part of the AMF controller and associated test.

Line 
1# amf_controller is a semi-standalone API for Flash clients, particularly
2# Potlatch. All interaction between Potlatch (as a .SWF application) and the
3# OSM database takes place using this controller. Messages are
4# encoded in the Actionscript Message Format (AMF).
5#
6# Helper functions are in /lib/potlatch.rb
7#
8# Author::      editions Systeme D / Richard Fairhurst 2004-2008
9# Licence::     public domain.
10#
11# == General structure
12#
13# Apart from the amf_read and amf_write methods (which distribute the requests
14# from the AMF message), each method generally takes arguments in the order
15# they were sent by the Potlatch SWF. Do not assume typing has been preserved.
16# Methods all return an array to the SWF.
17#
18# == API 0.6
19#
20# Note that this requires a patched version of composite_primary_keys 1.1.0
21# (see http://groups.google.com/group/compositekeys/t/a00e7562b677e193)
22# if you are to run with POTLATCH_USE_SQL=false .
23#
24# == Debugging
25#
26# Any method that returns a status code (0 for ok) can also send:
27#       return(-1,"message")            <-- just puts up a dialogue
28#       return(-2,"message")            <-- also asks the user to e-mail me
29#
30# To write to the Rails log, use RAILS_DEFAULT_LOGGER.info("message").
31
32class AmfController < ApplicationController
33  require 'stringio'
34
35  include Potlatch
36
37  # Help methods for checking boundary sanity and area size
38  include MapBoundary
39
40  session :off
41  before_filter :check_write_availability
42
43  # Main AMF handlers: process the raw AMF string (using AMF library) and
44  # calls each action (private method) accordingly.
45  # ** FIXME: refactor to reduce duplication of code across read/write
46 
47  def amf_read
48    req=StringIO.new(request.raw_post+0.chr)# Get POST data as request
49                              # (cf http://www.ruby-forum.com/topic/122163)
50    req.read(2)                                                         # Skip version indicator and client ID
51    results={}                                                          # Results of each body
52
53    # Parse request
54
55    headers=AMF.getint(req)                                     # Read number of headers
56
57    headers.times do                                            # Read each header
58      name=AMF.getstring(req)                           #  |
59      req.getc                                                          #  | skip boolean
60      value=AMF.getvalue(req)                           #  |
61      header["name"]=value                                      #  |
62    end
63
64    bodies=AMF.getint(req)                                      # Read number of bodies
65    bodies.times do                                                     # Read each body
66      message=AMF.getstring(req)                        #  | get message name
67      index=AMF.getstring(req)                          #  | get index in response sequence
68      bytes=AMF.getlong(req)                            #  | get total size in bytes
69      args=AMF.getvalue(req)                            #  | get response (probably an array)
70      logger.info "Executing AMF #{message}:#{index}"
71
72      case message
73        when 'getpresets';                      results[index]=AMF.putdata(index,getpresets())
74        when 'whichways';                       results[index]=AMF.putdata(index,whichways(*args))
75        when 'whichways_deleted';       results[index]=AMF.putdata(index,whichways_deleted(*args))
76        when 'getway';                          results[index]=AMF.putdata(index,getway(args[0].to_i))
77        when 'getrelation';                     results[index]=AMF.putdata(index,getrelation(args[0].to_i))
78        when 'getway_old';                      results[index]=AMF.putdata(index,getway_old(args[0].to_i,args[1].to_i))
79        when 'getway_history';          results[index]=AMF.putdata(index,getway_history(args[0].to_i))
80        when 'getnode_history';         results[index]=AMF.putdata(index,getnode_history(args[0].to_i))
81        when 'findgpx';                         results[index]=AMF.putdata(index,findgpx(*args))
82        when 'findrelations';           results[index]=AMF.putdata(index,findrelations(*args))
83        when 'getpoi';                          results[index]=AMF.putdata(index,getpoi(*args))
84      end
85    end
86    logger.info("encoding AMF results")
87    sendresponse(results)
88  end
89
90  def amf_write
91    req=StringIO.new(request.raw_post+0.chr)
92    req.read(2)
93    results={}
94    renumberednodes={}                                          # Shared across repeated putways
95    renumberedways={}                                           # Shared across repeated putways
96
97    headers=AMF.getint(req)                                     # Read number of headers
98    headers.times do                                            # Read each header
99      name=AMF.getstring(req)                           #  |
100      req.getc                                                          #  | skip boolean
101      value=AMF.getvalue(req)                           #  |
102      header["name"]=value                                      #  |
103    end
104
105    bodies=AMF.getint(req)                                      # Read number of bodies
106    bodies.times do                                                     # Read each body
107      message=AMF.getstring(req)                        #  | get message name
108      index=AMF.getstring(req)                          #  | get index in response sequence
109      bytes=AMF.getlong(req)                            #  | get total size in bytes
110      args=AMF.getvalue(req)                            #  | get response (probably an array)
111
112      case message
113        when 'putway';                          r=putway(renumberednodes,*args)
114                                                                        renumberednodes=r[3]
115                                                                        if r[1] != r[2] then renumberedways[r[1]] = r[2] end
116                                                                        results[index]=AMF.putdata(index,r)
117        when 'putrelation';                     results[index]=AMF.putdata(index,putrelation(renumberednodes, renumberedways, *args))
118        when 'deleteway';                       results[index]=AMF.putdata(index,deleteway(*args))
119        when 'putpoi';                          r=putpoi(*args)
120                                                                        if r[1] != r[2] then renumberednodes[r[1]] = r[2] end
121                                                                results[index]=AMF.putdata(index,r)
122        when 'startchangeset';          results[index]=AMF.putdata(index,startchangeset(*args))
123      end
124    end
125    sendresponse(results)
126  end
127
128  private
129
130  # Start new changeset
131 
132  def startchangeset(usertoken, cstags, closeid, closecomment)
133    user = getuserid(usertoken)
134    if !user then return -1,"You are not logged in, so Potlatch can't write any changes to the database." end
135
136    # close previous changeset and add comment
137    if closeid
138      cs = Changeset.find(closeid)
139      cs.set_closed_time_now
140      if closecomment.empty?
141        cs.save!
142      else
143        cs.tags['comment']=closecomment
144        cs.save_with_tags!
145      end
146    end
147       
148    # open a new changeset
149    cs = Changeset.new
150    cs.tags = cstags
151    cs.user_id = uid
152    # Don't like the next two lines. These need to be abstracted to the model more/better
153    cs.created_at = Time.now
154    cs.closed_at = Time.new + Changeset::IDLE_TIMEOUT
155    cs.save_with_tags!
156    return [0,cs.id]
157  end
158
159  # Return presets (default tags, localisation etc.):
160  # uses POTLATCH_PRESETS global, set up in OSM::Potlatch.
161
162  def getpresets() #:doc:
163    return POTLATCH_PRESETS
164  end
165
166  ##
167  # Find all the ways, POI nodes (i.e. not part of ways), and relations
168  # in a given bounding box. Nodes are returned in full; ways and relations
169  # are IDs only.
170  #
171  # return is of the form:
172  # [error_code,
173  #  [[way_id, way_version], ...],
174  #  [[node_id, lat, lon, [tags, ...]], ...],
175  #  [[rel_id, rel_version], ...]]
176  # where the ways are any visible ways which refer to any visible
177  # nodes in the bbox, nodes are any visible nodes in the bbox but not
178  # used in any way, rel is any relation which refers to either a way
179  # or node that we're returning.
180  def whichways(xmin, ymin, xmax, ymax) #:doc:
181    xmin -= 0.01; ymin -= 0.01
182    xmax += 0.01; ymax += 0.01
183   
184    # check boundary is sane and area within defined
185    # see /config/application.yml
186    check_boundaries(xmin, ymin, xmax, ymax)
187
188    if POTLATCH_USE_SQL then
189      ways = sql_find_ways_in_area(xmin, ymin, xmax, ymax)
190      points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
191      relations = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, ways.collect {|x| x[0]})
192    else
193      # find the way ids in an area
194      nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_nodes.visible = ?", true], :include => :ways)
195      ways = nodes_in_area.inject([]) { |sum, node| 
196        visible_ways = node.ways.select { |w| w.visible? }
197        sum + visible_ways.collect { |w| [w.id,w.version] }
198      }.uniq
199      ways.delete([])
200
201      # find the node ids in an area that aren't part of ways
202      nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
203      points = nodes_not_used_in_area.collect { |n| [n.id, n.lon, n.lat, n.tags] }
204
205      # find the relations used by those nodes and ways
206      relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => {:visible => true}) +
207                  Relation.find_for_ways(ways.collect { |w| w[0] }, :conditions => {:visible => true})
208      relations = relations.collect { |relation| [relation.id,relation.version] }.uniq
209    end
210
211    [0,ways, points, relations]
212
213  rescue Exception => err
214    [-2,"Sorry - I can't get the map for that area."]
215  end
216
217  # Find deleted ways in current bounding box (similar to whichways, but ways
218  # with a deleted node only - not POIs or relations).
219
220  def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
221    xmin -= 0.01; ymin -= 0.01
222    xmax += 0.01; ymax += 0.01
223
224    # check boundary is sane and area within defined
225    # see /config/application.yml
226    begin
227      check_boundaries(xmin, ymin, xmax, ymax)
228    rescue Exception => err
229      return [-2,"Sorry - I can't get the map for that area."]
230    end
231
232    nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => ["current_ways.visible = ?", false], :include => :ways_via_history)
233    way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
234
235    [0,way_ids]
236  end
237
238  # Get a way including nodes and tags.
239  # Returns the way id, a Potlatch-style array of points, a hash of tags, and the version number.
240
241  def getway(wayid) #:doc:
242    if POTLATCH_USE_SQL then
243      points = sql_get_nodes_in_way(wayid)
244      tags = sql_get_tags_in_way(wayid)
245      version = sql_get_way_version(wayid)
246      else
247        # Ideally we would do ":include => :nodes" here but if we do that
248        # then rails only seems to return the first copy of a node when a
249        # way includes a node more than once
250        begin
251          way = Way.find(wayid)
252        rescue ActiveRecord::RecordNotFound
253          return [wayid,[],{}]
254        end
255
256        # check case where way has been deleted or doesn't exist
257        return [wayid,[],{}] if way.nil? or !way.visible
258
259        points = way.nodes.collect do |node|
260        nodetags=node.tags
261        nodetags.delete('created_by')
262        [node.lon, node.lat, node.id, nodetags]
263      end
264      tags = way.tags
265      version = way.version
266    end
267
268    [wayid, points, tags, version]
269  end
270
271  # Get an old version of a way, and all constituent nodes.
272  #
273  # For undelete (version<0), always uses the most recent version of each node,
274  # even if it's moved.  For revert (version >= 0), uses the node in existence
275  # at the time, generating a new id if it's still visible and has been moved/
276  # retagged.
277  #
278  # Returns:
279  # 0. success code,
280  # 1. id,
281  # 2. array of points,
282  # 3. hash of tags,
283  # 4. version,
284  # 5. is this the current, visible version? (boolean)
285
286  def getway_old(id, version) #:doc:
287    if version < 0
288      old_way = OldWay.find(:first, :conditions => ['visible = ? AND id = ?', true, id], :order => 'version DESC')
289      points = old_way.get_nodes_undelete unless old_way.nil?
290    else
291      old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
292      points = old_way.get_nodes_revert unless old_way.nil?
293    end
294
295    if old_way.nil?
296      return [-1, id, [], {}, -1,0]
297    else
298      curway=Way.find(id)
299      old_way.tags['history'] = "Retrieved from v#{old_way.version}"
300      return [0, id, points, old_way.tags, old_way.version, (curway.version==old_way.version and curway.visible)]
301    end
302  end
303 
304  # Find history of a way. Returns 'way', id, and
305  # an array of previous versions.
306
307  def getway_history(wayid) #:doc:
308    begin
309      history = Way.find(wayid).old_ways.reverse.collect do |old_way|
310        user_object = old_way.changeset.user
311        user = user_object.data_public? ? user_object.display_name : 'anonymous'
312        uid  = user_object.data_public? ? user_object.id : 0
313        [old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user, uid]
314      end
315
316      return ['way',wayid,history]
317    rescue ActiveRecord::RecordNotFound
318      return ['way', wayid, []]
319    end
320  end
321
322  # Find history of a node. Returns 'node', id, and
323  # an array of previous versions.
324
325  def getnode_history(nodeid) #:doc:
326    history = Node.find(nodeid).old_nodes.reverse.collect do |old_node|
327      user_object = old_node.changeset.user
328      user = user_object.data_public? ? user_object.display_name : 'anonymous'
329      uid  = user_object.data_public? ? user_object.id : 0
330      [old_node.version, old_node.timestamp.strftime("%d %b %Y, %H:%M"), old_node.visible ? 1 : 0, user, uid]
331    end
332   
333    return ['node',nodeid,history]
334  rescue ActiveRecord::RecordNotFound
335    return ['node', nodeid, []]
336  end
337
338  # Find GPS traces with specified name/id.
339  # Returns array listing GPXs, each one comprising id, name and description.
340 
341  def findgpx(searchterm, usertoken)
342    uid = getuserid(usertoken)
343    if !uid then return -1,"You must be logged in to search for GPX traces." end
344
345    gpxs = []
346    if searchterm.to_i>0 then
347      gpx = Trace.find(searchterm.to_i, :conditions => ["visible=? AND (public=? OR user_id=?)",true,true,uid] )
348      if gpx then
349        gpxs.push([gpx.id, gpx.name, gpx.description])
350      end
351    else
352      Trace.find(:all, :limit => 21, :conditions => ["visible=? AND (public=? OR user_id=?) AND MATCH(name) AGAINST (?)",true,true,uid,searchterm] ).each do |gpx|
353      gpxs.push([gpx.id, gpx.name, gpx.description])
354          end
355        end
356    gpxs
357  end
358
359  # Get a relation with all tags and members.
360  # Returns:
361  # 0. relation id,
362  # 1. hash of tags,
363  # 2. list of members,
364  # 3. version.
365 
366  def getrelation(relid) #:doc:
367    begin
368      rel = Relation.find(relid)
369    rescue ActiveRecord::RecordNotFound
370      return [relid, {}, []]
371    end
372
373    return [relid, {}, [], nil] if rel.nil? or !rel.visible
374    [relid, rel.tags, rel.members, rel.version]
375  end
376
377  # Find relations with specified name/id.
378  # Returns array of relations, each in same form as getrelation.
379 
380  def findrelations(searchterm)
381    rels = []
382    if searchterm.to_i>0 then
383      rel = Relation.find(searchterm.to_i)
384      if rel and rel.visible then
385        rels.push([rel.id, rel.tags, rel.members])
386      end
387    else
388      RelationTag.find(:all, :limit => 11, :conditions => ["match(v) against (?)", searchterm] ).each do |t|
389      if t.relation.visible then
390              rels.push([t.relation.id, t.relation.tags, t.relation.members])
391            end
392          end
393        end
394    rels
395  end
396
397  # Save a relation.
398  # Returns
399  # 0. 0 (success),
400  # 1. original relation id (unchanged),
401  # 2. new relation id.
402
403  def putrelation(renumberednodes, renumberedways, usertoken, changeset, version, relid, tags, members, visible) #:doc:
404    user = getuserid(usertoken)
405    if !user then return -1,"You are not logged in, so the relation could not be saved." end
406
407    relid = relid.to_i
408    visible = (visible.to_i != 0)
409
410    # create a new relation, or find the existing one
411    if relid > 0
412      relation = Relation.find(relid)
413    end
414    # We always need a new node, based on the data that has been sent to us
415    new_relation = Relation.new
416
417    # check the members are all positive, and correctly type
418    typedmembers = []
419    members.each do |m|
420      mid = m[1].to_i
421      if mid < 0
422        mid = renumberednodes[mid] if m[0] == 'node'
423        mid = renumberedways[mid] if m[0] == 'way'
424      end
425      if mid
426        typedmembers << [m[0], mid, m[2]]
427      end
428    end
429
430    # assign new contents
431    new_relation.members = typedmembers
432    new_relation.tags = tags
433    new_relation.visible = visible
434    new_relation.changeset_id = changeset
435    new_relation.version = version
436
437
438    if id <= 0
439      # We're creating the node
440      new_relation.create_with_history(user)
441    elsif visible
442      # We're updating the node
443      relation.update_from(new_relation, user)
444    else
445      # We're deleting the node
446      relation.delete_with_history!(new_relation, user)
447    end
448     
449    if id <= 0
450      return [0, relid, new_relation.id, new_relation.version]
451    else
452      return [0, relid, relation.id, relation.version]
453    end
454  rescue OSM::APIChangesetAlreadyClosedError => ex
455    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}"]
456  rescue OSM::APIVersionMismatchError => ex
457    # Really need to check to see whether this is a server load issue, and the
458    # last version was in the same changeset, or belongs to the same user, then
459    # we can return something different
460    return [-3, "You have taken too long to edit, please reload the area"]
461  rescue OSM::APIAlreadyDeletedError => ex
462    return [-1, "The object has already been deleted"]
463  rescue OSM::APIError => ex
464    # Some error that we don't specifically catch
465    return [-2, "Something really bad happened :-()"]
466  end
467
468  # Save a way to the database, including all nodes. Any nodes in the previous
469  # version and no longer used are deleted.
470  #
471  # Returns:
472  # 0. '0' (code for success),
473  # 1. original way id (unchanged),
474  # 2. new way id,
475  # 3. hash of renumbered nodes (old id=>new id),
476  # 4. version
477
478  def putway(renumberednodes, usertoken, changeset, originalway, points, attributes) #:doc:
479
480    # -- Initialise and carry out checks
481       
482    user = getuser(usertoken)
483    if !user then return -1,"You are not logged in, so the way could not be saved." end
484
485    originalway = originalway.to_i
486
487    points.each do |a|
488      if a[2] == 0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
489      if a[1] == 90 then return -2,"Server error - node with lat -90 found in way #{originalway}." end
490    end
491
492    if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
493
494    # -- Get unique nodes
495
496    if originalway <= 0
497      uniques = []
498    else
499      way = Way.find(originalway)
500      uniques = way.unshared_node_ids
501    end
502    new_way = Way.new
503
504    # -- Compare nodes and save changes to any that have changed
505
506    nodes = []
507
508    points.each do |n|
509      lon = n[0].to_f
510      lat = n[1].to_f
511      id = n[2].to_i
512      version = n[3].to_i # FIXME which index does the version come in on????
513      savenode = false
514      # We always need a new node if we are saving it
515      new_node = Node.new
516
517
518      if renumberednodes[id]
519        id = renumberednodes[id]
520      end
521      if id <= 0
522        # Create new node
523        savenode = true
524      else
525        # Don't modify this node, make any changes you want to the new_node above
526        node = Node.find(id)
527        nodetags=node.tags
528        nodetags.delete('created_by')
529        if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or
530           n[4] != nodetags or !node.visible?
531          savenode = true
532        end
533      end
534
535      if savenode
536        new_node.changeset_id = changeset
537        new_node.lat = lat
538        new_node.lon = lon
539        new_node.tags = n[4]
540        new_node.visible = true
541        new_node.version = version
542        if id <= 0
543          # We're creating the node
544          new_node.create_with_history(user)
545        else
546          # We're updating the node (no delete here)
547          node.update_from(new_node, user)
548        end
549
550        if id != node.id
551          renumberednodes[id] = node.id
552          id = node.id
553        end
554      end
555
556      uniques = uniques - [id]
557      nodes.push(id)
558    end
559
560    # -- Delete any unique nodes
561       
562    uniques.each do |n|
563      deleteitemrelations(n, 'node')
564
565      node = Node.find(n)
566      new_node = Node.new
567      new_node.changeset_id = changeset
568      new_node.version = version
569      node.delete_with_history!(new_node, user)
570    end
571
572    # -- Save revised way
573
574    if way.tags!=attributes or way.nds!=nodes or !way.visible?
575      new_way = Way.new
576      new_way.tags = attributes
577      new_way.nds = nodes
578      new_way.changeset_id = changeset
579      new_way.version = version
580      way.update_from(new_way, user)
581    end
582
583    [0, originalway, way.id, renumberednodes, way.version]
584  rescue OSM::APIChangesetAlreadyClosedError => ex
585    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}"]
586  rescue OSM::APIVersionMismatchError => ex
587    # Really need to check to see whether this is a server load issue, and the
588    # last version was in the same changeset, or belongs to the same user, then
589    # we can return something different
590    return [-3, "You have taken too long to edit, please reload the area"]
591  rescue OSM::APIAlreadyDeletedError => ex
592    return [-1, "The object has already been deleted"]
593  rescue OSM::APIError => ex
594    # Some error that we don't specifically catch
595    return [-2, "Something really bad happened :-()"]
596  end
597
598  # Save POI to the database.
599  # Refuses save if the node has since become part of a way.
600  # Returns array with:
601  # 0. 0 (success),
602  # 1. original node id (unchanged),
603  # 2. new node id,
604  # 3. version.
605
606  def putpoi(usertoken, changeset, version, id, lon, lat, tags, visible) #:doc:
607    user = getuser(usertoken)
608    if !user then return -1,"You are not logged in, so the point could not be saved." end
609
610    id = id.to_i
611    visible = (visible.to_i == 1)
612
613    if id > 0 then
614      node = Node.find(id)
615
616      if !visible then
617        unless node.ways.empty? then return -1,"The point has since become part of a way, so you cannot save it as a POI." end
618        deleteitemrelations(id, 'node')
619      end
620    end
621    # We always need a new node, based on the data that has been sent to us
622    new_node = Node.new
623
624    new_node.id = id
625    new_node.changeset_id = changeset
626    new_node.version = version
627    new_node.lat = lat
628    new_node.lon = lon
629    new_node.tags = tags
630    new_node.visible = visible
631    if id <= 0 
632      # We're creating the node
633      new_node.create_with_history(user)
634    elsif visible
635      # We're updating the node
636      node.update_from(new_node, user)
637    else
638      # We're deleting the node
639      node.delete_with_history!(new_node, user)
640    end
641
642    if id <= 0
643      return [0, id, new_node.id, new_node.version]
644    else
645      return [0, id, node.id, node.version]
646    end
647  rescue OSM::APIChangesetAlreadyClosedError => ex
648    return [-1, "The changeset #{ex.changeset.id} was closed at #{ex.changeset.closed_at}"]
649  rescue OSM::APIVersionMismatchError => ex
650        # Really need to check to see whether this is a server load issue, and the
651    # last version was in the same changeset, or belongs to the same user, then
652    # we can return something different
653    return [-3, "You have taken too long to edit, please reload the area"]
654  rescue OSM::APIAlreadyDeletedError => ex
655    return [-1, "The object has already been deleted"]
656  rescue OSM::APIError => ex
657    # Some error that we don't specifically catch
658    return [-2, "Something really bad happened :-()"]
659  end
660
661  # Read POI from database
662  # (only called on revert: POIs are usually read by whichways).
663  #
664  # Returns array of id, long, lat, hash of tags, version.
665
666  def getpoi(id,version) #:doc:
667    if version>0 then
668        n = OldNode.find(id, :conditions=>['version=?',version])
669    else
670      n = Node.find(id)
671    end
672
673    if n
674      return [n.id, n.lon, n.lat, n.tags, n.version]
675    else
676      return [nil, nil, nil, {}, nil]
677    end
678  end
679
680  # Delete way and all constituent nodes. Also removes from any relations.
681  # Returns 0 (success), unchanged way id.
682
683  def deleteway(usertoken, changeset_id, way_id, version_id) #:doc:
684    user = getuser(usertoken)
685    if user then return -1,"You are not logged in, so the way could not be deleted." end
686    # Need a transaction so that if one item fails to delete, the whole delete fails.
687    Way.transaction do
688      way_id = way_id.to_i
689
690      # FIXME: would be good not to make two history entries when removing
691      #          two nodes from the same relation
692      old_way = Way.find(way_id)
693      old_way.unshared_node_ids.each do |n|
694        deleteitemrelations(n, 'node')
695      end
696      deleteitemrelations(way_id, 'way')
697
698      way.delete_with_relations_and_nodes_and_history(changeset_id.to_i)
699    end
700    [0, way_id]
701  end
702
703
704  # ====================================================================
705  # Support functions
706
707  # Remove a node or way from all relations
708  # FIXME needs version, changeset, and user
709  def deleteitemrelations(objid, type) #:doc:
710    relations = RelationMember.find(:all, 
711                                                                        :conditions => ['member_type = ? and member_id = ?', type, objid], 
712                                                                        :include => :relation).collect { |rm| rm.relation }.uniq
713
714    relations.each do |rel|
715      rel.members.delete_if { |x| x[0] == type and x[1] == objid }
716      # FIXME need to create the new node/way based on the type.
717      new_rel = Relation.new
718      new_rel.version = version
719      new_rel.members = members
720      new_rel.changeset = changeset
721      rel.delete_with_history(new_rel, user)
722    end
723  end
724
725  # Break out node tags into a hash
726  # (should become obsolete as of API 0.6)
727
728  def tagstring_to_hash(a) #:doc:
729    tags={}
730    Tags.split(a) do |k, v|
731      tags[k]=v
732    end
733    tags
734  end
735
736  # Authenticate token
737  # (can also be of form user:pass)
738  # When we are writing to the api, we need the actual user model,
739  # not just the id, hence this abstraction
740
741  def getuser(token) #:doc:
742    if (token =~ /^(.+)\:(.+)$/) then
743      user = User.authenticate(:username => $1, :password => $2)
744    else
745      user = User.authenticate(:token => token)
746    end
747    return user
748  end
749 
750  def getuserid(token)
751    user = getuser(token)
752    return user ? user.id : nil;
753  end
754
755  # Compare two floating-point numbers to within 0.0000001
756
757  def fpcomp(a,b) #:doc:
758    return ((a/0.0000001).round==(b/0.0000001).round)
759  end
760
761  # Send AMF response
762 
763  def sendresponse(results)
764    a,b=results.length.divmod(256)
765    render :content_type => "application/x-amf", :text => proc { |response, output| 
766      # ** move amf writing loop into here -
767      # basically we read the messages in first (into an array of some sort),
768      # then iterate through that array within here, and do all the AMF writing
769      output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
770      results.each do |k,v|
771        output.write(v)
772      end
773    }
774  end
775
776
777  # ====================================================================
778  # Alternative SQL queries for getway/whichways
779
780  def sql_find_ways_in_area(xmin,ymin,xmax,ymax)
781    sql=<<-EOF
782    SELECT DISTINCT current_ways.id AS wayid,current_ways.version AS version
783      FROM current_way_nodes
784    INNER JOIN current_nodes ON current_nodes.id=current_way_nodes.node_id
785    INNER JOIN current_ways  ON current_ways.id =current_way_nodes.id
786       WHERE current_nodes.visible=TRUE
787       AND current_ways.visible=TRUE
788       AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
789    EOF
790    return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['wayid'].to_i,a['version'].to_i] }
791  end
792       
793  def sql_find_pois_in_area(xmin,ymin,xmax,ymax)
794    pois=[]
795    sql=<<-EOF
796                  SELECT current_nodes.id,current_nodes.latitude*0.0000001 AS lat,current_nodes.longitude*0.0000001 AS lon,current_nodes.version
797                        FROM current_nodes
798       LEFT OUTER JOIN current_way_nodes cwn ON cwn.node_id=current_nodes.id
799                   WHERE current_nodes.visible=TRUE
800                         AND cwn.id IS NULL
801                         AND #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "current_nodes.")}
802    EOF
803    ActiveRecord::Base.connection.select_all(sql).each do |row|
804      poitags={}
805      ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
806        poitags[n['k']]=n['v']
807      end
808      pois << [row['id'].to_i, row['lon'].to_f, row['lat'].to_f, poitags, row['version'].to_i]
809    end
810    pois
811  end
812       
813  def sql_find_relations_in_area_and_ways(xmin,ymin,xmax,ymax,way_ids)
814    # ** It would be more Potlatchy to get relations for nodes within ways
815    #    during 'getway', not here
816    sql=<<-EOF
817      SELECT DISTINCT cr.id AS relid,cr.version AS version
818      FROM current_relations cr
819      INNER JOIN current_relation_members crm ON crm.id=cr.id
820      INNER JOIN current_nodes cn ON crm.member_id=cn.id AND crm.member_type='node'
821       WHERE #{OSM.sql_for_area(ymin, xmin, ymax, xmax, "cn.")}
822      EOF
823    unless way_ids.empty?
824      sql+=<<-EOF
825       UNION
826        SELECT DISTINCT cr.id AS relid,cr.version AS version
827        FROM current_relations cr
828        INNER JOIN current_relation_members crm ON crm.id=cr.id
829         WHERE crm.member_type='way'
830         AND crm.member_id IN (#{way_ids.join(',')})
831        EOF
832    end
833    return ActiveRecord::Base.connection.select_all(sql).collect { |a| [a['relid'].to_i,a['version'].to_i] }
834  end
835       
836  def sql_get_nodes_in_way(wayid)
837    points=[]
838    sql=<<-EOF
839      SELECT latitude*0.0000001 AS lat,longitude*0.0000001 AS lon,current_nodes.id
840      FROM current_way_nodes,current_nodes
841       WHERE current_way_nodes.id=#{wayid.to_i}
842                   AND current_way_nodes.node_id=current_nodes.id
843                   AND current_nodes.visible=TRUE
844      ORDER BY sequence_id
845          EOF
846    ActiveRecord::Base.connection.select_all(sql).each do |row|
847      nodetags={}
848      ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_node_tags WHERE id=#{row['id']}").each do |n|
849        nodetags[n['k']]=n['v']
850      end
851      nodetags.delete('created_by')
852      points << [row['lon'].to_f,row['lat'].to_f,row['id'].to_i,nodetags]
853    end
854    points
855  end
856       
857  def sql_get_tags_in_way(wayid)
858    tags={}
859    ActiveRecord::Base.connection.select_all("SELECT k,v FROM current_way_tags WHERE id=#{wayid.to_i}").each do |row|
860      tags[row['k']]=row['v']
861    end
862    tags
863  end
864
865  def sql_get_way_version(wayid)
866    ActiveRecord::Base.connection.select_one("SELECT version FROM current_ways WHERE id=#{wayid.to_i}")
867  end
868end
869
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