Merge v3
This commit is contained in:
Joe Nelson
+233
-230
@@ -3,14 +3,48 @@
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{-# LANGUAGE TypeSynonymInstances #-}
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{-# OPTIONS_GHC -fno-warn-orphans #-}
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module PostgREST.PgQuery where
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module PostgREST.PgQuery (
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fromQi
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, insertableValue
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, wrapQuery
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, asJson
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, callProc
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, unquoted
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, operators
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-- format functions
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, pgFmtLit
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, pgFmtIdent
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, pgFmtValue
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, pgFmtCondition
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, pgFmtColumn
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, pgFmtJsonPath
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, pgFmtTable
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, pgFmtField
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, pgFmtSelectItem
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, pgFmtAsJsonPath
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-- query fragments
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, sourceSubqueryName
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, orderF
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, countNoneF
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, countAllF
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, countF
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, locationF
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, asCsvF
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, asJsonSingleF
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, asJsonF
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, selectStarF
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, StatementT
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) where
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import qualified Hasql as H
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import qualified Hasql.Backend as B
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import qualified Hasql.Postgres as P
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import PostgREST.RangeQuery
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import PostgREST.Types (OrderTerm (..), QualifiedIdentifier(..))
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import PostgREST.Types
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import Control.Monad (join)
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import qualified Data.Aeson as JSON
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@@ -25,11 +59,10 @@ import Data.Scientific (FPFormat (..), formatScientific,
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import Data.String.Conversions (cs)
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import qualified Data.Text as T
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import Data.Vector (empty)
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import qualified Data.Vector as V
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import qualified Network.HTTP.Types.URI as Net
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import Text.Regex.TDFA ((=~))
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import Prelude
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import qualified Data.Map as M
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type PStmt = H.Stmt P.Postgres
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instance Monoid PStmt where
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@@ -37,81 +70,35 @@ instance Monoid PStmt where
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B.Stmt (query <> query') (params <> params') (prep && prep')
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mempty = B.Stmt "" empty True
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type StatementT = PStmt -> PStmt
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data JsonbPath =
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ColIdentifier T.Text
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| KeyIdentifier T.Text
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| SingleArrow JsonbPath JsonbPath
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| DoubleArrow JsonbPath JsonbPath
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deriving (Show)
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limitT :: Maybe NonnegRange -> StatementT
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limitT r q =
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q <> B.Stmt (" LIMIT " <> limit <> " OFFSET " <> offset <> " ") empty True
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where
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limit = maybe "ALL" (cs . show) $ join $ rangeLimit <$> r
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offset = cs . show $ fromMaybe 0 $ rangeOffset <$> r
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operators :: [(T.Text, T.Text)]
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operators = [
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("eq", "="),
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("gte", ">="), -- has to be before gt (parsers)
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("gt", ">"),
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("lte", "<="), -- has to be before lt (parsers)
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("lt", "<"),
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("neq", "<>"),
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("like", "like"),
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("ilike", "ilike"),
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("in", "in"),
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("notin", "not in"),
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("isnot", "is not"), -- has to be before is (parsers)
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("is", "is"),
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("@@", "@@"),
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("@>", "@>"),
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("<@", "<@")
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]
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whereT :: QualifiedIdentifier -> Net.Query -> StatementT
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whereT table params q =
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if L.null cols
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then q
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else q <> B.Stmt " where " empty True <> conjunction
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where
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cols = [ col | col <- params, fst col `notElem` ["order","select"] ]
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wherePredTable = wherePred table
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conjunction = mconcat $ L.intersperse andq (map wherePredTable cols)
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withT :: PStmt -> T.Text -> StatementT
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withT (B.Stmt eq ep epre) v (B.Stmt wq wp wpre) =
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B.Stmt ("WITH " <> v <> " AS (" <> eq <> ") " <> wq <> " from " <> v)
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(ep <> wp)
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(epre && wpre)
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orderT :: [OrderTerm] -> StatementT
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orderT ts q =
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if L.null ts
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then q
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else q <> B.Stmt " order by " empty True <> clause
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where
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clause = mconcat $ L.intersperse commaq (map queryTerm ts)
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queryTerm :: OrderTerm -> PStmt
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queryTerm t = B.Stmt
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(" " <> cs (pgFmtIdent $ otTerm t) <> " "
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<> cs (otDirection t) <> " "
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<> maybe "" cs (otNullOrder t) <> " ")
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empty True
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parentheticT :: StatementT
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parentheticT s =
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s { B.stmtTemplate = " (" <> B.stmtTemplate s <> ") " }
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iffNotT :: PStmt -> StatementT
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iffNotT (B.Stmt aq ap apre) (B.Stmt bq bp bpre) =
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B.Stmt
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("WITH aaa AS (" <> aq <> " returning *) " <>
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bq <> " WHERE NOT EXISTS (SELECT * FROM aaa)")
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(ap <> bp)
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(apre && bpre)
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countT :: StatementT
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countT s =
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s { B.stmtTemplate = "WITH qqq AS (" <> B.stmtTemplate s <> ") SELECT pg_catalog.count(1) FROM qqq" }
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countRows :: QualifiedIdentifier -> PStmt
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countRows t = B.Stmt ("select pg_catalog.count(1) from " <> fromQi t) empty True
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countNone :: PStmt
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countNone = B.Stmt "select null" empty True
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asCsvWithCount :: QualifiedIdentifier -> StatementT
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asCsvWithCount table = withCount . asCsv table
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asCsv :: QualifiedIdentifier -> StatementT
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asCsv table s = s {
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B.stmtTemplate =
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"(select string_agg(quote_ident(column_name::text), ',') from "
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<> "(select column_name from information_schema.columns where quote_ident(table_schema) || '.' || table_name = '"
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<> fromQi table <> "' order by ordinal_position) h) || '\r' || "
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<> "coalesce(string_agg(substring(t::text, 2, length(t::text) - 2), '\r'), '') from ("
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<> B.stmtTemplate s <> ") t" }
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asJsonWithCount :: StatementT
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asJsonWithCount = withCount . asJson
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operatorsMap :: M.Map T.Text T.Text
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operatorsMap = M.fromList operators
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asJson :: StatementT
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asJson s = s {
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@@ -119,56 +106,6 @@ asJson s = s {
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"array_to_json(coalesce(array_agg(row_to_json(t)), '{}'))::character varying from ("
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<> B.stmtTemplate s <> ") t" }
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withCount :: StatementT
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withCount s = s { B.stmtTemplate = "pg_catalog.count(t), " <> B.stmtTemplate s }
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asJsonRow :: StatementT
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asJsonRow s = s { B.stmtTemplate = "row_to_json(t) from (" <> B.stmtTemplate s <> ") t" }
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returningStarT :: StatementT
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returningStarT s = s { B.stmtTemplate = B.stmtTemplate s <> " RETURNING *" }
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deleteFrom :: QualifiedIdentifier -> PStmt
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deleteFrom t = B.Stmt ("delete from " <> fromQi t) empty True
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insertInto :: QualifiedIdentifier
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-> V.Vector T.Text
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-> V.Vector (V.Vector JSON.Value)
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-> PStmt
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insertInto t cols vals
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| V.null cols = B.Stmt ("insert into " <> fromQi t <> " default values returning *") empty True
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| otherwise = B.Stmt
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("insert into " <> fromQi t <> " (" <>
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T.intercalate ", " (V.toList $ V.map pgFmtIdent cols) <>
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") values "
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<> T.intercalate ", "
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(V.toList $ V.map (\v -> "("
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<> T.intercalate ", " (V.toList $ V.map insertableValue v)
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<> ")"
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) vals
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)
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<> " returning row_to_json(" <> fromQi t <> ".*)")
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empty True
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insertSelect :: QualifiedIdentifier -> [T.Text] -> [JSON.Value] -> PStmt
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insertSelect t [] _ = B.Stmt
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("insert into " <> fromQi t <> " default values returning *") empty True
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insertSelect t cols vals = B.Stmt
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("insert into " <> fromQi t <> " ("
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<> T.intercalate ", " (map pgFmtIdent cols)
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<> ") select "
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<> T.intercalate ", " (map insertableValue vals))
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empty True
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update :: QualifiedIdentifier -> [T.Text] -> [JSON.Value] -> PStmt
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update t cols vals = B.Stmt
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("update " <> fromQi t <> " set ("
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<> T.intercalate ", " (map pgFmtIdent cols)
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<> ") = ("
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<> T.intercalate ", " (map insertableValue vals)
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<> ")")
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empty True
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callProc :: QualifiedIdentifier -> JSON.Object -> PStmt
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callProc qi params = do
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let args = T.intercalate "," $ map assignment (H.toList params)
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@@ -176,116 +113,19 @@ callProc qi params = do
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where
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assignment (n,v) = pgFmtIdent n <> ":=" <> insertableValue v
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wherePred :: QualifiedIdentifier -> Net.QueryItem -> PStmt
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wherePred table (col, predicate) =
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B.Stmt (notOp <> " " <> pgFmtJsonbPath table (cs col) <> " " <> op <> " " <>
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if opCode `elem` ["is","isnot"] then whiteList value
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else cs sqlValue)
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empty True
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where
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headPredicate:rest = T.split (=='.') $ cs $ fromMaybe "." predicate
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hasNot caseTrue caseFalse = if headPredicate == "not" then caseTrue else caseFalse
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opCode = hasNot (head rest) headPredicate
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notOp = hasNot headPredicate ""
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value = hasNot (T.intercalate "." $ tail rest) (T.intercalate "." rest)
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sqlValue = pgFmtValue opCode value
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op = pgFmtOperator opCode
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whiteList :: T.Text -> T.Text
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whiteList val = fromMaybe
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(cs (pgFmtLit val) <> "::unknown ")
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(L.find ((==) . T.toLower $ val) ["null","true","false"])
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pgFmtValue :: T.Text -> T.Text -> T.Text
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pgFmtValue opCode value =
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case opCode of
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"like" -> unknownLiteral $ T.map star value
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"ilike" -> unknownLiteral $ T.map star value
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"in" -> "(" <> T.intercalate ", " (map unknownLiteral $ T.split (==',') value) <> ") "
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"notin" -> "(" <> T.intercalate ", " (map unknownLiteral $ T.split (==',') value) <> ") "
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"@@" -> "to_tsquery(" <> unknownLiteral value <> ") "
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_ -> unknownLiteral value
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where
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star c = if c == '*' then '%' else c
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unknownLiteral = (<> "::unknown ") . pgFmtLit
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pgFmtOperator :: T.Text -> T.Text
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pgFmtOperator opCode =
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case opCode of
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"eq" -> "="
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"gt" -> ">"
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"lt" -> "<"
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"gte" -> ">="
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"lte" -> "<="
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"neq" -> "<>"
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"like"-> "like"
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"ilike"-> "ilike"
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"in" -> "in"
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"notin" -> "not in"
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"is" -> "is"
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"isnot" -> "is not"
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"@@" -> "@@"
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_ -> "="
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commaq :: PStmt
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commaq = B.Stmt ", " empty True
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andq :: PStmt
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andq = B.Stmt " and " empty True
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data JsonbPath =
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ColIdentifier T.Text
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| KeyIdentifier T.Text
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| SingleArrow JsonbPath JsonbPath
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| DoubleArrow JsonbPath JsonbPath
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deriving (Show)
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parseJsonbPath :: T.Text -> Maybe JsonbPath
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parseJsonbPath p =
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case T.splitOn "->>" p of
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[a,b] ->
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let i:is = T.splitOn "->" a in
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Just $ DoubleArrow
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(foldl SingleArrow (ColIdentifier i) (map KeyIdentifier is))
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(KeyIdentifier b)
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_ -> Nothing
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pgFmtJsonbPath :: QualifiedIdentifier -> T.Text -> T.Text
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pgFmtJsonbPath table p =
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pgFmtJsonbPath' $ fromMaybe (ColIdentifier p) (parseJsonbPath p)
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where
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pgFmtJsonbPath' (ColIdentifier i) = fromQi table <> "." <> pgFmtIdent i
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pgFmtJsonbPath' (KeyIdentifier i) = pgFmtLit i
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pgFmtJsonbPath' (SingleArrow a b) =
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pgFmtJsonbPath' a <> "->" <> pgFmtJsonbPath' b
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pgFmtJsonbPath' (DoubleArrow a b) =
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pgFmtJsonbPath' a <> "->>" <> pgFmtJsonbPath' b
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pgFmtIdent :: T.Text -> T.Text
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pgFmtIdent x =
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let escaped = T.replace "\"" "\"\"" (trimNullChars $ cs x) in
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if (cs escaped :: BS.ByteString) =~ danger
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then "\"" <> escaped <> "\""
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else escaped
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where danger = "^$|^[^a-z_]|[^a-z_0-9]" :: BS.ByteString
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pgFmtLit :: T.Text -> T.Text
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pgFmtLit x =
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let trimmed = trimNullChars x
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escaped = "'" <> T.replace "'" "''" trimmed <> "'"
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slashed = T.replace "\\" "\\\\" escaped in
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if T.isInfixOf "\\\\" escaped
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then "E" <> slashed
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else slashed
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trimNullChars :: T.Text -> T.Text
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trimNullChars = T.takeWhile (/= '\x0')
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fromQi :: QualifiedIdentifier -> T.Text
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fromQi t = pgFmtIdent (qiSchema t) <> "." <> pgFmtIdent (qiName t)
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fromQi t = (if s == "" then "" else pgFmtIdent s <> ".") <> pgFmtIdent n
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where
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n = qiName t
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s = qiSchema t
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unquoted :: JSON.Value -> T.Text
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unquoted (JSON.String t) = t
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@@ -301,6 +141,169 @@ insertableValue :: JSON.Value -> T.Text
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insertableValue JSON.Null = "null"
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insertableValue v = insertableText $ unquoted v
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paramFilter :: JSON.Value -> T.Text
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paramFilter JSON.Null = "is.null"
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paramFilter v = "eq." <> unquoted v
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wrapQuery :: T.Text -> [T.Text] -> T.Text -> Maybe NonnegRange -> T.Text
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wrapQuery source selectColumns returnSelect range =
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withSourceF source <>
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" SELECT " <>
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T.intercalate ", " selectColumns <>
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" " <>
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fromF returnSelect ( limitF range )
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-- query fragments
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sourceSubqueryName :: T.Text
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sourceSubqueryName = "pg_source"
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withSourceF :: T.Text -> T.Text
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withSourceF s = "WITH " <> sourceSubqueryName <> " AS (" <> s <>")"
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countF :: T.Text
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countF = "pg_catalog.count(t)"
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countAllF :: T.Text
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countAllF = "(SELECT pg_catalog.count(1) FROM (SELECT * FROM " <> sourceSubqueryName <> ") a )"
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countNoneF :: T.Text
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countNoneF = "null"
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asJsonF :: T.Text
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asJsonF = "array_to_json(array_agg(row_to_json(t)))::character varying"
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asJsonSingleF :: T.Text --TODO! unsafe when the query actually returns multiple rows, used only on inserting and returning single element
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asJsonSingleF = "string_agg(row_to_json(t)::text, ',')::character varying "
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asCsvF :: T.Text
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asCsvF = asCsvHeaderF <> " || '\n' || " <> asCsvBodyF
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asCsvHeaderF :: T.Text
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asCsvHeaderF =
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"(SELECT string_agg(a.k, ',')" <>
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" FROM (" <>
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" SELECT json_object_keys(r)::TEXT as k" <>
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" FROM ( " <>
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" SELECT row_to_json(hh) as r from " <> sourceSubqueryName <> " as hh limit 1" <>
|
||||
" ) s" <>
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||||
" ) a" <>
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")"
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||||
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asCsvBodyF :: T.Text
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asCsvBodyF = "coalesce(string_agg(substring(t::text, 2, length(t::text) - 2), '\n'), '')"
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selectStarF :: T.Text
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selectStarF = "SELECT * FROM " <> sourceSubqueryName
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fromF :: T.Text -> T.Text -> T.Text
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fromF sel limit = "FROM (" <> sel <> " " <> limit <> ") t"
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limitF :: Maybe NonnegRange -> T.Text
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||||
limitF r = "LIMIT " <> limit <> " OFFSET " <> offset
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||||
where
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||||
limit = maybe "ALL" (cs . show) $ join $ rangeLimit <$> r
|
||||
offset = cs . show $ fromMaybe 0 $ rangeOffset <$> r
|
||||
|
||||
locationF :: [T.Text] -> T.Text
|
||||
locationF pKeys =
|
||||
"(" <>
|
||||
" WITH s AS (SELECT row_to_json(ss) as r from " <> sourceSubqueryName <> " as ss limit 1)" <>
|
||||
" SELECT string_agg(json_data.key || '=' || coalesce( 'eq.' || json_data.value, 'is.null'), '&')" <>
|
||||
" FROM s, json_each_text(s.r) AS json_data" <>
|
||||
(
|
||||
if null pKeys
|
||||
then ""
|
||||
else " WHERE json_data.key IN ('" <> T.intercalate "','" pKeys <> "')"
|
||||
) <>
|
||||
")"
|
||||
|
||||
orderF :: [OrderTerm] -> T.Text
|
||||
orderF ts =
|
||||
if L.null ts
|
||||
then ""
|
||||
else "ORDER BY " <> clause
|
||||
where
|
||||
clause = T.intercalate "," (map queryTerm ts)
|
||||
queryTerm :: OrderTerm -> T.Text
|
||||
queryTerm t = " "
|
||||
<> cs (pgFmtIdent $ otTerm t) <> " "
|
||||
<> cs (otDirection t) <> " "
|
||||
<> maybe "" cs (otNullOrder t) <> " "
|
||||
|
||||
-- formating functions
|
||||
|
||||
pgFmtValue :: T.Text -> T.Text -> T.Text
|
||||
pgFmtValue opCode val =
|
||||
case opCode of
|
||||
"like" -> unknownLiteral $ T.map star val
|
||||
"ilike" -> unknownLiteral $ T.map star val
|
||||
"in" -> "(" <> T.intercalate ", " (map unknownLiteral $ T.split (==',') val) <> ") "
|
||||
"notin" -> "(" <> T.intercalate ", " (map unknownLiteral $ T.split (==',') val) <> ") "
|
||||
"@@" -> "to_tsquery(" <> unknownLiteral val <> ") "
|
||||
_ -> unknownLiteral val
|
||||
where
|
||||
star c = if c == '*' then '%' else c
|
||||
unknownLiteral = (<> "::unknown ") . pgFmtLit
|
||||
|
||||
pgFmtOperator :: T.Text -> T.Text
|
||||
pgFmtOperator opCode = fromMaybe "=" $ M.lookup opCode operatorsMap
|
||||
|
||||
pgFmtIdent :: T.Text -> T.Text
|
||||
pgFmtIdent x =
|
||||
let escaped = T.replace "\"" "\"\"" (trimNullChars $ cs x) in
|
||||
if (cs escaped :: BS.ByteString) =~ danger
|
||||
then "\"" <> escaped <> "\""
|
||||
else escaped
|
||||
|
||||
where danger = "^$|^[^a-z_]|[^a-z_0-9]" :: BS.ByteString
|
||||
|
||||
pgFmtLit :: T.Text -> T.Text
|
||||
pgFmtLit x =
|
||||
let trimmed = trimNullChars x
|
||||
escaped = "'" <> T.replace "'" "''" trimmed <> "'"
|
||||
slashed = T.replace "\\" "\\\\" escaped in
|
||||
if T.isInfixOf "\\\\" escaped
|
||||
then "E" <> slashed
|
||||
else slashed
|
||||
|
||||
pgFmtCondition :: QualifiedIdentifier -> Filter -> T.Text
|
||||
pgFmtCondition table (Filter (col,jp) ops val) =
|
||||
notOp <> " " <> sqlCol <> " " <> pgFmtOperator opCode <> " " <>
|
||||
if opCode `elem` ["is","isnot"] then whiteList (getInner val) else sqlValue
|
||||
where
|
||||
headPredicate:rest = T.split (=='.') ops
|
||||
hasNot caseTrue caseFalse = if headPredicate == "not" then caseTrue else caseFalse
|
||||
opCode = hasNot (head rest) headPredicate
|
||||
notOp = hasNot headPredicate ""
|
||||
sqlCol = case val of
|
||||
VText _ -> pgFmtColumn table col <> pgFmtJsonPath jp
|
||||
VForeignKey qi _ -> pgFmtColumn qi col
|
||||
sqlValue = valToStr val
|
||||
getInner v = case v of
|
||||
VText s -> s
|
||||
_ -> ""
|
||||
valToStr v = case v of
|
||||
VText s -> pgFmtValue opCode s
|
||||
VForeignKey (QualifiedIdentifier s _) (ForeignKey Column{colTable=Table{tableName=ft}, colName=fc}) -> pgFmtColumn qi fc
|
||||
where qi = QualifiedIdentifier (if ft == sourceSubqueryName then "" else s) ft
|
||||
_ -> ""
|
||||
|
||||
pgFmtColumn :: QualifiedIdentifier -> T.Text -> T.Text
|
||||
pgFmtColumn table "*" = fromQi table <> ".*"
|
||||
pgFmtColumn table c = fromQi table <> "." <> pgFmtIdent c
|
||||
|
||||
pgFmtJsonPath :: Maybe JsonPath -> T.Text
|
||||
pgFmtJsonPath (Just [x]) = "->>" <> pgFmtLit x
|
||||
pgFmtJsonPath (Just (x:xs)) = "->" <> pgFmtLit x <> pgFmtJsonPath ( Just xs )
|
||||
pgFmtJsonPath _ = ""
|
||||
|
||||
pgFmtTable :: Table -> T.Text
|
||||
pgFmtTable Table{tableSchema=s, tableName=n} = fromQi $ QualifiedIdentifier s n
|
||||
|
||||
pgFmtField :: QualifiedIdentifier -> Field -> T.Text
|
||||
pgFmtField table (c, jp) = pgFmtColumn table c <> pgFmtJsonPath jp
|
||||
|
||||
pgFmtSelectItem :: QualifiedIdentifier -> SelectItem -> T.Text
|
||||
pgFmtSelectItem table (f@(_, jp), Nothing) = pgFmtField table f <> pgFmtAsJsonPath jp
|
||||
pgFmtSelectItem table (f@(_, jp), Just cast ) = "CAST (" <> pgFmtField table f <> " AS " <> cast <> " )" <> pgFmtAsJsonPath jp
|
||||
|
||||
pgFmtAsJsonPath :: Maybe JsonPath -> T.Text
|
||||
pgFmtAsJsonPath Nothing = ""
|
||||
pgFmtAsJsonPath (Just xx) = " AS " <> last xx
|
||||
|
||||
Reference in New Issue
Block a user