X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/2ba147e7fa0ba03fbf9881b54271dffd0b6bc02b..7f3b86e30b09dc9d21cabf97248edbde08b12d4d:/lib/osm.rb

diff --git a/lib/osm.rb b/lib/osm.rb
index b14a7f3e8..b6dd64b99 100644
--- a/lib/osm.rb
+++ b/lib/osm.rb
@@ -1,251 +1,389 @@
+# The OSM module provides support functions for OSM.
 module OSM
+  require "time"
+  require "rexml/parsers/sax2parser"
+  require "rexml/text"
+  require "xml/libxml"
+
+  # The base class for API Errors.
+  class APIError < RuntimeError
+    def initialize(message = "Generic API Error")
+      super message
+    end
 
-  # 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'
-  require 'xml/libxml'
-  require 'digest/md5'
-  require 'RMagick'
+    def status
+      :internal_server_error
+    end
+  end
 
-  class Mercator
-    include Math
+  # Raised when access is denied.
+  class APIAccessDenied < APIError
+    def initialize
+      super "Access denied"
+    end
 
-    def initialize(lat, lon, degrees_per_pixel, width, height)
-      #init me with your centre lat/lon, the number of degrees per pixel and the size of your image
-      @clat = lat
-      @clon = lon
-      @degrees_per_pixel = degrees_per_pixel
-      @degrees_per_pixel = 0.0000000001 if @degrees_per_pixel < 0.0000000001
-      @width = width
-      @height = height
-      @dlon = width / 2 * @degrees_per_pixel
-      @dlat = height / 2 * @degrees_per_pixel  * cos(@clat * PI / 180)
+    def status
+      :forbidden
+    end
+  end
 
-      @tx = xsheet(@clon - @dlon)
-      @ty = ysheet(@clat - @dlat)
+  # Raised when an API object is not found.
+  class APINotFoundError < APIError
+    def initialize
+      super "Object not found"
+    end
 
-      @bx = xsheet(@clon + @dlon)
-      @by = ysheet(@clat + @dlat)
+    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
 
-    #the following two functions will give you the x/y on the entire sheet
+    def status
+      :precondition_failed
+    end
+  end
 
-    def kilometerinpixels
-      return 40008.0  / 360.0 * @degrees_per_pixel
+  # 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
 
-    def ysheet(lat)
-      log(tan(PI / 4 +  (lat  * PI / 180 / 2)))
+    attr_reader :object, :object_id
+
+    def status
+      :gone
     end
+  end
 
-    def xsheet(lon)
-      lon
+  # 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
 
-    #and these two will give you the right points on your image. all the constants can be reduced to speed things up. FIXME
+    def status
+      :conflict
+    end
+  end
 
-    def y(lat)
-      return @height - ((ysheet(lat) - @ty) / (@by - @ty) * @height)
+  # 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
 
-    def x(lon)
-      return  ((xsheet(lon) - @tx) / (@bx - @tx) * @width)
+    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
 
-  class GPXImporter
-    # FIXME swap REXML for libXML
-    attr_reader :possible_points
-    attr_reader :actual_points
-    attr_reader :tracksegs
+    attr_reader :changeset
 
-    def initialize(filename)
-      @filename = filename
+    def status
+      :conflict
     end
+  end
 
-    def points
-      @possible_points = 0
-      @actual_points = 0
-      @tracksegs = 0
+  # Raised when a user is already subscribed to the changeset
+  class APIChangesetAlreadySubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
 
-      lat = -1
-      lon = -1
-      ele = -1
-      date = DateTime.now();
-      gotlatlon = false
-      gotele = false
-      gotdate = false
+      super "You are already subscribed to changeset #{changeset.id}."
+    end
 
-      parser = REXML::Parsers::SAX2Parser.new(File.new(@filename))
+    attr_reader :changeset
 
-      parser.listen( :start_element,  %w{ trkpt }) do |uri,localname,qname,attributes| 
-        lat = attributes['lat'].to_f
-        lon = attributes['lon'].to_f
-        gotlatlon = true
-        gotele = false
-        gotdate = false
-        @possible_points += 1
-      end
+    def status
+      :conflict
+    end
+  end
 
-      parser.listen( :characters, %w{ ele } ) do |text|
-        ele = text
-        gotele = true
-      end
+  # Raised when a user is not subscribed to the changeset
+  class APIChangesetNotSubscribedError < APIError
+    def initialize(changeset)
+      @changeset = changeset
 
-      parser.listen( :characters, %w{ time } ) do |text|
-        if text && text != ''
-          begin
-            date = DateTime.parse(text)
-            gotdate = true
-          rescue
-          end
-        end
-      end
+      super "You are not subscribed to changeset #{changeset.id}."
+    end
 
-      parser.listen( :end_element, %w{ trkseg } ) do |uri, localname, qname|
-        @tracksegs += 1
-      end
+    attr_reader :changeset
 
-      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
-      end
+    def status
+      :not_found
+    end
+  end
 
-      parser.parse
+  # 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 get_picture(min_lat, min_lon, max_lat, max_lon, num_points)
-      #puts "getting picfor bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
-      frames = 10
-      width = 250
-      height = 250
-      rat= Math.cos( ((max_lat + min_lat)/2.0) /  180.0 * 3.141592)
-      proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
+    def status
+      :conflict
+    end
+  end
 
-      linegc = Magick::Draw.new
-      linegc.stroke_linejoin('miter')
-      linegc.stroke_width(1)
-      linegc.stroke('#BBBBBB')
-      linegc.fill('#BBBBBB')
+  # 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
 
-      highlightgc = Magick::Draw.new
-      highlightgc.stroke_linejoin('miter')
-      highlightgc.stroke_width(3)
-      highlightgc.stroke('#000000')
-      highlightgc.fill('#000000')
+    def status
+      :conflict
+    end
+  end
 
-      images = []
+  # 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
 
-      frames.times do
-        image = Magick::Image.new(width, height) do |image|
-          image.background_color = 'white'
-          image.format = 'GIF'
-        end
+    def status
+      :bad_request
+    end
+  end
 
-        images << image
-      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
 
-      oldpx = 0.0
-      oldpy = 0.0
+    def status
+      :bad_request
+    end
+  end
 
-      first = true
+  # 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
 
-      m = 0
-      mm = 0
-      points do |p|
-        px = proj.x(p['longitude'])
-        py = proj.y(p['latitude'])
+      super "Version mismatch: Provided #{provided}, server had: #{latest} of #{type} #{id}"
+    end
 
-        if m > 0
-          frames.times do |n|
-            if n == mm
-              gc = highlightgc.dup
-            else
-              gc = linegc.dup
-            end
+    attr_reader :provided, :latest, :id, :type
 
-            gc.line(px, py, oldpx, oldpy)
+    def status
+      :conflict
+    end
+  end
 
-            gc.draw(images[n])
-          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
 
-        m += 1
-        if m > num_points.to_f / frames.to_f * (mm+1)
-          mm += 1
-        end
+      super "Element #{type}/#{id} has duplicate tags with key #{tag_key}"
+    end
 
-        oldpy = py
-        oldpx = px
-      end
+    attr_reader :type, :id, :tag_key
 
-      il = Magick::ImageList.new
+    def status
+      :bad_request
+    end
+  end
 
-      images.each do |f|
-        il << f
-      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
 
-      il.delay = 50
-      il.format = 'GIF'
+  ##
+  # raised when user input couldn't be parsed
+  class APIBadUserInput < APIError
+    def status
+      :bad_request
+    end
+  end
 
-      return il.to_blob
+  ##
+  # raised when bounding box is invalid
+  class APIBadBoundingBox < APIError
+    def status
+      :bad_request
     end
+  end
 
-    def get_icon(min_lat, min_lon, max_lat, max_lon)
-      #puts "getting icon for bbox #{min_lat},#{min_lon} - #{max_lat},#{max_lon}"
-      width = 50
-      height = 50
-      rat= Math.cos( ((max_lat + min_lat)/2.0) /  180.0 * 3.141592)
-      proj = OSM::Mercator.new((min_lat + max_lat) / 2, (max_lon + min_lon) / 2, (max_lat - min_lat) / width / rat, width, height)
+  ##
+  # 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
 
-      gc = Magick::Draw.new
-      gc.stroke_linejoin('miter')
-      gc.stroke_width(1)
-      gc.stroke('#000000')
-      gc.fill('#000000')
+    def status
+      :method_not_allowed
+    end
+  end
 
-      image = Magick::Image.new(width, height) do |image|
-        image.background_color = 'white'
-        image.format = 'GIF'
-      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
 
-      oldpx = 0.0
-      oldpy = 0.0
+    def status
+      :bad_request
+    end
+  end
 
-      first = true
+  # Raised when the note provided is already closed
+  class APINoteAlreadyClosedError < APIError
+    def initialize(note)
+      @note = note
 
-      points do |p|
-        px = proj.x(p['longitude'])
-        py = proj.y(p['latitude'])
+      super "The note #{note.id} was closed at #{note.closed_at}"
+    end
 
-        gc.dup.line(px, py, oldpx, oldpy).draw(image) unless first
+    attr_reader :note
 
-        first = false
-        oldpy = py
-        oldpx = px
-      end
+    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
+
+  # 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
 
-      return image.to_blob
+    # 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
@@ -261,168 +399,114 @@ module OSM
     def distance(lat, lon)
       lat = lat * PI / 180
       lon = lon * PI / 180
-      return 6372.795 * 2 * asin(sqrt(sin((lat - @lat) / 2) ** 2 + cos(@lat) * cos(lat) * sin((lon - @lon)/2) ** 2))
+      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))
-      lonradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2) ** 2 / cos(@lat) ** 2))
-      minlat = (@lat - latradius) * 180 / PI
-      maxlat = (@lat + latradius) * 180 / PI
-      minlon = (@lon - lonradius) * 180 / PI
-      maxlon = (@lon + lonradius) * 180 / PI
-      return { :minlat => minlat, :maxlat => maxlat, :minlon => minlon, :maxlon => maxlon }
-    end
-  end
-
-  class GeoRSS
-    def initialize(feed_title='OpenStreetMap GPS Traces', feed_description='OpenStreetMap GPS Traces', feed_url='http://www.openstreetmap.org/traces/')
-      @doc = XML::Document.new
-      @doc.encoding = 'UTF-8' 
-      
-      rss = XML::Node.new 'rss'
-      @doc.root = rss
-      rss['version'] = "2.0"
-      rss['xmlns:geo'] = "http://www.w3.org/2003/01/geo/wgs84_pos#"
-      @channel = XML::Node.new 'channel'
-      rss << @channel
-      title = XML::Node.new 'title'
-      title <<  feed_title
-      @channel << title
-      description_el = XML::Node.new 'description'
-      @channel << description_el
-
-      description_el << feed_description
-      link = XML::Node.new 'link'
-      link << feed_url
-      @channel << link
-      image = XML::Node.new 'image'
-      @channel << image
-      url = XML::Node.new 'url'
-      url << 'http://www.openstreetmap.org/images/mag_map-rss2.0.png'
-      image << url
-      title = XML::Node.new 'title'
-      title << "OpenStreetMap"
-      image << title
-      width = XML::Node.new 'width'
-      width << '100'
-      image << width
-      height = XML::Node.new 'height'
-      height << '100'
-      image << height
-      link = XML::Node.new 'link'
-      link << feed_url
-      image << link
-    end
-
-    def add(latitude=0, longitude=0, title_text='dummy title', author_text='anonymous', url='http://www.example.com/', description_text='dummy description', timestamp=DateTime.now)
-      item = XML::Node.new 'item'
-
-      title = XML::Node.new 'title'
-      item << title
-      title << title_text
-      link = XML::Node.new 'link'
-      link << url
-      item << link
-
-      guid = XML::Node.new 'guid'
-      guid << url
-      item << guid
-
-      description = XML::Node.new 'description'
-      description << description_text
-      item << description
-
-      author = XML::Node.new 'author'
-      author << author_text
-      item << author
-
-      pubDate = XML::Node.new 'pubDate'
-      pubDate << timestamp.to_s(:rfc822)
-      item << pubDate
-
-      if latitude
-        lat_el = XML::Node.new 'geo:lat'
-        lat_el << latitude.to_s
-        item << lat_el
-      end
+      latradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2)**2))
 
-      if longitude
-        lon_el = XML::Node.new 'geo:long'
-        lon_el << longitude.to_s
-        item << lon_el
+      begin
+        lonradius = 2 * asin(sqrt(sin(radius / 6372.795 / 2)**2 / cos(@lat)**2))
+      rescue Errno::EDOM, Math::DomainError
+        lonradius = PI
       end
 
-      @channel << item
+      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
 
-    def to_s
-      return @doc.to_s
+    # 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 = 'UTF-8' 
-      root = XML::Node.new 'osm'
-      root['version'] = API_VERSION
-      root['generator'] = 'OpenStreetMap server'
-      doc.root = root
-      return doc
-    end
-  end
-
-  def self.IPLocation(ip_address)
-    Timeout::timeout(4) do
-      Net::HTTP.start('api.hostip.info') do |http|
-        country = http.get("/country.php?ip=#{ip_address}").body
-        country = "GB" if country == "UK"
-        Net::HTTP.start('ws.geonames.org') do |http|
-          xml = REXML::Document.new(http.get("/countryInfo?country=#{country}").body)
-          xml.elements.each("geonames/country") do |ele|
-            minlon = ele.get_text("bBoxWest").to_s
-            minlat = ele.get_text("bBoxSouth").to_s
-            maxlon = ele.get_text("bBoxEast").to_s
-            maxlat = ele.get_text("bBoxNorth").to_s
-            return { :minlon => minlon, :minlat => minlat, :maxlon => maxlon, :maxlat => maxlat }
-          end
-        end
+      doc.encoding = XML::Encoding::UTF_8
+      root = XML::Node.new "osm"
+      xml_root_attributes.each do |k, v|
+        root[k] = v
       end
+      doc.root = root
+      doc
     end
 
-    return nil
-  rescue Exception
-    return nil
+    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 = 30)
-    chars = 'abcdefghijklmnopqrtuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
-    token = ''
+    chars = "abcdefghijklmnopqrtuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
+    token = ""
 
     length.times do
       token += chars[(rand * chars.length).to_i].chr
     end
 
-    return token
+    token
   end
 
-  # Return an encrypted version of a password
-  def self.encrypt_password(password, salt)
-    return Digest::MD5.hexdigest(password) if salt.nil?
-    return Digest::MD5.hexdigest(salt + password)
+  # 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 an SQL fragment to select a given area of the globe
-  def self.sql_for_area(minlat, minlon, maxlat, maxlon, prefix = nil)
-    tilesql = QuadTile.sql_for_area(minlat, minlon, maxlat, maxlon, prefix)
-    minlat = (minlat * 10000000).round
-    minlon = (minlon * 10000000).round
-    maxlat = (maxlat * 10000000).round
-    maxlon = (maxlon * 10000000).round
-
-    return "#{tilesql} AND #{prefix}latitude BETWEEN #{minlat} AND #{maxlat} AND #{prefix}longitude BETWEEN #{minlon} AND #{maxlon}"
+  # 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
+  end
+
+  # Return the MaxMindDB database handle
+  def self.maxmind_database
+    @maxmind_database ||= MaxMindDB.new(Settings.maxmind_database) if Settings.key?(:maxmind_database)
   end
 end