<?php

set_include_path(get_include_path() . PATH_SEPARATOR . '../lib');
include_once("config.inc.php");

require_once('Archive/Tar.php');

include_once("aur.inc.php");         # access AUR common functions
include_once("pkgfuncs.inc.php");    # package functions

set_lang();                 # this sets up the visitor's language
check_sid();                # see if they're still logged in

$cwd = getcwd();

if ($_COOKIE["AURSID"]) {
	$uid = uid_from_sid($_COOKIE['AURSID']);
}
else {
	$uid = NULL;
}

if ($uid):

	# Track upload errors
	$error = "";

	if (isset($_REQUEST['pkgsubmit'])) {

		# Make sure authenticated user submitted the package themselves
		if (!check_token()) {
			$error = __("Invalid token for user action.");
		}

		# Before processing, make sure we even have a file
		if (!$error) {
			if ($_FILES['pfile']['size'] == 0){
				$error = __("Error - No file uploaded");
			}
		}

		# Check whether the file is gzip'ed
		if (!$error) {
			$fh = fopen($_FILES['pfile']['tmp_name'], 'rb');
			fseek($fh, 0, SEEK_SET);
			list(, $magic) = unpack('v', fread($fh, 2));

			if ($magic != 0x8b1f) {
				$error = __("Error - unsupported file format (please submit gzip'ed tarballs generated by makepkg(8) only).");
			}
		}

		# Check uncompressed file size (ZIP bomb protection)
		if (!$error && $MAX_FILESIZE_UNCOMPRESSED) {
			fseek($fh, -4, SEEK_END);
			list(, $filesize_uncompressed) = unpack('V', fread($fh, 4));

			if ($filesize_uncompressed > $MAX_FILESIZE_UNCOMPRESSED) {
				$error = __("Error - uncompressed file size too large.");
			}
		}

		# Close file handle before extracting stuff
		if (isset($fh) && is_resource($fh)) {
			fclose($fh);
		}

		if (!$error) {
			$tar = new Archive_Tar($_FILES['pfile']['tmp_name']);

			# Extract PKGBUILD into a string
			$pkgbuild_raw = '';
			$dircount = 0;
			foreach ($tar->listContent() as $tar_file) {
				if (preg_match('/^[^\/]+\/PKGBUILD$/', $tar_file['filename'])) {
					$pkgbuild_raw = $tar->extractInString($tar_file['filename']);
				}
				elseif (preg_match('/^[^\/]+\/$/', $tar_file['filename'])) {
					if (++$dircount > 1) {
						$error = __("Error - source tarball may not contain more than one directory.");
						break;
					}
				}
				elseif (preg_match('/^[^\/]+$/', $tar_file['filename'])) {
					$error = __("Error - source tarball may not contain files outside a directory.");
					break;
				}
				elseif (preg_match('/^[^\/]+\/[^\/]+\//', $tar_file['filename'])) {
					$error = __("Error - source tarball may not contain nested subdirectories.");
					break;
				}
			}

			if (!$error && empty($pkgbuild_raw)) {
				$error = __("Error trying to unpack upload - PKGBUILD does not exist.");
			}
		}

		# if no error, get list of directory contents and process PKGBUILD
		# TODO: This needs to be completely rewritten to support stuff like arrays
		# and variable substitution among other things.
		if (!$error) {
			# process PKGBUILD - remove line concatenation
			#
			$pkgbuild = array();
			$line_no = 0;
			$lines = array();
			$continuation_line = 0;
			$current_line = "";
			$paren_depth = 0;
			foreach (explode("\n", $pkgbuild_raw) as $line) {
				$line = trim($line);
				# Remove comments
				$line = preg_replace('/\s*#.*/', '', $line);

				$char_counts = count_chars($line, 0);
				$paren_depth += $char_counts[ord('(')] - $char_counts[ord(')')];
				if (substr($line, strlen($line)-1) == "\\") {
					# continue appending onto existing line_no
					#
					$current_line .= substr($line, 0, strlen($line)-1);
					$continuation_line = 1;
				} elseif ($paren_depth > 0) {
					# assumed continuation
					# continue appending onto existing line_no
					#
					$current_line .= $line . " ";
					$continuation_line = 1;
				} else {
					# maybe the last line in a continuation, or a standalone line?
					#
					if ($continuation_line) {
						# append onto existing line_no
						#
						$current_line .= $line;
						$lines[$line_no] = $current_line;
						$current_line = "";
					} else {
						# it's own line_no
						#
						$lines[$line_no] = $line;
					}
					$continuation_line = 0;
					$line_no++;
				}
			}

			# Now process the lines and put any var=val lines into the
			# 'pkgbuild' array.
			while (list($k, $line) = each($lines)) {
				# Neutralize parameter substitution
				$line = preg_replace('/\${(\w+)#(\w*)}?/', '$1$2', $line);

				$lparts = Array();
				# Match variable assignment only.
				if (preg_match('/^\s*[_\w]+=[^=].*/', $line, $matches)) {
					$lparts = explode("=", $matches[0], 2);
				}

				if (!empty($lparts)) {
					# this is a variable/value pair, strip out
					# array parens and any quoting, except in pkgdesc
					# for pkgdesc, only remove start/end pairs of " or '
					if ($lparts[0]=="pkgdesc") {
						if ($lparts[1]{0} == '"' &&
								$lparts[1]{strlen($lparts[1])-1} == '"') {
							$pkgbuild[$lparts[0]] = substr($lparts[1], 1, -1);
						}
						elseif
							($lparts[1]{0} == "'" &&
							 $lparts[1]{strlen($lparts[1])-1} == "'") {
							$pkgbuild[$lparts[0]] = substr($lparts[1], 1, -1);
						} else {
							$pkgbuild[$lparts[0]] = $lparts[1];
						}
					} else {
						$pkgbuild[$lparts[0]] = str_replace(array("(",")","\"","'"), "",
								$lparts[1]);
					}
				}
			}

			# some error checking on PKGBUILD contents - just make sure each
			# variable has a value. This does not do any validity checking
			# on the values, or attempts to fix line continuation/wrapping.
			$req_vars = array("url", "pkgdesc", "license", "pkgrel", "pkgver", "arch", "pkgname");
			foreach ($req_vars as $var) {
				if (!array_key_exists($var, $pkgbuild)) {
					$error = __('Missing %s variable in PKGBUILD.', $var);
					break;
				}
			}
		}

		# TODO This is where other additional error checking can be
		# performed. Examples: #md5sums == #sources?, md5sums of any
		# included files match?, install scriptlet file exists?
		#

		# Check for http:// or other protocol in url
		#
		if (!$error) {
			$parsed_url = parse_url($pkgbuild['url']);
			if (!$parsed_url['scheme']) {
				$error = __("Package URL is missing a protocol (ie. http:// ,ftp://)");
			}
		}

		# Now, run through the pkgbuild array, and do "eval" and simple substituions.
		if (!$error) {
			while (list($k, $v) = each($pkgbuild)) {
				if (strpos($k,'eval ') !== false) {
					$k = preg_replace('/^eval[\s]*/', "", $k);
					##"eval" replacements
					$pattern_eval = '/{\$({?)([\w]+)(}?)}/';
					while (preg_match($pattern_eval,$v,$regs)) {
						$pieces = explode(",",$pkgbuild["$regs[2]"]);
						## nongreedy matching! - preserving the order of "eval"
						$pattern = '/([\S]*?){\$'.$regs[1].$regs[2].$regs[3].'}([\S]*)/';
						while (preg_match($pattern,$v,$regs_replace)) {
							$replacement = "";
							for ($i = 0; $i < sizeof($pieces); $i++) {
								$replacement .= $regs_replace[1].$pieces[$i].$regs_replace[2]." ";
							}
							$v=preg_replace($pattern, $replacement, $v, 1);
						}
					}
				}

				# Simple variable replacement
				$pattern_var = '/\$({?)([_\w]+)(}?)/';
				$offset = 0;
				while (preg_match($pattern_var, $v, $regs, PREG_OFFSET_CAPTURE, $offset)) {
					$var = $regs[2][0];
					$pos = $regs[0][1];
					$len = strlen($regs[0][0]);

					if (isset($new_pkgbuild[$var])) {
						$replacement = substr($new_pkgbuild[$var], strpos($new_pkgbuild[$var], " "));
					}
					else {
						$replacement = '';
					}

					$v = substr_replace($v, $replacement, $pos, $len);
					$offset = $pos + strlen($replacement);
				}
				$new_pkgbuild[$k] = $v;
			}
		}

		# Now we've parsed the pkgbuild, let's move it to where it belongs
		if (!$error) {
			$pkg_name = str_replace("'", "", $new_pkgbuild['pkgname']);
			$pkg_name = escapeshellarg($pkg_name);
			$pkg_name = str_replace("'", "", $pkg_name);

			$presult = preg_match("/^[a-z0-9][a-z0-9\.+_-]*$/", $pkg_name);

			if (!$presult) {
				$error = __("Invalid name: only lowercase letters are allowed.");
			}
		}

		if (isset($pkg_name)) {
			$incoming_pkgdir = INCOMING_DIR . substr($pkg_name, 0, 2) . "/" . $pkg_name;
		}

		if (!$error) {
			# First, see if this package already exists, and if it can be overwritten
			$pkg_id = pkgid_from_name($pkg_name);
			if (can_submit_pkg($pkg_name, $_COOKIE["AURSID"])) {
				if (file_exists($incoming_pkgdir)) {
					# Blow away the existing file/dir and contents
					rm_tree($incoming_pkgdir);
				}

				# The mode is masked by the current umask, so not as scary as it looks
				if (!mkdir($incoming_pkgdir, 0777, true)) {
					$error = __( "Could not create directory %s.", $incoming_pkgdir);
				}
			} else {
				$error = __( "You are not allowed to overwrite the %h%s%h package.", "<b>", $pkg_name, "</b>");
			}

		if (!$error) {
			# Check if package name is blacklisted.
			if (!$pkg_id && pkgname_is_blacklisted($pkg_name)) {
				if (!canSubmitBlacklisted(account_from_sid($_COOKIE["AURSID"]))) {
					$error = __( "%s is on the package blacklist, please check if it's available in the official repos.", $pkg_name);
				}
			}
		}
		}

		if (!$error) {
			if (!chdir($incoming_pkgdir)) {
				$error = __("Could not change directory to %s.", $incoming_pkgdir);
			}

			file_put_contents('PKGBUILD', $pkgbuild_raw);
			move_uploaded_file($_FILES['pfile']['tmp_name'], $pkg_name . '.tar.gz');
		}

		# Update the backend database
		if (!$error) {

			$dbh = db_connect();
			db_query("BEGIN", $dbh);

			$q = "SELECT * FROM Packages WHERE Name = '" . db_escape_string($new_pkgbuild['pkgname']) . "'";
			$result = db_query($q, $dbh);
			$pdata = mysql_fetch_assoc($result);

			if (isset($new_pkgbuild['epoch']) && (int)$new_pkgbuild['epoch'] > 0) {
				$pkg_version = sprintf('%d:%s-%s', $new_pkgbuild['epoch'], $new_pkgbuild['pkgver'], $new_pkgbuild['pkgrel']);
			} else {
				$pkg_version = sprintf('%s-%s', $new_pkgbuild['pkgver'], $new_pkgbuild['pkgrel']);
			}

			# Check the category to use, "1" meaning "none" (or "keep category" for
			# existing packages).
			if (isset($_POST['category'])) {
				$category_id = intval($_POST['category']);
				if ($category_id <= 0) {
					$category_id = 1;
				}
			}
			else {
				$category_id = 1;
			}

			if ($pdata) {
				# This is an overwrite of an existing package, the database ID
				# needs to be preserved so that any votes are retained. However,
				# PackageDepends and PackageSources can be purged.
				$packageID = $pdata["ID"];

				# Flush out old data that will be replaced with new data
				$q = "DELETE FROM PackageDepends WHERE PackageID = " . $packageID;
				db_query($q, $dbh);
				$q = "DELETE FROM PackageSources WHERE PackageID = " . $packageID;
				db_query($q, $dbh);

				# If a new category was chosen, change it to that
				if ($category_id > 1) {
					$q = sprintf( "UPDATE Packages SET CategoryID = %d WHERE ID = %d",
						$category_id,
						$packageID);

					db_query($q, $dbh);
				}

				# Update package data
				$q = sprintf("UPDATE Packages SET ModifiedTS = UNIX_TIMESTAMP(), Name = '%s', Version = '%s', License = '%s', Description = '%s', URL = '%s', OutOfDateTS = NULL, MaintainerUID = %d WHERE ID = %d",
					db_escape_string($new_pkgbuild['pkgname']),
					db_escape_string($pkg_version),
					db_escape_string($new_pkgbuild['license']),
					db_escape_string($new_pkgbuild['pkgdesc']),
					db_escape_string($new_pkgbuild['url']),
					$uid,
					$packageID);

				db_query($q, $dbh);

			} else {
				# This is a brand new package
				$q = sprintf("INSERT INTO Packages (Name, License, Version, CategoryID, Description, URL, SubmittedTS, ModifiedTS, SubmitterUID, MaintainerUID) VALUES ('%s', '%s', '%s', %d, '%s', '%s', UNIX_TIMESTAMP(), UNIX_TIMESTAMP(), %d, %d)",
					db_escape_string($new_pkgbuild['pkgname']),
					db_escape_string($new_pkgbuild['license']),
					db_escape_string($pkg_version),
					$category_id,
					db_escape_string($new_pkgbuild['pkgdesc']),
					db_escape_string($new_pkgbuild['url']),
					$uid,
					$uid);

				db_query($q, $dbh);
				$packageID = mysql_insert_id($dbh);

			}

			# Update package depends
			$depends = explode(" ", $new_pkgbuild['depends']);
			if ($depends !== false) {
				foreach ($depends as $dep) {
					$deppkgname = preg_replace("/(<|<=|=|>=|>).*/", "", $dep);
					$depcondition = str_replace($deppkgname, "", $dep);

					if ($deppkgname == "") {
						continue;
					}
					else if ($deppkgname == "#") {
						break;
					}

					$q = sprintf("INSERT INTO PackageDepends (PackageID, DepName, DepCondition) VALUES (%d, '%s', '%s')",
						$packageID,
						db_escape_string($deppkgname),
						db_escape_string($depcondition));

					db_query($q, $dbh);
				}
			}

			# Insert sources
			$sources = explode(" ", $new_pkgbuild['source']);
			foreach ($sources as $src) {
				if ($src != "" ) {
					$q = "INSERT INTO PackageSources (PackageID, Source) VALUES (";
					$q .= $packageID . ", '" . db_escape_string($src) . "')";
					db_query($q, $dbh);
				}
			}

			# If we just created this package, or it was an orphan and we
			# auto-adopted, add submitting user to the notification list.
			if (!$pdata || $pdata["MaintainerUID"] === NULL) {
				pkg_notify(account_from_sid($_COOKIE["AURSID"], $dbh), array($packageID), true, $dbh);
			}

			# Entire package creation process is atomic
			db_query("COMMIT", $dbh);

			header('Location: packages.php?ID=' . $packageID);
		}

		chdir($cwd);
	}

# Logic over, let's do some output

html_header("Submit");

?>

<?php if ($error): ?>
	<p class="pkgoutput"><?php print $error ?></p>
<?php endif; ?>

<div class="pgbox">
	<div class="pgboxtitle">
		<span class="f3"><?php print __("Submit"); ?></span>
	</div>
	<div class="pgboxbody">
	<p><?php echo __("Upload your source packages here. Create source packages with `makepkg --source`.") ?></p>

<?php
	if (empty($_REQUEST['pkgsubmit']) || $error):
		# User is not uploading, or there were errors uploading - then
		# give the visitor the default upload form
		if (ini_get("file_uploads")):

			$pkg_categories = pkgCategories();
?>

<form action='pkgsubmit.php' method='post' enctype='multipart/form-data'>
	<div> <input type='hidden' name='pkgsubmit' value='1' />
	<input type='hidden' name='token' value='<?php print htmlspecialchars($_COOKIE['AURSID']) ?>' /> </div>
	<table border='0' cellspacing='5'>
		<tr>
			<td class='f4' align='right'><?php print __("Package Category"); ?>:</td>
			<td class='f4' align='left'>
			<select name='category'>
				<option value='1'><?php print __("Select Category"); ?></option>
				<?php
					foreach ($pkg_categories as $num => $cat):
						print "<option value='" . $num . "'";
						if (isset($_POST['category']) && $_POST['category'] == $cat):
							print " selected='selected'";
						endif;
						print ">" . $cat . "</option>";
					endforeach;
				?>
			</select>
			</td>
		</tr>
		<tr>
			<td class='f4' align='right'><?php print __("Upload package file"); ?>:</td>
			<td class='f4' align='left'>
				<input type='file' name='pfile' size='30' />
			</td>
		</tr>
		<tr>
			<td align='left'>
				<input class='button' type='submit' value='<?php print __("Upload"); ?>' />
			</td>
		</tr>
	</table>
</form>

<?php
		else:
			print __("Sorry, uploads are not permitted by this server.");
?>

<br />

<?php
		endif;
	endif;
else:
	# Visitor is not logged in
	print __("You must create an account before you can upload packages.");
	exit();
?>

<br />

<?php
endif;
?>

	</div>
</div>

<?php
html_footer(AUR_VERSION);