replaced the default binder with rest.MultiBinder

apis/base.go

@@ -28,6 +28,7 @@ const trailedAdminPath = "/_/"
 func InitApi(app core.App) (*echo.Echo, error) {
 	e := echo.New()
 	e.Debug = false
+	e.Binder = &rest.MultiBinder{}
 	e.JSONSerializer = &rest.Serializer{
 		FieldsParam: fieldsQueryParam,
 	}

apis/base_test.go

@@ -11,6 +11,7 @@ import (
 	"github.com/labstack/echo/v5"
 	"github.com/pocketbase/pocketbase/apis"
 	"github.com/pocketbase/pocketbase/tests"
+	"github.com/pocketbase/pocketbase/tools/rest"
 	"github.com/spf13/cast"
 )
 
@@ -220,15 +221,24 @@ func TestRemoveTrailingSlashMiddleware(t *testing.T) {
 	}
 }
 
-func TestEagerRequestInfoCache(t *testing.T) {
+func TestMultiBinder(t *testing.T) {
 	t.Parallel()
 
+	rawJson := `{"name":"test123"}`
+
+	formData, mp, err := tests.MockMultipartData(map[string]string{
+		rest.MultipartJsonKey: rawJson,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	scenarios := []tests.ApiScenario{
 		{
-			Name:   "custom non-api group route",
+			Name:   "non-api group route",
 			Method: "POST",
 			Url:    "/custom",
-			Body:   strings.NewReader(`{"name":"test123"}`),
+			Body:   strings.NewReader(rawJson),
 			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
 				e.AddRoute(echo.Route{
 					Method: "POST",
@@ -242,11 +252,10 @@ func TestEagerRequestInfoCache(t *testing.T) {
 							return err
 						}
 
-						// since the unknown method is not eager cache support
+						// try to read the body again
-						// it should fail reading the json body twice
 						r := apis.RequestInfo(c)
-						if v := cast.ToString(r.Data["name"]); v != "" {
+						if v := cast.ToString(r.Data["name"]); v != "test123" {
-							t.Fatalf("Expected empty request data body, got, %v", r.Data)
+							t.Fatalf("Expected request data with name %q, got, %q", "test123", v)
 						}
 
 						return c.NoContent(200)
@@ -256,41 +265,10 @@ func TestEagerRequestInfoCache(t *testing.T) {
 			ExpectedStatus: 200,
 		},
 		{
-			Name:   "api group route with unsupported eager cache request method",
+			Name:   "api group route",
 			Method: "GET",
 			Url:    "/api/admins",
-			Body:   strings.NewReader(`{"name":"test123"}`),
+			Body:   strings.NewReader(rawJson),
-			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
-				e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
-					return func(c echo.Context) error {
-						// it is not important whether the route handler return an error since
-						// we just need to ensure that the eagerRequestInfoCache was registered
-						next(c)
-
-						// ensure that the body was read at least once
-						data := &struct {
-							Name string `json:"name"`
-						}{}
-						c.Bind(data)
-
-						// since the unknown method is not eager cache support
-						// it should fail reading the json body twice
-						r := apis.RequestInfo(c)
-						if v := cast.ToString(r.Data["name"]); v != "" {
-							t.Fatalf("Expected empty request data body, got, %v", r.Data)
-						}
-
-						return nil
-					}
-				})
-			},
-			ExpectedStatus: 200,
-		},
-		{
-			Name:   "api group route with supported eager cache request method",
-			Method: "POST",
-			Url:    "/api/admins",
-			Body:   strings.NewReader(`{"name":"test123"}`),
 			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
 				e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
 					return func(c echo.Context) error {
@@ -316,6 +294,39 @@ func TestEagerRequestInfoCache(t *testing.T) {
 			},
 			ExpectedStatus: 200,
 		},
+		{
+			Name:   "custom route with @jsonPayload as multipart body",
+			Method: "POST",
+			Url:    "/custom",
+			Body:   formData,
+			RequestHeaders: map[string]string{
+				"Content-Type": mp.FormDataContentType(),
+			},
+			BeforeTestFunc: func(t *testing.T, app *tests.TestApp, e *echo.Echo) {
+				e.AddRoute(echo.Route{
+					Method: "POST",
+					Path:   "/custom",
+					Handler: func(c echo.Context) error {
+						data := &struct {
+							Name string `json:"name"`
+						}{}
+
+						if err := c.Bind(data); err != nil {
+							return err
+						}
+
+						// try to read the body again
+						r := apis.RequestInfo(c)
+						if v := cast.ToString(r.Data["name"]); v != "test123" {
+							t.Fatalf("Expected request data with name %q, got, %q", "test123", v)
+						}
+
+						return c.NoContent(200)
+					},
+				})
+			},
+			ExpectedStatus: 200,
+		},
 	}
 
 	for _, scenario := range scenarios {

apis/middlewares.go

@@ -402,6 +402,8 @@ func realUserIp(r *http.Request, fallbackIp string) string {
 	return fallbackIp
 }
 
+// @todo consider removing as this may no longer be needed due to the custom rest.MultiBinder.
+//
 // eagerRequestInfoCache ensures that the request data is cached in the request
 // context to allow reading for example the json request body data more than once.
 func eagerRequestInfoCache(app core.App) echo.MiddlewareFunc {

tools/rest/json_serializer.go

@@ -68,8 +68,8 @@ func (s *Serializer) Serialize(c echo.Context, i any, indent string) error {
 //
 // Example:
 //
-// 	data := map[string]any{"a": 1, "b": 2, "c": map[string]any{"c1": 11, "c2": 22}}
+//	data := map[string]any{"a": 1, "b": 2, "c": map[string]any{"c1": 11, "c2": 22}}
-// 	PickFields(data, "a,c.c1") // map[string]any{"a": 1, "c": map[string]any{"c1": 11}}
+//	PickFields(data, "a,c.c1") // map[string]any{"a": 1, "c": map[string]any{"c1": 11}}
 func PickFields(data any, rawFields string) (any, error) {
 	parsedFields, err := parseFields(rawFields)
 	if err != nil {

tools/rest/multi_binder.go

@@ -13,9 +13,35 @@ import (
 )
 
 // MultipartJsonKey is the key for the special multipart/form-data
-// handling allowing reading serialized json payload without normalizations
+// handling allowing reading serialized json payload without normalization.
 const MultipartJsonKey string = "@jsonPayload"
 
+// MultiBinder is similar to [echo.DefaultBinder] but uses slightly different
+// application/json and multipart/form-data bind methods to accommodate better
+// the PocketBase router needs.
+type MultiBinder struct{}
+
+// Bind implements the [Binder.Bind] method.
+//
+// Bind is almost identical to [echo.DefaultBinder.Bind] but uses the
+// [rest.BindBody] function for binding the request body.
+func (b *MultiBinder) Bind(c echo.Context, i interface{}) (err error) {
+	if err := echo.BindPathParams(c, i); err != nil {
+		return err
+	}
+
+	// Only bind query parameters for GET/DELETE/HEAD to avoid unexpected behavior with destination struct binding from body.
+	// For example a request URL `&id=1&lang=en` with body `{"id":100,"lang":"de"}` would lead to precedence issues.
+	method := c.Request().Method
+	if method == http.MethodGet || method == http.MethodDelete || method == http.MethodHead {
+		if err = echo.BindQueryParams(c, i); err != nil {
+			return err
+		}
+	}
+
+	return BindBody(c, i)
+}
+
 // BindBody binds request body content to i.
 //
 // This is similar to `echo.BindBody()`, but for JSON requests uses
@@ -47,8 +73,8 @@ func BindBody(c echo.Context, i any) error {
 func CopyJsonBody(r *http.Request, i any) error {
 	body := r.Body
 
-	// this usually shouldn't be needed because the Server calls close for us
+	// this usually shouldn't be needed because the Server calls close
-	// but we are changing the request body with a new reader
+	// for us but we are changing the request body with a new reader
 	defer body.Close()
 
 	limitReader := io.LimitReader(body, DefaultMaxMemory)
@@ -82,7 +108,7 @@ func bindFormData(c echo.Context, i any) error {
 		return nil
 	}
 
-	// special case to allow submitting json without normalizations
+	// special case to allow submitting json without normalization
 	// alongside the other multipart/form-data values
 	jsonPayloadValues := values[MultipartJsonKey]
 	for _, payload := range jsonPayloadValues {

tools/rest/multi_binder_test.go

@@ -13,6 +13,46 @@ import (
 	"github.com/pocketbase/pocketbase/tools/rest"
 )
 
+func TestMultiBinderBind(t *testing.T) {
+	binder := rest.MultiBinder{}
+
+	req := httptest.NewRequest(http.MethodGet, "/test?query=123", strings.NewReader(`{"body":"456"}`))
+	req.Header.Set(echo.HeaderContentType, echo.MIMEApplicationJSON)
+
+	rec := httptest.NewRecorder()
+
+	e := echo.New()
+	e.Any("/:name", func(c echo.Context) error {
+		// bind twice to ensure that the json body reader copy is invoked
+		for i := 0; i < 2; i++ {
+			data := struct {
+				Name  string `param:"name"`
+				Query string `query:"query"`
+				Body  string `form:"body"`
+			}{}
+
+			if err := binder.Bind(c, &data); err != nil {
+				t.Fatal(err)
+			}
+
+			if data.Name != "test" {
+				t.Fatalf("Expected Name %q, got %q", "test", data.Name)
+			}
+
+			if data.Query != "123" {
+				t.Fatalf("Expected Query %q, got %q", "123", data.Query)
+			}
+
+			if data.Body != "456" {
+				t.Fatalf("Expected Body %q, got %q", "456", data.Body)
+			}
+		}
+
+		return nil
+	})
+	e.ServeHTTP(rec, req)
+}
+
 func TestBindBody(t *testing.T) {
 	scenarios := []struct {
 		body        io.Reader