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-rw-r--r--.gitignore17
-rw-r--r--CONTRIBUTING.md29
-rw-r--r--LICENSE202
-rw-r--r--README.md9
-rw-r--r--Setup.hs17
-rw-r--r--src/Main.hs105
-rw-r--r--src/Pool.hs55
-rw-r--r--xscreensaver-dbus.cabal94
-rw-r--r--xscreensaver-dbus.service38
9 files changed, 566 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fa10948
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,17 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+.ghc.environment.*
+cabal.project.local
+dist*
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..22b241c
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,29 @@
+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement (CLA). You (or your employer) retain the copyright to your
+contribution; this simply gives us permission to use and redistribute your
+contributions as part of the project. Head over to
+<https://cla.developers.google.com/> to see your current agreements on file or
+to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+## Community Guidelines
+
+This project follows
+[Google's Open Source Community Guidelines](https://opensource.google/conduct/).
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,202 @@
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+ Unless required by applicable law or agreed to in writing, software
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c80466c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# xscreensaver-dbus
+
+xscreensaver-dbus implements the freedesktop.org D-Bus API for screensavers,
+translating D-Bus calls into appropriate invocations of xscreensaver-command.
+This allows D-Bus-compliant applications to interface with xscreensaver.
+
+Currently, xscreensaver-dbus only supports the [Idle Inhibition
+Service](https://people.freedesktop.org/~hadess/idle-inhibition-spec/)
+interface, but adding additional interfaces should be straightforward.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
index 0000000..6091805
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,17 @@
+-- Copyright 2020 Google LLC
+--
+-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
+-- use this file except in compliance with the License. You may obtain a copy of
+-- the License at
+--
+-- https://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+import Distribution.Simple
+
+main = defaultMain
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
index 0000000..dddc9ba
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,105 @@
+-- Copyright 2020 Google LLC
+--
+-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
+-- use this file except in compliance with the License. You may obtain a copy of
+-- the License at
+--
+-- https://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+{-# LANGUAGE OverloadedStrings #-}
+module Main (main) where
+
+import Control.Concurrent (ThreadId, forkIO, killThread, threadDelay)
+import Control.Concurrent.MVar ( MVar, modifyMVar, modifyMVar_, newMVar
+ , newEmptyMVar, putMVar, readMVar, takeMVar )
+import Control.Exception (assert)
+import Control.Monad (forever, unless, void)
+import Data.Maybe (fromJust, isJust, isNothing)
+import qualified Data.Set as Set
+import Data.Word (Word32)
+import qualified DBus as D
+import qualified DBus.Client as DC
+import System.IO (hPutStrLn, stderr)
+import System.Posix.Signals ( Handler(Catch), fullSignalSet, installHandler
+ , sigTERM, sigUSR1)
+import qualified System.Process as Process
+
+import Pool (Pool)
+import qualified Pool
+
+busName = "org.freedesktop.ScreenSaver" :: D.BusName
+screensaverObjectPath = "/org/freedesktop/ScreenSaver" :: D.ObjectPath
+screensaverInterfaceName = "org.freedesktop.ScreenSaver" :: D.InterfaceName
+
+wakeupSeconds = 10 :: Int
+
+type State = (Pool Word32, Maybe ThreadId)
+
+main :: IO ()
+main = do
+ -- Start with 0 as a reserved cookie value. The spec [1] doesn't say anything
+ -- about allowable cookie values, but Firefox uses the zero cookie value to
+ -- indicate “no cookie” [2]. Ensure that we never return a zero cookie to a
+ -- legitimate inhibition request.
+ --
+ -- [1] https://people.freedesktop.org/~hadess/idle-inhibition-spec/index.html
+ -- [2] https://dxr.mozilla.org/mozilla-central/rev/a58462ad649eb95372a1665480505bdefc2b7531/widget/gtk/WakeLockListener.cpp#71
+ state <- newMVar (Pool.withReserved (Set.singleton 0), Nothing)
+ -- Set up SIGUSR1 to dump state.
+ void $ installHandler sigUSR1 (Catch (showInfo state)) (Just fullSignalSet)
+ -- Connect to the bus and start listening.
+ client <- DC.connectSession
+ requestNameReply <- DC.requestName client busName [DC.nameDoNotQueue]
+ unless (requestNameReply == DC.NamePrimaryOwner) $
+ error $ "unable to reserve bus name: " ++ show requestNameReply
+ DC.export client screensaverObjectPath
+ DC.defaultInterface
+ { DC.interfaceName = screensaverInterfaceName
+ , DC.interfaceMethods =
+ [ DC.autoMethod "Inhibit" (inhibit state)
+ , DC.autoMethod "UnInhibit" (uninhibit state) ] }
+ -- Wait for exit. Reference:
+ -- https://mail.haskell.org/pipermail/haskell-cafe/2010-May/077841.html
+ shouldExit <- newEmptyMVar
+ void $ installHandler sigTERM (Catch $ putMVar shouldExit ()) Nothing
+ takeMVar shouldExit
+
+inhibit :: MVar State -> String -> String -> IO Word32
+inhibit stateM _appname _reason =
+ modifyMVar stateM $ \(inhibitions, waker) -> do
+ let (cookie, inhibitions') = fromJust $ Pool.take inhibitions
+ waker' <- if Pool.null inhibitions
+ then assert (isNothing waker) $
+ Just <$> forkIO wakerMain
+ else return waker
+ return ((inhibitions', waker'), cookie)
+
+uninhibit :: MVar State -> Word32 -> IO ()
+uninhibit stateM cookie = modifyMVar_ stateM $ \state@(inhibitions, waker) ->
+ case Pool.put cookie inhibitions of
+ Nothing -> return state
+ Just inhibitions' -> do
+ waker' <- if Pool.null inhibitions'
+ then do
+ assert (isJust waker) (killThread $ fromJust waker)
+ return Nothing
+ else return waker
+ return (inhibitions', waker')
+
+wakerMain :: IO ()
+wakerMain = forever $ do
+ Process.callProcess "xscreensaver-command" ["-deactivate"]
+ threadDelay $ wakeupSeconds * microsecondsPerSecond
+
+showInfo :: MVar State -> IO ()
+showInfo stateM = do
+ state <- readMVar stateM
+ hPutStrLn stderr $ show state
+
+microsecondsPerSecond = 1000 * 1000 :: Int
diff --git a/src/Pool.hs b/src/Pool.hs
new file mode 100644
index 0000000..8bb40eb
--- /dev/null
+++ b/src/Pool.hs
@@ -0,0 +1,55 @@
+-- Copyright 2020 Google LLC
+--
+-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
+-- use this file except in compliance with the License. You may obtain a copy of
+-- the License at
+--
+-- https://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+{-# OPTIONS_GHC -Wno-missing-import-lists #-}
+module Pool
+ ( Pool
+ , empty, withReserved
+ , null
+ , take, put
+ ) where
+
+import Prelude hiding (null, take)
+
+import Control.Monad (guard)
+import qualified Data.List as List
+import Data.Set (Set)
+import qualified Data.Set as Set
+
+data Pool a = Pool { reserved :: Set a, taken :: Set a } deriving (Eq, Show)
+
+empty :: Pool a
+empty = withReserved Set.empty
+
+withReserved :: Set a -> Pool a
+withReserved xs = Pool { reserved = xs, taken = Set.empty }
+
+null :: Pool a -> Bool
+null p = Set.null (taken p)
+
+take :: (Bounded a, Enum a, Ord a) => Pool a -> Maybe (a, Pool a)
+take p = do
+ x <- nextAvailable p
+ return (x, p { taken = Set.insert x (taken p) })
+
+nextAvailable :: (Bounded a, Enum a, Ord a) => Pool a -> Maybe a
+nextAvailable p = List.find (`Set.notMember` unavailable p) (enumFrom minBound)
+
+unavailable :: (Ord a) => Pool a -> Set a
+unavailable p = reserved p `Set.union` taken p
+
+put :: Ord a => a -> Pool a -> Maybe (Pool a)
+put x p = do
+ guard $ x `Set.member` taken p
+ return $ p { taken = Set.delete x (taken p) }
diff --git a/xscreensaver-dbus.cabal b/xscreensaver-dbus.cabal
new file mode 100644
index 0000000..b92d06f
--- /dev/null
+++ b/xscreensaver-dbus.cabal
@@ -0,0 +1,94 @@
+-- Copyright 2020 Google LLC
+--
+-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
+-- use this file except in compliance with the License. You may obtain a copy of
+-- the License at
+--
+-- https://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+-- License for the specific language governing permissions and limitations under
+-- the License.
+
+cabal-version: >=2.0
+name: xscreensaver-dbus
+version: 0.1.0
+synopsis: D-Bus adapter for xscreensaver
+description:
+ xscreensaver-dbus implements the freedesktop.org D-Bus API for screensavers,
+ translating D-Bus calls into appropriate invocations of xscreensaver-command.
+ This allows D-Bus-compliant applications to interface with xscreensaver.
+copyright: 2020 Google LLC
+license: Apache-2.0
+license-file: LICENSE
+author: Benjamin Barenblat
+maintainer: bbaren@google.com
+category: System
+build-type: Simple
+extra-source-files: CONTRIBUTING.md
+ , README.md
+ , xscreensaver-dbus.service
+
+executable xscreensaver-dbus
+ hs-source-dirs: src
+ default-language: Haskell2010
+ other-extensions: OverloadedStrings
+ ghc-options: -Werror
+ -w
+ -- Enabled by default
+ -Wdeprecated-flags -Wwarn=deprecated-flags
+ -Wdeprecations -Wwarn=deprecations
+ -Wdodgy-foreign-imports
+ -Wduplicate-exports
+ -Wempty-enumerations
+ -Winline-rule-shadowing
+ -Wmissing-fields
+ -Wmissing-methods
+ -Woverflowed-literals
+ -Woverlapping-patterns
+ -Wredundant-constraints
+ -Wtabs
+ -Wunrecognised-pragmas -Wwarn=unrecognised-pragmas
+ -Wunrecognised-warning-flags -Wwarn=unrecognised-warning-flags
+ -Wunsupported-calling-conventions
+ -Wunsupported-llvm-version
+ -Wwarnings-deprecations -Wwarn=warnings-deprecations
+ -Wwrong-do-bind
+ -Wsimplifiable-class-constraints
+ -- Enabled by -W
+ -Wdodgy-exports
+ -Wdodgy-imports
+ -Wincomplete-patterns
+ -Wunbanged-strict-patterns
+ -Wunused-binds
+ -Wunused-foralls
+ -Wunused-imports
+ -Wunused-matches
+ -- Enabled by -Wall
+ -Wnoncanonical-monad-instances
+ -Wnoncanonical-monadfail-instances
+ -Wnoncanonical-monoid-instances
+ -Wmissing-monadfail-instances
+ -Wsemigroup
+ -Whi-shadowing
+ -Widentities
+ -Wincomplete-uni-patterns
+ -Wincomplete-record-updates
+ -Wmissing-export-lists
+ -Wmissing-import-lists
+ -Wmissing-exported-signatures
+ -Wmissing-pattern-synonym-signatures
+ -Wname-shadowing
+ -threaded
+ -rtsopts=none
+ -with-rtsopts=-I0
+ -with-rtsopts=-V0
+ main-is: Main.hs
+ other-modules: Pool
+ build-depends: base >=4.9 && <4.12
+ , containers ^>=0.5.7.1
+ , dbus ^>=1.0.1
+ , process >=1.4.2 && <1.7
+ , unix ^>=2.7.2
diff --git a/xscreensaver-dbus.service b/xscreensaver-dbus.service
new file mode 100644
index 0000000..b710773
--- /dev/null
+++ b/xscreensaver-dbus.service
@@ -0,0 +1,38 @@
+# Copyright 2020 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+
+[Unit]
+Description=xscreensaver-dbus D-Bus/XScreenSaver adapter
+
+[Service]
+Type=dbus
+BusName=org.freedesktop.ScreenSaver
+ExecStart=%h/.local/bin/xscreensaver-dbus
+NoNewPrivileges=true
+KeyringMode=private
+ProtectSystem=strict
+ProtectHome=true
+InaccessiblePaths=-/afs /boot -/lost+found /media /mnt /opt /proc /root /run /srv /sys /var
+PrivateTmp=true
+ProtectKernelTunables=true
+ProtectControlGroups=true
+RestrictNamespaces=true
+LockPersonality=true
+MemoryDenyWriteExecute=true
+RestrictRealtime=true
+RemoveIPC=true
+SystemCallArchitectures=native
+
+[Install]
+WantedBy=default.target