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net/url: add PathEscape, PathUnescape
Fixes #13737. Change-Id: Ib655dbf06f44709f687f8a2410c80f31e4075f13 Reviewed-on: https://go-review.googlesource.com/31322 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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@ -74,6 +74,7 @@ type encoding int
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const (
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const (
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encodePath encoding = 1 + iota
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encodePath encoding = 1 + iota
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encodePathSegment
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encodeHost
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encodeHost
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encodeZone
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encodeZone
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encodeUserPassword
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encodeUserPassword
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@ -132,9 +133,14 @@ func shouldEscape(c byte, mode encoding) bool {
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// The RFC allows : @ & = + $ but saves / ; , for assigning
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// The RFC allows : @ & = + $ but saves / ; , for assigning
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// meaning to individual path segments. This package
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// meaning to individual path segments. This package
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// only manipulates the path as a whole, so we allow those
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// only manipulates the path as a whole, so we allow those
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// last two as well. That leaves only ? to escape.
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// last three as well. That leaves only ? to escape.
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return c == '?'
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return c == '?'
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case encodePathSegment: // §3.3
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// The RFC allows : @ & = + $ but saves / ; , for assigning
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// meaning to individual path segments.
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return c == '/' || c == ';' || c == ',' || c == '?'
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case encodeUserPassword: // §3.2.1
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case encodeUserPassword: // §3.2.1
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// The RFC allows ';', ':', '&', '=', '+', '$', and ',' in
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// The RFC allows ';', ':', '&', '=', '+', '$', and ',' in
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// userinfo, so we must escape only '@', '/', and '?'.
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// userinfo, so we must escape only '@', '/', and '?'.
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@ -164,6 +170,15 @@ func QueryUnescape(s string) (string, error) {
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return unescape(s, encodeQueryComponent)
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return unescape(s, encodeQueryComponent)
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}
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}
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// PathUnescape does the inverse transformation of PathEscape, converting
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// %AB into the byte 0xAB. It returns an error if any % is not followed by
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// two hexadecimal digits.
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//
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// PathUnescape is identical to QueryUnescape except that it does not unescape '+' to ' ' (space).
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func PathUnescape(s string) (string, error) {
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return unescape(s, encodePathSegment)
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}
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// unescape unescapes a string; the mode specifies
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// unescape unescapes a string; the mode specifies
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// which section of the URL string is being unescaped.
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// which section of the URL string is being unescaped.
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func unescape(s string, mode encoding) (string, error) {
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func unescape(s string, mode encoding) (string, error) {
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@ -250,6 +265,12 @@ func QueryEscape(s string) string {
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return escape(s, encodeQueryComponent)
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return escape(s, encodeQueryComponent)
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}
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}
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// PathEscape escapes the string so it can be safely placed
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// inside a URL path segment.
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func PathEscape(s string) string {
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return escape(s, encodePathSegment)
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}
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func escape(s string, mode encoding) string {
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func escape(s string, mode encoding) string {
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spaceCount, hexCount := 0, 0
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spaceCount, hexCount := 0, 0
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for i := 0; i < len(s); i++ {
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for i := 0; i < len(s); i++ {
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@ -800,6 +800,16 @@ var unescapeTests = []EscapeTest{
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"",
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"",
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EscapeError("%zz"),
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EscapeError("%zz"),
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},
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},
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{
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"a+b",
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"a b",
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nil,
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},
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{
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"a%20b",
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"a b",
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nil,
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},
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}
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}
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func TestUnescape(t *testing.T) {
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func TestUnescape(t *testing.T) {
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@ -808,10 +818,33 @@ func TestUnescape(t *testing.T) {
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if actual != tt.out || (err != nil) != (tt.err != nil) {
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if actual != tt.out || (err != nil) != (tt.err != nil) {
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t.Errorf("QueryUnescape(%q) = %q, %s; want %q, %s", tt.in, actual, err, tt.out, tt.err)
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t.Errorf("QueryUnescape(%q) = %q, %s; want %q, %s", tt.in, actual, err, tt.out, tt.err)
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}
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}
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in := tt.in
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out := tt.out
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if strings.Contains(tt.in, "+") {
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in = strings.Replace(tt.in, "+", "%20", -1)
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actual, err := PathUnescape(in)
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if actual != tt.out || (err != nil) != (tt.err != nil) {
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t.Errorf("PathUnescape(%q) = %q, %s; want %q, %s", in, actual, err, tt.out, tt.err)
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}
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if tt.err == nil {
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s, err := QueryUnescape(strings.Replace(tt.in, "+", "XXX", -1))
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if err != nil {
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continue
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}
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in = tt.in
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out = strings.Replace(s, "XXX", "+", -1)
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}
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}
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actual, err = PathUnescape(in)
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if actual != out || (err != nil) != (tt.err != nil) {
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t.Errorf("PathUnescape(%q) = %q, %s; want %q, %s", in, actual, err, out, tt.err)
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}
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}
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}
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}
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}
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var escapeTests = []EscapeTest{
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var queryEscapeTests = []EscapeTest{
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{
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{
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"",
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"",
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"",
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"",
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@ -839,8 +872,8 @@ var escapeTests = []EscapeTest{
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},
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},
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}
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}
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func TestEscape(t *testing.T) {
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func TestQueryEscape(t *testing.T) {
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for _, tt := range escapeTests {
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for _, tt := range queryEscapeTests {
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actual := QueryEscape(tt.in)
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actual := QueryEscape(tt.in)
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if tt.out != actual {
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if tt.out != actual {
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t.Errorf("QueryEscape(%q) = %q, want %q", tt.in, actual, tt.out)
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t.Errorf("QueryEscape(%q) = %q, want %q", tt.in, actual, tt.out)
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@ -854,6 +887,54 @@ func TestEscape(t *testing.T) {
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}
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}
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}
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}
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var pathEscapeTests = []EscapeTest{
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{
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"",
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"",
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nil,
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},
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{
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"abc",
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"abc",
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nil,
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},
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{
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"abc+def",
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"abc+def",
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nil,
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},
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{
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"one two",
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"one%20two",
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nil,
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},
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{
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"10%",
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"10%25",
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nil,
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},
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{
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" ?&=#+%!<>#\"{}|\\^[]`☺\t:/@$'()*,;",
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"%20%3F&=%23+%25%21%3C%3E%23%22%7B%7D%7C%5C%5E%5B%5D%60%E2%98%BA%09:%2F@$%27%28%29%2A%2C%3B",
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nil,
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},
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}
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func TestPathEscape(t *testing.T) {
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for _, tt := range pathEscapeTests {
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actual := PathEscape(tt.in)
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if tt.out != actual {
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t.Errorf("PathEscape(%q) = %q, want %q", tt.in, actual, tt.out)
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}
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// for bonus points, verify that escape:unescape is an identity.
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roundtrip, err := PathUnescape(actual)
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if roundtrip != tt.in || err != nil {
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t.Errorf("PathUnescape(%q) = %q, %s; want %q, %s", actual, roundtrip, err, tt.in, "[no error]")
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}
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}
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}
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//var userinfoTests = []UserinfoTest{
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//var userinfoTests = []UserinfoTest{
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// {"user", "password", "user:password"},
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// {"user", "password", "user:password"},
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// {"foo:bar", "~!@#$%^&*()_+{}|[]\\-=`:;'\"<>?,./",
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// {"foo:bar", "~!@#$%^&*()_+{}|[]\\-=`:;'\"<>?,./",
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