119 lines
3.9 KiB
Swift
119 lines
3.9 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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struct PasswordValidatorError: LocalizedError {
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/// Unmet rules
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let unmetRules: [PasswordValidatorRule]
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/// Error description for the error
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var errorDescription: String? {
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var result = VectorL10n.passwordValidationErrorHeader + "\n"
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result += unmetRules.map { $0.descriptionInList }.joined(separator: "\n")
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return result
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}
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}
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/// Validation rule for a password
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enum PasswordValidatorRule: CustomStringConvertible, Hashable {
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case minLength(_ value: Int)
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case maxLength(_ value: Int)
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case containLowercaseLetter
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case containUppercaseLetter
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case containNumber
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case containSymbol
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var description: String {
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switch self {
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case .minLength(let value):
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return VectorL10n.passwordValidationErrorMinLength(value)
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case .maxLength(let value):
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return VectorL10n.passwordValidationErrorMaxLength(value)
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case .containLowercaseLetter:
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return VectorL10n.passwordValidationErrorContainLowercaseLetter
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case .containUppercaseLetter:
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return VectorL10n.passwordValidationErrorContainUppercaseLetter
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case .containNumber:
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return VectorL10n.passwordValidationErrorContainNumber
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case .containSymbol:
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return VectorL10n.passwordValidationErrorContainSymbol
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}
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}
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var descriptionInList: String {
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return "• " + description
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}
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func metBy(password: String) -> Bool {
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switch self {
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case .minLength(let value):
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return password.count >= value
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case .maxLength(let value):
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return password.count <= value
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case .containLowercaseLetter:
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return password.range(of: "[a-z]", options: .regularExpression) != nil
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case .containUppercaseLetter:
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return password.range(of: "[A-Z]", options: .regularExpression) != nil
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case .containNumber:
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return password.range(of: "[0-9]", options: .regularExpression) != nil
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case .containSymbol:
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return password.range(of: "[!\"#$%&'()*+,-.:;<=>?@\\_`{|}~\\[\\]]",
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options: .regularExpression) != nil
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}
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}
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}
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/// A utility class to validate a password against some rules.
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class PasswordValidator {
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/// Validation rules
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let rules: [PasswordValidatorRule]
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/// Initializer
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/// - Parameter rules: validation rules
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init(withRules rules: [PasswordValidatorRule]) {
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self.rules = rules
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}
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/// Validate a given password.
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/// - Parameter password: Password to be validated
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func validate(password: String) throws {
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var unmetRules: [PasswordValidatorRule] = []
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for rule in rules {
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if !rule.metBy(password: password) {
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unmetRules.append(rule)
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}
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}
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if !unmetRules.isEmpty {
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throw PasswordValidatorError(unmetRules: unmetRules)
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}
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}
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/// Creates a description text with current rules
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/// - Parameter header: Header text to include in the result
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/// - Returns: Description text containing `header` and rules
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func description(with header: String) -> String {
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var result = header
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if !rules.isEmpty {
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result += "\n"
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}
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result += rules.map { $0.descriptionInList }.joined(separator: "\n")
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return result
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}
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}
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