Setup commit, play around with Req, Aeson and Scotty

.gitignore

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+.stack-work/
+*~

README.md

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+# lisa
+
+> lightweight squeak access
+
+Webserver that offers an HTML-only interface to Squeak.

Setup.hs

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+import Distribution.Simple
+main = defaultMain

app/Main.hs

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+module Main where
+
+import Web.Scotty (scotty)
+
+import Lisa (app)
+
+main :: IO ()
+main = scotty 8080 app

lisa.cabal

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+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.34.4.
+--
+-- see: https://github.com/sol/hpack
+
+name:           lisa
+version:        0.1.0.0
+description:    Please see the README on GitHub at <https://github.com/pbrinkmeier/lisa#readme>
+homepage:       https://github.com/pbrinkmeier/lisa#readme
+bug-reports:    https://github.com/pbrinkmeier/lisa/issues
+author:         Paul Brinkmeier
+maintainer:     hallo@pbrinkmeier.de
+copyright:      Paul Brinkmeier (c) 2021
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+    README.md
+    ChangeLog.md
+
+source-repository head
+  type: git
+  location: https://github.com/pbrinkmeier/lisa
+
+library
+  exposed-modules:
+      Lisa
+      Lisa.Squeak
+  other-modules:
+      Paths_lisa
+  hs-source-dirs:
+      src
+  build-depends:
+      aeson >=2.0
+    , base >=4.7 && <5
+    , req >=3.10
+    , scotty >=0.12
+    , text >=1.0
+    , time
+  default-language: Haskell2010
+
+executable lisa-exe
+  main-is: Main.hs
+  other-modules:
+      Paths_lisa
+  hs-source-dirs:
+      app
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      aeson >=2.0
+    , base >=4.7 && <5
+    , lisa
+    , req >=3.10
+    , scotty >=0.12
+    , text >=1.0
+    , time
+  default-language: Haskell2010
+
+test-suite lisa-test
+  type: exitcode-stdio-1.0
+  main-is: Spec.hs
+  other-modules:
+      Paths_lisa
+  hs-source-dirs:
+      test
+  ghc-options: -threaded -rtsopts -with-rtsopts=-N
+  build-depends:
+      aeson >=2.0
+    , base >=4.7 && <5
+    , lisa
+    , req >=3.10
+    , scotty >=0.12
+    , text >=1.0
+    , time
+  default-language: Haskell2010

package.yaml

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+name:                lisa
+version:             0.1.0.0
+github:              "pbrinkmeier/lisa"
+license:             BSD3
+author:              "Paul Brinkmeier"
+maintainer:          "hallo@pbrinkmeier.de"
+copyright:           "Paul Brinkmeier (c) 2021"
+
+extra-source-files:
+- README.md
+- ChangeLog.md
+
+# Metadata used when publishing your package
+# synopsis:            Short description of your package
+# category:            Web
+
+# To avoid duplicated efforts in documentation and dealing with the
+# complications of embedding Haddock markup inside cabal files, it is
+# common to point users to the README.md file.
+description:         Please see the README on GitHub at <https://github.com/pbrinkmeier/lisa#readme>
+
+dependencies:
+- base >= 4.7 && < 5
+- aeson >= 2.0
+- req >= 3.10
+- scotty >= 0.12
+- text >= 1.0
+- time
+
+library:
+  source-dirs: src
+
+executables:
+  lisa-exe:
+    main:                Main.hs
+    source-dirs:         app
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - lisa
+    - scotty >= 0.12
+
+tests:
+  lisa-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - lisa

src/Lisa.hs

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+{-# LANGUAGE OverloadedStrings #-}
+
+module Lisa
+    ( app
+    ) where
+
+import Web.Scotty (ScottyM, get, html)
+
+app :: ScottyM ()
+app = get "/" $ do
+    html "<h1>It works!</h1>"

src/Lisa/Squeak.hs

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+{-# LANGUAGE OverloadedStrings #-}
+
+module Lisa.Squeak where
+
+import Data.Aeson (FromJSON(parseJSON), ToJSON(toJSON), Value, (.:), (.:?), (.=), object, withObject)
+import Data.Text (Text)
+import Data.Time.Calendar (Day)
+import Network.HTTP.Req (POST(..), ReqBodyJson(..), Req, https, jsonResponse, responseBody, req)
+
+data GQLQuery = GQLQuery
+    { gqlQueryQuery :: Text
+    }
+    deriving (Show)
+
+instance ToJSON GQLQuery where
+    toJSON (GQLQuery q) = object ["query" .= q]
+
+data GQLReply a = GQLReply
+    { gqlReplyData :: Maybe a
+    , gqlReplyErrors :: Maybe [GQLError]
+    }
+    deriving (Show)
+
+instance FromJSON a => FromJSON (GQLReply a) where
+    parseJSON = withObject "GQLReply" $ \v -> GQLReply
+        <$> v .: "data"
+        <*> v .:? "errors"
+
+data GQLError = GQLError
+    { gqlErrorMessage :: Text
+    }
+    deriving (Show)
+
+instance FromJSON GQLError where
+    parseJSON = withObject "GQLError" $ \v -> GQLError
+        <$> v .: "message"
+
+data Documents = Documents { getDocuments :: [Document] }
+    deriving (Show)
+
+instance FromJSON Documents where
+    parseJSON = withObject "Documents" $ \v -> Documents
+        <$> ((v .: "documents") >>= (.: "results"))
+
+data Document = Document
+    { documentId            :: Text
+    , documentDate          :: Day
+    , documentSemester      :: Text
+    , documentPublicComment :: Maybe Text
+    , documentFaculty       :: Faculty
+    , documentLectures      :: [Lecture]
+    }
+    deriving (Show)
+
+instance FromJSON Document where
+    parseJSON = withObject "Document" $ \v -> Document
+        <$> v .: "id"
+        <*> v .: "date"
+        <*> v .: "semester"
+        <*> v .: "publicComment"
+        <*> v .: "faculty"
+        <*> v .: "lectures"
+
+data Faculty = Faculty
+    { facultyId          :: Text
+    , facultyDisplayName :: Text
+    }
+    deriving (Show)
+
+instance FromJSON Faculty where
+    parseJSON = withObject "Faculty" $ \v -> Faculty
+        <$> v .: "id"
+        <*> v .: "displayName"
+
+data Lecture = Lecture
+    { lectureId          :: Text
+    , lectureDisplayName :: Text
+    }
+    deriving (Show)
+
+instance FromJSON Lecture where
+    parseJSON = withObject "Lecture" $ \v -> Lecture
+        <$> v .: "id"
+        <*> v .: "displayName"
+
+serverUrl = https "api.squeak-test.fsmi.uni-karlsruhe.de"
+
+getLectures :: Req (GQLReply Documents)
+getLectures = responseBody <$> req POST serverUrl (ReqBodyJson $ GQLQuery q) jsonResponse mempty
+    where q = "{ documents(filters: []) { results { id date semester publicComment faculty { id displayName } lectures { id displayName } } } }"

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
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver:
+  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/17.yaml
+
+# 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
+#   subdirs:
+#   - auto-update
+#   - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver.
+# These entries can reference officially published versions as well as
+# forks / in-progress versions pinned to a git hash. For example:
+#
+# extra-deps:
+# - acme-missiles-0.3
+# - git: https://github.com/commercialhaskell/stack.git
+#   commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#
+# 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: ">=2.7"
+#
+# 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

stack.yaml.lock

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+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages: []
+snapshots:
+- completed:
+    size: 619161
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/17.yaml
+    sha256: 7f47507fd037228a8d23cf830f5844e1f006221acebdd7cb49f2f5fb561e0546
+  original:
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/19/17.yaml

test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"