X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/92418b7954d8915734f07a66abf76f52b437a517..36bd711c52600ba18665bfd58471ef1edec17f08:/lib/osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index af9608132..dd273418e 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,77 +1,545 @@
+# 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
+  # The base class for API Errors.
+  class APIError < RuntimeError
+    def initialize(message = "Generic API Error")
+      super
+    end
 
-      parser.listen( :characters, %w{ ele } ) do |text|
-        ele = text
-        gotele = true
-      end
+    def status
+      :internal_server_error
+    end
+  end
 
-      parser.listen( :characters, %w{ time } ) do |text|
-        if text && text != ''
-          date = Time.parse(text)
-          gotdate = true
-        end
-      end
+  # Raised when access is denied.
+  class APIAccessDenied < APIError
+    def initialize
+      super("Access denied")
+    end
+
+    def status
+      :forbidden
+    end
+  end
+
+  # Raised when an API object is not found.
+  class APINotFoundError < APIError
+    def initialize
+      super("Object not found")
+    end
+
+    def status
+      :not_found
+    end
+  end
+
+  # Raised when a precondition to an API action fails sanity check.
+  class APIPreconditionFailedError < APIError
+    def initialize(message = "")
+      super("Precondition failed: #{message}")
+    end
+
+    def status
+      :precondition_failed
+    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
+
+      super("The #{object} with the id #{object_id} has already been deleted")
+    end
+
+    attr_reader :object, :object_id
+
+    def status
+      :gone
+    end
+  end
+
+  # Raised when the user logged in isn't the same as the changeset
+  class APIUserChangesetMismatchError < APIError
+    def initialize
+      super("The user doesn't own that changeset")
+    end
+
+    def status
+      :conflict
+    end
+  end
+
+  # Raised when the changeset provided is already closed
+  class APIChangesetAlreadyClosedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+
+      super("The changeset #{changeset.id} was closed at #{changeset.closed_at}")
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+  end
+
+  # Raised when the changeset provided is not yet closed
+  class APIChangesetNotYetClosedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+
+      super("The changeset #{changeset.id} is not yet closed.")
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+  end
+
+  # Raised when a user is already subscribed to the changeset
+  class APIChangesetAlreadySubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+
+      super("You are already subscribed to changeset #{changeset.id}.")
+    end
+
+    attr_reader :changeset
+
+    def status
+      :conflict
+    end
+  end
+
+  # Raised when a user is not subscribed to the changeset
+  class APIChangesetNotSubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
+
+      super("You are not subscribed to changeset #{changeset.id}.")
+    end
+
+    attr_reader :changeset
+
+    def status
+      :not_found
+    end
+  end
+
+  # Raised when a change is expecting a changeset, but the changeset doesn't exist
+  class APIChangesetMissingError < APIError
+    def initialize
+      super("You need to supply a changeset to be able to make a change")
+    end
+
+    def status
+      :conflict
+    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)
+      super("Changeset mismatch: Provided #{provided} but only #{allowed} is allowed")
+    end
+
+    def status
+      :conflict
+    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)
+      super("Unknown action #{provided}, choices are create, modify, delete")
+    end
+
+    def status
+      :bad_request
+    end
+  end
+
+  # Raised when bad XML is encountered which stops things parsing as
+  # they should.
+  class APIBadXMLError < APIError
+    def initialize(model, xml, message = "")
+      super("Cannot parse valid #{model} from xml string #{xml}. #{message}")
+    end
+
+    def status
+      :bad_request
+    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
+
+      super("Version mismatch: Provided #{provided}, server had: #{latest} of #{type} #{id}")
+    end
+
+    attr_reader :provided, :latest, :id, :type
+
+    def status
+      :conflict
+    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
+
+      super("Element #{type}/#{id} has duplicate tags with key #{tag_key}")
+    end
+
+    attr_reader :type, :id, :tag_key
+
+    def status
+      :bad_request
+    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)
+      super("You tried to add #{provided} nodes to way #{id}, however only #{max} are allowed")
+
+      @id = id
+      @provided = provided
+      @max = max
+    end
+
+    attr_reader :id, :provided, :max
+
+    def status
+      :bad_request
+    end
+  end
+
+  # Raised when a relation has more than the configured number of relation members.
+  # This prevents relations from being too complex and difficult to work with
+  class APITooManyRelationMembersError < APIError
+    def initialize(id, provided, max)
+      super("You tried to add #{provided} members to relation #{id}, however only #{max} are allowed")
+
+      @id = id
+      @provided = provided
+      @max = max
+    end
+
+    attr_reader :id, :provided, :max
+
+    def status
+      :bad_request
+    end
+  end
 
-      parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
-        @tracksegs += 1
+  ##
+  # raised when user input couldn't be parsed
+  class APIBadUserInput < APIError
+    def status
+      :bad_request
+    end
+  end
+
+  ##
+  # raised when bounding box is invalid
+  class APIBadBoundingBox < APIError
+    def status
+      :bad_request
+    end
+  end
+
+  ##
+  # raised when an API call is made using a method not supported on that URI
+  class APIBadMethodError < APIError
+    def initialize(supported_method)
+      super("Only method #{supported_method} is supported on this URI")
+    end
+
+    def status
+      :method_not_allowed
+    end
+  end
+
+  ##
+  # raised when an API call takes too long
+  class APITimeoutError < APIError
+    def initialize
+      super("Request timed out")
+    end
+
+    def status
+      :request_timeout
+    end
+  end
+
+  ##
+  # raised when someone tries to redact a current version of
+  # an element - only historical versions can be redacted.
+  class APICannotRedactError < APIError
+    def initialize
+      super("Cannot redact current version of element, only historical versions may be redacted.")
+    end
+
+    def status
+      :bad_request
+    end
+  end
+
+  # Raised when the note provided is already closed
+  class APINoteAlreadyClosedError < APIError
+    def initialize(note)
+      @note = note
+
+      super("The note #{note.id} was closed at #{note.closed_at}")
+    end
+
+    attr_reader :note
+
+    def status
+      :conflict
+    end
+  end
+
+  # Raised when the note provided is already open
+  class APINoteAlreadyOpenError < APIError
+    def initialize(note)
+      @note = note
+
+      super("The note #{note.id} is already open")
+    end
+
+    attr_reader :note
+
+    def status
+      :conflict
+    end
+  end
+
+  # raised when a two preferences have a duplicate key string.
+  class APIDuplicatePreferenceError < APIError
+    def initialize(key)
+      @key = key
+
+      super("Duplicate preferences with key #{key}")
+    end
+
+    attr_reader :key
+
+    def status
+      :bad_request
+    end
+  end
+
+  # Raised when a rate limit is exceeded
+  class APIRateLimitExceeded < APIError
+    def initialize
+      super("Rate limit exceeded")
+    end
+
+    def status
+      :too_many_requests
+    end
+  end
+
+  # Raised when a size limit is exceeded
+  class APISizeLimitExceeded < APIError
+    def initialize
+      super("Size limit exceeded")
+    end
+
+    def status
+      :payload_too_large
+    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
+    # If the bbox has no extent, return the centre of the image to avoid dividing by zero.
+
+    def y(lat)
+      return @height / 2 if (@by - @ty).zero?
+
+      @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
+    end
+
+    def x(lon)
+      return @width / 2 if (@bx - @tx).zero?
+
+      ((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.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
+      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 xml_doc
+      doc = XML::Document.new
+      doc.encoding = XML::Encoding::UTF_8
+      root = XML::Node.new "osm"
+      xml_root_attributes.each do |k, v|
+        root[k] = v
       end
-      parser.parse
+      doc.root = root
+      doc
+    end
+
+    def xml_root_attributes
+      { "version" => Settings.api_version,
+        "generator" => Settings.generator,
+        "copyright" => Settings.copyright_owner,
+        "attribution" => Settings.attribution_url,
+        "license" => Settings.license_url }
+    end
+  end
+
+  def self.ip_to_country(ip_address)
+    ipinfo = maxmind_database.lookup(ip_address) if Settings.key?(:maxmind_database)
+
+    return ipinfo.country.iso_code if ipinfo&.found?
+
+    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 = 24)
+    SecureRandom.urlsafe_base64(length)
+  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}.yml")
+    file_name = Rails.root.join("config", "legales", "#{Settings.default_legale}.yml") unless File.exist? file_name
+    YAML.load_file(file_name).transform_values!(&:html_safe)
+  end
+
+  # Return the HTTP client to use
+  def self.http_client
+    @http_client ||= Faraday.new(:request => { :timeout => 15 })
+  end
+
+  # Return the MaxMindDB database handle
+  def self.maxmind_database
+    @maxmind_database ||= MaxMindDB.new(Settings.maxmind_database) if Settings.key?(:maxmind_database)
   end
 end