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| Rev | Author | Line No. | Line |
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| 3 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /* |
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| 4 | * OID-Utilities for PHP |
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| 12 | daniel-mar | 5 | * Copyright 2011-2020 Daniel Marschall, ViaThinkSoft |
| 6 | * Version 2020-06-11 |
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| 3 | daniel-mar | 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 9 | * you may not use this file except in compliance with the License. |
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| 10 | * You may obtain a copy of the License at |
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| 11 | * |
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| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 13 | * |
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| 14 | * Unless required by applicable law or agreed to in writing, software |
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| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 17 | * See the License for the specific language governing permissions and |
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| 18 | * limitations under the License. |
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| 19 | */ |
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| 20 | |||
| 21 | // All functions in this library are compatible with leading zeroes (not recommended) and leading dots |
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| 22 | |||
| 12 | daniel-mar | 23 | // TODO: change some function names, so that they have a uniform naming schema, and rename "oid identifier" into "asn.1 alphanumeric identifier" |
| 24 | // oid_id_is_valid() => asn1_alpha_id_valid() |
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| 3 | daniel-mar | 25 | |
| 26 | define('OID_DOT_FORBIDDEN', 0); |
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| 27 | define('OID_DOT_OPTIONAL', 1); |
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| 28 | define('OID_DOT_REQUIRED', 2); |
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| 29 | |||
| 30 | /** |
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| 31 | * Checks if an OID has a valid dot notation. |
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| 32 | * @author Daniel Marschall, ViaThinkSoft |
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| 33 | * @version 2014-12-09 |
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| 34 | * @param $oid (string)<br /> |
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| 35 | * An OID in dot notation. |
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| 36 | * @param $allow_leading_zeroes (bool)<br /> |
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| 37 | * true of leading zeroes are allowed or not. |
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| 38 | * @param $allow_leading_dot (bool)<br /> |
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| 39 | * true of leading dots are allowed or not. |
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| 40 | * @return (bool) true if the dot notation is valid. |
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| 41 | **/ |
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| 42 | function oid_valid_dotnotation($oid, $allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { |
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| 43 | $regex = oid_validation_regex($allow_leading_zeroes, $allow_leading_dot, $min_len); |
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| 44 | |||
| 45 | return preg_match($regex, $oid, $m) ? true : false; |
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| 46 | } |
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| 47 | |||
| 48 | /** |
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| 49 | * Returns a full regular expression to validate an OID in dot-notation |
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| 50 | * @author Daniel Marschall, ViaThinkSoft |
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| 51 | * @version 2014-12-09 |
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| 52 | * @param $allow_leading_zeroes (bool)<br /> |
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| 53 | * true of leading zeroes are allowed or not. |
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| 54 | * @param $allow_leading_dot (bool)<br /> |
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| 55 | * true of leading dots are allowed or not. |
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| 56 | * @return (string) The regular expression |
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| 57 | **/ |
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| 58 | function oid_validation_regex($allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { |
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| 59 | $leading_dot_policy = $allow_leading_dot ? OID_DOT_OPTIONAL : OID_DOT_FORBIDDEN; |
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| 60 | |||
| 61 | $part_regex = oid_part_regex($min_len, $allow_leading_zeroes, $leading_dot_policy); |
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| 62 | |||
| 63 | return '@^'.$part_regex.'$@'; |
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| 64 | } |
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| 65 | |||
| 66 | /** |
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| 67 | * Returns a partial regular expression which matches valid OIDs in dot notation. |
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| 68 | * It can be inserted into regular expressions. |
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| 69 | * @author Daniel Marschall, ViaThinkSoft |
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| 70 | * @version 2014-12-09 |
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| 71 | * @param $min_len (int)<br /> |
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| 72 | * 0="." and greater will be recognized, but not ""<br /> |
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| 73 | * 1=".2" and greater will be recognized<br /> |
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| 74 | * 2=".2.999" and greater will be recognized (default)<br /> |
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| 75 | * etc. |
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| 76 | * @param $allow_leading_zeroes (bool)<br /> |
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| 77 | * true: ".2.0999" will be recognized<br /> |
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| 78 | * false: ".2.0999" won't be recognized (default) |
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| 79 | * @param $leading_dot_policy (int)<br /> |
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| 80 | * 0 (OID_DOT_FORBIDDEN): forbidden<br /> |
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| 81 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br /> |
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| 82 | * 2 (OID_DOT_REQUIRED) : enforced |
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| 83 | * @return (string) A regular expression which matches OIDs in dot notation |
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| 84 | **/ |
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| 85 | function oid_part_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL) { |
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| 86 | switch ($leading_dot_policy) { |
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| 87 | case 0: // forbidden |
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| 88 | $lead_dot = ''; |
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| 89 | break; |
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| 90 | case 1: // optional |
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| 91 | $lead_dot = '\\.{0,1}'; |
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| 92 | break; |
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| 93 | case 2: // enforced |
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| 94 | $lead_dot = '\\.'; |
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| 95 | break; |
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| 96 | default: |
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| 97 | assert(false); |
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| 98 | break; |
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| 99 | } |
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| 100 | |||
| 101 | $lead_zero = $allow_leading_zeroes ? '0*' : ''; |
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| 102 | $zero_till_thirtynine = '(([0-9])|([1-3][0-9]))'; // second arc is limited to 0..39 if root arc is 0..1 |
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| 103 | $singledot_option = ($min_len == 0) && ($leading_dot_policy != OID_DOT_FORBIDDEN) ? '|\\.' : ''; |
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| 104 | $only_root_option = ($min_len <= 1) ? '|('.$lead_dot.$lead_zero.'[0-2])' : ''; |
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| 105 | |||
| 106 | $regex = ' |
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| 107 | ( |
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| 108 | ( |
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| 109 | ( |
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| 110 | ('.$lead_dot.$lead_zero.'[0-1]) |
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| 111 | \\.'.$lead_zero.$zero_till_thirtynine.' |
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| 112 | (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-2).',} |
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| 113 | )|( |
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| 114 | ('.$lead_dot.$lead_zero.'[2]) |
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| 115 | (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-1).',} |
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| 116 | ) |
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| 117 | '.$only_root_option.' |
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| 118 | '.$singledot_option.' |
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| 119 | ) |
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| 120 | )'; |
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| 121 | |||
| 122 | // Remove the indentations which are used to maintain this large regular expression in a human friendly way |
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| 123 | $regex = str_replace("\n", '', $regex); |
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| 124 | $regex = str_replace("\r", '', $regex); |
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| 125 | $regex = str_replace("\t", '', $regex); |
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| 126 | $regex = str_replace(' ', '', $regex); |
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| 127 | |||
| 128 | return $regex; |
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| 129 | } |
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| 130 | |||
| 131 | /** |
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| 132 | * Searches all OIDs in $text and outputs them as array. |
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| 133 | * @author Daniel Marschall, ViaThinkSoft |
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| 134 | * @version 2014-12-09 |
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| 135 | * @param $text (string)<br /> |
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| 136 | * The text to be parsed |
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| 137 | * @param $min_len (int)<br /> |
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| 138 | * 0="." and greater will be recognized, but not ""<br /> |
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| 139 | * 1=".2" and greater will be recognized<br /> |
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| 140 | * 2=".2.999" and greater will be recognized (default)<br /> |
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| 141 | * etc. |
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| 142 | * @param $allow_leading_zeroes (bool)<br /> |
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| 143 | * true: ".2.0999" will be recognized<br /> |
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| 144 | * false: ".2.0999" won't be recognized (default) |
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| 145 | * @param $leading_dot_policy (int)<br /> |
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| 146 | * 0 (OID_DOT_FORBIDDEN): forbidden<br /> |
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| 147 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br /> |
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| 148 | * 2 (OID_DOT_REQUIRED) : enforced |
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| 149 | * @param $requires_whitespace_delimiters (bool)<br /> |
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| 150 | * true: "2.999" will be recognized, as well as " 2.999 " (default)<br /> |
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| 151 | * false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) |
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| 152 | * @return (array<string>) An array of OIDs in dot notation |
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| 153 | **/ |
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| 154 | function parse_oids($text, $min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { |
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| 155 | $regex = oid_detection_regex($min_len, $allow_leading_zeroes, $leading_dot_policy, $requires_whitespace_delimiters); |
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| 156 | |||
| 157 | preg_match_all($regex, $text, $matches); |
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| 158 | return $matches[1]; |
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| 159 | } |
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| 160 | |||
| 161 | /** |
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| 162 | * Returns a full regular expression for detecting OIDs in dot notation inside a text. |
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| 163 | * @author Daniel Marschall, ViaThinkSoft |
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| 164 | * @version 2014-12-09 |
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| 165 | * @param $min_len (int)<br /> |
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| 166 | * 0="." and greater will be recognized, but not ""<br /> |
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| 167 | * 1=".2" and greater will be recognized<br /> |
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| 168 | * 2=".2.999" and greater will be recognized (default)<br /> |
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| 169 | * etc. |
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| 170 | * @param $allow_leading_zeroes (bool)<br /> |
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| 171 | * true: ".2.0999" will be recognized<br /> |
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| 172 | * false: ".2.0999" won't be recognized (default) |
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| 173 | * @param $leading_dot_policy (int)<br /> |
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| 174 | * 0 (OID_DOT_FORBIDDEN): forbidden<br /> |
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| 175 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br /> |
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| 176 | * 2 (OID_DOT_REQUIRED) : enforced |
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| 177 | * @param $requires_whitespace_delimiters (bool)<br /> |
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| 178 | * true: "2.999" will be recognized, as well as " 2.999 " (default)<br /> |
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| 179 | * false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) |
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| 180 | * @return (string) The regular expression |
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| 181 | **/ |
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| 182 | function oid_detection_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { |
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| 183 | if ($requires_whitespace_delimiters) { |
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| 184 | // A fully qualified regular expression which can be used by preg_match() |
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| 185 | $begin_condition = '(?<=^|\\s)'; |
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| 186 | $end_condition = '(?=\\s|$)'; |
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| 187 | } else { |
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| 188 | // A partial expression which can be used inside another regular expression |
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| 189 | $begin_condition = '(?<![\d])'; |
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| 190 | $end_condition = '(?![\d])'; |
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| 191 | } |
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| 192 | |||
| 193 | $part_regex = oid_part_regex($min_len, $allow_leading_zeroes, $leading_dot_policy); |
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| 194 | |||
| 195 | return '@'.$begin_condition.$part_regex.$end_condition.'@'; |
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| 196 | } |
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| 197 | |||
| 198 | /** |
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| 199 | * Returns the parent of an OID in dot notation or the OID itself, if it is the root.<br /> |
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| 200 | * Leading dots and leading zeroes are tolerated. |
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| 201 | * @author Daniel Marschall, ViaThinkSoft |
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| 202 | * @version 2014-12-16 |
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| 203 | * @param $oid (string)<br /> |
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| 204 | * An OID in dot notation. |
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| 205 | * @return (string) The parent OID in dot notation. |
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| 206 | **/ |
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| 207 | function oid_up($oid) { |
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| 208 | $oid = sanitizeOID($oid, 'auto'); |
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| 209 | if ($oid === false) return false; |
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| 210 | |||
| 211 | $p = strrpos($oid, '.'); |
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| 212 | if ($p === false) return $oid; |
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| 213 | if ($p == 0) return '.'; |
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| 214 | |||
| 215 | return substr($oid, 0, $p); |
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| 216 | } |
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| 217 | |||
| 218 | /** |
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| 219 | * Outputs the depth of an OID. |
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| 220 | * @author Daniel Marschall, ViaThinkSoft |
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| 221 | * @version 2014-12-09 |
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| 222 | * @param $oid (string) An OID in dot notation (with or without leading dot) |
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| 223 | * @return (int) The depth of the OID, e.g. 2.999 and .2.999 has the length 2. |
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| 224 | **/ |
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| 225 | function oid_len($oid) { |
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| 226 | if ($oid == '') return 0; |
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| 227 | if ($oid[0] == '.') $oid = substr($oid, 1); |
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| 228 | return substr_count($oid, '.')+1; |
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| 229 | } |
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| 230 | function oid_depth($oid) { |
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| 231 | return oid_len($oid); |
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| 232 | } |
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| 233 | |||
| 234 | /** |
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| 235 | * Lists all parents of an OID. |
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| 236 | * This function tolerates leading dots. The parent of '.' stays '.'. |
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| 237 | * The OID will not be checked for validity! |
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| 238 | * @author Daniel Marschall, ViaThinkSoft |
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| 239 | * @version 2014-12-17 |
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| 240 | * @param $oid (string)<br /> |
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| 241 | * An OID in dot notation. |
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| 242 | * @return (array<string>) An array with all parent OIDs. |
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| 243 | **/ |
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| 244 | function oid_parents($oid) { |
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| 245 | $parents = array(); |
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| 246 | |||
| 247 | while (oid_len($oid) > 1) { |
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| 248 | $oid = oid_up($oid); |
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| 249 | $parents[] = $oid; |
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| 250 | } |
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| 251 | |||
| 252 | if (substr($oid, 0, 1) == '.') $parents[] = '.'; |
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| 253 | |||
| 254 | return $parents; |
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| 255 | } |
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| 256 | |||
| 257 | /* |
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| 258 | assert(oid_parents('.1.2.999') == array('.1.2', '.1', '.')); |
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| 259 | assert(oid_parents('1.2.999') == array('1.2', '1')); |
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| 260 | assert(oid_parents('.') == array('.')); |
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| 261 | assert(oid_parents('') == array()); |
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| 262 | */ |
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| 263 | |||
| 264 | /** |
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| 265 | * Sorts an array containing OIDs in dot notation. |
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| 266 | * @author Daniel Marschall, ViaThinkSoft |
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| 267 | * @version 2014-12-09 |
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| 268 | * @param $ary (array<string>)<br /> |
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| 269 | * An array of OIDs in dot notation.<br /> |
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| 270 | * This array will be changed by this method. |
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| 271 | * @param $output_with_leading_dot (bool)<br /> |
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| 272 | * true: The array will be normalized to OIDs with a leading dot. |
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| 273 | * false: The array will be normalized to OIDs without a leading dot. (default) |
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| 274 | * @return Nothing |
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| 275 | **/ |
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| 276 | function oidSort(&$ary, $output_with_leading_dot=false) { |
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| 277 | $out = array(); |
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| 278 | |||
| 279 | $none = $output_with_leading_dot ? '.' : ''; |
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| 280 | |||
| 281 | $d = array(); |
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| 282 | foreach ($ary as &$oid) { |
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| 283 | if (($oid == '') || ($oid == '.')) { |
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| 284 | $out[] = $none; |
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| 285 | } else { |
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| 286 | $oid = sanitizeOID($oid, 'auto'); // strike leading zeroes |
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| 287 | $bry = explode('.', $oid, 2); |
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| 288 | $firstarc = $bry[0]; |
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| 289 | $rest = (isset($bry[1])) ? $bry[1] : ''; |
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| 290 | $d[$firstarc][] = $rest; |
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| 291 | } |
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| 292 | } |
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| 293 | unset($oid); |
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| 294 | ksort($d); |
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| 295 | |||
| 296 | foreach ($d as $firstarc => &$data) { |
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| 297 | oidSort($data); |
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| 298 | foreach ($data as &$rest) { |
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| 299 | $out[] = ($output_with_leading_dot ? '.' : '')."$firstarc" . (($rest != $none) ? ".$rest" : ''); |
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| 300 | } |
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| 301 | } |
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| 302 | unset($data); |
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| 303 | |||
| 304 | $ary = $out; |
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| 305 | } |
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| 306 | |||
| 307 | /** |
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| 12 | daniel-mar | 308 | * Checks if two OIDs in dot-notation are equal |
| 309 | * @author Daniel Marschall, ViaThinkSoft |
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| 310 | * @version 2020-05-27 |
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| 311 | * @param $oidA (string)<br /> |
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| 312 | * First OID |
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| 313 | * @param $oidB (string)<br /> |
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| 314 | * Second OID |
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| 315 | * @return (bool) True if the OIDs are equal |
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| 316 | **/ |
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| 317 | function oid_dotnotation_equal($oidA, $oidB) { |
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| 318 | $oidA = sanitizeOID($oidA, false); |
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| 319 | if ($oidA === false) return null; |
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| 320 | |||
| 321 | $oidB = sanitizeOID($oidB, false); |
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| 322 | if ($oidB === false) return null; |
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| 323 | |||
| 324 | return $oidA === $oidB; |
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| 325 | } |
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| 326 | |||
| 327 | /** |
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| 3 | daniel-mar | 328 | * Removes leading zeroes from an OID in dot notation. |
| 329 | * @author Daniel Marschall, ViaThinkSoft |
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| 330 | * @version 2015-08-17 |
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| 331 | * @param $oid (string)<br /> |
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| 332 | * An OID in dot notation. |
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| 333 | * @param $leading_dot (bool)<br /> |
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| 334 | * true: The OID is valid, if it contains a leading dot.<br /> |
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| 335 | * false (default): The OID is valid, if it does not contain a leading dot. |
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| 336 | * 'auto: Allow both |
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| 337 | * @return (mixed) The OID without leading dots, or <code>false</code> if the OID is syntactically wrong. |
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| 338 | **/ |
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| 339 | $oid_sanitize_cache = array(); |
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| 340 | function sanitizeOID($oid, $leading_dot=false) { |
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| 341 | if ($leading_dot) $leading_dot = substr($oid,0,1) == '.'; |
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| 342 | |||
| 343 | // We are using a cache, since this function is used very often by OID+ |
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| 344 | global $oid_sanitize_cache; |
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| 345 | $v = ($leading_dot ? 'T' : 'F').$oid; |
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| 346 | if (isset($oid_sanitize_cache[$v])) return $oid_sanitize_cache[$v]; |
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| 347 | |||
| 348 | if ($leading_dot) { |
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| 349 | if ($oid == '.') return ''; |
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| 350 | } else { |
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| 351 | if ($oid == '') return ''; |
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| 352 | } |
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| 353 | |||
| 354 | $out = ''; |
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| 355 | $ary = explode('.', $oid); |
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| 356 | foreach ($ary as $n => &$a) { |
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| 357 | if (($leading_dot) && ($n == 0)) { |
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| 358 | if ($a != '') return false; |
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| 359 | continue; |
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| 360 | } |
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| 361 | |||
| 362 | if (!ctype_digit($a)) return false; // does contain something other than digits |
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| 363 | |||
| 364 | // strike leading zeroes |
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| 365 | $a = preg_replace("@^0+@", '', $a); |
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| 366 | if ($a == '') $a = 0; |
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| 367 | |||
| 368 | if (($leading_dot) || ($n != 0)) $out .= '.'; |
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| 369 | $out .= $a; |
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| 370 | } |
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| 371 | unset($a); |
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| 372 | unset($ary); |
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| 373 | |||
| 374 | $oid_sanitize_cache[$v] = $out; |
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| 375 | return $out; |
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| 376 | } |
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| 377 | |||
| 378 | /** |
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| 379 | * Shows the top arc of an OID. |
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| 380 | * This function tolerates leading dots. |
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| 381 | * @author Daniel Marschall, ViaThinkSoft |
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| 382 | * @version 2014-12-16 |
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| 383 | * @param $oid (string)<br /> |
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| 384 | * An OID in dot notation. |
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| 385 | * @return (mixed) The top arc of the OID or empty string if it is already the root ('.') |
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| 386 | **/ |
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| 387 | function oid_toparc($oid) { |
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| 388 | $leadingdot = substr($oid,0,1) == '.'; |
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| 389 | |||
| 390 | $oid = sanitizeOID($oid, $leadingdot); |
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| 391 | if ($oid === false) return false; |
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| 392 | |||
| 393 | if (!$leadingdot) $oid = '.'.$oid; |
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| 394 | |||
| 395 | $p = strrpos($oid, '.'); |
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| 396 | if ($p === false) return false; |
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| 397 | $r = substr($oid, $p+1); |
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| 398 | |||
| 399 | if ($leadingdot) { |
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| 400 | # if ($r == '') return '.'; |
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| 401 | return $r; |
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| 402 | } else { |
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| 403 | return substr($r, 1); |
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| 404 | } |
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| 405 | } |
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| 406 | |||
| 407 | /** |
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| 408 | * Calculates the distance between two OIDs. |
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| 409 | * This function tolerates leading dots and leading zeroes. |
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| 410 | * @author Daniel Marschall, ViaThinkSoft |
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| 411 | * @version 2014-12-20 |
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| 412 | * @param $a (string)<br /> |
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| 413 | * An OID. |
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| 414 | * @param $b (string)<br /> |
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| 415 | * An OID. |
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| 416 | * @return (string) false if both OIDs do not have a child-parent or parent-child relation, e.g. oid_distance('2.999.1.2.3', '2.999.4.5') = false, or if one of the OIDs is syntactially invalid<br /> |
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| 417 | * >0 if $a is more specific than $b , e.g. oid_distance('2.999.1.2', '2.999') = 2<br /> |
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| 418 | * <0 if $a is more common than $b , e.g. oid_distance('2.999', '2.999.1.2') = -2 |
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| 419 | **/ |
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| 420 | function oid_distance($a, $b) { |
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| 421 | if (substr($a,0,1) == '.') $a = substr($a,1); |
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| 422 | if (substr($b,0,1) == '.') $b = substr($b,1); |
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| 423 | |||
| 424 | $a = sanitizeOID($a, false); |
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| 425 | if ($a === false) return false; |
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| 426 | $b = sanitizeOID($b, false); |
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| 427 | if ($b === false) return false; |
||
| 428 | |||
| 429 | $ary = explode('.', $a); |
||
| 430 | $bry = explode('.', $b); |
||
| 431 | |||
| 432 | $min_len = min(count($ary), count($bry)); |
||
| 433 | |||
| 434 | for ($i=0; $i<$min_len; $i++) { |
||
| 435 | if ($ary[$i] != $bry[$i]) return false; |
||
| 436 | } |
||
| 437 | |||
| 438 | return count($ary) - count($bry); |
||
| 439 | } |
||
| 440 | /* |
||
| 441 | assert(oid_distance('2.999.1.2.3', '2.999.4.5') === false); |
||
| 442 | assert(oid_distance('2.999.1.2', '2.999') === 2); |
||
| 443 | assert(oid_distance('2.999', '2.999.1.2') === -2); |
||
| 444 | */ |
||
| 445 | |||
| 446 | /** |
||
| 447 | * Adds a leading dot to an OID. |
||
| 448 | * Leading zeroes are tolerated. |
||
| 449 | * @author Daniel Marschall, ViaThinkSoft |
||
| 450 | * @version 2014-12-20 |
||
| 451 | * @param $oid (string)<br /> |
||
| 452 | * An OID. |
||
| 453 | * @return (string) The OID with a leading dot or false if the OID is syntactially wrong. |
||
| 454 | **/ |
||
| 455 | function oid_add_leading_dot($oid) { |
||
| 456 | $oid = sanitizeOID($oid, 'auto'); |
||
| 457 | if ($oid === false) return false; |
||
| 458 | |||
| 459 | if ($oid[0] != '.') $oid = '.'.$oid; |
||
| 460 | return $oid; |
||
| 461 | } |
||
| 462 | |||
| 463 | /** |
||
| 464 | * Removes a leading dot to an OID. |
||
| 465 | * Leading zeroes are tolerated. |
||
| 466 | * @author Daniel Marschall, ViaThinkSoft |
||
| 467 | * @version 2014-12-20 |
||
| 468 | * @param $oid (string)<br /> |
||
| 469 | * An OID. |
||
| 470 | * @return (string) The OID without a leading dot or false if the OID is syntactially wrong. |
||
| 471 | **/ |
||
| 472 | function oid_remove_leading_dot($oid) { |
||
| 473 | $oid = sanitizeOID($oid, 'auto'); |
||
| 474 | if ($oid === false) return false; |
||
| 475 | |||
| 476 | if (substr($oid,0,1) == '.') $oid = substr($oid, 1); |
||
| 477 | return $oid; |
||
| 478 | } |
||
| 479 | |||
| 12 | daniel-mar | 480 | /** |
| 481 | * Find the common ancestor of two or more OIDs |
||
| 482 | * @author Daniel Marschall, ViaThinkSoft |
||
| 483 | * @version 2020-05-27 |
||
| 484 | * @param $oids (array)<br /> |
||
| 485 | * An array of multiple OIDs, e.g. 2.999.1 and 2.999.2.3.4 |
||
| 486 | * @return (mixed) The common ancestor, e.g. 2.999, or false if there is no common ancestor. |
||
| 487 | **/ |
||
| 488 | function oid_common_ancestor(array $oids) { |
||
| 489 | $shared = array(); |
||
| 3 | daniel-mar | 490 | |
| 12 | daniel-mar | 491 | if (!is_array($oids)) return false; |
| 492 | if (count($oids) === 0) return false; |
||
| 493 | |||
| 494 | foreach ($oids as &$oid) { |
||
| 495 | $oid = sanitizeOID($oid, false); |
||
| 496 | if ($oid === false) return false; |
||
| 497 | $oid = explode('.', $oid); |
||
| 498 | } |
||
| 499 | |||
| 500 | $max_ok = count($oids[0]); |
||
| 501 | for ($i=1; $i<count($oids); $i++) { |
||
| 502 | for ($j=0; $j<min(count($oids[$i]),count($oids[0])); $j++) { |
||
| 503 | if ($oids[$i][$j] != $oids[0][$j]) { |
||
| 504 | if ($j < $max_ok) $max_ok = $j; |
||
| 505 | break; |
||
| 506 | } |
||
| 507 | } |
||
| 508 | if ($j < $max_ok) $max_ok = $j; |
||
| 509 | } |
||
| 510 | |||
| 511 | $out = array(); |
||
| 512 | for ($i=0; $i<$max_ok; $i++) { |
||
| 513 | $out[] = $oids[0][$i]; |
||
| 514 | } |
||
| 515 | return implode('.', $out); |
||
| 516 | } |
||
| 517 | /* |
||
| 518 | assert(oid_shared_ancestor(array('2.999.4.5.3', '2.999.4.5')) === "2.999.4.5"); |
||
| 519 | assert(oid_shared_ancestor(array('2.999.4.5', '2.999.4.5.3')) === "2.999.4.5"); |
||
| 520 | assert(oid_shared_ancestor(array('2.999.1.2.3', '2.999.4.5')) === "2.999"); |
||
| 521 | */ |
||
| 522 | |||
| 523 | |||
| 3 | daniel-mar | 524 | # === OID-IRI NOTATION FUNCTIONS === |
| 525 | |||
| 526 | if (!function_exists('mb_ord')) { |
||
| 527 | # http://stackoverflow.com/a/24755772/3544341 |
||
| 528 | function mb_ord($char, $encoding = 'UTF-8') { |
||
| 529 | if ($encoding === 'UCS-4BE') { |
||
| 530 | list(, $ord) = (strlen($char) === 4) ? @unpack('N', $char) : @unpack('n', $char); |
||
| 531 | return $ord; |
||
| 532 | } else { |
||
| 533 | return mb_ord(mb_convert_encoding($char, 'UCS-4BE', $encoding), 'UCS-4BE'); |
||
| 534 | } |
||
| 535 | } |
||
| 536 | } |
||
| 537 | |||
| 538 | function iri_char_valid($c, $firstchar, $lastchar) { |
||
| 539 | // see Rec. ITU-T X.660, clause 7.5 |
||
| 540 | |||
| 541 | if (($firstchar || $lastchar) && ($c == '-')) return false; |
||
| 542 | |||
| 543 | if ($c == '-') return true; |
||
| 544 | if ($c == '.') return true; |
||
| 545 | if ($c == '_') return true; |
||
| 546 | if ($c == '~') return true; |
||
| 547 | if (($c >= '0') && ($c <= '9') && (!$firstchar)) return true; |
||
| 548 | if (($c >= 'A') && ($c <= 'Z')) return true; |
||
| 549 | if (($c >= 'a') && ($c <= 'z')) return true; |
||
| 550 | |||
| 551 | $v = mb_ord($c); |
||
| 552 | |||
| 553 | if (($v >= 0x000000A0) && ($v <= 0x0000DFFE)) return true; |
||
| 554 | if (($v >= 0x0000F900) && ($v <= 0x0000FDCF)) return true; |
||
| 555 | if (($v >= 0x0000FDF0) && ($v <= 0x0000FFEF)) return true; |
||
| 556 | if (($v >= 0x00010000) && ($v <= 0x0001FFFD)) return true; |
||
| 557 | if (($v >= 0x00020000) && ($v <= 0x0002FFFD)) return true; |
||
| 558 | if (($v >= 0x00030000) && ($v <= 0x0003FFFD)) return true; |
||
| 559 | if (($v >= 0x00040000) && ($v <= 0x0004FFFD)) return true; |
||
| 560 | if (($v >= 0x00050000) && ($v <= 0x0005FFFD)) return true; |
||
| 561 | if (($v >= 0x00060000) && ($v <= 0x0006FFFD)) return true; |
||
| 562 | if (($v >= 0x00070000) && ($v <= 0x0007FFFD)) return true; |
||
| 563 | if (($v >= 0x00080000) && ($v <= 0x0008FFFD)) return true; |
||
| 564 | if (($v >= 0x00090000) && ($v <= 0x0009FFFD)) return true; |
||
| 565 | if (($v >= 0x000A0000) && ($v <= 0x000AFFFD)) return true; |
||
| 566 | if (($v >= 0x000B0000) && ($v <= 0x000BFFFD)) return true; |
||
| 567 | if (($v >= 0x000C0000) && ($v <= 0x000CFFFD)) return true; |
||
| 568 | if (($v >= 0x000D0000) && ($v <= 0x000DFFFD)) return true; |
||
| 569 | if (($v >= 0x000E1000) && ($v <= 0x000EFFFD)) return true; |
||
| 570 | |||
| 571 | // Note: Rec. ITU-T X.660, clause 7.5.3 would also forbid ranges which are marked in ISO/IEC 10646 as "(This position shall not be used)" |
||
| 572 | // But tool implementers should be tolerate them, since these limitations can be removed in future. |
||
| 573 | |||
| 574 | return false; |
||
| 575 | } |
||
| 576 | |||
| 577 | function iri_arc_valid($arc, $allow_numeric=true) { |
||
| 578 | if ($arc == '') return false; |
||
| 579 | |||
| 580 | if ($allow_numeric && preg_match('@^(\\d+)$@', $arc, $m)) return true; # numeric arc |
||
| 581 | |||
| 582 | // Question: Should we strip RTL/LTR characters? |
||
| 583 | |||
| 584 | if (mb_substr($arc, 2, 2) == '--') return false; // see Rec. ITU-T X.660, clause 7.5.4 |
||
| 585 | |||
| 586 | $array = array(); |
||
| 587 | preg_match_all('/./u', $arc, $array, PREG_SET_ORDER); |
||
| 588 | $len = count($array); |
||
| 589 | foreach ($array as $i => $char) { |
||
| 590 | if (!iri_char_valid($char[0], $i==0, $i==$len-1)) return false; |
||
| 591 | } |
||
| 592 | |||
| 593 | return true; |
||
| 594 | } |
||
| 595 | |||
| 596 | /** |
||
| 597 | * Checks if an IRI identifier is valid or not. |
||
| 598 | * @author Daniel Marschall, ViaThinkSoft |
||
| 599 | * @version 2014-12-17 |
||
| 600 | * @param $iri (string)<br /> |
||
| 601 | * An OID in OID-IRI notation, e.g. /Example/test |
||
| 602 | * @return (bool) true if the IRI identifier is valid. |
||
| 603 | **/ |
||
| 604 | function iri_valid($iri) { |
||
| 605 | if ($iri == '/') return true; // OK? |
||
| 606 | |||
| 607 | if (substr($iri, 0, 1) != '/') return false; |
||
| 608 | |||
| 609 | $ary = explode('/', $iri); |
||
| 610 | array_shift($ary); |
||
| 611 | foreach ($ary as $a) { |
||
| 612 | if (!iri_arc_valid($a)) return false; |
||
| 613 | } |
||
| 614 | |||
| 615 | return true; |
||
| 616 | } |
||
| 617 | |||
| 618 | /* |
||
| 619 | assert(iri_arc_valid('ABCDEF')); |
||
| 620 | assert(!iri_arc_valid('-ABCDEF')); |
||
| 621 | assert(!iri_arc_valid('ABCDEF-')); |
||
| 622 | assert(!iri_arc_valid(' ABCDEF')); |
||
| 623 | assert(!iri_arc_valid('2 ABCDEF')); |
||
| 624 | assert(!iri_arc_valid('')); |
||
| 625 | |||
| 626 | assert(!iri_valid('')); |
||
| 627 | assert(iri_valid('/')); |
||
| 628 | assert(iri_valid('/hello/world')); |
||
| 629 | assert(iri_valid('/123/world')); |
||
| 630 | assert(!iri_valid('/hello/0world')); |
||
| 631 | assert(!iri_valid('/hello/xo--test')); |
||
| 632 | assert(!iri_valid('/hello/-super-/sd')); |
||
| 633 | */ |
||
| 634 | |||
| 635 | /** |
||
| 636 | * Returns an associative array in the form 'ASN.1' => '/2/1' . |
||
| 637 | * @author Daniel Marschall, ViaThinkSoft |
||
| 638 | * @version 2018-01-05 |
||
| 639 | * @see http://itu.int/go/X660 |
||
| 640 | * @return (array) An associative array in the form 'ASN.1' => '/2/1' . |
||
| 641 | **/ |
||
| 642 | function iri_get_long_arcs() { |
||
| 643 | $iri_long_arcs = array(); |
||
| 644 | $iri_long_arcs['ASN.1'] = '/2/1'; |
||
| 645 | $iri_long_arcs['Country'] = '/2/16'; |
||
| 646 | $iri_long_arcs['International-Organizations'] = '/2/23'; |
||
| 647 | $iri_long_arcs['UUID'] = '/2/25'; |
||
| 648 | $iri_long_arcs['Tag-Based'] = '/2/27'; |
||
| 649 | $iri_long_arcs['BIP'] = '/2/41'; |
||
| 650 | $iri_long_arcs['Telebiometrics'] = '/2/42'; |
||
| 651 | $iri_long_arcs['Cybersecurity'] = '/2/48'; |
||
| 652 | $iri_long_arcs['Alerting'] = '/2/49'; |
||
| 653 | $iri_long_arcs['OIDResolutionSystem'] = '/2/50'; |
||
| 654 | $iri_long_arcs['GS1'] = '/2/51'; |
||
| 655 | $iri_long_arcs['Example'] = '/2/999'; // English |
||
| 656 | $iri_long_arcs['Exemple'] = '/2/999'; // French |
||
| 657 | $iri_long_arcs['Ejemplo'] = '/2/999'; // Spanish |
||
| 658 | $iri_long_arcs["\u{0627}\u{0644}\u{0645}\u{062B}\u{0627}\u{0644}"] = '/2/999'; // Arabic |
||
| 659 | $iri_long_arcs["\u{8303}\u{4F8B}"] = '/2/999'; // Chinese |
||
| 660 | $iri_long_arcs["\u{041F}\u{0440}\u{0438}\u{043C}\u{0435}\u{0440}"] = '/2/999'; // Russian |
||
| 661 | $iri_long_arcs["\u{C608}\u{C81C}"] = '/2/999'; // Korean |
||
| 662 | $iri_long_arcs["\u{4F8B}"] = '/2/999'; // Japanese |
||
| 663 | $iri_long_arcs['Beispiel'] = '/2/999'; // German |
||
| 664 | return $iri_long_arcs; |
||
| 665 | } |
||
| 666 | |||
| 667 | /** |
||
| 668 | * Tries to shorten/simplify an IRI by applying "long arcs", e.g. /2/999/123 -> /Example/123 . |
||
| 669 | * @author Daniel Marschall, ViaThinkSoft |
||
| 12 | daniel-mar | 670 | * @version 2020-05-22 |
| 3 | daniel-mar | 671 | * @param $iri (string)<br /> |
| 672 | * An OID in OID-IRI notation, e.g. /Example/test |
||
| 673 | * @return (string) The modified IRI. |
||
| 674 | **/ |
||
| 675 | function iri_add_longarcs($iri) { |
||
| 676 | $iri_long_arcs = iri_get_long_arcs(); |
||
| 677 | |||
| 12 | daniel-mar | 678 | if (!iri_valid($iri)) return false; |
| 3 | daniel-mar | 679 | |
| 680 | $ary = explode('/', $iri); |
||
| 681 | |||
| 682 | $ary_number_iri = $ary; |
||
| 683 | if ($ary_number_iri[1] == 'Joint-ISO-ITU-T') $ary_number_iri[1] = '2'; |
||
| 12 | daniel-mar | 684 | |
| 3 | daniel-mar | 685 | $number_iri = implode('/', $ary_number_iri); |
| 686 | |||
| 687 | foreach ($iri_long_arcs as $cur_longarc => $cur_iri) { |
||
| 12 | daniel-mar | 688 | assert(iri_valid($cur_iri)); |
| 3 | daniel-mar | 689 | if (strpos($number_iri.'/', $cur_iri.'/') === 0) { |
| 690 | $cnt = substr_count($cur_iri, '/'); |
||
| 691 | for ($i=1; $i<$cnt; $i++) { |
||
| 692 | array_shift($ary); |
||
| 693 | } |
||
| 694 | $ary[0] = ''; |
||
| 695 | $ary[1] = $cur_longarc; |
||
| 696 | $iri = implode('/', $ary); |
||
| 697 | break; |
||
| 698 | } |
||
| 699 | } |
||
| 700 | |||
| 701 | return $iri; |
||
| 702 | } |
||
| 12 | daniel-mar | 703 | /* |
| 704 | assert(iri_add_longarcs('/2/999/123') === '/Example/123'); |
||
| 705 | */ |
||
| 3 | daniel-mar | 706 | |
| 707 | # === FUNCTIONS FOR OIDS IN ASN.1 NOTATION === |
||
| 708 | |||
| 709 | /** |
||
| 710 | * Checks if an ASN.1 identifier is valid. |
||
| 711 | * @author Daniel Marschall, ViaThinkSoft |
||
| 12 | daniel-mar | 712 | * @version 2020-05-22 |
| 3 | daniel-mar | 713 | * @param $id (string)<br /> |
| 714 | * An ASN.1 identifier, e.g. "example". Not "example(99)" or "99" and not a path like "{ 2 999 }" |
||
| 715 | * Note: Use asn1_path_valid() for validating a whole ASN.1 notation path. |
||
| 716 | * @return (bool) true, if the identifier is valid: It begins with an lowercase letter and contains only 0-9, a-z, A-Z and "-" |
||
| 717 | **/ |
||
| 718 | function oid_id_is_valid($id) { |
||
| 12 | daniel-mar | 719 | // see Rec. ITU-T X.660 | ISO/IEC 9834-1, clause 7.7 |
| 720 | // and Rec. ITU-T X.680 | ISO/IEC 8824-1, clause 12.3 |
||
| 721 | if (substr($id,-1,1) == '-') return false; |
||
| 722 | if (strstr($id,'--')) return false; |
||
| 723 | return preg_match('/^([a-z][a-zA-Z0-9-]*)$/', $id) != 0; |
||
| 3 | daniel-mar | 724 | } |
| 725 | |||
| 726 | /** |
||
| 727 | * Checks if the ASN.1 notation of an OID is valid. |
||
| 728 | * This function does not tolerate leading zeros. |
||
| 729 | * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} is not valid while { iso 123 } is valid. |
||
| 730 | * @author Daniel Marschall, ViaThinkSoft |
||
| 731 | * @version 2014-12-17 |
||
| 732 | * @param $asn (string)<br /> |
||
| 733 | * An OID in ASN.1 notation. |
||
| 734 | * @return (bools) true if the identifier is valid. |
||
| 735 | **/ |
||
| 736 | function asn1_path_valid($asn1) { |
||
| 737 | return asn1_to_dot($asn1) != false; |
||
| 738 | } |
||
| 739 | |||
| 740 | /** |
||
| 741 | * Returns an array of standardized ASN.1 alphanumeric identifiers which do not require a numeric identifier, e.g. { 2 example } |
||
| 742 | * The array has the form '0.0.a' -> '0.0.1' |
||
| 743 | * @author Daniel Marschall, ViaThinkSoft |
||
| 744 | * @version 2019-03-25 |
||
| 745 | * @see http://www.oid-info.com/name-forms.htm |
||
| 746 | * @return (array) Associative array of standardized ASN.1 alphanumeric identifiers |
||
| 747 | **/ |
||
| 748 | function asn1_get_standardized_array() { |
||
| 749 | |||
| 750 | // Taken from oid-info.com |
||
| 751 | // http://www.oid-info.com/name-forms.htm |
||
| 752 | $standardized = array(); |
||
| 753 | $standardized['itu-t'] = '0'; |
||
| 754 | $standardized['ccitt'] = '0'; |
||
| 755 | $standardized['iso'] = '1'; |
||
| 756 | $standardized['joint-iso-itu-t'] = '2'; |
||
| 757 | $standardized['joint-iso-ccitt'] = '2'; |
||
| 758 | $standardized['0.recommendation'] = '0.0'; |
||
| 759 | $standardized['0.0.a'] = '0.0.1'; |
||
| 760 | $standardized['0.0.b'] = '0.0.2'; |
||
| 761 | $standardized['0.0.c'] = '0.0.3'; |
||
| 762 | $standardized['0.0.d'] = '0.0.4'; |
||
| 763 | $standardized['0.0.e'] = '0.0.5'; |
||
| 764 | $standardized['0.0.f'] = '0.0.6'; |
||
| 765 | $standardized['0.0.g'] = '0.0.7'; |
||
| 766 | $standardized['0.0.h'] = '0.0.8'; |
||
| 767 | $standardized['0.0.i'] = '0.0.9'; |
||
| 768 | $standardized['0.0.j'] = '0.0.10'; |
||
| 769 | $standardized['0.0.k'] = '0.0.11'; |
||
| 770 | $standardized['0.0.l'] = '0.0.12'; |
||
| 771 | $standardized['0.0.m'] = '0.0.13'; |
||
| 772 | $standardized['0.0.n'] = '0.0.14'; |
||
| 773 | $standardized['0.0.o'] = '0.0.15'; |
||
| 774 | $standardized['0.0.p'] = '0.0.16'; |
||
| 775 | $standardized['0.0.q'] = '0.0.17'; |
||
| 776 | $standardized['0.0.r'] = '0.0.18'; |
||
| 777 | $standardized['0.0.s'] = '0.0.19'; |
||
| 778 | $standardized['0.0.t'] = '0.0.20'; |
||
| 779 | $standardized['0.0.u'] = '0.0.21'; |
||
| 780 | $standardized['0.0.v'] = '0.0.22'; |
||
| 781 | $standardized['0.0.w'] = '0.0.23'; // actually, this OID does not exist |
||
| 782 | $standardized['0.0.x'] = '0.0.24'; |
||
| 783 | $standardized['0.0.y'] = '0.0.25'; |
||
| 784 | $standardized['0.0.z'] = '0.0.26'; |
||
| 785 | $standardized['0.question'] = '0.1'; |
||
| 786 | $standardized['0.administration'] = '0.2'; |
||
| 787 | $standardized['0.network-operator'] = '0.3'; |
||
| 788 | $standardized['0.identified-organization'] = '0.4'; |
||
| 789 | $standardized['1.standard'] = '1.0'; |
||
| 790 | $standardized['1.registration-authority'] = '1.1'; |
||
| 791 | $standardized['1.member-body'] = '1.2'; |
||
| 792 | $standardized['1.identified-organization'] = '1.3'; |
||
| 793 | return $standardized; |
||
| 794 | } |
||
| 795 | |||
| 796 | /** |
||
| 797 | * Converts an OID in ASN.1 notation into an OID in dot notation and tries to resolve well-known identifiers.<br /> |
||
| 798 | * e.g. {joint-iso-itu-t(2) example(999) 1 2 3} --> 2.999.1.2.3<br /> |
||
| 799 | * e.g. {iso 3} --> 1.3 |
||
| 800 | * This function does not tolerate leading zeros. |
||
| 801 | * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} will not be resolved to 1.test |
||
| 802 | * @author Daniel Marschall, ViaThinkSoft |
||
| 803 | * @version 2014-12-17 |
||
| 804 | * @param $asn (string)<br /> |
||
| 805 | * An OID in ASN.1 notation. |
||
| 806 | * @return (string) An OID in dot notation without leading dot or false if the path is invalid. |
||
| 807 | **/ |
||
| 808 | function asn1_to_dot($asn) { |
||
| 809 | $standardized = asn1_get_standardized_array(); |
||
| 810 | |||
| 811 | // Clean up |
||
| 812 | $asn = preg_replace('@^\\{(.+)\\}$@', '\\1', $asn, -1, $count); |
||
| 813 | if ($count == 0) return false; // { and } are required. The asn.1 path will NOT be trimmed by this function |
||
| 814 | |||
| 815 | // If identifier is set, apply it (no check if it overrides a standardized identifier) |
||
| 816 | $asn = preg_replace('|\s*([a-z][a-zA-Z0-9-]*)\s*\((\d+)\)|', ' \\2', $asn); |
||
| 817 | $asn = trim($asn); |
||
| 818 | |||
| 819 | // Set dots |
||
| 820 | $asn = preg_replace('|\s+|', '.', $asn); |
||
| 821 | |||
| 822 | // Apply standardized identifiers (case sensitive) |
||
| 823 | $asn .= '.'; |
||
| 824 | foreach ($standardized as $s => $r) { |
||
| 825 | $asn = preg_replace("|^$s|", $r, $asn); |
||
| 826 | } |
||
| 827 | $asn = substr($asn, 0, strlen($asn)-1); |
||
| 828 | |||
| 829 | // Check if all numbers are OK |
||
| 830 | // -> every arc must be resolved |
||
| 831 | // -> numeric arcs must not have a leading zero |
||
| 832 | // -> invalid stuff will be recognized, e.g. a "(1)" without an identifier in front of it |
||
| 833 | $ary = explode('.', $asn); |
||
| 834 | foreach ($ary as $a) { |
||
| 835 | if (!preg_match('@^(0|([1-9]\\d*))$@', $a, $m)) return false; |
||
| 836 | } |
||
| 837 | |||
| 838 | return $asn; |
||
| 839 | } |
||
| 840 | |||
| 841 | /* |
||
| 842 | assert(asn1_to_dot('{2 999 (1)}') == false); |
||
| 843 | assert(asn1_to_dot('{2 999 test}') == false); |
||
| 844 | assert(asn1_to_dot('{2 999 1}') == '2.999.1'); |
||
| 845 | assert(asn1_to_dot(' {2 999 1} ') == false); |
||
| 846 | assert(asn1_to_dot('2 999 1') == false); |
||
| 847 | assert(asn1_to_dot('{2 999 01}') == false); |
||
| 848 | assert(asn1_to_dot('{ 0 question 123 }') == '0.1.123'); |
||
| 849 | assert(asn1_to_dot('{ iso }') == '1'); |
||
| 850 | assert(asn1_to_dot('{ iso(1) }') == '1'); |
||
| 851 | assert(asn1_to_dot('{ iso(2) }') == '2'); |
||
| 852 | assert(asn1_to_dot('{ iso 3 }') == '1.3'); |
||
| 853 | */ |
||
| 854 | |||
| 855 | /** |
||
| 12 | daniel-mar | 856 | * Gets the last numeric identifier of an ASN.1 notation OID. |
| 857 | * @author Daniel Marschall, ViaThinkSoft |
||
| 858 | * @version 2020-06-11 |
||
| 859 | * @param $asn1id (string)<br /> |
||
| 860 | * An ASN.1 identifier string, e.g. { 2 example(999) test(1) } |
||
| 861 | * @return (int) The last numeric identifier arc, e.g. "1" |
||
| 862 | **/ |
||
| 863 | function asn1_last_identifier($asn1id) { |
||
| 864 | $asn1id = preg_replace('@\(\s*\d+\s*\)@', '', $asn1id); |
||
| 865 | $asn1id = trim(str_replace(array('{', '}', "\t"), ' ', $asn1id)); |
||
| 866 | $ary = explode(' ', $asn1id); |
||
| 867 | $asn1id = $ary[count($ary)-1]; |
||
| 868 | return preg_match('#[^0-9]#',$asn1id) ? $asn1id : false; |
||
| 869 | } |
||
| 870 | |||
| 871 | /** |
||
| 3 | daniel-mar | 872 | * "Soft corrects" an invalid ASN.1 identifier.<br /> |
| 873 | * Attention, by "soft correcting" the ID, it is not authoritative anymore, and might not be able to be resolved by ORS. |
||
| 874 | * @author Daniel Marschall, ViaThinkSoft |
||
| 12 | daniel-mar | 875 | * @version 2020-05-22 |
| 3 | daniel-mar | 876 | * @param $id (string)<br /> |
| 877 | * An ASN.1 identifier. |
||
| 878 | * @param $append_id_prefix (bool)<br /> |
||
| 879 | * true (default): If the identifier doesn't start with a-Z, the problem will be solved by prepending "id-" to the identifier.<br /> |
||
| 880 | * false: If the identifier doesn't start with a-Z, then the problem cannot be solved (method returns empty string). |
||
| 881 | * @return (string) The "soft corrected" ASN.1 identifier.<br /> |
||
| 882 | * Invalid characters will be removed.<br /> |
||
| 883 | * Uncorrectable start elements (0-9 or "-") will be either removed or solved by prepending "id-" (see <code>$append_id_prefix</code>)<br /> |
||
| 884 | * If the identifier begins with an upper case letter, the letter will be converted into lower case. |
||
| 885 | **/ |
||
| 886 | function oid_soft_correct_id($id, $append_id_prefix = true) { |
||
| 887 | // Convert "_" to "-" |
||
| 888 | $id = str_replace('_', '-', $id); |
||
| 889 | |||
| 12 | daniel-mar | 890 | // Convert "--" to "-" |
| 891 | $id = str_replace('--', '-', $id); |
||
| 892 | |||
| 3 | daniel-mar | 893 | // Remove invalid characters |
| 894 | $id = preg_replace('/[^a-zA-Z0-9-]+/', '', $id); |
||
| 895 | |||
| 896 | // Remove uncorrectable start elements (0-9 or "-") |
||
| 897 | if ($append_id_prefix) { |
||
| 898 | $id = preg_replace('/^([^a-zA-Z]+)/', 'id-$1', $id); |
||
| 899 | } else { |
||
| 900 | $id = preg_replace('/^([^a-zA-Z]+)/', '', $id); |
||
| 901 | } |
||
| 902 | |||
| 903 | // "Correct" upper case beginning letter by converting it to lower case |
||
| 904 | if (preg_match('/^[A-Z]/', $id)) { |
||
| 905 | $id = strtolower($id[0]) . substr($id, 1); |
||
| 906 | } |
||
| 907 | |||
| 908 | return $id; |
||
| 909 | } |