98 |
99 |
100 |
101 |
104 |
105 |
--------------------------------------------------------------------------------
/api/class/url.php:
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1 | conn = $conn;
21 | $this->ifUserDefine = true; //是否用户自定义短链
22 | $this->AlreadyExists = false; //是否已经存在
23 | }
24 |
25 | /**
26 | * 获取短链对应的长链接
27 | * @param string $short
28 | * @return array
29 | */
30 | function getLongUrl(string $short): array
31 | {
32 | try {
33 | $sel = $this->conn->prepare("SELECT `url` FROM `shorter` WHERE `short` = ? ");
34 | $sel->execute([$short]);
35 | $res = $sel->fetch();
36 | if ($res) return ['code' => 0, 'msg' => 'success', 'url' => $res['url']];
37 | return ['code' => 404, 'msg' => 'not found', 'data' => ''];
38 | } catch (PDOException $e) {
39 | $arr = ['code' => 500, 'msg' => 'error', 'data' => ''];
40 | if (DEBUG) $arr['err'] = $e->getMessage();
41 | return $arr;
42 | }
43 | }
44 |
45 | /**
46 | * 生成短链接
47 | * @param string $url
48 | * @param string $short
49 | * @return array
50 | */
51 | public function getShort(string $url, string $short): array
52 | {
53 | // 判断是否已经存在
54 | try {
55 | //处理URL
56 | $url = $this->getUrl($url);
57 | if (!preg_match("/^http(s?):\/\/(?:[A-za-z0-9-]+\.)+[A-za-z]{2,4}+(\/){0,1}+(.*)$/", $url)) return ['code' => 1004, 'msg' => '非法的网址', 'url' => $url];
58 | if (mb_strlen($url) > 1500 || mb_strlen($url) < 10) return ['code' => 1005, 'msg' => '网址长度应该在10到1500位', 'url' => ''];
59 | if (!$short) $short = $this->createShort();
60 | if (!preg_match('/^[a-zA-Z0-9]{0,}$/', $short)) return ['code' => 1002, 'msg' => '短链接必须为字母,数字,组合', 'url' => ''];
61 | if (strlen($short) > 10 || strlen($short) < 4) return ['code' => 1003, 'msg' => '短链接长度必须在4-10位', 'url' => ''];
62 | if ($this->checkShort($url, $short)) return ['code' => 1006, 'msg' => '自定义短链接已存在', 'url' => ''];
63 | return ['code' => 0, 'msg' => 'success', 'url' => WEB_URL . $this->addShorter($url, trim($short))];
64 | } catch (Exception $e) {
65 | $arr = ['code' => 99999, 'msg' => '系统错误,请重试', 'url' => ''];
66 | if (DEBUG) $arr['err'] = $e->getMessage();
67 | return $arr;
68 | }
69 | }
70 |
71 | /**
72 | * 检测短链接是否存在
73 | * @param string $url
74 | * @param string $short
75 | * @return bool
76 | */
77 | public function checkShort(string $url, string $short): bool
78 | {
79 | $sel = $this->conn->prepare("SELECT `url` FROM `shorter` WHERE `short` = ? ");
80 | $sel->execute([$short]);
81 | $res = $sel->fetch();
82 | if (!$res) return false;
83 | if ($url == $res['url']) :
84 | $this->AlreadyExists = true;
85 | return false;
86 | endif;
87 | return true;
88 | }
89 |
90 | /**
91 | * 处理URL
92 | * @param string $url
93 | * @return string
94 | * @throws Exception
95 | */
96 | public function getUrl(string $url): string
97 | {
98 | $url = urldecode(trim($url));
99 | $urlArr = parse_url($url);
100 | if (!isset($urlArr['host'])) return 'Err';
101 | $Punycode = new Punycode();
102 | $urlArr['host'] = $Punycode->encode($urlArr['host']);
103 | $url = Tool::unparse_url($urlArr);
104 | return $url;
105 | }
106 |
107 | /**
108 | * 写入短链
109 | * @param string $url
110 | * @param string $short
111 | * @return string
112 | * @throws Exception
113 | */
114 | private function addShorter(string $url, string $short): string
115 | {
116 | if ($this->AlreadyExists) return $short;
117 | //检测是否已经存在
118 | if (!$this->ifUserDefine) {
119 | $sel = $this->conn->prepare("SELECT `short` FROM `shorter` WHERE `url` = ? ");
120 | $sel->execute([$url]);
121 | $res = $sel->fetch();
122 | if ($res) return $res['short'];
123 | }
124 | $insert = $this->conn->prepare("INSERT INTO `shorter` VALUES ('0', ? , ? , ? , ? )");
125 | $insert->execute([$short, $url, time(), Tool::getIp()]);
126 | if ($insert->rowCount() === 0) throw new \Exception('写入短链接失败');
127 | return $short;
128 | }
129 |
130 | /**
131 | * 生成短链
132 | * @return string
133 | */
134 | private function createShort(): string
135 | {
136 | while (True) { //重复检测
137 | $short = Tool::randStr(is_numeric(SHORT_LEN) ? SHORT_LEN : mt_rand(4, 6));
138 | $checkIfExists = $this->conn->prepare("SELECT * FROM `shorter` WHERE `short` = :short ");
139 | $checkIfExists->bindParam(':short', $short);
140 | $checkIfExists->execute();
141 | if ($checkIfExists->rowCount() == 0) break;
142 | }
143 | $this->ifUserDefine = false;
144 | return $short;
145 | }
146 | }
147 |
--------------------------------------------------------------------------------
/api/class/punycode/Punycode.php:
--------------------------------------------------------------------------------
1 | 0, 'b' => 1, 'c' => 2, 'd' => 3, 'e' => 4, 'f' => 5,
44 | 'g' => 6, 'h' => 7, 'i' => 8, 'j' => 9, 'k' => 10, 'l' => 11,
45 | 'm' => 12, 'n' => 13, 'o' => 14, 'p' => 15, 'q' => 16, 'r' => 17,
46 | 's' => 18, 't' => 19, 'u' => 20, 'v' => 21, 'w' => 22, 'x' => 23,
47 | 'y' => 24, 'z' => 25, '0' => 26, '1' => 27, '2' => 28, '3' => 29,
48 | '4' => 30, '5' => 31, '6' => 32, '7' => 33, '8' => 34, '9' => 35
49 | );
50 |
51 | /**
52 | * Character encoding
53 | *
54 | * @param string
55 | */
56 | protected $encoding;
57 |
58 | /**
59 | * Constructor
60 | *
61 | * @param string $encoding Character encoding
62 | */
63 | public function __construct($encoding = 'UTF-8')
64 | {
65 | $this->encoding = $encoding;
66 | }
67 |
68 | /**
69 | * Encode a domain to its Punycode version
70 | *
71 | * @param string $input Domain name in Unicode to be encoded
72 | * @return string Punycode representation in ASCII
73 | */
74 | public function encode($input)
75 | {
76 | $input = mb_strtolower($input, $this->encoding);
77 | $parts = explode('.', $input);
78 | foreach ($parts as &$part) {
79 | $length = strlen($part);
80 | if ($length < 1) {
81 | throw new \Exception(sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
82 | }
83 | $part = $this->encodePart($part);
84 | }
85 | $output = implode('.', $parts);
86 | $length = strlen($output);
87 | if ($length > 255) {
88 | throw new \Exception(sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));
89 | }
90 |
91 | return $output;
92 | }
93 |
94 | /**
95 | * Encode a part of a domain name, such as tld, to its Punycode version
96 | *
97 | * @param string $input Part of a domain name
98 | * @return string Punycode representation of a domain part
99 | */
100 | protected function encodePart($input)
101 | {
102 | $codePoints = $this->listCodePoints($input);
103 |
104 | $n = static::INITIAL_N;
105 | $bias = static::INITIAL_BIAS;
106 | $delta = 0;
107 | $h = $b = count($codePoints['basic']);
108 |
109 | $output = '';
110 | foreach ($codePoints['basic'] as $code) {
111 | $output .= $this->codePointToChar($code);
112 | }
113 | if ($input === $output) {
114 | return $output;
115 | }
116 | if ($b > 0) {
117 | $output .= static::DELIMITER;
118 | }
119 |
120 | $codePoints['nonBasic'] = array_unique($codePoints['nonBasic']);
121 | sort($codePoints['nonBasic']);
122 |
123 | $i = 0;
124 | $length = mb_strlen($input, $this->encoding);
125 | while ($h < $length) {
126 | $m = $codePoints['nonBasic'][$i++];
127 | $delta = $delta + ($m - $n) * ($h + 1);
128 | $n = $m;
129 |
130 | foreach ($codePoints['all'] as $c) {
131 | if ($c < $n || $c < static::INITIAL_N) {
132 | $delta++;
133 | }
134 | if ($c === $n) {
135 | $q = $delta;
136 | for ($k = static::BASE;; $k += static::BASE) {
137 | $t = $this->calculateThreshold($k, $bias);
138 | if ($q < $t) {
139 | break;
140 | }
141 |
142 | $code = $t + (($q - $t) % (static::BASE - $t));
143 | $output .= static::$encodeTable[$code];
144 |
145 | $q = ($q - $t) / (static::BASE - $t);
146 | }
147 |
148 | $output .= static::$encodeTable[$q];
149 | $bias = $this->adapt($delta, $h + 1, ($h === $b));
150 | $delta = 0;
151 | $h++;
152 | }
153 | }
154 |
155 | $delta++;
156 | $n++;
157 | }
158 | $out = static::PREFIX . $output;
159 | $length = strlen($out);
160 | if ($length > 63 || $length < 1) {
161 | throw new \Exception(sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
162 | }
163 |
164 | return $out;
165 | }
166 |
167 | /**
168 | * Decode a Punycode domain name to its Unicode counterpart
169 | *
170 | * @param string $input Domain name in Punycode
171 | * @return string Unicode domain name
172 | */
173 | public function decode($input)
174 | {
175 | $input = strtolower($input);
176 | $parts = explode('.', $input);
177 | foreach ($parts as &$part) {
178 | $length = strlen($part);
179 | if ($length > 63 || $length < 1) {
180 | throw new \Exception(sprintf('The length of any one label is limited to between 1 and 63 octets, but %s given.', $length));
181 | }
182 | if (strpos($part, static::PREFIX) !== 0) {
183 | continue;
184 | }
185 |
186 | $part = substr($part, strlen(static::PREFIX));
187 | $part = $this->decodePart($part);
188 | }
189 | $output = implode('.', $parts);
190 | $length = strlen($output);
191 | if ($length > 255) {
192 | throw new \Exception(sprintf('A full domain name is limited to 255 octets (including the separators), %s given.', $length));
193 | }
194 |
195 | return $output;
196 | }
197 |
198 | /**
199 | * Decode a part of domain name, such as tld
200 | *
201 | * @param string $input Part of a domain name
202 | * @return string Unicode domain part
203 | */
204 | protected function decodePart($input)
205 | {
206 | $n = static::INITIAL_N;
207 | $i = 0;
208 | $bias = static::INITIAL_BIAS;
209 | $output = '';
210 |
211 | $pos = strrpos($input, static::DELIMITER);
212 | if ($pos !== false) {
213 | $output = substr($input, 0, $pos++);
214 | } else {
215 | $pos = 0;
216 | }
217 |
218 | $outputLength = strlen($output);
219 | $inputLength = strlen($input);
220 | while ($pos < $inputLength) {
221 | $oldi = $i;
222 | $w = 1;
223 |
224 | for ($k = static::BASE;; $k += static::BASE) {
225 | $digit = static::$decodeTable[$input[$pos++]];
226 | $i = $i + ($digit * $w);
227 | $t = $this->calculateThreshold($k, $bias);
228 |
229 | if ($digit < $t) {
230 | break;
231 | }
232 |
233 | $w = $w * (static::BASE - $t);
234 | }
235 |
236 | $bias = $this->adapt($i - $oldi, ++$outputLength, ($oldi === 0));
237 | $n = $n + (int) ($i / $outputLength);
238 | $i = $i % ($outputLength);
239 | $output = mb_substr($output, 0, $i, $this->encoding) . $this->codePointToChar($n) . mb_substr($output, $i, $outputLength - 1, $this->encoding);
240 |
241 | $i++;
242 | }
243 |
244 | return $output;
245 | }
246 |
247 | /**
248 | * Calculate the bias threshold to fall between TMIN and TMAX
249 | *
250 | * @param integer $k
251 | * @param integer $bias
252 | * @return integer
253 | */
254 | protected function calculateThreshold($k, $bias)
255 | {
256 | if ($k <= $bias + static::TMIN) {
257 | return static::TMIN;
258 | } elseif ($k >= $bias + static::TMAX) {
259 | return static::TMAX;
260 | }
261 | return $k - $bias;
262 | }
263 |
264 | /**
265 | * Bias adaptation
266 | *
267 | * @param integer $delta
268 | * @param integer $numPoints
269 | * @param boolean $firstTime
270 | * @return integer
271 | */
272 | protected function adapt($delta, $numPoints, $firstTime)
273 | {
274 | $delta = (int) (
275 | ($firstTime)
276 | ? $delta / static::DAMP
277 | : $delta / 2
278 | );
279 | $delta += (int) ($delta / $numPoints);
280 |
281 | $k = 0;
282 | while ($delta > ((static::BASE - static::TMIN) * static::TMAX) / 2) {
283 | $delta = (int) ($delta / (static::BASE - static::TMIN));
284 | $k = $k + static::BASE;
285 | }
286 | $k = $k + (int) (((static::BASE - static::TMIN + 1) * $delta) / ($delta + static::SKEW));
287 |
288 | return $k;
289 | }
290 |
291 | /**
292 | * List code points for a given input
293 | *
294 | * @param string $input
295 | * @return array Multi-dimension array with basic, non-basic and aggregated code points
296 | */
297 | protected function listCodePoints($input)
298 | {
299 | $codePoints = array(
300 | 'all' => array(),
301 | 'basic' => array(),
302 | 'nonBasic' => array(),
303 | );
304 |
305 | $length = mb_strlen($input, $this->encoding);
306 | for ($i = 0; $i < $length; $i++) {
307 | $char = mb_substr($input, $i, 1, $this->encoding);
308 | $code = $this->charToCodePoint($char);
309 | if ($code < 128) {
310 | $codePoints['all'][] = $codePoints['basic'][] = $code;
311 | } else {
312 | $codePoints['all'][] = $codePoints['nonBasic'][] = $code;
313 | }
314 | }
315 |
316 | return $codePoints;
317 | }
318 |
319 | /**
320 | * Convert a single or multi-byte character to its code point
321 | *
322 | * @param string $char
323 | * @return integer
324 | */
325 | protected function charToCodePoint($char)
326 | {
327 | $code = ord($char[0]);
328 | if ($code < 128) {
329 | return $code;
330 | } elseif ($code < 224) {
331 | return (($code - 192) * 64) + (ord($char[1]) - 128);
332 | } elseif ($code < 240) {
333 | return (($code - 224) * 4096) + ((ord($char[1]) - 128) * 64) + (ord($char[2]) - 128);
334 | } else {
335 | return (($code - 240) * 262144) + ((ord($char[1]) - 128) * 4096) + ((ord($char[2]) - 128) * 64) + (ord($char[3]) - 128);
336 | }
337 | }
338 |
339 | /**
340 | * Convert a code point to its single or multi-byte character
341 | *
342 | * @param integer $code
343 | * @return string
344 | */
345 | protected function codePointToChar($code)
346 | {
347 | if ($code <= 0x7F) {
348 | return chr($code);
349 | } elseif ($code <= 0x7FF) {
350 | return chr(($code >> 6) + 192) . chr(($code & 63) + 128);
351 | } elseif ($code <= 0xFFFF) {
352 | return chr(($code >> 12) + 224) . chr((($code >> 6) & 63) + 128) . chr(($code & 63) + 128);
353 | } else {
354 | return chr(($code >> 18) + 240) . chr((($code >> 12) & 63) + 128) . chr((($code >> 6) & 63) + 128) . chr(($code & 63) + 128);
355 | }
356 | }
357 | }
358 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
1 | GNU GENERAL PUBLIC LICENSE
2 | Version 3, 29 June 2007
3 |
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191 | modification of the work as a means of enforcing, against the work's
192 | users, your or third parties' legal rights to forbid circumvention of
193 | technological measures.
194 |
195 | 4. Conveying Verbatim Copies.
196 |
197 | You may convey verbatim copies of the Program's source code as you
198 | receive it, in any medium, provided that you conspicuously and
199 | appropriately publish on each copy an appropriate copyright notice;
200 | keep intact all notices stating that this License and any
201 | non-permissive terms added in accord with section 7 apply to the code;
202 | keep intact all notices of the absence of any warranty; and give all
203 | recipients a copy of this License along with the Program.
204 |
205 | You may charge any price or no price for each copy that you convey,
206 | and you may offer support or warranty protection for a fee.
207 |
208 | 5. Conveying Modified Source Versions.
209 |
210 | You may convey a work based on the Program, or the modifications to
211 | produce it from the Program, in the form of source code under the
212 | terms of section 4, provided that you also meet all of these conditions:
213 |
214 | a) The work must carry prominent notices stating that you modified
215 | it, and giving a relevant date.
216 |
217 | b) The work must carry prominent notices stating that it is
218 | released under this License and any conditions added under section
219 | 7. This requirement modifies the requirement in section 4 to
220 | "keep intact all notices".
221 |
222 | c) You must license the entire work, as a whole, under this
223 | License to anyone who comes into possession of a copy. This
224 | License will therefore apply, along with any applicable section 7
225 | additional terms, to the whole of the work, and all its parts,
226 | regardless of how they are packaged. This License gives no
227 | permission to license the work in any other way, but it does not
228 | invalidate such permission if you have separately received it.
229 |
230 | d) If the work has interactive user interfaces, each must display
231 | Appropriate Legal Notices; however, if the Program has interactive
232 | interfaces that do not display Appropriate Legal Notices, your
233 | work need not make them do so.
234 |
235 | A compilation of a covered work with other separate and independent
236 | works, which are not by their nature extensions of the covered work,
237 | and which are not combined with it such as to form a larger program,
238 | in or on a volume of a storage or distribution medium, is called an
239 | "aggregate" if the compilation and its resulting copyright are not
240 | used to limit the access or legal rights of the compilation's users
241 | beyond what the individual works permit. Inclusion of a covered work
242 | in an aggregate does not cause this License to apply to the other
243 | parts of the aggregate.
244 |
245 | 6. Conveying Non-Source Forms.
246 |
247 | You may convey a covered work in object code form under the terms
248 | of sections 4 and 5, provided that you also convey the
249 | machine-readable Corresponding Source under the terms of this License,
250 | in one of these ways:
251 |
252 | a) Convey the object code in, or embodied in, a physical product
253 | (including a physical distribution medium), accompanied by the
254 | Corresponding Source fixed on a durable physical medium
255 | customarily used for software interchange.
256 |
257 | b) Convey the object code in, or embodied in, a physical product
258 | (including a physical distribution medium), accompanied by a
259 | written offer, valid for at least three years and valid for as
260 | long as you offer spare parts or customer support for that product
261 | model, to give anyone who possesses the object code either (1) a
262 | copy of the Corresponding Source for all the software in the
263 | product that is covered by this License, on a durable physical
264 | medium customarily used for software interchange, for a price no
265 | more than your reasonable cost of physically performing this
266 | conveying of source, or (2) access to copy the
267 | Corresponding Source from a network server at no charge.
268 |
269 | c) Convey individual copies of the object code with a copy of the
270 | written offer to provide the Corresponding Source. This
271 | alternative is allowed only occasionally and noncommercially, and
272 | only if you received the object code with such an offer, in accord
273 | with subsection 6b.
274 |
275 | d) Convey the object code by offering access from a designated
276 | place (gratis or for a charge), and offer equivalent access to the
277 | Corresponding Source in the same way through the same place at no
278 | further charge. You need not require recipients to copy the
279 | Corresponding Source along with the object code. If the place to
280 | copy the object code is a network server, the Corresponding Source
281 | may be on a different server (operated by you or a third party)
282 | that supports equivalent copying facilities, provided you maintain
283 | clear directions next to the object code saying where to find the
284 | Corresponding Source. Regardless of what server hosts the
285 | Corresponding Source, you remain obligated to ensure that it is
286 | available for as long as needed to satisfy these requirements.
287 |
288 | e) Convey the object code using peer-to-peer transmission, provided
289 | you inform other peers where the object code and Corresponding
290 | Source of the work are being offered to the general public at no
291 | charge under subsection 6d.
292 |
293 | A separable portion of the object code, whose source code is excluded
294 | from the Corresponding Source as a System Library, need not be
295 | included in conveying the object code work.
296 |
297 | A "User Product" is either (1) a "consumer product", which means any
298 | tangible personal property which is normally used for personal, family,
299 | or household purposes, or (2) anything designed or sold for incorporation
300 | into a dwelling. In determining whether a product is a consumer product,
301 | doubtful cases shall be resolved in favor of coverage. For a particular
302 | product received by a particular user, "normally used" refers to a
303 | typical or common use of that class of product, regardless of the status
304 | of the particular user or of the way in which the particular user
305 | actually uses, or expects or is expected to use, the product. A product
306 | is a consumer product regardless of whether the product has substantial
307 | commercial, industrial or non-consumer uses, unless such uses represent
308 | the only significant mode of use of the product.
309 |
310 | "Installation Information" for a User Product means any methods,
311 | procedures, authorization keys, or other information required to install
312 | and execute modified versions of a covered work in that User Product from
313 | a modified version of its Corresponding Source. The information must
314 | suffice to ensure that the continued functioning of the modified object
315 | code is in no case prevented or interfered with solely because
316 | modification has been made.
317 |
318 | If you convey an object code work under this section in, or with, or
319 | specifically for use in, a User Product, and the conveying occurs as
320 | part of a transaction in which the right of possession and use of the
321 | User Product is transferred to the recipient in perpetuity or for a
322 | fixed term (regardless of how the transaction is characterized), the
323 | Corresponding Source conveyed under this section must be accompanied
324 | by the Installation Information. But this requirement does not apply
325 | if neither you nor any third party retains the ability to install
326 | modified object code on the User Product (for example, the work has
327 | been installed in ROM).
328 |
329 | The requirement to provide Installation Information does not include a
330 | requirement to continue to provide support service, warranty, or updates
331 | for a work that has been modified or installed by the recipient, or for
332 | the User Product in which it has been modified or installed. Access to a
333 | network may be denied when the modification itself materially and
334 | adversely affects the operation of the network or violates the rules and
335 | protocols for communication across the network.
336 |
337 | Corresponding Source conveyed, and Installation Information provided,
338 | in accord with this section must be in a format that is publicly
339 | documented (and with an implementation available to the public in
340 | source code form), and must require no special password or key for
341 | unpacking, reading or copying.
342 |
343 | 7. Additional Terms.
344 |
345 | "Additional permissions" are terms that supplement the terms of this
346 | License by making exceptions from one or more of its conditions.
347 | Additional permissions that are applicable to the entire Program shall
348 | be treated as though they were included in this License, to the extent
349 | that they are valid under applicable law. If additional permissions
350 | apply only to part of the Program, that part may be used separately
351 | under those permissions, but the entire Program remains governed by
352 | this License without regard to the additional permissions.
353 |
354 | When you convey a copy of a covered work, you may at your option
355 | remove any additional permissions from that copy, or from any part of
356 | it. (Additional permissions may be written to require their own
357 | removal in certain cases when you modify the work.) You may place
358 | additional permissions on material, added by you to a covered work,
359 | for which you have or can give appropriate copyright permission.
360 |
361 | Notwithstanding any other provision of this License, for material you
362 | add to a covered work, you may (if authorized by the copyright holders of
363 | that material) supplement the terms of this License with terms:
364 |
365 | a) Disclaiming warranty or limiting liability differently from the
366 | terms of sections 15 and 16 of this License; or
367 |
368 | b) Requiring preservation of specified reasonable legal notices or
369 | author attributions in that material or in the Appropriate Legal
370 | Notices displayed by works containing it; or
371 |
372 | c) Prohibiting misrepresentation of the origin of that material, or
373 | requiring that modified versions of such material be marked in
374 | reasonable ways as different from the original version; or
375 |
376 | d) Limiting the use for publicity purposes of names of licensors or
377 | authors of the material; or
378 |
379 | e) Declining to grant rights under trademark law for use of some
380 | trade names, trademarks, or service marks; or
381 |
382 | f) Requiring indemnification of licensors and authors of that
383 | material by anyone who conveys the material (or modified versions of
384 | it) with contractual assumptions of liability to the recipient, for
385 | any liability that these contractual assumptions directly impose on
386 | those licensors and authors.
387 |
388 | All other non-permissive additional terms are considered "further
389 | restrictions" within the meaning of section 10. If the Program as you
390 | received it, or any part of it, contains a notice stating that it is
391 | governed by this License along with a term that is a further
392 | restriction, you may remove that term. If a license document contains
393 | a further restriction but permits relicensing or conveying under this
394 | License, you may add to a covered work material governed by the terms
395 | of that license document, provided that the further restriction does
396 | not survive such relicensing or conveying.
397 |
398 | If you add terms to a covered work in accord with this section, you
399 | must place, in the relevant source files, a statement of the
400 | additional terms that apply to those files, or a notice indicating
401 | where to find the applicable terms.
402 |
403 | Additional terms, permissive or non-permissive, may be stated in the
404 | form of a separately written license, or stated as exceptions;
405 | the above requirements apply either way.
406 |
407 | 8. Termination.
408 |
409 | You may not propagate or modify a covered work except as expressly
410 | provided under this License. Any attempt otherwise to propagate or
411 | modify it is void, and will automatically terminate your rights under
412 | this License (including any patent licenses granted under the third
413 | paragraph of section 11).
414 |
415 | However, if you cease all violation of this License, then your
416 | license from a particular copyright holder is reinstated (a)
417 | provisionally, unless and until the copyright holder explicitly and
418 | finally terminates your license, and (b) permanently, if the copyright
419 | holder fails to notify you of the violation by some reasonable means
420 | prior to 60 days after the cessation.
421 |
422 | Moreover, your license from a particular copyright holder is
423 | reinstated permanently if the copyright holder notifies you of the
424 | violation by some reasonable means, this is the first time you have
425 | received notice of violation of this License (for any work) from that
426 | copyright holder, and you cure the violation prior to 30 days after
427 | your receipt of the notice.
428 |
429 | Termination of your rights under this section does not terminate the
430 | licenses of parties who have received copies or rights from you under
431 | this License. If your rights have been terminated and not permanently
432 | reinstated, you do not qualify to receive new licenses for the same
433 | material under section 10.
434 |
435 | 9. Acceptance Not Required for Having Copies.
436 |
437 | You are not required to accept this License in order to receive or
438 | run a copy of the Program. Ancillary propagation of a covered work
439 | occurring solely as a consequence of using peer-to-peer transmission
440 | to receive a copy likewise does not require acceptance. However,
441 | nothing other than this License grants you permission to propagate or
442 | modify any covered work. These actions infringe copyright if you do
443 | not accept this License. Therefore, by modifying or propagating a
444 | covered work, you indicate your acceptance of this License to do so.
445 |
446 | 10. Automatic Licensing of Downstream Recipients.
447 |
448 | Each time you convey a covered work, the recipient automatically
449 | receives a license from the original licensors, to run, modify and
450 | propagate that work, subject to this License. You are not responsible
451 | for enforcing compliance by third parties with this License.
452 |
453 | An "entity transaction" is a transaction transferring control of an
454 | organization, or substantially all assets of one, or subdividing an
455 | organization, or merging organizations. If propagation of a covered
456 | work results from an entity transaction, each party to that
457 | transaction who receives a copy of the work also receives whatever
458 | licenses to the work the party's predecessor in interest had or could
459 | give under the previous paragraph, plus a right to possession of the
460 | Corresponding Source of the work from the predecessor in interest, if
461 | the predecessor has it or can get it with reasonable efforts.
462 |
463 | You may not impose any further restrictions on the exercise of the
464 | rights granted or affirmed under this License. For example, you may
465 | not impose a license fee, royalty, or other charge for exercise of
466 | rights granted under this License, and you may not initiate litigation
467 | (including a cross-claim or counterclaim in a lawsuit) alleging that
468 | any patent claim is infringed by making, using, selling, offering for
469 | sale, or importing the Program or any portion of it.
470 |
471 | 11. Patents.
472 |
473 | A "contributor" is a copyright holder who authorizes use under this
474 | License of the Program or a work on which the Program is based. The
475 | work thus licensed is called the contributor's "contributor version".
476 |
477 | A contributor's "essential patent claims" are all patent claims
478 | owned or controlled by the contributor, whether already acquired or
479 | hereafter acquired, that would be infringed by some manner, permitted
480 | by this License, of making, using, or selling its contributor version,
481 | but do not include claims that would be infringed only as a
482 | consequence of further modification of the contributor version. For
483 | purposes of this definition, "control" includes the right to grant
484 | patent sublicenses in a manner consistent with the requirements of
485 | this License.
486 |
487 | Each contributor grants you a non-exclusive, worldwide, royalty-free
488 | patent license under the contributor's essential patent claims, to
489 | make, use, sell, offer for sale, import and otherwise run, modify and
490 | propagate the contents of its contributor version.
491 |
492 | In the following three paragraphs, a "patent license" is any express
493 | agreement or commitment, however denominated, not to enforce a patent
494 | (such as an express permission to practice a patent or covenant not to
495 | sue for patent infringement). To "grant" such a patent license to a
496 | party means to make such an agreement or commitment not to enforce a
497 | patent against the party.
498 |
499 | If you convey a covered work, knowingly relying on a patent license,
500 | and the Corresponding Source of the work is not available for anyone
501 | to copy, free of charge and under the terms of this License, through a
502 | publicly available network server or other readily accessible means,
503 | then you must either (1) cause the Corresponding Source to be so
504 | available, or (2) arrange to deprive yourself of the benefit of the
505 | patent license for this particular work, or (3) arrange, in a manner
506 | consistent with the requirements of this License, to extend the patent
507 | license to downstream recipients. "Knowingly relying" means you have
508 | actual knowledge that, but for the patent license, your conveying the
509 | covered work in a country, or your recipient's use of the covered work
510 | in a country, would infringe one or more identifiable patents in that
511 | country that you have reason to believe are valid.
512 |
513 | If, pursuant to or in connection with a single transaction or
514 | arrangement, you convey, or propagate by procuring conveyance of, a
515 | covered work, and grant a patent license to some of the parties
516 | receiving the covered work authorizing them to use, propagate, modify
517 | or convey a specific copy of the covered work, then the patent license
518 | you grant is automatically extended to all recipients of the covered
519 | work and works based on it.
520 |
521 | A patent license is "discriminatory" if it does not include within
522 | the scope of its coverage, prohibits the exercise of, or is
523 | conditioned on the non-exercise of one or more of the rights that are
524 | specifically granted under this License. You may not convey a covered
525 | work if you are a party to an arrangement with a third party that is
526 | in the business of distributing software, under which you make payment
527 | to the third party based on the extent of your activity of conveying
528 | the work, and under which the third party grants, to any of the
529 | parties who would receive the covered work from you, a discriminatory
530 | patent license (a) in connection with copies of the covered work
531 | conveyed by you (or copies made from those copies), or (b) primarily
532 | for and in connection with specific products or compilations that
533 | contain the covered work, unless you entered into that arrangement,
534 | or that patent license was granted, prior to 28 March 2007.
535 |
536 | Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 |
540 | 12. No Surrender of Others' Freedom.
541 |
542 | If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License. If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all. For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 |
552 | 13. Use with the GNU Affero General Public License.
553 |
554 | Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 | Copyright 2022 xcsoft
635 |
636 | This program is free software: you can redistribute it and/or modify
637 | it under the terms of the GNU General Public License as published by
638 | the Free Software Foundation, either version 3 of the License, or
639 | (at your option) any later version.
640 |
641 | This program is distributed in the hope that it will be useful,
642 | but WITHOUT ANY WARRANTY; without even the implied warranty of
643 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
644 | GNU General Public License for more details.
645 |
646 | You should have received a copy of the GNU General Public License
647 | along with this program. If not, see .
648 |
649 | Also add information on how to contact you by electronic and paper mail.
650 |
651 | If the program does terminal interaction, make it output a short
652 | notice like this when it starts in an interactive mode:
653 |
654 | Urlshorter Copyright 2022 xcsoft
655 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
656 | This is free software, and you are welcome to redistribute it
657 | under certain conditions; type `show c' for details.
658 |
659 | The hypothetical commands `show w' and `show c' should show the appropriate
660 | parts of the General Public License. Of course, your program's commands
661 | might be different; for a GUI interface, you would use an "about box".
662 |
663 | You should also get your employer (if you work as a programmer) or school,
664 | if any, to sign a "copyright disclaimer" for the program, if necessary.
665 | For more information on this, and how to apply and follow the GNU GPL, see
666 | .
667 |
668 | The GNU General Public License does not permit incorporating your program
669 | into proprietary programs. If your program is a subroutine library, you
670 | may consider it more useful to permit linking proprietary applications with
671 | the library. If this is what you want to do, use the GNU Lesser General
672 | Public License instead of this License. But first, please read
673 | .
674 |
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