forked from Mirrors/jsonapi
382 lines
8.9 KiB
Go
382 lines
8.9 KiB
Go
package jsonapi
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"reflect"
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"strconv"
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"strings"
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"time"
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)
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const unsuportedStructTagMsg = "Unsupported jsonapi tag annotation, %s"
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var (
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ErrInvalidTime = errors.New("Only numbers can be parsed as dates, unix timestamps")
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ErrUnknownFieldNumberType = errors.New("The struct field was not of a known number type")
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)
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// Convert an io into a struct instance using jsonapi tags on struct fields.
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// Method supports single request payloads only, at the moment. Bulk creates and updates
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// are not supported yet.
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//
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// Will Unmarshal embedded and sideloaded payloads. The latter is only possible if the
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// object graph is complete. That is, in the "relationships" data there are type and id,
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// keys that correspond to records in the "included" array.
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//
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// For example you could pass it, in, req.Body and, model, a BlogPost
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// struct instance to populate in an http handler,
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//
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// func CreateBlog(w http.ResponseWriter, r *http.Request) {
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// blog := new(Blog)
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//
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// if err := jsonapi.UnmarshalPayload(r.Body, blog); err != nil {
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// http.Error(w, err.Error(), 500)
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// return
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// }
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//
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// // ...do stuff with your blog...
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//
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// w.WriteHeader(201)
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// w.Header().Set("Content-Type", "application/vnd.api+json")
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//
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// if err := jsonapi.MarshalOnePayload(w, blog); err != nil {
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// http.Error(w, err.Error(), 500)
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// }
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// }
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//
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//
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// Visit https://github.com/shwoodard/jsonapi#create for more info.
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//
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// model interface{} should be a pointer to a struct.
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func UnmarshalPayload(in io.Reader, model interface{}) error {
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payload := new(OnePayload)
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if err := json.NewDecoder(in).Decode(payload); err != nil {
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return err
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}
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if payload.Included != nil {
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includedMap := make(map[string]*Node)
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for _, included := range payload.Included {
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key := fmt.Sprintf("%s,%s", included.Type, included.ID)
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includedMap[key] = included
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}
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return unmarshalNode(payload.Data, reflect.ValueOf(model), &includedMap)
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} else {
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return unmarshalNode(payload.Data, reflect.ValueOf(model), nil)
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}
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}
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func UnmarshalManyPayload(in io.Reader, t reflect.Type) ([]interface{}, error) {
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payload := new(ManyPayload)
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if err := json.NewDecoder(in).Decode(payload); err != nil {
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return nil, err
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}
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if payload.Included != nil {
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includedMap := make(map[string]*Node)
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for _, included := range payload.Included {
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key := fmt.Sprintf("%s,%s", included.Type, included.ID)
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includedMap[key] = included
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}
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var models []interface{}
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for _, data := range payload.Data {
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model := reflect.New(t.Elem())
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err := unmarshalNode(data, model, &includedMap)
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if err != nil {
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return nil, err
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}
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models = append(models, model.Interface())
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}
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return models, nil
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} else {
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var models []interface{}
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for _, data := range payload.Data {
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model := reflect.New(t.Elem())
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err := unmarshalNode(data, model, nil)
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if err != nil {
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return nil, err
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}
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models = append(models, model.Interface())
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}
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return models, nil
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}
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}
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func unmarshalNode(data *Node, model reflect.Value, included *map[string]*Node) (err error) {
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defer func() {
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if r := recover(); r != nil {
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err = fmt.Errorf("data is not a jsonapi representation of '%v'", model.Type())
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}
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}()
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modelValue := model.Elem()
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modelType := model.Type().Elem()
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var er error
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for i := 0; i < modelValue.NumField(); i++ {
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fieldType := modelType.Field(i)
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tag := fieldType.Tag.Get("jsonapi")
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if tag == "" {
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continue
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}
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fieldValue := modelValue.Field(i)
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args := strings.Split(tag, ",")
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if len(args) < 1 {
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er = ErrBadJSONAPIStructTag
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break
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}
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annotation := args[0]
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if (annotation == "client-id" && len(args) != 1) || (annotation != "client-id" && len(args) < 2) {
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er = ErrBadJSONAPIStructTag
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break
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}
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if annotation == "primary" {
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if data.ID == "" {
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continue
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}
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if data.Type != args[1] {
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er = fmt.Errorf("Trying to Unmarshal an object of type %#v, but %#v does not match", data.Type, args[1])
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break
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}
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if fieldValue.Kind() == reflect.String {
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fieldValue.Set(reflect.ValueOf(data.ID))
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} else if fieldValue.Kind() == reflect.Int {
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id, err := strconv.Atoi(data.ID)
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if err != nil {
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er = err
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break
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}
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fieldValue.SetInt(int64(id))
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} else {
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er = ErrBadJSONAPIID
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break
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}
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} else if annotation == "client-id" {
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if data.ClientID == "" {
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continue
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}
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fieldValue.Set(reflect.ValueOf(data.ClientID))
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} else if annotation == "attr" {
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attributes := data.Attributes
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if attributes == nil || len(data.Attributes) == 0 {
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continue
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}
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val := attributes[args[1]]
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// continue if the attribute was not included in the request
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if val == nil {
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continue
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}
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v := reflect.ValueOf(val)
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if fieldValue.Type() == reflect.TypeOf(time.Time{}) {
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var at int64
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if v.Kind() == reflect.Float64 {
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at = int64(v.Interface().(float64))
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} else if v.Kind() == reflect.Int {
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at = v.Int()
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} else {
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er = ErrInvalidTime
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break
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}
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t := time.Unix(at, 0)
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fieldValue.Set(reflect.ValueOf(t))
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continue
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}
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if fieldValue.Type() == reflect.TypeOf([]string(nil)) {
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values := make([]string, v.Len())
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for i := 0; i < v.Len(); i++ {
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values[i] = v.Index(i).Interface().(string)
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}
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fieldValue.Set(reflect.ValueOf(values))
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continue
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}
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if fieldValue.Type() == reflect.TypeOf(new(time.Time)) {
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var at int64
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if v.Kind() == reflect.Float64 {
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at = int64(v.Interface().(float64))
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} else if v.Kind() == reflect.Int {
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at = v.Int()
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} else {
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er = ErrInvalidTime
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break
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}
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v := time.Unix(at, 0)
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t := &v
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fieldValue.Set(reflect.ValueOf(t))
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continue
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}
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if v.Kind() == reflect.Float64 {
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// Handle JSON numeric case
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floatValue := v.Interface().(float64)
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// The field may or may not be a pointer to a numeric; the kind var
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// will not contain a pointer type
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var kind reflect.Kind
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if fieldValue.Kind() == reflect.Ptr {
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kind = fieldType.Type.Elem().Kind()
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} else {
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kind = fieldType.Type.Kind()
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}
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var numericValue reflect.Value
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switch kind {
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case reflect.Int:
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n := int(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Int8:
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n := int8(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Int16:
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n := int16(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Int32:
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n := int32(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Int64:
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n := int64(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Uint:
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n := uint(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Uint8:
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n := uint8(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Uint16:
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n := uint16(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Uint32:
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n := uint32(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Uint64:
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n := uint64(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Float32:
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n := float32(floatValue)
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numericValue = reflect.ValueOf(&n)
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case reflect.Float64:
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n := float64(floatValue)
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numericValue = reflect.ValueOf(&n)
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default:
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er = ErrUnknownFieldNumberType
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break
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}
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if fieldValue.Kind() == reflect.Ptr {
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fieldValue.Set(numericValue)
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} else {
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fieldValue.Set(reflect.Indirect(numericValue))
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}
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continue
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}
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fieldValue.Set(reflect.ValueOf(val))
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} else if annotation == "relation" {
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isSlice := fieldValue.Type().Kind() == reflect.Slice
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if data.Relationships == nil || data.Relationships[args[1]] == nil {
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continue
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}
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if isSlice {
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relationship := new(RelationshipManyNode)
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buf := bytes.NewBuffer(nil)
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json.NewEncoder(buf).Encode(data.Relationships[args[1]])
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json.NewDecoder(buf).Decode(relationship)
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data := relationship.Data
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models := reflect.New(fieldValue.Type()).Elem()
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for _, n := range data {
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m := reflect.New(fieldValue.Type().Elem().Elem())
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if err := unmarshalNode(fullNode(n, included), m, included); err != nil {
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er = err
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break
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}
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models = reflect.Append(models, m)
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}
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fieldValue.Set(models)
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} else {
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relationship := new(RelationshipOneNode)
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buf := bytes.NewBuffer(nil)
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json.NewEncoder(buf).Encode(data.Relationships[args[1]])
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json.NewDecoder(buf).Decode(relationship)
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m := reflect.New(fieldValue.Type().Elem())
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if err := unmarshalNode(fullNode(relationship.Data, included), m, included); err != nil {
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er = err
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break
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}
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fieldValue.Set(m)
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}
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} else {
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er = fmt.Errorf(unsuportedStructTagMsg, annotation)
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}
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}
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if er != nil {
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return er
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}
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return nil
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}
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func fullNode(n *Node, included *map[string]*Node) *Node {
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includedKey := fmt.Sprintf("%s,%s", n.Type, n.ID)
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if included != nil && (*included)[includedKey] != nil {
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return (*included)[includedKey]
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}
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return n
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}
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