QueryUnescape DSN ConnectionAttribute value (#1470)

Author: zhangyangyu

Diff for: AUTHORS

@@ -109,6 +109,7 @@ Xiangyu Hu <xiangyu.hu at outlook.com>
 Xiaobing Jiang <s7v7nislands at gmail.com>
 Xiuming Chen <cc at cxm.cc>
 Xuehong Chan <chanxuehong at gmail.com>
+Zhang Xiang <angwerzx at 126.com>
 Zhenye Xie <xiezhenye at gmail.com>
 Zhixin Wen <john.wenzhixin at gmail.com>
 Ziheng Lyu <zihenglv at gmail.com>
@@ -127,6 +128,7 @@ InfoSum Ltd.
 Keybase Inc.
 Multiplay Ltd.
 Percona LLC
+PingCAP Inc.
 Pivotal Inc.
 Stripe Inc.
 Zendesk Inc.

Diff for: driver_test.go

@@ -3379,9 +3379,10 @@ func TestConnectionAttributes(t *testing.T) {
 
 	attr1 := "attr1"
 	value1 := "value1"
-	attr2 := "foo"
-	value2 := "boo"
-	dsn += fmt.Sprintf("&connectionAttributes=%s:%s,%s:%s", attr1, value1, attr2, value2)
+	attr2 := "fo/o"
+	value2 := "bo/o"
+	dsn += "&connectionAttributes=" + url.QueryEscape(fmt.Sprintf("%s:%s,%s:%s", attr1, value1, attr2, value2))
+
 
 	var db *sql.DB
 	if _, err := ParseDSN(dsn); err != errInvalidDSNUnsafeCollation {
@@ -3407,6 +3408,17 @@ func TestConnectionAttributes(t *testing.T) {
 	}
 	rows.Close()
 
+	rows = dbt.mustQuery(queryString, attr1)
+	if rows.Next() {
+		rows.Scan(&attrValue)
+		if attrValue != value1 {
+			dbt.Errorf("expected %q, got %q", value1, attrValue)
+		}
+	} else {
+		dbt.Errorf("no data")
+	}
+	rows.Close()
+
 	rows = dbt.mustQuery(queryString, attr2)
 	if rows.Next() {
 		rows.Scan(&attrValue)

Diff for: dsn.go

@@ -569,7 +569,11 @@ func parseDSNParams(cfg *Config, params string) (err error) {
 
 		// Connection attributes
 		case "connectionAttributes":
-			cfg.ConnectionAttributes = value
+			connectionAttributes, err := url.QueryUnescape(value)
+			if err != nil {
+				return fmt.Errorf("invalid connectionAttributes value: %v", err)
+			}
+			cfg.ConnectionAttributes = connectionAttributes
 
 		default:
 			// lazy init