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WebDAV

You can use any WebDAV server to handle your image uploads in HedgeDoc.

The WebDAV server must host the files in a way that allows HedgeDoc to request and receive them.

You just add the following lines to your configuration:
(with the appropriate substitution for <CONNECTION_STRING>, <UPLOAD_DIR>, and <PUBLIC_URL> of course)

HD_MEDIA_BACKEND="webdav"
HD_MEDIA_BACKEND_WEBDAV_CONNECTION_STRING="<CONNECTION_STRING>"
HD_MEDIA_BACKEND_WEBDAV_UPLOAD_DIR="<UPLOAD_DIR>"
HD_MEDIA_BACKEND_WEBDAV_PUBLIC_URL="<PUBLIC_URL>"

The <CONNECTION_STRING> should include the username and password (if needed) in the familiar way of schema://user:password@url.

With <UPLOAD_DIR> you can specify a folder you want to upload to, but you can also omit this (just don't spcify this value at all), if you prefer to upload directly to the root of the WebDAV server.

Finally, <PUBLIC_URL> specifies with which url HedgeDoc can access the upload. For this purpose the filename will be appended to <PUBLIC_URL>. So the file test.png with <PUBLIC_URL> https://dav.example.com should be accessible via https://dav.example.com/test.png.

Using Nextcloud

If you want to use Nextcloud as a WebDAV server, follow the following instructions:

This guide was written using Nextcloud 21 in April 2021.

Because the username and app password will be included in the config, we suggest using a dedicated Nextcloud user for the uploads.

In this example the username will be TestUser.

  1. Create an app password by going to Settings > Security. Nextcloud will generate a password for you. Let's assume it's passw0rd.
  2. In the Files app create a new folder that will hold your uploads (e.g HedgeDoc).
  3. Share the newly created folder. The folder should (per default) be configured with the option Read Only (which we will assume in this guide), but Allow upload and editing should be fine, too.
  4. Get the public link of the share. It should be in your clipboard after creation. If not you can copy it by clicking the clipboard icon at the end of the line of Share link. We'll assume it is https://cloud.example.com/s/some-id in the following.
  5. Append /download?path=%2F&files= to this URL. To continue with our example the url should now be https://cloud.example.com/s/some-id/download?path=%2F&files=.
  6. Get the WebDAV url of you Nextcloud server. It should be located in the Files app in the bottom left corner under Settings > WebDAV. We'll assume it is https://cloud.example.com/remote.php/dav/files/TestUser/ in the following.
  7. Add your login information to the link. This is done by adding username:password@ in between the url schema (typically https://) and the rest of the url (cloud.example.com/remote.php/dav/files/TestUser/ in our example). The WebDAV url in our example should now look like this https://TestUser:passw0rd@cloud.example.com/remote.php/dav/files/TestUser/.
  8. Configure HedgeDoc:
HD_MEDIA_BACKEND="webdav"
HD_MEDIA_BACKEND_WEBDAV_CONNECTION_STRING="https://TestUser:passw0rd@cloud.example.com/remote.php/dav/files/TestUser/"
HD_MEDIA_BACKEND_WEBDAV_UPLOAD_DIR="HedgeDoc"
HD_MEDIA_BACKEND_WEBDAV_PUBLIC_URL="https://cloud.example.com/s/some-id/download?path=%2F&files="

Start using image uploads backed by Nextclouds WebDAV server.