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patch.go
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patch.go
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package handler
import (
"bytes"
"fmt"
"io"
"net/http"
"github.com/neuronlabs/jsonapi"
"github.com/neuronlabs/neuron-core/mapping"
"github.com/neuronlabs/neuron-core/query"
"github.com/neuronlabs/jsonapi-handler/errors"
"github.com/neuronlabs/jsonapi-handler/log"
)
// PatchWith returns JSONAPI patch EndpointHandler for the 'model'.
func (h *Creator) PatchWith(model interface{}) *EndpointHandler {
return &EndpointHandler{
handler: h.handlePatch,
model: h.c.MustGetModelStruct(model),
}
}
// Patch returns JSONAPI http.HandlerFunc for the 'model'.
func (h *Creator) Patch(model interface{}) http.HandlerFunc {
return h.handlePatch(h.c.MustGetModelStruct(model), "")
}
func (h *Creator) handlePatch(model *mapping.ModelStruct, basePath string) http.HandlerFunc {
return func(rw http.ResponseWriter, req *http.Request) {
var buf *bytes.Buffer
reader := io.Reader(req.Body)
// for debug purpose prepare the tee reader
if log.Level().IsAllowed(log.LDEBUG3) {
buf = &bytes.Buffer{}
reader = io.TeeReader(req.Body, buf)
}
id := CtxMustGetID(req.Context())
if id == "" {
log.Debugf("[PATCH][%s] Empty id params", model.Collection())
err := errors.ErrBadRequest()
err.Detail = "Provided empty 'id' in url"
h.marshalErrors(rw, req, 0, err)
return
}
idURLValue, err := model.Primary().ValueFromString(id)
if err != nil {
err := errors.ErrInvalidURI()
err.Detail = "Provided invalid 'id' value in url"
log.Debug2f("[PATCH][%s] invalid 'id' value: '%v'", model.Collection(), id)
h.marshalErrors(rw, req, 0, err)
return
}
s, err := jsonapi.UnmarshalSingleScopeC(h.c, reader, model, h.jsonapiUnmarshalOptions())
if err != nil {
if log.Level().IsAllowed(log.LDEBUG3) {
log.Debug3f("Unmarshal value: '%s' failed: %v", buf.String(), err)
}
h.marshalErrors(rw, req, 0, errors.MapError(err)...)
return
}
idDataValue, err := h.getFieldValue(s.Value, s.Struct().Primary())
if err != nil {
h.marshalErrors(rw, req, 0, errors.MapError(err)...)
return
}
if idDataValue != idURLValue {
err := errors.ErrIDConflict()
err.Detail = fmt.Sprintf("URL id value: '%s' doesn't match input data id value: '%v'", id, idDataValue)
log.Debug2f("[PATCH][%s] %s", model.Collection(), err.Detail)
h.marshalErrors(rw, req, 0, err)
return
}
ctx := req.Context()
// execute the before patcher API hook if given model defines it.
if beforePatchHook, ok := Hooks.getHook(model, BeforePatch); ok {
if err = beforePatchHook(ctx, s); err != nil {
h.marshalErrors(rw, req, 0, errors.MapError(err)...)
return
}
}
if err = s.PatchContext(ctx); err != nil {
log.Debug2f("[PATCH][%s][%s] failed: %v ", model.Collection(), s.ID(), err)
h.marshalErrors(rw, req, 0, errors.MapError(err)...)
return
}
// execute the before patcher API hook if given model defines it.
if afterPatchHook, ok := Hooks.getHook(model, AfterPatch); ok {
if err = afterPatchHook(ctx, s); err != nil {
h.marshalErrors(rw, req, 0, errors.MapError(err)...)
return
}
}
if req.Header.Get("Accept") != jsonapi.MediaType {
log.Debug3f("[PATCH][%s][%s] No 'Accept' Header - returning HTTP Status: No Content - 204", model.Collection(), s.ID())
rw.WriteHeader(http.StatusNoContent)
return
}
getScope := query.NewModelC(h.c, model, false)
if err = getScope.FilterField(query.NewFilter(model.Primary(), query.OpEqual, idDataValue)); err != nil {
log.Errorf("[PATCH][SCOPE][%s] Adding param primary filter to return content scope failed: %v", err)
h.marshalErrors(rw, req, 0, errors.ErrInternalError())
return
}
if err = getScope.GetContext(ctx); err != nil {
log.Debugf("[PATCH][%s][%s] Getting resource after patching failed: %v", model.Collection(), s.ID(), err)
rw.WriteHeader(http.StatusNoContent)
return
}
if basePath == "" {
basePath = h.basePath()
}
options := &jsonapi.MarshalOptions{Link: jsonapi.LinkOptions{
Type: jsonapi.ResourceLink,
BaseURL: basePath,
RootID: id,
Collection: model.Collection(),
}}
h.marshalScope(getScope, rw, req, http.StatusOK, options)
}
}