Merge pull request #346 from CartoDB/username

Add CDB_Username function

Makefile

@@ -1,7 +1,7 @@
 # cartodb/Makefile
 
 EXTENSION = cartodb
-EXTVERSION = 0.24.1
+EXTVERSION = 0.25.0
 
 SED = sed
 AWK = awk
@@ -93,6 +93,7 @@ UPGRADABLE = \
   0.23.2 \
   0.24.0 \
   0.24.1 \
+  0.25.0 \
   $(EXTVERSION)dev \
   $(EXTVERSION)next \
   $(END)

NEWS.md

@@ -1,3 +1,6 @@
+0.25.0 (2019-02-22)
+* Add `CDB_Username` to get the cartodb username from the current PostgreSQL user
+
 0.24.1 (2019-01-02)
 * Drop functions removed in 0.12 (#341)
 * Travis: Test with PostgreSQL 9.5, 10 and 11.

scripts-available/CDB_Username.sql

@@ -0,0 +1,6 @@
+-- Returns the cartodb username of the current PostgreSQL session
+CREATE OR REPLACE FUNCTION CDB_Username()
+RETURNS text
+AS $$
+  SELECT CDB_Conf_GetConf(CONCAT('api_keys_', session_user))->>'username';
+$$ LANGUAGE SQL STABLE PARALLEL SAFE SECURITY DEFINER;

scripts-enabled/920-CDB_Username.sql

@@ -0,0 +1 @@
+../scripts-available/CDB_Username.sql

test/CDB_Username.sql

@@ -0,0 +1,22 @@
+SELECT session_user; -- postgres
+SELECT CDB_Username(); -- (NULL)
+
+-- Add the role fulano with api_key and connect with it
+\set QUIET on
+CREATE ROLE fulano LOGIN;
+GRANT USAGE ON SCHEMA cartodb TO fulano;
+GRANT EXECUTE ON FUNCTION CDB_Username() TO fulano;
+INSERT INTO cdb_conf (key, value) VALUES ('api_keys_fulano', '{"username": "fulanito", "permissions":[]}');
+SET SESSION AUTHORIZATION fulano;
+\set QUIET off
+
+SELECT session_user; -- fulano
+SELECT CDB_Username(); -- fulanito
+
+-- Remove fulano
+\set QUIET on
+SET SESSION AUTHORIZATION postgres;
+REVOKE USAGE ON SCHEMA cartodb FROM fulano;
+REVOKE EXECUTE ON FUNCTION CDB_Username() FROM fulano;
+DROP ROLE fulano;
+\set QUIET off

test/CDB_Username_expect

@@ -0,0 +1,4 @@
+postgres
+
+fulano
+fulanito