过滤solr query 非法字符串的方法

solr是基于 lucence，非常的娇嫩，如果query中带有非法字符串，结果直接报错，所以你对用户的输入必须要先做处理.o

非法字符串的官方说明

• http://wiki.apache.org/solr/SolrQuerySyntax
• http://lucene.apache.org/core/4 00/queryparser/org/apache/lucene/queryparser/classic/package-summary.html#Escaping%20Special%20Characters

非法字符串有这些

+ - && || ! ( ) { } [ ] ^ " ~ * ? : \ /

过滤的方法很简单，用 \ 进行转义

solr 官方的处理方法

• https://svn.apache.org/repos/asf/lucene/dev/trunk/solr/solrj/src/java/org/apache/solr/client/solrj/util/ClientUtils.java

public static String escapeQueryChars(String s) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < s.length(); i++) {
      char c = s.charAt(i);
      // These characters are part of the query syntax and must be escaped
      if (c == '\\' || c == '+' || c == '-' || c == '!'  || c == '(' || c == ')' || c == ':'
        || c == '^' || c == '[' || c == ']' || c == '\"' || c == '{' || c == '}' || c == '~'
        || c == '*' || c == '?' || c == '|' || c == '&'  || c == ';' || c == '/'
        || Character.isWhitespace(c)) {
        sb.append('\\');
      }
      sb.append(c);
    }
    return sb.toString();
  }

参考官方规则，我写了下面两段函数

php 版本过滤函数

static public function escape($value)
{
    //list taken from http://lucene.apache.org/java/docs/queryparsersyntax.html#Escaping%20Special%20Characters
    $pattern = '/(\+|-|&|\||!|\(|\)|\{|}|\[|]|\^|"|~|\*|\?|:|;|~|\/)/';
    $replace = '\\\$1';

    return preg_replace($pattern, $replace, $value);
}

python 版本过滤函数

import re

def escape_solr(word):
	return re.sub('(\\\|\+|-|&|\|\||!|\(|\)|\{|}|\[|]|\^|"|~|\*|\?|:|;|/|\~)','\\\1', word )