feat: add /import route for recipe URL import

package.yaml

@@ -41,6 +41,7 @@ dependencies:
   - http-types
   - optparse-applicative
   - parsec
+  - process
   - text
   - time
   - wai

roux-server.cabal

@@ -18,6 +18,7 @@ library
   exposed-modules:
       Data.CookLang
       Roux
+      Roux.CooklangPrint
       Roux.Html
       Roux.NYTimes
       Roux.Parser
@@ -52,6 +53,7 @@ library
     , json-fleece-core
     , optparse-applicative
     , parsec
+    , process
     , text
     , time
     , wai
@@ -87,6 +89,7 @@ executable check-recipes
     , json-fleece-core
     , optparse-applicative
     , parsec
+    , process
     , roux-server
     , text
     , time
@@ -123,6 +126,7 @@ executable roux-server
     , json-fleece-core
     , optparse-applicative
     , parsec
+    , process
     , roux-server
     , text
     , time
@@ -165,6 +169,7 @@ test-suite roux-server-test
     , json-fleece-core
     , optparse-applicative
     , parsec
+    , process
     , roux-server
     , tasty
     , tasty-golden

src/Roux/Server.hs

@@ -41,8 +41,28 @@ import System.FSNotify (
  )
 import System.FilePath (makeRelative, (</>))
 
+import qualified Data.Aeson as A
+import qualified Data.ByteString as BS
+import Data.Maybe (mapMaybe)
+import qualified Data.Text.Encoding as TE
+import qualified Roux.CooklangPrint as CooklangPrint
 import qualified Roux.Html as Html
 import qualified Roux.RecipeIndex as Idx
+import Roux.SchemaOrg (SchemaOrgRecipe (..), parseSchemaOrgRecipe, schemaOrgToCooklang)
+import System.Exit (ExitCode (..))
+import System.Process (readProcessWithExitCode)
+
+-- | Read the full request body as a lazy ByteString.
+readRequestBody :: Wai.Request -> IO LB.ByteString
+readRequestBody req = do
+    chunks <- gather []
+    pure (LB.fromChunks chunks)
+  where
+    gather acc = do
+        chunk <- Wai.getRequestBodyChunk req
+        if BS.null chunk
+            then pure (reverse acc)
+            else gather (chunk : acc)
 
 {- | Build the WAI 'Application' given a path to the recipe directory.
 
@@ -71,7 +91,7 @@ app recipeDir = do
         forkIO $
             watchRecipes absDir state changeLog `catch` \e ->
                 putStrLn $ "[roux] watcher thread crashed: " <> show (e :: SomeException)
-    pure (router state changeLog)
+    pure (router absDir state changeLog)
   where
     isRight (Right _) = True
     isRight (Left _) = False
@@ -152,13 +172,109 @@ sseHandler changeLog _request respond = do
             sendPing
             go `finally` pure ()
 
--- | Route requests — SSE endpoint or recipe pages.
+-- | Route requests — SSE endpoint, recipe pages, or import.
-router :: IORef (Map FilePath Idx.RecipeInfo) -> ChangeLog -> Wai.Application
+router :: FilePath -> IORef (Map FilePath Idx.RecipeInfo) -> ChangeLog -> Wai.Application
-router state changeLog request respond =
+router recipeDir state changeLog request respond =
     case Wai.pathInfo request of
         ["events"] -> sseHandler changeLog request respond
+        ["import"] -> importHandler recipeDir state request respond
         _ -> handleRequest state request respond
 
+{- | Handle GET and POST requests to /import.
+GET  — show the import form.
+POST — scrape the URL, convert to Cooklang, save the file.
+-}
+importHandler :: FilePath -> IORef (Map FilePath Idx.RecipeInfo) -> Wai.Application
+importHandler recipeDir _state request respond =
+    case Wai.requestMethod request of
+        "GET" ->
+            respond (htmlResponse (Html.importPage Nothing))
+        "POST" -> do
+            body <- readRequestBody request
+            let params = parseFormBody body
+                url = maybe "" id (lookup "url" params)
+            if T.null url
+                then respond (htmlResponse (Html.importPage (Just ("URL is required" :: Text))))
+                else do
+                    result <- try $ runImportPipeline recipeDir url
+                    case result of
+                        Left (e :: SomeException) ->
+                            respond $
+                                htmlResponse $
+                                    Html.importResultPage $
+                                        Html.ImportError ("Unexpected error: " <> T.pack (show e))
+                        Right (Left err) ->
+                            respond $
+                                htmlResponse $
+                                    Html.importResultPage err
+                        Right (Right filename) ->
+                            respond $
+                                Wai.responseLBS
+                                    HTTP.status303
+                                    [("Location", "/recipes/" <> TE.encodeUtf8 (T.pack filename))]
+                                    ""
+        _ -> respond notFound
+
+-- | Parse URL-encoded form body into key-value pairs.
+parseFormBody :: LB.ByteString -> [(Text, Text)]
+parseFormBody body =
+    let decoded = TE.decodeUtf8 $ LB.toStrict body
+        parts = T.splitOn "&" decoded
+     in mapMaybe parsePair parts
+  where
+    parsePair part = case T.splitOn "=" part of
+        [key, val] -> Just (urldecode key, urldecode val)
+        _ -> Nothing
+    urldecode = T.pack . Html.urlDecode . T.replace "+" " "
+
+-- | Run the full import pipeline: scrape -> parse -> convert -> render -> save.
+runImportPipeline :: FilePath -> Text -> IO (Either Html.ImportError FilePath)
+runImportPipeline recipeDir url = do
+    -- Step 1: scrape the URL
+    (exitCode, stdout, stderr) <-
+        readProcessWithExitCode
+            "scripts/scrape-recipe"
+            ["--pretty", T.unpack url]
+            ""
+    case exitCode of
+        ExitFailure _ ->
+            return $
+                Left $
+                    Html.ImportError $
+                        "Could not scrape URL. The scraper exited with: " <> T.pack stderr
+        ExitSuccess -> do
+            -- Step 2: decode stdout (String) as JSON Value
+            -- stdout from readProcessWithExitCode is a locale-decoded String;
+            -- re-encode to UTF-8 for JSON decoding.
+            let jsonBytes = LB.fromStrict (TE.encodeUtf8 (T.pack stdout))
+                jsonVal = A.decode jsonBytes :: Maybe A.Value
+            case jsonVal of
+                Nothing ->
+                    return $
+                        Left $
+                            Html.ImportError $
+                                "Could not parse JSON from scraper output."
+                Just val -> case parseSchemaOrgRecipe val of
+                    Nothing ->
+                        return $
+                            Left $
+                                Html.ImportError $
+                                    "Could not parse recipe data. The page may not have schema.org recipe data."
+                    Just schema -> case schemaOrgToCooklang schema of
+                        Left err ->
+                            return $
+                                Left $
+                                    Html.ImportError $
+                                        "Could not convert recipe: " <> T.pack err
+                        Right recipe -> do
+                            -- Step 3: render to Cooklang text
+                            let cookText = CooklangPrint.renderRecipe recipe
+                                filename = CooklangPrint.filenameFromTitle (soName schema)
+                                filepath = recipeDir </> filename
+                            -- Step 4: write the .cook file
+                            BS.writeFile filepath (TE.encodeUtf8 cookText)
+                            return $ Right filename
+
 {- | Watch a directory for .cook file changes and update the shared state.
 Uses watchDir callback for simplicity.
 -}