package com.dsh.privacy;
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import org.springframework.core.MethodParameter;
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import org.springframework.http.MediaType;
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import org.springframework.http.converter.HttpMessageConverter;
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import org.springframework.web.bind.annotation.ControllerAdvice;
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import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
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import javax.servlet.http.HttpServletRequest;
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import java.lang.reflect.Array;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.nio.file.Path;
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import java.util.IdentityHashMap;
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import java.util.Iterator;
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import java.util.Map;
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/** Ensures every normal management JSON response uses the same privacy rules. */
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@ControllerAdvice
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public class SensitiveDataMaskingAdvice implements ResponseBodyAdvice<Object> {
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private final HttpServletRequest request;
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public SensitiveDataMaskingAdvice(HttpServletRequest request) { this.request = request; }
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@Override public boolean supports(MethodParameter type, Class<? extends HttpMessageConverter<?>> converter) {
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// Only the explicit, admin-only and audited endpoint returns the source value.
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return !request.getRequestURI().startsWith("/system/sensitive/");
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}
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@Override public Object beforeBodyWrite(Object body, MethodParameter type, MediaType mediaType,
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Class<? extends HttpMessageConverter<?>> converter, org.springframework.http.server.ServerHttpRequest req,
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org.springframework.http.server.ServerHttpResponse response) {
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mask(body, new IdentityHashMap<Object, Boolean>()); return body;
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}
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private void mask(Object value, IdentityHashMap<Object, Boolean> seen) {
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if (value == null || value instanceof String || value.getClass().isEnum() || seen.put(value, Boolean.TRUE) != null) return;
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// Reactive streams and their internal queues are runtime infrastructure, not
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// response DTOs. In particular, Reactor's MpscLinkedQueue implements
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// Iterable but deliberately throws UnsupportedOperationException from
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// iterator(). Do not introspect it (or any other reactive infrastructure).
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if (isReactiveInfrastructure(value.getClass())) return;
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// UnixPath implements Iterable. Its iterator creates a new Path for every
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// segment, so identity-based cycle detection cannot stop the recursion.
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if (value instanceof Path) return;
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if (value instanceof Map) {
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for (Object item : ((Map<?, ?>) value).entrySet()) {
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Map.Entry entry = (Map.Entry) item; Object child = entry.getValue(); int kind = kind(String.valueOf(entry.getKey()));
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if (child instanceof String && kind != 0) entry.setValue(maskText((String) child, kind)); else mask(child, seen);
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}
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return;
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}
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if (value instanceof Iterable) {
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maskIterable((Iterable<?>) value, seen);
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return;
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}
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if (value.getClass().isArray()) { for (int i = 0; i < Array.getLength(value); i++) mask(Array.get(value, i), seen); return; }
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if (isJdkType(value.getClass())) return;
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for (Class<?> type = value.getClass(); type != null && type != Object.class; type = type.getSuperclass()) for (Field field : type.getDeclaredFields()) {
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if (Modifier.isStatic(field.getModifiers()) || field.isSynthetic()) continue;
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try { field.setAccessible(true); Object child = field.get(value); int kind = kind(field.getName());
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if (child instanceof String && kind != 0) field.set(value, maskText((String) child, kind)); else mask(child, seen);
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} catch (IllegalAccessException | RuntimeException ignored) { }
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}
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}
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/**
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* Some third-party containers expose Iterable only for API compatibility and
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* intentionally do not support iteration. A response privacy filter must never
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* turn such an implementation detail into a 500 response.
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*/
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private void maskIterable(Iterable<?> values, IdentityHashMap<Object, Boolean> seen) {
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try {
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Iterator<?> iterator = values.iterator();
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while (iterator.hasNext()) mask(iterator.next(), seen);
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} catch (UnsupportedOperationException ignored) {
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// There is no safely accessible element to mask.
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}
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}
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private boolean isReactiveInfrastructure(Class<?> type) {
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String name = type.getName();
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return name.startsWith("reactor.")
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|| name.startsWith("org.reactivestreams.")
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|| name.startsWith("io.netty.");
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}
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private boolean isJdkType(Class<?> type) {
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String name = type.getName();
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return name.startsWith("java.") || name.startsWith("javax.") || name.startsWith("sun.");
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}
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private int kind(String name) {
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String key = name == null ? "" : name.replace("_", "").replace("-", "").toLowerCase();
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if (key.equals("idcard") || key.equals("identitycard") || key.equals("identitynumber") || key.equals("idnumber")) return 2;
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return key.equals("phone") || key.equals("mobile") || key.equals("telephone") || key.equals("tel") || key.endsWith("phone") || key.endsWith("mobile") ? 1 : 0;
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}
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private String maskText(String text, int kind) {
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if (text == null) return null;
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return kind == 1 ? (text.length() <= 7 ? stars(text.length()) : text.substring(0, 3) + "****" + text.substring(7))
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: (text.length() <= 10 ? stars(text.length()) : text.substring(0, 6) + stars(text.length() - 10) + text.substring(text.length() - 4));
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}
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private String stars(int count) { StringBuilder result = new StringBuilder(); for (int i = 0; i < count; i++) result.append('*'); return result.toString(); }
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}
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