Improve M_LIMIT_EXCEEDED error rendering

matrix-sdk-android/src/main/java/im/vector/matrix/android/api/failure/MatrixError.kt

@@ -31,7 +31,9 @@ data class MatrixError(
         @Json(name = "consent_uri") val consentUri: String? = null,
         // RESOURCE_LIMIT_EXCEEDED data
         @Json(name = "limit_type") val limitType: String? = null,
-        @Json(name = "admin_contact") val adminUri: String? = null) {
+        @Json(name = "admin_contact") val adminUri: String? = null,
+        // For LIMIT_EXCEEDED
+        @Json(name = "retry_after_ms") val retryAfterMillis: Long? = null) {
 
     companion object {
         const val FORBIDDEN = "M_FORBIDDEN"

vector/src/main/java/im/vector/riotx/core/error/ErrorFormatter.kt

@@ -65,7 +65,7 @@ class ErrorFormatter @Inject constructor(private val stringProvider: StringProvi
                         stringProvider.getString(R.string.login_error_not_json)
                     }
                     throwable.error.code == MatrixError.LIMIT_EXCEEDED       -> {
-                        stringProvider.getString(R.string.login_error_limit_exceeded)
+                        limitExceededError(throwable.error)
                     }
                     throwable.error.code == MatrixError.THREEPID_NOT_FOUND   -> {
                         stringProvider.getString(R.string.login_reset_password_error_not_found)
@@ -80,4 +80,16 @@ class ErrorFormatter @Inject constructor(private val stringProvider: StringProvi
         }
                 ?: stringProvider.getString(R.string.unknown_error)
     }
+
+    private fun limitExceededError(error: MatrixError): String {
+        val delay = error.retryAfterMillis
+
+        return if (delay == null) {
+            stringProvider.getString(R.string.login_error_limit_exceeded)
+        } else {
+            // Ensure at least 1 second
+            val delaySeconds = delay.toInt() / 1000 + 1
+            stringProvider.getQuantityString(R.plurals.login_error_limit_exceeded_retry_after, delaySeconds, delaySeconds)
+        }
+    }
 }

vector/src/main/res/values/strings_riotX.xml

@@ -128,4 +128,9 @@
     <string name="login_wait_for_email_notice">We just sent an email to %1$s.\nPlease click on the link it contains to continue the account creation.</string>
     <string name="login_validation_code_is_not_correct">The entered code is not correct. Please check.</string>
 
+    <plurals name="login_error_limit_exceeded_retry_after">
+        <item quantity="one">Too many requests have been sent. You can retry in %1$d second…</item>
+        <item quantity="other">Too many requests have been sent. You can retry in %1$d seconds…</item>
+    </plurals>
+
 </resources>