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<?php
namespace Common\Core\Policies;
use App\User;
use Arr;
use Common\Files\FileEntry;
use Common\Files\FileEntryUser;
use Illuminate\Auth\Access\HandlesAuthorization;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\MorphToMany;
use Illuminate\Support\Collection;
use Laravel\Sanctum\PersonalAccessToken;
use Laravel\Sanctum\Sanctum;
use Request;
class FileEntryPolicy
{
use HandlesAuthorization;
public function index(User $user, array $entryIds = null, int $userId = null): bool
{
if ($entryIds) {
return $this->userCan($user, 'files.view', $entryIds);
} else {
return $user->hasPermission('files.view') || $userId === $user->id;
}
}
public function show(?User $user, FileEntry $entry): bool
{
$token = $this->getAccessTokenFromRequest();
if ($token) {
if ($entry->preview_token === $token) {
return true;
} else if ($accessToken = app(PersonalAccessToken::class)->findToken($token)) {
$user = $accessToken->tokenable;
}
}
return $user && $this->userCan($user, 'files.view', $entry);
}
public function download(User $user, $entries): bool
{
$token = $this->getAccessTokenFromRequest();
if ($token) {
$previewTokenMatches = collect($entries)->every(function($entry) use($token) {
return $entry['preview_token'] === $token;
});
if ($previewTokenMatches) {
return true;
} else if ($accessToken = app(PersonalAccessToken::class)->findToken($token)) {
$user = $accessToken->tokenable;
}
}
return $this->userCan($user, 'files.download', $entries);
}
public function store(User $user, int $parentId = null): bool
{
//check if user can modify parent entry (if specified)
if ($parentId) {
return $this->userCan($user, 'files.update', [$parentId]);
}
return $user->hasPermission('files.create');
}
/**
* @param User $user
* @param Collection|array|FileEntry $entries
* @return bool
*/
public function update(User $user, $entries)
{
return $this->userCan($user, 'files.update', $entries);
}
/**
* @param User $user
* @param Collection|array|FileEntry $entries
* @return bool
*/
public function destroy(User $user, $entries)
{
return $this->userCan($user, 'files.delete', $entries);
}
/**
* @param User $currentUser
* @param string $permission
* @param FileEntry|array|Collection $entries
* @return bool
*/
protected function userCan(User $currentUser, string $permission, $entries)
{
if ($currentUser->hasPermission($permission)) {
return true;
}
$entries = $this->findEntries($entries);
// extending class might use "findEntries" method so we load users here
if ( ! $entries->every->relationLoaded('users')) {
$entries->load(['users' => function (MorphToMany $builder) use($currentUser) {
$builder->where('users.id', $currentUser->id);
}]);
}
return $entries->every(function(FileEntry $entry) use($permission, $currentUser) {
$user = $entry->users->find($currentUser->id);
return $this->userOwnsEntryOrWasGrantedPermission($user, $permission);
});
}
/**
* @param null|array|FileEntryUser $user
* @param string $permission
* @return bool
*/
public function userOwnsEntryOrWasGrantedPermission($user, string $permission)
{
return $user && ($user['owns_entry'] || Arr::get($user['entry_permissions'], $this->sharedFilePermission($permission)));
}
/**
* @param FileEntry|array|Collection $entries
* @return Collection
*/
protected function findEntries($entries)
{
if ($entries instanceof FileEntry) {
return $entries->newCollection([$entries]);
} else if (isset($entries[0]) && is_numeric($entries[0])) {
return app(FileEntry::class)
->whereIn('id', $entries)
->get();
} else {
return $entries;
}
}
protected function sharedFilePermission($fullPermission): string
{
switch ($fullPermission) {
case 'files.view':
return 'view';
case 'files.update':
return 'edit';
case 'files.delete';
return 'delete';
case 'files.download';
return 'download';
}
}
protected function getAccessTokenFromRequest(): ?string {
if ($token = request()->bearerToken()) {
return $token;
} else if ($token = request()->get('preview_token')) {
return $token;
} else if ($token = request()->get('accessToken')) {
return $token;
} else {
return null;
}
}
}