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638 lines
18 KiB
638 lines
18 KiB
2 years ago
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<?php
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declare(strict_types=1);
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namespace PhpMyAdmin;
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use DirectoryIterator;
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use PhpMyAdmin\Utils\HttpRequest;
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use stdClass;
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use function array_key_exists;
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use function array_shift;
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use function basename;
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use function bin2hex;
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use function count;
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use function date;
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use function explode;
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use function fclose;
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use function file_exists;
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use function file_get_contents;
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use function fopen;
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use function fread;
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use function fseek;
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use function function_exists;
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use function gzuncompress;
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use function implode;
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use function in_array;
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use function intval;
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use function is_bool;
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use function is_dir;
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use function is_file;
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use function json_decode;
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use function ord;
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use function preg_match;
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use function str_contains;
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use function str_replace;
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use function strlen;
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use function strpos;
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use function strtolower;
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use function substr;
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use function trim;
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use function unpack;
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use const DIRECTORY_SEPARATOR;
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use const PHP_EOL;
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/**
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* Git class to manipulate Git data
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*/
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class Git
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{
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/**
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* Enable Git information search and process
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*
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* @var bool
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*/
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private $showGitRevision;
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/**
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* Git has been found and the data fetched
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*
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* @var bool
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*/
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private $hasGit = false;
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public function __construct(bool $showGitRevision)
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{
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$this->showGitRevision = $showGitRevision;
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}
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public function hasGitInformation(): bool
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{
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return $this->hasGit;
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}
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/**
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* detects if Git revision
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*
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* @param string $git_location (optional) verified git directory
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*/
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public function isGitRevision(&$git_location = null): bool
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{
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if (! $this->showGitRevision) {
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return false;
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}
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// caching
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if (isset($_SESSION['is_git_revision']) && array_key_exists('git_location', $_SESSION)) {
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// Define location using cached value
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$git_location = $_SESSION['git_location'];
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return (bool) $_SESSION['is_git_revision'];
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}
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// find out if there is a .git folder
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// or a .git file (--separate-git-dir)
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$git = '.git';
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if (is_dir($git)) {
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if (! @is_file($git . '/config')) {
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$_SESSION['git_location'] = null;
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$_SESSION['is_git_revision'] = false;
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return false;
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}
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$git_location = $git;
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} elseif (is_file($git)) {
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$contents = (string) file_get_contents($git);
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$gitmatch = [];
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// Matches expected format
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if (! preg_match('/^gitdir: (.*)$/', $contents, $gitmatch)) {
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$_SESSION['git_location'] = null;
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$_SESSION['is_git_revision'] = false;
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return false;
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}
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if (! @is_dir($gitmatch[1])) {
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$_SESSION['git_location'] = null;
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$_SESSION['is_git_revision'] = false;
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return false;
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}
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//Detected git external folder location
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$git_location = $gitmatch[1];
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} else {
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$_SESSION['git_location'] = null;
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$_SESSION['is_git_revision'] = false;
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return false;
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}
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// Define session for caching
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$_SESSION['git_location'] = $git_location;
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$_SESSION['is_git_revision'] = true;
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return true;
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}
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private function readPackFile(string $packFile, int $packOffset): ?string
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{
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// open pack file
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$packFileRes = fopen($packFile, 'rb');
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if ($packFileRes === false) {
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return null;
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}
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// seek to start
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fseek($packFileRes, $packOffset);
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// parse header
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$headerData = fread($packFileRes, 1);
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if ($headerData === false) {
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return null;
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}
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$header = ord($headerData);
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$type = ($header >> 4) & 7;
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$hasnext = ($header & 128) >> 7;
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$size = $header & 0xf;
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$offset = 4;
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while ($hasnext) {
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$readData = fread($packFileRes, 1);
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if ($readData === false) {
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return null;
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}
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$byte = ord($readData);
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$size |= ($byte & 0x7f) << $offset;
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$hasnext = ($byte & 128) >> 7;
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$offset += 7;
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}
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// we care only about commit objects
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if ($type != 1) {
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return null;
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}
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// read data
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$commit = fread($packFileRes, $size);
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fclose($packFileRes);
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if ($commit === false) {
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return null;
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}
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return $commit;
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}
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private function getPackOffset(string $packFile, string $hash): ?int
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{
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// load index
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$index_data = @file_get_contents($packFile);
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if ($index_data === false) {
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return null;
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}
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// check format
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if (substr($index_data, 0, 4) != "\377tOc") {
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return null;
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}
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// check version
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$version = unpack('N', substr($index_data, 4, 4));
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if ($version[1] != 2) {
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return null;
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}
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// parse fanout table
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$fanout = unpack(
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'N*',
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substr($index_data, 8, 256 * 4)
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);
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// find where we should search
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$firstbyte = intval(substr($hash, 0, 2), 16);
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// array is indexed from 1 and we need to get
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// previous entry for start
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if ($firstbyte == 0) {
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$start = 0;
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} else {
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$start = $fanout[$firstbyte];
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}
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$end = $fanout[$firstbyte + 1];
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// stupid linear search for our sha
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$found = false;
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$offset = 8 + (256 * 4);
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for ($position = $start; $position < $end; $position++) {
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$sha = strtolower(
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bin2hex(
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substr($index_data, $offset + ($position * 20), 20)
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)
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);
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if ($sha == $hash) {
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$found = true;
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break;
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}
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}
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if (! $found) {
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return null;
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}
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// read pack offset
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$offset = 8 + (256 * 4) + (24 * $fanout[256]);
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$packOffsets = unpack(
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'N',
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substr($index_data, $offset + ($position * 4), 4)
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);
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return $packOffsets[1];
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}
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/**
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* Un pack a commit with gzuncompress
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*
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* @param string $gitFolder The Git folder
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* @param string $hash The commit hash
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*
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* @return array|false|null
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*/
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private function unPackGz(string $gitFolder, string $hash)
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{
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$commit = false;
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$gitFileName = $gitFolder . '/objects/'
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. substr($hash, 0, 2) . '/' . substr($hash, 2);
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if (@file_exists($gitFileName)) {
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$commit = @file_get_contents($gitFileName);
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if ($commit === false) {
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$this->hasGit = false;
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return null;
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}
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$commitData = gzuncompress($commit);
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if ($commitData === false) {
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return null;
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}
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$commit = explode("\0", $commitData, 2);
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$commit = explode("\n", $commit[1]);
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$_SESSION['PMA_VERSION_COMMITDATA_' . $hash] = $commit;
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} else {
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$pack_names = [];
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// work with packed data
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$packs_file = $gitFolder . '/objects/info/packs';
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$packs = '';
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if (@file_exists($packs_file)) {
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$packs = @file_get_contents($packs_file);
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}
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if ($packs) {
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// File exists. Read it, parse the file to get the names of the
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// packs. (to look for them in .git/object/pack directory later)
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foreach (explode("\n", $packs) as $line) {
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// skip blank lines
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if (strlen(trim($line)) == 0) {
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continue;
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}
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// skip non pack lines
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if ($line[0] !== 'P') {
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continue;
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}
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// parse names
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$pack_names[] = substr($line, 2);
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}
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} else {
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// '.git/objects/info/packs' file can be missing
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// (at least in mysGit)
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// File missing. May be we can look in the .git/object/pack
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// directory for all the .pack files and use that list of
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// files instead
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$dirIterator = new DirectoryIterator($gitFolder . '/objects/pack');
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foreach ($dirIterator as $file_info) {
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$file_name = $file_info->getFilename();
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// if this is a .pack file
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if (! $file_info->isFile() || substr($file_name, -5) !== '.pack') {
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continue;
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}
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$pack_names[] = $file_name;
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}
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}
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$hash = strtolower($hash);
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foreach ($pack_names as $pack_name) {
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$index_name = str_replace('.pack', '.idx', $pack_name);
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$packOffset = $this->getPackOffset($gitFolder . '/objects/pack/' . $index_name, $hash);
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if ($packOffset === null) {
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continue;
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}
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$commit = $this->readPackFile($gitFolder . '/objects/pack/' . $pack_name, $packOffset);
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if ($commit !== null) {
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$commit = gzuncompress($commit);
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if ($commit !== false) {
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$commit = explode("\n", $commit);
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}
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}
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$_SESSION['PMA_VERSION_COMMITDATA_' . $hash] = $commit;
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}
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}
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return $commit;
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}
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/**
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* Extract committer, author and message from commit body
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*
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* @param array $commit The commit body
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*
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* @return array<int,array<string,string>|string>
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*/
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private function extractDataFormTextBody(array $commit): array
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{
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$author = [
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'name' => '',
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'email' => '',
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'date' => '',
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];
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$committer = [
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'name' => '',
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'email' => '',
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'date' => '',
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];
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do {
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$dataline = array_shift($commit);
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$datalinearr = explode(' ', $dataline, 2);
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$linetype = $datalinearr[0];
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if (! in_array($linetype, ['author', 'committer'])) {
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continue;
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}
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$user = $datalinearr[1];
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preg_match('/([^<]+)<([^>]+)> ([0-9]+)( [^ ]+)?/', $user, $user);
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$user2 = [
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'name' => trim($user[1]),
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'email' => trim($user[2]),
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'date' => date('Y-m-d H:i:s', (int) $user[3]),
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];
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if (isset($user[4])) {
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$user2['date'] .= $user[4];
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}
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${$linetype} = $user2;
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} while ($dataline != '');
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$message = trim(implode(' ', $commit));
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return [$author, $committer, $message];
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}
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/**
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* Is the commit remote
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*
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* @param mixed $commit The commit
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* @param bool $isRemoteCommit Is the commit remote ?, will be modified by reference
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* @param string $hash The commit hash
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||
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*
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||
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* @return stdClass|null The commit body from the GitHub API
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*/
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|
private function isRemoteCommit(&$commit, bool &$isRemoteCommit, string $hash): ?stdClass
|
||
|
|
{
|
||
|
|
$httpRequest = new HttpRequest();
|
||
|
|
|
||
|
|
// check if commit exists in Github
|
||
|
|
if ($commit !== false && isset($_SESSION['PMA_VERSION_REMOTECOMMIT_' . $hash])) {
|
||
|
|
$isRemoteCommit = $_SESSION['PMA_VERSION_REMOTECOMMIT_' . $hash];
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$link = 'https://www.phpmyadmin.net/api/commit/' . $hash . '/';
|
||
|
|
$is_found = $httpRequest->create($link, 'GET');
|
||
|
|
if ($is_found === false) {
|
||
|
|
$isRemoteCommit = false;
|
||
|
|
$_SESSION['PMA_VERSION_REMOTECOMMIT_' . $hash] = false;
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($is_found === null) {
|
||
|
|
// no remote link for now, but don't cache this as GitHub is down
|
||
|
|
$isRemoteCommit = false;
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$isRemoteCommit = true;
|
||
|
|
$_SESSION['PMA_VERSION_REMOTECOMMIT_' . $hash] = true;
|
||
|
|
if ($commit === false) {
|
||
|
|
// if no local commit data, try loading from Github
|
||
|
|
return json_decode((string) $is_found);
|
||
|
|
}
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
private function getHashFromHeadRef(string $gitFolder, string $refHead): array
|
||
|
|
{
|
||
|
|
$branch = false;
|
||
|
|
|
||
|
|
// are we on any branch?
|
||
|
|
if (! str_contains($refHead, '/')) {
|
||
|
|
return [trim($refHead), $branch];
|
||
|
|
}
|
||
|
|
|
||
|
|
// remove ref: prefix
|
||
|
|
$refHead = substr(trim($refHead), 5);
|
||
|
|
if (strpos($refHead, 'refs/heads/') === 0) {
|
||
|
|
$branch = substr($refHead, 11);
|
||
|
|
} else {
|
||
|
|
$branch = basename($refHead);
|
||
|
|
}
|
||
|
|
|
||
|
|
$refFile = $gitFolder . '/' . $refHead;
|
||
|
|
if (@file_exists($refFile)) {
|
||
|
|
$hash = @file_get_contents($refFile);
|
||
|
|
if ($hash === false) {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
return [null, null];
|
||
|
|
}
|
||
|
|
|
||
|
|
return [trim($hash), $branch];
|
||
|
|
}
|
||
|
|
|
||
|
|
// deal with packed refs
|
||
|
|
$packedRefs = @file_get_contents($gitFolder . '/packed-refs');
|
||
|
|
if ($packedRefs === false) {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
return [null, null];
|
||
|
|
}
|
||
|
|
|
||
|
|
// split file to lines
|
||
|
|
$refLines = explode(PHP_EOL, $packedRefs);
|
||
|
|
foreach ($refLines as $line) {
|
||
|
|
// skip comments
|
||
|
|
if ($line[0] === '#') {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// parse line
|
||
|
|
$parts = explode(' ', $line);
|
||
|
|
// care only about named refs
|
||
|
|
if (count($parts) != 2) {
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// have found our ref?
|
||
|
|
if ($parts[1] == $refHead) {
|
||
|
|
$hash = $parts[0];
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (! isset($hash)) {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
// Could not find ref
|
||
|
|
return [null, null];
|
||
|
|
}
|
||
|
|
|
||
|
|
return [$hash, $branch];
|
||
|
|
}
|
||
|
|
|
||
|
|
private function getCommonDirContents(string $gitFolder): ?string
|
||
|
|
{
|
||
|
|
if (! is_file($gitFolder . '/commondir')) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$commonDirContents = @file_get_contents($gitFolder . '/commondir');
|
||
|
|
if ($commonDirContents === false) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
return trim($commonDirContents);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* detects Git revision, if running inside repo
|
||
|
|
*/
|
||
|
|
public function checkGitRevision(): ?array
|
||
|
|
{
|
||
|
|
// find out if there is a .git folder
|
||
|
|
$gitFolder = '';
|
||
|
|
if (! $this->isGitRevision($gitFolder)) {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$ref_head = @file_get_contents($gitFolder . '/HEAD');
|
||
|
|
|
||
|
|
if (! $ref_head) {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$commonDirContents = $this->getCommonDirContents($gitFolder);
|
||
|
|
if ($commonDirContents !== null) {
|
||
|
|
$gitFolder .= DIRECTORY_SEPARATOR . $commonDirContents;
|
||
|
|
}
|
||
|
|
|
||
|
|
[$hash, $branch] = $this->getHashFromHeadRef($gitFolder, $ref_head);
|
||
|
|
if ($hash === null) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$commit = false;
|
||
|
|
if (! preg_match('/^[0-9a-f]{40}$/i', $hash)) {
|
||
|
|
$commit = false;
|
||
|
|
} elseif (isset($_SESSION['PMA_VERSION_COMMITDATA_' . $hash])) {
|
||
|
|
$commit = $_SESSION['PMA_VERSION_COMMITDATA_' . $hash];
|
||
|
|
} elseif (function_exists('gzuncompress')) {
|
||
|
|
$commit = $this->unPackGz($gitFolder, $hash);
|
||
|
|
if ($commit === null) {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
$is_remote_commit = false;
|
||
|
|
$commit_json = $this->isRemoteCommit(
|
||
|
|
$commit, // Will be modified if necessary by the function
|
||
|
|
$is_remote_commit, // Will be modified if necessary by the function
|
||
|
|
$hash
|
||
|
|
);
|
||
|
|
|
||
|
|
$is_remote_branch = false;
|
||
|
|
if ($is_remote_commit && $branch !== false) {
|
||
|
|
// check if branch exists in Github
|
||
|
|
if (isset($_SESSION['PMA_VERSION_REMOTEBRANCH_' . $hash])) {
|
||
|
|
$is_remote_branch = $_SESSION['PMA_VERSION_REMOTEBRANCH_' . $hash];
|
||
|
|
} else {
|
||
|
|
$httpRequest = new HttpRequest();
|
||
|
|
$link = 'https://www.phpmyadmin.net/api/tree/' . $branch . '/';
|
||
|
|
$is_found = $httpRequest->create($link, 'GET', true);
|
||
|
|
if (is_bool($is_found)) {
|
||
|
|
$is_remote_branch = $is_found;
|
||
|
|
$_SESSION['PMA_VERSION_REMOTEBRANCH_' . $hash] = $is_found;
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($is_found === null) {
|
||
|
|
// no remote link for now, but don't cache this as Github is down
|
||
|
|
$is_remote_branch = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ($commit !== false) {
|
||
|
|
[$author, $committer, $message] = $this->extractDataFormTextBody($commit);
|
||
|
|
} elseif (isset($commit_json->author, $commit_json->committer, $commit_json->message)) {
|
||
|
|
$author = [
|
||
|
|
'name' => $commit_json->author->name,
|
||
|
|
'email' => $commit_json->author->email,
|
||
|
|
'date' => $commit_json->author->date,
|
||
|
|
];
|
||
|
|
$committer = [
|
||
|
|
'name' => $commit_json->committer->name,
|
||
|
|
'email' => $commit_json->committer->email,
|
||
|
|
'date' => $commit_json->committer->date,
|
||
|
|
];
|
||
|
|
$message = trim($commit_json->message);
|
||
|
|
} else {
|
||
|
|
$this->hasGit = false;
|
||
|
|
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
$this->hasGit = true;
|
||
|
|
|
||
|
|
return [
|
||
|
|
'hash' => $hash,
|
||
|
|
'branch' => $branch,
|
||
|
|
'message' => $message,
|
||
|
|
'author' => $author,
|
||
|
|
'committer' => $committer,
|
||
|
|
'is_remote_commit' => $is_remote_commit,
|
||
|
|
'is_remote_branch' => $is_remote_branch,
|
||
|
|
];
|
||
|
|
}
|
||
|
|
}
|