X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/93da9596997444baa576e296e371065a3cb99eb3..c3b17aa506d6d7347f438de73de746d087cd0d19:/app/controllers/api_controller.rb

diff --git a/app/controllers/api_controller.rb b/app/controllers/api_controller.rb
index 64514a432..17c98fe8b 100644
--- a/app/controllers/api_controller.rb
+++ b/app/controllers/api_controller.rb
@@ -1,91 +1,84 @@
 class ApiController < ApplicationController
   skip_before_action :verify_authenticity_token
 
+  before_action :check_api_readable
+
+  around_action :api_call_handle_error, :api_call_timeout
+
   private
 
   ##
-  # Set default request format to xml unless a client requests a specific format,
-  # which can be done via (a) URL suffix and/or (b) HTTP Accept header, where
-  # the URL suffix always takes precedence over the Accept header.
-  def set_default_request_format
+  # 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.nil?
-        # e.g. unit tests don't set an Accept: header by default, force XML in this case
-        request.format = "xml"
-        return
-      end
-
-      req_mimetypes = []
-
-      # Some clients (JOSM) send Accept headers which cannot be parsed by Rails, example: *; q=.2
-      # To be fair, JOSM's Accept header doesn't adhere to RFC 7231, section 5.3.1, et al. either
-      # As a workaround for backwards compatibility, we're assuming XML format
-      begin
-        req_mimetypes = Mime::Type.parse(accept_header)
-      rescue Mime::Type::InvalidMimeType
-        request.format = "xml"
-        return
-      end
 
-      # req_mimetypes contains all Accept header MIME types with descending priority
-      req_mimetypes.each do |mime|
-        if mime.symbol == :xml
-          request.format = "xml"
-          break
+      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
 
-        if mime.symbol == :json
-          request.format = "json"
-          break
+        # 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
-
-        # Any format, not explicitly requesting XML or JSON -> assume XML as default
-        if mime == "*/*"
-          request.format = "xml"
-          break
-        end
-
-        # In case the client requests some other format besides XML, JSON and */*,
-        # we deliberately don't set request.format. The framework will return an
-        # ActionController::UnknownFormat error to the client later on in this case.
+      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
 
-  def authorize(realm = "Web Password", errormessage = "Couldn't authenticate you")
+  def authorize(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
-      response.headers["WWW-Authenticate"] = "Basic realm=\"#{realm}\""
       render :plain => errormessage, :status => :unauthorized
+
       false
     end
   end
 
   def current_ability
     # Use capabilities from the oauth token if it exists and is a valid access token
-    if Authenticator.new(self, [:token]).allow?
-      ApiAbility.new(nil).merge(ApiCapability.new(current_token))
+    if doorkeeper_token&.accessible?
+      ApiAbility.new(nil).merge(ApiCapability.new(doorkeeper_token))
     else
       ApiAbility.new(current_user)
     end
   end
 
   def deny_access(_exception)
-    if current_token
+    if doorkeeper_token
       set_locale
       report_error t("oauth.permissions.missing"), :forbidden
     elsif current_user
       head :forbidden
     else
-      realm = "Web Password"
-      errormessage = "Couldn't authenticate you"
-      response.headers["WWW-Authenticate"] = "Basic realm=\"#{realm}\""
-      render :plain => errormessage, :status => :unauthorized
+      head :unauthorized
     end
   end
 
@@ -100,18 +93,9 @@ class ApiController < ApplicationController
   # 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
-    unless Authenticator.new(self, [:token]).allow?
-      username, passwd = get_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
-    end
+    self.current_user = User.find(doorkeeper_token.resource_owner_id) if doorkeeper_token&.accessible?
 
     # have we identified the user?
     if current_user
@@ -135,4 +119,55 @@ class ApiController < ApplicationController
       end
     end
   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
+
+  ##
+  # 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
+
+  ##
+  # 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