71 lines
2.5 KiB
Kotlin
71 lines
2.5 KiB
Kotlin
/*
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* Copyright (c) 2021 Proton Technologies AG
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* This file is part of Proton Technologies AG and ProtonCore.
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*
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* ProtonCore is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* ProtonCore is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with ProtonCore. If not, see <https://www.gnu.org/licenses/>.
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*/
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package me.proton.core.network.data.interceptor
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import me.proton.core.network.domain.ApiResult
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import me.proton.core.network.domain.session.SessionId
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import okhttp3.Interceptor
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import okhttp3.Response
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import org.jetbrains.annotations.TestOnly
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class TooManyRequestInterceptor(
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private val sessionId: SessionId?,
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private val wallClockMs: () -> Long
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) : Interceptor {
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private fun nowSeconds() = wallClockMs().div(1000).toInt()
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data class BlockedRequest(
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val response: Response,
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val timestampSeconds: Int,
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val retryAfterSeconds: Int
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)
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override fun intercept(chain: Interceptor.Chain): Response {
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val request = chain.request()
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// Check if this route for this session is blocked.
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val key = "${sessionId?.id}:${request.url.encodedPath}"
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blockedRequestMap[key]?.let { banned ->
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val elapsedDeltaSeconds = nowSeconds() - banned.timestampSeconds
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if (elapsedDeltaSeconds < banned.retryAfterSeconds) {
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return banned.response.newBuilder()
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.header("Retry-After", "${banned.retryAfterSeconds - elapsedDeltaSeconds}")
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.build()
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} else {
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blockedRequestMap.remove(key)
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}
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}
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val response = chain.proceed(request)
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if (response.code == ApiResult.HTTP_TOO_MANY_REQUESTS) {
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val retryAfter = response.headers["Retry-After"]?.toIntOrNull() ?: 0
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blockedRequestMap[key] = BlockedRequest(response, nowSeconds(), retryAfter)
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}
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return response
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}
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companion object {
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private val blockedRequestMap = mutableMapOf<String, BlockedRequest>()
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@TestOnly
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fun reset() = blockedRequestMap.clear()
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}
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}
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