X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/317b8f9d45b25c4060bda337edfb73594834d275..8fb45ef0fddee05d8fa3829303f61226764bd91a:/app/controllers/api_controller.rb

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 8f9cb6adc..75db7f73b 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,167 +1,205 @@
 class ApiController < ApplicationController
   skip_before_action :verify_authenticity_token
-  before_action :api_deny_access_handler
-
-  authorize_resource :class => false
-
-  before_action :check_api_readable
-  before_action :setup_user_auth, :only => [:permissions]
-  around_action :api_call_handle_error, :api_call_timeout
-
-  # This is probably the most common call of all. It is used for getting the
-  # OSM data for a specified bounding box, usually for editing. First the
-  # bounding box (bbox) is checked to make sure that it is sane. All nodes
-  # are searched, then all the ways that reference those nodes are found.
-  # All Nodes that are referenced by those ways are fetched and added to the list
-  # of nodes.
-  # Then all the relations that reference the already found nodes and ways are
-  # fetched. All the nodes and ways that are referenced by those ways are then
-  # fetched. Finally all the xml is returned.
-  def map
-    # Figure out the bbox
-    # check boundary is sane and area within defined
-    # see /config/application.yml
-    begin
-      bbox = BoundingBox.from_bbox_params(params)
-      bbox.check_boundaries
-      bbox.check_size
-    rescue StandardError => err
-      report_error(err.message)
-      return
-    end
-
-    nodes = Node.bbox(bbox).where(:visible => true).includes(:node_tags).limit(MAX_NUMBER_OF_NODES + 1)
-
-    node_ids = nodes.collect(&:id)
-    if node_ids.length > MAX_NUMBER_OF_NODES
-      report_error("You requested too many nodes (limit is #{MAX_NUMBER_OF_NODES}). Either request a smaller area, or use planet.osm")
-      return
-    end
-
-    doc = OSM::API.new.get_xml_doc
 
-    # add bounds
-    doc.root << bbox.add_bounds_to(XML::Node.new("bounds"))
-
-    # get ways
-    # find which ways are needed
-    ways = []
-    if node_ids.empty?
-      list_of_way_nodes = []
-    else
-      way_nodes = WayNode.where(:node_id => node_ids)
-      way_ids = way_nodes.collect { |way_node| way_node.id[0] }
-      ways = Way.preload(:way_nodes, :way_tags).find(way_ids)
-
-      list_of_way_nodes = ways.collect do |way|
-        way.way_nodes.collect(&:node_id)
+  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
-      list_of_way_nodes.flatten!
-    end
 
-    # - [0] in case some thing links to node 0 which doesn't exist. Shouldn't actually ever happen but it does. FIXME: file a ticket for this
-    nodes_to_fetch = (list_of_way_nodes.uniq - node_ids) - [0]
-
-    nodes += Node.includes(:node_tags).find(nodes_to_fetch) unless nodes_to_fetch.empty?
-
-    visible_nodes = {}
-    changeset_cache = {}
-    user_display_name_cache = {}
-
-    nodes.each do |node|
-      if node.visible?
-        doc.root << node.to_xml_node(changeset_cache, user_display_name_cache)
-        visible_nodes[node.id] = node
-      end
+      request.formats = formats.compact
     end
+  end
 
-    way_ids = []
-    ways.each do |way|
-      if way.visible?
-        doc.root << way.to_xml_node(visible_nodes, changeset_cache, user_display_name_cache)
-        way_ids << way.id
+  def authorize(realm = "Web Password", errormessage = "Couldn't authenticate you")
+    # make the current_user object from any auth sources we have
+    setup_user_auth
+
+    # handle authenticate pass/fail
+    unless current_user
+      # no auth, the user does not exist or the password was wrong
+      if Settings.basic_auth_support
+        response.headers["WWW-Authenticate"] = "Basic realm=\"#{realm}\""
+        render :plain => errormessage, :status => :unauthorized
+      else
+        render :plain => errormessage, :status => :forbidden
       end
-    end
-
-    relations = Relation.nodes(visible_nodes.keys).visible +
-                Relation.ways(way_ids).visible
-
-    # we do not normally return the "other" partners referenced by an relation,
-    # e.g. if we return a way A that is referenced by relation X, and there's
-    # another way B also referenced, that is not returned. But we do make
-    # an exception for cases where an relation references another *relation*;
-    # in that case we return that as well (but we don't go recursive here)
-    relations += Relation.relations(relations.collect(&:id)).visible
 
-    # this "uniq" may be slightly inefficient; it may be better to first collect and output
-    # all node-related relations, then find the *not yet covered* way-related ones etc.
-    relations.uniq.each do |relation|
-      doc.root << relation.to_xml_node(changeset_cache, user_display_name_cache)
+      false
     end
-
-    response.headers["Content-Disposition"] = "attachment; filename=\"map.osm\""
-
-    render :xml => doc.to_s
   end
 
-  # Get a list of the tiles that have changed within a specified time
-  # period
-  def changes
-    zoom = (params[:zoom] || "12").to_i
-
-    if params.include?(:start) && params.include?(:end)
-      starttime = Time.parse(params[:start])
-      endtime = Time.parse(params[:end])
+  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))
+    elsif Authenticator.new(self, [:token]).allow?
+      ApiAbility.new(nil).merge(ApiCapability.new(current_token))
     else
-      hours = (params[:hours] || "1").to_i.hours
-      endtime = Time.now.getutc
-      starttime = endtime - hours
+      ApiAbility.new(current_user)
     end
+  end
 
-    if zoom >= 1 && zoom <= 16 &&
-       endtime > starttime && endtime - starttime <= 24.hours
-      mask = (1 << zoom) - 1
-
-      tiles = Node.where(:timestamp => starttime..endtime).group("maptile_for_point(latitude, longitude, #{zoom})").count
+  def deny_access(_exception)
+    if doorkeeper_token || current_token
+      set_locale
+      report_error t("oauth.permissions.missing"), :forbidden
+    elsif current_user
+      head :forbidden
+    elsif Settings.basic_auth_support
+      realm = "Web Password"
+      errormessage = "Couldn't authenticate you"
+      response.headers["WWW-Authenticate"] = "Basic realm=\"#{realm}\""
+      render :plain => errormessage, :status => :unauthorized
+    else
+      render :plain => errormessage, :status => :forbidden
+    end
+  end
 
-      doc = OSM::API.new.get_xml_doc
-      changes = XML::Node.new "changes"
-      changes["starttime"] = starttime.xmlschema
-      changes["endtime"] = endtime.xmlschema
+  def gpx_status
+    status = database_status
+    status = "offline" if status == "online" && Settings.status == "gpx_offline"
+    status
+  end
 
-      tiles.each do |tile, count|
-        x = (tile.to_i >> zoom) & mask
-        y = tile.to_i & mask
+  ##
+  # 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
+    if doorkeeper_token&.accessible?
+      self.current_user = User.find(doorkeeper_token.resource_owner_id)
+    elsif Authenticator.new(self, [:token]).allow?
+      # self.current_user setup by OAuth
+    elsif Settings.basic_auth_support
+      username, passwd = auth_data # parse from headers
+      # authenticate per-scheme
+      self.current_user = if username.nil?
+                            nil # no authentication provided - perhaps first connect (client should retry after 401)
+                          elsif username == "token"
+                            User.authenticate(:token => passwd) # preferred - random token for user from db, passed in basic auth
+                          else
+                            User.authenticate(:username => username, :password => passwd) # basic auth
+                          end
+      # log if we have authenticated using basic auth
+      logger.info "Authenticated as user #{current_user.id} using basic authentication" if current_user
+    end
 
-        t = XML::Node.new "tile"
-        t["x"] = x.to_s
-        t["y"] = y.to_s
-        t["z"] = zoom.to_s
-        t["changes"] = count.to_s
+    # 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
 
-        changes << t
+      # 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
 
-      doc.root << changes
+  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 => 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
+
+  ##
+  # asserts that the request method is the +method+ given as a parameter
+  # or raises a suitable error. +method+ should be a symbol, e.g: :put or :get.
+  def assert_method(method)
+    ok = request.send(:"#{method.to_s.downcase}?")
+    raise OSM::APIBadMethodError, method unless ok
+  end
 
-      render :xml => doc.to_s
+  ##
+  # wrap an api call in a timeout
+  def api_call_timeout(&block)
+    Timeout.timeout(Settings.api_timeout, &block)
+  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
-      render :plain => "Requested zoom is invalid, or the supplied start is after the end time, or the start duration is more than 24 hours", :status => :bad_request
+      raise
     end
+  rescue Timeout::Error
+    ActiveRecord::Base.connection.raw_connection.cancel
+    raise OSM::APITimeoutError
   end
 
-  # External apps that use the api are able to query which permissions
-  # they have. This currently returns a list of permissions granted to the current user:
-  # * if authenticated via OAuth, this list will contain all permissions granted by the user to the access_token.
-  # * if authenticated via basic auth all permissions are granted, so the list will contain all permissions.
-  # * unauthenticated users have no permissions, so the list will be empty.
-  def permissions
-    @permissions = if current_token.present?
-                     ClientApplication.all_permissions.select { |p| current_token.read_attribute(p) }
-                   elsif current_user
-                     ClientApplication.all_permissions
-                   else
-                     []
-                   end
+  ##
+  # 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