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Set snowflake IDs for backdated statuses (#5260) 

- Rename Mastodon::TimestampIds into Mastodon::Snowflake for clarity
- Skip for statuses coming from inbox, aka delivered in real-time
- Skip for statuses that claim to be from the future
This commit is contained in:
Eugen Rochko 2017-10-08 17:34:34 +02:00 committed by GitHub
parent 6e4046fc3f
commit 0717d9b3e6
16 changed files with 83 additions and 43 deletions
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7
app/lib/activitypub/activity.rb
View File

@ -3,10 +3,11 @@
class ActivityPub::Activity
include JsonLdHelper
def initialize(json, account)
def initialize(json, account, options = {})
@json = json
@account = account
@object = @json['object']
@options = options
end
def perform
@ -14,9 +15,9 @@ class ActivityPub::Activity
end
class << self
def factory(json, account)
def factory(json, account, options = {})
@json = json
klass&.new(json, account)
klass&.new(json, account, options)
end
private

3
app/lib/activitypub/activity/announce.rb
View File

@ -15,8 +15,9 @@ class ActivityPub::Activity::Announce < ActivityPub::Activity
account: @account,
reblog: original_status,
uri: @json['id'],
created_at: @json['published'] || Time.now.utc
created_at: @options[:override_timestamps] ? nil : @json['published']
)
distribute(status)
status
end

2
app/lib/activitypub/activity/create.rb
View File

@ -43,7 +43,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
text: text_from_content || '',
language: language_from_content,
spoiler_text: @object['summary'] || '',
created_at: @object['published'] || Time.now.utc,
created_at: @options[:override_timestamps] ? nil : @object['published'],
reply: @object['inReplyTo'].present?,
sensitive: @object['sensitive'] || false,
visibility: visibility_from_audience,

5
app/lib/ostatus/activity/base.rb
View File

@ -1,9 +1,10 @@
# frozen_string_literal: true
class OStatus::Activity::Base
def initialize(xml, account = nil)
@xml = xml
def initialize(xml, account = nil, options = {})
@xml = xml
@account = account
@options = options
end
def status?

2
app/lib/ostatus/activity/creation.rb
View File

@ -34,7 +34,7 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
reblog: cached_reblog,
text: content,
spoiler_text: content_warning,
created_at: published,
created_at: @options[:override_timestamps] ? nil : published,
reply: thread?,
language: content_language,
visibility: visibility_scope,

2
app/lib/ostatus/activity/general.rb
View File

@ -2,7 +2,7 @@
class OStatus::Activity::General < OStatus::Activity::Base
def specialize
special_class&.new(@xml, @account)
special_class&.new(@xml, @account, @options)
end
private

2
app/models/status.rb
View File

@ -136,6 +136,8 @@ class Status < ApplicationRecord
after_create :store_uri, if: :local?
around_create Mastodon::Snowflake::Callbacks
before_validation :prepare_contents, if: :local?
before_validation :set_reblog
before_validation :set_visibility

5
app/services/activitypub/process_collection_service.rb
View File

@ -3,9 +3,10 @@
class ActivityPub::ProcessCollectionService < BaseService
include JsonLdHelper
def call(body, account)
def call(body, account, options = {})
@account = account
@json = Oj.load(body, mode: :strict)
@options = options
return unless supported_context?
return if different_actor? && verify_account!.nil?
@ -38,7 +39,7 @@ class ActivityPub::ProcessCollectionService < BaseService
end
def process_item(item)
activity = ActivityPub::Activity.factory(item, @account)
activity = ActivityPub::Activity.factory(item, @account, @options)
activity&.perform
end

6
app/services/process_feed_service.rb
View File

@ -1,7 +1,9 @@
# frozen_string_literal: true
class ProcessFeedService < BaseService
def call(body, account)
def call(body, account, options = {})
@options = options
xml = Nokogiri::XML(body)
xml.encoding = 'utf-8'
@ -20,7 +22,7 @@ class ProcessFeedService < BaseService
end
def process_entry(xml, account)
activity = OStatus::Activity::General.new(xml, account)
activity = OStatus::Activity::General.new(xml, account, @options)
activity.specialize&.perform if activity.status?
rescue ActiveRecord::RecordInvalid => e
Rails.logger.debug "Nothing was saved for #{activity.id} because: #{e}"

2
app/workers/activitypub/processing_worker.rb
View File

@ -6,6 +6,6 @@ class ActivityPub::ProcessingWorker
sidekiq_options backtrace: true
def perform(account_id, body)
ActivityPub::ProcessCollectionService.new.call(body, Account.find(account_id))
ActivityPub::ProcessCollectionService.new.call(body, Account.find(account_id), override_timestamps: true)
end
end

2
app/workers/processing_worker.rb
View File

@ -6,6 +6,6 @@ class ProcessingWorker
sidekiq_options backtrace: true
def perform(account_id, body)
ProcessFeedService.new.call(body, Account.find(account_id))
ProcessFeedService.new.call(body, Account.find(account_id), override_timestamps: true)
end
end

1
config/application.rb
View File

@ -9,6 +9,7 @@ Bundler.require(*Rails.groups)
require_relative '../app/lib/exceptions'
require_relative '../lib/paperclip/gif_transcoder'
require_relative '../lib/paperclip/video_transcoder'
require_relative '../lib/mastodon/snowflake'
require_relative '../lib/mastodon/version'
Dotenv::Railtie.load

44
config/brakeman.ignore
View File

@ -57,26 +57,6 @@
"confidence": "Weak",
"note": ""
},
{
"warning_type": "SQL Injection",
"warning_code": 0,
"fingerprint": "34efc76883080f8b1110a30c34ec4f903946ee56651aae46c62477f45d4fc412",
"check_name": "SQL",
"message": "Possible SQL injection",
"file": "lib/mastodon/timestamp_ids.rb",
"line": 63,
"link": "http://brakemanscanner.org/docs/warning_types/sql_injection/",
"code": "connection.execute(\" CREATE OR REPLACE FUNCTION timestamp_id(table_name text)\\n RETURNS bigint AS\\n $$\\n DECLARE\\n time_part bigint;\\n sequence_base bigint;\\n tail bigint;\\n BEGIN\\n time_part := (\\n -- Get the time in milliseconds\\n ((date_part('epoch', now()) * 1000))::bigint\\n -- And shift it over two bytes\\n << 16);\\n\\n sequence_base := (\\n 'x' ||\\n -- Take the first two bytes (four hex characters)\\n substr(\\n -- Of the MD5 hash of the data we documented\\n md5(table_name ||\\n '#{SecureRandom.hex(16)}' ||\\n time_part::text\\n ),\\n 1, 4\\n )\\n -- And turn it into a bigint\\n )::bit(16)::bigint;\\n\\n -- Finally, add our sequence number to our base, and chop\\n -- it to the last two bytes\\n tail := (\\n (sequence_base + nextval(table_name || '_id_seq'))\\n & 65535);\\n\\n -- Return the time part and the sequence part. OR appears\\n -- faster here than addition, but they're equivalent:\\n -- time_part has no trailing two bytes, and tail is only\\n -- the last two bytes.\\n RETURN time_part | tail;\\n END\\n $$ LANGUAGE plpgsql VOLATILE;\\n\")",
"render_path": null,
"location": {
"type": "method",
"class": "Mastodon::TimestampIds",
"method": "define_timestamp_id"
},
"user_input": "SecureRandom.hex(16)",
"confidence": "Medium",
"note": ""
},
{
"warning_type": "Dynamic Render Path",
"warning_code": 15,
@ -106,7 +86,7 @@
"line": 3,
"link": "http://brakemanscanner.org/docs/warning_types/dynamic_render_path/",
"code": "render(action => \"stream_entries/#{Account.find_local!(params[:account_username]).statuses.find(params[:id]).stream_entry.activity_type.downcase}\", { Account.find_local!(params[:account_username]).statuses.find(params[:id]).stream_entry.activity_type.downcase.to_sym => Account.find_local!(params[:account_username]).statuses.find(params[:id]).stream_entry.activity, :centered => true })",
"render_path": [{"type":"controller","class":"StatusesController","method":"embed","line":35,"file":"app/controllers/statuses_controller.rb"}],
"render_path": [{"type":"controller","class":"StatusesController","method":"embed","line":41,"file":"app/controllers/statuses_controller.rb"}],
"location": {
"type": "template",
"template": "stream_entries/embed"
@ -153,6 +133,26 @@
"confidence": "Weak",
"note": ""
},
{
"warning_type": "SQL Injection",
"warning_code": 0,
"fingerprint": "9ccb9ba6a6947400e187d515e0bf719d22993d37cfc123c824d7fafa6caa9ac3",
"check_name": "SQL",
"message": "Possible SQL injection",
"file": "lib/mastodon/snowflake.rb",
"line": 86,
"link": "http://brakemanscanner.org/docs/warning_types/sql_injection/",
"code": "connection.execute(\" CREATE OR REPLACE FUNCTION timestamp_id(table_name text)\\n RETURNS bigint AS\\n $$\\n DECLARE\\n time_part bigint;\\n sequence_base bigint;\\n tail bigint;\\n BEGIN\\n time_part := (\\n -- Get the time in milliseconds\\n ((date_part('epoch', now()) * 1000))::bigint\\n -- And shift it over two bytes\\n << 16);\\n\\n sequence_base := (\\n 'x' ||\\n -- Take the first two bytes (four hex characters)\\n substr(\\n -- Of the MD5 hash of the data we documented\\n md5(table_name ||\\n '#{SecureRandom.hex(16)}' ||\\n time_part::text\\n ),\\n 1, 4\\n )\\n -- And turn it into a bigint\\n )::bit(16)::bigint;\\n\\n -- Finally, add our sequence number to our base, and chop\\n -- it to the last two bytes\\n tail := (\\n (sequence_base + nextval(table_name || '_id_seq'))\\n & 65535);\\n\\n -- Return the time part and the sequence part. OR appears\\n -- faster here than addition, but they're equivalent:\\n -- time_part has no trailing two bytes, and tail is only\\n -- the last two bytes.\\n RETURN time_part | tail;\\n END\\n $$ LANGUAGE plpgsql VOLATILE;\\n\")",
"render_path": null,
"location": {
"type": "method",
"class": "Mastodon::Snowflake",
"method": "define_timestamp_id"
},
"user_input": "SecureRandom.hex(16)",
"confidence": "Medium",
"note": ""
},
{
"warning_type": "Dynamic Render Path",
"warning_code": 15,
@ -269,6 +269,6 @@
"note": ""
}
],
"updated": "2017-10-06 03:27:46 +0200",
"updated": "2017-10-07 19:24:02 +0200",
"brakeman_version": "4.0.1"
}

33
lib/mastodon/timestamp_ids.rb → lib/mastodon/snowflake.rb
View File

@ -1,8 +1,32 @@
# frozen_string_literal: true
module Mastodon::TimestampIds
module Mastodon::Snowflake
DEFAULT_REGEX = /timestamp_id\('(?<seq_prefix>\w+)'/
class Callbacks
def self.around_create(record)
now = Time.now.utc
if record.created_at.nil? || record.created_at >= now || record.created_at == record.updated_at
yield
else
record.id = Mastodon::Snowflake.id_at(record.created_at)
tries = 0
begin
yield
rescue ActiveRecord::RecordNotUnique
raise if tries > 100
tries += 1
record.id += rand(100)
retry
end
end
end
end
class << self
# Our ID will be composed of the following:
# 6 bytes (48 bits) of millisecond-level timestamp
@ -114,6 +138,13 @@ module Mastodon::TimestampIds
end
end
def id_at(timestamp)
id = timestamp.to_i * 1000 + rand(1000)
id = id << 16
id += rand(2**16)
id
end
private
def already_defined?

6
lib/tasks/db.rake
View File

@ -1,6 +1,6 @@
# frozen_string_literal: true
require Rails.root.join('lib', 'mastodon', 'timestamp_ids')
require_relative '../mastodon/snowflake'
def each_schema_load_environment
# If we're in development, also run this for the test environment.
@ -63,13 +63,13 @@ namespace :db do
task :define_timestamp_id do
each_schema_load_environment do
Mastodon::TimestampIds.define_timestamp_id
Mastodon::Snowflake.define_timestamp_id
end
end
task :ensure_id_sequences_exist do
each_schema_load_environment do
Mastodon::TimestampIds.ensure_id_sequences_exist
Mastodon::Snowflake.ensure_id_sequences_exist
end
end
end

4
spec/services/activitypub/process_collection_service_spec.rb
View File

@ -28,7 +28,7 @@ RSpec.describe ActivityPub::ProcessCollectionService do
it 'processes payload with sender if no signature exists' do
expect_any_instance_of(ActivityPub::LinkedDataSignature).not_to receive(:verify_account!)
expect(ActivityPub::Activity).to receive(:factory).with(instance_of(Hash), forwarder)
expect(ActivityPub::Activity).to receive(:factory).with(instance_of(Hash), forwarder, instance_of(Hash))
subject.call(json, forwarder)
end
@ -37,7 +37,7 @@ RSpec.describe ActivityPub::ProcessCollectionService do
payload['signature'] = {'type' => 'RsaSignature2017'}
expect_any_instance_of(ActivityPub::LinkedDataSignature).to receive(:verify_account!).and_return(actor)
expect(ActivityPub::Activity).to receive(:factory).with(instance_of(Hash), actor)
expect(ActivityPub::Activity).to receive(:factory).with(instance_of(Hash), actor, instance_of(Hash))
subject.call(json, forwarder)
end