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ContentSecurityPolicyHandler.java
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ContentSecurityPolicyHandler.java
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package com.stubbornjava.undertow.handlers;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import io.undertow.server.HttpHandler;
import io.undertow.server.handlers.SetHeaderHandler;
public class ContentSecurityPolicyHandler {
private static final String CSP_HEADER = "Content-Security-Policy";
public enum ContentSecurityPolicy {
NONE("'none'"), // blocks the use of this type of resource.
SELF("'self'"), // matches the current origin (but not subdomains).
UNSAFE_INLINE("'unsafe-inline'"), // allows the use of inline JS and CSS.
UNSAFE_EVAL("'unsafe-eval'"), // allows the use of mechanisms like eval().
;
private final String value;
ContentSecurityPolicy(String value) {
this.value = value;
}
public String getValue() {
return value;
}
}
// https://scotthelme.co.uk/content-security-policy-an-introduction/#whatcanweprotect
public static class Builder {
private final Map<String, String> policyMap;
public Builder() {
this.policyMap = new HashMap<>();
}
public Builder defaultSrc(ContentSecurityPolicy policy) {
policyMap.put("default-src", policy.getValue());
return this;
}
public Builder defaultSrc(String... policies) {
policyMap.put("default-src", join(policies));
return this;
}
public Builder scriptSrc(ContentSecurityPolicy policy) {
policyMap.put("script-src", policy.getValue());
return this;
}
public Builder scriptSrc(String... policies) {
policyMap.put("script-src", join(policies));
return this;
}
public Builder objectSrc(ContentSecurityPolicy policy) {
policyMap.put("object-src", policy.getValue());
return this;
}
public Builder objectSrc(String... policies) {
policyMap.put("object-src", join(policies));
return this;
}
public Builder styleSrc(ContentSecurityPolicy policy) {
policyMap.put("style-src", policy.getValue());
return this;
}
public Builder styleSrc(String... policies) {
policyMap.put("style-src", join(policies));
return this;
}
public Builder imgSrc(ContentSecurityPolicy policy) {
policyMap.put("img-src", policy.getValue());
return this;
}
public Builder imgSrc(String... policies) {
policyMap.put("img-src", join(policies));
return this;
}
public Builder mediaSrc(ContentSecurityPolicy policy) {
policyMap.put("media-src", policy.getValue());
return this;
}
public Builder mediaSrc(String... policies) {
policyMap.put("media-src", join(policies));
return this;
}
public Builder frameSrc(ContentSecurityPolicy policy) {
policyMap.put("frame-src", policy.getValue());
return this;
}
public Builder frameSrc(String... policies) {
policyMap.put("frame-src", join(policies));
return this;
}
public Builder fontSrc(ContentSecurityPolicy policy) {
policyMap.put("font-src", policy.getValue());
return this;
}
public Builder fontSrc(String... policies) {
policyMap.put("font-src", join(policies));
return this;
}
public Builder connectSrc(ContentSecurityPolicy policy) {
policyMap.put("connect-src", policy.getValue());
return this;
}
public Builder connectSrc(String... policies) {
policyMap.put("connect-src", join(policies));
return this;
}
public Builder formAction(ContentSecurityPolicy policy) {
policyMap.put("form-action", policy.getValue());
return this;
}
public Builder formAction(String... policies) {
policyMap.put("form-action", join(policies));
return this;
}
public Builder sandbox(ContentSecurityPolicy policy) {
policyMap.put("sandbox", policy.getValue());
return this;
}
public Builder sandbox(String... policies) {
policyMap.put("sandbox", join(policies));
return this;
}
public Builder scriptNonce(ContentSecurityPolicy policy) {
policyMap.put("script-nonce", policy.getValue());
return this;
}
public Builder scriptNonce(String... policies) {
policyMap.put("script-nonce", join(policies));
return this;
}
public Builder pluginTypes(ContentSecurityPolicy policy) {
policyMap.put("plugin-types", policy.getValue());
return this;
}
public Builder pluginTypes(String... policies) {
policyMap.put("plugin-types", join(policies));
return this;
}
public Builder reflectedXss(ContentSecurityPolicy policy) {
policyMap.put("reflected-xss", policy.getValue());
return this;
}
public Builder reflectedXss(String... policies) {
policyMap.put("reflected-xss", join(policies));
return this;
}
public Builder reportUri(String uri) {
policyMap.put("report-uri", uri);
return this;
}
public HttpHandler build(HttpHandler delegate) {
String policy = policyMap.entrySet()
.stream()
.map(entry -> entry.getKey() + " " + entry.getValue())
.collect(Collectors.joining("; "));
return new SetHeaderHandler(delegate, CSP_HEADER, policy);
}
private String join(String... strings) {
return Stream.of(strings).collect(Collectors.joining(" "));
}
}
}