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NextCloud可通过插件实现在线编辑Office文档，不过前提是需要依赖于Collabora Online服务，记录一下操作过程。

部署Collabora Online服务

Collabora Online提供多种平台和多种安装方式，这篇文章使用Linux Docker方式来一键部署。

CentOS安装Docker

#安装docker
yum -y install docker
#运行docker
service docker start
#设置docker开机启动
systemctl enable docker

Docker部署Collabora Online

#部署Collabora Online
docker pull collabora/code
#运行Collabora Online
docker run -t -d -p 127.0.0.1:9980:9980 -e "domain=<your-dot-escaped-domain>" \
        -e "username=admin" -e "password=S3cRet" --restart always --cap-add MKNOD collabora/code

注意上面的<your-dot-escaped-domain>指的是WOPI主机，也就是您NextCloud所使用的域名，多个域名可以用|进行分隔，您需要在命令行中使用双反斜杠，因为shell会转义第一个，而domain参数会使用正则表达式。

比如您NextCloud域名是https://cloud.ttt.sh/，那么输入的命令应该是如下：

docker run -t -d -p 127.0.0.1:9980:9980 -e "domain=cloud\\.ttt\\.sh" \
        -e "username=admin" -e "password=S3cRet" --restart always --cap-add MKNOD collabora/code

• username：后面是用户名
• password：后面是密码

账号、密码请根据自己需要进行调整，如果不报错应该是安装成功了，输入命令netstat -apn|grep '9980'看到如下截图说明Collabora Online已经正常运行。

Nginx反向代理Collabora Online

上一个步骤Collabora Online虽然已经安装成功，但是只能内网访问，假如您需要公网方式来提供服务，可以使用Nginx反向代理。以下是xiaoz的Nginx反向代理配置，供参考：

server
    {
    listen 443 ssl http2;
    #listen [::]:443 ssl http2;
    # certs sent to the client in SERVER HELLO are concatenated in ssl_certificate
    ssl_certificate /data/ssl/ttt.sh.crt;
    ssl_certificate_key /data/ssl/ttt.sh.key;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:50m;
    ssl_session_tickets off;

    # intermediate configuration. tweak to your needs.
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
    ssl_prefer_server_ciphers on;
    # OCSP Stapling ---
    # fetch OCSP records from URL in ssl_certificate and cache them
    ssl_stapling on;
    ssl_stapling_verify on;

    server_name     office.ttt.sh;
    # static files
    location ^~ /loleaflet {
        proxy_pass https://localhost:9980;
        proxy_set_header Host $http_host;
    }

    # WOPI discovery URL
    location ^~ /hosting/discovery {
        proxy_pass https://localhost:9980;
        proxy_set_header Host $http_host;
    }

    # main websocket
    location ~ ^/lool/(.*)/ws$ {
        proxy_pass https://localhost:9980;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $http_host;
        proxy_read_timeout 36000s;
    }

    # download, presentation and image upload
    location ~ ^/lool {
        proxy_pass https://localhost:9980;
        proxy_set_header Host $http_host;
    }

    # Admin Console websocket
    location ^~ /lool/adminws {
        proxy_pass https://localhost:9980;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";
        proxy_set_header Host $http_host;
        proxy_read_timeout 36000s;
    }

}
server
{
    listen 80;
    server_name office.ttt.sh;
    rewrite ^(.*) https://office.ttt.sh$1 permanent;
}

然后访问https://<CODE-domain>/loleaflet/dist/admin/admin.html可以进入Collabora Online控制台，至此Collabora Online服务已经部署完毕。

NextCloud设置

在NextCloud后台 - 应用 - 找到Collabora Online插件并启用。然后在设置 - 在线协助，填写Collabora Online的域名，如下截图。

最后打开NextCloud中的Office文档可以在线编辑了，如下截图。

总结

Collabora Online不仅可以为NextCloud为提供在线文档编辑，也可以让Seafile 支持Office预览。值得一提的是Collabora Online比较耗费内存，尤其是多人同时编辑文档的情况下，因此部署Collabora Online建议4G内存以上。

此文部分内容参考了：Collabora Online Development Edition (CODE)