[fix] SQL parsing of table names (apache#7490)

(cherry picked from commit 45b41aa)

superset/security.py

@@ -179,13 +179,11 @@ def datasource_access_by_name(
 
     def get_schema_and_table(self, table_in_query, schema):
         table_name_pieces = table_in_query.split('.')
-        if len(table_name_pieces) == 2:
-            table_schema = table_name_pieces[0]
-            table_name = table_name_pieces[1]
-        else:
-            table_schema = schema
-            table_name = table_name_pieces[0]
-        return (table_schema, table_name)
+        if len(table_name_pieces) == 3:
+            return tuple(table_name_pieces[1:])
+        elif len(table_name_pieces) == 2:
+            return tuple(table_name_pieces)
+        return (schema, table_name_pieces[0])
 
     def datasource_access_by_fullname(
             self, database, table_in_query, schema):

superset/sql_parse.py

@@ -16,10 +16,12 @@
 # under the License.
 # pylint: disable=C,R,W
 import logging
+from typing import Optional
 
 import sqlparse
-from sqlparse.sql import Identifier, IdentifierList, Token, TokenList
-from sqlparse.tokens import Keyword, Name
+from sqlparse.sql import Identifier, IdentifierList, remove_quotes, Token, TokenList
+from sqlparse.tokens import Keyword, Name, Punctuation, String, Whitespace
+from sqlparse.utils import imt
 
 RESULT_OPERATIONS = {'UNION', 'INTERSECT', 'EXCEPT', 'SELECT'}
 ON_KEYWORD = 'ON'
@@ -75,11 +77,34 @@ def get_statements(self):
         return statements
 
     @staticmethod
-    def __get_full_name(tlist: TokenList):
-        if len(tlist.tokens) > 2 and tlist.tokens[1].value == '.':
-            return '{}.{}'.format(tlist.tokens[0].value,
-                                  tlist.tokens[2].value)
-        return tlist.get_real_name()
+    def __get_full_name(tlist: TokenList) -> Optional[str]:
+        """
+        Return the full unquoted table name if valid, i.e., conforms to the following
+        [[cluster.]schema.]table construct.
+
+        :param tlist: The SQL tokens
+        :returns: The valid full table name
+        """
+
+        # Strip the alias if present.
+        idx = len(tlist.tokens)
+
+        if tlist.has_alias():
+            ws_idx, _ = tlist.token_next_by(t=Whitespace)
+
+            if ws_idx != -1:
+                idx = ws_idx
+
+        tokens = tlist.tokens[:idx]
+
+        if (
+            len(tokens) in (1, 3, 5) and
+            all(imt(token, t=[Name, String]) for token in tokens[0::2]) and
+            all(imt(token, m=(Punctuation, '.')) for token in tokens[1::2])
+        ):
+            return '.'.join([remove_quotes(token.value) for token in tokens[0::2]])
+
+        return None
 
     @staticmethod
     def __is_identifier(token: Token):

tests/sql_parse_tests.py

@@ -29,6 +29,12 @@ def test_simple_select(self):
         query = 'SELECT * FROM tbname'
         self.assertEquals({'tbname'}, self.extract_tables(query))
 
+        query = 'SELECT * FROM tbname foo'
+        self.assertEquals({'tbname'}, self.extract_tables(query))
+
+        query = 'SELECT * FROM tbname AS foo'
+        self.assertEquals({'tbname'}, self.extract_tables(query))
+
         # underscores
         query = 'SELECT * FROM tb_name'
         self.assertEquals({'tb_name'},
@@ -47,11 +53,40 @@ def test_simple_select(self):
             {'schemaname.tbname'},
             self.extract_tables('SELECT * FROM schemaname.tbname'))
 
-        # Ill-defined schema/table.
+        self.assertEquals(
+            {'schemaname.tbname'},
+            self.extract_tables('SELECT * FROM "schemaname"."tbname"'))
+
+        self.assertEquals(
+            {'schemaname.tbname'},
+            self.extract_tables('SELECT * FROM schemaname.tbname foo'))
+
+        self.assertEquals(
+            {'schemaname.tbname'},
+            self.extract_tables('SELECT * FROM schemaname.tbname AS foo'))
+
+        # cluster
+        self.assertEquals(
+            {'clustername.schemaname.tbname'},
+            self.extract_tables('SELECT * FROM clustername.schemaname.tbname'))
+
+        # Ill-defined cluster/schema/table.
         self.assertEquals(
             set(),
             self.extract_tables('SELECT * FROM schemaname.'))
 
+        self.assertEquals(
+            set(),
+            self.extract_tables('SELECT * FROM clustername.schemaname.'))
+
+        self.assertEquals(
+            set(),
+            self.extract_tables('SELECT * FROM clustername..'))
+
+        self.assertEquals(
+            set(),
+            self.extract_tables('SELECT * FROM clustername..tbname'))
+
         # quotes
         query = 'SELECT field1, field2 FROM tb_name'
         self.assertEquals({'tb_name'}, self.extract_tables(query))