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module AutorejectHelper
include ModerationHelper
AUTOBLOCK_TRIGGERS = [:context, :context_starts_with, :context_contains]
def should_reject?(uri = nil)
if uri.nil?
if @object
uri = object_uri.start_with?('http') ? object_uri : @object['url']
elsif @json
uri = @json['id']
end
end
return if uri.nil?
domain = uri.scan(/[\w\-]+\.[\w\-]+(?:\.[\w\-]+)*/).first
blocks = DomainBlock.suspend
return [:domain, uri] if blocks.where(domain: domain).or(blocks.where('domain LIKE ?', "%.#{domain}")).exists?
return unless @json || @object
context = @object['@context'] if @object
if @json
oid = @json['id']
if oid
return [:id_starts_with, uri] if ENV.fetch('REJECT_IF_ID_STARTS_WITH', '').split.any? { |r| oid.start_with?(r) }
return [:id_contains, uri] if ENV.fetch('REJECT_IF_ID_CONTAINS', '').split.any? { |r| r.in?(oid) }
end
username = @json['preferredUsername'] || @json['username']
if username && username.is_a?(String)
username = (@json['actor'] && @json['actor'].is_a?(String)) ? @json['actor'] : ''
username = username.scan(/(?<=\/user\/|\/@|\/users\/)([^\s\/]+)/).first
end
unless username.blank?
username.downcase!
return [:username, uri] if ENV.fetch('REJECT_IF_USERNAME_EQUALS', '').split.any? { |r| r == username }
return [:username_starts_with, uri] if ENV.fetch('REJECT_IF_USERNAME_STARTS_WITH', '').split.any? { |r| username.start_with?(r) }
return [:username_contains, uri] if ENV.fetch('REJECT_IF_USERNAME_CONTAINS', '').split.any? { |r| r.in?(username) }
end
context = @json['@context'] unless @object && context
end
return unless context
if context.is_a?(Array)
inline_context = context.find { |item| item.is_a?(Hash) }
if inline_context
keys = inline_context.keys
return [:context, uri] if ENV.fetch('REJECT_IF_CONTEXT_EQUALS', '').split.any? { |r| r.in?(keys) }
return [:context_starts_with, uri] if ENV.fetch('REJECT_IF_CONTEXT_STARTS_WITH', '').split.any? { |r| keys.any? { |k| k.start_with?(r) } }
return [:context_contains, uri] if ENV.fetch('REJECT_IF_CONTEXT_CONTAINS', '').split.any? { |r| keys.any? { |k| r.in?(k) } }
end
end
nil
end
def reject_reason(reason)
case reason
when :domain
"the origin domain is blocked"
when :id_starts_with
"the object's URI starts with a blocked phrase"
when :id_contains
"the object's URI contains a blocked phrase"
when :username
"the author's username is blocked"
when :username_starts_with
"the author's username starts with a blocked phrase"
when :username_contains
"the author's username contains a blocked phrase"
when :context
"the object's JSON-LD context has a key matching a blocked phrase"
when :context_starts_with
"the object's JSON-LD context has a key starting with a blocked phrase"
when :context_contains
"the object's JSON-LD context has a key containing a blocked phrase"
else
"of an undefined reason"
end
end
def should_autoblock?(reason)
@json['type'] == 'Create' && reason.in?(AUTOBLOCK_TRIGGERS)
end
def autoblock!(uri, reason)
return if uri.nil?
domain = uri.scan(/[\w\-]+\.[\w\-]+(?:\.[\w\-]+)*/).first
domain_policy(uri, :suspend, "Sent an ActivityPub payload (#{uri}) where #{reason}.")
end
def autoreject?(uri = nil)
return false if @options && @options[:imported]
reason, uri = should_reject?(uri)
if reason
reason = reject_reason(reason)
if @json
autoblock!(uri, reason) if should_autoblock?(reason)
Rails.logger.info("Rejected an incoming '#{@json['type']}#{@object && " #{@object['type']}".rstrip}' from #{@json['id']} because #{reason}.")
elsif uri
Rails.logger.info("Rejected an outgoing request to #{uri} because #{reason}.")
end
return true
end
false
end
end
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