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KeyDownloader.kt
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KeyDownloader.kt
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/*
* Copyright 2019 Vladimir Sitnikov <sitnikov.vladimir@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.github.vlsi.gradle.checksum.pgp
import com.github.vlsi.gradle.checksum.debug
import java.net.InetAddress
import java.net.URI
import java.time.Duration
import okhttp3.Dns
import okhttp3.OkHttpClient
import okhttp3.Request
import org.gradle.api.logging.Logging
private val logger = Logging.getLogger(KeyDownloader::class.java)
data class Timeouts(
val connectTimeout: Duration = Duration.ofSeconds(5),
val readTimeout: Duration = Duration.ofSeconds(10)
)
data class SingleHostDns(val host: String, val inetAddress: InetAddress) : Dns {
override fun lookup(hostname: String): List<InetAddress> =
if (hostname == host) listOf(inetAddress) else listOf()
}
class KeyDownloader(
val retry: Retry = Retry(),
val timeouts: Timeouts = Timeouts()
) {
private val client =
OkHttpClient.Builder()
.connectTimeout(timeouts.connectTimeout)
.readTimeout(timeouts.readTimeout)
.build()
private val URI.prepare: URI get() =
URI(
when (scheme) {
"hkp", "http" -> "http"
else -> "https"
},
userInfo, host,
if (port == -1 && scheme == "hkp") 11371 else port,
path, query, fragment
)
// Sample URL: https://keyserver.ubuntu.com/pks/lookup?op=vindex&fingerprint=on&search=0xbcf4173966770193
private fun URI.retrieveKeyUri(keyId: PgpKeyId, inetAddress: InetAddress) =
URI(
scheme, userInfo, host, port, "/pks/lookup",
"op=get&options=mr&search=0x$keyId", null
)
fun findKey(keyId: PgpKeyId, comment: String): ByteArray? =
retry("Downloading key $keyId for $comment") {
val url = uri.prepare.retrieveKeyUri(keyId, inetAddress)
.toURL()
logger.debug { "Downloading PGP key $keyId from $inetAddress, url: $url" }
val request = Request.Builder()
.url(url)
.build()
val newClient = client.newBuilder()
.dns(SingleHostDns(url.host, inetAddress))
.connectTimeout(Duration.ofMillis(maxTimeout.coerceAtMost(timeouts.connectTimeout.toMillis())))
.readTimeout(Duration.ofMillis(maxTimeout.coerceAtMost(timeouts.readTimeout.toMillis())))
.build()
newClient
.newCall(request).execute().use { response ->
val code = response.code
latency = response.receivedResponseAtMillis - response.sentRequestAtMillis
if (!response.isSuccessful) {
retry("Keyserver should respond with successful HTTP codes (200..300), actual code is $code, url: $url", code)
}
val body = response.body ?: retry("Empty response body for url: $url", code)
body.bytes()
}
}
}