Fix story video upload probe path (#7203)

apiV1Add passed an absolute path to FFMpeg::open(), which laravel-ffmpeg
resolves relative to the local disk root, producing a doubled path and an
ffprobe 'Unable to probe / No such file or directory' failure.

Open the file via the disk instead: FFMpeg::fromDisk('local')->open($path)
for local storage, and an on-demand local disk rooted at the temp dir for
cloud storage.

Adds feature tests that pin the disk-relative path resolution.

app/Http/Controllers/StoryComposeController.php

@@ -91,16 +91,19 @@ class StoryComposeController extends Controller
         if ($story->type === 'video') {
 
             if ($localFs) {
-                $videoPath = storage_path('app/'.$path);
+                $media = FFMpeg::fromDisk('local')->open($path);
             } else {
-                $tempPath = sys_get_temp_dir().'/'.Str::random(40).'.mp4';
+                $tempName = Str::random(40).'.mp4';
+                $tempPath = sys_get_temp_dir().'/'.$tempName;
                 file_put_contents($tempPath, $disk->get($path));
-                $videoPath = $tempPath;
+                $media = FFMpeg::fromDisk(Storage::build([
+                    'driver' => 'local',
+                    'root' => sys_get_temp_dir(),
+                ]))->open($tempName);
             }
 
             try {
-                $video = FFMpeg::open($videoPath);
-                $duration = $video->getDurationInSeconds();
+                $duration = $media->getDurationInSeconds();
                 $res['media_duration'] = $duration;
 
                 if ($duration > 500) {

tests/Feature/Api/StoryVideoUploadPathTest.php

@@ -0,0 +1,84 @@
+<?php
+
+use App\Models\Story;
+use App\Models\User;
+use Illuminate\Foundation\Testing\LazilyRefreshDatabase;
+use Illuminate\Http\UploadedFile;
+use Illuminate\Support\Facades\Storage;
+
+uses(LazilyRefreshDatabase::class);
+
+beforeEach(function () {
+    Storage::fake('local');
+    config(['instance.stories.enabled' => true]);
+    config(['filesystems.default' => 'local']);
+});
+
+it('opens the uploaded story video via the local disk with a disk-relative path', function () {
+    $user = User::factory()->create();
+    $user->refresh();
+    $this->actingAs($user);
+
+    $captured = [];
+
+    // Swap the FFMpeg facade for a spy so we never shell out to ffprobe.
+    // fromDisk()/open() return the spy itself (fluent chain), and we record
+    // the disk + path the controller asks for.
+    $spy = Mockery::mock();
+    $spy->shouldReceive('fromDisk')->andReturnUsing(function ($disk) use (&$captured, $spy) {
+        $captured['disk'] = $disk;
+
+        return $spy;
+    });
+    $spy->shouldReceive('open')->andReturnUsing(function ($path) use (&$captured, $spy) {
+        $captured['path'] = $path;
+
+        return $spy;
+    });
+    $spy->shouldReceive('getDurationInSeconds')->andReturn(10);
+    \ProtoneMedia\LaravelFFMpeg\Support\FFMpeg::swap($spy);
+
+    $response = $this->postJson('/api/web/stories/v1/add', [
+        'file' => UploadedFile::fake()->create('story.mp4', 500, 'video/mp4'),
+    ]);
+
+    $response->assertOk();
+    expect($response->json('media_type'))->toBe('video');
+    expect($response->json('media_duration'))->toBe(10);
+
+    // Opened from the local disk...
+    expect($captured['disk'])->toBe('local');
+
+    // ...with a disk-relative path (the regression passed an absolute path).
+    $path = $captured['path'];
+    expect($path)->not->toStartWith('/');
+    expect($path)->not->toContain(storage_path());
+    expect($path)->toStartWith('public/_esm.t3/');
+
+    // And that disk-relative path resolves to the file that was actually
+    // stored, so ffprobe would find it.
+    Storage::disk('local')->assertExists($path);
+
+    $story = Story::whereProfileId($user->profile_id)->firstOrFail();
+    expect($story->type)->toBe('video');
+    expect($story->path)->toBe($path);
+});
+
+it('rejects a story video longer than the allowed duration', function () {
+    $user = User::factory()->create();
+    $user->refresh();
+    $this->actingAs($user);
+
+    $spy = Mockery::mock();
+    $spy->shouldReceive('fromDisk')->andReturnSelf();
+    $spy->shouldReceive('open')->andReturnSelf();
+    $spy->shouldReceive('getDurationInSeconds')->andReturn(501);
+    \ProtoneMedia\LaravelFFMpeg\Support\FFMpeg::swap($spy);
+
+    $response = $this->postJson('/api/web/stories/v1/add', [
+        'file' => UploadedFile::fake()->create('story.mp4', 500, 'video/mp4'),
+    ]);
+
+    $response->assertStatus(422);
+    expect(Story::whereProfileId($user->profile_id)->count())->toBe(0);
+});