diff --git a/LICENSE.txt b/LICENSE.txt new file mode 100644 --- /dev/null +++ b/LICENSE.txt @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. By contrast, +the GNU General Public License is intended to guarantee your freedom to +share and change all versions of a program--to make sure it remains free +software for all its users. We, the Free Software Foundation, use the +GNU General Public License for most of our software; it applies also to +any other work released this way by its authors. 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If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/Setup.hs b/Setup.hs new file mode 100644 --- /dev/null +++ b/Setup.hs @@ -0,0 +1,2 @@ +import Distribution.Simple +main = defaultMain diff --git a/pinboard-notes-backup.cabal b/pinboard-notes-backup.cabal new file mode 100644 --- /dev/null +++ b/pinboard-notes-backup.cabal @@ -0,0 +1,47 @@ +name: pinboard-notes-backup +version: 1.0.4 +synopsis: Back up the notes you've saved to Pinboard +description: A command-line application to synchronize your notes from + the Pinboard bookmarking service to a local SQLite + database. (This synchronization is one-way only; the + application will never change anything on the server.) +homepage: https://github.com/bdesham/pinboard-notes-backup +license: GPL-3 +license-file: LICENSE.txt +author: Benjamin Esham +maintainer: benjamin@esham.io +copyright: 2016-2017, 2019 Benjamin D. Esham +category: Backup, Web +build-type: Simple +cabal-version: >= 1.10 + +source-repository head + type: git + location: git://github.com/bdesham/pinboard-notes-backup.git + +executable pnbackup + hs-source-dirs: src + main-is: Main.hs + other-modules: Paths_pinboard_notes_backup Pinboard Types Utils Utils.FriendlyReqError + default-language: Haskell2010 + build-depends: base >= 4.7 && < 5 + , aeson >= 0.8 && < 1.5 + , ansi-wl-pprint >= 0.6 && < 0.7 + , bytestring >= 0.10 && < 0.11 + , containers >= 0.5 && < 0.7 + , http-client >= 0.5 && < 0.6 + , http-types >= 0.12 && < 0.13 + , mtl >= 2.2 && < 2.3 + , optparse-applicative >= 0.11 && < 0.15 + , req >= 1.0 && < 1.3 + , sqlite-simple >= 0.4 && < 0.5 + , text >= 1.2 && < 1.3 + , time >= 1.5 && < 1.10 + , transformers >= 0.4 && < 0.6 + default-extensions: DataKinds + DeriveFunctor + GeneralizedNewtypeDeriving + InstanceSigs + OverloadedStrings + ghc-options: -Wall -Wincomplete-uni-patterns -Wincomplete-record-updates + -fno-warn-unused-do-bind diff --git a/src/Main.hs b/src/Main.hs new file mode 100644 --- /dev/null +++ b/src/Main.hs @@ -0,0 +1,101 @@ +module Main where + +import Prelude hiding (id, putStrLn) +import Data.Monoid ((<>)) +import Data.Text (intercalate) +import Data.Text.IO (putStrLn) +import Data.Version (showVersion) +import Database.SQLite.Simple +import Options.Applicative +import Paths_pinboard_notes_backup (version) +import Pinboard +import System.Exit (exitFailure) +import Text.PrettyPrint.ANSI.Leijen (Doc, vsep) +import Types +import Utils (pluralize, putStrLnErr) + + +-- * Command line parsing + +data ProgramOptions = ProgramOptions { o_apiToken :: String + , o_verbosity :: Verbosity + , o_databasePath :: String + } + +optionsParser :: Options.Applicative.Parser ProgramOptions +optionsParser = ProgramOptions + <$> strOption (short 't' + <> long "token" + <> metavar "TOKEN" + <> help tokenHelp) + <*> flag Standard Verbose (short 'v' + <> long "verbose" + <> help verboseHelp) + <*> argument str (metavar "FILE" + <> help pathHelp) + where tokenHelp = "Your API token (e.g. maciej:abc123456). " + <> "You can find this at ." + verboseHelp = "Display detailed progress information." + pathHelp = "Filename of the SQLite database where your notes will be stored. " + <> "This file will be created if it does not already exist. " + <> "Notes are always stored in a table called \"notes\"." + +addVersionOption :: Options.Applicative.Parser (a -> a) +addVersionOption = infoOption ("pnbackup " <> showVersion version) + (long "version" + <> help "Show the version number" + <> hidden) + +footerText :: Doc +footerText = vsep [ "For more information, see \"man pnbackup\"." + , "" + , "Copyright © 2016–2017, 2019 Benjamin D. Esham" + , "" + , "License GPLv3+: GNU GPL version 3 or later ." + , "This is free software: you are free to change and redistribute it." + , "There is NO WARRANTY, to the extent permitted by law." + ] + +commandLineOptions :: ParserInfo ProgramOptions +commandLineOptions = info (addVersionOption <*> helper <*> optionsParser) parserInfo + where parserInfo = fullDesc + <> header "pnbackup -- Back up the notes you've saved to Pinboard" + <> footerDoc (Just footerText) + + +-- * Main + +main :: IO () +main = execParser commandLineOptions >>= main' + +main' :: ProgramOptions -> IO () +main' (ProgramOptions apiToken verbosity databasePath) = do + conn <- open databasePath + execute_ conn createTableQuery + + result <- runPinboard apiToken verbosity $ backUpNotes conn + case result of + Left err -> putStrLnErr ("pnbackup: " <> err) >> exitFailure + Right result' -> displayResult result' + +createTableQuery :: Query +createTableQuery = mconcat [ "CREATE TABLE IF NOT EXISTS notes " + , "(id TEXT NOT NULL UNIQUE, " + , "title TEXT NOT NULL, " + , "text TEXT NOT NULL, " + , "hash TEXT NOT NULL, " + , "created DATETIME NOT NULL, " + , "updated DATETIME NOT NULL)" + ] + +displayResult :: ApplicationResult -> IO () +displayResult (ApplicationResult upToDate updated new deleted) = do + putStrLn $ intercalate ", " [ updatedString + , newString + , deletedString + , upToDateString + ] <> "." + where upToDateString = pluralize "note already up-to-date" "notes already up-to-date" upToDate + updatedString = pluralize "note updated" "notes updated" updated + newString = pluralize "new note" "new notes" new + deletedString = pluralize "note deleted" "notes deleted" deleted diff --git a/src/Pinboard.hs b/src/Pinboard.hs new file mode 100644 --- /dev/null +++ b/src/Pinboard.hs @@ -0,0 +1,192 @@ +module Pinboard ( PinboardM + , runPinboard + , backUpNotes + ) where + +import Prelude hiding (log, putStrLn) +import Control.Concurrent (threadDelay) +import Control.Monad.Except +import Control.Monad.Reader +import Control.Monad.State.Class +import Control.Monad.State.Lazy (StateT, evalStateT) +import Data.Aeson +import Data.Aeson.Types +import Data.ByteString.Char8 as B (pack) +import Data.ByteString.Lazy (ByteString) +import Data.Foldable (for_) +import Data.Monoid ((<>)) +import Data.Set ((\\)) +import qualified Data.Set as Set +import Data.Text (Text) +import Data.Text.IO (putStrLn) +import Data.Time.Clock (NominalDiffTime, UTCTime, diffUTCTime, getCurrentTime) +import Data.Time.Clock.POSIX (posixSecondsToUTCTime) +import Data.Traversable (for) +import Data.Version (showVersion) +import Database.SQLite.Simple +import Network.HTTP.Req +import Paths_pinboard_notes_backup (version) +import Types +import Utils (count, friendlyReqError) + + +-- * Constants + +nominalDiffTimeToMicroseconds :: NominalDiffTime -> Int +nominalDiffTimeToMicroseconds = floor . ((1000000 :: Double) *) . realToFrac + +-- | The time we should wait between requests to the API. This is measured in seconds. +delayTime :: NominalDiffTime +delayTime = 3 + +allNotesUrl :: Url 'Https +allNotesUrl = https "api.pinboard.in" /: "v1" /: "notes" /: "list" + +noteUrl :: NoteId -> Url 'Https +noteUrl noteId = https "api.pinboard.in" /: "v1" /: "notes" /: (noteIdToText noteId) + + +-- * SQLite queries + +selectUpdatedQuery :: Query +selectUpdatedQuery = "SELECT updated FROM notes WHERE id=?" + +deleteQuery :: Query +deleteQuery = "DELETE FROM notes WHERE id=?" + +insertQuery :: Query +insertQuery = "INSERT INTO notes (id, title, text, hash, created, updated) VALUES(?, ?, ?, ?, ?, ?)" + + +-- * Types + +data NoteStatus = New | Updated | UpToDate + deriving (Eq) + +data PinboardConfig = PinboardConfig { c_token :: String + , c_verbosity :: Verbosity + } + +data PinboardState = PinboardState { s_lastSuccess :: UTCTime + } + +newtype PinboardM a = Thing { + runPinboardM :: ReaderT PinboardConfig (StateT PinboardState (ExceptT Text IO)) a +} deriving (Applicative, Functor, Monad, MonadIO, MonadReader PinboardConfig, + MonadState PinboardState, MonadError Text) + +instance MonadHttp PinboardM where + handleHttpException :: HttpException -> PinboardM a + handleHttpException = throwError . friendlyReqError + +runPinboard :: String -> Verbosity -> PinboardM a -> IO (Either Text a) +runPinboard token verbosity k = + let config = PinboardConfig token verbosity + initialState = PinboardState (posixSecondsToUTCTime 0) + in runExceptT (evalStateT (runReaderT (runPinboardM k) config) initialState) + + +-- * Helper functions + +-- | Takes a URL, appends the API token, makes a GET request, and returns the body of the response +-- (if the status code was 2xx) or else Nothing. +performRequest :: Url 'Https -> PinboardM ByteString +performRequest url = do + previousTime <- s_lastSuccess <$> get + currentTime <- liftIO $ getCurrentTime + let timeToWait = delayTime - (diffUTCTime currentTime previousTime) + liftIO $ when (timeToWait > 0) $ + threadDelay (nominalDiffTimeToMicroseconds timeToWait) + + opts <- reqOptions + response <- req GET url NoReqBody lbsResponse opts + + newCurrentTime <- liftIO $ getCurrentTime + put $ PinboardState newCurrentTime + + return $ responseBody response + +reqOptions :: PinboardM (Option scheme) +reqOptions = do + token <- c_token <$> ask + return $ mconcat [ header "User-Agent" $ B.pack userAgent + , "format" =: ("json" :: Text) + , "auth_token" =: token + ] + where userAgent = "pnbackup/" <> showVersion version <> " (+" <> url <> ")" + url = "https://github.com/bdesham/pinboard-notes-backup" + +returnOrThrow :: Maybe a -> Text -> PinboardM a +returnOrThrow Nothing err = throwError err +returnOrThrow (Just value) _ = return value + + +-- * Business logic + +backUpNotes :: Connection -> PinboardM ApplicationResult +backUpNotes conn = do + log "Downloading the list of notes..." + notesList <- getNotesList + + log "Processing notes (this may take a while)..." + localNoteOnlyIds <- liftIO $ query_ conn "SELECT id FROM notes" + let localNoteIds = (Set.fromList . map fromOnly) localNoteOnlyIds + remoteNoteIds = (Set.fromList . map ns_id) notesList + notesToDelete = localNoteIds \\ remoteNoteIds + numberToDelete = length notesToDelete + for_ notesToDelete $ deleteNote conn + statuses <- for notesList $ handleNote conn + + return $ ApplicationResult (count UpToDate statuses) + (count Updated statuses) + (count New statuses) + numberToDelete + +handleNote :: Connection -> NoteSignature -> PinboardM NoteStatus +handleNote conn (NoteSignature noteId lastUpdated) = do + lastUpdatedLocally <- liftIO $ query conn selectUpdatedQuery (Only noteId) + if length (lastUpdatedLocally :: [Only UTCTime]) == 0 + then updateNoteFromServer conn noteId >> return New + else if (fromOnly $ head lastUpdatedLocally) < lastUpdated + then updateNoteFromServer conn noteId >> return Updated + else return UpToDate + +getNote :: NoteId -> PinboardM Note +getNote noteId = do + logVerbose $ "Downloading note " <> (noteIdToText noteId) + body <- performRequest $ noteUrl noteId + let noteObject = decode body :: Maybe Note + returnOrThrow noteObject ("Couldn't retrieve note " <> noteIdToText noteId) + +getNotesList :: PinboardM [NoteSignature] +getNotesList = do + body <- performRequest allNotesUrl + let noteSignatures = do -- This "do" block is within the Maybe monad + bodyObject <- decode body :: Maybe Object + notes <- (parseMaybe (\obj -> obj .: "notes") bodyObject) :: Maybe [NoteSignature] + return notes + returnOrThrow noteSignatures "Error getting the list of notes from the server" + +deleteNote :: Connection -> NoteId -> PinboardM () +deleteNote conn noteId = do + logVerbose $ "Deleting note " <> (noteIdToText noteId) + liftIO $ execute conn deleteQuery (Only noteId) + +updateNoteFromServer :: Connection -> NoteId -> PinboardM () +updateNoteFromServer conn noteId = do + note <- getNote noteId + liftIO $ execute conn deleteQuery (Only noteId) + liftIO $ execute conn insertQuery note + + +-- * Logging + +log :: Text -> PinboardM () +log = liftIO . putStrLn + +-- | Prints the given message, but only if the application was run with --verbose. +logVerbose :: Text -> PinboardM () +logVerbose message = do + verbosity <- c_verbosity <$> ask + when (verbosity == Verbose) $ + liftIO $ putStrLn message diff --git a/src/Types.hs b/src/Types.hs new file mode 100644 --- /dev/null +++ b/src/Types.hs @@ -0,0 +1,75 @@ +module Types ( Note(..) + , NoteId + , NoteSignature(..) + , noteIdToText + , ApplicationResult(..) + , Verbosity(..) + ) where + +import Data.Aeson +import Data.Aeson.Types +import Data.Text (Text) +import Data.Time.Clock (UTCTime) +import Data.Time.Format +import Database.SQLite.Simple +import Database.SQLite.Simple.FromField +import Database.SQLite.Simple.ToField + + +-- * NoteId + +newtype NoteId = NoteId Text + deriving (Eq, Ord, FromField, FromJSON, ToField) + +noteIdToText :: NoteId -> Text +noteIdToText (NoteId t) = t + + +-- * Note + +data Note = Note { note_id :: NoteId + , note_title :: Text + , note_text :: Text + , note_hash :: Text + , note_created :: Text + , note_updated :: Text + } + +instance ToRow Note where + toRow (Note n_id n_title n_text n_hash n_created n_updated) = + toRow (n_id, n_title, n_text, n_hash, n_created, n_updated) + +instance FromJSON Note where + parseJSON (Object o) = Note <$> + o .: "id" <*> + o .: "title" <*> + o .: "text" <*> + o .: "hash" <*> + o .: "created_at" <*> + o .: "updated_at" + parseJSON other = typeMismatch "Note" other + + +-- * NoteSignature + +data NoteSignature = NoteSignature { ns_id :: NoteId + , ns_updated :: UTCTime + } + +instance FromJSON NoteSignature where + parseJSON (Object o) = NoteSignature <$> + o .: "id" <*> + (o .: "updated_at" >>= timeFromString) + where timeFromString = parseTimeM False defaultTimeLocale "%Y-%m-%d %H:%M:%S" + parseJSON other = typeMismatch "NoteSignature" other + +-- * ApplicationResult + +-- | Structure describing how many notes were updated, newly added, deleted, and already up to date, +-- respectively. +data ApplicationResult = ApplicationResult Int Int Int Int + +-- * Verbosity + +data Verbosity = Verbose | Standard + deriving (Eq) diff --git a/src/Utils.hs b/src/Utils.hs new file mode 100644 --- /dev/null +++ b/src/Utils.hs @@ -0,0 +1,24 @@ +module Utils ( count + , friendlyReqError + , pluralize + , putStrLnErr + ) where + +import Data.List (foldl') +import Data.Text (Text, pack) +import Data.Text.IO (hPutStrLn) +import System.IO (hFlush, stderr, stdout) +import Utils.FriendlyReqError (friendlyReqError) + +-- | Counts the number of occurrences of the given value within the given list. +count :: (Eq a, Foldable t) => a -> t a -> Int +count needle = foldl' (\accum item -> if item == needle then succ accum else accum) 0 + +pluralize :: Text -> Text -> Int -> Text +pluralize singular _ 1 = "1 " <> singular +pluralize _ plural n = (pack . show) n <> " " <> plural + +putStrLnErr :: Text -> IO () +putStrLnErr message = do + hFlush stdout + hPutStrLn stderr message diff --git a/src/Utils/FriendlyReqError.hs b/src/Utils/FriendlyReqError.hs new file mode 100644 --- /dev/null +++ b/src/Utils/FriendlyReqError.hs @@ -0,0 +1,34 @@ +module Utils.FriendlyReqError where + +import Data.Text (Text, isInfixOf, pack) +import Network.HTTP.Client +import qualified Network.HTTP.Req as Req +import Network.HTTP.Types.Status + +friendlyReqError :: Req.HttpException -> Text + +friendlyReqError (Req.VanillaHttpException (HttpExceptionRequest _ (StatusCodeException resp _))) + | responseStatus resp == unauthorized401 = "Error: The username or API token was incorrect." + | otherwise = "Error: Received an unexpected HTTP " + <> pack (show (statusCode (responseStatus resp))) <> + " response from the server." + +friendlyReqError (Req.VanillaHttpException (HttpExceptionRequest _ ResponseTimeout)) = + "Error: The server took too long to return a response." + +friendlyReqError (Req.VanillaHttpException (HttpExceptionRequest _ ConnectionTimeout)) = + "Error: Attempting to connect to the server timed out." + +friendlyReqError (Req.VanillaHttpException (HttpExceptionRequest _ (ConnectionFailure exc))) + | "nodename nor servname provided, or not known" `isInfixOf` (pack (show exc)) = + "Error: The Pinboard server's IP address could not be looked up. Are\n\ + \you sure your internet connection is active?" + | otherwise = "Could not connect to the server: " <> pack (show exc) + +friendlyReqError (Req.VanillaHttpException (HttpExceptionRequest _ other)) = + "Error while communicating with the Pinboard server: " <> pack (show other) + +friendlyReqError (Req.VanillaHttpException (InvalidUrlException url reason)) = + "Error: The URL \"" <> pack url <> "\" is invalid: " <> pack reason + +friendlyReqError (Req.JsonHttpException reason) = "Error decoding JSON: " <> pack reason