En/add support for encoded forms (#1073)

docs/references/context/page.md

@@ -51,9 +51,9 @@ parts of the request.
   // the Bind() method will map the incoming request to variable p
   ```
 
-- `Binding multipart-form data` 
-  - To bind multipart-form data, you can use the Bind method similarly. The struct fields should be tagged appropriately 
-    to map the form fields to the struct fields.
+- `Binding multipart-form data / urlencoded form data ` 
+  - To bind multipart-form data or url-encoded form, you can use the Bind method similarly. The struct fields should be tagged appropriately 
+    to map the form fields to the struct fields. The supported content types are `multipart/form-data` and `application/x-www-form-urlencoded`
 
     ```go
     type Data struct {

pkg/gofr/http/multipart_file_bind.go

@@ -29,6 +29,16 @@ type formData struct {
 func (uf *formData) mapStruct(val reflect.Value, field *reflect.StructField) (bool, error) {
 	vKind := val.Kind()
 
+	if field == nil {
+		// Check if val is not a struct
+		if vKind != reflect.Struct {
+			return false, nil // Return false if val is not a struct
+		}
+
+		// If field is nil, iterate through all fields of the struct
+		return uf.iterateStructFields(val)
+	}
+
 	if vKind == reflect.Pointer {
 		return uf.checkPointer(val, field)
 	}
@@ -79,6 +89,10 @@ func (uf *formData) checkPointer(val reflect.Value, field *reflect.StructField)
 }
 
 func (uf *formData) checkStruct(val reflect.Value) (bool, error) {
+	return uf.iterateStructFields(val)
+}
+
+func (uf *formData) iterateStructFields(val reflect.Value) (bool, error) {
 	var set bool
 
 	tVal := val.Type()

pkg/gofr/http/request.go

@@ -68,6 +68,8 @@ func (r *Request) Bind(i interface{}) error {
 		return json.Unmarshal(body, &i)
 	case "multipart/form-data":
 		return r.bindMultipart(i)
+	case "application/x-www-form-urlencoded":
+		return r.bindFormURLEncoded(i)
 	}
 
 	return nil
@@ -109,26 +111,48 @@ func (r *Request) body() ([]byte, error) {
 }
 
 func (r *Request) bindMultipart(ptr any) error {
+	return r.bindForm(ptr, true)
+}
+
+func (r *Request) bindFormURLEncoded(ptr any) error {
+	return r.bindForm(ptr, false)
+}
+
+func (r *Request) bindForm(ptr any, isMultipart bool) error {
 	ptrVal := reflect.ValueOf(ptr)
 	if ptrVal.Kind() != reflect.Ptr {
 		return errNonPointerBind
 	}
 
 	ptrVal = ptrVal.Elem()
 
-	if err := r.req.ParseMultipartForm(defaultMaxMemory); err != nil {
-		return err
-	}
+	var fd formData
 
-	fd := formData{files: r.req.MultipartForm.File, fields: r.req.MultipartForm.Value}
+	if isMultipart {
+		if err := r.req.ParseMultipartForm(defaultMaxMemory); err != nil {
+			return err
+		}
 
-	ok, err := fd.mapStruct(ptrVal, &reflect.StructField{})
+		fd = formData{files: r.req.MultipartForm.File, fields: r.req.MultipartForm.Value}
+	} else {
+		if err := r.req.ParseForm(); err != nil {
+			return err
+		}
+
+		fd = formData{fields: r.req.Form}
+	}
+
+	ok, err := fd.mapStruct(ptrVal, nil)
 	if err != nil {
 		return err
 	}
 
 	if !ok {
-		return errNoFileFound
+		if isMultipart {
+			return errNoFileFound
+		}
+
+		return errFieldsNotSet
 	}
 
 	return nil

pkg/gofr/http/request_test.go

@@ -251,3 +251,24 @@ func Test_Params(t *testing.T) {
 	assert.ElementsMatch(t, expectedTags, r.Params("tag"), "expected all values of 'tag' to match")
 	assert.Empty(t, r.Params("nonexistent"), "expected empty slice for non-existent query param")
 }
+
+func TestBind_FormURLEncoded(t *testing.T) {
+	// Create a new HTTP request with form-encoded data
+	req := NewRequest(httptest.NewRequest(http.MethodPost, "/abc", strings.NewReader("Name=John&Age=30")))
+	req.req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+
+	x := struct {
+		Name string `form:"Name"`
+		Age  int    `form:"Age"`
+	}{}
+
+	err := req.Bind(&x)
+	if err != nil {
+		t.Errorf("Bind error: %v", err)
+	}
+
+	// Check the results
+	if x.Name != "John" || x.Age != 30 {
+		t.Errorf("Bind error. Got: %v", x)
+	}
+}