8 files changed, 208 insertions, 0 deletions
diff --git a/src/lib/haskell/FetchAd.hs b/src/lib/haskell/FetchAd.hs
new file mode 100644
index 0000000..a206181
--- /dev/null
+++ b/src/lib/haskell/FetchAd.hs
@@ -0,0 +1,36 @@
+module FetchAd
+  ( leboncoin
+  , ouestFrance
+  , seLoger
+  ) where
+
+import           Data.Either              (rights)
+import           Data.Text.Encoding       as T
+
+import           Model.Ad                 (Ad)
+import           Model.URL                (URL)
+import qualified Parser.LeboncoinParser   as LeboncoinParser
+import qualified Parser.OuestFranceParser as OuestFranceParser
+import qualified Parser.SeLogerParser     as SeLogerParser
+import qualified Utils.HTTP               as HTTP
+
+leboncoin :: [URL] -> IO [Ad]
+leboncoin urls =
+  fmap (concat . map LeboncoinParser.parse . rights)
+    . sequence
+    . map (HTTP.get T.decodeLatin1)
+    $ urls
+
+ouestFrance :: [URL] -> IO [Ad]
+ouestFrance urls =
+  fmap (concat . map OuestFranceParser.parse . rights)
+    . sequence
+    . map (HTTP.get T.decodeUtf8)
+    $ urls
+
+seLoger :: [URL] -> IO [Ad]
+seLoger urls =
+  fmap (concat . map SeLogerParser.parse . rights)
+    . sequence
+    . map (HTTP.get T.decodeUtf8)
+    $ urls
diff --git a/src/lib/haskell/Model/Ad.hs b/src/lib/haskell/Model/Ad.hs
new file mode 100644
index 0000000..06906eb
--- /dev/null
+++ b/src/lib/haskell/Model/Ad.hs
@@ -0,0 +1,22 @@
+module Model.Ad
+  ( Ad(..)
+  , getNewAds
+  ) where
+
+import           Data.List ((\\))
+import           Data.Text (Text)
+
+import           Model.URL (URL)
+
+data Ad = Ad
+  { name     :: Text
+  , location :: Text
+  , price    :: Maybe Text
+  , url      :: URL
+  } deriving (Eq, Read, Show)
+
+getNewAds :: [URL] -> [Ad] -> ([URL], [Ad])
+getNewAds viewdURLs ads =
+  let newURLs = (map url ads) \\ viewdURLs
+      newAds = filter (\ad -> elem (url ad) newURLs) ads
+  in  (newURLs, newAds)
diff --git a/src/lib/haskell/Model/URL.hs b/src/lib/haskell/Model/URL.hs
new file mode 100644
index 0000000..2114113
--- /dev/null
+++ b/src/lib/haskell/Model/URL.hs
@@ -0,0 +1,7 @@
+module Model.URL
+  ( URL
+  ) where
+
+import Data.Text
+
+type URL = Text
diff --git a/src/lib/haskell/Parser/LeboncoinParser.hs b/src/lib/haskell/Parser/LeboncoinParser.hs
new file mode 100644
index 0000000..77213cb
--- /dev/null
+++ b/src/lib/haskell/Parser/LeboncoinParser.hs
@@ -0,0 +1,24 @@
+module Parser.LeboncoinParser
+  ( parse
+  ) where
+
+import           Data.Maybe        (catMaybes)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Text.HTML.TagSoup
+
+import           Model.Ad          (Ad (Ad))
+import           Parser.Utils
+
+parse :: Text -> [Ad]
+parse page =
+  catMaybes . fmap parseAd $ partitions (~== (T.unpack "<a>")) tags
+  where tags = getTagsBetween "<li itemtype=http://schema.org/Offer>" "<div class=information-immo_content>" (parseTags page)
+
+parseAd :: [Tag Text] -> Maybe Ad
+parseAd tags = do
+  name <- getTagTextAfter "<h2 class=item_title>" tags
+  location <- getTagAttribute "<meta itemprop=address>" "content" tags
+  let price = getTagTextAfter "<h3 class=item_price>" tags
+  url <- getTagAttribute "<a>" "href" tags
+  return (Ad name location price (T.concat ["https:", url]))
diff --git a/src/lib/haskell/Parser/OuestFranceParser.hs b/src/lib/haskell/Parser/OuestFranceParser.hs
new file mode 100644
index 0000000..f46ed03
--- /dev/null
+++ b/src/lib/haskell/Parser/OuestFranceParser.hs
@@ -0,0 +1,25 @@
+module Parser.OuestFranceParser
+  ( parse
+  ) where
+
+import           Data.Maybe        (catMaybes)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Text.HTML.TagSoup
+
+import           Model.Ad          (Ad (Ad))
+import           Parser.Utils
+
+parse :: Text -> [Ad]
+parse page =
+  catMaybes . fmap parseAd $ partitions (~== (T.unpack "<a>")) tags
+  where tags = getTagsBetween "<div id=listAnnonces>" "<div id=interactions>" (parseTags page)
+
+parseAd :: [Tag Text] -> Maybe Ad
+parseAd tags = do
+  name <- getTagTextAfter "<span class=annTitre>" tags
+  location <- getTagTextAfter "<span class=annVille>" tags
+  let price = getTagTextAfter "<span class=annPrix>" tags
+  let startUrl = "https://www.ouestfrance-immo.com/"
+  url <- getTagAttribute "<a>" "href" tags
+  return (Ad name location price (T.concat [startUrl, url]))
diff --git a/src/lib/haskell/Parser/SeLogerParser.hs b/src/lib/haskell/Parser/SeLogerParser.hs
new file mode 100644
index 0000000..b073862
--- /dev/null
+++ b/src/lib/haskell/Parser/SeLogerParser.hs
@@ -0,0 +1,24 @@
+module Parser.SeLogerParser
+  ( parse
+  ) where
+
+import           Data.Maybe        (catMaybes)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Text.HTML.TagSoup
+
+import           Model.Ad          (Ad (Ad))
+import           Parser.Utils
+
+parse :: Text -> [Ad]
+parse page =
+  catMaybes . fmap parseAd $ partitions (~== (T.unpack "<div class=c-pa-info>")) tags
+  where tags = getTagsBetween "<section class=liste_resultat>" "<div class=bottomAnchorWrapper>" (parseTags page)
+
+parseAd :: [Tag Text] -> Maybe Ad
+parseAd tags = do
+  name <- getTagTextAfter "<a>" tags
+  location <- getTagTextAfter "<div class=c-pa-city>" tags
+  let price = getTagTextAfter "<span class=c-pa-cprice>" tags
+  url <- getTagAttribute "<a>" "href" tags
+  return (Ad name location price url)
diff --git a/src/lib/haskell/Parser/Utils.hs b/src/lib/haskell/Parser/Utils.hs
new file mode 100644
index 0000000..4768327
--- /dev/null
+++ b/src/lib/haskell/Parser/Utils.hs
@@ -0,0 +1,48 @@
+module Parser.Utils
+  ( getTagsBefore
+  , getTagsAfter
+  , getTagsBetween
+  , getTagAttributes
+  , getTagAttribute
+  , getTagTextAfter
+  ) where
+
+import           Data.List         (find, findIndex)
+import           Data.Maybe        (catMaybes, listToMaybe)
+import           Data.Text         (Text)
+import qualified Data.Text         as T
+import           Text.HTML.TagSoup
+
+getTagsBefore :: Text -> [Tag Text] -> [Tag Text]
+getTagsBefore selector = takeWhile (~/= (T.unpack selector))
+
+getTagsAfter :: Text -> [Tag Text] -> [Tag Text]
+getTagsAfter selector = drop 1 . dropWhile (~/= (T.unpack selector))
+
+getTagsBetween :: Text -> Text -> [Tag Text] -> [Tag Text]
+getTagsBetween begin end = getTagsBefore end . getTagsAfter begin
+
+getTagAttributes :: Text -> Text -> [Tag Text] -> [Text]
+getTagAttributes selector attribute =
+  catMaybes
+  . fmap (maybeTagAttribute attribute)
+  . filter (~== (T.unpack selector))
+
+getTagAttribute :: Text -> Text -> [Tag Text] -> Maybe Text
+getTagAttribute selector attribute =
+  listToMaybe
+  . getTagAttributes selector attribute
+
+getTagTextAfter :: Text -> [Tag Text] -> Maybe Text
+getTagTextAfter selector tags =
+  case findIndex (~== (T.unpack selector)) tags of
+    Just index -> fmap T.strip $ safeGetAt (index + 1) tags >>= maybeTagText
+    Nothing    -> Nothing
+
+maybeTagAttribute :: Text -> Tag Text -> Maybe Text
+maybeTagAttribute name (TagOpen _ xs) =
+  fmap snd . find (\(x, _) -> x == name) $ xs
+maybeTagAttribute _ _ = Nothing
+
+safeGetAt :: Int -> [a] -> Maybe a
+safeGetAt index = listToMaybe . drop index
diff --git a/src/lib/haskell/Utils/HTTP.hs b/src/lib/haskell/Utils/HTTP.hs
new file mode 100644
index 0000000..87635ce
--- /dev/null
+++ b/src/lib/haskell/Utils/HTTP.hs
@@ -0,0 +1,22 @@
+module Utils.HTTP
+  ( get
+  ) where
+
+import           Control.Exception    (SomeException, try)
+import           Data.ByteString      (ByteString)
+import qualified Data.ByteString.Lazy as BS
+import           Data.Text            (Text)
+import qualified Data.Text            as T
+import           Network.HTTP.Conduit
+
+import           Model.URL
+
+get :: (ByteString -> Text) -> URL -> IO (Either Text Text)
+get decode url = mapLeft (T.pack . show) <$> (try (unsafeGetPage decode url) :: IO (Either SomeException Text))
+
+unsafeGetPage :: (ByteString -> Text) -> URL -> IO Text
+unsafeGetPage decode url = (decode . BS.toStrict) <$> simpleHttp (T.unpack url)
+
+mapLeft :: (a -> c) -> Either a b -> Either c b
+mapLeft f (Left l)  = Left (f l)
+mapLeft _ (Right r) = (Right r)