diff --git a/binding/form_mapping.go b/binding/form_mapping.go index 77a1bde6..db235e56 100644 --- a/binding/form_mapping.go +++ b/binding/form_mapping.go @@ -165,6 +165,23 @@ func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter return setter.TrySet(value, field, tagValue, setOpt) } +// BindUnmarshaler is the interface used to wrap the UnmarshalParam method. +type BindUnmarshaler interface { + // UnmarshalParam decodes and assigns a value from an form or query param. + UnmarshalParam(param string) error +} + +// trySetCustom tries to set a custom type value +// If the value implements the BindUnmarshaler interface, it will be used to set the value, we will return `true` +// to skip the default value setting. +func trySetCustom(val string, value reflect.Value) (isSet bool, err error) { + switch v := value.Addr().Interface().(type) { + case BindUnmarshaler: + return true, v.UnmarshalParam(val) + } + return false, nil +} + func setByForm(value reflect.Value, field reflect.StructField, form map[string][]string, tagValue string, opt setOptions) (isSet bool, err error) { vs, ok := form[tagValue] if !ok && !opt.isDefaultExists { @@ -194,6 +211,9 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][ if len(vs) > 0 { val = vs[0] } + if ok, err := trySetCustom(val, value); ok { + return ok, err + } return true, setWithProperType(val, value, field) } } diff --git a/binding/form_mapping_test.go b/binding/form_mapping_test.go index 16527eb9..ed01a086 100644 --- a/binding/form_mapping_test.go +++ b/binding/form_mapping_test.go @@ -5,8 +5,11 @@ package binding import ( + "fmt" "mime/multipart" "reflect" + "strconv" + "strings" "testing" "time" @@ -323,3 +326,99 @@ func TestMappingIgnoredCircularRef(t *testing.T) { err := mappingByPtr(&s, formSource{}, "form") assert.NoError(t, err) } + +type customUnmarshalParamHex int + +func (f *customUnmarshalParamHex) UnmarshalParam(param string) error { + v, err := strconv.ParseInt(param, 16, 64) + if err != nil { + return err + } + *f = customUnmarshalParamHex(v) + return nil +} + +func TestMappingCustomUnmarshalParamHexWithFormTag(t *testing.T) { + var s struct { + Foo customUnmarshalParamHex `form:"foo"` + } + err := mappingByPtr(&s, formSource{"foo": {`f5`}}, "form") + assert.NoError(t, err) + + assert.EqualValues(t, 245, s.Foo) +} + +func TestMappingCustomUnmarshalParamHexWithURITag(t *testing.T) { + var s struct { + Foo customUnmarshalParamHex `uri:"foo"` + } + err := mappingByPtr(&s, formSource{"foo": {`f5`}}, "uri") + assert.NoError(t, err) + + assert.EqualValues(t, 245, s.Foo) +} + +type customUnmarshalParamType struct { + Protocol string + Path string + Name string +} + +func (f *customUnmarshalParamType) UnmarshalParam(param string) error { + parts := strings.Split(param, ":") + if len(parts) != 3 { + return fmt.Errorf("invalid format") + } + f.Protocol = parts[0] + f.Path = parts[1] + f.Name = parts[2] + return nil +} + +func TestMappingCustomStructTypeWithFormTag(t *testing.T) { + var s struct { + FileData customUnmarshalParamType `form:"data"` + } + err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "form") + assert.NoError(t, err) + + assert.EqualValues(t, "file", s.FileData.Protocol) + assert.EqualValues(t, "/foo", s.FileData.Path) + assert.EqualValues(t, "happiness", s.FileData.Name) +} + +func TestMappingCustomStructTypeWithURITag(t *testing.T) { + var s struct { + FileData customUnmarshalParamType `uri:"data"` + } + err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "uri") + assert.NoError(t, err) + + assert.EqualValues(t, "file", s.FileData.Protocol) + assert.EqualValues(t, "/foo", s.FileData.Path) + assert.EqualValues(t, "happiness", s.FileData.Name) +} + +func TestMappingCustomPointerStructTypeWithFormTag(t *testing.T) { + var s struct { + FileData *customUnmarshalParamType `form:"data"` + } + err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "form") + assert.NoError(t, err) + + assert.EqualValues(t, "file", s.FileData.Protocol) + assert.EqualValues(t, "/foo", s.FileData.Path) + assert.EqualValues(t, "happiness", s.FileData.Name) +} + +func TestMappingCustomPointerStructTypeWithURITag(t *testing.T) { + var s struct { + FileData *customUnmarshalParamType `uri:"data"` + } + err := mappingByPtr(&s, formSource{"data": {`file:/foo:happiness`}}, "uri") + assert.NoError(t, err) + + assert.EqualValues(t, "file", s.FileData.Protocol) + assert.EqualValues(t, "/foo", s.FileData.Path) + assert.EqualValues(t, "happiness", s.FileData.Name) +} diff --git a/docs/doc.md b/docs/doc.md index 70c9f275..177c4471 100644 --- a/docs/doc.md +++ b/docs/doc.md @@ -27,6 +27,7 @@ - [Only Bind Query String](#only-bind-query-string) - [Bind Query String or Post Data](#bind-query-string-or-post-data) - [Bind Uri](#bind-uri) + - [Bind custom unmarshaler](#bind-custom-unmarshaler) - [Bind Header](#bind-header) - [Bind HTML checkboxes](#bind-html-checkboxes) - [Multipart/Urlencoded binding](#multiparturlencoded-binding) @@ -899,6 +900,46 @@ curl -v localhost:8088/thinkerou/987fbc97-4bed-5078-9f07-9141ba07c9f3 curl -v localhost:8088/thinkerou/not-uuid ``` +### Bind custom unmarshaler + +```go +package main + +import ( + "github.com/gin-gonic/gin" + "strings" +) + +type Birthday string + +func (b *Birthday) UnmarshalParam(param string) error { + *b = Birthday(strings.Replace(param, "-", "/", -1)) + return nil +} + +func main() { + route := gin.Default() + var request struct { + Birthday Birthday `form:"birthday"` + } + route.GET("/test", func(ctx *gin.Context) { + _ = ctx.BindQuery(&request) + ctx.JSON(200, request.Birthday) + }) + route.Run(":8088") +} +``` + +Test it with: + +```sh +curl 'localhost:8088/test?birthday=2000-01-01' +``` +Result +```sh +"2000/01/01" +``` + ### Bind Header ```go diff --git a/gin_test.go b/gin_test.go index 4550a7e5..e68f1ce8 100644 --- a/gin_test.go +++ b/gin_test.go @@ -14,6 +14,7 @@ import ( "net/http/httptest" "reflect" "strconv" + "strings" "sync/atomic" "testing" "time" @@ -730,3 +731,26 @@ func TestWithOptionFunc(t *testing.T) { assertRoutePresent(t, routes, RouteInfo{Path: "/test1", Method: "GET", Handler: "github.com/gin-gonic/gin.handlerTest1"}) assertRoutePresent(t, routes, RouteInfo{Path: "/test2", Method: "GET", Handler: "github.com/gin-gonic/gin.handlerTest2"}) } + +type Birthday string + +func (b *Birthday) UnmarshalParam(param string) error { + *b = Birthday(strings.Replace(param, "-", "/", -1)) + return nil +} + +func TestCustomUnmarshalStruct(t *testing.T) { + route := Default() + var request struct { + Birthday Birthday `form:"birthday"` + } + route.GET("/test", func(ctx *Context) { + _ = ctx.BindQuery(&request) + ctx.JSON(200, request.Birthday) + }) + req := httptest.NewRequest("GET", "/test?birthday=2000-01-01", nil) + w := httptest.NewRecorder() + route.ServeHTTP(w, req) + assert.Equal(t, 200, w.Code) + assert.Equal(t, `"2000/01/01"`, w.Body.String()) +}