Fix duplicate folder creations during import

During import you are able to select an existing folder, or with
Bitwarden exports it can contain existing folders already. In either
case it didn't matter, we always created new folders.

Bitwarden uses the same UUID of the selected or existing folders if they
are already there.

This PR fixes this by using the same behaviour.

Fixes dani-garcia#4700

src/api/core/ciphers.rs

@@ -562,24 +562,31 @@ async fn post_ciphers_import(
     Cipher::validate_notes(&data.ciphers)?;
 
     // Read and create the folders
-    let mut folders: Vec<_> = Vec::new();
+    let existing_folders: Vec<String> =
+        Folder::find_by_user(&headers.user.uuid, &mut conn).await.into_iter().map(|f| f.uuid).collect();
+    let mut folders: Vec<String> = Vec::with_capacity(data.folders.len());
     for folder in data.folders.into_iter() {
-        let mut new_folder = Folder::new(headers.user.uuid.clone(), folder.name);
-        new_folder.save(&mut conn).await?;
+        let folder_uuid = if folder.id.is_some() && existing_folders.contains(&folder.id.clone().unwrap()) {
+            folder.id.unwrap()
+        } else {
+            let mut new_folder = Folder::new(headers.user.uuid.clone(), folder.name);
+            new_folder.save(&mut conn).await?;
+            new_folder.uuid
+        };
 
-        folders.push(new_folder);
+        folders.push(folder_uuid);
     }
 
     // Read the relations between folders and ciphers
-    let mut relations_map = HashMap::new();
+    let mut relations_map = HashMap::with_capacity(data.folder_relationships.len());
 
     for relation in data.folder_relationships {
         relations_map.insert(relation.key, relation.value);
     }
 
     // Read and create the ciphers
     for (index, mut cipher_data) in data.ciphers.into_iter().enumerate() {
-        let folder_uuid = relations_map.get(&index).map(|i| folders[*i].uuid.clone());
+        let folder_uuid = relations_map.get(&index).map(|i| folders[*i].clone());
         cipher_data.folder_id = folder_uuid;
 
         let mut cipher = Cipher::new(cipher_data.r#type, cipher_data.name.clone());

src/api/core/folders.rs

@@ -41,6 +41,7 @@ async fn get_folder(uuid: &str, headers: Headers, mut conn: DbConn) -> JsonResul
 #[serde(rename_all = "camelCase")]
 pub struct FolderData {
     pub name: String,
+    pub id: Option<String>,
 }
 
 #[post("/folders", data = "<data>")]