Initial commit: paste-getting only, no upload.

.gitignore

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+.stack-work
+pastecan.db*

LICENSE

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+Copyright Oliver Marks (c) 2017
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Oliver Marks here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Pastecan.cabal

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+name:                Pastecan
+version:             0.1.0.0
+-- synopsis:
+-- description:
+homepage:            https://github.com/githubuser/servant#readme
+license:             MIT
+author:              Oliver Marks
+maintainer:          osmarks@protonmail.com
+copyright:           2017 Oliver Marks
+category:            Web
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
+
+executable pastecan
+  hs-source-dirs:      src
+  main-is:             Main.hs
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  build-depends:       base >= 4.7 && < 5
+                     , servant
+                     , servant-server
+                     , persistent
+                     , persistent-template
+                     , persistent-sqlite
+                     , wai
+                     , warp
+                     , mtl
+                     , aeson
+                     , containers
+                     , string-conversions
+                     , monad-logger
+  default-language:    Haskell2010
+  other-modules:       Model
+                     , API
+                     , Config
+                     , PasteType

README.md

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+# servant

Setup.hs

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+import Distribution.Simple
+main = defaultMain

src/API.hs

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+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE TypeOperators #-}
+
+module API where
+
+import Servant
+import Control.Monad.Except
+import Database.Persist.Sqlite
+import Data.String.Conversions
+import Control.Monad.Logger
+
+import Network.Wai.Handler.Warp as Warp
+
+import Model
+import Config
+
+type GetPasteAPI = 
+          Capture "username" String :> Capture "pasteName" String :> Get '[JSON] Paste
+    :<|> "raw" :> Capture "username" String :> Capture "pasteName" String :> Get '[PlainText] String
+
+type API = GetPasteAPI
+
+pasteServer :: ServerT GetPasteAPI App
+pasteServer = getPasteData :<|> getPasteRaw
+
+justOrError :: ServantErr -> App (Maybe a) -> App a
+justOrError e m =
+    m >>= 
+        (\w -> case w of
+            Just x -> return x
+            Nothing -> throwError e)
+
+justOr404 :: App (Maybe a) -> App a
+justOr404 = justOrError err404
+
+getPasteData :: String -> String -> App Paste
+getPasteData username name = do
+    userEntity <- justOr404 $ runDB $ getBy $ Username username
+    let (Entity uid _) = userEntity
+    pasteEntity <- justOr404 $ runDB $ selectFirst [PasteParent ==. uid, PasteName ==. name] []
+    let (Entity _ paste) = pasteEntity
+    return paste
+
+getPasteRaw :: String -> String -> App String
+getPasteRaw u n = pasteContent <$> getPasteData u n
+
+server :: HandlerConfig -> Server API
+server cfg = enter (appToServer cfg) pasteServer
+
+proxy :: Proxy API
+proxy = Proxy
+
+mkApp :: FilePath -> IO Application
+mkApp path = do
+    pool <- runStderrLoggingT $ createSqlitePool (cs path) 5
+    runSqlPool doMigrations pool
+    let cfg = HandlerConfig pool
+    return $ serve proxy (server cfg)
+
+runApp :: Int -> FilePath -> IO ()
+runApp port dbFile =
+    Warp.run port =<< mkApp dbFile

src/Config.hs

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+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE TypeOperators #-}
+
+module Config where
+
+import Control.Monad.Reader
+import Control.Monad.Except
+
+import Database.Persist
+import Database.Persist.Sql
+import Servant
+
+data HandlerConfig = HandlerConfig
+    { db :: ConnectionPool
+    }
+
+newtype App a = App
+    { runApp :: ReaderT HandlerConfig Handler a
+    } deriving (Functor, Applicative, Monad, MonadReader HandlerConfig, MonadError ServantErr, MonadIO)
+
+appToServer :: HandlerConfig -> App :~> Handler
+appToServer cfg = NT (flip runReaderT cfg . runApp)
+
+runDB :: (MonadReader HandlerConfig m, MonadIO m) => SqlPersistT IO b -> m b
+runDB query = do
+    db <- asks db
+    liftIO $ runSqlPool query db

src/Main.hs

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+module Main where
+
+import Network.Wai
+import Network.Wai.Handler.Warp
+
+import API
+
+main :: IO ()
+main = runApp 3000 "pastecan.db"

src/Model.hs

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+{-# LANGUAGE EmptyDataDecls             #-}
+{-# LANGUAGE FlexibleContexts           #-}
+{-# LANGUAGE GADTs                      #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE MultiParamTypeClasses      #-}
+{-# LANGUAGE OverloadedStrings          #-}
+{-# LANGUAGE QuasiQuotes                #-}
+{-# LANGUAGE TemplateHaskell            #-}
+{-# LANGUAGE TypeFamilies               #-}
+{-# LANGUAGE DeriveGeneric              #-}
+{-# LANGUAGE FlexibleInstances          #-}
+
+module Model where
+
+import GHC.Generics
+import Database.Persist
+import Database.Persist.Sql
+import Database.Persist.TH
+
+import PasteType
+
+share [mkPersist sqlSettings, mkMigrate "migrateAll"] [persistLowerCase|
+User json
+    username String
+    Username username
+    deriving Show Generic
+
+Paste json
+    parent UserId
+    name String
+    content String
+    type PasteType
+    deriving Show Generic
+|]
+
+doMigrations :: SqlPersistT IO ()
+doMigrations = runMigration migrateAll

src/PasteType.hs

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+-- This module only exists because of the GHC stage restriction.
+
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE DeriveGeneric #-}
+
+module PasteType where
+
+import Database.Persist.TH
+import GHC.Generics
+import Data.Aeson
+
+data PasteType = PlainText deriving (Show, Read, Eq, Generic)
+
+instance FromJSON PasteType
+instance ToJSON PasteType
+
+derivePersistField "PasteType"

stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+# resolver:
+#  name: custom-snapshot
+#  location: "./custom-snapshot.yaml"
+resolver: lts-9.3
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#   extra-dep: true
+#  subdirs:
+#  - auto-update
+#  - wai
+#
+# A package marked 'extra-dep: true' will only be built if demanded by a
+# non-dependency (i.e. a user package), and its test suites and benchmarks
+# will not be run. This is useful for tweaking upstream packages.
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+
+# Override default flag values for local packages and extra-deps
+flags: {}
+
+# Extra package databases containing global packages
+extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.5"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor