Adds code to delete the revision.

Signed-off-by: Abijeet <abijeetpatro@gmail.com>

app/Exceptions/BadRequestException.php

@@ -0,0 +1,14 @@
+<?php namespace BookStack\Exceptions;
+
+class BadRequestException extends PrettyException
+{
+
+    /**
+     * BadRequestException constructor.
+     * @param string $message
+     */
+    public function __construct($message = 'Bad request')
+    {
+        parent::__construct($message, 400);
+    }
+}

app/Http/Controllers/PageController.php

@@ -2,6 +2,7 @@
 
 use Activity;
 use BookStack\Exceptions\NotFoundException;
+use BookStack\Exceptions\BadRequestException;
 use BookStack\Repos\EntityRepo;
 use BookStack\Repos\UserRepo;
 use BookStack\Services\ExportService;
@@ -454,6 +455,38 @@ class PageController extends Controller
         return redirect($page->getUrl());
     }
 
+
+    /**
+     * Deletes a revision using the id of the specified revision.
+     * @param string $bookSlug
+     * @param string $pageSlug
+     * @param int $revisionId
+     * @throws NotFoundException
+     * @throws BadRequestException
+     * @return \Illuminate\Http\RedirectResponse|\Illuminate\Routing\Redirector
+     */
+    public function destroyRevision($bookSlug, $pageSlug, $revId)
+    {
+        $page = $this->entityRepo->getBySlug('page', $pageSlug, $bookSlug);
+        $this->checkOwnablePermission('page-update', $page);
+
+        $revision = $page->revisions()->where('id', '=', $revId)->first();
+        if ($revision === null) {
+            throw new NotFoundException("Revision #{$revId} not found");
+        }
+
+        // Get the current revision for the page
+        $current = $revision->getCurrent();
+
+        // Check if its the latest revision, cannot delete latest revision.
+        if (intval($current->id) === intval($revId)) {
+            throw new BadRequestException("Cannot delete the current revision #{$revId}");
+        }
+
+        $revision->delete();
+        return view('pages/revisions', ['page' => $page, 'book' => $page->book, 'current' => $page]);
+    }
+
     /**
      * Exports a page to a PDF.
      * https://github.com/barryvdh/laravel-dompdf

app/PageRevision.php

@@ -48,6 +48,18 @@ class PageRevision extends Model
         return null;
     }
 
+    /**
+     * Get the current revision for the same page if existing
+     * @return \BookStack\PageRevision|null
+     */
+    public function getCurrent()
+    {
+        if ($id = static::where('page_id', '=', $this->page_id)->max('id')) {
+            return static::find($id);
+        }
+        return null;
+    }
+
     /**
      * Allows checking of the exact class, Used to check entity type.
      * Included here to align with entities in similar use cases.

resources/assets/sass/_buttons.scss

@@ -119,6 +119,11 @@ $button-border-radius: 2px;
   &.neg {
     color: $negative;
   }
+  &.link {
+    &:hover {
+      text-decoration: underline;
+    }
+  }
 }
 
 .button-group {

resources/assets/sass/_lists.scss

@@ -367,7 +367,7 @@ ul.pagination {
     padding: $-xs $-m;
     line-height: 1.2;
   }
-  a {
+  a, button {
     display: block;
     padding: $-xs $-m;
     color: #555;
@@ -382,6 +382,10 @@ ul.pagination {
       width: 16px;
     }
   }
+  button {
+    width: 100%;
+    text-align: left;
+  }
   li.border-bottom {
     border-bottom: 1px solid #DDD;
   }

resources/assets/sass/_tables.scss

@@ -41,6 +41,9 @@ table.table {
   .text-center {
     text-align: center;
   }
+  td.actions {
+    overflow: visible;
+  }
 }
 
 table.no-style {

resources/views/pages/revisions.blade.php

@@ -36,16 +36,31 @@
                                 <td> @if($revision->createdBy) {{ $revision->createdBy->name }} @else {{ trans('common.deleted_user') }} @endif</td>
                                 <td><small>{{ $revision->created_at->format('jS F, Y H:i:s') }} <br> ({{ $revision->created_at->diffForHumans() }})</small></td>
                                 <td>{{ $revision->summary }}</td>
-                                <td>
+                                <td class="actions">
                                     <a href="{{ $revision->getUrl('changes') }}" target="_blank">{{ trans('entities.pages_revisions_changes') }}</a>
                                     <span class="text-muted">&nbsp;|&nbsp;</span>
 
+
                                     @if ($index === 0)
                                         <a target="_blank" href="{{ $page->getUrl() }}"><i>{{ trans('entities.pages_revisions_current') }}</i></a>
                                     @else
                                         <a href="{{ $revision->getUrl() }}" target="_blank">{{ trans('entities.pages_revisions_preview') }}</a>
                                         <span class="text-muted">&nbsp;|&nbsp;</span>
                                         <a href="{{ $revision->getUrl('restore') }}">{{ trans('entities.pages_revisions_restore') }}</a>
+                                        <span class="text-muted">&nbsp;|&nbsp;</span>
+                                        <div dropdown class="dropdown-container">
+                                            <button type="button" dropdown-toggle class="text-button link">{{ trans('common.delete') }}</button>
+                                            <ul>
+                                                <li class="padded"><small class="text-muted">{{trans('entities.revision_delete_confirm')}}</small></li>
+                                                <li>
+                                                    <form action="{{ $revision->getUrl('/delete/') }}" method="POST">
+                                                        {!! csrf_field() !!}
+                                                        <input type="hidden" name="_method" value="DELETE">
+                                                        <button type="submit" class="text-button neg">@icon('delete'){{ trans('common.delete') }}</button>
+                                                    </form>
+                                                </li>
+                                            </ul>
+                                        </div>
                                     @endif
                                 </td>
                             </tr>

resources/views/partials/custom-styles.blade.php

@@ -19,4 +19,4 @@
         color: {{ setting('app-color') }};
         fill: {{ setting('app-color') }};
     }
-</style>
+</style>

routes/web.php

@@ -61,6 +61,7 @@ Route::group(['middleware' => 'auth'], function () {
         Route::get('/{bookSlug}/page/{pageSlug}/revisions/{revId}', 'PageController@showRevision');
         Route::get('/{bookSlug}/page/{pageSlug}/revisions/{revId}/changes', 'PageController@showRevisionChanges');
         Route::get('/{bookSlug}/page/{pageSlug}/revisions/{revId}/restore', 'PageController@restoreRevision');
+        Route::delete('/{bookSlug}/page/{pageSlug}/revisions/{revId}/delete', 'PageController@destroyRevision');
 
         // Chapters
         Route::get('/{bookSlug}/chapter/{chapterSlug}/create-page', 'PageController@create');
@@ -79,7 +80,6 @@ Route::group(['middleware' => 'auth'], function () {
         Route::put('/{bookSlug}/chapter/{chapterSlug}/permissions', 'ChapterController@restrict');
         Route::get('/{bookSlug}/chapter/{chapterSlug}/delete', 'ChapterController@showDelete');
         Route::delete('/{bookSlug}/chapter/{chapterSlug}', 'ChapterController@destroy');
-
     });
 
     // User Profile routes