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Move to more generic way of parsing wopi discovery
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Signed-off-by: Julius Härtl <[email protected]>
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@juliusknorr
juliusknorr committed Dec 9, 2022
1 parent b51562d commit 8d2a491
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Showing 2 changed files with 243 additions and 16 deletions.
4 changes: 2 additions & 2 deletions lib/TokenManager.php
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Original file line number Diff line number Diff line change
Expand Up @@ -224,7 +224,7 @@ public function getToken($fileId, $shareToken = null, $editoruid = null, $direct
$wopi = $this->wopiMapper->generateFileToken($fileId, $owneruid, $editoruid, $version, $updatable, $serverHost, $guestName, 0, $hideDownload, $direct, 0, $shareToken);

return [
$this->wopiParser->getUrlSrc($file->getMimeType())['urlsrc'], // url src might not be found ehre
$this->wopiParser->getUrlSrcForFile($file, $updatable),
$wopi->getToken(),
$wopi
];
Expand Down Expand Up @@ -308,7 +308,7 @@ public function getTokenForTemplate(File $templateFile, $userId, $targetFileId,
}

return [
$this->wopiParser->getUrlSrc($templateFile->getMimeType())['urlsrc'],
$this->wopiParser->getUrlSrcForFile($targetFile),
$wopi
];
}
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255 changes: 241 additions & 14 deletions lib/WOPI/Parser.php
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Original file line number Diff line number Diff line change
Expand Up @@ -21,41 +21,268 @@

namespace OCA\Richdocuments\WOPI;

use OCP\Files\File;
use OCP\IL10N;
use OCP\IRequest;
use SimpleXMLElement;

class Parser {
/** @var DiscoveryManager */
private $discoveryManager;
public const ACTION_EDIT = 'edit';
public const ACTION_VIEW = 'view';
public const ACTION_EDITNEW = 'editnew';

// https://wopi.readthedocs.io/en/latest/faq/languages.html
public const SUPPORTED_LANGUAGES = [
'af-ZA',
'am-ET',
'ar-SA',
'as-IN',
'az-Latn-AZ',
'be-BY',
'bg-BG',
'bn-BD',
'bn-IN',
'bs-Latn-BA',
'ca-ES',
'ca-ES-valencia',
'chr-Cher-US',
'cs-CZ',
'cy-GB',
'da-DK',
'de-DE',
'el-GR',
'en-gb',
'en-US',
'es-ES',
'es-mx',
'et-EE',
'eu-ES',
'fa-IR',
'fi-FI',
'fil-PH',
'fr-ca',
'fr-FR',
'ga-IE',
'gd-GB',
'gl-ES',
'gu-IN',
'ha-Latn-NG',
'he-IL',
'hi-IN',
'hr-HR',
'hu-HU',
'hy-AM',
'id-ID',
'is-IS',
'it-IT',
'ja-JP',
'ka-GE',
'kk-KZ',
'km-KH',
'kn-IN',
'kok-IN',
'ko-KR',
'ky-KG',
'lb-LU',
'lo-la',
'lt-LT',
'lv-LV',
'mi-NZ',
'mk-MK',
'ml-IN',
'mn-MN',
'mr-IN',
'ms-MY',
'mt-MT',
'nb-NO',
'ne-NP',
'nl-NL',
'nn-NO',
'or-IN',
'pa-IN',
'pl-PL',
'prs-AF',
'pt-BR',
'pt-PT',
'quz-PE',
'ro-Ro',
'ru-Ru',
'sd-Arab-PK',
'si-LK',
'sk-SK',
'sl-SI',
'sq-AL',
'sr-Cyrl-BA',
'sr-Cyrl-RS',
'sr-Latn-RS',
'sv-SE',
'sw-KE',
'ta-IN',
'te-IN',
'th-TH',
'tk-TM',
'tr-TR',
'tt-RU',
'ug-CN',
'uk-UA',
'ur-PK',
'uz-Latn-UZ',
'vi-VN',
'zh-CN',
'zh-TW'
];

private DiscoveryManager $discoveryManager;
private IRequest $request;
private IL10N $l10n;

private ?SimpleXMLElement $parsed = null;

public function __construct(DiscoveryManager $discoveryManager, IRequest $request, IL10N $l10n) {
$this->discoveryManager = $discoveryManager;
$this->request = $request;
$this->l10n = $l10n;
}

/**
* @param DiscoveryManager $discoveryManager
* @throws \Exception
*/
public function __construct(DiscoveryManager $discoveryManager) {
$this->discoveryManager = $discoveryManager;
public function getUrlSrc(string $mimetype): array {
$result = $this->getParsed()->xpath(sprintf('/wopi-discovery/net-zone/app[@name=\'%s\']/action', $mimetype));
if ($result && count($result) > 0) {
return [
'urlsrc' => (string)$result[0]['urlsrc'],
'action' => (string)$result[0]['name'],
];
}

throw new \Exception('Could not find urlsrc in WOPI');
}

/**
* @param $mimetype
* @return array
* @return SimpleXMLElement|bool
* @throws \Exception
*/
public function getUrlSrc($mimetype) {
public function getParsed() {
if (!empty($this->parsed)) {
return $this->parsed;
}
$discovery = $this->discoveryManager->get();
// In PHP 8.0 and later, PHP uses libxml versions from 2.9.0, which disabled XXE by default. libxml_disable_entity_loader() is now deprecated.
// Ref.: https://php.watch/versions/8.0/libxml_disable_entity_loader-deprecation
if (\PHP_VERSION_ID < 80000) {
$loadEntities = libxml_disable_entity_loader(true);
$discoveryParsed = simplexml_load_string($discovery);
libxml_disable_entity_loader($loadEntities);
} else {
$discoveryParsed = simplexml_load_string($discovery);
}
$this->parsed = $discoveryParsed;
return $discoveryParsed;
}

public function getUrlSrcForFile(File $file, bool $edit = true): string {
$protocol = $this->request->getServerProtocol();
$fallbackProtocol = $protocol === 'https' ? 'http' : 'https';

$result = $discoveryParsed->xpath(sprintf('/wopi-discovery/net-zone/app[@name=\'%s\']/action', $mimetype));
if ($result && count($result) > 0) {
return [
'urlsrc' => (string)$result[0]['urlsrc'],
'action' => (string)$result[0]['name'],
];
$netZones = [
'external-' . $protocol,
'internal-' . $protocol,
'external-' . $fallbackProtocol,
'internal-' . $fallbackProtocol,
];

$actions = [
$edit && $file->getSize() === 0 ? self::ACTION_EDITNEW : null,
$edit ? self::ACTION_EDIT : null,
self::ACTION_VIEW,
];
$actions = array_filter($actions);

foreach ($netZones as $netZone) {
foreach ($actions as $action) {
$result = $this->getUrlSrcByExtension($netZone, $file->getExtension(), $action);
if ($result) {
return $this->replaceUrlSrcParams($result);
}
}
}

foreach ($netZones as $netZone) {
$result = $this->getUrlSrcByMimetype($netZone, $file->getMimeType());
if ($result) {
return $this->replaceUrlSrcParams($result);
}
}

throw new \Exception('Could not find urlsrc in WOPI');
}

private function getUrlSrcByExtension(string $netZoneName, string $actionExt, $actionName): ?string {
$result = $this->getParsed()->xpath(sprintf(
'/wopi-discovery/net-zone[@name=\'%s\']/app/action[@ext=\'%s\' and @name=\'%s\']',
$netZoneName, $actionExt, $actionName
));

if (!$result || count($result) === 0) {
return null;
}

return (string)current($result)->attributes()['urlsrc'];
}

private function getUrlSrcByMimetype(string $netZoneName, string $mimetype): ?string {
$result = $this->getParsed()->xpath(sprintf(
'/wopi-discovery/net-zone[@name=\'%s\']/app[@name=\'%s\']/action',
$netZoneName, $mimetype
));

if (!$result || count($result) === 0) {
return null;
}

return (string)current($result)->attributes()['urlsrc'];
}

private function replaceUrlSrcParams(string $urlSrc): string {
if (!str_contains($urlSrc, 'UI_LLCC')) {
return $urlSrc;
}

$urlSrc = preg_replace('/<ui=UI_LLCC&>/', 'ui=' . $this->getLanguageCode() . '&', $urlSrc);
return preg_replace('/<.+>/', '', $urlSrc);
}

private function getLanguageCode(): string {
$languageCode = $this->l10n->getLanguageCode();
$localeCode = $this->l10n->getLocaleCode();
$splitLocale = explode('_', $localeCode);
if (count($splitLocale) > 1) {
$localeCode = $splitLocale[1];
}

$languageMatches = array_filter(self::SUPPORTED_LANGUAGES, function ($language) use ($languageCode, $localeCode) {
return stripos($language, $languageCode) === 0;
});

// Unique match on the language
if (count($languageMatches) === 1) {
return array_shift($languageMatches);
}
$localeMatches = array_filter($languageMatches, function ($language) use ($languageCode, $localeCode) {
return stripos($language, $languageCode . '-' . $localeCode) === 0;
});

// Matches with language and locale with region
if (count($localeMatches) >= 1) {
return array_shift($localeMatches);
}

// Fallback to first language match if multiple found and no fitting region is available
if (count($languageMatches) > 1) {
return array_shift($languageMatches);
}

return 'en-US';
}
}

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