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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, CSV. The above mentioned formats are also available for viewing together with PDF. 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.
You can also use our **[Docker installation](https://github.com/ONLYOFFICE/docker-onlyoffice-owncloud)** to get installed and configured Document Server and ownCloud installation with a couple of commands.
## 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 4.2.7 and later are supported for use with the app). If that is not the case, use the official ONLYOFFICE Document Server documentation 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/Nextcloud 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. Go to the ownCloud/Nextcloud server _apps/_ directory (or some other directory [used](https://doc.owncloud.org/server/9.0/admin_manual/installation/apps_management_installation.html#using-custom-app-directories)):
```
cd apps/
```
2. Get the ownCloud/Nextcloud ONLYOFFICE integration app. There are several ways to do that:
a. Download the latest signed version from the official store for [ownCloud 9](https://apps.owncloud.com/content/show.php?content=174798), [ownCloud 10](https://marketplace.owncloud.com/apps/onlyoffice) or [Nextcloud](https://apps.nextcloud.com/apps/onlyoffice).
b. Or you can download the latest signed version from the application [release page](https://github.com/ONLYOFFICE/onlyoffice-owncloud/releases) on GitHub.
c. Or you can clone the application source code and compile it yourself:
```
git clone https://github.com/ONLYOFFICE/onlyoffice-owncloud.git onlyoffice
```
> ownCloud version 10 does not work with unsigned applications giving an alert, so you will need to use either option **a** or **b** to get the application.
2. Change the owner to update the application right from ownCloud/Nextcloud web interface:
```
chown -R www-data:www-data onlyoffice
```
3. 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. Enter the following address to connect ONLYOFFICE Document Server:
```
https://<documentserver>/
```
Where the **documentserver** is the name of the server with the ONLYOFFICE Document Server installed. The address must be accessible for the user browser and from the ownCloud/Nextcloud server. The ownCloud/Nextcloud server address must also be accessible from ONLYOFFICE Document Server for correct work.
Sometimes your network configuration might not allow the requests between installed ownCloud/Nextcloud and ONLYOFFICE Document Server using the public addresses. The _Advanced server settings_ allows to set the ONLYOFFICE Document Server address for internal requests from ownCloud/Nextcloud server and the returning ownCloud/Nextcloud address for the internal requests from ONLYOFFICE Document Server. You need to enter them in the appropriate fields.
To restrict the access to ONLYOFFICE Document Server and for security reasons and data integrity the encrypted signature is used. Specify the _Secret key_ in the ownCloud/Nextcloud administrative configuration. In the ONLYOFFICE Document Server [config file](https://api.onlyoffice.com/editors/signature/) specify the same secret key and enable the validation.
Enable or disable the _Open file in the same tab_ setting.
The **Open in ONLYOFFICE** action will be added to the file context menu. You can specify this action as default and it will be used when the file name is clicked for the selected file types.
## 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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