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/*
* This file is part of LibEuFin.
* Copyright (C) 2024 Taler Systems S.A.
* LibEuFin is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation; either version 3, or
* (at your option) any later version.
* LibEuFin is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General
* Public License for more details.
* You should have received a copy of the GNU Affero General Public
* License along with LibEuFin; see the file COPYING. If not, see
* <http://www.gnu.org/licenses/>
*/
package tech.libeufin.common
import io.ktor.http.*
import io.ktor.server.application.*
import io.ktor.server.request.*
import io.ktor.server.util.*
import org.slf4j.Logger
import org.slf4j.LoggerFactory
private val logger: Logger = LoggerFactory.getLogger("libeufin-common")
// Get the base URL of a request, returns null if any problem occurs.
fun ApplicationRequest.getBaseUrl(): String? {
return if (this.headers.contains("X-Forwarded-Host")) {
logger.info("Building X-Forwarded- base URL")
// FIXME: should tolerate a missing X-Forwarded-Prefix.
var prefix: String = this.headers["X-Forwarded-Prefix"]
?: run {
logger.error("Reverse proxy did not define X-Forwarded-Prefix")
return null
}
if (!prefix.endsWith("/"))
prefix += "/"
URLBuilder(
protocol = URLProtocol(
name = this.headers["X-Forwarded-Proto"] ?: run {
logger.error("Reverse proxy did not define X-Forwarded-Proto")
return null
},
defaultPort = -1 // Port must be specified with X-Forwarded-Host.
),
host = this.headers["X-Forwarded-Host"] ?: run {
logger.error("Reverse proxy did not define X-Forwarded-Host")
return null
}
).apply {
encodedPath = prefix
// Gets dropped otherwise.
if (!encodedPath.endsWith("/"))
encodedPath += "/"
}.buildString()
} else {
this.call.url {
parameters.clear()
encodedPath = "/"
}
}
}
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