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#  ownCloud/Nextcloud ONLYOFFICE integration app
This app enables users to edit office documents from [ownCloud](https://owncloud.com)/[Nextcloud](https://nextcloud.com) using ONLYOFFICE Document Server. Currently the following document formats can be edited with this app: DOCX, XLSX, PPTX, TXT. The above mentioned formats are also available for viewing together with PDF and CSV. The edited files of the corresponding type can be converted into the Office Open XML formats: ODT, ODS, ODP, DOC, XLS, PPT, PPS, EPUB, RTF, HTML, HTM.
The app will create an item in the `new` (+) menu to create **Document**, **Spreadsheet**, **Presentation**. It will also create a new **Open in ONLYOFFICE** menu option within the document library for Office documents. This allows multiple users to collaborate in real time and to save back those changes to ownCloud/Nextcloud.
## Installing ONLYOFFICE Document Server
You will need an instance of ONLYOFFICE Document Server that is resolvable and connectable both from ownCloud/Nextcloud and any end clients (version 3.0 and later are supported for use with the app). If that is not the case, use the official ONLYOFFICE Document Server documetnations page: [Document Server for Linux](http://helpcenter.onlyoffice.com/server/linux/document/linux-installation.aspx). ONLYOFFICE Document Server must also be able to POST to ownCloud directly.
The easiest way to start an instance of ONLYOFFICE Document Server is to use [Docker](https://github.com/ONLYOFFICE/Docker-DocumentServer).
## Installing ownCloud/Nextcloud ONLYOFFICE integration app
To start using ONLYOFFICE Document Server with ownCloud/Nextcloud, the following steps must be performed:
1. Place ownCloud/Nextcloud ONLYOFFICE integration app to your ownCloud/Nextcloud server into the _/apps_ (or some other) directory, [used](https://doc.owncloud.org/server/9.0/admin_manual/installation/apps_management_installation.html#using-custom-app-directories) to connect applications:
```
cd apps/
git clone https://github.com/ONLYOFFICE/onlyoffice-owncloud.git onlyoffice
```
2. In ownCloud/Nextcloud open the `~/index.php/settings/apps?category=disabled` page with _Not enabled_ apps by administrator and click _Enable_ for the **ONLYOFFICE** application.
## Configuring ownCloud/Nextcloud ONLYOFFICE integration app
In ownCloud/Nextcloud open the `~/index.php/settings/admin#onlyoffice` page with administrative settings for **ONLYOFFICE** section and enter the address
```
https://<documentserver>
```
Where the **documentserver** is the name of the server with the ONLYOFFICE Document Server installed.
## How it works
The ONLYOFFICE integration follows the API documented here https://api.onlyoffice.com/editors/basic:
* When creating a new file, the user navigates to a document folder within ownCloud/Nextcloud and clicks the **Document**, **Spreadsheet** or **Presentation* item in the _new_ (+) menu.
* The browser invokes the `create` method in the `/lib/Controller/EditorController.php` controller. This method adds the copy of the file from the assets folder to the folder the user is currently in.
* Or, when opening an existing file, the user navigates to it within ownCloud/Nextcloud and selects the **Open in ONLYOFFICE** menu option.
* A new browser tab is opened and the `index` method of the `/lib/Controller/EditorController.php` controller is invoked.
* The app prepares a JSON object with the following properties:
* **url** - the URL that ONLYOFFICE Document Server uses to download the document;
* **callback** - the URL that ONLYOFFICE Document Server informs about status of the document editing;
* **documentServerUrl** - the URL that the client needs to reply to ONLYOFFICE Document Server (can be set at the administrative settings page);
* **key** - the UUID+Modified Timestamp to instruct ONLYOFFICE Document Server whether to download the document again or not;
* **fileName** - the document Title (name);
* **userId** - the identification of the user;
* **userName** - the name of the user.
* ownCloud/Nextcloud takes this object and constructs a page from `templates/editor.php` template, filling in all of those values so that the client browser can load up the editor.
* The client browser makes a request for the javascript library from ONLYOFFICE Document Server and sends ONLYOFFICE Document Server the DocEditor configuration with the above properties.
* Then ONLYOFFICE Document Server downloads the document from ownCloud/Nextcloud and the user begins editing.
* ONLYOFFICE Document Server sends a POST request to the _callback_ URL to inform ownCloud/Nextcloud that a user is editing the document.
* When all users and client browsers are done with editing, they close the editing window.
* After 10 seconds of inactivity, ONLYOFFICE Document Server sends a POST to the _callback_ URL letting ownCloud/Nextcloud know that the clients have finished editing the document and closed it.
* ownCloud/Nextcloud downloads the new version of the document, replacing the old one.
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