feat: file deletion

4 files changed, 118 insertions, 5 deletions

diff --git a/public/delete.php b/public/delete.php
new file mode 100644
index 0000000..161c6ed
--- /dev/null
+++ b/public/delete.php
@@ -0,0 +1,64 @@
+<?php
+include_once $_SERVER['DOCUMENT_ROOT'] . '/../config.php';
+include_once $_SERVER['DOCUMENT_ROOT'] . '/../lib/utils.php';
+
+if (!FILE_DELETION) {
+    json_response(null, 'File deletion is not allowed!', 403);
+    exit();
+}
+
+$file_id = $_GET['f'] ?: null;
+$password = $_GET['key'] ?: null;
+
+if (!isset($file_id, $password)) {
+    json_response(null, "Fields 'f' and 'key' must be set!", 400);
+    exit();
+}
+
+$file_id = explode('.', $file_id);
+$file_ext = $file_id[1];
+$file_id = $file_id[0];
+
+if (!preg_match('/^[a-zA-Z0-9_-]+$/', $file_id) || !preg_match('/^[a-zA-Z0-9]+$/', $file_ext)) {
+    json_response(null, "Invalid file ID or extension", 400);
+    exit();
+}
+
+if (!is_file(FILE_UPLOAD_DIRECTORY . "/{$file_id}.{$file_ext}")) {
+    json_response(null, "File {$file_id} not found", 404);
+    exit();
+}
+
+if (!is_file(FILE_METADATA_DIRECTORY . "/{$file_id}.metadata.json")) {
+    json_response(null, "File metadata {$file_id} not found", 404);
+    exit();
+}
+
+$metadata = json_decode(file_get_contents(FILE_METADATA_DIRECTORY . "/{$file_id}.metadata.json"), true);
+
+if (!array_key_exists('password', $metadata)) {
+    json_response(null, "File {$file_id} does not have a password. File cannot be deleted!", 400);
+    exit();
+}
+
+if (!password_verify($password, $metadata['password'])) {
+    json_response(null, "Bad password", 401);
+    exit();
+}
+
+if (
+    !unlink(FILE_UPLOAD_DIRECTORY . "/{$file_id}.{$file_ext}") ||
+    !unlink(FILE_THUMBNAIL_DIRECTORY . "/{$file_id}.webp") ||
+    !unlink(FILE_METADATA_DIRECTORY . "/{$file_id}.metadata.json")
+) {
+    json_response(null, "Failed to delete a file ID {$file_id}", 500);
+    exit();
+}
+
+json_response(
+    [
+        'id' => $file_id,
+        'extension' => $file_ext
+    ],
+    'Successfully deleted the file'
+);
\ No newline at end of file
diff --git a/public/index.php b/public/index.php
index 9da069d..d6c759c 100644
--- a/public/index.php
+++ b/public/index.php
@@ -273,6 +273,10 @@ include_once $_SERVER['DOCUMENT_ROOT'] . '/../lib/partials.php';
         if (file.urls && file.urls.download_url) {
             file_url = file.urls.download_url;
         }
+        let file_deletion = '';
+        if (file.urls && file.urls.deletion_url) {
+            file_deletion = `<button onclick="deleteUploadedFile('${file.urls.deletion_url}', '${file.id}')">Delete</button>`;
+        }
 
         return `
         <div class="box item column gap-4 pad-4">
@@ -292,11 +296,36 @@ include_once $_SERVER['DOCUMENT_ROOT'] . '/../lib/partials.php';
                 <a href="${file_url}">
                     <button>Open</button>
                 </a>
+                ${file_deletion}
             </div>
         </div>
         `;
     }
 
+    function deleteUploadedFile(url, id) {
+        fetch(url, {
+            'headers': {
+                'Accept': 'application/json'
+            },
+            'method': 'DELETE'
+        }).then((r) => r.json())
+            .then((json) => {
+                if (json.status_code != 200) {
+                    alert(`${json.message} (${json.status_code})`);
+                    return;
+                }
+
+                let files = getUploadedFiles();
+                files = files.filter((x) => x.id !== id);
+                localStorage.setItem('uploaded_files', JSON.stringify(files));
+                loadUploadedFiles();
+            })
+            .catch((err) => {
+                alert('Failed to delete the file. Look into the console!');
+                console.error(err);
+            });
+    }
+
     // loading already existing uploaded files
     function loadUploadedFiles() {
         let files = getUploadedFiles();
@@ -307,13 +336,9 @@ include_once $_SERVER['DOCUMENT_ROOT'] . '/../lib/partials.php';
             html += addUploadedFile(file);
         }
 
-        if (html.length > 0) {
-            uploadedFiles.parentElement.style.display = 'flex';
-        }
+        uploadedFiles.parentElement.style.display = html.length > 0 ? 'flex' : 'none';
 
         uploadedFiles.innerHTML = html;
-
-        localStorage.setItem('uploaded_files', JSON.stringify(files));
     }
 
     loadUploadedFiles();
diff --git a/public/upload.php b/public/upload.php
index 96d1f4b..1f5b838 100644
--- a/public/upload.php
+++ b/public/upload.php
@@ -162,11 +162,27 @@ try {
         'download_url' => INSTANCE_URL . "/{$file_data['id']}.{$file_data['extension']}"
     ];
 
+    if (FILE_METADATA && FILE_DELETION) {
+        $file_data['password'] = $_POST['password'] ?? generate_random_char_sequence(FILE_ID_CHARACTERS, FILE_DELETION_KEY_LENGTH);
+        $file_data['urls']['deletion_url'] = INSTANCE_URL . "/delete.php?f={$file_data['id']}.{$file_data['extension']}&key={$file_data['password']}";
+    }
+
     if ($_SERVER['HTTP_ACCEPT'] == 'application/json') {
         json_response($file_data, null, 201);
     } else {
         header("Location: /{$file_data['id']}.{$file_data['extension']}");
     }
+
+    if (FILE_METADATA) {
+        unset($file_data['urls']);
+        $file_data['password'] = password_hash($file_data['password'], PASSWORD_DEFAULT);
+        if (!is_dir(FILE_METADATA_DIRECTORY) && !mkdir(FILE_METADATA_DIRECTORY, 0777, true)) {
+            throw new RuntimeException('Failed to create a folder for file metadata');
+        }
+        if (!file_put_contents(FILE_METADATA_DIRECTORY . "/{$file_data['id']}.metadata.json", json_encode($file_data, JSON_UNESCAPED_SLASHES))) {
+            throw new RuntimeException('Failed to create a file metadata');
+        }
+    }
 } catch (RuntimeException $e) {
     if ($_SERVER['HTTP_ACCEPT'] == 'application/json') {
         json_response(null, $e->getMessage(), 400);
diff --git a/public/uploaders.php b/public/uploaders.php
index 57cf8b4..ed0478a 100644
--- a/public/uploaders.php
+++ b/public/uploaders.php
@@ -75,6 +75,10 @@ foreach (FILE_ACCEPTED_MIME_TYPES as $k => $v) {
                             <th>URL:</th>
                             <td><code class="copy">{json:data.urls.download_url}</code></td>
                         </tr>
+                        <tr>
+                            <th>Deletion URL:</th>
+                            <td><code class="copy">{json:data.urls.deletion_url}</code></td>
+                        </tr>
                     </table>
                     <p>Then, select it via <b>Destinations &rarr; Image uploader &rarr; Custom image
                             uploader</b></p>
@@ -103,6 +107,10 @@ foreach (FILE_ACCEPTED_MIME_TYPES as $k => $v) {
                             <th>Image link:</th>
                             <td><code class="copy">{data.urls.download_url}</code></td>
                         </tr>
+                        <tr>
+                            <th>Deletion link:</th>
+                            <td><code class="copy">{data.urls.deletion_url}</code></td>
+                        </tr>
                     </table>
                 </section>
             </div>