From b6f01da2326bfd440c5458b9255f33d15797a847 Mon Sep 17 00:00:00 2001
From: Dan Sosedoff <dan.sosedoff@gmail.com>
Date: Wed, 25 Sep 2019 20:29:21 -0500
Subject: [PATCH] Drop unsupported pg_dump options from connection string

---
 pkg/client/dump.go      | 38 ++++++++++++++++++++++++++++++++++++--
 pkg/client/dump_test.go | 10 ++++++++--
 2 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/pkg/client/dump.go b/pkg/client/dump.go
index 68a3aaa..4a232f8 100644
--- a/pkg/client/dump.go
+++ b/pkg/client/dump.go
@@ -4,19 +4,36 @@ import (
 	"bytes"
 	"fmt"
 	"io"
+	"net/url"
 	"os/exec"
+	"strings"
 )
 
+var (
+	unsupportedDumpOptions = []string{
+		"search_path",
+	}
+)
+
+// Dump represents a database dump
 type Dump struct {
 	Table string
 }
 
+// CanExport returns true if database dump tool could be used without an error
 func (d *Dump) CanExport() bool {
 	err := exec.Command("pg_dump", "--version").Run()
 	return err == nil
 }
 
-func (d *Dump) Export(url string, writer io.Writer) error {
+// Export streams the database dump to the specified writer
+func (d *Dump) Export(connstr string, writer io.Writer) error {
+	if str, err := removeUnsupportedOptions(connstr); err != nil {
+		return err
+	} else {
+		connstr = str
+	}
+
 	errOutput := bytes.NewBuffer(nil)
 
 	opts := []string{
@@ -29,7 +46,7 @@ func (d *Dump) Export(url string, writer io.Writer) error {
 		opts = append(opts, []string{"--table", d.Table}...)
 	}
 
-	opts = append(opts, url)
+	opts = append(opts, connstr)
 
 	cmd := exec.Command("pg_dump", opts...)
 	cmd.Stdout = writer
@@ -40,3 +57,20 @@ func (d *Dump) Export(url string, writer io.Writer) error {
 	}
 	return nil
 }
+
+// removeUnsupportedOptions removes any options unsupported for making a db dump
+func removeUnsupportedOptions(input string) (string, error) {
+	uri, err := url.Parse(input)
+	if err != nil {
+		return "", err
+	}
+
+	q := uri.Query()
+	for _, opt := range unsupportedDumpOptions {
+		q.Del(opt)
+		q.Del(strings.ToUpper(opt))
+	}
+	uri.RawQuery = q.Encode()
+
+	return uri.String(), nil
+}
diff --git a/pkg/client/dump_test.go b/pkg/client/dump_test.go
index 884bc35..413a068 100644
--- a/pkg/client/dump_test.go
+++ b/pkg/client/dump_test.go
@@ -34,8 +34,8 @@ func testDumpExport(t *testing.T) {
 	assert.NoError(t, err)
 
 	// Test nonexistent database
-	invalidUrl := fmt.Sprintf("postgres://%s@%s:%s/%s?sslmode=disable", serverUser, serverHost, serverPort, "foobar")
-	err = dump.Export(invalidUrl, saveFile)
+	invalidURL := fmt.Sprintf("postgres://%s@%s:%s/%s?sslmode=disable", serverUser, serverHost, serverPort, "foobar")
+	err = dump.Export(invalidURL, saveFile)
 	assert.Contains(t, err.Error(), `database "foobar" does not exist`)
 
 	// Test dump of non existent db
@@ -43,4 +43,10 @@ func testDumpExport(t *testing.T) {
 	err = dump.Export(url, saveFile)
 	assert.NotNil(t, err)
 	assert.Contains(t, err.Error(), "pg_dump: no matching tables were found")
+
+	// Should drop "search_path" param from URI
+	dump = Dump{}
+	searchPathURL := fmt.Sprintf("postgres://%s@%s:%s/%s?sslmode=disable&search_path=private", serverUser, serverHost, serverPort, serverDatabase)
+	err = dump.Export(searchPathURL, saveFile)
+	assert.NoError(t, err)
 }