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// Copyright 2022 The Matrix.org Foundation C.I.C.
//
// 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 internal
import (
"errors"
"fmt"
"net/http"
"regexp"
"github.com/matrix-org/gomatrixserverlib/spec"
"github.com/matrix-org/util"
)
const (
maxUsernameLength = 254 // http://matrix.org/speculator/spec/HEAD/intro.html#user-identifiers TODO account for domain
minPasswordLength = 8 // http://matrix.org/docs/spec/client_server/r0.2.0.html#password-based
maxPasswordLength = 512 // https://github.com/matrix-org/synapse/blob/v0.20.0/synapse/rest/client/v2_alpha/register.py#L161
)
var (
ErrPasswordTooLong = fmt.Errorf("password too long: max %d characters", maxPasswordLength)
ErrPasswordWeak = fmt.Errorf("password too weak: min %d characters", minPasswordLength)
ErrUsernameTooLong = fmt.Errorf("username exceeds the maximum length of %d characters", maxUsernameLength)
ErrUsernameInvalid = errors.New("username can only contain characters a-z, 0-9, or '_-./='")
ErrUsernameUnderscore = errors.New("username cannot start with a '_'")
validUsernameRegex = regexp.MustCompile(`^[0-9a-z_\-=./]+$`)
)
// ValidatePassword returns an error if the password is invalid
func ValidatePassword(password string) error {
// https://github.com/matrix-org/synapse/blob/v0.20.0/synapse/rest/client/v2_alpha/register.py#L161
if len(password) > maxPasswordLength {
return ErrPasswordTooLong
} else if len(password) > 0 && len(password) < minPasswordLength {
return ErrPasswordWeak
}
return nil
}
// PasswordResponse returns a util.JSONResponse for a given error, if any.
func PasswordResponse(err error) *util.JSONResponse {
switch err {
case ErrPasswordWeak:
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.WeakPassword(ErrPasswordWeak.Error()),
}
case ErrPasswordTooLong:
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.BadJSON(ErrPasswordTooLong.Error()),
}
}
return nil
}
// ValidateUsername returns an error if the username is invalid
func ValidateUsername(localpart string, domain spec.ServerName) error {
// https://github.com/matrix-org/synapse/blob/v0.20.0/synapse/rest/client/v2_alpha/register.py#L161
if id := fmt.Sprintf("@%s:%s", localpart, domain); len(id) > maxUsernameLength {
return ErrUsernameTooLong
} else if !validUsernameRegex.MatchString(localpart) {
return ErrUsernameInvalid
} else if localpart[0] == '_' { // Regex checks its not a zero length string
return ErrUsernameUnderscore
}
return nil
}
// UsernameResponse returns a util.JSONResponse for the given error, if any.
func UsernameResponse(err error) *util.JSONResponse {
switch err {
case ErrUsernameTooLong:
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.BadJSON(err.Error()),
}
case ErrUsernameInvalid, ErrUsernameUnderscore:
return &util.JSONResponse{
Code: http.StatusBadRequest,
JSON: spec.InvalidUsername(err.Error()),
}
}
return nil
}
// ValidateApplicationServiceUsername returns an error if the username is invalid for an application service
func ValidateApplicationServiceUsername(localpart string, domain spec.ServerName) error {
if id := fmt.Sprintf("@%s:%s", localpart, domain); len(id) > maxUsernameLength {
return ErrUsernameTooLong
} else if !validUsernameRegex.MatchString(localpart) {
return ErrUsernameInvalid
}
return nil
}
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