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Tests

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This commit is contained in:
binwiederhier 2022-12-29 09:57:42 -05:00
parent 66cb35b5fc
commit 57814cf855
8 changed files with 209 additions and 37 deletions
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10
server/errors.go
View file

@ -48,19 +48,21 @@ var (
errHTTPBadRequestAttachmentsDisallowed = &errHTTP{40014, http.StatusBadRequest, "invalid request: attachments not allowed", "https://ntfy.sh/docs/config/#attachments"}
errHTTPBadRequestAttachmentsExpiryBeforeDelivery = &errHTTP{40015, http.StatusBadRequest, "invalid request: attachment expiry before delayed delivery date", "https://ntfy.sh/docs/publish/#scheduled-delivery"}
errHTTPBadRequestWebSocketsUpgradeHeaderMissing = &errHTTP{40016, http.StatusBadRequest, "invalid request: client not using the websocket protocol", "https://ntfy.sh/docs/subscribe/api/#websockets"}
errHTTPBadRequestJSONInvalid = &errHTTP{40017, http.StatusBadRequest, "invalid request: request body must be message JSON", "https://ntfy.sh/docs/publish/#publish-as-json"}
errHTTPBadRequestMessageJSONInvalid = &errHTTP{40017, http.StatusBadRequest, "invalid request: request body must be message JSON", "https://ntfy.sh/docs/publish/#publish-as-json"}
errHTTPBadRequestActionsInvalid = &errHTTP{40018, http.StatusBadRequest, "invalid request: actions invalid", "https://ntfy.sh/docs/publish/#action-buttons"}
errHTTPBadRequestMatrixMessageInvalid = &errHTTP{40019, http.StatusBadRequest, "invalid request: Matrix JSON invalid", "https://ntfy.sh/docs/publish/#matrix-gateway"}
errHTTPBadRequestMatrixPushkeyBaseURLMismatch = &errHTTP{40020, http.StatusBadRequest, "invalid request: push key must be prefixed with base URL", "https://ntfy.sh/docs/publish/#matrix-gateway"}
errHTTPBadRequestIconURLInvalid = &errHTTP{40021, http.StatusBadRequest, "invalid request: icon URL is invalid", "https://ntfy.sh/docs/publish/#icons"}
errHTTPBadRequestSignupNotEnabled = &errHTTP{40022, http.StatusBadRequest, "invalid request: signup not enabled", "https://ntfy.sh/docs/config"}
errHTTPBadRequestNoTokenProvided = &errHTTP{40023, http.StatusBadRequest, "invalid request: no token provided", ""}
errHTTPBadRequestJSONInvalid = &errHTTP{40024, http.StatusBadRequest, "invalid request: request body must be valid JSON", ""}
errHTTPNotFound = &errHTTP{40401, http.StatusNotFound, "page not found", ""}
errHTTPUnauthorized = &errHTTP{40101, http.StatusUnauthorized, "unauthorized", "https://ntfy.sh/docs/publish/#authentication"}
errHTTPForbidden = &errHTTP{40301, http.StatusForbidden, "forbidden", "https://ntfy.sh/docs/publish/#authentication"}
errHTTPConflictUserExists = &errHTTP{40901, http.StatusConflict, "conflict: user already exists", ""}
errHTTPEntityTooLargeAttachmentTooLarge = &errHTTP{41301, http.StatusRequestEntityTooLarge, "attachment too large, or bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations"}
errHTTPEntityTooLargeMatrixRequestTooLarge = &errHTTP{41302, http.StatusRequestEntityTooLarge, "Matrix request is larger than the max allowed length", ""}
errHTTPEntityTooLargeAttachment = &errHTTP{41301, http.StatusRequestEntityTooLarge, "attachment too large, or bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations"}
errHTTPEntityTooLargeMatrixRequest = &errHTTP{41302, http.StatusRequestEntityTooLarge, "Matrix request is larger than the max allowed length", ""}
errHTTPEntityTooLargeJSONBody = &errHTTP{41303, http.StatusRequestEntityTooLarge, "JSON body too large", ""}
errHTTPTooManyRequestsLimitRequests = &errHTTP{42901, http.StatusTooManyRequests, "limit reached: too many requests, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
errHTTPTooManyRequestsLimitEmails = &errHTTP{42902, http.StatusTooManyRequests, "limit reached: too many emails, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
errHTTPTooManyRequestsLimitSubscriptions = &errHTTP{42903, http.StatusTooManyRequests, "limit reached: too many active subscriptions, please be nice", "https://ntfy.sh/docs/publish/#limitations"}
@ -68,6 +70,6 @@ var (
errHTTPTooManyRequestsAttachmentBandwidthLimit = &errHTTP{42905, http.StatusTooManyRequests, "too many requests: daily bandwidth limit reached", "https://ntfy.sh/docs/publish/#limitations"}
errHTTPTooManyRequestsAccountCreateLimit = &errHTTP{42906, http.StatusTooManyRequests, "too many requests: daily account creation limit reached", "https://ntfy.sh/docs/publish/#limitations"} // FIXME document limit
errHTTPInternalError = &errHTTP{50001, http.StatusInternalServerError, "internal server error", ""}
errHTTPInternalErrorInvalidFilePath = &errHTTP{50002, http.StatusInternalServerError, "internal server error: invalid file path", ""}
errHTTPInternalErrorInvalidPath = &errHTTP{50002, http.StatusInternalServerError, "internal server error: invalid file path", ""}
errHTTPInternalErrorMissingBaseURL = &errHTTP{50003, http.StatusInternalServerError, "internal server error: base-url must be be configured for this feature", "https://ntfy.sh/docs/config/"}
)

19
server/server.go
View file

@ -479,7 +479,7 @@ func (s *Server) handleFile(w http.ResponseWriter, r *http.Request, v *visitor)
}
matches := fileRegex.FindStringSubmatch(r.URL.Path)
if len(matches) != 2 {
return errHTTPInternalErrorInvalidFilePath
return errHTTPInternalErrorInvalidPath
}
messageID := matches[1]
file := filepath.Join(s.config.AttachmentCacheDir, messageID)
@ -815,7 +815,7 @@ func (s *Server) handleBodyAsAttachment(r *http.Request, v *visitor, m *message,
if contentLengthStr != "" { // Early "do-not-trust" check, hard limit see below
contentLength, err := strconv.ParseInt(contentLengthStr, 10, 64)
if err == nil && (contentLength > stats.AttachmentTotalSizeRemaining || contentLength > stats.AttachmentFileSizeLimit) {
return errHTTPEntityTooLargeAttachmentTooLarge
return errHTTPEntityTooLargeAttachment
}
}
if m.Attachment == nil {
@ -839,7 +839,7 @@ func (s *Server) handleBodyAsAttachment(r *http.Request, v *visitor, m *message,
}
m.Attachment.Size, err = s.fileCache.Write(m.ID, body, limiters...)
if err == util.ErrLimitReached {
return errHTTPEntityTooLargeAttachmentTooLarge
return errHTTPEntityTooLargeAttachment
} else if err != nil {
return err
}
@ -1426,15 +1426,10 @@ func (s *Server) ensureUser(next handleFunc) handleFunc {
// before passing it on to the next handler. This is meant to be used in combination with handlePublish.
func (s *Server) transformBodyJSON(next handleFunc) handleFunc {
return func(w http.ResponseWriter, r *http.Request, v *visitor) error {
body, err := util.Peek(r.Body, s.config.MessageLimit)
m, err := readJSONWithLimit[publishMessage](r.Body, s.config.MessageLimit)
if err != nil {
return err
}
defer r.Body.Close()
var m publishMessage
if err := json.NewDecoder(body).Decode(&m); err != nil {
return errHTTPBadRequestJSONInvalid
}
if !topicRegex.MatchString(m.Topic) {
return errHTTPBadRequestTopicInvalid
}
@ -1467,7 +1462,7 @@ func (s *Server) transformBodyJSON(next handleFunc) handleFunc {
if len(m.Actions) > 0 {
actionsStr, err := json.Marshal(m.Actions)
if err != nil {
return errHTTPBadRequestJSONInvalid
return errHTTPBadRequestMessageJSONInvalid
}
r.Header.Set("X-Actions", string(actionsStr))
}
@ -1535,7 +1530,9 @@ func (s *Server) visitor(r *http.Request) (v *visitor, err error) {
} else {
v = s.visitorFromIP(ip)
}
v.user = u // Update user -- FIXME race?
v.mu.Lock()
v.user = u
v.mu.Unlock()
return v, err // Always return visitor, even when error occurs!
}

26
server/server_account.go
View file

@ -2,7 +2,6 @@ package server
import (
"encoding/json"
"errors"
"heckel.io/ntfy/user"
"heckel.io/ntfy/util"
"net/http"
@ -21,7 +20,7 @@ func (s *Server) handleAccountCreate(w http.ResponseWriter, r *http.Request, v *
return errHTTPUnauthorized // Cannot create account from user context
}
}
newAccount, err := util.ReadJSONWithLimit[apiAccountCreateRequest](r.Body, jsonBodyBytesLimit)
newAccount, err := readJSONWithLimit[apiAccountCreateRequest](r.Body, jsonBodyBytesLimit)
if err != nil {
return err
}
@ -118,7 +117,7 @@ func (s *Server) handleAccountDelete(w http.ResponseWriter, r *http.Request, v *
}
func (s *Server) handleAccountPasswordChange(w http.ResponseWriter, r *http.Request, v *visitor) error {
newPassword, err := util.ReadJSONWithLimit[apiAccountPasswordChangeRequest](r.Body, jsonBodyBytesLimit)
newPassword, err := readJSONWithLimit[apiAccountPasswordChangeRequest](r.Body, jsonBodyBytesLimit)
if err != nil {
return err
}
@ -174,7 +173,7 @@ func (s *Server) handleAccountTokenExtend(w http.ResponseWriter, r *http.Request
func (s *Server) handleAccountTokenDelete(w http.ResponseWriter, r *http.Request, v *visitor) error {
// TODO rate limit
if v.user.Token == "" {
return errHTTPUnauthorized
return errHTTPBadRequestNoTokenProvided
}
if err := s.userManager.RemoveToken(v.user); err != nil {
return err
@ -184,7 +183,7 @@ func (s *Server) handleAccountTokenDelete(w http.ResponseWriter, r *http.Request
}
func (s *Server) handleAccountSettingsChange(w http.ResponseWriter, r *http.Request, v *visitor) error {
newPrefs, err := util.ReadJSONWithLimit[user.Prefs](r.Body, jsonBodyBytesLimit)
newPrefs, err := readJSONWithLimit[user.Prefs](r.Body, jsonBodyBytesLimit)
if err != nil {
return err
}
@ -218,7 +217,7 @@ func (s *Server) handleAccountSettingsChange(w http.ResponseWriter, r *http.Requ
}
func (s *Server) handleAccountSubscriptionAdd(w http.ResponseWriter, r *http.Request, v *visitor) error {
newSubscription, err := util.ReadJSONWithLimit[user.Subscription](r.Body, jsonBodyBytesLimit)
newSubscription, err := readJSONWithLimit[user.Subscription](r.Body, jsonBodyBytesLimit)
if err != nil {
return err
}
@ -250,13 +249,13 @@ func (s *Server) handleAccountSubscriptionAdd(w http.ResponseWriter, r *http.Req
func (s *Server) handleAccountSubscriptionChange(w http.ResponseWriter, r *http.Request, v *visitor) error {
matches := accountSubscriptionSingleRegex.FindStringSubmatch(r.URL.Path)
if len(matches) != 2 {
return errHTTPInternalErrorInvalidFilePath // FIXME
return errHTTPInternalErrorInvalidPath
}
updatedSubscription, err := util.ReadJSONWithLimit[user.Subscription](r.Body, jsonBodyBytesLimit)
subscriptionID := matches[1]
updatedSubscription, err := readJSONWithLimit[user.Subscription](r.Body, jsonBodyBytesLimit)
if err != nil {
return err
}
subscriptionID := matches[1]
if v.user.Prefs == nil || v.user.Prefs.Subscriptions == nil {
return errHTTPNotFound
}
@ -283,14 +282,9 @@ func (s *Server) handleAccountSubscriptionChange(w http.ResponseWriter, r *http.
}
func (s *Server) handleAccountSubscriptionDelete(w http.ResponseWriter, r *http.Request, v *visitor) error {
if v.user == nil {
return errors.New("no user")
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // FIXME remove this
matches := accountSubscriptionSingleRegex.FindStringSubmatch(r.URL.Path)
if len(matches) != 2 {
return errHTTPInternalErrorInvalidFilePath // FIXME
return errHTTPInternalErrorInvalidPath
}
subscriptionID := matches[1]
if v.user.Prefs == nil || v.user.Prefs.Subscriptions == nil {
@ -308,5 +302,7 @@ func (s *Server) handleAccountSubscriptionDelete(w http.ResponseWriter, r *http.
return err
}
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*") // FIXME remove this
return nil
}

157
server/server_account_test.go
View file

@ -62,6 +62,25 @@ func TestAccount_Signup_LimitReached(t *testing.T) {
require.Equal(t, 42906, toHTTPError(t, rr.Body.String()).Code)
}
func TestAccount_Signup_AsUser(t *testing.T) {
conf := newTestConfigWithUsers(t)
conf.EnableSignup = true
s := newTestServer(t, conf)
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleAdmin))
require.Nil(t, s.userManager.AddUser("ben", "ben", user.RoleUser))
rr := request(t, s, "POST", "/v1/account", `{"username":"emma", "password":"emma"}`, map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "POST", "/v1/account", `{"username":"marian", "password":"marian"}`, map[string]string{
"Authorization": util.BasicAuth("ben", "ben"),
})
require.Equal(t, 401, rr.Code)
}
func TestAccount_Signup_Disabled(t *testing.T) {
conf := newTestConfigWithUsers(t)
conf.EnableSignup = false
@ -112,6 +131,144 @@ func TestAccount_Get_Anonymous(t *testing.T) {
require.Equal(t, int64(23), account.Stats.EmailsRemaining)
}
func TestAccount_ChangeSettings(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
user, _ := s.userManager.User("phil")
token, _ := s.userManager.CreateToken(user)
rr := request(t, s, "PATCH", "/v1/account/settings", `{"notification": {"sound": "juntos"},"ignored": true}`, map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "PATCH", "/v1/account/settings", `{"notification": {"delete_after": 86400}, "language": "de"}`, map[string]string{
"Authorization": util.BearerAuth(token.Value),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "GET", "/v1/account", `{"username":"marian", "password":"marian"}`, map[string]string{
"Authorization": util.BearerAuth(token.Value),
})
require.Equal(t, 200, rr.Code)
account, _ := util.ReadJSON[apiAccountResponse](io.NopCloser(rr.Body))
require.Equal(t, "de", account.Language)
require.Equal(t, 86400, account.Notification.DeleteAfter)
require.Equal(t, "juntos", account.Notification.Sound)
require.Equal(t, 0, account.Notification.MinPriority) // Not set
}
func TestAccount_Subscription_AddUpdateDelete(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
rr := request(t, s, "POST", "/v1/account/subscription", `{"base_url": "http://abc.com", "topic": "def"}`, map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "GET", "/v1/account", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
account, _ := util.ReadJSON[apiAccountResponse](io.NopCloser(rr.Body))
require.Equal(t, 1, len(account.Subscriptions))
require.NotEmpty(t, account.Subscriptions[0].ID)
require.Equal(t, "http://abc.com", account.Subscriptions[0].BaseURL)
require.Equal(t, "def", account.Subscriptions[0].Topic)
require.Equal(t, "", account.Subscriptions[0].DisplayName)
subscriptionID := account.Subscriptions[0].ID
rr = request(t, s, "PATCH", "/v1/account/subscription/"+subscriptionID, `{"display_name": "ding dong"}`, map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "GET", "/v1/account", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
account, _ = util.ReadJSON[apiAccountResponse](io.NopCloser(rr.Body))
require.Equal(t, 1, len(account.Subscriptions))
require.Equal(t, subscriptionID, account.Subscriptions[0].ID)
require.Equal(t, "http://abc.com", account.Subscriptions[0].BaseURL)
require.Equal(t, "def", account.Subscriptions[0].Topic)
require.Equal(t, "ding dong", account.Subscriptions[0].DisplayName)
rr = request(t, s, "DELETE", "/v1/account/subscription/"+subscriptionID, "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "GET", "/v1/account", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
account, _ = util.ReadJSON[apiAccountResponse](io.NopCloser(rr.Body))
require.Equal(t, 0, len(account.Subscriptions))
}
func TestAccount_ChangePassword(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
rr := request(t, s, "POST", "/v1/account/password", `{"password": "new password"}`, map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
rr = request(t, s, "GET", "/v1/account", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 401, rr.Code)
rr = request(t, s, "GET", "/v1/account", "", map[string]string{
"Authorization": util.BasicAuth("phil", "new password"),
})
require.Equal(t, 200, rr.Code)
}
func TestAccount_ChangePassword_NoAccount(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
rr := request(t, s, "POST", "/v1/account/password", `{"password": "new password"}`, nil)
require.Equal(t, 401, rr.Code)
}
func TestAccount_ExtendToken(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
rr := request(t, s, "POST", "/v1/account/token", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"),
})
require.Equal(t, 200, rr.Code)
token, err := util.ReadJSON[apiAccountTokenResponse](io.NopCloser(rr.Body))
require.Nil(t, err)
time.Sleep(time.Second)
rr = request(t, s, "PATCH", "/v1/account/token", "", map[string]string{
"Authorization": util.BearerAuth(token.Token),
})
require.Equal(t, 200, rr.Code)
extendedToken, err := util.ReadJSON[apiAccountTokenResponse](io.NopCloser(rr.Body))
require.Nil(t, err)
require.Equal(t, token.Token, extendedToken.Token)
require.True(t, token.Expires < extendedToken.Expires)
}
func TestAccount_ExtendToken_NoTokenProvided(t *testing.T) {
s := newTestServer(t, newTestConfigWithUsers(t))
require.Nil(t, s.userManager.AddUser("phil", "phil", user.RoleUser))
rr := request(t, s, "PATCH", "/v1/account/token", "", map[string]string{
"Authorization": util.BasicAuth("phil", "phil"), // Not Bearer!
})
require.Equal(t, 400, rr.Code)
require.Equal(t, 40023, toHTTPError(t, rr.Body.String()).Code)
}
func TestAccount_Delete_Success(t *testing.T) {
conf := newTestConfigWithUsers(t)
conf.EnableSignup = true

2
server/server_matrix.go
View file

@ -113,7 +113,7 @@ func newRequestFromMatrixJSON(r *http.Request, baseURL string, messageLimit int)
}
defer r.Body.Close()
if body.LimitReached {
return nil, errHTTPEntityTooLargeMatrixRequestTooLarge
return nil, errHTTPEntityTooLargeMatrixRequest
}
var m matrixRequest
if err := json.Unmarshal(body.PeekedBytes, &m); err != nil {

2
server/server_matrix_test.go
View file

@ -29,7 +29,7 @@ func TestMatrix_NewRequestFromMatrixJSON_TooLarge(t *testing.T) {
body := `{"notification":{"content":{"body":"I'm floating in a most peculiar way.","msgtype":"m.text"},"counts":{"missed_calls":1,"unread":2},"devices":[{"app_id":"org.matrix.matrixConsole.ios","data":{},"pushkey":"https://ntfy.sh/upABCDEFGHI?up=1","pushkey_ts":12345678,"tweaks":{"sound":"bing"}}],"event_id":"$3957tyerfgewrf384","prio":"high","room_alias":"#exampleroom:matrix.org","room_id":"!slw48wfj34rtnrf:example.com","room_name":"Mission Control","sender":"@exampleuser:matrix.org","sender_display_name":"Major Tom","type":"m.room.message"}}`
r, _ := http.NewRequest("POST", "http://ntfy.example.com/_matrix/push/v1/notify", strings.NewReader(body))
_, err := newRequestFromMatrixJSON(r, baseURL, maxLength)
require.Equal(t, errHTTPEntityTooLargeMatrixRequestTooLarge, err)
require.Equal(t, errHTTPEntityTooLargeMatrixRequest, err)
}
func TestMatrix_NewRequestFromMatrixJSON_InvalidJSON(t *testing.T) {

13
server/util.go
View file

@ -5,6 +5,7 @@ import (
"github.com/emersion/go-smtp"
"heckel.io/ntfy/log"
"heckel.io/ntfy/util"
"io"
"net/http"
"net/netip"
"strings"
@ -121,3 +122,15 @@ func extractIPAddress(r *http.Request, behindProxy bool) netip.Addr {
}
return ip
}
func readJSONWithLimit[T any](r io.ReadCloser, limit int) (*T, error) {
obj, err := util.ReadJSONWithLimit[T](r, limit)
if err == util.ErrInvalidJSON {
return nil, errHTTPBadRequestJSONInvalid
} else if err == util.ErrTooLargeJSON {
return nil, errHTTPEntityTooLargeJSONBody
} else if err != nil {
return nil, err
}
return obj, nil
}

17
util/util.go
View file

@ -31,6 +31,11 @@ var (
noQuotesRegex = regexp.MustCompile(`^[-_./:@a-zA-Z0-9]+$`)
)
var (
ErrInvalidJSON = errors.New("invalid JSON")
ErrTooLargeJSON = errors.New("too large JSON")
)
// FileExists checks if a file exists, and returns true if it does
func FileExists(filename string) bool {
stat, _ := os.Stat(filename)
@ -293,21 +298,23 @@ func QuoteCommand(command []string) string {
func ReadJSON[T any](body io.ReadCloser) (*T, error) {
var obj T
if err := json.NewDecoder(body).Decode(&obj); err != nil {
return nil, err
return nil, ErrInvalidJSON
}
return &obj, nil
}
// ReadJSONWithLimit reads the given io.ReadCloser into a struct, but only until limit is reached
func ReadJSONWithLimit[T any](r io.ReadCloser, limit int) (*T, error) {
r, err := Peek(r, limit)
defer r.Close()
p, err := Peek(r, limit)
if err != nil {
return nil, err
} else if p.LimitReached {
return nil, ErrTooLargeJSON
}
defer r.Close()
var obj T
if err := json.NewDecoder(r).Decode(&obj); err != nil {
return nil, err
if err := json.NewDecoder(p).Decode(&obj); err != nil {
return nil, ErrInvalidJSON
}
return &obj, nil
}