{-# LANGUAGE ScopedTypeVariables #-} {- Copyright (C) 2008-9 John MacFarlane This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA -} {- Handlers for wiki functions. -} module Network.Gitit.Handlers ( handleAny , debugHandler , randomPage , discussPage , createPage , showActivity , goToPage , searchResults , uploadForm , uploadFile , indexPage , categoryPage , categoryListPage , preview , showRawPage , showFileAsText , showPageHistory , showFileHistory , showPage , showPageDiff , showFileDiff , exportPage , updatePage , editPage , deletePage , confirmDelete , showHighlightedSource , currentUser , expireCache , feedHandler ) where import Data.FileStore import Network.Gitit.Server import Network.Gitit.Framework import Network.Gitit.Layout import Network.Gitit.State import Network.Gitit.Types import Network.Gitit.Feed (filestoreToXmlFeed, FeedConfig(..)) import Network.Gitit.Util (orIfNull) import Network.Gitit.Cache (expireCachedFile, lookupCache, cacheContents) import Network.Gitit.ContentTransformer (showRawPage, showFileAsText, showPage, exportPage, showHighlightedSource, preview, applyPreCommitPlugins) import Network.Gitit.Page (extractCategories) import Control.Exception (throwIO, catch, try) import Prelude hiding (writeFile, readFile, catch) import Data.ByteString.UTF8 (toString) import System.Time import System.FilePath import System.IO.UTF8 (readFile) import Network.Gitit.State import Text.XHtml hiding ( (), dir, method, password, rev ) import qualified Text.XHtml as X ( method ) import Data.List (intersperse, nub, sortBy, find, isPrefixOf, inits, sort) import Data.Maybe (fromMaybe, mapMaybe, isJust, catMaybes) import Data.Ord (comparing) import Data.Char (toLower) import Control.Monad.Reader import qualified Data.ByteString.Lazy as B import qualified Data.ByteString as S import Network.HTTP (urlEncodeVars) import Data.DateTime (getCurrentTime, addMinutes) import Data.FileStore import System.Log.Logger (logM, Priority(..)) handleAny :: Handler handleAny = uriRest $ \uri -> let path' = uriPath uri in do fs <- getFileStore mimetype <- getMimeTypeForExtension (takeExtension path') res <- liftIO $ try (retrieve fs path' Nothing :: IO B.ByteString) case res of Right contents -> ignoreFilters >> -- don't compress (ok $ setContentType mimetype $ (toResponse noHtml) {rsBody = contents}) -- ugly hack Left NotFound -> anyRequest mzero Left e -> error (show e) debugHandler :: Handler debugHandler = withData $ \(params :: Params) -> do req <- askRq liftIO $ logM "gitit" DEBUG (show req) page <- getPage liftIO $ logM "gitit" DEBUG $ "Page = '" ++ page ++ "'\n" ++ show params mzero randomPage :: Handler randomPage = do fs <- getFileStore files <- liftIO $ index fs let pages = map dropExtension $ filter (\f -> isPageFile f && not (isDiscussPageFile f)) files base' <- getWikiBase if null pages then error "No pages found!" else do TOD _ picosecs <- liftIO getClockTime let newPage = pages !! ((fromIntegral picosecs `div` 1000000) `mod` length pages) seeOther (base' ++ urlForPage newPage) $ toResponse $ p << "Redirecting to a random page" discussPage :: Handler discussPage = do page <- getPage base' <- getWikiBase seeOther (base' ++ urlForPage (if isDiscussPage page then page else ('@':page))) $ toResponse "Redirecting to discussion page" createPage :: Handler createPage = do page <- getPage base' <- getWikiBase case page of ('_':_) -> mzero -- don't allow creation of _index, etc. _ -> formattedPage defaultPageLayout{ pgPageName = page , pgTabs = [] , pgTitle = "Create " ++ page ++ "?" } $ p << [ stringToHtml ("There is no page '" ++ page ++ "'. You may create the page by "), anchor ! [href $ base' ++ "/_edit" ++ urlForPage page] << "clicking here." ] uploadForm :: Handler uploadForm = withData $ \(params :: Params) -> do let origPath = pFilename params let wikiname = pWikiname params `orIfNull` takeFileName origPath let logMsg = pLogMsg params let upForm = form ! [X.method "post", enctype "multipart/form-data"] << fieldset << [ p << [label << "File to upload:" , br , afile "file" ! [value origPath] ] , p << [ label << "Name on wiki, including extension" , noscript << " (leave blank to use the same filename)" , stringToHtml ":" , br , textfield "wikiname" ! [value wikiname] , primHtmlChar "nbsp" , checkbox "overwrite" "yes" , label << "Overwrite existing file" ] , p << [ label << "Description of content or changes:" , br , textfield "logMsg" ! [size "60", value logMsg] , submit "upload" "Upload" ] ] formattedPage defaultPageLayout{ pgMessages = pMessages params, pgScripts = ["uploadForm.js"], pgShowPageTools = False, pgTabs = [], pgTitle = "Upload a file"} upForm uploadFile :: Handler uploadFile = withData $ \(params :: Params) -> do let origPath = pFilename params let fileContents = pFileContents params let wikiname = pWikiname params `orIfNull` takeFileName origPath let logMsg = pLogMsg params cfg <- getConfig mbUser <- getLoggedInUser (user, email) <- case mbUser of Nothing -> fail "User must be logged in to delete page." Just u -> return (uUsername u, uEmail u) let overwrite = pOverwrite params fs <- getFileStore exists <- liftIO $ catch (latest fs wikiname >> return True) $ \e -> if e == NotFound then return False else throwIO e >> return True let imageExtensions = [".png", ".jpg", ".gif"] let errors = validate [ (null logMsg, "Description cannot be empty.") , (null origPath, "File not found.") , (not overwrite && exists, "A file named '" ++ wikiname ++ "' already exists in the repository: choose a new name " ++ "or check the box to overwrite the existing file.") , (B.length fileContents > fromIntegral (maxUploadSize cfg), "File exceeds maximum upload size.") , (isPageFile wikiname, "This file extension is reserved for wiki pages.") ] if null errors then do expireCachedFile wikiname `mplus` return () liftIO $ save fs wikiname (Author user email) logMsg fileContents let contents = thediv << [ h2 << ("Uploaded " ++ show (B.length fileContents) ++ " bytes") , if takeExtension wikiname `elem` imageExtensions then p << "To add this image to a page, use:" +++ pre << ("![alt text](/" ++ wikiname ++ ")") else p << "To link to this resource from a page, use:" +++ pre << ("[link label](/" ++ wikiname ++ ")") ] formattedPage defaultPageLayout{ pgMessages = pMessages params, pgShowPageTools = False, pgTabs = [], pgTitle = "Upload successful"} contents else withMessages errors uploadForm goToPage :: Handler goToPage = withData $ \(params :: Params) -> do let gotopage = pGotoPage params fs <- getFileStore allPageNames <- liftM (map dropExtension . filter isPageFile) $ liftIO $ index fs let findPage f = find f allPageNames let exactMatch f = gotopage == f let insensitiveMatch f = (map toLower gotopage) == (map toLower f) let prefixMatch f = (map toLower gotopage) `isPrefixOf` (map toLower f) base' <- getWikiBase case findPage exactMatch of Just m -> seeOther (base' ++ urlForPage m) $ toResponse "Redirecting to exact match" Nothing -> case findPage insensitiveMatch of Just m -> seeOther (base' ++ urlForPage m) $ toResponse "Redirecting to case-insensitive match" Nothing -> case findPage prefixMatch of Just m -> seeOther (base' ++ urlForPage m) $ toResponse $ "Redirecting" ++ " to partial match" Nothing -> withInput "patterns" gotopage searchResults searchResults :: Handler searchResults = withData $ \(params :: Params) -> do let patterns = pPatterns params fs <- getFileStore matchLines <- if null patterns then return [] else liftIO $ search fs SearchQuery{ queryPatterns = patterns , queryWholeWords = True , queryMatchAll = True , queryIgnoreCase = True } let contentMatches = map matchResourceName matchLines allPages <- liftM (filter isPageFile) $ liftIO $ index fs let inPageName pageName' x = x `elem` (words $ map toLower $ dropExtension pageName') let matchesPatterns pageName' = all (inPageName pageName') $ map (map toLower) patterns let pageNameMatches = filter matchesPatterns allPages let allMatchedFiles = nub $ filter isPageFile contentMatches ++ pageNameMatches let matchesInFile f = mapMaybe (\x -> if matchResourceName x == f then Just (matchLine x) else Nothing) matchLines let matches = map (\f -> (f, matchesInFile f)) allMatchedFiles let relevance (f, ms) = length ms + if f `elem` pageNameMatches then 100 else 0 let preamble = if null matches then h3 << if null patterns then ["Please enter a search term."] else ["No matches found for '", unwords patterns, "':"] else h3 << [(show $ length matches), " matches found for '", unwords patterns, "':"] base' <- getWikiBase let toMatchListItem (file, contents) = li << [ anchor ! [href $ base' ++ urlForPage (dropExtension file)] << dropExtension file , stringToHtml (" (" ++ show (length contents) ++ " matching lines)") , stringToHtml " " , anchor ! [href "#", theclass "showmatch", thestyle "display: none;"] << if length contents > 0 then "[show matches]" else "" , pre ! [theclass "matches"] << unlines contents] let htmlMatches = preamble +++ olist << map toMatchListItem (reverse $ sortBy (comparing relevance) matches) formattedPage defaultPageLayout{ pgMessages = pMessages params, pgShowPageTools = False, pgTabs = [], pgScripts = ["search.js"], pgTitle = "Search results"} htmlMatches showPageHistory :: Handler showPageHistory = withData $ \(params :: Params) -> do page <- getPage showHistory (pathForPage page) page params showFileHistory :: Handler showFileHistory = withData $ \(params :: Params) -> do file <- getPage showHistory file file params showHistory :: String -> String -> Params -> Handler showHistory file page params = do currTime <- liftIO getCurrentTime let oneYearAgo = addMinutes (-1 * 60 * 24 * 365) currTime let since = case pSince params of Nothing -> Just oneYearAgo Just t -> Just t fs <- getFileStore hist <- liftIO $ history fs [file] (TimeRange since Nothing) base' <- getWikiBase let versionToHtml rev pos = li ! [theclass "difflink", intAttr "order" pos, strAttr "revision" (revId rev), strAttr "diffurl" (base' ++ "/_diff/" ++ page)] << [ thespan ! [theclass "date"] << (show $ revDateTime rev) , stringToHtml " (" , thespan ! [theclass "author"] << anchor ! [href $ base' ++ "/_activity?" ++ urlEncodeVars [("forUser", authorName $ revAuthor rev)]] << (authorName $ revAuthor rev) , stringToHtml "): " , anchor ! [href (base' ++ urlForPage page ++ "?revision=" ++ revId rev)] << thespan ! [theclass "subject"] << revDescription rev , noscript << ([ stringToHtml " [compare with " , anchor ! [href $ base' ++ "/_diff" ++ urlForPage page ++ "?to=" ++ revId rev] << "previous" ] ++ (if pos /= 1 then [ primHtmlChar "nbsp" , primHtmlChar "bull" , primHtmlChar "nbsp" , anchor ! [href $ base' ++ "/_diff" ++ urlForPage page ++ "?from=" ++ revId rev] << "current" ] else []) ++ [stringToHtml "]"]) ] if null hist then mzero else do let contents = ulist ! [theclass "history"] << zipWith versionToHtml hist [(length hist), (length hist - 1)..1] let tabs = if file == page -- source file, not wiki page then [ViewTab,HistoryTab] else pgTabs defaultPageLayout formattedPage defaultPageLayout{ pgPageName = page, pgMessages = pMessages params, pgScripts = ["dragdiff.js"], pgTabs = tabs, pgSelectedTab = HistoryTab, pgTitle = ("Changes to " ++ page) } contents showActivity :: Handler showActivity = withData $ \(params :: Params) -> do currTime <- liftIO getCurrentTime let oneMonthAgo = addMinutes (-1 * 60 * 24 * 30) currTime let since = case pSince params of Nothing -> Just oneMonthAgo Just t -> Just t let forUser = pForUser params fs <- getFileStore hist <- liftIO $ history fs [] (TimeRange since Nothing) let hist' = case forUser of Nothing -> hist Just u -> filter (\r -> authorName (revAuthor r) == u) hist let fileFromChange (Added f) = f fileFromChange (Modified f) = f fileFromChange (Deleted f) = f let dropDotPage file = if isPageFile file then dropExtension file else file base' <- getWikiBase let fileAnchor revis file = anchor ! [href $ base' ++ "/_diff" ++ urlForPage file ++ "?to=" ++ revis] << file let filesFor changes revis = intersperse (primHtmlChar "nbsp") $ map (fileAnchor revis . dropDotPage . fileFromChange) changes let heading = h1 << ("Recent changes by " ++ fromMaybe "all users" forUser) let revToListItem rev = li << [ thespan ! [theclass "date"] << (show $ revDateTime rev) , stringToHtml " (" , thespan ! [theclass "author"] << anchor ! [href $ base' ++ "/_activity?" ++ urlEncodeVars [("forUser", authorName $ revAuthor rev)]] << (authorName $ revAuthor rev) , stringToHtml "): " , thespan ! [theclass "subject"] << revDescription rev , stringToHtml " (" , thespan ! [theclass "files"] << filesFor (revChanges rev) (revId rev) , stringToHtml ")" ] let contents = ulist ! [theclass "history"] << map revToListItem hist' formattedPage defaultPageLayout{ pgMessages = pMessages params, pgShowPageTools = False, pgTabs = [], pgTitle = "Recent changes" } (heading +++ contents) showPageDiff :: Handler showPageDiff = withData $ \(params :: Params) -> do page <- getPage showDiff (pathForPage page) page params showFileDiff :: Handler showFileDiff = withData $ \(params :: Params) -> do page <- getPage showDiff page page params showDiff :: String -> String -> Params -> Handler showDiff file page params = do let from = pFrom params let to = pTo params -- 'to' or 'from' must be given when (from == Nothing && to == Nothing) mzero fs <- getFileStore -- if 'to' is not specified, defaults to current revision -- if 'from' is not specified, defaults to revision immediately before 'to' from' <- case (from, to) of (Just _, _) -> return from (Nothing, Nothing) -> return from (Nothing, Just t) -> do pageHist <- liftIO $ history fs [file] (TimeRange Nothing Nothing) let (_, upto) = break (\r -> idsMatch fs (revId r) t) pageHist return $ if length upto >= 2 -- immediately preceding revision then Just $ revId $ upto !! 1 else Nothing result' <- liftIO $ try $ getDiff fs file from' to case result' of Left NotFound -> mzero Left e -> liftIO $ throwIO e Right htmlDiff -> formattedPage defaultPageLayout{ pgPageName = page, pgRevision = from', pgMessages = pMessages params, pgTabs = DiffTab : pgTabs defaultPageLayout, pgSelectedTab = DiffTab } htmlDiff getDiff :: FileStore -> FilePath -> Maybe RevisionId -> Maybe RevisionId -> IO Html getDiff fs file from to = do rawDiff <- diff fs file from to let diffLineToHtml (B, xs) = thespan << unlines xs diffLineToHtml (F, xs) = thespan ! [theclass "deleted"] << unlines xs diffLineToHtml (S, xs) = thespan ! [theclass "added"] << unlines xs return $ h2 ! [theclass "revision"] << ("Changes from " ++ fromMaybe "beginning" from ++ " to " ++ fromMaybe "current" to) +++ pre ! [theclass "diff"] << map diffLineToHtml rawDiff editPage :: Handler editPage = withData $ \(params :: Params) -> do let rev = pRevision params -- if this is set, we're doing a revert fs <- getFileStore page <- getPage let getRevisionAndText = catch (do c <- liftIO $ retrieve fs (pathForPage page) rev -- even if pRevision is set, we return revId of latest -- saved version (because we're doing a revert and -- we don't want gitit to merge the changes with the -- latest version) r <- liftIO $ latest fs (pathForPage page) >>= revision fs return (Just $ revId r, c)) (\e -> if e == NotFound then return (Nothing, "") else throwIO e) (mbRev, raw) <- case pEditedText params of Nothing -> liftIO getRevisionAndText Just t -> let r = if null (pSHA1 params) then Nothing else Just (pSHA1 params) in return (r, t) let messages = pMessages params let logMsg = pLogMsg params let sha1Box = case mbRev of Just r -> textfield "sha1" ! [thestyle "display: none", value r] Nothing -> noHtml let readonly = if isJust (pRevision params) -- disable editing of text box if it's a revert then [strAttr "readonly" "yes", strAttr "style" "color: gray"] else [] base' <- getWikiBase cfg <- getConfig let editForm = gui (base' ++ urlForPage page) ! [identifier "editform"] << [ sha1Box , textarea ! (readonly ++ [cols "80", name "editedText", identifier "editedText"]) << raw , br , label << "Description of changes:" , br , textfield "logMsg" ! (readonly ++ [value logMsg]) , submit "update" "Save" , primHtmlChar "nbsp" , submit "cancel" "Discard" , primHtmlChar "nbsp" , input ! [thetype "button", theclass "editButton", identifier "previewButton", strAttr "onClick" "updatePreviewPane();", strAttr "style" "display: none;", value "Preview" ] , thediv ! [ identifier "previewpane" ] << noHtml ] formattedPage defaultPageLayout{ pgPageName = page, pgMessages = messages, pgRevision = rev, pgShowPageTools = False, pgShowSiteNav = False, pgMarkupHelp = Just $ markupHelp cfg, pgSelectedTab = EditTab, pgScripts = ["preview.js"], pgTitle = ("Editing " ++ page) } editForm confirmDelete :: Handler confirmDelete = do page <- getPage fs <- getFileStore -- determine whether there is a corresponding page, and if not whether there -- is a corresponding file pageTest <- liftIO $ try $ latest fs (pathForPage page) fileToDelete <- case pageTest of Right _ -> return $ pathForPage page -- a page Left NotFound -> do fileTest <- liftIO $ try $ latest fs page case fileTest of Right _ -> return page -- a source file Left NotFound -> return "" Left e -> fail (show e) Left e -> fail (show e) let confirmForm = gui "" << [ p << "Are you sure you want to delete this page?" , input ! [thetype "text", name "filetodelete", strAttr "style" "display: none;", value fileToDelete] , submit "confirm" "Yes, delete it!" , stringToHtml " " , submit "cancel" "No, keep it!" , br ] formattedPage defaultPageLayout{ pgTitle = "Delete " ++ page ++ "?" } $ if null fileToDelete then ulist ! [theclass "messages"] << li << "There is no file or page by that name." else confirmForm deletePage :: Handler deletePage = withData $ \(params :: Params) -> do page <- getPage let file = pFileToDelete params mbUser <- getLoggedInUser (user, email) <- case mbUser of Nothing -> fail "User must be logged in to delete." Just u -> return (uUsername u, uEmail u) let author = Author user email let descrip = "Deleted using web interface." base' <- getWikiBase if pConfirm params && (file == page || file == page <.> "page") then do fs <- getFileStore liftIO $ delete fs file author descrip seeOther (base' ++ "/") $ toResponse $ p << "File deleted" else seeOther (base' ++ urlForPage page) $ toResponse $ p << "Not deleted" updatePage :: Handler updatePage = withData $ \(params :: Params) -> do page <- getPage cfg <- getConfig mbUser <- getLoggedInUser (user, email) <- case mbUser of Nothing -> fail "User must be logged in to delete page." Just u -> return (uUsername u, uEmail u) editedText <- case pEditedText params of Nothing -> error "No body text in POST request" Just b -> applyPreCommitPlugins b let logMsg = pLogMsg params `orIfNull` defaultSummary cfg let oldSHA1 = pSHA1 params fs <- getFileStore base' <- getWikiBase if null logMsg then withMessages ["Description cannot be empty."] editPage else do when (length editedText > fromIntegral (maxUploadSize cfg)) $ error "Page exceeds maximum size." -- check SHA1 in case page has been modified, merge modifyRes <- if null oldSHA1 then liftIO $ create fs (pathForPage page) (Author user email) logMsg editedText >> return (Right ()) else do expireCachedFile (pathForPage page) `mplus` return () liftIO $ catch (modify fs (pathForPage page) oldSHA1 (Author user email) logMsg editedText) (\e -> if e == Unchanged then return (Right ()) else throwIO e) case modifyRes of Right () -> seeOther (base' ++ urlForPage page) $ toResponse $ p << "Page updated" Left (MergeInfo mergedWithRev conflicts mergedText) -> do let mergeMsg = "The page has been edited since you checked it out. " ++ "Changes from revision " ++ revId mergedWithRev ++ " have been merged into your edits below. " ++ if conflicts then "Please resolve conflicts and Save." else "Please review and Save." withMessages [mergeMsg] $ withInput "editedText" mergedText $ withInput "sha1" (revId mergedWithRev) editPage indexPage :: Handler indexPage = do path' <- getPath base' <- getWikiBase let prefix' = if null path' then "" else path' ++ "/" fs <- getFileStore listing <- liftIO $ directory fs prefix' let isDiscussionPage (FSFile f) = isDiscussPageFile f isDiscussionPage (FSDirectory _) = False let prunedListing = filter (not . isDiscussionPage) listing let htmlIndex = fileListToHtml base' prefix' prunedListing formattedPage defaultPageLayout{ pgPageName = prefix', pgShowPageTools = False, pgTabs = [], pgScripts = [], pgTitle = "Contents"} htmlIndex fileListToHtml :: String -> String -> [Resource] -> Html fileListToHtml base' prefix files = let fileLink (FSFile f) | isPageFile f = li ! [theclass "page" ] << anchor ! [href $ base' ++ "/" ++ prefix ++ dropExtension f] << dropExtension f fileLink (FSFile f) = li ! [theclass "upload"] << anchor ! [href $ base' ++ "/" ++ prefix ++ f] << f fileLink (FSDirectory f) = li ! [theclass "folder"] << anchor ! [href $ base' ++ "/" ++ prefix ++ f ++ "/"] << f updirs = drop 1 $ inits $ splitPath $ '/' : prefix uplink = foldr (\d accum -> concatHtml [ anchor ! [theclass "updir", href $ if length d == 1 then base' ++ "/_index" else base' ++ joinPath d] << last d, accum]) noHtml updirs in uplink +++ ulist ! [theclass "index"] << map fileLink files -- NOTE: The current implementation of categoryPage does not go via the -- filestore abstraction. That is bad, but can only be fixed if we add -- more sophisticated searching options to filestore. categoryPage :: Handler categoryPage = do category <- getPath cfg <- getConfig let repoPath = repositoryPath cfg let categoryDescription = "Category: " ++ category fs <- getFileStore files <- liftIO $ index fs let pages = filter (\f -> isPageFile f && not (isDiscussPageFile f)) files matches <- liftM catMaybes $ forM pages $ \f -> liftIO (readFile $ repoPath f) >>= \s -> return $ if category `elem` (extractCategories s) then Just $ dropExtension f else Nothing base' <- getWikiBase let toMatchListItem file = li << [ anchor ! [href $ base' ++ urlForPage (dropExtension file)] << dropExtension file ] let htmlMatches = ulist << map toMatchListItem matches formattedPage defaultPageLayout{ pgPageName = categoryDescription, pgShowPageTools = False, pgTabs = [], pgScripts = ["search.js"], pgTitle = categoryDescription } htmlMatches categoryListPage :: Handler categoryListPage = do cfg <- getConfig let repoPath = repositoryPath cfg fs <- getFileStore files <- liftIO $ index fs let pages = filter (\f -> isPageFile f && not (isDiscussPageFile f)) files categories <- liftIO $ liftM (nub . sort . concat) $ forM pages $ liftM extractCategories . (readFile . (repoPath )) base' <- getWikiBase let toCatLink ctg = li << [ anchor ! [href $ base' ++ "/_category/" ++ ctg] << ctg ] let htmlMatches = ulist << map toCatLink categories formattedPage defaultPageLayout{ pgPageName = "Categories", pgShowPageTools = False, pgTabs = [], pgScripts = ["search.js"], pgTitle = "Categories" } htmlMatches -- | Returns username of logged in user or null string if nobody logged in. currentUser :: Handler currentUser = do req <- askRq ok $ toResponse $ maybe "" toString (getHeader "REMOTE_USER" req) expireCache :: Handler expireCache = do page <- getPage -- try it as a page first, then as an uploaded file expireCachedFile (pathForPage page) `mplus` expireCachedFile page ok $ toResponse () feedHandler :: Handler feedHandler = do cfg <- getConfig when (not $ useFeed cfg) mzero base' <- getWikiBase feedBase <- if null (baseUrl cfg) -- if baseUrl blank, try to get it from Host header then do mbHost <- getHost case mbHost of Nothing -> error "Could not determine base URL" Just hn -> return ("http://" ++ hn ++ base') else return (baseUrl cfg ++ base') let fc = FeedConfig{ fcTitle = wikiTitle cfg , fcBaseUrl = feedBase , fcFeedDays = feedDays cfg } path' <- getPath -- e.g. "foo/bar" if they hit /_feed/foo/bar let file = (path' `orIfNull` "_site") <.> "feed" let mbPath = if null path' then Nothing else Just path' fs <- getFileStore -- first, check for a cached version that is recent enough now <- liftIO $ getClockTime let isRecentEnough t = diffClockTimes now t > noTimeDiff{tdMin = fromIntegral $ feedRefreshTime cfg} mbCached <- lookupCache file case mbCached of Just (modtime, contents) | isRecentEnough modtime -> do let emptyResponse = setContentType "application/atom+xml; charset=utf-8" . toResponse $ () ok $ emptyResponse{rsBody = B.fromChunks [contents]} _ -> do resp <- liftM toResponse $ liftIO (filestoreToXmlFeed fc fs mbPath) cacheContents file $ S.concat $ B.toChunks $ rsBody resp ok . setContentType "application/atom+xml; charset=UTF-8" $ resp