httpserver: Rework Replacer loop to ignore escaped braces (#2075)

* httpserver.Replacer: Rework loop to ignore escaped placeholder braces

* Fix typo and ineffectual assignment to ret

* Remove redundant idxOffset declaration, simplify escape check

* Add benchmark tests for new Replacer code

caddyhttp/httpserver/replacer.go

@@ -141,6 +141,14 @@ func canLogRequest(r *http.Request) bool {
 	return false
 }
 
+// unescapeBraces finds escaped braces in s and returns
+// a string with those braces unescaped.
+func unescapeBraces(s string) string {
+	s = strings.Replace(s, "\\{", "{", -1)
+	s = strings.Replace(s, "\\}", "}", -1)
+	return s
+}
+
 // Replace performs a replacement of values on s and returns
 // the string with the replaced values.
 func (r *replacer) Replace(s string) string {
@@ -150,32 +158,59 @@ func (r *replacer) Replace(s string) string {
 	}
 
 	result := ""
+Placeholders: // process each placeholder in sequence
 	for {
-		idxStart := strings.Index(s, "{")
-		if idxStart == -1 {
-			// no placeholder anymore
-			break
-		}
-		idxEnd := strings.Index(s[idxStart:], "}")
-		if idxEnd == -1 {
-			// unpaired placeholder
-			break
-		}
-		idxEnd += idxStart
+		var idxStart, idxEnd int
 
-		// get a replacement
-		placeholder := s[idxStart : idxEnd+1]
+		idxOffset := 0
+		for { // find first unescaped opening brace
+			searchSpace := s[idxOffset:]
+			idxStart = strings.Index(searchSpace, "{")
+			if idxStart == -1 {
+				// no more placeholders
+				break Placeholders
+			}
+			if idxStart == 0 || searchSpace[idxStart-1] != '\\' {
+				// preceding character is not an escape
+				idxStart += idxOffset
+				break
+			}
+			// the brace we found was escaped
+			// search the rest of the string next
+			idxOffset += idxStart + 1
+		}
+
+		idxOffset = 0
+		for { // find first unescaped closing brace
+			searchSpace := s[idxStart+idxOffset:]
+			idxEnd = strings.Index(searchSpace, "}")
+			if idxEnd == -1 {
+				// unpaired placeholder
+				break Placeholders
+			}
+			if idxEnd == 0 || searchSpace[idxEnd-1] != '\\' {
+				// preceding character is not an escape
+				idxEnd += idxOffset + idxStart
+				break
+			}
+			// the brace we found was escaped
+			// search the rest of the string next
+			idxOffset += idxEnd + 1
+		}
+
+		// get a replacement for the unescaped placeholder
+		placeholder := unescapeBraces(s[idxStart : idxEnd+1])
 		replacement := r.getSubstitution(placeholder)
 
-		// append prefix + replacement
-		result += s[:idxStart] + replacement
+		// append unescaped prefix + replacement
+		result += strings.TrimPrefix(unescapeBraces(s[:idxStart]), "\\") + replacement
 
 		// strip out scanned parts
 		s = s[idxEnd+1:]
 	}
 
 	// append unscanned parts
-	return result + s
+	return result + unescapeBraces(s)
 }
 
 func roundDuration(d time.Duration) time.Duration {

caddyhttp/httpserver/replacer_test.go

@@ -112,6 +112,7 @@ func TestReplace(t *testing.T) {
 		{"Query string is {query}", "Query string is foo=bar"},
 		{"Query string value for foo is {?foo}", "Query string value for foo is bar"},
 		{"Missing query string argument is {?missing}", "Missing query string argument is "},
+		{"\\{ 'hostname': '{hostname}' \\}", "{ 'hostname': '" + hostname + "' }"},
 	}
 
 	for _, c := range testCases {
@@ -144,6 +145,70 @@ func TestReplace(t *testing.T) {
 	}
 }
 
+func BenchmarkReplace(b *testing.B) {
+	w := httptest.NewRecorder()
+	recordRequest := NewResponseRecorder(w)
+	reader := strings.NewReader(`{"username": "dennis"}`)
+
+	request, err := http.NewRequest("POST", "http://localhost/?foo=bar", reader)
+	if err != nil {
+		b.Fatalf("Failed to make request: %v", err)
+	}
+	ctx := context.WithValue(request.Context(), OriginalURLCtxKey, *request.URL)
+	request = request.WithContext(ctx)
+
+	request.Header.Set("Custom", "foobarbaz")
+	request.Header.Set("ShorterVal", "1")
+	repl := NewReplacer(request, recordRequest, "-")
+	// add some headers after creating replacer
+	request.Header.Set("CustomAdd", "caddy")
+	request.Header.Set("Cookie", "foo=bar; taste=delicious")
+
+	// add some respons headers
+	recordRequest.Header().Set("Custom", "CustomResponseHeader")
+
+	now = func() time.Time {
+		return time.Date(2006, 1, 2, 15, 4, 5, 02, time.FixedZone("hardcoded", -7))
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		repl.Replace("This hostname is {hostname}")
+	}
+}
+
+func BenchmarkReplaceEscaped(b *testing.B) {
+	w := httptest.NewRecorder()
+	recordRequest := NewResponseRecorder(w)
+	reader := strings.NewReader(`{"username": "dennis"}`)
+
+	request, err := http.NewRequest("POST", "http://localhost/?foo=bar", reader)
+	if err != nil {
+		b.Fatalf("Failed to make request: %v", err)
+	}
+	ctx := context.WithValue(request.Context(), OriginalURLCtxKey, *request.URL)
+	request = request.WithContext(ctx)
+
+	request.Header.Set("Custom", "foobarbaz")
+	request.Header.Set("ShorterVal", "1")
+	repl := NewReplacer(request, recordRequest, "-")
+	// add some headers after creating replacer
+	request.Header.Set("CustomAdd", "caddy")
+	request.Header.Set("Cookie", "foo=bar; taste=delicious")
+
+	// add some respons headers
+	recordRequest.Header().Set("Custom", "CustomResponseHeader")
+
+	now = func() time.Time {
+		return time.Date(2006, 1, 2, 15, 4, 5, 02, time.FixedZone("hardcoded", -7))
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		repl.Replace("\\{ 'hostname': '{hostname}' \\}")
+	}
+}
+
 func TestResponseRecorderNil(t *testing.T) {
 
 	reader := strings.NewReader(`{"username": "dennis"}`)