X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/8bd09c082897d808c4641f94836f5cfa4cbbf95c..c3b17aa506d6d7347f438de73de746d087cd0d19:/app/controllers/api_controller.rb

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 7451a91b9..17c98fe8b 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,105 +1,173 @@
 class ApiController < ApplicationController
-
-  before_filter :authorize
-  after_filter :compress_output
-
-  helper :user
-  model :user
-
-  def authorize_web
-    @current_user = User.find_by_token(session[:token])
-  end
-  
-  # The maximum area you're allowed to request, in square degrees
-  MAX_REQUEST_AREA = 0.25
-
-  def map
-    response.headers["Content-Type"] = 'text/xml'
-    # Figure out the bbox
-    bbox = params['bbox']
-    unless bbox and bbox.count(',') == 3
-       report_error("The parameter bbox is required, and must be of the form min_lon,min_lat,max_lon,max_lat")
-      return
+  skip_before_action :verify_authenticity_token
+
+  before_action :check_api_readable
+
+  around_action :api_call_handle_error, :api_call_timeout
+
+  private
+
+  ##
+  # Set allowed request formats if no explicit format has been
+  # requested via a URL suffix. Allowed formats are taken from
+  # any HTTP Accept header with XML as the default.
+  def set_request_formats
+    unless params[:format]
+      accept_header = request.headers["HTTP_ACCEPT"]
+
+      if accept_header
+        # Some clients (such asJOSM) send Accept headers which cannot be
+        # parse by Rails, for example:
+        #
+        #   Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
+        #
+        # where both "*" and ".2" as a quality do not adhere to the syntax
+        # described in RFC 7231, section 5.3.1, etc.
+        #
+        # As a workaround, and for back compatibility, default to XML format.
+        mimetypes = begin
+          Mime::Type.parse(accept_header)
+        rescue Mime::Type::InvalidMimeType
+          Array(Mime[:xml])
+        end
+
+        # Allow XML and JSON formats, and treat an all formats wildcard
+        # as XML for backwards compatibility - all other formats are discarded
+        # which will result in a 406 Not Acceptable response being sent
+        formats = mimetypes.map do |mime|
+          if mime.symbol == :xml || mime == "*/*" then :xml
+          elsif mime.symbol == :json then :json
+          end
+        end
+      else
+        # Default to XML if no accept header was sent - this includes
+        # the unit tests which don't set one by default
+        formats = Array(:xml)
+      end
+
+      request.formats = formats.compact
     end
+  end
 
-    bbox = bbox.split(',')
+  def authorize(errormessage = "Couldn't authenticate you")
+    # make the current_user object from any auth sources we have
+    setup_user_auth
 
-    min_lon = bbox[0].to_f
-    min_lat = bbox[1].to_f
-    max_lon = bbox[2].to_f
-    max_lat = bbox[3].to_f
+    # handle authenticate pass/fail
+    unless current_user
+      # no auth, the user does not exist or the password was wrong
+      render :plain => errormessage, :status => :unauthorized
 
-    # check the bbox is sane
-    unless min_lon <= max_lon
-       report_error("The minimum longitude must be less than the maximum longitude, but it wasn't")
-      return
-    end
-    unless min_lat <= max_lat
-       report_error("The minimum latitude must be less than the maximum latitude, but it wasn't")
-      return
+      false
     end
-	unless min_lon >= -180 && min_lat >= -90 && max_lon <= 180 && max_lat <= 90
-       report_error("The latitudes must be between -90 and 90, and longitudes between -180 and 180")
-      return
-	end
-
-    # check the bbox isn't too large
-    requested_area = (max_lat-min_lat)*(max_lon-min_lon)
-    if requested_area > MAX_REQUEST_AREA
-       report_error("The maximum bbox size is " + MAX_REQUEST_AREA.to_s + ", and your request was too large. Either request a smaller area, or use planet.osm")
-      return
-    end
-
-    # get all the nodes
-    nodes = Node.find(:all, :conditions => ['latitude > ? AND longitude > ? AND latitude < ? AND longitude < ? AND visible = 1', min_lat, min_lon, max_lat, max_lon])
-
-    node_ids = nodes.collect {|node| node.id }
-
-    # (in the future, we may wish to abort here if we found too many nodes)
+  end
 
-    # grab the segments
-    segments = Array.new
-    if node_ids.length > 0
-      node_ids_sql = "(#{node_ids.join(',')})"
-      # get the referenced segments
-      segments = Segment.find_by_sql "select * from current_segments where visible = 1 and (node_a in #{node_ids_sql} or node_b in #{node_ids_sql})"
+  def current_ability
+    # Use capabilities from the oauth token if it exists and is a valid access token
+    if doorkeeper_token&.accessible?
+      ApiAbility.new(nil).merge(ApiCapability.new(doorkeeper_token))
+    else
+      ApiAbility.new(current_user)
     end
-    # see if we have any missing nodes
-    segments_nodes = segments.collect {|segment| segment.node_a }
-    segments_nodes += segments.collect {|segment| segment.node_b }
-
-    segments_nodes.uniq!
-
-    missing_nodes = segments_nodes - node_ids
-
-    # get missing nodes if there are any
-    nodes += Node.find(missing_nodes) if missing_nodes.length > 0
-
-    doc = OSM::API.new.get_xml_doc
+  end
 
-    # get ways
-    # find which ways are needed
-    segment_ids = segments.collect {|segment| segment.id }
-    ways = Array.new
-    if segment_ids.length > 0
-      way_segments = WaySegment.find_all_by_segment_id(segment_ids)
-      way_ids = way_segments.collect {|way_segment| way_segment.id }
-      ways = Way.find(way_ids) # NB: doesn't pick up segments, tags from db until accessed via way.way_segments etc.
+  def deny_access(_exception)
+    if doorkeeper_token
+      set_locale
+      report_error t("oauth.permissions.missing"), :forbidden
+    elsif current_user
+      head :forbidden
+    else
+      head :unauthorized
     end
+  end
 
-    nodes.each do |node|
-      doc.root << node.to_xml_node()
+  def gpx_status
+    status = database_status
+    status = "offline" if status == "online" && Settings.status == "gpx_offline"
+    status
+  end
+
+  ##
+  # sets up the current_user for use by other methods. this is mostly called
+  # from the authorize method, but can be called elsewhere if authorisation
+  # is optional.
+  def setup_user_auth
+    logger.info " setup_user_auth"
+    # try and setup using OAuth
+    self.current_user = User.find(doorkeeper_token.resource_owner_id) if doorkeeper_token&.accessible?
+
+    # have we identified the user?
+    if current_user
+      # check if the user has been banned
+      user_block = current_user.blocks.active.take
+      unless user_block.nil?
+        set_locale
+        if user_block.zero_hour?
+          report_error t("application.setup_user_auth.blocked_zero_hour"), :forbidden
+        else
+          report_error t("application.setup_user_auth.blocked"), :forbidden
+        end
+      end
+
+      # if the user hasn't seen the contributor terms then don't
+      # allow editing - they have to go to the web site and see
+      # (but can decline) the CTs to continue.
+      if !current_user.terms_seen && flash[:skip_terms].nil?
+        set_locale
+        report_error t("application.setup_user_auth.need_to_see_terms"), :forbidden
+      end
     end
+  end
 
-    segments.each do |segment|
-      doc.root << segment.to_xml_node()
-    end 
+  def api_call_handle_error
+    yield
+  rescue ActionController::UnknownFormat
+    head :not_acceptable
+  rescue ActiveRecord::RecordNotFound => e
+    head :not_found
+  rescue LibXML::XML::Error, ArgumentError => e
+    report_error e.message, :bad_request
+  rescue ActiveRecord::RecordInvalid => e
+    message = "#{e.record.class} #{e.record.id}: "
+    e.record.errors.each { |error| message << "#{error.attribute}: #{error.message} (#{e.record[error.attribute].inspect})" }
+    report_error message, :bad_request
+  rescue OSM::APIError => e
+    report_error e.message, e.status
+  rescue AbstractController::ActionNotFound, CanCan::AccessDenied => e
+    raise
+  rescue StandardError => e
+    logger.info("API threw unexpected #{e.class} exception: #{e.message}")
+    e.backtrace.each { |l| logger.info(l) }
+    report_error "#{e.class}: #{e.message}", :internal_server_error
+  end
 
-    ways.each do |way|
-      doc.root << way.to_xml_node()
-    end 
+  ##
+  # wrap an api call in a timeout
+  def api_call_timeout(&)
+    Timeout.timeout(Settings.api_timeout, &)
+  rescue ActionView::Template::Error => e
+    e = e.cause
+
+    if e.is_a?(Timeout::Error) ||
+       (e.is_a?(ActiveRecord::StatementInvalid) && e.message.include?("execution expired"))
+      ActiveRecord::Base.connection.raw_connection.cancel
+      raise OSM::APITimeoutError
+    else
+      raise
+    end
+  rescue Timeout::Error
+    ActiveRecord::Base.connection.raw_connection.cancel
+    raise OSM::APITimeoutError
+  end
 
-    render :text => doc.to_s
+  ##
+  # check the api change rate limit
+  def check_rate_limit(new_changes = 1)
+    max_changes = ActiveRecord::Base.connection.select_value(
+      "SELECT api_rate_limit($1)", "api_rate_limit", [current_user.id]
+    )
 
+    raise OSM::APIRateLimitExceeded if new_changes > max_changes
   end
 end