discourse/lib/discourse.rb

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require 'cache'
require_dependency 'plugin/instance'
require_dependency 'auth/default_current_user_provider'
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module Discourse
class SidekiqExceptionHandler
extend Sidekiq::ExceptionHandler
end
def self.handle_exception(ex, context=nil, parent_logger = nil)
context ||= {}
parent_logger ||= SidekiqExceptionHandler
cm = RailsMultisite::ConnectionManagement
parent_logger.handle_exception(ex, {
current_db: cm.current_db,
current_hostname: cm.current_hostname
}.merge(context))
end
# Expected less matches than what we got in a find
class TooManyMatches < Exception; end
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# When they try to do something they should be logged in for
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class NotLoggedIn < Exception; end
# When the input is somehow bad
class InvalidParameters < Exception; end
# When they don't have permission to do something
class InvalidAccess < Exception; end
# When something they want is not found
class NotFound < Exception; end
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# When a setting is missing
class SiteSettingMissing < Exception; end
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# When ImageMagick is missing
class ImageMagickMissing < Exception; end
class InvalidPost < Exception; end
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# When read-only mode is enabled
class ReadOnly < Exception; end
# Cross site request forgery
class CSRF < Exception; end
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def self.filters
@filters ||= [:latest, :unread, :new, :starred, :read, :posted]
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end
def self.anonymous_filters
@anonymous_filters ||= [:latest]
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end
def self.logged_in_filters
@logged_in_filters ||= Discourse.filters - Discourse.anonymous_filters
end
def self.top_menu_items
@top_menu_items ||= Discourse.filters + [:category, :categories, :top]
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end
def self.anonymous_top_menu_items
@anonymous_top_menu_items ||= Discourse.anonymous_filters + [:category, :categories, :top]
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end
def self.activate_plugins!
@plugins = Plugin::Instance.find_all("#{Rails.root}/plugins")
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@plugins.each { |plugin| plugin.activate! }
end
def self.plugins
@plugins
end
def self.assets_digest
@assets_digest ||= begin
digest = Digest::MD5.hexdigest(ActionView::Base.assets_manifest.assets.values.sort.join)
channel = "/global/asset-version"
message = MessageBus.last_message(channel)
unless message && message.data == digest
MessageBus.publish channel, digest
end
digest
end
end
def self.authenticators
# TODO: perhaps we don't need auth providers and authenticators maybe one object is enough
# NOTE: this bypasses the site settings and gives a list of everything, we need to register every middleware
# for the cases of multisite
# In future we may change it so we don't include them all for cases where we are not a multisite, but we would
# require a restart after site settings change
Users::OmniauthCallbacksController::BUILTIN_AUTH + auth_providers.map(&:authenticator)
end
def self.auth_providers
providers = []
if plugins
plugins.each do |p|
next unless p.auth_providers
p.auth_providers.each do |prov|
providers << prov
end
end
end
providers
end
def self.cache
@cache ||= Cache.new
end
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# Get the current base URL for the current site
def self.current_hostname
if SiteSetting.force_hostname.present?
SiteSetting.force_hostname
else
RailsMultisite::ConnectionManagement.current_hostname
end
end
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def self.base_uri(default_value = "")
if !ActionController::Base.config.relative_url_root.blank?
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ActionController::Base.config.relative_url_root
else
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default_value
end
end
def self.base_url_no_prefix
default_port = 80
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protocol = "http"
if SiteSetting.use_https?
protocol = "https"
default_port = 443
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end
result = "#{protocol}://#{current_hostname}"
port = SiteSetting.port.present? && SiteSetting.port.to_i > 0 ? SiteSetting.port.to_i : default_port
result << ":#{SiteSetting.port}" if port != default_port
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result
end
def self.base_url
return base_url_no_prefix + base_uri
end
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def self.enable_readonly_mode
$redis.set readonly_mode_key, 1
MessageBus.publish(readonly_channel, true)
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true
end
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def self.disable_readonly_mode
$redis.del readonly_mode_key
MessageBus.publish(readonly_channel, false)
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true
end
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def self.readonly_mode?
!!$redis.get(readonly_mode_key)
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end
def self.request_refresh!
# Causes refresh on next click for all clients
#
# This is better than `MessageBus.publish "/file-change", ["refresh"]` because
# it spreads the refreshes out over a time period
MessageBus.publish '/global/asset-version', 'clobber'
end
def self.git_version
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return $git_version if $git_version
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# load the version stamped by the "build:stamp" task
f = Rails.root.to_s + "/config/version"
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require f if File.exists?("#{f}.rb")
begin
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$git_version ||= `git rev-parse HEAD`.strip
rescue
$git_version = "unknown"
end
end
# Either returns the site_contact_username user or the first admin.
def self.site_contact_user
user = User.where(username_lower: SiteSetting.site_contact_username.downcase).first if SiteSetting.site_contact_username.present?
user ||= User.admins.real.order(:id).first
end
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def self.system_user
User.where(id: -1).first
end
def self.store
if SiteSetting.enable_s3_uploads?
@s3_store_loaded ||= require 'file_store/s3_store'
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FileStore::S3Store.new
else
@local_store_loaded ||= require 'file_store/local_store'
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FileStore::LocalStore.new
end
end
def self.current_user_provider
@current_user_provider || Auth::DefaultCurrentUserProvider
end
def self.current_user_provider=(val)
@current_user_provider = val
end
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def self.asset_host
Rails.configuration.action_controller.asset_host
end
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def self.readonly_mode_key
"readonly_mode"
end
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def self.readonly_channel
"/site/read-only"
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end
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# all forking servers must call this
# after fork, otherwise Discourse will be
# in a bad state
def self.after_fork
current_db = RailsMultisite::ConnectionManagement.current_db
RailsMultisite::ConnectionManagement.establish_connection(db: current_db)
MessageBus.after_fork
SiteSetting.after_fork
$redis.client.reconnect
Rails.cache.reconnect
# /!\ HACK /!\ force sidekiq to create a new connection to redis
Sidekiq.instance_variable_set(:@redis, nil)
end
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end