feat(problem/remote): add uoj

web/app/controllers/new_remote_problem.php

@@ -35,6 +35,14 @@ $new_remote_problem_form->addInput('remote_problem_id', [
 
 			$vdata['remote_problem_id'] = $id;
 
+			return '';
+		} elseif ($remote_oj === 'uoj') {
+			if (!validateUInt($id)) {
+				return '不合法的题目 ID';
+			}
+
+			$vdata['remote_problem_id'] = $id;
+
 			return '';
 		}
 

web/app/libs/uoj-utility-lib.php

@@ -218,3 +218,66 @@ function retry_loop(callable $f, $retry = 5, $ms = 10) {
 	}
 	return $ret;
 }
+
+function getAbsoluteUrl($relativeUrl, $baseUrl) {
+	// if already absolute URL 
+	if (parse_url($relativeUrl, PHP_URL_SCHEME) !== null) {
+		return $relativeUrl;
+	}
+
+	// queries and anchors
+	if ($relativeUrl[0] === '#' || $relativeUrl[0] === '?') {
+		return $baseUrl . $relativeUrl;
+	}
+
+	// parse base URL and convert to: $scheme, $host, $path, $query, $port, $user, $pass
+	extract(parse_url($baseUrl));
+
+	// if base URL contains a path remove non-directory elements from $path
+	if (isset($path) === true) {
+		$path = preg_replace('#/[^/]*$#', '', $path);
+	} else {
+		$path = '';
+	}
+
+	// if realtive URL starts with //
+	if (substr($relativeUrl, 0, 2) === '//') {
+		return $scheme . ':' . $relativeUrl;
+	}
+
+	// if realtive URL starts with /
+	if ($relativeUrl[0] === '/') {
+		$path = null;
+	}
+
+	$abs = null;
+
+	// if realtive URL contains a user
+	if (isset($user) === true) {
+		$abs .= $user;
+
+		// if realtive URL contains a password
+		if (isset($pass) === true) {
+			$abs .= ':' . $pass;
+		}
+
+		$abs .= '@';
+	}
+
+	$abs .= $host;
+
+	// if realtive URL contains a port
+	if (isset($port) === true) {
+		$abs .= ':' . $port;
+	}
+
+	$abs .= $path . '/' . $relativeUrl . (isset($query) === true ? '?' . $query : null);
+
+	// replace // or /./ or /foo/../ with /
+	$re = ['#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#'];
+	for ($n = 1; $n > 0; $abs = preg_replace($re, '/', $abs, -1, $n)) {
+	}
+
+	// return absolute URL
+	return $scheme . '://' . $abs;
+}

web/app/models/UOJRemoteProblem.php

@@ -23,6 +23,15 @@ class UOJRemoteProblem {
 			],
 			'languages' => ['C', 'C++', 'Java11', 'Python3', 'Pascal'],
 		],
+		'uoj' => [
+			'name' => 'UniversalOJ',
+			'short_name' => 'UOJ',
+			'url' => 'https://uoj.ac',
+			'not_exist_texts' => [
+				'未找到该页面',
+			],
+			'languages' => ['C', 'C++03', 'C++11', 'C++14', 'C++17', 'C++20', 'Python3', 'Python2.7', 'Java8', 'Java11', 'Java17', 'Pascal'],
+		],
 	];
 
 	static function getCodeforcesProblemUrl($id) {
@@ -45,6 +54,10 @@ class UOJRemoteProblem {
 		}, $id);
 	}
 
+	static function getUojProblemUrl($id) {
+		return static::$providers['uoj']['url'] . '/problem/' . $id;
+	}
+
 	static function getCodeforcesProblemBasicInfoFromHtml($id, $html) {
 		$remote_provider = static::$providers['codeforces'];
 
@@ -273,11 +286,59 @@ class UOJRemoteProblem {
 		];
 	}
 
+	static function getUojProblemBasicInfo($id) {
+		$remote_provider = static::$providers['uoj'];
+		$curl = new Curl();
+		$curl->setUserAgent('Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.0.0 Safari/537.36 S2OJ/3.1.0');
+
+		$res = retry_loop(function () use (&$curl, $id) {
+			$curl->get(static::getUojProblemUrl($id));
+
+			if ($curl->error) {
+				return false;
+			}
+
+			return $curl->response;
+		});
+
+		if (!$res) return null;
+
+		$dom = new \IvoPetkov\HTML5DOMDocument();
+		$dom->loadHTML($res);
+
+		$title_dom = $dom->querySelector('.page-header');
+		$title_matches = [];
+		preg_match('/^#[1-9][0-9]*\. (.*)$/', trim($title_dom->textContent), $title_matches);
+		$title = "【{$remote_provider['short_name']}{$id}】{$title_matches[1]}";
+
+		$statement_dom = $dom->querySelector('.uoj-article');
+		$statement = HTML::tag('h3', [], '题目描述');
+
+		foreach ($statement_dom->querySelectorAll('a') as &$elem) {
+			$href = $elem->getAttribute('href');
+			$href = getAbsoluteUrl($href, $remote_provider['url']);
+			$elem->setAttribute('href',  $href);
+		}
+
+		$statement .= $statement_dom->innerHTML;
+
+		return [
+			'type' => 'html',
+			'title' => $title,
+			'time_limit' => null,
+			'memory_limit' => null,
+			'difficulty' => -1,
+			'statement' => $statement,
+		];
+	}
+
 	public static function getProblemRemoteUrl($oj, $id) {
 		if ($oj === 'codeforces') {
 			return static::getCodeforcesProblemUrl($id);
 		} else if ($oj === 'atcoder') {
 			return static::getAtcoderProblemUrl($id);
+		} else if ($oj === 'uoj') {
+			return static::getUojProblemUrl($id);
 		}
 
 		return null;
@@ -289,6 +350,8 @@ class UOJRemoteProblem {
 			return static::getCodeforcesProblemBasicInfo($id);
 		} else if ($oj === 'atcoder') {
 			return static::getAtcoderProblemBasicInfo($id);
+		} else if ($oj === 'uoj') {
+			return static::getUojProblemBasicInfo($id);
 		}
 
 		return null;