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openstreetmap-website/app/controllers/amf_controller.rb
Tom Hughes db66d47e42 Merge potlatch_010 branch to head.
2008-07-18 11:02:10 +00:00

670 lines
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# AMF Controller is a semi-standalone API for Flash clients, particularly Potlatch.
# All interaction between Potlatch (as a .SWF application) and the
# OSM database takes place using this controller. Messages are
# encoded in the Actionscript Message Format (AMF).
#
# See Also Potlatch::Potlatch and Potlatch::AMF
#
# Public domain.
# editions Systeme D / Richard Fairhurst 2004-2008
#
# All in/out parameters are floats unless explicitly stated.
#
# to trap errors (getway_old,putway,putpoi,deleteway only):
# return(-1,"message") <-- just puts up a dialogue
# return(-2,"message") <-- also asks the user to e-mail me
# to log:
# RAILS_DEFAULT_LOGGER.error("Args: #{args[0]}, #{args[1]}, #{args[2]}, #{args[3]}")
class AmfController < ApplicationController
require 'stringio'
include Potlatch
session :off
before_filter :check_write_availability
# Main AMF handler. Tha talk method takes in AMF, figures out what to do and dispatched to the appropriate private method
def talk
req=StringIO.new(request.raw_post+0.chr) # Get POST data as request
# (cf http://www.ruby-forum.com/topic/122163)
req.read(2) # Skip version indicator and client ID
results={} # Results of each body
renumberednodes={} # Shared across repeated putways
renumberedways={} # Shared across repeated putways
# -------------
# Parse request
headers=AMF.getint(req) # Read number of headers
headers.times do # Read each header
name=AMF.getstring(req) # |
req.getc # | skip boolean
value=AMF.getvalue(req) # |
header["name"]=value # |
end
bodies=AMF.getint(req) # Read number of bodies
bodies.times do # Read each body
message=AMF.getstring(req) # | get message name
index=AMF.getstring(req) # | get index in response sequence
bytes=AMF.getlong(req) # | get total size in bytes
args=AMF.getvalue(req) # | get response (probably an array)
case message
when 'getpresets'; results[index]=AMF.putdata(index,getpresets)
when 'whichways'; results[index]=AMF.putdata(index,whichways(args))
when 'whichways_deleted'; results[index]=AMF.putdata(index,whichways_deleted(args))
when 'getway'; results[index]=AMF.putdata(index,getway(args))
when 'getrelation'; results[index]=AMF.putdata(index,getrelation(args))
when 'getway_old'; results[index]=AMF.putdata(index,getway_old(args))
when 'getway_history'; results[index]=AMF.putdata(index,getway_history(args))
when 'putway'; r=putway(args,renumberednodes)
renumberednodes=r[3]
if r[1] != r[2]
renumberedways[r[1]] = r[2]
end
results[index]=AMF.putdata(index,r)
when 'putrelation'; results[index]=AMF.putdata(index,putrelation(args, renumberednodes, renumberedways))
when 'deleteway'; results[index]=AMF.putdata(index,deleteway(args))
when 'putpoi'; results[index]=AMF.putdata(index,putpoi(args))
when 'getpoi'; results[index]=AMF.putdata(index,getpoi(args))
end
end
# ------------------
# Write out response
RAILS_DEFAULT_LOGGER.info(" Response: start")
a,b=results.length.divmod(256)
render :content_type => "application/x-amf", :text => proc { |response, output|
output.write 0.chr+0.chr+0.chr+0.chr+a.chr+b.chr
results.each do |k,v|
output.write(v)
end
}
RAILS_DEFAULT_LOGGER.info(" Response: end")
end
private
# Return presets (default tags and crap) to potlatch.
# Uses POTLATCH_PRESETS global, set up in OSM::Potlatch
def getpresets #:doc:
return POTLATCH_PRESETS
end
# ----- whichways
# Find all the way ids and nodes (including tags and projected lat/lng) which aren't part of those ways in an are
#
# The argument is an array containing the following, in order:
# 0. minimum longitude
# 1. minimum latitude
# 2. maximum longitude
# 3. maximum latitude
# 4. baselong, 5. basey, 6. masterscale as above
def whichways(args) #:doc:
xmin = args[0].to_f-0.01
ymin = args[1].to_f-0.01
xmax = args[2].to_f+0.01
ymax = args[3].to_f+0.01
baselong = args[4]
basey = args[5]
masterscale = args[6]
def whichways(xmin, ymin, xmax, ymax) #:doc:
xmin -= 0.01; ymin -= 0.01
xmax += 0.01; ymax += 0.01
if POTLATCH_USE_SQL then
way_ids = sql_find_way_ids_in_area(xmin, ymin, xmax, ymax)
points = sql_find_pois_in_area(xmin, ymin, xmax, ymax)
relation_ids = sql_find_relations_in_area_and_ways(xmin, ymin, xmax, ymax, way_ids)
else
# find the way ids in an area
nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 1", :include => :ways)
way_ids = nodes_in_area.collect { |node| node.way_ids }.flatten.uniq
# find the node ids in an area that aren't part of ways
nodes_not_used_in_area = nodes_in_area.select { |node| node.ways.empty? }
points = nodes_not_used_in_area.collect { |n| [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash] }
# find the relations used by those nodes and ways
relations = Relation.find_for_nodes(nodes_in_area.collect { |n| n.id }, :conditions => "visible = 1") +
Relation.find_for_ways(way_ids, :conditions => "visible = 1")
relation_ids = relations.collect { |relation| relation.id }.uniq
end
[way_ids, points, relation_ids]
end
# ----- whichways_deleted
# return array of deleted ways in current bounding box
# in: as whichways
# does: finds all deleted ways with a deleted node in bounding box
# out: [0] array of way ids
def whichways_deleted(args) #:doc:
xmin = args[0].to_f-0.01
ymin = args[1].to_f-0.01
xmax = args[2].to_f+0.01
ymax = args[3].to_f+0.01
baselong = args[4]
basey = args[5]
masterscale = args[6]
def whichways_deleted(xmin, ymin, xmax, ymax) #:doc:
xmin -= 0.01; ymin -= 0.01
xmax += 0.01; ymax += 0.01
nodes_in_area = Node.find_by_area(ymin, xmin, ymax, xmax, :conditions => "current_nodes.visible = 0 AND current_ways.visible = 0", :include => :ways_via_history)
way_ids = nodes_in_area.collect { |node| node.ways_via_history_ids }.flatten.uniq
[way_ids]
end
# ----- getway
# Get a way with all of it's nodes and tags
# The input is an array with the following components, in order:
# 0. wayid - the ID of the way to get
# 1. baselong - origin of SWF map (longitude)
# 2. basey - origin of SWF map (latitude)
# 3. masterscale - SWF map scale
#
# The output is an array which contains all the nodes (with projected
# latitude and longitude) and tags for a way (and all the nodes tags).
# It also has the way's unprojected (WGS84) bbox.
#
# FIXME: The server really shouldn't be figuring out a ways bounding box and doing projection for potlatch
# FIXME: the argument splitting should be done in the 'talk' method, not here
def getway(args) #:doc:
wayid,baselong,basey,masterscale = args
wayid = wayid.to_i
def getway(wayid) #:doc:
if POTLATCH_USE_SQL then
points = sql_get_nodes_in_way(wayid)
tags = sql_get_tags_in_way(wayid)
else
# Ideally we would do ":include => :nodes" here but if we do that
# then rails only seems to return the first copy of a node when a
# way includes a node more than once
way = Way.find(wayid)
points = way.nodes.collect do |node|
[node.lon, node.lat, node.id, nil, node.tags_as_hash]
end
tags = way.tags
end
[wayid, points, tags]
end
# ----- getway_old
# returns old version of way
# in: [0] way id,
# [1] way version to get (or -1 for "last deleted version")
# [2] baselong, [3] basey, [4] masterscale
# does: gets old version of way and all constituent nodes
# for undelete, always uses the most recent version of each node
# (even if it's moved)
# for revert, uses the historic version of each node, but if that node is
# still visible and has been changed since, generates a new node id
# out: [0] 0 (code for success), [1] SWF object name,
# [2] array of points (as getway _except_ [3] is node.visible?, 0 or 1),
# [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox),
# [8] way version
def getway_old(args) #:doc:
RAILS_DEFAULT_LOGGER.info(" Message: getway_old (server is #{SERVER_URL})")
# if SERVER_URL=="www.openstreetmap.org" then return -1,"Revert is not currently enabled on the OpenStreetMap server." end
def getway_old(id, version) #:doc:
if version < 0
old_way = OldWay.find(:first, :conditions => ['visible = 1 AND id = ?', id], :order => 'version DESC')
points = old_way.get_nodes_undelete
else
old_way = OldWay.find(:first, :conditions => ['id = ? AND version = ?', id, version])
points = old_way.get_nodes_revert
end
old_way.tags['history'] = "Retrieved from v#{old_way.version}"
[0, id, points, old_way.tags, old_way.version]
end
def getway_history(wayid) #:doc:
history = Way.find(wayid).old_ways.collect do |old_way|
user = old_way.user.data_public? ? old_way.user.display_name : 'anonymous'
[old_way.version, old_way.timestamp.strftime("%d %b %Y, %H:%M"), old_way.visible ? 1 : 0, user]
end
[history]
end
# Get a relation with all tags and members.
# Returns:
# 0. relation id,
# 1. hash of tags,
# 2. list of members.
def getrelation(relid) #:doc:
rel = Relation.find(relid)
[relid, rel.tags, rel.members]
end
# ----- getrelation
# save relation to the database
# in: [0] user token (string),
# [1] original relation id (may be negative),
# [2] hash of tags, [3] list of members,
# [4] visible
# out: [0] 0 (success), [1] original relation id (unchanged),
# [2] new relation id
def putrelation(args, renumberednodes, renumberedways) #:doc:
usertoken,relid,tags,members,visible=args
uid=getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the point could not be saved." end
def putrelation(renumberednodes, renumberedways, usertoken, relid, tags, members, visible) #:doc:
uid = getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the relation could not be saved." end
relid = relid.to_i
visible = visible.to_i
# create a new relation, or find the existing one
if relid <= 0
rel = Relation.new
else
rel = Relation.find(relid)
end
# check the members are all positive, and correctly type
typedmembers = []
members.each do |m|
mid = m[1].to_i
if mid < 0
mid = renumberednodes[mid] if m[0] == 'node'
mid = renumberedways[mid] if m[0] == 'way'
if mid < 0
return -2, "Negative ID unresolved"
end
end
typedmembers << [m[0], mid, m[2]]
end
# assign new contents
rel.members = typedmembers
rel.tags = tags
rel.visible = visible
rel.user_id = uid
# check it then save it
# BUG: the following is commented out because it always fails on my
# install. I think it's a Rails bug.
#if !rel.preconditions_ok?
# return -2, "Relation preconditions failed"
#else
rel.save_with_history!
#end
[0, relid, rel.id]
end
# ----- putway
# saves a way to the database
# in: [0] user token (string),
# [1] original way id (may be negative),
# [2] array of points (as getway/getway_old),
# [3] hash of way tags,
# [4] original way version (0 if not a reverted/undeleted way),
# [5] baselong, [6] basey, [7] masterscale
# does: saves way to the database
# all constituent nodes are created/updated as necessary
# (or deleted if they were in the old version and are otherwise unused)
# out: [0] 0 (code for success), [1] original way id (unchanged),
# [2] new way id, [3] hash of renumbered nodes (old id=>new id),
# [4] xmin, [5] xmax, [6] ymin, [7] ymax (unprojected bbox)
def putway(args,renumberednodes) #:doc:
RAILS_DEFAULT_LOGGER.info(" putway started")
usertoken,originalway,points,attributes,oldversion,baselong,basey,masterscale=args
uid=getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the way could not be saved." end
def putway(renumberednodes, usertoken, originalway, points, attributes) #:doc:
# -- Initialise and carry out checks
uid = getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the way could not be saved." end
originalway = originalway.to_i
points.each do |a|
if a[2] == 0 or a[2].nil? then return -2,"Server error - node with id 0 found in way #{originalway}." end
if a[1] == 90 then return -2,"Server error - node with lat -90 found in way #{originalway}." end
end
if points.length < 2 then return -2,"Server error - way is only #{points.length} points long." end
# -- 3. read original way into memory
if originalway < 0
way = Way.new
uniques = []
else
way = Way.find(originalway)
uniques = way.unshared_node_ids
end
# -- 4. get version by inserting new row into ways
nodes = []
points.each do |n|
lon = n[0].to_f
lat = n[1].to_f
id = n[2].to_i
savenode = false
if renumberednodes[id]
id = renumberednodes[id]
elsif id < 0
# Create new node
node = Node.new
savenode = true
else
node = Node.find(id)
if !fpcomp(lat, node.lat) or !fpcomp(lon, node.lon) or
Tags.join(n[4]) != node.tags or !node.visible?
savenode = true
end
end
if savenode
node.user_id = uid
node.lat = lat
node.lon = lon
node.tags = Tags.join(n[4])
node.visible = true
node.save_with_history!
if id != node.id
renumberednodes[id] = node.id
id = node.id
end
end
uniques = uniques - [id]
nodes.push(id)
end
# -- Delete any unique nodes
uniques.each do |n|
deleteitemrelations(n, 'node')
node = Node.find(n)
node.user_id = uid
node.visible = false
node.save_with_history!
end
points.each_index do |i|
xs=coord2long(points[i][0],masterscale,baselong)
ys=coord2lat(points[i][1],masterscale,basey)
xmin=[xs,xmin].min; xmax=[xs,xmax].max
ymin=[ys,ymin].min; ymax=[ys,ymax].max
node=points[i][2].to_i
tagstr=array2tag(points[i][4])
tagsql="'"+sqlescape(tagstr)+"'"
lat=(ys * 10000000).round
long=(xs * 10000000).round
tile=QuadTile.tile_for_point(ys, xs)
way.tags = attributes
way.nds = nodes
way.user_id = uid
way.visible = true
way.save_with_history!
[0, originalway, way.id, renumberednodes]
end
# ----- putpoi
# save POI to the database
# in: [0] user token (string),
# [1] original node id (may be negative),
# [2] projected longitude, [3] projected latitude,
# [4] hash of tags, [5] visible (0 to delete, 1 otherwise),
# [6] baselong, [7] basey, [8] masterscale
# does: saves POI node to the database
# refuses save if the node has since become part of a way
# out: [0] 0 (success), [1] original node id (unchanged),
# [2] new node id
def putpoi(args) #:doc:
usertoken,id,x,y,tags,visible,baselong,basey,masterscale=args
uid=getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the point could not be saved." end
def putpoi(usertoken, id, lon, lat, tags, visible) #:doc:
uid = getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the point could not be saved." end
id = id.to_i
visible = (visible.to_i == 1)
if id > 0 then
node = Node.find(id)
if !visible then
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
deleteitemrelations(id, 'node')
end
else
node = Node.new
end
node.user_id = uid
node.lat = lat
node.lon = lon
node.tags = Tags.join(tags)
node.visible = visible
node.save_with_history!
[0, id, node.id]
end
# ----- getpoi
# read POI from database
# (only called on revert: POIs are usually read by whichways)
# in: [0] node id, [1] baselong, [2] basey, [3] masterscale
# does: reads POI
# out: [0] id (unchanged), [1] projected long, [2] projected lat,
# [3] hash of tags
def getpoi(args) #:doc:
id,baselong,basey,masterscale = args
n = Node.find(id.to_i)
if n
return [n.id, n.lon_potlatch(baselong,masterscale), n.lat_potlatch(basey,masterscale), n.tags_as_hash]
else
return [nil,nil,nil,'']
end
end
def getpoi(id) #:doc:
n = Node.find(id)
if n
return [n.id, n.lon, n.lat, n.tags_as_hash]
else
return [nil, nil, nil, '']
end
end
def deleteway(usertoken, way_id) #:doc:
uid = getuserid(usertoken)
if !uid then return -1,"You are not logged in, so the way could not be deleted." end
# FIXME: would be good not to make two history entries when removing
# two nodes from the same relation
user = User.find(uid)
way = Way.find(way_id)
way.unshared_node_ids.each do |n|
deleteitemrelations(n, 'node')
end
way.delete_with_relations_and_nodes_and_history(user)
[0, way_id]
end
def createuniquenodes(way,uqn_name,nodelist) #:doc:
# Find nodes which appear in this way but no others
sql=<<-EOF
CREATE TEMPORARY TABLE #{uqn_name}
SELECT a.node_id
FROM (SELECT DISTINCT node_id FROM current_way_nodes
WHERE id=#{way}) a
LEFT JOIN current_way_nodes b
ON b.node_id=a.node_id
AND b.id!=#{way}
WHERE b.node_id IS NULL
EOF
unless nodelist.empty? then
sql+="AND a.node_id NOT IN ("+nodelist.join(',')+")"
end
ActiveRecord::Base.connection.execute(sql)
end
# ====================================================================
# Relations handling
# deleteuniquenoderelations(uqn_name,uid,db_now)
# deleteitemrelations(way|node,'way'|'node',uid,db_now)
def deleteuniquenoderelations(uqn_name,uid,db_now) #:doc:
sql=<<-EOF
SELECT node_id,cr.id FROM #{uqn_name},current_relation_members crm,current_relations cr
WHERE crm.member_id=node_id
AND crm.member_type='node'
AND crm.id=cr.id
AND cr.visible=1
EOF
def deleteitemrelations(objid, type) #:doc:
relations = RelationMember.find(:all,
:conditions => ['member_type = ? and member_id = ?', type, objid],
:include => :relation).collect { |rm| rm.relation }.uniq
relations.each do |rel|
rel.members.delete_if { |x| x[0] == type and x[1] == objid }
rel.save_with_history!
end
end
def deleteitemrelations(objid,type,uid,db_now) #:doc:
sql=<<-EOF
SELECT cr.id FROM current_relation_members crm,current_relations cr
WHERE crm.member_id=#{objid}
AND crm.member_type='#{type}'
AND crm.id=cr.id
AND cr.visible=1
EOF
relways=ActiveRecord::Base.connection.select_all(sql)
relways.each do |a|
removefromrelation(objid,type,a['id'],uid,db_now)
end
end
def removefromrelation(objid,type,relation,uid,db_now) #:doc:
rver=ActiveRecord::Base.connection.insert("INSERT INTO relations (id,user_id,timestamp,visible) VALUES (#{relation},#{uid},#{db_now},1)")
tagsql=<<-EOF
INSERT INTO relation_tags (id,k,v,version)
SELECT id,k,v,#{rver} FROM current_relation_tags
WHERE id=#{relation}
EOF
ActiveRecord::Base.connection.insert(tagsql)
membersql=<<-EOF
INSERT INTO relation_members (id,member_type,member_id,member_role,version)
SELECT id,member_type,member_id,member_role,#{rver} FROM current_relation_members
WHERE id=#{relation}
AND (member_id!=#{objid} OR member_type!='#{type}')
EOF
ActiveRecord::Base.connection.insert(membersql)
ActiveRecord::Base.connection.update("UPDATE current_relations SET user_id=#{uid},timestamp=#{db_now} WHERE id=#{relation}")
ActiveRecord::Base.connection.execute("DELETE FROM current_relation_members WHERE id=#{relation} AND member_type='#{type}' AND member_id=#{objid}")
end
def sqlescape(a) #:doc:
a.gsub(/[\000-\037]/,"").gsub("'","''").gsub(92.chr) {92.chr+92.chr}
end
def tag2array(a) #:doc:
tags={}
Tags.split(a) do |k, v|
tags[k.gsub(':','|')]=v
end
tags
end
def array2tag(a) #:doc:
tags = []
a.each do |k,v|
if v=='' then next end
if v[0,6]=='(type ' then next end
tags << [k.gsub('|',':'), v]
end
return Tags.join(tags)
end
def getuserid(token) #:doc:
if (token =~ /^(.+)\+(.+)$/) then
user = User.authenticate(:username => $1, :password => $2)
else
user = User.authenticate(:token => token)
end
return user ? user.id : nil;
end
# ====================================================================
# Co-ordinate conversion
def lat2coord(a,basey,masterscale) #:doc:
-(lat2y(a)-basey)*masterscale
end
def long2coord(a,baselong,masterscale) #:doc:
(a-baselong)*masterscale
end
def lat2y(a) #:doc:
180/Math::PI * Math.log(Math.tan(Math::PI/4+a*(Math::PI/180)/2))
end
def coord2lat(a,masterscale,basey) #:doc:
y2lat(a/-masterscale+basey)
end
def coord2long(a,masterscale,baselong) #:doc:
a/masterscale+baselong
end
def y2lat(a)
180/Math::PI * (2*Math.atan(Math.exp(a*Math::PI/180))-Math::PI/2)
end
end
# Local Variables:
# indent-tabs-mode: t
# tab-width: 4
# End:
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