vendor/golang.org/x/net/html/escape.go

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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package html

import (
	"bytes"
	"strings"
	"unicode/utf8"
)

// These replacements permit compatibility with old numeric entities that
// assumed Windows-1252 encoding.
// https://html.spec.whatwg.org/multipage/syntax.html#consume-a-character-reference
var replacementTable = [...]rune{
	'\u20AC', // First entry is what 0x80 should be replaced with.
	'\u0081',
	'\u201A',
	'\u0192',
	'\u201E',
	'\u2026',
	'\u2020',
	'\u2021',
	'\u02C6',
	'\u2030',
	'\u0160',
	'\u2039',
	'\u0152',
	'\u008D',
	'\u017D',
	'\u008F',
	'\u0090',
	'\u2018',
	'\u2019',
	'\u201C',
	'\u201D',
	'\u2022',
	'\u2013',
	'\u2014',
	'\u02DC',
	'\u2122',
	'\u0161',
	'\u203A',
	'\u0153',
	'\u009D',
	'\u017E',
	'\u0178', // Last entry is 0x9F.
	// 0x00->'\uFFFD' is handled programmatically.
	// 0x0D->'\u000D' is a no-op.
}

// unescapeEntity reads an entity like "&lt;" from b[src:] and writes the
// corresponding "<" to b[dst:], returning the incremented dst and src cursors.
// Precondition: b[src] == '&' && dst <= src.
// attribute should be true if parsing an attribute value.
func unescapeEntity(b []byte, dst, src int, attribute bool) (dst1, src1 int) {
	// https://html.spec.whatwg.org/multipage/syntax.html#consume-a-character-reference

	// i starts at 1 because we already know that s[0] == '&'.
	i, s := 1, b[src:]

	if len(s) <= 1 {
		b[dst] = b[src]
		return dst + 1, src + 1
	}

	if s[i] == '#' {
		if len(s) <= 3 { // We need to have at least "&#.".
			b[dst] = b[src]
			return dst + 1, src + 1
		}
		i++
		c := s[i]
		hex := false
		if c == 'x' || c == 'X' {
			hex = true
			i++
		}

		x := '\x00'
		for i < len(s) {
			c = s[i]
			i++
			if hex {
				if '0' <= c && c <= '9' {
					x = 16*x + rune(c) - '0'
					continue
				} else if 'a' <= c && c <= 'f' {
					x = 16*x + rune(c) - 'a' + 10
					continue
				} else if 'A' <= c && c <= 'F' {
					x = 16*x + rune(c) - 'A' + 10
					continue
				}
			} else if '0' <= c && c <= '9' {
				x = 10*x + rune(c) - '0'
				continue
			}
			if c != ';' {
				i--
			}
			break
		}

		if i <= 3 { // No characters matched.
			b[dst] = b[src]
			return dst + 1, src + 1
		}

		if 0x80 <= x && x <= 0x9F {
			// Replace characters from Windows-1252 with UTF-8 equivalents.
			x = replacementTable[x-0x80]
		} else if x == 0 || (0xD800 <= x && x <= 0xDFFF) || x > 0x10FFFF {
			// Replace invalid characters with the replacement character.
			x = '\uFFFD'
		}

		return dst + utf8.EncodeRune(b[dst:], x), src + i
	}

	// Consume the maximum number of characters possible, with the
	// consumed characters matching one of the named references.

	for i < len(s) {
		c := s[i]
		i++
		// Lower-cased characters are more common in entities, so we check for them first.
		if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || '0' <= c && c <= '9' {
			continue
		}
		if c != ';' {
			i--
		}
		break
	}

	entityName := string(s[1:i])
	if entityName == "" {
		// No-op.
	} else if attribute && entityName[len(entityName)-1] != ';' && len(s) > i && s[i] == '=' {
		// No-op.
	} else if x := entity[entityName]; x != 0 {
		return dst + utf8.EncodeRune(b[dst:], x), src + i
	} else if x := entity2[entityName]; x[0] != 0 {
		dst1 := dst + utf8.EncodeRune(b[dst:], x[0])
		return dst1 + utf8.EncodeRune(b[dst1:], x[1]), src + i
	} else if !attribute {
		maxLen := len(entityName) - 1
		if maxLen > longestEntityWithoutSemicolon {
			maxLen = longestEntityWithoutSemicolon
		}
		for j := maxLen; j > 1; j-- {
			if x := entity[entityName[:j]]; x != 0 {
				return dst + utf8.EncodeRune(b[dst:], x), src + j + 1
			}
		}
	}

	dst1, src1 = dst+i, src+i
	copy(b[dst:dst1], b[src:src1])
	return dst1, src1
}

// unescape unescapes b's entities in-place, so that "a&lt;b" becomes "a<b".
// attribute should be true if parsing an attribute value.
func unescape(b []byte, attribute bool) []byte {
	for i, c := range b {
		if c == '&' {
			dst, src := unescapeEntity(b, i, i, attribute)
			for src < len(b) {
				c := b[src]
				if c == '&' {
					dst, src = unescapeEntity(b, dst, src, attribute)
				} else {
					b[dst] = c
					dst, src = dst+1, src+1
				}
			}
			return b[0:dst]
		}
	}
	return b
}

// lower lower-cases the A-Z bytes in b in-place, so that "aBc" becomes "abc".
func lower(b []byte) []byte {
	for i, c := range b {
		if 'A' <= c && c <= 'Z' {
			b[i] = c + 'a' - 'A'
		}
	}
	return b
}

const escapedChars = "&'<>\"\r"

func escape(w writer, s string) error {
	i := strings.IndexAny(s, escapedChars)
	for i != -1 {
		if _, err := w.WriteString(s[:i]); err != nil {
			return err
		}
		var esc string
		switch s[i] {
		case '&':
			esc = "&amp;"
		case '\'':
			// "&#39;" is shorter than "&apos;" and apos was not in HTML until HTML5.
			esc = "&#39;"
		case '<':
			esc = "&lt;"
		case '>':
			esc = "&gt;"
		case '"':
			// "&#34;" is shorter than "&quot;".
			esc = "&#34;"
		case '\r':
			esc = "&#13;"
		default:
			panic("unrecognized escape character")
		}
		s = s[i+1:]
		if _, err := w.WriteString(esc); err != nil {
			return err
		}
		i = strings.IndexAny(s, escapedChars)
	}
	_, err := w.WriteString(s)
	return err
}

// EscapeString escapes special characters like "<" to become "&lt;". It
// escapes only five such characters: <, >, &, ' and ".
// UnescapeString(EscapeString(s)) == s always holds, but the converse isn't
// always true.
func EscapeString(s string) string {
	if strings.IndexAny(s, escapedChars) == -1 {
		return s
	}
	var buf bytes.Buffer
	escape(&buf, s)
	return buf.String()
}

// UnescapeString unescapes entities like "&lt;" to become "<". It unescapes a
// larger range of entities than EscapeString escapes. For example, "&aacute;"
// unescapes to "á", as does "&#225;" and "&xE1;".
// UnescapeString(EscapeString(s)) == s always holds, but the converse isn't
// always true.
func UnescapeString(s string) string {
	for _, c := range s {
		if c == '&' {
			return string(unescape([]byte(s), false))
		}
	}
	return s
}

26/stable29'>backport/50026/stable29
Nextcloud server, a safe home for all your data: https://github.com/nextcloud/server www-data

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<?php

declare(strict_types=1);
/*
 * @copyright 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
 *
 * @author 2022 Christoph Wurst <christoph@winzerhof-wurst.at>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace lib\AppFramework\Db;

use OCP\AppFramework\Db\TTransactional;
use OCP\IDBConnection;
use PHPUnit\Framework\MockObject\MockObject;
use RuntimeException;
use Test\TestCase;

class TransactionalTest extends TestCase {

	/** @var IDBConnection|MockObject */
	private IDBConnection $db;

	protected function setUp(): void {
		parent::setUp();

		$this->db = $this->createMock(IDBConnection::class);
	}

	public function testAtomicRollback(): void {
		$test = new class($this->db) {
			use TTransactional;

			private IDBConnection $db;

			public function __construct(IDBConnection $db) {
				$this->db = $db;
			}

			public function fail(): void {
				$this->atomic(function () {
					throw new RuntimeException('nope');
				}, $this->db);
			}
		};
		$this->db->expects(self::once())
			->method('beginTransaction');
		$this->db->expects(self::once())
			->method('rollback');
		$this->db->expects(self::never())
			->method('commit');
		$this->expectException(RuntimeException::class);

		$test->fail();
	}

	public function testAtomicCommit(): void {
		$test = new class($this->db) {
			use TTransactional;

			private IDBConnection $db;

			public function __construct(IDBConnection $db) {
				$this->db = $db;
			}

			public function succeed(): int {
				return $this->atomic(function () {
					return 3;
				}, $this->db);
			}
		};
		$this->db->expects(self::once())
			->method('beginTransaction');
		$this->db->expects(self::never())
			->method('rollback');
		$this->db->expects(self::once())
			->method('commit');

		$result = $test->succeed();

		self::assertEquals(3, $result);
	}
}