1 files changed, 148 insertions, 0 deletions
diff --git a/clientapi/jsonerror/jsonerror.go b/clientapi/jsonerror/jsonerror.go
new file mode 100644
index 00000000..fa15d9d8
--- /dev/null
+++ b/clientapi/jsonerror/jsonerror.go
@@ -0,0 +1,148 @@
+// Copyright 2017 Vector Creations Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package jsonerror
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/matrix-org/util"
+)
+
+// MatrixError represents the "standard error response" in Matrix.
+// http://matrix.org/docs/spec/client_server/r0.2.0.html#api-standards
+type MatrixError struct {
+	ErrCode string `json:"errcode"`
+	Err     string `json:"error"`
+}
+
+func (e MatrixError) Error() string {
+	return fmt.Sprintf("%s: %s", e.ErrCode, e.Err)
+}
+
+// InternalServerError returns a 500 Internal Server Error in a matrix-compliant
+// format.
+func InternalServerError() util.JSONResponse {
+	return util.JSONResponse{
+		Code: http.StatusInternalServerError,
+		JSON: Unknown("Internal Server Error"),
+	}
+}
+
+// Unknown is an unexpected error
+func Unknown(msg string) *MatrixError {
+	return &MatrixError{"M_UNKNOWN", msg}
+}
+
+// Forbidden is an error when the client tries to access a resource
+// they are not allowed to access.
+func Forbidden(msg string) *MatrixError {
+	return &MatrixError{"M_FORBIDDEN", msg}
+}
+
+// BadJSON is an error when the client supplies malformed JSON.
+func BadJSON(msg string) *MatrixError {
+	return &MatrixError{"M_BAD_JSON", msg}
+}
+
+// NotJSON is an error when the client supplies something that is not JSON
+// to a JSON endpoint.
+func NotJSON(msg string) *MatrixError {
+	return &MatrixError{"M_NOT_JSON", msg}
+}
+
+// NotFound is an error when the client tries to access an unknown resource.
+func NotFound(msg string) *MatrixError {
+	return &MatrixError{"M_NOT_FOUND", msg}
+}
+
+// MissingArgument is an error when the client tries to access a resource
+// without providing an argument that is required.
+func MissingArgument(msg string) *MatrixError {
+	return &MatrixError{"M_MISSING_ARGUMENT", msg}
+}
+
+// InvalidArgumentValue is an error when the client tries to provide an
+// invalid value for a valid argument
+func InvalidArgumentValue(msg string) *MatrixError {
+	return &MatrixError{"M_INVALID_ARGUMENT_VALUE", msg}
+}
+
+// MissingToken is an error when the client tries to access a resource which
+// requires authentication without supplying credentials.
+func MissingToken(msg string) *MatrixError {
+	return &MatrixError{"M_MISSING_TOKEN", msg}
+}
+
+// UnknownToken is an error when the client tries to access a resource which
+// requires authentication and supplies an unrecognized token
+func UnknownToken(msg string) *MatrixError {
+	return &MatrixError{"M_UNKNOWN_TOKEN", msg}
+}
+
+// WeakPassword is an error which is returned when the client tries to register
+// using a weak password. http://matrix.org/docs/spec/client_server/r0.2.0.html#password-based
+func WeakPassword(msg string) *MatrixError {
+	return &MatrixError{"M_WEAK_PASSWORD", msg}
+}
+
+// InvalidUsername is an error returned when the client tries to register an
+// invalid username
+func InvalidUsername(msg string) *MatrixError {
+	return &MatrixError{"M_INVALID_USERNAME", msg}
+}
+
+// UserInUse is an error returned when the client tries to register an
+// username that already exists
+func UserInUse(msg string) *MatrixError {
+	return &MatrixError{"M_USER_IN_USE", msg}
+}
+
+// ASExclusive is an error returned when an application service tries to
+// register an username that is outside of its registered namespace, or if a
+// user attempts to register a username or room alias within an exclusive
+// namespace.
+func ASExclusive(msg string) *MatrixError {
+	return &MatrixError{"M_EXCLUSIVE", msg}
+}
+
+// GuestAccessForbidden is an error which is returned when the client is
+// forbidden from accessing a resource as a guest.
+func GuestAccessForbidden(msg string) *MatrixError {
+	return &MatrixError{"M_GUEST_ACCESS_FORBIDDEN", msg}
+}
+
+// LimitExceededError is a rate-limiting error.
+type LimitExceededError struct {
+	MatrixError
+	RetryAfterMS int64 `json:"retry_after_ms,omitempty"`
+}
+
+// LimitExceeded is an error when the client tries to send events too quickly.
+func LimitExceeded(msg string, retryAfterMS int64) *LimitExceededError {
+	return &LimitExceededError{
+		MatrixError:  MatrixError{"M_LIMIT_EXCEEDED", msg},
+		RetryAfterMS: retryAfterMS,
+	}
+}
+
+// NotTrusted is an error which is returned when the client asks the server to
+// proxy a request (e.g. 3PID association) to a server that isn't trusted
+func NotTrusted(serverName string) *MatrixError {
+	return &MatrixError{
+		ErrCode: "M_SERVER_NOT_TRUSTED",
+		Err:     fmt.Sprintf("Untrusted server '%s'", serverName),
+	}
+}