# Discourse

## Prepare Your Settings

In your auth project's settings file, do the following:

- Add `'allianceauth.services.modules.discourse',` to your `INSTALLED_APPS` list
- Append the following to your local.py settings file:

```python
# Discourse Configuration
DISCOURSE_URL = ''
DISCOURSE_API_USERNAME = ''
DISCOURSE_API_KEY = ''
DISCOURSE_SSO_SECRET = ''
```

## Install Docker

```bash
wget -qO- https://get.docker.io/ | sh
```

## Install Discourse

### Download Discourse

```bash
mkdir /var/discourse
git clone https://github.com/discourse/discourse_docker.git /var/discourse
```

### Configure

```bash
cd /var/discourse
cp samples/standalone.yml containers/app.yml
nano containers/app.yml
```

Change the following:

- `DISCOURSE_DEVELOPER_EMAILS` should be a list of admin account email addresses separated by commas.
- `DISCOUSE_HOSTNAME` should be `discourse.example.com` or something similar.
- Everything with `SMTP` depends on your mail settings. [There are plenty of free email services online recommended by Discourse](https://github.com/discourse/discourse/blob/master/docs/INSTALL-email.md#recommended-email-providers-for-discourse) if you haven't set one up for auth already.

To install behind Apache/Nginx, look for this section:

```ini
...
## which TCP/IP ports should this container expose?
expose:
    - "80:80"   # fwd host port 80   to container port 80 (http)
...
```

Change it to this:

```ini
...
## which TCP/IP ports should this container expose?
expose:
    - "7890:80"   # fwd host port 7890   to container port 80 (http)
...
```

Or any other port will do, if taken. Remember this number.

### Build and launch

```bash
nano /etc/default/docker
```

Uncomment this line:

```ini
    DOCKER_OPTS="--dns 8.8.8.8 --dns 8.8.4.4"
```

Restart Docker:

```bash
    service docker restart
```

Now build:

```bash
    ./launcher bootstrap app
    ./launcher start app
```

## Web Server Configuration

You will need to configure your web server to proxy requests to Discourse.

A minimal Apache config might look like:

```ini
<VirtualHost *:80>
    ServerName discourse.example.com
    ProxyPass / http://0.0.0.0:7890/
    ProxyPassReverse / http://0.0.0.0:7890/
</VirtualHost>
```

A minimal Nginx config might look like:

```ini
server {
    listen 80;
    server_name discourse.example.com;
    location / {
        include proxy_params;
        proxy_pass http://127.0.0.1:7890;
    }
}
```

## Configure API

### Generate admin account

From the `/var/discourse` directory,

```bash
./launcher enter app
rake admin:create
```

Follow prompts, being sure to answer `y` when asked to allow admin privileges.

### Create API key

Navigate to `discourse.example.com` and log on. Top right press the 3 lines and select `Admin`. Go to API tab and press `Generate Master API Key`.

Add the following values to your auth project's settings file:

- `DISCOURSE_URL`: `https://discourse.example.com` (do not add a trailing slash!)
- `DISCOURSE_API_USERNAME`: the username of the admin account you generated the API key with
- `DISCOURSE_API_KEY`: the key you just generated

### Configure SSO

Navigate to `discourse.example.com` and log in. Back to the admin site, scroll down to find SSO settings and set the following:

- `enable_sso`: True
- `sso_url`: `http://example.com/discourse/sso`
- `sso_secret`: some secure key

Save, now set `DISCOURSE_SSO_SECRET` in your auth project's settings file to the secure key you just put in Discourse.

Finally run migrations and restart Gunicorn and Celery.

## Permissions

To use this service, users will require some of the following.

```eval_rst
+---------------------------------------+------------------+--------------------------------------------------------------------------+
| Permission                            | Admin Site       | Auth Site                                                                |
+=======================================+==================+==========================================================================+
| discourse.access_discourse            | None             | Can Access the Discourse Service                                         |
+---------------------------------------+------------------+--------------------------------------------------------------------------+
```
