pandoc-server (empty) → 0.1
raw patch · 3 files changed
+860/−0 lines, 3 filesdep +aesondep +basedep +base64
Dependencies added: aeson, base, base64, bytestring, containers, data-default, doctemplates, pandoc, pandoc-types, servant-server, skylighting, text, unicode-collation, wai, wai-cors
Files
- COPYING.md +361/−0
- pandoc-server.cabal +70/−0
- src/Text/Pandoc/Server.hs +429/−0
+ COPYING.md view
@@ -0,0 +1,361 @@+### GNU GENERAL PUBLIC LICENSE++Version 2, June 1991++ Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA++ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++### Preamble++The licenses for most software are designed to take away your freedom+to share and change it. By contrast, the GNU General Public License is+intended to guarantee your freedom to share and change free+software--to make sure the software is free for all its users. This+General Public License applies to most of the Free Software+Foundation's software and to any other program whose authors commit to+using it. (Some other Free Software Foundation software is covered by+the GNU Lesser General Public License instead.) You can apply it to+your programs, too.++When we speak of free software, we are referring to freedom, not+price. 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+ pandoc-server.cabal view
@@ -0,0 +1,70 @@+cabal-version: 2.4+name: pandoc-server+version: 0.1+build-type: Simple+license: GPL-2.0-or-later+license-file: COPYING.md+copyright: (c) 2006-2022 John MacFarlane+author: John MacFarlane <jgm@berkeley.edu>+maintainer: John MacFarlane <jgm@berkeley.edu>+bug-reports: https://github.com/jgm/pandoc/issues+stability: alpha+homepage: https://pandoc.org+category: Text+tested-with: GHC == 8.6.5, GHC == 8.8.4, GHC == 8.10.7, GHC == 9.0.2,+ GHC == 9.2.5, GHC == 9.4.4+synopsis: Pandoc document conversion as an HTTP servant-server+description: Pandoc-server provides pandoc's document conversion functions+ in an HTTP server.+source-repository head+ type: git+ location: git://github.com/jgm/pandoc.git++common common-options+ default-language: Haskell2010+ build-depends: base >= 4.12 && < 5+ ghc-options: -Wall -fno-warn-unused-do-bind+ -Wincomplete-record-updates+ -Wnoncanonical-monad-instances+ -Wcpp-undef+ -Wincomplete-uni-patterns+ -Widentities+ -Wpartial-fields+ -Wmissing-signatures+ -fhide-source-paths+ -- -Wmissing-export-lists++ if impl(ghc >= 8.10)+ ghc-options: -Wunused-packages++ if impl(ghc >= 9.0)+ ghc-options: -Winvalid-haddock++ if os(windows)+ cpp-options: -D_WINDOWS++common common-executable+ import: common-options+ ghc-options: -rtsopts -with-rtsopts=-A8m -threaded++library+ import: common-options+ build-depends: pandoc >= 3.0,+ pandoc-types >= 1.22 && < 1.24,+ containers >= 0.6.0.1 && < 0.7,+ aeson >= 2.0 && < 2.2,+ bytestring >= 0.9 && < 0.12,+ base64 >= 0.4 && < 0.5,+ doctemplates >= 0.11 && < 0.12,+ data-default >= 0.4 && < 0.8,+ text >= 1.1.1.0 && < 2.1,+ unicode-collation >= 0.1.1 && < 0.2,+ servant-server >= 0.19 && < 0.20,+ skylighting >= 0.13 && < 0.14,+ wai >= 3.2 && < 3.3,+ wai-cors >= 0.2.7 && < 0.3++ hs-source-dirs: src++ exposed-modules: Text.Pandoc.Server+ buildable: True
+ src/Text/Pandoc/Server.hs view
@@ -0,0 +1,429 @@+{-# LANGUAGE DataKinds #-}+{-# LANGUAGE DeriveGeneric #-}+{-# LANGUAGE TypeOperators #-}+{-# LANGUAGE FlexibleContexts #-}+{-# LANGUAGE OverloadedStrings #-}+module Text.Pandoc.Server+ ( app+ , API+ , ServerOpts(..)+ , Params(..)+ , Blob(..)+ , parseServerOptsFromArgs+ ) where++import Data.Aeson+import qualified Data.Aeson.KeyMap as KeyMap+import Network.Wai+import Servant+import Text.DocTemplates as DocTemplates+import Text.Pandoc+import Text.Pandoc.Writers.Shared (lookupMetaString)+import Text.Pandoc.Citeproc (processCitations)+import Text.Pandoc.Highlighting (lookupHighlightingStyle)+import qualified Text.Pandoc.UTF8 as UTF8+import Data.Text (Text)+import qualified Data.Text as T+import qualified Data.Text.Lazy as TL+import qualified Data.Text.Lazy.Encoding as TLE+import Data.Maybe (fromMaybe)+import qualified Data.ByteString as BS+import qualified Data.ByteString.Lazy as BL+import Data.ByteString.Base64 (decodeBase64, encodeBase64)+import Data.Default+import Control.Monad (when, unless, foldM)+import qualified Data.Set as Set+import Skylighting (defaultSyntaxMap)+import qualified Data.Map as M+import Text.Collate.Lang (Lang (..), parseLang)+import System.Console.GetOpt+import System.Environment (getProgName)+import qualified Control.Exception as E+import Text.Pandoc.Shared (safeStrRead, headerShift, filterIpynbOutput,+ eastAsianLineBreakFilter)+import Text.Pandoc.App ( IpynbOutput (..), Opt(..), defaultOpts )+import Text.Pandoc.Builder (setMeta)+import Text.Pandoc.Format (parseFlavoredFormat, formatName)+import Text.Pandoc.SelfContained (makeSelfContained)+import System.Exit+import GHC.Generics (Generic)+import Network.Wai.Middleware.Cors ( cors,+ simpleCorsResourcePolicy, CorsResourcePolicy(corsRequestHeaders) )++data ServerOpts =+ ServerOpts+ { serverPort :: Int+ , serverTimeout :: Int }+ deriving (Show)++defaultServerOpts :: ServerOpts+defaultServerOpts = ServerOpts { serverPort = 3030, serverTimeout = 2 }++cliOptions :: [OptDescr (ServerOpts -> IO ServerOpts)]+cliOptions =+ [ Option ['p'] ["port"]+ (ReqArg (\s opts -> case safeStrRead s of+ Just i -> return opts{ serverPort = i }+ Nothing ->+ E.throwIO $ PandocOptionError $ T.pack+ s <> " is not a number") "NUMBER")+ "port number"+ , Option ['t'] ["timeout"]+ (ReqArg (\s opts -> case safeStrRead s of+ Just i -> return opts{ serverTimeout = i }+ Nothing ->+ E.throwIO $ PandocOptionError $ T.pack+ s <> " is not a number") "NUMBER")+ "timeout (seconds)"++ , Option ['h'] ["help"]+ (NoArg (\_ -> do+ prg <- getProgName+ let header = "Usage: " <> prg <> " [OPTION...]"+ putStrLn $ usageInfo header cliOptions+ exitSuccess))+ "help message"++ , Option ['v'] ["version"]+ (NoArg (\_ -> do+ prg <- getProgName+ putStrLn $ prg <> " " <> T.unpack pandocVersionText+ exitSuccess))+ "version info"++ ]++parseServerOptsFromArgs :: [String] -> IO ServerOpts+parseServerOptsFromArgs args = do+ let handleUnknownOpt x = "Unknown option: " <> x+ case getOpt' Permute cliOptions args of+ (os, ns, unrecognizedOpts, es) -> do+ when (not (null es) || not (null unrecognizedOpts)) $+ E.throwIO $ PandocOptionError $ T.pack $+ concat es ++ unlines (map handleUnknownOpt unrecognizedOpts) +++ ("Try --help for more information.")+ unless (null ns) $+ E.throwIO $ PandocOptionError $ T.pack $+ "Unknown arguments: " <> unwords ns+ foldM (flip ($)) defaultServerOpts os++newtype Blob = Blob BL.ByteString+ deriving (Show, Eq)++instance ToJSON Blob where+ toJSON (Blob bs) = toJSON (encodeBase64 $ BL.toStrict bs)++instance FromJSON Blob where+ parseJSON = withText "Blob" $ \t -> do+ let inp = UTF8.fromText t+ case decodeBase64 inp of+ Right bs -> return $ Blob $ BL.fromStrict bs+ Left _ -> -- treat as regular text+ return $ Blob $ BL.fromStrict inp++-- This is the data to be supplied by the JSON payload+-- of requests. Maybe values may be omitted and will be+-- given default values.+data Params = Params+ { options :: Opt+ , text :: Text+ , files :: Maybe (M.Map FilePath Blob)+ , citeproc :: Maybe Bool+ } deriving (Show)++instance Default Params where+ def = Params+ { options = defaultOpts+ , text = mempty+ , files = Nothing+ , citeproc = Nothing+ }++-- Automatically derive code to convert to/from JSON.+instance FromJSON Params where+ parseJSON = withObject "Params" $ \o ->+ Params+ <$> parseJSON (Object o)+ <*> o .: "text"+ <*> o .:? "files"+ <*> o .:? "citeproc"++instance ToJSON Params where+ toJSON params =+ case toJSON (options params) of+ (Object o) -> Object $+ KeyMap.insert "text" (toJSON $ text params)+ . KeyMap.insert "files" (toJSON $ files params)+ . KeyMap.insert "citeproc" (toJSON $ citeproc params)+ $ o+ x -> x++data Message =+ Message+ { verbosity :: Verbosity+ , message :: Text }+ deriving (Generic, Show)++instance ToJSON Message where+ toEncoding = genericToEncoding defaultOptions++type Base64 = Bool++data Output = Succeeded Text Base64 [Message]+ | Failed Text+ deriving (Generic, Show)++instance ToJSON Output where+ toEncoding (Succeeded o b m) = pairs+ ( "output" .= o <>+ "base64" .= b <>+ "messages" .= m )+ toEncoding (Failed errmsg) = pairs+ ( "error" .= errmsg )++-- This is the API. The "/convert" endpoint takes a request body+-- consisting of a JSON-encoded Params structure and responds to+-- Get requests with either plain text or JSON, depending on the+-- Accept header.+type API =+ ReqBody '[JSON] Params :> Post '[OctetStream] BS.ByteString+ :<|>+ ReqBody '[JSON] Params :> Post '[PlainText] Text+ :<|>+ ReqBody '[JSON] Params :> Post '[JSON] Output+ :<|>+ "batch" :> ReqBody '[JSON] [Params] :> Post '[JSON] [Output]+ :<|>+ "babelmark" :> QueryParam' '[Required] "text" Text :> QueryParam "from" Text :> QueryParam "to" Text :> QueryFlag "standalone" :> Get '[JSON] Value+ :<|>+ "version" :> Get '[PlainText, JSON] Text++app :: Application+app = corsWithContentType $ serve api server++-- | Allow Content-Type header with values other then allowed by simpleCors.+corsWithContentType :: Middleware+corsWithContentType = cors (const $ Just policy)+ where+ policy = simpleCorsResourcePolicy+ { corsRequestHeaders = ["Content-Type"] }++api :: Proxy API+api = Proxy++server :: Server API+server = convertBytes+ :<|> convertText+ :<|> convertJSON+ :<|> mapM convertJSON+ :<|> babelmark -- for babelmark which expects {"html": "", "version": ""}+ :<|> pure pandocVersionText+ where+ babelmark text' from' to' standalone' = do+ res <- convertText def{+ text = text',+ options = defaultOpts{+ optFrom = from',+ optTo = to',+ optStandalone = standalone' }+ }+ return $ toJSON $ object [ "html" .= res, "version" .= pandocVersion ]++ -- We use runPure for the pandoc conversions, which ensures that+ -- they will do no IO. This makes the server safe to use. However,+ -- it will mean that features requiring IO, like RST includes, will not work.+ -- Changing this to+ -- handleErr =<< liftIO (runIO (convert' params))+ -- will allow the IO operations.+ convertText params = handleErr $+ runPure (convert' return (return . encodeBase64 . BL.toStrict) params)++ convertBytes params = handleErr $+ runPure (convert' (return . UTF8.fromText) (return . BL.toStrict) params)++ convertJSON params = handleErrJSON $+ runPure+ (convert'+ (\t -> Succeeded t False . map toMessage <$> getLog)+ (\bs -> Succeeded (encodeBase64 (BL.toStrict bs)) True+ . map toMessage <$> getLog)+ params)++ toMessage m = Message { verbosity = messageVerbosity m+ , message = showLogMessage m }++ convert' :: (Text -> PandocPure a)+ -> (BL.ByteString -> PandocPure a)+ -> Params -> PandocPure a+ convert' textHandler bsHandler params = do+ curtime <- getCurrentTime+ -- put files params in ersatz file system+ let addFile :: FilePath -> Blob -> FileTree -> FileTree+ addFile fp (Blob lbs) =+ insertInFileTree fp FileInfo{ infoFileMTime = curtime+ , infoFileContents = BL.toStrict lbs }+ case files params of+ Nothing -> return ()+ Just fs -> do+ let filetree = M.foldrWithKey addFile mempty fs+ modifyPureState $ \st -> st{ stFiles = filetree }++ let opts = options params+ readerFormat <- parseFlavoredFormat <$> fromMaybe "markdown" $ optFrom opts+ writerFormat <- parseFlavoredFormat <$> fromMaybe "html" $ optTo opts+ (readerSpec, readerExts) <- getReader readerFormat+ (writerSpec, writerExts) <- getWriter writerFormat++ let isStandalone = optStandalone opts+ let toformat = formatName writerFormat+ hlStyle <- traverse (lookupHighlightingStyle . T.unpack)+ $ optHighlightStyle opts++ mbTemplate <- if isStandalone+ then case optTemplate opts of+ Nothing -> Just <$>+ compileDefaultTemplate toformat+ Just t -> Just <$>+ compileCustomTemplate toformat t+ else return Nothing++ abbrevs <- Set.fromList . filter (not . T.null) . T.lines . UTF8.toText <$>+ case optAbbreviations opts of+ Nothing -> readDataFile "abbreviations"+ Just f -> readFileStrict f++ let readeropts = def{ readerExtensions = readerExts+ , readerStandalone = isStandalone+ , readerTabStop = optTabStop opts+ , readerIndentedCodeClasses =+ optIndentedCodeClasses opts+ , readerAbbreviations = abbrevs+ , readerDefaultImageExtension =+ optDefaultImageExtension opts+ , readerTrackChanges = optTrackChanges opts+ , readerStripComments = optStripComments opts+ }++ let writeropts =+ def{ writerExtensions = writerExts+ , writerTabStop = optTabStop opts+ , writerWrapText = optWrap opts+ , writerColumns = optColumns opts+ , writerTemplate = mbTemplate+ , writerSyntaxMap = defaultSyntaxMap+ , writerVariables = optVariables opts+ , writerTableOfContents = optTableOfContents opts+ , writerIncremental = optIncremental opts+ , writerHTMLMathMethod = optHTMLMathMethod opts+ , writerNumberSections = optNumberSections opts+ , writerNumberOffset = optNumberOffset opts+ , writerSectionDivs = optSectionDivs opts+ , writerReferenceLinks = optReferenceLinks opts+ , writerDpi = optDpi opts+ , writerEmailObfuscation = optEmailObfuscation opts+ , writerIdentifierPrefix = optIdentifierPrefix opts+ , writerCiteMethod = optCiteMethod opts+ , writerHtmlQTags = optHtmlQTags opts+ , writerSlideLevel = optSlideLevel opts+ , writerTopLevelDivision = optTopLevelDivision opts+ , writerListings = optListings opts+ , writerHighlightStyle = hlStyle+ , writerSetextHeaders = optSetextHeaders opts+ , writerEpubSubdirectory = T.pack $ optEpubSubdirectory opts+ , writerEpubMetadata = T.pack <$> optEpubMetadata opts+ , writerEpubFonts = optEpubFonts opts+ , writerSplitLevel = optSplitLevel opts+ , writerTOCDepth = optTOCDepth opts+ , writerReferenceDoc = optReferenceDoc opts+ , writerReferenceLocation = optReferenceLocation opts+ , writerPreferAscii = optAscii opts+ }++ let reader = case readerSpec of+ TextReader r -> r readeropts+ ByteStringReader r -> \t -> do+ let eitherbs = decodeBase64 $ UTF8.fromText t+ case eitherbs of+ Left errt -> throwError $ PandocSomeError errt+ Right bs -> r readeropts $ BL.fromStrict bs++ let writer d@(Pandoc meta _) = do+ case lookupMetaString "lang" meta of+ "" -> setTranslations $+ Lang "en" Nothing (Just "US") [] [] []+ l -> case parseLang l of+ Left _ -> report $ InvalidLang l+ Right l' -> setTranslations l'+ case writerSpec of+ TextWriter w ->+ w writeropts d >>=+ (if optEmbedResources opts && htmlFormat (optTo opts)+ then makeSelfContained+ else return) >>=+ textHandler+ ByteStringWriter w ->+ w writeropts d >>= bsHandler++ let transforms :: Pandoc -> Pandoc+ transforms = (case optShiftHeadingLevelBy opts of+ 0 -> id+ x -> headerShift x) .+ (if extensionEnabled Ext_east_asian_line_breaks+ readerExts &&+ not (extensionEnabled Ext_east_asian_line_breaks+ writerExts &&+ optWrap opts == WrapPreserve)+ then eastAsianLineBreakFilter+ else id) .+ (case optIpynbOutput opts of+ IpynbOutputAll -> id+ IpynbOutputNone -> filterIpynbOutput Nothing+ IpynbOutputBest -> filterIpynbOutput (Just $+ case optTo opts of+ Just "latex" -> Format "latex"+ Just "beamer" -> Format "latex"+ Nothing -> Format "html"+ Just f+ | htmlFormat (optTo opts) -> Format "html"+ | otherwise -> Format f))++ let meta = (case optBibliography opts of+ [] -> id+ fs -> setMeta "bibliography" (MetaList+ (map (MetaString . T.pack) fs))) .+ maybe id (setMeta "csl" . MetaString . T.pack)+ (optCSL opts) .+ maybe id (setMeta "citation-abbreviations" . MetaString .+ T.pack)+ (optCitationAbbreviations opts) $+ optMetadata opts++ let addMetadata m' (Pandoc m bs) = Pandoc (m <> m') bs++ reader (text params) >>=+ return . transforms . addMetadata meta >>=+ (case citeproc params of+ Just True -> processCitations+ _ -> return) >>=+ writer++ htmlFormat :: Maybe Text -> Bool+ htmlFormat Nothing = True+ htmlFormat (Just f) =+ any (`T.isPrefixOf` f)+ ["html","html4","html5","s5","slidy", "slideous","dzslides","revealjs"]++ handleErr (Right t) = return t+ handleErr (Left err) = throwError $+ err500 { errBody = TLE.encodeUtf8 $ TL.fromStrict $ renderError err }++ handleErrJSON (Right o) = return o+ handleErrJSON (Left err) =+ return $ Failed (renderError err)++ compileCustomTemplate toformat t = do+ res <- runWithPartials $ compileTemplate ("custom." <> T.unpack toformat)+ (T.pack t)+ case res of+ Left e -> throwError $ PandocTemplateError (T.pack e)+ Right tpl -> return tpl