From 7f4657def4678ae0aec92a62af478a7903823eb4 Mon Sep 17 00:00:00 2001
From: Ahmad Altaher Alfayad <ahmadaltaher.alfayad@ucf.edu>
Date: Fri, 10 May 2024 12:59:34 -0400
Subject: [PATCH] add replacement functionality for pages and modules

---
 src/Lms/Canvas/CanvasApi.php | 99 +++++++++++++++++++++++++++++++++++-
 src/Lms/Canvas/CanvasLms.php | 45 +++++++++++++++-
 2 files changed, 142 insertions(+), 2 deletions(-)

diff --git a/src/Lms/Canvas/CanvasApi.php b/src/Lms/Canvas/CanvasApi.php
index 7415b049..cb2487b9 100644
--- a/src/Lms/Canvas/CanvasApi.php
+++ b/src/Lms/Canvas/CanvasApi.php
@@ -106,7 +106,7 @@ public function apiPost($url, $options, $sendAuthorized = true)
     }
 
     // Posts a file to Canvas
-    public function apiFilePost(string $url, array $options, string $filepath, string $newFileName): LmsResponse
+    public function apiFilePost(string $url, array $options, string $filepath, string $newFileName, $moduleInstances = null, $courseId = null, $replacePages = null) : LmsResponse
     {
         $fileResponse = $this->apiGet($url);
         $file = $fileResponse->getContent();
@@ -135,6 +135,59 @@ public function apiFilePost(string $url, array $options, string $filepath, strin
             'body' => $formData->bodyToIterable(),
         ], false);
 
+        $fileResponseContent = $fileResponse->getContent();
+
+        if($moduleInstances) {
+            foreach ($moduleInstances as $moduleInstance) {
+                $response = $this->apiPost("courses/{$courseId}/modules/{$moduleInstance}/items", [
+                    'json' => [
+                        'module_item' => [
+                            'title' => $newFileName,
+                            'type' => 'File',
+                            'content_id' => $fileResponseContent['id'],
+                        ],
+                    ],
+                ]);
+
+            }
+        }
+
+        if($replacePages) {
+            foreach ($replacePages as $page) {
+                $dom = new \DOMDocument();
+                $dom->loadHTML($page['body']);
+                $anchors = $dom->getElementsByTagName('a');
+                foreach ($anchors as $anchor) {
+                    preg_match('/files\/(\d+)/', $anchor->getAttribute('href'), $matches);
+                    if (isset($matches[1]) && $matches[1] == $file['id']) {
+                        $anchor->setAttribute('href', $fileResponseContent['url']);
+                        $anchor->setAttribute('title', $newFileName);
+                        $anchor->nodeValue = $newFileName;
+                    }
+                    $page['body'] = $dom->saveHTML();
+                    $response = $this->apiPut("courses/{$courseId}/pages/{$page['page_id']}", [
+                        'json' => [
+                            'wiki_page' => [
+                                'title' => $page['title'],
+                                'body' => $page['body'],
+                                'editing_roles' => $page['editing_roles'],
+                                'published' => $page['published'],
+                                'front_page' => $page['front_page'],
+                                'hide_from_students' => $page['hide_from_students'],
+                                'notify_of_update' => $page['notify_of_update'],
+                                'attachments' => [
+                                    [
+                                        'url' => $fileResponseContent['url'],
+                                        'filename' => $newFileName,
+                                    ],
+                                ],
+                            ],
+                        ],
+                    ]);
+                }
+            }
+        }
+
         return $fileResponse;
     }
 
@@ -189,4 +242,48 @@ public function apiDelete($url) {
 
     }
 
+    public function listModules($courseId)
+    {
+        $url = "courses/{$courseId}/modules";
+        $response = $this->apiGet($url);
+        return $response->getContent();
+    }
+
+    public function listModuleItems($courseId, $moduleId)
+    {
+        $url = "courses/{$courseId}/modules/{$moduleId}/items";
+        $response = $this->apiGet($url);
+        return $response->getContent();
+    }
+
+    public function deleteModuleItem($courseId, $moduleId, $itemId)
+    {
+        $url = "courses/{$courseId}/modules/{$moduleId}/items/{$itemId}";
+        $response = $this->apiDelete($url);
+        return $response->getContent();
+    }
+
+    public function listPages($courseId)
+    {
+        $url = "courses/{$courseId}/pages";
+        $response = $this->apiGet($url . '?include[]=body');
+
+        $responseWithPageBody = [];
+
+        foreach ($response->getContent() as $content) {
+            $page = $this->showPage($courseId, $content['page_id']);
+            $content['body'] = $page['body'];
+            $responseWithPageBody[] = $content;
+        }
+
+        return $responseWithPageBody;
+    }
+
+    public function showPage($courseId, $pageId)
+    {
+        $url = "courses/{$courseId}/pages/{$pageId}";
+        $response = $this->apiGet($url . '?include[]=body');
+        return $response->getContent();
+    }
+
 }
diff --git a/src/Lms/Canvas/CanvasLms.php b/src/Lms/Canvas/CanvasLms.php
index 341d41df..18332643 100644
--- a/src/Lms/Canvas/CanvasLms.php
+++ b/src/Lms/Canvas/CanvasLms.php
@@ -376,13 +376,44 @@ public function postFileItem(FileItem $file, string $newFileName)
         $apiDomain = $this->getApiDomain($user);
         $apiToken = $this->getApiToken($user);
         $canvasApi = new CanvasApi($apiDomain, $apiToken);
+        $modules = $canvasApi->listModules($file->getCourse()->getLmsCourseId());
+        $pages = $canvasApi->listPages($file->getCourse()->getLmsCourseId());
+        $refillModules = [];
+        $changePages = [];
+
+        // Delete any existing module items with the same file name
+        foreach ($modules as $module) {
+            $moduleItems = $canvasApi->listModuleItems($file->getCourse()->getLmsCourseId(), $module['id']);
+            $instances = $this->findFileInModuleItems($moduleItems, $file->getLmsFileId());
+            if (!empty($instances)) {
+                foreach ($instances as $instance) {
+                    $canvasApi->deleteModuleItem($file->getCourse()->getLmsCourseId(), $module['id'], $instance['id']);
+                }
+                $refillModules[] = $module['id'];
+            }
+        }
+
+        // Find all pages that contain this file in their HTML
+        foreach ($pages as $page) {
+            $dom = new \DOMDocument();
+            $dom->loadHTML($page['body']);
+            $anchors = $dom->getElementsByTagName('a');
+            foreach ($anchors as $anchor) {
+                preg_match('/files\/(\d+)/', $anchor->getAttribute('href'), $matches);
+                if(isset($matches[1]) && $matches[1] == $file->getLmsFileId()) {
+                    $changePages[] = $page;
+                    break;
+                }
+            }
+        }
+
         $url = "courses/{$file->getCourse()->getLmsCourseId()}/files/{$file->getLmsFileId()}";
         $filepath = $this->util->getTempPath() . '/file.' . $file->getId();
         $options = [
             'postUrl' => "courses/{$file->getCourse()->getLmsCourseId()}/files"
         ];
 
-        $fileResponse = $canvasApi->apiFilePost($url, $options, $filepath, $newFileName);
+        $fileResponse = $canvasApi->apiFilePost($url, $options, $filepath, $newFileName, $refillModules, $file->getCourse()->getLmsCourseId(), $changePages);
         $fileObj = $fileResponse->getContent();
 
         if (isset($fileObj['id'])) {
@@ -393,6 +424,18 @@ public function postFileItem(FileItem $file, string $newFileName)
         return $fileResponse;
     }
 
+    public function findFileInModuleItems($moduleItems, string $fileId)
+    {
+        $instances = [];
+        foreach ($moduleItems as $item) {
+            if ($item['content_id'] == $fileId) {
+                $instances[] = $item;
+            }
+        }
+
+        return $instances;
+    }
+
     public function getCourseUrl(Course $course, User $user)
     {
         $domain = $this->getApiDomain($user);