commit 3619e9390b2f0df2bfa2a56f584aaa6e58cba06b
Author: Akshay Mankar <itsakshaymankar@gmail.com>
Date: Wed Oct 25 00:15:11 2023 +0200
Scrape and send to 1 chat
diff --git a/berlin-scraper/CHANGELOG.md b/berlin-scraper/CHANGELOG.md
new file mode 100644
index 0000000..7641c1e
--- /dev/null
+++ b/berlin-scraper/CHANGELOG.md
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+# Revision history for berlin-scraper
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/berlin-scraper/LICENSE b/berlin-scraper/LICENSE
new file mode 100644
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--- /dev/null
+++ b/berlin-scraper/LICENSE
@@ -0,0 +1,661 @@
+ GNU AFFERO GENERAL PUBLIC LICENSE
+ Version 3, 19 November 2007
+
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+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source. For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code. There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/berlin-scraper/app/Main.hs b/berlin-scraper/app/Main.hs
new file mode 100644
index 0000000..6d6f66d
--- /dev/null
+++ b/berlin-scraper/app/Main.hs
@@ -0,0 +1,235 @@
+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedRecordDot #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module Main where
+
+import Control.Lens (view)
+import Control.Monad (when)
+import Control.Monad.IO.Class
+import Data.Aeson hiding (Options)
+import Data.Aeson qualified as Aeson
+import Data.ByteString.Lazy qualified as LBS
+import Data.Maybe (fromJust, fromMaybe, listToMaybe)
+import Data.Text qualified as Text
+import Data.Text.Encoding qualified as Text
+import Data.Text.IO qualified as Text
+import Database.SQLite.Simple
+import GHC.Generics
+import Network.Wreq hiding (Options)
+import Options.Generic
+import System.Exit (exitFailure)
+import Telegram.Bot.API
+import Telegram.Bot.Simple
+import Telegram.Bot.Simple.Debug
+import Text.HTML.Scalpel
+
+main :: IO ()
+main = do
+ opts <- unwrapRecord "Berlin Scrapper"
+ token <- getEnvToken "TELEGRAM_BOT_TOKEN"
+ clientEnv <- defaultTelegramClientEnv token
+ startBot (traceBotDefault $ botApp opts) clientEnv >>= \case
+ Left err -> do
+ putStrLn $ "Bot failed with: " <> show err
+ exitFailure
+ _ -> pure ()
+
+-- * Types
+
+newtype Options w = Options {dbFile :: w ::: FilePath <?> "Path to the sqlite database"}
+ deriving (Generic)
+
+instance ParseRecord (Options Wrapped)
+
+data Offer = Offer
+ { id_ :: Text,
+ title :: Text,
+ address :: Maybe Text,
+ rooms :: Maybe Double,
+ area :: Maybe Double,
+ availableFrom :: Maybe Text,
+ link :: Text
+ }
+ deriving (Show, Generic)
+
+instance FromRow Offer
+
+instance ToRow Offer
+
+data IBWResponse = IBWResponse
+ { headline :: Text,
+ searchresults :: Text
+ }
+ deriving (Generic)
+
+instance FromJSON IBWResponse
+
+-- * Parsing
+
+queryIBW :: IO IBWResponse
+queryIBW = do
+ let reqBody =
+ [ partText "q" "wf-save-srch",
+ partText "save" "false",
+ partText "heizung_zentral" "false",
+ partText "heizung_etage" "false",
+ partText "energy_fernwaerme" "false",
+ partText "heizung_nachtstrom" "false",
+ partText "heizung_ofen" "false",
+ partText "heizung_gas" "false",
+ partText "heizung_oel" "false",
+ partText "heizung_solar" "false",
+ partText "heizung_erdwaerme" "false",
+ partText "heizung_fussboden" "false",
+ partText "seniorenwohnung" "false",
+ partText "maisonette" "false",
+ partText "etagen_dg" "false",
+ partText "balkon_loggia_terrasse" "false",
+ partText "garten" "false",
+ partText "wbs" "0",
+ partText "barrierefrei" "false",
+ partText "gaeste_wc" "false",
+ partText "aufzug" "false",
+ partText "stellplatz" "false",
+ partText "keller" "false",
+ partText "badewanne" "false",
+ partText "dusche" "false",
+ partText "bez[]" "01_00",
+ partText "bez[]" "02_00",
+ partText "bez[]" "04_00",
+ partText "bez[]" "07_00",
+ partText "bez[]" "08_00",
+ partText "bez[]" "09_00",
+ partText "bez[]" "11_00"
+ ]
+ let link = "https://inberlinwohnen.de/wp-content/themes/ibw/skript/wohnungsfinder.php"
+ resBS <- view responseBody <$> post link reqBody
+ pure $ fromJust $ decode @IBWResponse resBS
+
+scrapeOffers :: Scraper Text [Offer]
+scrapeOffers = do
+ let listItemsSelector = "div" @: [hasClass "result-list"] // "ul" // "li"
+ chroots listItemsSelector scrapeOffer
+
+scrapeOffer :: Scraper Text Offer
+scrapeOffer = do
+ title <- Text.strip <$> text "h3"
+
+ let tableSelector = "div" @: [hasClass "tb-merkdetails"] // "div" @: [hasClass "span_wflist_data"] // "table" @: [hasClass "fullw"] // "tbody"
+ rowsSelector = tableSelector // "tr"
+ tableDataParser = do
+ thVal <- text "th"
+ (Text.strip thVal,) <$> text "td"
+ allTableData <- chroots rowsSelector tableDataParser
+ let address = lookup "Adresse:" allTableData
+ roomsStr = lookup "Zimmeranzahl:" allTableData
+ rooms = readEuropeanNumber <$> roomsStr
+ areaStr = lookup "Wohnfläche:" allTableData
+ area = readEuropeanNumber <$> (Text.stripSuffix " m²" =<< areaStr)
+ availableFrom = lookup "Bezugsfertig ab:" allTableData
+
+ link <- attr "href" $ "a" @: [hasClass "org-but"]
+ id_ <- attr "id" "li"
+ pure Offer {..}
+
+readEuropeanNumber :: Text -> Double
+readEuropeanNumber x = do
+ read $ Text.unpack $ Text.replace "," "." x
+
+-- * SQLite
+
+insertOffer :: Connection -> Offer -> IO ()
+insertOffer conn =
+ execute conn "INSERT INTO offers (id, title, address, rooms, area, availableFrom, link) VALUES (?, ?, ?, ?, ?, ?, ?)"
+
+getOffer :: Connection -> Text -> IO (Maybe Offer)
+getOffer conn offerId =
+ listToMaybe <$> query conn "SELECT * from offers where id = ?" (Only offerId)
+
+createTable :: Connection -> IO ()
+createTable conn =
+ execute_ conn "CREATE TABLE IF NOT EXISTS offers (id TEXT PRIMARY KEY, title TEXT, address TEXT, rooms REAL, area REAL, availableFrom TEXT, link TEXT)"
+
+saveOffer :: Connection -> Offer -> IO Bool
+saveOffer conn offer = do
+ getOffer conn offer.id_ >>= \case
+ Nothing -> do
+ insertOffer conn offer
+ pure True
+ _ -> pure False
+
+-- * Telegram
+
+type Model = ()
+
+newtype Action = StartChat Chat
+ deriving (Show)
+
+botApp :: Options Unwrapped -> BotApp Model Action
+botApp opts =
+ BotApp
+ { botInitialModel = (),
+ botAction = action,
+ botHandler = handler,
+ botJobs = [scrapeJob opts]
+ }
+
+action :: Update -> Model -> Maybe Action
+action update _ = do
+ msg <- update.updateMessage
+ txt <- msg.messageText
+ if txt == "/start"
+ then pure $ StartChat msg.messageChat
+ else Nothing
+
+handler :: Action -> Model -> Eff Action Model
+handler (StartChat chat) model =
+ model <# do
+ liftIO $ putStrLn $ "Chat started! " <> ppAsJSON chat
+
+scrapeJob :: Options Unwrapped -> BotJob Model Action
+scrapeJob opts =
+ BotJob
+ { botJobSchedule = "* * * * *",
+ botJobTask = scrapeJobTask opts
+ }
+
+scrapeJobTask :: Options Unwrapped -> Model -> Eff Action Model
+scrapeJobTask opts m =
+ m <# do
+ liftIO $ putStrLn "Starting scrape job"
+ res <- liftIO queryIBW
+ let offers = fromJust $ scrapeStringLike res.searchresults scrapeOffers
+ liftIO $ putStrLn "Fetched offers"
+ conn <- liftIO $ open (dbFile opts)
+ liftIO $ createTable conn
+ mapM_
+ ( \offer -> do
+ isNewOffer <- liftIO $ saveOffer conn offer
+ when isNewOffer $ do
+ liftIO $ putStrLn "Found a new offer"
+ notify offer
+ )
+ offers
+
+notify :: Offer -> BotM ()
+notify offer = do
+ let offerTitle = "<b><u>" <> offer.title <> "</u></b>"
+ offerAddress = "<b>Address:</b> " <> fromMaybe "N/A" offer.address
+ offerRooms = "<b>Rooms:</b> " <> maybe "N/A" (Text.pack . show) offer.rooms
+ offerArea = "<b>Area:</b> " <> maybe "N/A" ((<> " m²") . Text.pack . show) offer.area
+ offerLink = "<a href=\"https://inberlinwohnen.de" <> offer.link <> "\" >Apply Here</a>"
+ offerBody = offerAddress <> "\n" <> offerRooms <> "\n" <> offerArea <> "\n" <> offerLink
+ offerText = offerTitle <> "\n\n" <> offerBody
+ sendMsgReq = (defSendMessage (SomeChatId $ ChatId 952512153) offerText) {sendMessageParseMode = Just HTML}
+ res <- runTG sendMsgReq
+ liftIO $
+ if res.responseOk
+ then putStrLn "Notified successfully"
+ else do
+ putStrLn $ "Failed to notify the offer: " <> show offer
+ Text.putStrLn $ "Response: " <> Text.decodeUtf8 (LBS.toStrict $ Aeson.encode res)
diff --git a/berlin-scraper/berlin-scraper.cabal b/berlin-scraper/berlin-scraper.cabal
new file mode 100644
index 0000000..2f51f60
--- /dev/null
+++ b/berlin-scraper/berlin-scraper.cabal
@@ -0,0 +1,30 @@
+cabal-version: 3.0
+name: berlin-scraper
+version: 0.1.0.0
+license: AGPL-3.0-or-later
+license-file: LICENSE
+author: Akshay Mankar
+maintainer: itsakshaymankar@gmail.com
+category: Web
+build-type: Simple
+extra-doc-files: CHANGELOG.md
+
+common warnings
+ ghc-options: -Wall
+
+executable berlin-scraper
+ import: warnings
+ main-is: Main.hs
+ build-depends: base ^>=4.17.1.0
+ , scalpel
+ , aeson
+ , wreq
+ , text
+ , lens
+ , sqlite-simple
+ , optparse-generic
+ , telegram-bot-simple
+ , telegram-bot-api
+ , bytestring
+ hs-source-dirs: app
+ default-language: GHC2021
diff --git a/berlin-scraper/default.nix b/berlin-scraper/default.nix
new file mode 100644
index 0000000..e85f4e5
--- /dev/null
+++ b/berlin-scraper/default.nix
@@ -0,0 +1,17 @@
+{ mkDerivation, aeson, base, bytestring, lens, lib
+, optparse-generic, scalpel, sqlite-simple, telegram-bot-api
+, telegram-bot-simple, text, wreq
+}:
+mkDerivation {
+ pname = "berlin-scraper";
+ version = "0.1.0.0";
+ src = ./.;
+ isLibrary = false;
+ isExecutable = true;
+ executableHaskellDepends = [
+ aeson base bytestring lens optparse-generic scalpel sqlite-simple
+ telegram-bot-api telegram-bot-simple text wreq
+ ];
+ license = lib.licenses.agpl3Plus;
+ mainProgram = "berlin-scraper";
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..abe2dae
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+ "nodes": {
+ "flake-utils": {
+ "inputs": {
+ "systems": "systems"
+ },
+ "locked": {
+ "lastModified": 1694529238,
+ "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+ "owner": "numtide",
+ "repo": "flake-utils",
+ "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+ "type": "github"
+ },
+ "original": {
+ "owner": "numtide",
+ "repo": "flake-utils",
+ "type": "github"
+ }
+ },
+ "nixpkgs": {
+ "locked": {
+ "lastModified": 1697915759,
+ "narHash": "sha256-WyMj5jGcecD+KC8gEs+wFth1J1wjisZf8kVZH13f1Zo=",
+ "owner": "NixOS",
+ "repo": "nixpkgs",
+ "rev": "51d906d2341c9e866e48c2efcaac0f2d70bfd43e",
+ "type": "github"
+ },
+ "original": {
+ "owner": "NixOS",
+ "ref": "nixpkgs-unstable",
+ "repo": "nixpkgs",
+ "type": "github"
+ }
+ },
+ "root": {
+ "inputs": {
+ "flake-utils": "flake-utils",
+ "nixpkgs": "nixpkgs"
+ }
+ },
+ "systems": {
+ "locked": {
+ "lastModified": 1681028828,
+ "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+ "owner": "nix-systems",
+ "repo": "default",
+ "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+ "type": "github"
+ },
+ "original": {
+ "owner": "nix-systems",
+ "repo": "default",
+ "type": "github"
+ }
+ }
+ },
+ "root": "root",
+ "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..32d4244
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,37 @@
+{
+ description = "Dev Setup";
+
+ inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+ inputs.flake-utils.url = "github:numtide/flake-utils";
+
+ outputs = {nixpkgs, flake-utils, ...}:
+ flake-utils.lib.eachDefaultSystem (system:
+ let
+ pkgs = import nixpkgs { inherit system; };
+ ghcOverrides = hself: hsuper: rec {
+ berlin-scraper = hself.callPackage ./berlin-scraper {};
+ };
+ haskellPackages = pkgs.haskellPackages.override {
+ overrides = ghcOverrides;
+ };
+ in rec {
+ packages = rec {
+ dev-env = haskellPackages.shellFor {
+ packages = p: [ p.berlin-scraper ];
+ buildInputs = [
+ pkgs.haskellPackages.cabal-install
+ pkgs.haskell-language-server
+ pkgs.cabal2nix
+
+ # For cabal
+ pkgs.pkg-config
+ pkgs.binutils
+ pkgs.xq
+ pkgs.htmlq
+ pkgs.dasel
+ ];
+ };
+ };
+ defaultPackage = packages.dev-env;
+ });
+}