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/*
* Copyright © 2014-2020 The Android Password Store Authors. All Rights Reserved.
* SPDX-License-Identifier: GPL-3.0-only
*/
package com.zeapo.pwdstore
import android.net.Uri
import java.io.ByteArrayOutputStream
import java.io.UnsupportedEncodingException
/**
* A single entry in password store.
*/
class PasswordEntry(private val content: String) {
val password: String
val username: String?
val digits: String
val totpSecret: String?
val totpPeriod: Long
val totpAlgorithm: String
val hotpSecret: String?
val hotpCounter: Long?
var extraContent: String
private set
private var isIncremented = false
@Throws(UnsupportedEncodingException::class)
constructor(os: ByteArrayOutputStream) : this(os.toString("UTF-8"))
init {
val passContent = content.split("\n".toRegex(), 2).toTypedArray()
password = passContent[0]
digits = findOtpDigits(content)
totpSecret = findTotpSecret(content)
totpPeriod = findTotpPeriod(content)
totpAlgorithm = findTotpAlgorithm(content)
hotpSecret = findHotpSecret(content)
hotpCounter = findHotpCounter(content)
extraContent = findExtraContent(passContent)
username = findUsername()
}
fun hasExtraContent(): Boolean {
return extraContent.isNotEmpty()
}
fun hasUsername(): Boolean {
return username != null
}
fun hasTotp(): Boolean {
return totpSecret != null
}
fun hasHotp(): Boolean {
return hotpSecret != null && hotpCounter != null
}
fun hotpIsIncremented(): Boolean {
return isIncremented
}
fun incrementHotp() {
content.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://hotp/")) {
extraContent = extraContent.replaceFirst("counter=[0-9]+".toRegex(), "counter=${hotpCounter!! + 1}")
isIncremented = true
}
}
}
val extraContentWithoutUsername by lazy {
var usernameFound = false
extraContent.splitToSequence("\n").filter { line ->
if (usernameFound)
return@filter true
if (USERNAME_FIELDS.any { prefix -> line.startsWith(prefix, ignoreCase = true) }) {
usernameFound = true
return@filter false
}
true
}.joinToString(separator = "\n")
}
private fun findUsername(): String? {
extraContent.splitToSequence("\n").forEach { line ->
for (prefix in USERNAME_FIELDS) {
if (line.startsWith(prefix, ignoreCase = true))
return line.substring(prefix.length).trimStart()
}
}
return null
}
private fun findTotpSecret(decryptedContent: String): String? {
decryptedContent.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://totp/")) {
return Uri.parse(line).getQueryParameter("secret")
}
if (line.startsWith("totp:", ignoreCase = true)) {
return line.split(": *".toRegex(), 2).toTypedArray()[1]
}
}
return null
}
private fun findOtpDigits(decryptedContent: String): String {
decryptedContent.split("\n".toRegex()).forEach { line ->
if ((line.startsWith("otpauth://totp/") ||
line.startsWith("otpauth://hotp/")) &&
Uri.parse(line).getQueryParameter("digits") != null) {
return Uri.parse(line).getQueryParameter("digits")!!
}
}
return "6"
}
private fun findTotpPeriod(decryptedContent: String): Long {
decryptedContent.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://totp/") &&
Uri.parse(line).getQueryParameter("period") != null) {
return java.lang.Long.parseLong(Uri.parse(line).getQueryParameter("period")!!)
}
}
return 30
}
private fun findTotpAlgorithm(decryptedContent: String): String {
decryptedContent.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://totp/") &&
Uri.parse(line).getQueryParameter("algorithm") != null) {
return Uri.parse(line).getQueryParameter("algorithm")!!
}
}
return "sha1"
}
private fun findHotpSecret(decryptedContent: String): String? {
decryptedContent.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://hotp/")) {
return Uri.parse(line).getQueryParameter("secret")
}
}
return null
}
private fun findHotpCounter(decryptedContent: String): Long? {
decryptedContent.split("\n".toRegex()).forEach { line ->
if (line.startsWith("otpauth://hotp/")) {
return java.lang.Long.parseLong(Uri.parse(line).getQueryParameter("counter")!!)
}
}
return null
}
private fun findExtraContent(passContent: Array<String>): String {
val extraContent = if (passContent.size > 1) passContent[1] else ""
// if there is a HOTP URI, we must return the extra content with the counter incremented
return if (hasHotp()) {
extraContent.replaceFirst("counter=[0-9]+".toRegex(), "counter=" + (hotpCounter!!).toString())
} else extraContent
}
companion object {
val USERNAME_FIELDS = arrayOf(
"login:",
"username:",
"user:",
"account:",
"email:",
"name:",
"handle:",
"id:",
"identity:"
)
}
}
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