X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/92418b7954d8915734f07a66abf76f52b437a517..724d92d5f1992a2327982144e66697516ab82d8b:/lib/osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index af9608132..71e12534f 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,77 +1,576 @@
+# The OSM module provides support functions for OSM.
 module OSM
+  require "time"
+  require "rexml/parsers/sax2parser"
+  require "rexml/text"
+  require "xml/libxml"
 
-  # This piece of magic reads a GPX with SAX and spits out
-  # lat/lng and stuff
-  #
-  # This would print every latitude value:
-  #
-  # gpx = OSM:GPXImporter.new('somefile.gpx')
-  # gpx.points {|p| puts p['latitude']}
-  
-  require 'time'
-  require 'rexml/parsers/sax2parser'
-  require 'rexml/text'
-
-  class GPXImporter
-    attr_reader :possible_points
-    attr_reader :actual_points
-    attr_reader :tracksegs
-
-    def initialize(filename)
-      @filename = filename
-      @possible_points = 0
-      @actual_points = 0
-      @tracksegs = 0
-    end
-
-    def points
-      file = File.new(@filename)
-      parser = REXML::Parsers::SAX2Parser.new( file )
-
-      lat = -1
-      lon = -1
-      ele = -1
-      date = Time.now();
-      gotlatlon = false
-      gotele = false
-      gotdate = false
-
-      parser.listen( :start_element,  %w{ trkpt }) do |uri,localname,qname,attributes| 
-        lat = attributes['lat'].to_f
-        lon = attributes['lon'].to_f
-        gotlatlon = true
-        @possible_points += 1
-      end
+  if defined?(SystemTimer)
+    Timer = SystemTimer
+  else
+    require "timeout"
+    Timer = Timeout
+  end
 
-      parser.listen( :characters, %w{ ele } ) do |text|
-        ele = text
-        gotele = true
-      end
+  # The base class for API Errors.
+  class APIError < RuntimeError
+    def status
+      :internal_server_error
+    end
 
-      parser.listen( :characters, %w{ time } ) do |text|
-        if text && text != ''
-          date = Time.parse(text)
-          gotdate = true
-        end
-      end
+    def to_s
+      "Generic API Error"
+    end
+  end
 
-      parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
-        @tracksegs += 1
-      end
+  # Raised when access is denied.
+  class APIAccessDenied < RuntimeError
+    def status
+      :forbidden
+    end
+
+    def to_s
+      "Access denied"
+    end
+  end
+
+  # Raised when an API object is not found.
+  class APINotFoundError < APIError
+    def status
+      :not_found
+    end
+
+    def to_s
+      "Object not found"
+    end
+  end
+
+  # Raised when a precondition to an API action fails sanity check.
+  class APIPreconditionFailedError < APIError
+    def initialize(message = "")
+      @message = message
+    end
+
+    def status
+      :precondition_failed
+    end
+
+    def to_s
+      "Precondition failed: #{@message}"
+    end
+  end
+
+  # Raised when to delete an already-deleted object.
+  class APIAlreadyDeletedError < APIError
+    def initialize(object = "object", object_id = "")
+      @object = object
+      @object_id = object_id
+    end
+
+    attr_reader :object, :object_id
+
+    def status
+      :gone
+    end
+
+    def to_s
+      "The #{object} with the id #{object_id} has already been deleted"
+    end
+  end
+
+  # Raised when the user logged in isn't the same as the changeset
+  class APIUserChangesetMismatchError < APIError
+    def status
+      :conflict
+    end
+
+    def to_s
+      "The user doesn't own that changeset"
+    end
+  end
+
+  # Raised when the changeset provided is already closed
+  class APIChangesetAlreadyClosedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "The changeset #{@changeset.id} was closed at #{@changeset.closed_at}"
+    end
+  end
+
+  # Raised when the changeset provided is not yet closed
+  class APIChangesetNotYetClosedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "The changeset #{@changeset.id} is not yet closed."
+    end
+  end
+
+  # Raised when a user is already subscribed to the changeset
+  class APIChangesetAlreadySubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "You are already subscribed to changeset #{@changeset.id}."
+    end
+  end
+
+  # Raised when a user is not subscribed to the changeset
+  class APIChangesetNotSubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+    end
+
+    attr_reader :changeset
+
+    def status
+      :not_found
+    end
+
+    def to_s
+      "You are not subscribed to changeset #{@changeset.id}."
+    end
+  end
+
+  # Raised when a change is expecting a changeset, but the changeset doesn't exist
+  class APIChangesetMissingError < APIError
+    def status
+      :conflict
+    end
+
+    def to_s
+      "You need to supply a changeset to be able to make a change"
+    end
+  end
+
+  # Raised when a diff is uploaded containing many changeset IDs which don't match
+  # the changeset ID that the diff was uploaded to.
+  class APIChangesetMismatchError < APIError
+    def initialize(provided, allowed)
+      @provided = provided
+      @allowed = allowed
+    end
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "Changeset mismatch: Provided #{@provided} but only #{@allowed} is allowed"
+    end
+  end
+
+  # Raised when a diff upload has an unknown action. You can only have create,
+  # modify, or delete
+  class APIChangesetActionInvalid < APIError
+    def initialize(provided)
+      @provided = provided
+    end
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      "Unknown action #{@provided}, choices are create, modify, delete"
+    end
+  end
+
+  # Raised when bad XML is encountered which stops things parsing as
+  # they should.
+  class APIBadXMLError < APIError
+    def initialize(model, xml, message = "")
+      @model = model
+      @xml = xml
+      @message = message
+    end
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      "Cannot parse valid #{@model} from xml string #{@xml}. #{@message}"
+    end
+  end
+
+  # Raised when the provided version is not equal to the latest in the db.
+  class APIVersionMismatchError < APIError
+    def initialize(id, type, provided, latest)
+      @id = id
+      @type = type
+      @provided = provided
+      @latest = latest
+    end
+
+    attr_reader :provided, :latest, :id, :type
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "Version mismatch: Provided #{provided}, server had: #{latest} of #{type} #{id}"
+    end
+  end
+
+  # raised when a two tags have a duplicate key string in an element.
+  # this is now forbidden by the API.
+  class APIDuplicateTagsError < APIError
+    def initialize(type, id, tag_key)
+      @type = type
+      @id = id
+      @tag_key = tag_key
+    end
+
+    attr_reader :type, :id, :tag_key
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      "Element #{@type}/#{@id} has duplicate tags with key #{@tag_key}"
+    end
+  end
+
+  # Raised when a way has more than the configured number of way nodes.
+  # This prevents ways from being to long and difficult to work with
+  class APITooManyWayNodesError < APIError
+    def initialize(id, provided, max)
+      @id = id
+      @provided = provided
+      @max = max
+    end
+
+    attr_reader :id, :provided, :max
+
+    def status
+      :bad_request
+    end
 
-      parser.listen( :end_element, %w{ trkpt } ) do |uri,localname,qname|
-        if gotlatlon && gotdate
-          ele = '0' unless gotele
-          if lat < 90 && lat > -90 && lon > -180 && lon < 180
-            @actual_points += 1
-            yield Hash['latitude' => lat,'longitude' => lon,'timestamp' => date,'altitude' => ele,'segment' => @tracksegs]
-          end
-        end
-        gotlatlon = false
-        gotele = false
-        gotdate = false
+    def to_s
+      "You tried to add #{provided} nodes to way #{id}, however only #{max} are allowed"
+    end
+  end
+
+  ##
+  # raised when user input couldn't be parsed
+  class APIBadUserInput < APIError
+    def initialize(message)
+      @message = message
+    end
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      @message
+    end
+  end
+
+  ##
+  # raised when bounding box is invalid
+  class APIBadBoundingBox < APIError
+    def initialize(message)
+      @message = message
+    end
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      @message
+    end
+  end
+
+  ##
+  # raised when an API call is made using a method not supported on that URI
+  class APIBadMethodError < APIError
+    def initialize(supported_method)
+      @supported_method = supported_method
+    end
+
+    def status
+      :method_not_allowed
+    end
+
+    def to_s
+      "Only method #{@supported_method} is supported on this URI"
+    end
+  end
+
+  ##
+  # raised when an API call takes too long
+  class APITimeoutError < APIError
+    def status
+      :request_timeout
+    end
+
+    def to_s
+      "Request timed out"
+    end
+  end
+
+  ##
+  # raised when someone tries to redact a current version of
+  # an element - only historical versions can be redacted.
+  class APICannotRedactError < APIError
+    def status
+      :bad_request
+    end
+
+    def to_s
+      "Cannot redact current version of element, only historical versions may be redacted."
+    end
+  end
+
+  # Raised when the note provided is already closed
+  class APINoteAlreadyClosedError < APIError
+    def initialize(note)
+      @note = note
+    end
+
+    attr_reader :note
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "The note #{@note.id} was closed at #{@note.closed_at}"
+    end
+  end
+
+  # Raised when the note provided is already open
+  class APINoteAlreadyOpenError < APIError
+    def initialize(note)
+      @note = note
+    end
+
+    attr_reader :note
+
+    def status
+      :conflict
+    end
+
+    def to_s
+      "The note #{@note.id} is already open"
+    end
+  end
+
+  # raised when a two preferences have a duplicate key string.
+  class APIDuplicatePreferenceError < APIError
+    def initialize(key)
+      @key = key
+    end
+
+    attr_reader :key
+
+    def status
+      :bad_request
+    end
+
+    def to_s
+      "Duplicate preferences with key #{@key}"
+    end
+  end
+
+  # Helper methods for going to/from mercator and lat/lng.
+  class Mercator
+    include Math
+
+    # init me with your bounding box and the size of your image
+    def initialize(min_lat, min_lon, max_lat, max_lon, width, height)
+      xsize = xsheet(max_lon) - xsheet(min_lon)
+      ysize = ysheet(max_lat) - ysheet(min_lat)
+      xscale = xsize / width
+      yscale = ysize / height
+      scale = [xscale, yscale].max
+
+      xpad = width * scale - xsize
+      ypad = height * scale - ysize
+
+      @width = width
+      @height = height
+
+      @tx = xsheet(min_lon) - xpad / 2
+      @ty = ysheet(min_lat) - ypad / 2
+
+      @bx = xsheet(max_lon) + xpad / 2
+      @by = ysheet(max_lat) + ypad / 2
+    end
+
+    # the following two functions will give you the x/y on the entire sheet
+
+    def ysheet(lat)
+      log(tan(PI / 4 + (lat * PI / 180 / 2))) / (PI / 180)
+    end
+
+    def xsheet(lon)
+      lon
+    end
+
+    # and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
+
+    def y(lat)
+      @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
+    end
+
+    def x(lon)
+      ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
+    end
+  end
+
+  class GreatCircle
+    include Math
+
+    # initialise with a base position
+    def initialize(lat, lon)
+      @lat = lat * PI / 180
+      @lon = lon * PI / 180
+    end
+
+    # get the distance from the base position to a given position
+    def distance(lat, lon)
+      lat = lat * PI / 180
+      lon = lon * PI / 180
+      6372.795 * 2 * asin(sqrt(sin((lat - @lat) / 2)**2 + cos(@lat) * cos(lat) * sin((lon - @lon) / 2)**2))
+    end
+
+    # get the worst case bounds for a given radius from the base position
+    def bounds(radius)
+      latradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2)**2))
+
+      begin
+        lonradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2)**2 / cos(@lat)**2))
+      rescue Errno::EDOM, Math::DomainError
+        lonradius = PI
       end
-      parser.parse
+
+      minlat = [(@lat - latradius) * 180 / PI, -90].max
+      maxlat = [(@lat + latradius) * 180 / PI, 90].min
+      minlon = [(@lon - lonradius) * 180 / PI, -180].max
+      maxlon = [(@lon + lonradius) * 180 / PI, 180].min
+
+      BoundingBox.new(minlon, minlat, maxlon, maxlat)
     end
+
+    # get the SQL to use to calculate distance
+    def sql_for_distance(lat_field, lon_field)
+      "6372.795 * 2 * asin(sqrt(power(sin((radians(#{lat_field}) - #{@lat}) / 2), 2) + cos(#{@lat}) * cos(radians(#{lat_field})) * power(sin((radians(#{lon_field}) - #{@lon})/2), 2)))"
+    end
+  end
+
+  class API
+    def get_xml_doc
+      doc = XML::Document.new
+      doc.encoding = XML::Encoding::UTF_8
+      root = XML::Node.new "osm"
+      root["version"] = API_VERSION.to_s
+      root["generator"] = GENERATOR
+      root["copyright"] = COPYRIGHT_OWNER
+      root["attribution"] = ATTRIBUTION_URL
+      root["license"] = LICENSE_URL
+      doc.root = root
+      doc
+    end
+  end
+
+  def self.ip_to_country(ip_address)
+    ipinfo = geoip_database.country(ip_address) if defined?(GEOIP_DATABASE)
+
+    if ipinfo
+      country = ipinfo.country_code2
+    else
+      country = http_client.get("http://api.hostip.info/country.php?ip=#{ip_address}").body
+      country = "GB" if country == "UK"
+    end
+
+    country
+  rescue StandardError
+    nil
+  end
+
+  def self.ip_location(ip_address)
+    code = OSM.ip_to_country(ip_address)
+
+    if code && country = Country.find(code)
+      return { :minlon => country.min_lon, :minlat => country.min_lat, :maxlon => country.max_lon, :maxlat => country.max_lat }
+    end
+
+    nil
+  end
+
+  # Parse a float, raising a specified exception on failure
+  def self.parse_float(str, klass, *args)
+    Float(str)
+  rescue StandardError
+    raise klass.new(*args)
+  end
+
+  # Construct a random token of a given length
+  def self.make_token(length = 30)
+    chars = "abcdefghijklmnopqrtuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+    token = ""
+
+    length.times do
+      token += chars[(rand * chars.length).to_i].chr
+    end
+
+    token
+  end
+
+  # Return an SQL fragment to select a given area of the globe
+  def self.sql_for_area(bbox, prefix = nil)
+    tilesql = QuadTile.sql_for_area(bbox, prefix)
+    bbox = bbox.to_scaled
+
+    "#{tilesql} AND #{prefix}latitude BETWEEN #{bbox.min_lat} AND #{bbox.max_lat} " \
+      "AND #{prefix}longitude BETWEEN #{bbox.min_lon} AND #{bbox.max_lon}"
+  end
+
+  # Return the terms and conditions text for a given country
+  def self.legal_text_for_country(country_code)
+    file_name = Rails.root.join("config", "legales", country_code.to_s + ".yml")
+    file_name = Rails.root.join("config", "legales", DEFAULT_LEGALE + ".yml") unless File.exist? file_name
+    YAML.load_file(file_name)
+  end
+
+  # Return the HTTP client to use
+  def self.http_client
+    @http_client ||= Faraday.new
+  end
+
+  # Return the GeoIP database handle
+  def self.geoip_database
+    @geoip_database ||= GeoIP.new(GEOIP_DATABASE) if defined?(GEOIP_DATABASE)
   end
 end