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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.http.filter.security.cors;
import com.google.common.collect.ImmutableMap;
import com.yahoo.jdisc.HeaderFields;
import com.yahoo.jdisc.Response;
import java.time.Duration;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
/**
* @author bjorncs
*/
class CorsLogic {
private CorsLogic() {}
static final String CORS_PREFLIGHT_REQUEST_CACHE_TTL = Long.toString(Duration.ofDays(7).getSeconds());
static final String ALLOW_ORIGIN_HEADER = "Access-Control-Allow-Origin";
static final Map<String, String> ACCESS_CONTROL_HEADERS = ImmutableMap.of(
"Access-Control-Max-Age", CORS_PREFLIGHT_REQUEST_CACHE_TTL,
"Access-Control-Allow-Headers", "Origin,Content-Type,Accept,Yahoo-Principal-Auth",
"Access-Control-Allow-Methods", "OPTIONS,GET,PUT,DELETE,POST",
"Access-Control-Allow-Credentials", "true"
);
static Map<String, String> createCorsResponseHeaders(String requestOriginHeader,
Set<String> allowedOrigins) {
if (requestOriginHeader == null) return Collections.emptyMap();
TreeMap<String, String> headers = new TreeMap<>();
allowedOrigins.stream()
.filter(allowedUrl -> matchesRequestOrigin(requestOriginHeader, allowedUrl))
.findAny()
.ifPresent(allowedOrigin -> headers.put(ALLOW_ORIGIN_HEADER, allowedOrigin));
ACCESS_CONTROL_HEADERS.forEach(headers::put);
return headers;
}
static Map<String, String> createCorsPreflightResponseHeaders(String requestOriginHeader,
Set<String> allowedOrigins) {
TreeMap<String, String> headers = new TreeMap<>();
if (allowedOrigins.contains(requestOriginHeader))
headers.put(ALLOW_ORIGIN_HEADER, requestOriginHeader);
ACCESS_CONTROL_HEADERS.forEach(headers::put);
return headers;
}
private static boolean matchesRequestOrigin(String requestOrigin, String allowedUrl) {
return allowedUrl.equals("*") || requestOrigin.startsWith(allowedUrl);
}
}
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