This is a kotlin implementation of a persistent cookie store for android, using SharedPreferences and Gson for the actual persistence

PersistentCookieStore.kt

internal class PersistentCookieStore(val context: Context) : CookieStore {

    inner class DatedCookie(val cookie: HttpCookie, val creationDate: Date)

    val SP_COOKIE_STORE = "cookieStore"
    val SP_KEY_DELIMITER = "|"
    val SP_KEY_DELIMITER_REGEX = "\\" + SP_KEY_DELIMITER

    val cookieSharedPreferences = context.getSharedPreferences(SP_COOKIE_STORE, Context.MODE_PRIVATE)
    val allCookies: MutableMap<URI, MutableSet<DatedCookie>> = mutableMapOf()

    init {
         cookieSharedPreferences.all.entries.map {
             val uriAndName = it.key.split(Regex(SP_KEY_DELIMITER_REGEX), 2)
             val uri = URI(uriAndName[0])
             val cookie: DatedCookie = gson.fromJson<DatedCookie?>(it.value as String)!!
             if (allCookies[uri] == null) {
                 allCookies.put(uri, mutableSetOf())
             }
             allCookies[uri]?.add(cookie)
         }
    }

    fun getValidCookies(uri: URI) : List<HttpCookie>  {
        return allCookies.keys.filter {
            HttpCookie.domainMatches(it.host, uri.host)
            //checkDomainsMatch(it.host, uri.host)
                    &&  checkPathsMatch(it.path, uri.path)
        } .flatMap {
            // clean expired cookies
            allCookies[it].orEmpty().filter { it.cookie.maxAge > 0 && Date().time > it.creationDate.time + (it.cookie.maxAge * 1000) }
                    .forEach {
                        remove(uri, it.cookie)
                    }
            allCookies[it].orEmpty().map { it.cookie }
         }
    }

    private fun checkDomainsMatch(cookieHost: String, requestHost: String): Boolean {
        return requestHost == cookieHost || requestHost.endsWith("." + cookieHost)
    }

    private fun checkPathsMatch(cookiePath: String, requestPath: String): Boolean {
        return requestPath == cookiePath ||
                requestPath.startsWith(cookiePath) && cookiePath[cookiePath.length - 1] == '/' ||
                requestPath.startsWith(cookiePath) && requestPath.substring(cookiePath.length)[0] == '/'
    }

    @Synchronized override fun add(uri: URI, cookie: HttpCookie) {
        var uri = uri

        uri = cookie.cookieUri(uri)
        var exists = allCookies[uri]
        if (exists == null)
            allCookies[uri] = HashSet<DatedCookie>()
        val datedCookie = DatedCookie(cookie, Date())
        allCookies[uri]?.add(datedCookie)
        saveToPersistence(uri, datedCookie)
    }

    private inline fun HttpCookie.cookieUri(uri: URI): URI {
        var cookieUri = uri
        if (domain != null) {
            // Remove the starting dot character of the domain, if exists (e.g: .domain.com -> domain.com)
            var domain = domain
            if (domain[0] == '.') {
                domain = domain.substring(1)
            }
            try {
                cookieUri = URI(if (uri.scheme == null)
                    "http"
                else
                    uri.scheme, domain,
                        if (path == null) "/" else path, null)
            } catch (e: URISyntaxException) {
                Log.w(TAG, e)
            }

        }
        return cookieUri
    }

    private fun saveToPersistence(uri: URI, cookie: DatedCookie) {
        val editor = cookieSharedPreferences.edit()
        editor.putString(uri.toString() + SP_KEY_DELIMITER + cookie.cookie.name,gson.toJson(cookie))
        editor.apply()
    }


    @Synchronized override fun remove(uri: URI, cookie: HttpCookie): Boolean {
        val targetCookies = allCookies[uri]
        val cookieRemoved = targetCookies != null && targetCookies.remove(targetCookies.find{ it.cookie == cookie })
        if (cookieRemoved) {
            removeFromPersistence(uri, cookie)
        }
        return cookieRemoved

    }

    private fun removeFromPersistence(uri: URI, cookieToRemove: HttpCookie) {
        val editor = cookieSharedPreferences.edit()
        editor.remove(uri.toString() + SP_KEY_DELIMITER
                + cookieToRemove.name)
        editor.apply()
    }


    override fun removeAll(): Boolean {
        allCookies.clear()
        cookieSharedPreferences.edit().clear().apply()
        return true
    }

    override fun get(uri: URI?): MutableList<HttpCookie>? = getValidCookies(uri!!).toMutableList()
    override fun getURIs(): MutableList<URI>? = allCookies.keys.toMutableList()
    override fun getCookies(): MutableList<HttpCookie>? = allCookies.keys.flatMap { getValidCookies(it) }.toMutableList()
}

Hello! I'm new on app development, I'm using your class however it gives me an error on line 17, asking me for a second argument on gson.fromJson<DatedCookie?>(it.value as String)!!, do you know what can it be?

@Dmb-999 pass in DatedCookie::class.java

Hello, how do you access this cookie storage after the plugin HttpCookies has been installed onto the client? I would like to addCookie() after the client has been initialized.

Thank you