feature: write query bool parser for query parameters.

context.go

@@ -15,6 +15,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -486,6 +487,61 @@ func (c *Context) GetQueryMap(key string) (map[string]string, bool) {
 	return c.get(c.queryCache, key)
 }
 
+// QueryBool returns a value of boolean type for given query key.
+// HINT: if given key is not exist or not valid, it returns false.
+//
+//	GET /?name=alex&force=true&delivery=
+//	c.QueryBool("force") == true
+//	c.QueryBool("name") == false
+//	c.QueryBool("delivery") == false
+func (c *Context) QueryBool(key string) bool {
+
+	value, _ := c.GetQuery(key)
+	boolValue, _ := strconv.ParseBool(value)
+
+	return boolValue
+}
+
+// GetQueryBoolDefault returns the keyed boolean url query value if it exists and valid,
+// otherwise it returns the specified defaultValue string.
+//
+//	GET /?name=alex&force=true&delivery=
+//	c.GetQueryBoolDefault("force", false) == true
+//	c.GetQueryBoolDefault("name", false) == false
+//	c.GetQueryBoolDefault("delivery", false) == false
+func (c *Context) GetQueryBoolDefault(key string, defaultValue bool) bool {
+
+	if value, ok := c.GetQuery(key); ok {
+		boolValue, err := strconv.ParseBool(value)
+		if err != nil {
+			return defaultValue
+		}
+		return boolValue
+	}
+
+	return defaultValue
+}
+
+// GetQueryBool is like QueryBool(), it returns the keyed url query value but in boolean,
+// if key exists and valid it returns (value, true)
+// but if key is not exist or not valid, it returns (false, false)
+//
+//	GET /?name=alex&force=false&delivery=
+//	GetQueryBool("force") == false, true
+//	GetQueryBool("name") == false, false
+//	GetQueryBool("delivery") == false, false
+func (c *Context) GetQueryBool(key string) (bool, bool) {
+	if value, ok := c.GetQuery(key); ok {
+		boolValue, err := strconv.ParseBool(value)
+		if err != nil {
+			return false, false
+		}
+		return boolValue, true
+	}
+
+	return false, false
+}
+
 // PostForm returns the specified key from a POST urlencoded form or multipart form
 // when it exists, otherwise it returns an empty string `("")`.
 func (c *Context) PostForm(key string) (value string) {

context_test.go

@@ -373,7 +373,7 @@ func TestContextHandler(t *testing.T) {
 
 func TestContextQuery(t *testing.T) {
 	c, _ := CreateTestContext(httptest.NewRecorder())
-	c.Request, _ = http.NewRequest("GET", "http://example.com/?foo=bar&page=10&id=", nil)
+	c.Request, _ = http.NewRequest("GET", "http://example.com/?foo=bar&page=10&read=true&id=", nil)
 
 	value, ok := c.GetQuery("foo")
 	assert.True(t, ok)
@@ -404,6 +404,35 @@ func TestContextQuery(t *testing.T) {
 	assert.False(t, ok)
 	assert.Empty(t, value)
 	assert.Empty(t, c.PostForm("foo"))
+
+	valueBool := c.QueryBool("read")
+	assert.True(t, valueBool)
+	assert.Equal(t, true, valueBool)
+
+	valueBool = c.QueryBool("id")
+	assert.False(t, valueBool)
+	assert.Equal(t, false, valueBool)
+
+	valueBool, ok = c.GetQueryBool("read")
+	assert.True(t, ok)
+	assert.True(t, valueBool)
+	assert.Equal(t, true, valueBool)
+	assert.Equal(t, true, ok)
+
+	valueBool, ok = c.GetQueryBool("id")
+	assert.False(t, ok)
+	assert.False(t, valueBool)
+	assert.Equal(t, valueBool, false)
+	assert.Equal(t, ok, false)
+
+	valueBool = c.GetQueryBoolDefault("read", false)
+	assert.True(t, valueBool)
+	assert.Equal(t, true, valueBool)
+
+	valueBool = c.GetQueryBoolDefault("id", true)
+	assert.True(t, valueBool)
+	assert.Equal(t, true, valueBool)
+
 }
 
 func TestContextDefaultQueryOnEmptyRequest(t *testing.T) {

docs/doc.md

@@ -169,12 +169,13 @@ func main() {
   router := gin.Default()
 
   // Query string parameters are parsed using the existing underlying request object.
-  // The request responds to an url matching:  /welcome?firstname=Jane&lastname=Doe
+  // The request responds to an url matching:  /welcome?firstname=Jane&lastname=Doe&want_pizza=true
   router.GET("/welcome", func(c *gin.Context) {
     firstname := c.DefaultQuery("firstname", "Guest")
     lastname := c.Query("lastname") // shortcut for c.Request.URL.Query().Get("lastname")
+	wantPizza := c.QueryBool("want_pizza")
 
-    c.String(http.StatusOK, "Hello %s %s", firstname, lastname)
+    c.String(http.StatusOK, "%s %s want a pizza? %v", firstname, lastname, wantPizza)
   })
   router.Run(":8080")
 }