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@@ -0,0 +1,497 @@
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+package com.hz.employmentsite.util.ip;
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+
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+import java.util.*;
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+import java.util.concurrent.ConcurrentHashMap;
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+import java.util.concurrent.ConcurrentMap;
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+import java.util.regex.Matcher;
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+import java.util.regex.Pattern;
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+
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+/**
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+ * HTML过滤器，用于去除XSS漏洞隐患。
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+ *
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+ * @author ruoyi
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+ */
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+public final class HTMLFilter {
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+ /**
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+ * regex flag union representing /si modifiers in php
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+ **/
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+ private static final int REGEX_FLAGS_SI = Pattern.CASE_INSENSITIVE | Pattern.DOTALL;
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+ private static final Pattern P_COMMENTS = Pattern.compile("<!--(.*?)-->", Pattern.DOTALL);
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+ private static final Pattern P_COMMENT = Pattern.compile("^!--(.*)--$", REGEX_FLAGS_SI);
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+ private static final Pattern P_TAGS = Pattern.compile("<(.*?)>", Pattern.DOTALL);
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+ private static final Pattern P_END_TAG = Pattern.compile("^/([a-z0-9]+)", REGEX_FLAGS_SI);
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+ private static final Pattern P_START_TAG = Pattern.compile("^([a-z0-9]+)(.*?)(/?)$", REGEX_FLAGS_SI);
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+ private static final Pattern P_QUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)=([\"'])(.*?)\\2", REGEX_FLAGS_SI);
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+ private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^\"\\s']+)", REGEX_FLAGS_SI);
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+ private static final Pattern P_PROTOCOL = Pattern.compile("^([^:]+):", REGEX_FLAGS_SI);
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+ private static final Pattern P_ENTITY = Pattern.compile("&#(\\d+);?");
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+ private static final Pattern P_ENTITY_UNICODE = Pattern.compile("&#x([0-9a-f]+);?");
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+ private static final Pattern P_ENCODE = Pattern.compile("%([0-9a-f]{2});?");
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+ private static final Pattern P_VALID_ENTITIES = Pattern.compile("&([^&;]*)(?=(;|&|$))");
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+ private static final Pattern P_VALID_QUOTES = Pattern.compile("(>|^)([^<]+?)(<|$)", Pattern.DOTALL);
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+ private static final Pattern P_END_ARROW = Pattern.compile("^>");
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+ private static final Pattern P_BODY_TO_END = Pattern.compile("<([^>]*?)(?=<|$)");
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+ private static final Pattern P_XML_CONTENT = Pattern.compile("(^|>)([^<]*?)(?=>)");
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+ private static final Pattern P_STRAY_LEFT_ARROW = Pattern.compile("<([^>]*?)(?=<|$)");
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+ private static final Pattern P_STRAY_RIGHT_ARROW = Pattern.compile("(^|>)([^<]*?)(?=>)");
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+ private static final Pattern P_AMP = Pattern.compile("&");
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+ private static final Pattern P_QUOTE = Pattern.compile("\"");
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+ private static final Pattern P_LEFT_ARROW = Pattern.compile("<");
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+ private static final Pattern P_RIGHT_ARROW = Pattern.compile(">");
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+ private static final Pattern P_BOTH_ARROWS = Pattern.compile("<>");
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+
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+ // @xxx could grow large... maybe use sesat's ReferenceMap
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+ private static final ConcurrentMap<String, Pattern> P_REMOVE_PAIR_BLANKS = new ConcurrentHashMap<>();
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+ private static final ConcurrentMap<String, Pattern> P_REMOVE_SELF_BLANKS = new ConcurrentHashMap<>();
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+
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+ /**
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+ * set of allowed html elements, along with allowed attributes for each element
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+ **/
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+ private final Map<String, List<String>> vAllowed;
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+ /**
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+ * counts of open tags for each (allowable) html element
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+ **/
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+ private final Map<String, Integer> vTagCounts = new HashMap<>();
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+
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+ /**
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+ * html elements which must always be self-closing (e.g. "<img />")
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+ **/
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+ private final String[] vSelfClosingTags;
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+ /**
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+ * html elements which must always have separate opening and closing tags (e.g. "<b></b>")
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+ **/
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+ private final String[] vNeedClosingTags;
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+ /**
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+ * set of disallowed html elements
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+ **/
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+ private final String[] vDisallowed;
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+ /**
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+ * attributes which should be checked for valid protocols
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+ **/
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+ private final String[] vProtocolAtts;
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+ /**
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+ * allowed protocols
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+ **/
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+ private final String[] vAllowedProtocols;
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+ /**
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+ * tags which should be removed if they contain no content (e.g. "<b></b>" or "<b />")
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+ **/
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+ private final String[] vRemoveBlanks;
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+ /**
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+ * entities allowed within html markup
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+ **/
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+ private final String[] vAllowedEntities;
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+ /**
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+ * flag determining whether comments are allowed in input String.
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+ */
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+ private final boolean stripComment;
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+ private final boolean encodeQuotes;
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+ /**
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+ * flag determining whether to try to make tags when presented with "unbalanced" angle brackets (e.g. "<b text </b>"
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+ * becomes "<b> text </b>"). If set to false, unbalanced angle brackets will be html escaped.
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+ */
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+ private final boolean alwaysMakeTags;
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+
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+ /**
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+ * Default constructor.
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+ */
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+ public HTMLFilter() {
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+ vAllowed = new HashMap<>();
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+
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+ final ArrayList<String> a_atts = new ArrayList<>();
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+ a_atts.add("href");
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+ a_atts.add("target");
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+ vAllowed.put("a", a_atts);
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+
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+ final ArrayList<String> img_atts = new ArrayList<>();
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+ img_atts.add("src");
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+ img_atts.add("width");
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+ img_atts.add("height");
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+ img_atts.add("alt");
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+ vAllowed.put("img", img_atts);
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+
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+ final ArrayList<String> no_atts = new ArrayList<>();
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+ vAllowed.put("b", no_atts);
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+ vAllowed.put("strong", no_atts);
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+ vAllowed.put("i", no_atts);
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+ vAllowed.put("em", no_atts);
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+
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+ vSelfClosingTags = new String[]{"img"};
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+ vNeedClosingTags = new String[]{"a", "b", "strong", "i", "em"};
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+ vDisallowed = new String[]{};
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+ vAllowedProtocols = new String[]{"http", "mailto", "https"}; // no ftp.
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+ vProtocolAtts = new String[]{"src", "href"};
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+ vRemoveBlanks = new String[]{"a", "b", "strong", "i", "em"};
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+ vAllowedEntities = new String[]{"amp", "gt", "lt", "quot"};
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+ stripComment = true;
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+ encodeQuotes = true;
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+ alwaysMakeTags = false;
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+ }
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+
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+ /**
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+ * Map-parameter configurable constructor.
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+ *
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+ * @param conf map containing configuration. keys match field names.
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+ */
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+ @SuppressWarnings("unchecked")
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+ public HTMLFilter(final Map<String, Object> conf) {
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+
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+ assert conf.containsKey("vAllowed") : "configuration requires vAllowed";
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+ assert conf.containsKey("vSelfClosingTags") : "configuration requires vSelfClosingTags";
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+ assert conf.containsKey("vNeedClosingTags") : "configuration requires vNeedClosingTags";
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+ assert conf.containsKey("vDisallowed") : "configuration requires vDisallowed";
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+ assert conf.containsKey("vAllowedProtocols") : "configuration requires vAllowedProtocols";
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+ assert conf.containsKey("vProtocolAtts") : "configuration requires vProtocolAtts";
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+ assert conf.containsKey("vRemoveBlanks") : "configuration requires vRemoveBlanks";
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+ assert conf.containsKey("vAllowedEntities") : "configuration requires vAllowedEntities";
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+
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+ vAllowed = Collections.unmodifiableMap((HashMap<String, List<String>>) conf.get("vAllowed"));
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+ vSelfClosingTags = (String[]) conf.get("vSelfClosingTags");
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+ vNeedClosingTags = (String[]) conf.get("vNeedClosingTags");
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+ vDisallowed = (String[]) conf.get("vDisallowed");
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+ vAllowedProtocols = (String[]) conf.get("vAllowedProtocols");
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+ vProtocolAtts = (String[]) conf.get("vProtocolAtts");
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+ vRemoveBlanks = (String[]) conf.get("vRemoveBlanks");
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+ vAllowedEntities = (String[]) conf.get("vAllowedEntities");
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+ stripComment = conf.containsKey("stripComment") ? (Boolean) conf.get("stripComment") : true;
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+ encodeQuotes = conf.containsKey("encodeQuotes") ? (Boolean) conf.get("encodeQuotes") : true;
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+ alwaysMakeTags = conf.containsKey("alwaysMakeTags") ? (Boolean) conf.get("alwaysMakeTags") : true;
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+ }
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+
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+ // ---------------------------------------------------------------
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+ // my versions of some PHP library functions
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+ public static String chr(final int decimal) {
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+ return String.valueOf((char) decimal);
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+ }
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+
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+ public static String htmlSpecialChars(final String s) {
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+ String result = s;
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+ result = regexReplace(P_AMP, "&", result);
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+ result = regexReplace(P_QUOTE, """, result);
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+ result = regexReplace(P_LEFT_ARROW, "<", result);
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+ result = regexReplace(P_RIGHT_ARROW, ">", result);
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+ return result;
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+ }
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+
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+ private static String regexReplace(final Pattern regex_pattern, final String replacement, final String s) {
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+ Matcher m = regex_pattern.matcher(s);
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+ return m.replaceAll(replacement);
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+ }
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+
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+ // ---------------------------------------------------------------
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+
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+ private static boolean inArray(final String s, final String[] array) {
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+ for (String item : array) {
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+ if (item != null && item.equals(s)) {
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+ return true;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ private void reset() {
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+ vTagCounts.clear();
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+ }
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+
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+ /**
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+ * given a user submitted input String, filter out any invalid or restricted html.
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+ *
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+ * @param input text (i.e. submitted by a user) than may contain html
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+ * @return "clean" version of input, with only valid, whitelisted html elements allowed
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+ */
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+ public String filter(final String input) {
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+ reset();
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+ String s = input;
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+
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+ s = escapeComments(s);
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+
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+ s = balanceHTML(s);
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+
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+ s = checkTags(s);
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+
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+ s = processRemoveBlanks(s);
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+
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+ // s = validateEntities(s);
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+
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+ return s;
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+ }
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+
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+ public boolean isAlwaysMakeTags() {
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+ return alwaysMakeTags;
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+ }
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+
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+ public boolean isStripComments() {
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+ return stripComment;
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+ }
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+
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+ private String escapeComments(final String s) {
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+ final Matcher m = P_COMMENTS.matcher(s);
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+ final StringBuffer buf = new StringBuffer();
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+ if (m.find()) {
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+ final String match = m.group(1); // (.*?)
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+ m.appendReplacement(buf, Matcher.quoteReplacement("<!--" + htmlSpecialChars(match) + "-->"));
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+ }
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+ m.appendTail(buf);
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+
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+ return buf.toString();
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+ }
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+
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+ private String balanceHTML(String s) {
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+ if (alwaysMakeTags) {
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+ //
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+ // try and form html
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+ //
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+ s = regexReplace(P_END_ARROW, "", s);
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+ // 不追加结束标签
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+ s = regexReplace(P_BODY_TO_END, "<$1>", s);
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+ s = regexReplace(P_XML_CONTENT, "$1<$2", s);
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+
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+ } else {
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+ //
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+ // escape stray brackets
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+ //
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+ s = regexReplace(P_STRAY_LEFT_ARROW, "<$1", s);
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+ s = regexReplace(P_STRAY_RIGHT_ARROW, "$1$2><", s);
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+
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+ //
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+ // the last regexp causes '<>' entities to appear
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+ // (we need to do a lookahead assertion so that the last bracket can
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+ // be used in the next pass of the regexp)
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+ //
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+ s = regexReplace(P_BOTH_ARROWS, "", s);
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+ }
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+
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+ return s;
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+ }
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+
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+ private String checkTags(String s) {
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+ Matcher m = P_TAGS.matcher(s);
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+
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+ final StringBuffer buf = new StringBuffer();
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+ while (m.find()) {
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+ String replaceStr = m.group(1);
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+ replaceStr = processTag(replaceStr);
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+ m.appendReplacement(buf, Matcher.quoteReplacement(replaceStr));
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+ }
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+ m.appendTail(buf);
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+
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+ // these get tallied in processTag
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+ // (remember to reset before subsequent calls to filter method)
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+ final StringBuilder sBuilder = new StringBuilder(buf.toString());
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+ for (String key : vTagCounts.keySet()) {
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+ for (int ii = 0; ii < vTagCounts.get(key); ii++) {
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+ sBuilder.append("</").append(key).append(">");
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+ }
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+ }
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+ s = sBuilder.toString();
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+
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+ return s;
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+ }
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+
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+ private String processRemoveBlanks(final String s) {
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+ String result = s;
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+ for (String tag : vRemoveBlanks) {
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+ if (!P_REMOVE_PAIR_BLANKS.containsKey(tag)) {
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+ P_REMOVE_PAIR_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?></" + tag + ">"));
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+ }
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+ result = regexReplace(P_REMOVE_PAIR_BLANKS.get(tag), "", result);
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+ if (!P_REMOVE_SELF_BLANKS.containsKey(tag)) {
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+ P_REMOVE_SELF_BLANKS.putIfAbsent(tag, Pattern.compile("<" + tag + "(\\s[^>]*)?/>"));
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+ }
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+ result = regexReplace(P_REMOVE_SELF_BLANKS.get(tag), "", result);
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+ }
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+
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+ return result;
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+ }
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+
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+ private String processTag(final String s) {
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+ // ending tags
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+ Matcher m = P_END_TAG.matcher(s);
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+ if (m.find()) {
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+ final String name = m.group(1).toLowerCase();
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+ if (allowed(name)) {
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+ if (!inArray(name, vSelfClosingTags)) {
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+ if (vTagCounts.containsKey(name)) {
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+ vTagCounts.put(name, vTagCounts.get(name) - 1);
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+ return "</" + name + ">";
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+ }
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+ }
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+ }
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+ }
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+
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+ // starting tags
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+ m = P_START_TAG.matcher(s);
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+ if (m.find()) {
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+ final String name = m.group(1).toLowerCase();
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+ final String body = m.group(2);
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+ String ending = m.group(3);
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+
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+ // debug( "in a starting tag, name='" + name + "'; body='" + body + "'; ending='" + ending + "'" );
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+ if (allowed(name)) {
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+ final StringBuilder params = new StringBuilder();
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+
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+ final Matcher m2 = P_QUOTED_ATTRIBUTES.matcher(body);
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+ final Matcher m3 = P_UNQUOTED_ATTRIBUTES.matcher(body);
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+ final List<String> paramNames = new ArrayList<>();
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+ final List<String> paramValues = new ArrayList<>();
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+ while (m2.find()) {
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+ paramNames.add(m2.group(1)); // ([a-z0-9]+)
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+ paramValues.add(m2.group(3)); // (.*?)
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+ }
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+ while (m3.find()) {
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+ paramNames.add(m3.group(1)); // ([a-z0-9]+)
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+ paramValues.add(m3.group(3)); // ([^\"\\s']+)
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+ }
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+
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+ String paramName, paramValue;
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+ for (int ii = 0; ii < paramNames.size(); ii++) {
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+ paramName = paramNames.get(ii).toLowerCase();
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+ paramValue = paramValues.get(ii);
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+
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+ // debug( "paramName='" + paramName + "'" );
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+ // debug( "paramValue='" + paramValue + "'" );
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+ // debug( "allowed? " + vAllowed.get( name ).contains( paramName ) );
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+
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+ if (allowedAttribute(name, paramName)) {
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+ if (inArray(paramName, vProtocolAtts)) {
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+ paramValue = processParamProtocol(paramValue);
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+ }
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+ params.append(' ').append(paramName).append("=\\\"").append(paramValue).append("\"");
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+ }
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+ }
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+
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+ if (inArray(name, vSelfClosingTags)) {
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+ ending = " /";
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+ }
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+
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+ if (inArray(name, vNeedClosingTags)) {
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+ ending = "";
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+ }
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+
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+ if (ending == null || ending.length() < 1) {
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+ if (vTagCounts.containsKey(name)) {
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+ vTagCounts.put(name, vTagCounts.get(name) + 1);
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+ } else {
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+ vTagCounts.put(name, 1);
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+ }
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+ } else {
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+ ending = " /";
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+ }
|
|
|
+ return "<" + name + params + ending + ">";
|
|
|
+ } else {
|
|
|
+ return "";
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ // comments
|
|
|
+ m = P_COMMENT.matcher(s);
|
|
|
+ if (!stripComment && m.find()) {
|
|
|
+ return "<" + m.group() + ">";
|
|
|
+ }
|
|
|
+
|
|
|
+ return "";
|
|
|
+ }
|
|
|
+
|
|
|
+ private String processParamProtocol(String s) {
|
|
|
+ s = decodeEntities(s);
|
|
|
+ final Matcher m = P_PROTOCOL.matcher(s);
|
|
|
+ if (m.find()) {
|
|
|
+ final String protocol = m.group(1);
|
|
|
+ if (!inArray(protocol, vAllowedProtocols)) {
|
|
|
+ // bad protocol, turn into local anchor link instead
|
|
|
+ s = "#" + s.substring(protocol.length() + 1);
|
|
|
+ if (s.startsWith("#//")) {
|
|
|
+ s = "#" + s.substring(3);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ return s;
|
|
|
+ }
|
|
|
+
|
|
|
+ private String decodeEntities(String s) {
|
|
|
+ StringBuffer buf = new StringBuffer();
|
|
|
+
|
|
|
+ Matcher m = P_ENTITY.matcher(s);
|
|
|
+ while (m.find()) {
|
|
|
+ final String match = m.group(1);
|
|
|
+ final int decimal = Integer.decode(match).intValue();
|
|
|
+ m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
+ }
|
|
|
+ m.appendTail(buf);
|
|
|
+ s = buf.toString();
|
|
|
+
|
|
|
+ buf = new StringBuffer();
|
|
|
+ m = P_ENTITY_UNICODE.matcher(s);
|
|
|
+ while (m.find()) {
|
|
|
+ final String match = m.group(1);
|
|
|
+ final int decimal = Integer.valueOf(match, 16).intValue();
|
|
|
+ m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
+ }
|
|
|
+ m.appendTail(buf);
|
|
|
+ s = buf.toString();
|
|
|
+
|
|
|
+ buf = new StringBuffer();
|
|
|
+ m = P_ENCODE.matcher(s);
|
|
|
+ while (m.find()) {
|
|
|
+ final String match = m.group(1);
|
|
|
+ final int decimal = Integer.valueOf(match, 16).intValue();
|
|
|
+ m.appendReplacement(buf, Matcher.quoteReplacement(chr(decimal)));
|
|
|
+ }
|
|
|
+ m.appendTail(buf);
|
|
|
+ s = buf.toString();
|
|
|
+
|
|
|
+ s = validateEntities(s);
|
|
|
+ return s;
|
|
|
+ }
|
|
|
+
|
|
|
+ private String validateEntities(final String s) {
|
|
|
+ StringBuffer buf = new StringBuffer();
|
|
|
+
|
|
|
+ // validate entities throughout the string
|
|
|
+ Matcher m = P_VALID_ENTITIES.matcher(s);
|
|
|
+ while (m.find()) {
|
|
|
+ final String one = m.group(1); // ([^&;]*)
|
|
|
+ final String two = m.group(2); // (?=(;|&|$))
|
|
|
+ m.appendReplacement(buf, Matcher.quoteReplacement(checkEntity(one, two)));
|
|
|
+ }
|
|
|
+ m.appendTail(buf);
|
|
|
+
|
|
|
+ return encodeQuotes(buf.toString());
|
|
|
+ }
|
|
|
+
|
|
|
+ private String encodeQuotes(final String s) {
|
|
|
+ if (encodeQuotes) {
|
|
|
+ StringBuffer buf = new StringBuffer();
|
|
|
+ Matcher m = P_VALID_QUOTES.matcher(s);
|
|
|
+ while (m.find()) {
|
|
|
+ final String one = m.group(1); // (>|^)
|
|
|
+ final String two = m.group(2); // ([^<]+?)
|
|
|
+ final String three = m.group(3); // (<|$)
|
|
|
+ // 不替换双引号为"，防止json格式无效 regexReplace(P_QUOTE, """, two)
|
|
|
+ m.appendReplacement(buf, Matcher.quoteReplacement(one + two + three));
|
|
|
+ }
|
|
|
+ m.appendTail(buf);
|
|
|
+ return buf.toString();
|
|
|
+ } else {
|
|
|
+ return s;
|
|
|
+ }
|
|
|
+ }
|
|
|
+
|
|
|
+ private String checkEntity(final String preamble, final String term) {
|
|
|
+
|
|
|
+ return ";".equals(term) && isValidEntity(preamble) ? '&' + preamble : "&" + preamble;
|
|
|
+ }
|
|
|
+
|
|
|
+ private boolean isValidEntity(final String entity) {
|
|
|
+ return inArray(entity, vAllowedEntities);
|
|
|
+ }
|
|
|
+
|
|
|
+ private boolean allowed(final String name) {
|
|
|
+ return (vAllowed.isEmpty() || vAllowed.containsKey(name)) && !inArray(name, vDisallowed);
|
|
|
+ }
|
|
|
+
|
|
|
+ private boolean allowedAttribute(final String name, final String paramName) {
|
|
|
+ return allowed(name) && (vAllowed.isEmpty() || vAllowed.get(name).contains(paramName));
|
|
|
+ }
|
|
|
+}
|
