Add new file box API

app/routing/middleware/api/DataInjection.middleware.js

@@ -1,4 +1,5 @@
 const { Middleware } = require('libflitter')
+const { ObjectId } = require('mongodb')
 
 class DataInjectionMiddleware extends Middleware {
     static get services() {
@@ -103,6 +104,45 @@ class DataInjectionMiddleware extends Middleware {
             req.form.file_group = file_group
         }
 
+        // Try to load in the file box
+        if ( req.params.FileBoxId ) {
+            const FileBox = this.models.get('api:files:FileBox')
+            const file_box = await FileBox.findOne({
+                UUID: req.params.FileBoxId,
+                pageId: req.params.PageId,
+                active: true,
+            })
+
+            if ( !file_box ) {
+                return res.status(404)
+                    .message('Invalid file box ID.')
+                    .api()
+            }
+
+            req.form.file_box = file_box
+
+            if ( req.params.FileBoxFileId ) {
+                const File = this.models.get('upload::File')
+                if ( !file_box.fileIds.includes(req.params.FileBoxFileId) ) {
+                    return res.status(400)
+                        .message('Invalid file box file ID.')
+                        .api()
+                }
+
+                const file = await File.findOne({
+                    _id: ObjectId(req.params.FileBoxFileId),
+                })
+
+                if ( !file ) {
+                    return res.status(400)
+                        .message('Invalid file box file ID.')
+                        .api()
+                }
+
+                req.form.file = file
+            }
+        }
+
         return next()
     }
 }