Escape SQL username and password parameters before substituting them into a URL

sdk/database/helper/connutil/sql.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+	"net/url"
 	"strings"
 	"sync"
 	"time"
@@ -54,9 +55,11 @@ func (c *SQLConnectionProducer) Init(ctx context.Context, conf map[string]interf
 		return nil, fmt.Errorf("connection_url cannot be empty")
 	}
 
+	// QueryHelper doesn't do any SQL escaping, but if it starts to do so
+	// then maybe we won't be able to use it to do URL substitution any more.
 	c.ConnectionURL = dbutil.QueryHelper(c.ConnectionURL, map[string]string{
-		"username": c.Username,
-		"password": c.Password,
+		"username": url.PathEscape(c.Username),
+		"password": url.PathEscape(c.Password),
 	})
 
 	if c.MaxOpenConnections == 0 {

sdk/database/helper/connutil/sql_test.go

@@ -0,0 +1,56 @@
+package connutil
+
+import (
+	"context"
+	"net/url"
+	"testing"
+)
+
+func TestSQLPasswordChars(t *testing.T) {
+	testCases := []struct {
+		Username string
+		Password string
+	}{
+		{"postgres", "password{0}"},
+		{"postgres", "pass:word"},
+		{"postgres", "pass/word"},
+		{"postgres", "p@ssword"},
+		{"postgres", "pass\"word\""},
+		// Much to my surprise, CREATE USER "{{password}}" PASSWORD 'foo' worked.
+		{"{{password}}", "foo"},
+		{"user", "{{username}}"},
+	}
+	for _, tc := range testCases {
+		t.Logf("username %q password %q", tc.Username, tc.Password)
+
+		sql := &SQLConnectionProducer{}
+		ctx := context.Background()
+		conf := map[string]interface{}{
+			"connection_url": "postgres://{{username}}:{{password}}@localhost:5432/mydb",
+			"username":       tc.Username,
+			"password":       tc.Password,
+		}
+		_, err := sql.Init(ctx, conf, false)
+		if err != nil {
+			t.Errorf("Init error on %q %q: %+v", tc.Username, tc.Password, err)
+		} else {
+			// This jumps down a few layers...
+			// Connection() uses sql.Open uses lib/pq uses net/url.Parse
+			u, err := url.Parse(sql.ConnectionURL)
+			if err != nil {
+				t.Errorf("URL parse error on %q %q: %+v", tc.Username, tc.Password, err)
+			} else {
+				username := u.User.Username()
+				password, pPresent := u.User.Password()
+				if username != tc.Username {
+					t.Errorf("Parsed username %q != original username %q", username, tc.Username)
+				}
+				if !pPresent {
+					t.Errorf("Password %q not present", tc.Password)
+				} else if password != tc.Password {
+					t.Errorf("Parsed password %q != original password %q", password, tc.Password)
+				}
+			}
+		}
+	}
+}