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// Copyright Yahoo. 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 java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.regex.Pattern;
/**
* @author bjorncs
*/
class 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 = Map.of(
"Access-Control-Max-Age", CORS_PREFLIGHT_REQUEST_CACHE_TTL,
"Access-Control-Allow-Headers", "Origin,Content-Type,Accept,Yahoo-Principal-Auth,Okta-Identity-Token," +
"Okta-Access-Token,Okta-Refresh-Token,Vespa-Csrf-Token",
"Access-Control-Allow-Methods", "OPTIONS,GET,PUT,DELETE,POST,PATCH",
"Access-Control-Allow-Credentials", "true",
"Vary", "*"
);
private final boolean allowAnyOrigin;
private final Set<String> allowedOrigins;
private final List<Pattern> allowedOriginPatterns;
private CorsLogic(boolean allowAnyOrigin, Set<String> allowedOrigins, List<Pattern> allowedOriginPatterns) {
this.allowAnyOrigin = allowAnyOrigin;
this.allowedOrigins = Set.copyOf(allowedOrigins);
this.allowedOriginPatterns = List.copyOf(allowedOriginPatterns);
}
boolean originMatches(String origin) {
if (allowAnyOrigin) return true;
if (allowedOrigins.contains(origin)) return true;
return allowedOriginPatterns.stream().anyMatch(pattern -> pattern.matcher(origin).matches());
}
Map<String, String> createCorsResponseHeaders(String requestOriginHeader) {
if (requestOriginHeader == null) return Map.of();
TreeMap<String, String> headers = new TreeMap<>();
if (originMatches(requestOriginHeader))
headers.put(ALLOW_ORIGIN_HEADER, requestOriginHeader);
headers.putAll(ACCESS_CONTROL_HEADERS);
return headers;
}
Map<String, String> preflightResponseHeaders(String requestOriginHeader) {
return createCorsResponseHeaders(requestOriginHeader);
}
static CorsLogic forAllowedOrigins(Collection<String> allowedOrigins) {
Set<String> allowedOriginsVerbatim = new HashSet<>();
List<Pattern> allowedOriginPatterns = new ArrayList<>();
for (String allowedOrigin : allowedOrigins) {
if (allowedOrigin.isBlank()) continue;
if (allowedOrigin.length() > 0) {
if ("*".equals(allowedOrigin))
return new CorsLogic(true, Set.of(), List.of());
else if (allowedOrigin.contains("*"))
allowedOriginPatterns.add(Pattern.compile(allowedOrigin.replace(".", "\\.").replace("*", ".*")));
else
allowedOriginsVerbatim.add(allowedOrigin);
}
}
return new CorsLogic(false, allowedOriginsVerbatim, allowedOriginPatterns);
}
}
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