X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/43c411ec1441ee1710dc33389d7451f7414a170f..e537bd8dd1ac786164f192374e0d076bdc0327f3:/services/api/app/models/arvados_model.rb

diff --git a/services/api/app/models/arvados_model.rb b/services/api/app/models/arvados_model.rb
index a4a0148d84..c87a909e06 100644
--- a/services/api/app/models/arvados_model.rb
+++ b/services/api/app/models/arvados_model.rb
@@ -1,47 +1,140 @@
+require 'assign_uuid'
 class ArvadosModel < ActiveRecord::Base
   self.abstract_class = true
 
   include CurrentApiClient      # current_user, current_api_client, etc.
 
   attr_protected :created_at
-  attr_protected :modified_by_user
-  attr_protected :modified_by_client
+  attr_protected :modified_by_user_uuid
+  attr_protected :modified_by_client_uuid
   attr_protected :modified_at
+  after_initialize :log_start_state
   before_create :ensure_permission_to_create
   before_update :ensure_permission_to_update
+  before_destroy :ensure_permission_to_destroy
+
   before_create :update_modified_by_fields
   before_update :maybe_update_modified_by_fields
+  after_create :log_create
+  after_update :log_update
+  after_destroy :log_destroy
   validate :ensure_serialized_attribute_type
+  validate :normalize_collection_uuids
+  validate :ensure_valid_uuids
+
+  has_many :permissions, :foreign_key => :head_uuid, :class_name => 'Link', :primary_key => :uuid, :conditions => "link_class = 'permission'"
+
+  class PermissionDeniedError < StandardError
+    def http_status
+      403
+    end
+  end
+
+  class UnauthorizedError < StandardError
+    def http_status
+      401
+    end
+  end
 
   def self.kind_class(kind)
-    kind.match(/^arvados\#(.+?)(_list|List)?$/)[1].pluralize.classify.constantize rescue nil
-  end
-
-  def eager_load_associations
-    self.class.columns.each do |col|
-      re = col.name.match /^(.*)_kind$/
-      if (re and
-          self.respond_to? re[1].to_sym and
-          (auuid = self.send((re[1] + '_uuid').to_sym)) and
-          (aclass = self.class.kind_class(self.send(col.name.to_sym))) and
-          (aobject = aclass.where('uuid=?', auuid).first))
-        self.instance_variable_set('@'+re[1], aobject)
+    kind.match(/^arvados\#(.+)$/)[1].classify.safe_constantize rescue nil
+  end
+
+  def href
+    "#{current_api_base}/#{self.class.to_s.pluralize.underscore}/#{self.uuid}"
+  end
+
+  def self.searchable_columns operator
+    textonly_operator = !operator.match(/[<=>]/)
+    self.columns.collect do |col|
+      if col.name == 'owner_uuid'
+        nil
+      elsif [:string, :text].index(col.type)
+        col.name
+      elsif !textonly_operator and [:datetime, :integer].index(col.type)
+        col.name
       end
+    end.compact
+  end
+
+  def self.attribute_column attr
+    self.columns.select { |col| col.name == attr.to_s }.first
+  end
+
+  # def eager_load_associations
+  #   self.class.columns.each do |col|
+  #     re = col.name.match /^(.*)_kind$/
+  #     if (re and
+  #         self.respond_to? re[1].to_sym and
+  #         (auuid = self.send((re[1] + '_uuid').to_sym)) and
+  #         (aclass = self.class.kind_class(self.send(col.name.to_sym))) and
+  #         (aobject = aclass.where('uuid=?', auuid).first))
+  #       self.instance_variable_set('@'+re[1], aobject)
+  #     end
+  #   end
+  # end
+
+  def self.readable_by user
+    uuid_list = [user.uuid, *user.groups_i_can(:read)]
+    sanitized_uuid_list = uuid_list.
+      collect { |uuid| sanitize(uuid) }.join(', ')
+    or_references_me = ''
+
+    if self == User
+      or_row_is_me = "OR (#{table_name}.uuid=#{sanitize user.uuid})"
     end
+
+    if self == Link
+      or_references_me = "OR (#{table_name}.link_class in (#{sanitize 'permission'}, #{sanitize 'resources'}) AND #{sanitize user.uuid} IN (#{table_name}.head_uuid, #{table_name}.tail_uuid))"
+    end
+
+    if self == Log
+      or_object_uuid = ", #{table_name}.object_uuid"
+      or_object_owner = "OR (#{table_name}.object_owner_uuid in (#{sanitized_uuid_list}))"
+    end
+
+    # Link head points to this row, or to the owner of this row (the thing to be read)
+    # (or the object described by this row, for logs table only)
+    # Link tail originates from this user, or a group that is readable by this
+    # user (the identity with authorization to read)
+    # Link is any permission link ('write' and 'manage' implicitly include 'read')
+    # The existence of such a link is tested in the where clause as permissions.head_uuid IS NOT NULL.
+    # or
+    # User is admin
+    # or
+    # This row is owned by this user, or owned by a group readable by this user
+    # or
+    # This is the users table
+    # This row uuid is equal this user uuid
+    # or
+    # This is the links table
+    # This row is a permission link
+    # The current user is referenced in either the head or tail of the link
+    # or
+    # This is the logs table
+    # This object described by this row is owned by this user, or owned by a group readable by this user
+
+    joins("LEFT JOIN links permissions ON permissions.head_uuid in (#{table_name}.owner_uuid, #{table_name}.uuid #{or_object_uuid}) AND permissions.tail_uuid in (#{sanitized_uuid_list}) AND permissions.link_class='permission'").
+      where("permissions.head_uuid IS NOT NULL OR ?=? OR #{table_name}.owner_uuid in (?) #{or_row_is_me} #{or_references_me} #{or_object_owner}",
+            user.is_admin, true, uuid_list).uniq
+  end
+
+  def logged_attributes
+    attributes
   end
 
   protected
 
   def ensure_permission_to_create
-    raise "Permission denied" unless permission_to_create
+    raise PermissionDeniedError unless permission_to_create
   end
 
   def permission_to_create
-    current_user
+    current_user.andand.is_active
   end
 
   def ensure_permission_to_update
-    raise "Permission denied" unless permission_to_update
+    raise PermissionDeniedError unless permission_to_update
   end
 
   def permission_to_update
@@ -49,41 +142,53 @@ class ArvadosModel < ActiveRecord::Base
       logger.warn "Anonymous user tried to update #{self.class.to_s} #{self.uuid_was}"
       return false
     end
+    if !current_user.is_active
+      logger.warn "Inactive user #{current_user.uuid} tried to update #{self.class.to_s} #{self.uuid_was}"
+      return false
+    end
+    return true if current_user.is_admin
     if self.uuid_changed?
       logger.warn "User #{current_user.uuid} tried to change uuid of #{self.class.to_s} #{self.uuid_was} to #{self.uuid}"
       return false
     end
-    return true if current_user.is_admin
-    if self.owner_changed?
-      if current_user.uuid == self.owner or
-          current_user.can? write: self.owner
+    if self.owner_uuid_changed?
+      if current_user.uuid == self.owner_uuid or
+          current_user.can? write: self.owner_uuid
         # current_user is, or has :write permission on, the new owner
       else
-        logger.warn "User #{current_user.uuid} tried to change owner of #{self.class.to_s} #{self.uuid} to #{self.owner} but does not have permission to write to #{self.owner}"
+        logger.warn "User #{current_user.uuid} tried to change owner_uuid of #{self.class.to_s} #{self.uuid} to #{self.owner_uuid} but does not have permission to write to #{self.owner_uuid}"
         return false
       end
     end
-    if current_user.uuid == self.owner_was or
+    if current_user.uuid == self.owner_uuid_was or
         current_user.uuid == self.uuid or
-        current_user.can? write: self.owner_was
+        current_user.can? write: self.owner_uuid_was
       # current user is, or has :write permission on, the previous owner
       return true
     else
-      logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_was}"
+      logger.warn "User #{current_user.uuid} tried to modify #{self.class.to_s} #{self.uuid} but does not have permission to write #{self.owner_uuid_was}"
       return false
     end
   end
 
+  def ensure_permission_to_destroy
+    raise PermissionDeniedError unless permission_to_destroy
+  end
+
+  def permission_to_destroy
+    permission_to_update
+  end
+
   def maybe_update_modified_by_fields
-    update_modified_by_fields if self.changed?
+    update_modified_by_fields if self.changed? or self.new_record?
   end
 
   def update_modified_by_fields
-    self.created_at ||= Time.now
-    self.owner ||= current_default_owner
+    self.updated_at = Time.now
+    self.owner_uuid ||= current_default_owner if self.respond_to? :owner_uuid=
     self.modified_at = Time.now
-    self.modified_by_user = current_user ? current_user.uuid : nil
-    self.modified_by_client = current_api_client ? current_api_client.uuid : nil
+    self.modified_by_user_uuid = current_user ? current_user.uuid : nil
+    self.modified_by_client_uuid = current_api_client ? current_api_client.uuid : nil
   end
 
   def ensure_serialized_attribute_type
@@ -101,4 +206,147 @@ class ArvadosModel < ActiveRecord::Base
       end
     end
   end
+
+  def foreign_key_attributes
+    attributes.keys.select { |a| a.match /_uuid$/ }
+  end
+
+  def skip_uuid_read_permission_check
+    %w(modified_by_client_uuid)
+  end
+
+  def skip_uuid_existence_check
+    []
+  end
+
+  def normalize_collection_uuids
+    foreign_key_attributes.each do |attr|
+      attr_value = send attr
+      if attr_value.is_a? String and
+          attr_value.match /^[0-9a-f]{32,}(\+[@\w]+)*$/
+        begin
+          send "#{attr}=", Collection.normalize_uuid(attr_value)
+        rescue
+          # TODO: abort instead of silently accepting unnormalizable value?
+        end
+      end
+    end
+  end
+
+  @@UUID_REGEX = /^[0-9a-z]{5}-([0-9a-z]{5})-[0-9a-z]{15}$/
+
+  @@prefixes_hash = nil
+  def self.uuid_prefixes
+    unless @@prefixes_hash
+      @@prefixes_hash = {}
+      ActiveRecord::Base.descendants.reject(&:abstract_class?).each do |k|
+        if k.respond_to?(:uuid_prefix)
+          @@prefixes_hash[k.uuid_prefix] = k
+        end
+      end
+    end
+    @@prefixes_hash
+  end
+
+  def self.uuid_like_pattern
+    "_____-#{uuid_prefix}-_______________"
+  end
+
+  def ensure_valid_uuids
+    specials = [system_user_uuid, 'd41d8cd98f00b204e9800998ecf8427e+0']
+
+    foreign_key_attributes.each do |attr|
+      if new_record? or send (attr + "_changed?")
+        next if skip_uuid_existence_check.include? attr
+        attr_value = send attr
+        next if specials.include? attr_value
+        if attr_value
+          if (r = ArvadosModel::resource_class_for_uuid attr_value)
+            unless skip_uuid_read_permission_check.include? attr
+              r = r.readable_by(current_user)
+            end
+            if r.where(uuid: attr_value).count == 0
+              errors.add(attr, "'#{attr_value}' not found")
+            end
+          end
+        end
+      end
+    end
+  end
+
+  class Email
+    def self.kind
+      "email"
+    end
+
+    def kind
+      self.class.kind
+    end
+
+    def self.readable_by (u)
+      self
+    end
+
+    def self.where (u)
+      [{:uuid => u[:uuid]}]
+    end
+  end
+
+  def self.resource_class_for_uuid(uuid)
+    if uuid.is_a? ArvadosModel
+      return uuid.class
+    end
+    unless uuid.is_a? String
+      return nil
+    end
+    if uuid.match /^[0-9a-f]{32}(\+[^,]+)*(,[0-9a-f]{32}(\+[^,]+)*)*$/
+      return Collection
+    end
+    resource_class = nil
+
+    Rails.application.eager_load!
+    uuid.match @@UUID_REGEX do |re|
+      return uuid_prefixes[re[1]] if uuid_prefixes[re[1]]
+    end
+
+    if uuid.match /.+@.+/
+      return Email
+    end
+
+    nil
+  end
+
+  def log_start_state
+    @old_etag = etag
+    @old_attributes = logged_attributes
+  end
+
+  def log_change(event_type)
+    log = Log.new(event_type: event_type).fill_object(self)
+    yield log
+    log.save!
+    connection.execute "NOTIFY logs, '#{log.id}'"
+    log_start_state
+  end
+
+  def log_create
+    log_change('create') do |log|
+      log.fill_properties('old', nil, nil)
+      log.update_to self
+    end
+  end
+
+  def log_update
+    log_change('update') do |log|
+      log.fill_properties('old', @old_etag, @old_attributes)
+      log.update_to self
+    end
+  end
+
+  def log_destroy
+    log_change('destroy') do |log|
+      log.fill_properties('old', @old_etag, @old_attributes)
+      log.update_to nil
+    end
+  end
 end