Merge branch 'master' into 1.0.0

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/Crypto.kt

@@ -0,0 +1,19 @@
+package dev.inmo.tgbotapi.utils
+
+import dev.inmo.micro_utils.crypto.SourceBytes
+import dev.inmo.micro_utils.crypto.SourceString
+
+internal expect fun SourceString.hmacSha256(key: String): String
+private val HEX_ARRAY = "0123456789abcdef".toCharArray()
+
+internal fun SourceBytes.hex(): String {
+    val hexChars = CharArray(size * 2)
+    for (j in indices) {
+        val v: Int = this[j].toInt() and 0xFF
+        hexChars[j * 2] = HEX_ARRAY[v ushr 4]
+        hexChars[j * 2 + 1] = HEX_ARRAY[v and 0x0F]
+    }
+    return hexChars.concatToString()
+}
+
+internal fun SourceString.hex(): String = encodeToByteArray().hex()

tgbotapi.core/src/commonMain/kotlin/dev/inmo/tgbotapi/utils/TelegramAPIUrlsKeeper.kt

@@ -18,6 +18,10 @@ class TelegramAPIUrlsKeeper(
     token: String,
     hostUrl: String = telegramBotAPIDefaultUrl
 ) {
+    val webAppDataSecretKey by lazy {
+        token.hmacSha256("WebAppData")
+    }
+
     val commonAPIUrl: String
     val fileBaseUrl: String
 
@@ -28,4 +32,10 @@ class TelegramAPIUrlsKeeper(
     }
 
     fun createFileLinkUrl(filePath: String) = "${fileBaseUrl}/$filePath"
+
+    /**
+     * @param rawData Data from [dev.inmo.tgbotapi.webapps.WebApp.initData]
+     * @param hash Data from [dev.inmo.tgbotapi.webapps.WebApp.initDataUnsafe] from the field [dev.inmo.tgbotapi.webapps.WebAppInitData.hash]
+     */
+    fun checkWebAppLink(rawData: String, hash: String) = rawData.hmacSha256(webAppDataSecretKey).hex() == hash
 }