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WebDav Storage backend

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Philipp Holzer 2021-08-25 23:47:18 +02:00
parent 020a1245fd
commit 15d77952ac
Signed by: nupplaPhil
GPG key ID: 24A7501396EB5432
4 changed files with 517 additions and 0 deletions
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22
webdav_storage/composer.json Normal file
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{
"name": "friendica-addons/webdav_storage",
"description": "Adds the possibility to use WebDAV as a selectable storage backend",
"type": "friendica-addon",
"authors": [
{
"name": "Philipp Holzer",
"email": "admin@philipp.info",
"homepage": "https://blog.philipp.info",
"role": "Developer"
}
],
"require": {
"php": ">=7.0"
},
"license": "3-clause BSD license",
"config": {
"optimize-autoloader": true,
"autoloader-suffix": "WebDavStorageAddon",
"preferred-install": "dist"
}
}

369
webdav_storage/src/WebDav.php Normal file
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<?php
namespace Friendica\Addon\webdav_storage\src;
use Exception;
use Friendica\Core\Config\IConfig;
use Friendica\Core\L10n;
use Friendica\Model\Storage\IWritableStorage;
use Friendica\Model\Storage\ReferenceStorageException;
use Friendica\Model\Storage\StorageException;
use Friendica\Network\HTTPClientOptions;
use Friendica\Network\IHTTPClient;
use Friendica\Util\Strings;
use Psr\Log\LoggerInterface;
/**
* A WebDav Backend Storage class
*/
class WebDav implements IWritableStorage
{
const NAME = 'WebDav';
/** @var L10n */
private $l10n;
/** @var IConfig */
private $config;
/** @var string */
private $url;
/** @var IHTTPClient */
private $client;
/** @var LoggerInterface */
private $logger;
/** @var array */
private $authOptions;
public function __construct(L10n $l10n, IConfig $config, IHTTPClient $client, LoggerInterface $logger)
{
$this->l10n = $l10n;
$this->config = $config;
$this->client = $client;
$this->logger = $logger;
$this->authOptions = null;
if (!empty($this->config->get('webdav', 'username'))) {
$this->authOptions = [
$this->config->get('webdav', 'username'),
(string)$this->config->get('webdav', 'password', ''),
$this->config->get('webdav', 'auth_type', 'basic')
];
}
$this->url = $this->config->get('webdav', 'url');
}
/**
* Split data ref and return file path
*
* @param string $reference Data reference
*
* @return string[]
*/
private function pathForRef(string $reference): array
{
$fold1 = substr($reference, 0, 2);
$fold2 = substr($reference, 2, 2);
$file = substr($reference, 4);
return [$this->encodePath(implode('/', [$fold1, $fold2, $file])), implode('/', [$fold1, $fold2]), $file];
}
/**
* URL encodes the given path but keeps the slashes
*
* @param string $path to encode
*
* @return string encoded path
*/
protected function encodePath(string $path): string
{
// slashes need to stay
return str_replace('%2F', '/', rawurlencode($path));
}
/**
* Checks if the URL exists
*
* @param string $uri the URL to check
*
* @return bool true in case the file/folder exists
*/
protected function exists(string $uri): bool
{
return $this->client->head($uri, [HTTPClientOptions::AUTH => $this->authOptions])->getReturnCode() == 200;
}
/**
* Checks if a folder has items left
*
* @param string $uri the URL to check
*
* @return bool true in case there are items left in the folder
*/
protected function hasItems(string $uri): bool
{
$dom = new \DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;
$root = $dom->createElementNS('DAV:', 'd:propfind');
$prop = $dom->createElement('d:allprop');
$dom->appendChild($root)->appendChild($prop);
$opts = [
HTTPClientOptions::AUTH => $this->authOptions,
HTTPClientOptions::HEADERS => ['Depth' => 1, 'Prefer' => 'return-minimal', 'Content-Type' => 'application/xml'],
HTTPClientOptions::BODY => $dom->saveXML(),
];
$response = $this->client->request('propfind', $uri, $opts);
$responseDoc = new \DOMDocument();
$responseDoc->loadXML($response->getBody());
$responseDoc->formatOutput = true;
$xpath = new \DOMXPath($responseDoc);
$xpath->registerNamespace('d', 'DAV');
$result = $xpath->query('//d:multistatus/d:response');
// returns at least its own directory, so >1
return $result !== false && count($result) > 1;
}
/**
* Creates a DAV-collection (= folder) for the given uri
*
* @param string $uri The uri for creating a DAV-collection
*
* @return bool true in case the creation was successful (not immutable!)
*/
protected function mkcol(string $uri): bool
{
return $this->client->request('mkcol', $uri, [HTTPClientOptions::AUTH => $this->authOptions])
->getReturnCode() == 200;
}
/**
* Checks if the given path exists and if not creates it
*
* @param string $fullPath the full path (the folder structure after the hostname)
*/
protected function checkAndCreatePath(string $fullPath): void
{
$finalUrl = $this->url . '/' . trim($fullPath, '/');
if ($this->exists($finalUrl)) {
return;
}
$pathParts = explode('/', trim($fullPath, '/'));
$path = '';
foreach ($pathParts as $part) {
$path .= '/' . $part;
$partUrl = $this->url . $path;
if (!$this->exists($partUrl)) {
$this->mkcol($partUrl);
}
}
}
/**
* Checks recursively, if paths are empty and deletes them
*
* @param string $fullPath the full path (the folder structure after the hostname)
*
* @throws StorageException In case a directory cannot get deleted
*/
protected function checkAndDeletePath(string $fullPath): void
{
$pathParts = explode('/', trim($fullPath, '/'));
$partURL = '/' . implode('/', $pathParts);
foreach ($pathParts as $pathPart) {
$checkUrl = $this->url . $partURL;
if (!empty($partURL) && !$this->hasItems($checkUrl)) {
$response = $this->client->request('delete', $checkUrl, [HTTPClientOptions::AUTH => $this->authOptions]);
if (!$response->isSuccess()) {
if ($response->getReturnCode() == "404") {
$this->logger->warning('Directory already deleted.', ['uri' => $checkUrl]);
} else {
throw new StorageException(sprintf('Unpredicted error for %s: %s', $checkUrl, $response->getError()), $response->getReturnCode());
}
}
}
$partURL = substr($partURL, 0, -strlen('/' . $pathPart));
}
}
/**
* {@inheritDoc}
*/
public function get(string $reference): string
{
$file = $this->pathForRef($reference);
$response = $this->client->request('get', $this->url . '/' . $file[0], [HTTPClientOptions::AUTH => $this->authOptions]);
if (!$response->isSuccess()) {
throw new ReferenceStorageException(sprintf('Invalid reference %s', $reference));
}
return $response->getBody();
}
/**
* {@inheritDoc}
*/
public function put(string $data, string $reference = ""): string
{
if ($reference === '') {
try {
$reference = Strings::getRandomHex();
} catch (Exception $exception) {
throw new StorageException('Webdav storage failed to generate a random hex', $exception->getCode(), $exception);
}
}
$file = $this->pathForRef($reference);
$this->checkAndCreatePath($file[1]);
$opts = [
HTTPClientOptions::BODY => $data,
HTTPClientOptions::AUTH => $this->authOptions,
];
$this->client->request('put', $this->url . '/' . $file[0], $opts);
return $reference;
}
/**
* {@inheritDoc}
*/
public function delete(string $reference)
{
$file = $this->pathForRef($reference);
$response = $this->client->request('delete', $this->url . '/' . $file[0], [HTTPClientOptions::AUTH => $this->authOptions]);
if (!$response->isSuccess()) {
throw new ReferenceStorageException(sprintf('Invalid reference %s', $reference));
}
$this->checkAndDeletePath($file[1]);
}
/**
* @inheritDoc
*/
public function getOptions(): array
{
$auths = [
'' => 'None',
'basic' => 'Basic',
'digest' => 'Digest',
];
return [
'url' => [
'input',
$this->l10n->t('URL'),
$this->url,
$this->l10n->t('URL to the Webdav endpoint, where files can be saved'),
true
],
'username' => [
'input',
$this->l10n->t('Username'),
$this->config->get('webdav', 'username', ''),
$this->l10n->t('Username to authenticate to the Webdav endpoint')
],
'password' => [
'password',
$this->l10n->t('Password'),
$this->config->get('webdav', 'username', ''),
$this->l10n->t('Password to authenticate to the Webdav endpoint')
],
'auth_type' => [
'select',
$this->l10n->t('Authentication type'),
$this->config->get('webdav', 'auth_type', ''),
$this->l10n->t('authentication type to the Webdav endpoint'),
$auths,
]
];
}
/**
* @inheritDoc
*/
public function saveOptions(array $data): array
{
$url = $data['url'] ?? '';
$username = $data['username'] ?? '';
$password = $data['password'] ?? '';
$auths = [
'' => 'None',
'basic' => 'Basic',
'digest' => 'Digest',
];
$authType = $data['auth_type'] ?? '';
if (!key_exists($authType, $auths)) {
return [
'auth_type' => $this->l10n->t('Authentication type is invalid.'),
];
}
$options = null;
if (!empty($username)) {
$options = [
$username,
$password,
$authType
];
}
if (!$this->client->head($url, [HTTPClientOptions::AUTH => $options])->isSuccess()) {
return [
'url' => $this->l10n->t('url is either invalid or not reachable'),
];
}
$this->config->set('webdav', 'url', $url);
$this->config->set('webdav', 'username', $username);
$this->config->set('webdav', 'password', $password);
$this->config->set('webdav', 'auth_type', $authType);
$this->url = $url;
return [];
}
/**
* {@inheritDoc}
*/
public function __toString()
{
return self::getName();
}
/**
* {@inheritDoc}
*/
public static function getName(): string
{
return self::NAME;
}
}

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webdav_storage/tests/WebDavTest.php Normal file
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<?php
namespace Friendica\Addon\webdav_storage\tests;
use Friendica\Test\MockedTest;
class WebDavTest extends MockedTest
{
public function dataMultiStatus()
{
return [
'nextcloud' => [
'xml' => <<<EOF
<?xml version="1.0"?>
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns"
xmlns:nc="http://nextcloud.org/ns">
<d:response>
<d:href>/remote.php/dav/files/admin/Friendica_test/97/18/</d:href>
<d:propstat>
<d:prop>
<d:getlastmodified>Mon, 30 Aug 2021 12:58:54 GMT</d:getlastmodified>
<d:resourcetype>
<d:collection/>
</d:resourcetype>
<d:quota-used-bytes>45017</d:quota-used-bytes>
<d:quota-available-bytes>59180834349</d:quota-available-bytes>
<d:getetag>&quot;612cd60ec9fd5&quot;</d:getetag>
</d:prop>
<d:status>HTTP/1.1 200 OK</d:status>
</d:propstat>
</d:response>
<d:response>
<d:href>
/remote.php/dav/files/admin/Friendica_test/97/18/4d9d36f614dc005756bdfb9abbf1d8d24aa9ae842e5d6b5e7eb1dafbe767
</d:href>
<d:propstat>
<d:prop>
<d:getlastmodified>Mon, 30 Aug 2021 12:58:54 GMT</d:getlastmodified>
<d:getcontentlength>45017</d:getcontentlength>
<d:resourcetype/>
<d:getetag>&quot;4f7a144092532141d0e6b925e50a896e&quot;</d:getetag>
<d:getcontenttype>application/octet-stream
</d:getcontenttype>
</d:prop>
<d:status>HTTP/1.1 200 OK</d:status>
</d:propstat>
<d:propstat>
<d:prop>
<d:quota-used-bytes/>
<d:quota-available-bytes/>
</d:prop>
<d:status>HTTP/1.1 404 Not Found
</d:status>
</d:propstat>
</d:response>
</d:multistatus>
EOF,
'assertionCount' => 2,
],
'onlyDir' => [
'xml' => <<<EOF
<d:multistatus xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns" xmlns:oc="http://owncloud.org/ns" xmlns:nc="http://nextcloud.org/ns">
<d:response>
<d:href>/remote.php/dav/files/admin/Friendica_test/34/cf/</d:href>
<d:propstat>
<d:prop>
<d:getlastmodified>Sun, 05 Sep 2021 17:56:05 GMT</d:getlastmodified>
<d:resourcetype>
<d:collection/>
</d:resourcetype>
<d:quota-used-bytes>0</d:quota-used-bytes>
<d:quota-available-bytes>59182800697</d:quota-available-bytes>
<d:getetag>"613504b55db4f"</d:getetag>
</d:prop>
<d:status>HTTP/1.1 200 OK</d:status>
</d:propstat>
</d:response>
</d:multistatus>
EOF,
'assertionCount' => 1,
],
];
}
/**
* @dataProvider dataMultiStatus
*/
public function testMultistatus(string $xml, int $assertionCount)
{
$responseDoc = new \DOMDocument();
$responseDoc->loadXML($xml);
$xpath = new \DOMXPath($responseDoc);
$xpath->registerNamespace('d', 'DAV');
self::assertCount($assertionCount, $xpath->query('//d:multistatus/d:response'));
}
}

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webdav_storage/webdav_storage.php Normal file
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<?php
/*
* Name: WebDAV Storage
* Description: Adds the possibility to use WebDAV as a selectable storage backend
* Version: 1.0
* Author: Philipp Holzer
*/
use Friendica\Addon\webdav_storage\src\WebDav;
use Friendica\App;
use Friendica\Core\Hook;
use Friendica\DI;
function webdav_storage_install($a)
{
Hook::register('storage_instance' , __FILE__, 'webdav_storage_instance');
DI::storageManager()->register(WebDav::class);
}
function webdav_storage_uninstall()
{
DI::storageManager()->unregister(WebDav::getName());
}
function webdav_storage_instance(App $a, array &$data)
{
$data['storage'] = new WebDav(DI::l10n(), DI::config(), DI::httpClient(), DI::logger());
}