aboutsummaryrefslogtreecommitdiff
path: root/Command/WebApp.hs
blob: f2935380d1c72c9ba9a4dff24fed602707092529 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
{- git-annex webapp launcher
 -
 - Copyright 2012 Joey Hess <id@joeyh.name>
 -
 - Licensed under the GNU GPL version 3 or higher.
 -}

{-# LANGUAGE CPP #-}

module Command.WebApp where

import Common.Annex
import Command
import Assistant
import Assistant.Common
import Assistant.NamedThread
import Assistant.Threads.WebApp
import Assistant.WebApp
import Assistant.Install
import Annex.Environment
import Utility.WebApp
import Utility.Daemon (checkDaemon)
#ifdef __ANDROID__
import Utility.Env
#endif
import Annex.Init
import qualified Git
import qualified Git.Config
import qualified Git.CurrentRepo
import qualified Annex
import Config.Files
import Upgrade
import Annex.Version

import Control.Concurrent
import Control.Concurrent.STM

cmd :: Command
cmd = noCommit $ dontCheck repoExists $ notBareRepo $
	noRepo (startNoRepo <$$> optParser) $
		command "webapp" SectionCommon "launch webapp"
			paramNothing (seek <$$> optParser)

data WebAppOptions = WebAppOptions
	{ listenAddress :: Maybe String
	}

optParser :: CmdParamsDesc -> Parser WebAppOptions
optParser _ = WebAppOptions
	<$> optional (strOption
		( long "listen" <> metavar paramAddress
		<> help "accept connections to this address"
		))

seek :: WebAppOptions -> CommandSeek
seek = commandAction . start

start :: WebAppOptions -> CommandStart
start = start' True

start' :: Bool -> WebAppOptions -> CommandStart
start' allowauto o = do
	liftIO ensureInstalled
	ifM isInitialized 
		( maybe notinitialized (go <=< needsUpgrade) =<< getVersion
		, if allowauto
			then liftIO $ startNoRepo o
			else notinitialized
		)
	stop
  where
	go cannotrun = do
		browser <- fromRepo webBrowser
		f <- liftIO . absPath =<< fromRepo gitAnnexHtmlShim
		listenAddress' <- if isJust (listenAddress o)
			then pure (listenAddress o)
			else annexListen <$> Annex.getGitConfig
		ifM (checkpid <&&> checkshim f)
			( if isJust (listenAddress o)
				then error "The assistant is already running, so --listen cannot be used."
				else do
					url <- liftIO . readFile
						=<< fromRepo gitAnnexUrlFile
					liftIO $ if isJust listenAddress'
						then putStrLn url
						else liftIO $ openBrowser browser f url Nothing Nothing
			, do
				startDaemon True True Nothing cannotrun listenAddress' $ Just $ 
					\origout origerr url htmlshim ->
						if isJust listenAddress'
							then maybe noop (`hPutStrLn` url) origout
							else openBrowser browser htmlshim url origout origerr
			)
	checkpid = do
		pidfile <- fromRepo gitAnnexPidFile
		liftIO $ isJust <$> checkDaemon pidfile
	checkshim f = liftIO $ doesFileExist f
	notinitialized = do
		g <- Annex.gitRepo
		liftIO $ cannotStartIn (Git.repoLocation g) "repository has not been initialized by git-annex"
		liftIO $ firstRun o

{- When run without a repo, start the first available listed repository in
 - the autostart file. If none, it's our first time being run! -}
startNoRepo :: WebAppOptions -> IO ()
startNoRepo o = go =<< liftIO (filterM doesDirectoryExist =<< readAutoStartFile)
  where
	go [] = firstRun o
	go (d:ds) = do
		v <- tryNonAsync $ do
			setCurrentDirectory d
			Annex.new =<< Git.CurrentRepo.get
		case v of
			Left e -> do
				cannotStartIn d (show e)
				go ds
			Right state -> void $ Annex.eval state $ do
				whenM (fromRepo Git.repoIsLocalBare) $
					error $ d ++ " is a bare git repository, cannot run the webapp in it"
				callCommandAction $
					start' False o

cannotStartIn :: FilePath -> String -> IO ()
cannotStartIn d reason = warningIO $ "unable to start webapp in repository " ++ d ++ ": " ++ reason

{- Run the webapp without a repository, which prompts the user, makes one,
 - changes to it, starts the regular assistant, and redirects the
 - browser to its url.
 -
 - This is a very tricky dance -- The first webapp calls the signaler,
 - which signals the main thread when it's ok to continue by writing to a
 - MVar. The main thread starts the second webapp, and uses its callback
 - to write its url back to the MVar, from where the signaler retrieves it,
 - returning it to the first webapp, which does the redirect.
 -
 - Note that it's important that mainthread never terminates! Much
 - of this complication is due to needing to keep the mainthread running.
 -}
firstRun :: WebAppOptions -> IO ()
firstRun o = do
	checkEnvironmentIO
	{- Without a repository, we cannot have an Annex monad, so cannot
	 - get a ThreadState. This is only safe because the
	 - webapp checks its noAnnex field before accessing the
	 - threadstate. -}
	let st = error "annex state not available"
	{- Get a DaemonStatus without running in the Annex monad. -}
	dstatus <- atomically . newTMVar =<< newDaemonStatus
	d <- newAssistantData st dstatus
	urlrenderer <- newUrlRenderer
	v <- newEmptyMVar
	let callback a = Just $ a v
	runAssistant d $ do
		startNamedThread urlrenderer $
			webAppThread d urlrenderer True Nothing
				(callback signaler)
				(listenAddress o)
				(callback mainthread)
		waitNamedThreads
  where
	signaler v = do
		putMVar v ""
		takeMVar v
	mainthread v url htmlshim
		| isJust (listenAddress o)= do
			putStrLn url
			hFlush stdout
			go
		| otherwise = do
			browser <- maybe Nothing webBrowser
				<$> catchDefaultIO Nothing Git.Config.global
			openBrowser browser htmlshim url Nothing Nothing
			go
	  where
		go = do
			_wait <- takeMVar v
			state <- Annex.new =<< Git.CurrentRepo.get
			Annex.eval state $
				startDaemon True True Nothing Nothing (listenAddress o) $ Just $
					sendurlback v
	sendurlback v _origout _origerr url _htmlshim = do
		recordUrl url
		putMVar v url

recordUrl :: String -> IO ()
#ifdef __ANDROID__
{- The Android app has a menu item that opens the url recorded
 - in this file. -}
recordUrl url = writeFile "/sdcard/git-annex.home/.git-annex-url" url
#else
recordUrl _ = noop
#endif

openBrowser :: Maybe FilePath -> FilePath -> String -> Maybe Handle -> Maybe Handle -> IO ()
openBrowser mcmd htmlshim realurl outh errh = do
	htmlshim' <- absPath htmlshim
	openBrowser' mcmd htmlshim' realurl outh errh

openBrowser' :: Maybe FilePath -> FilePath -> String -> Maybe Handle -> Maybe Handle -> IO ()
#ifndef __ANDROID__
openBrowser' mcmd htmlshim _realurl outh errh = runbrowser
#else
openBrowser' mcmd htmlshim realurl outh errh = do
	recordUrl url
	{- Android's `am` command does not work reliably across the
	 - wide range of Android devices. Intead, FIFO should be set to 
	 - the filename of a fifo that we can write the URL to. -}
	v <- getEnv "FIFO"
	case v of
		Nothing -> runbrowser
		Just f -> void $ forkIO $ do
			fd <- openFd f WriteOnly Nothing defaultFileFlags
			void $ fdWrite fd url
			closeFd fd
#endif
  where
	p = case mcmd of
		Just c -> proc c [htmlshim]
		Nothing -> 
#ifndef mingw32_HOST_OS
			browserProc url
#else
			{- Windows hack to avoid using the full path,
			 - which might contain spaces that cause problems
			 - for browserProc. -}
			(browserProc (takeFileName htmlshim))
				{ cwd = Just (takeDirectory htmlshim) } 
#endif
#ifdef __ANDROID__
	{- Android does not support file:// urls, but neither is
	 - the security of the url in the process table important
	 - there, so just use the real url. -}
	url = realurl
#else
	url = fileUrl htmlshim
#endif
	runbrowser = do
		hPutStrLn (fromMaybe stdout outh) $ "Launching web browser on " ++ url
		hFlush stdout
		environ <- cleanEnvironment
		(_, _, _, pid) <- createProcess p
			{ env = environ
			, std_out = maybe Inherit UseHandle outh
			, std_err = maybe Inherit UseHandle errh
			}
		exitcode <- waitForProcess pid
		unless (exitcode == ExitSuccess) $
			hPutStrLn (fromMaybe stderr errh) "failed to start web browser"

{- web.browser is a generic git config setting for a web browser program -}
webBrowser :: Git.Repo -> Maybe FilePath
webBrowser = Git.Config.getMaybe "web.browser"

fileUrl :: FilePath -> String
fileUrl file = "file://" ++ file