logger: allow skipping query string output

docs/doc.md

@@ -22,6 +22,7 @@
   - [How to write log file](#how-to-write-log-file)
   - [Custom Log Format](#custom-log-format)
   - [Controlling Log output coloring](#controlling-log-output-coloring)
+  - [Avoid logging query strings](#avoid-loging-query-strings)
   - [Model binding and validation](#model-binding-and-validation)
   - [Custom Validators](#custom-validators)
   - [Only Bind Query String](#only-bind-query-string)
@@ -589,6 +590,20 @@ func main() {
 }
 ```
 
+### Avoid logging query strings
+
+```go
+func main() {
+  router := gin.New()
+
+  // SkipQueryString indicates that the logger should not log the query string.
+  // For example, /path?q=1 will be logged as /path
+  loggerConfig := gin.LoggerConfig{SkipQueryString: true}
+
+  router.Use(gin.LoggerWithConfig(loggerConfig))
+}
+```
+
 ### Model binding and validation
 
 To bind a request body into a type, use model binding. We currently support binding of JSON, XML, YAML, TOML and standard form values (foo=bar&boo=baz).

logger.go

@@ -44,6 +44,11 @@ type LoggerConfig struct {
 	// Optional. Default value is gin.DefaultWriter.
 	Output io.Writer
 
+	// SkipQueryString indicates that query strings should not be written
+	// for cases such as when API keys are passed via query strings.
+	// Optional. Default value is false.
+	SkipQueryString bool
+
 	// SkipPaths is an url path array which logs are not written.
 	// Optional.
 	SkipPaths []string
@@ -270,7 +275,7 @@ func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
 
 		param.BodySize = c.Writer.Size()
 
-		if raw != "" {
+		if raw != "" && !conf.SkipQueryString {
 			path = path + "?" + raw
 		}
 

logger_test.go

@@ -454,3 +454,17 @@ func TestForceConsoleColor(t *testing.T) {
 	// reset console color mode.
 	consoleColorMode = autoColor
 }
+
+func TestLoggerWithConfigSkipQueryString(t *testing.T) {
+	buffer := new(strings.Builder)
+	router := New()
+	router.Use(LoggerWithConfig(LoggerConfig{
+		Output:          buffer,
+		SkipQueryString: true,
+	}))
+	router.GET("/logged", func(c *Context) { c.Status(http.StatusOK) })
+
+	PerformRequest(router, "GET", "/logged?a=21")
+	assert.Contains(t, buffer.String(), "200")
+	assert.NotContains(t, buffer.String(), "a=21")
+}