Swap to a new backend yet again

mobile/src/main/java/be/mygod/vpnhotspot/client/MacLookup.kt

@@ -9,21 +9,17 @@ import be.mygod.vpnhotspot.room.AppDatabase
 import be.mygod.vpnhotspot.util.connectCancellable
 import be.mygod.vpnhotspot.widget.SmartSnackbar
 import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.CoroutineStart
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.sync.Mutex
-import kotlinx.coroutines.sync.withLock
 import org.json.JSONException
 import org.json.JSONObject
 import timber.log.Timber
-import java.io.File
-import java.io.FileNotFoundException
 import java.io.IOException
-import java.net.HttpCookie
+import java.math.BigInteger
-import java.util.Scanner
+import java.security.MessageDigest
-import java.util.regex.Pattern
 
 /**
  * This class generates a default nickname for new clients.
@@ -37,43 +33,7 @@ object MacLookup {
         override fun getLocalizedMessage() = formatMessage(app)
     }
 
-    private object SessionManager {
+    private val sha1 = MessageDigest.getInstance("SHA-1")
-        private const val CACHE_FILENAME = "maclookup_sessioncache"
-        private const val COOKIE_SESSION = "mac_address_vendor_lookup_session"
-        private val csrfPattern = Pattern.compile("<meta\\s+name=\"csrf-token\"\\s+content=\"([^\"]*)\"",
-            Pattern.CASE_INSENSITIVE)
-        private var sessionCache: List<String>?
-            get() = try {
-                File(app.deviceStorage.cacheDir, CACHE_FILENAME).readText().split('\n', limit = 2)
-            } catch (_: FileNotFoundException) {
-                null
-            }
-            set(value) = File(app.deviceStorage.cacheDir, CACHE_FILENAME).run {
-                if (value != null) writeText(value.joinToString("\n")) else if (!delete()) writeText("")
-            }
-        private val mutex = Mutex()
-
-        private suspend fun refreshSessionCache() = connectCancellable("https://macaddress.io/api") { conn ->
-            val cookies = conn.headerFields["set-cookie"] ?: throw IOException("Missing cookies")
-            var mavls: HttpCookie? = null
-            for (header in cookies) for (cookie in HttpCookie.parse(header)) {
-                if (cookie.name == COOKIE_SESSION) mavls = cookie
-            }
-            if (mavls == null) throw IOException("Missing set-cookie $COOKIE_SESSION")
-            val token = conn.inputStream.use { Scanner(it).findWithinHorizon(csrfPattern, 0) }
-                ?: throw IOException("Missing csrf-token")
-            listOf(mavls.toString(), csrfPattern.matcher(token).run {
-                check(matches())
-                group(1)!!
-            }).also { sessionCache = it }
-        }
-
-        suspend fun obtain(forceNew: Boolean): Pair<HttpCookie, String> = mutex.withLock {
-            val sessionCache = (if (forceNew) null else sessionCache) ?: refreshSessionCache()
-            HttpCookie.parse(sessionCache[0]).single() to sessionCache[1]
-        }
-    }
-
     private val macLookupBusy = mutableMapOf<MacAddress, Job>()
     // http://en.wikipedia.org/wiki/ISO_3166-1
     private val countryCodeRegex = "(?:^|[^A-Z])([A-Z]{2})[\\s\\d]*$".toRegex()
@@ -84,31 +44,29 @@ object MacLookup {
     @MainThread
     fun perform(mac: MacAddress, explicit: Boolean = false) {
         abort(mac)
-        macLookupBusy[mac] = GlobalScope.launch(Dispatchers.IO) {
+        macLookupBusy[mac] = GlobalScope.launch(Dispatchers.Unconfined, CoroutineStart.UNDISPATCHED) {
+            var response: String? = null
             try {
-                var response: String? = null
+                response = connectCancellable("https://api.maclookup.app/v2/macs/$mac") { conn ->
-                for (tries in 0 until 5) {
+//                    conn.setRequestProperty("X-App-Id", "net.mobizme.macaddress")
-                    val (cookie, csrf) = SessionManager.obtain(tries > 0)
+//                    conn.setRequestProperty("X-App-Version", "2.0.11")
-                    response = connectCancellable("https://macaddress.io/mac-address-lookup") { conn ->
+//                    conn.setRequestProperty("X-App-Version-Code", "111")
-                        conn.requestMethod = "POST"
+                    val epoch = System.currentTimeMillis()
-                        conn.setRequestProperty("content-type", "application/json")
+                    conn.setRequestProperty("X-App-Epoch", epoch.toString())
-                        conn.setRequestProperty("cookie", "${cookie.name}=${cookie.value}")
+                    conn.setRequestProperty("X-App-Sign", "%032x".format(BigInteger(1,
-                        conn.setRequestProperty("x-csrf-token", csrf)
+                        sha1.digest("aBA6AEkfg8cbHlWrBDYX_${mac}_$epoch".toByteArray()))))
-                        conn.outputStream.writer().use { it.write("{\"macAddress\":\"$mac\",\"not-web-search\":true}") }
+                    when (val responseCode = conn.responseCode) {
-                        when (val responseCode = conn.responseCode) {
+                        200 -> conn.inputStream.bufferedReader().readText()
-                            200 -> conn.inputStream.bufferedReader().readText()
+                        400, 401, 429 -> throw UnexpectedError(mac, conn.inputStream.bufferedReader().readText())
-                            419 -> null
+                        else -> throw UnexpectedError(mac, "Unhandled response code $responseCode: " +
-                            else -> throw IOException("Unhandled response code $responseCode")
+                                conn.inputStream.bufferedReader().readText())
-                        }
                     }
-                    if (response != null) break
                 }
-                if (response == null) throw IOException("Session creation failure")
                 val obj = JSONObject(response)
-                val result = if (obj.getJSONObject("blockDetails").getBoolean("blockFound")) {
+                if (!obj.getBoolean("success")) throw UnexpectedError(mac, response)
-                    val vendor = obj.getJSONObject("vendorDetails")
+                val result = if (obj.getBoolean("found")) {
-                    val company = vendor.getString("companyName")
+                    val company = obj.getString("company")
-                    val match = extractCountry(mac, response, vendor)
+                    val match = extractCountry(mac, response, obj)
                     if (match != null) {
                         String(match.groupValues[1].flatMap { listOf('\uD83C', it + 0xDDA5) }.toCharArray()) + ' ' +
                                 company
@@ -120,15 +78,19 @@ object MacLookup {
                 }
             } catch (_: CancellationException) {
             } catch (e: Throwable) {
-                Timber.w(e)
+                when (e) {
+                    is UnexpectedError -> Timber.w(e)
+                    is IOException -> Timber.d(e)
+                    else -> Timber.w(UnexpectedError(mac, "Got response: $response").initCause(e))
+                }
                 if (explicit) SmartSnackbar.make(e).show()
             }
         }
     }
 
     private fun extractCountry(mac: MacAddress, response: String, obj: JSONObject): MatchResult? {
-        countryCodeRegex.matchEntire(obj.optString("countryCode"))?.also { return it }
+        countryCodeRegex.matchEntire(obj.optString("country"))?.also { return it }
-        val address = obj.optString("companyAddress")
+        val address = obj.optString("address")
         if (address.isBlank()) return null
         countryCodeRegex.find(address)?.also { return it }
         Timber.w(UnexpectedError(mac, response))