twins-upstream/CONFIGURATION.md
2020-11-04 12:48:55 -08:00

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This page is also available at [gemini://twins.rocketnine.space/configuration.gmi](gemini://twins.rocketnine.space/configuration.gmi)
`twins` requires a configuration file to operate. It is loaded from
`~/.config/twins/config.yaml` by default. You may specify a different location
via the `--config` argument.
# Configuration options
## Listen
Address to listen for connections on in the format of `interface:port`.
### Listen on localhost
`localhost:1965`
### Listen on all interfaces
`:1965`
## Hosts
Hosts are defined by their hostname followed by one or more paths to serve.
Paths may be defined as fixed strings or regular expressions (starting with `^`).
Paths are matched in the order they are defined.
Fixed string paths will match with and without a trailing slash.
When accessing a directory the file `index.gemini` or `index.gmi` is served.
### Certificates
A certificate and private key must be specified.
#### localhost certificate
Use `openssl` generate a certificate for localhost.
```bash
openssl req -x509 -out localhost.crt -keyout localhost.key \
-newkey rsa:2048 -nodes -sha256 \
-subj '/CN=localhost' -extensions EXT -config <( \
printf "[dn]\nCN=localhost\n[req]\ndistinguished_name = dn\n[EXT]\nsubjectAltName=DNS:localhost\nkeyUsage=digitalSignature\nextendedKeyUsage=serverAuth")
```
#### Domain certificate
Use [certbot](https://certbot.eff.org) to get a certificate from [Let's Encrypt](https://letsencrypt.org) for a domain.
```bash
certbot certonly --config-dir /home/www/certs \
--work-dir /home/www/certs \
--logs-dir /home/www/certs \
--webroot \
-w /home/www/gemini.rocks/public_html \
-d gemini.rocks \
-d www.gemini.rocks
```
Provide the path to the certificate file at `certs/live/$DOMAIN/fullchain.pem`
and the private key file at `certs/live/$DOMAIN/privkey.pem` to twins.
### Path
#### Resources
One resource must be defined for each path.
##### Root
Serve static files from specified root directory.
##### Proxy
Forward requests to Gemini server at specified URL.
Use the pseudo-scheme `gemini-insecure://` to disable certificate verification.
##### Command
Serve output of system command.
When input is requested from the user, it is available as a pseudo-variable
`$USERINPUT` which does not require surrounding quotes. It may be used as an
argument to the command, otherwise user input is passed via standard input.
#### Attributes
Any number of attributes may be defined for a path.
##### ListDirectory
Directory listing may be enabled by adding `listdirectory: true`.
##### Input
Request text input from user.
##### SensitiveInput
Request sensitive text input from the user. Text will not be shown as it is entered.
##### Type
Content type is normally detected automatically, defaulting to
`text/gemini; charset=utf-8`. This option forces a specific content type.
##### FastCGI
Forward requests to [FastCGI](https://en.wikipedia.org/wiki/FastCGI) server at
specified address or path.
A `Root` attribute must also be specified to use `FastCGI`.
# Example config.yaml
```yaml
# Address to listen on
listen: :1965
# TLS certificates
certificates:
-
# Hosts and paths to serve
hosts:
gemini.rocks:
cert: /srv/gemini.rocks/data/cert.crt
key: /srv/gemini.rocks/data/cert.key
paths:
-
path: ^/sites/.*\.php$
root: /home/geminirocks/data
fastcgi: unix:///var/run/php.sock
-
path: /sites
root: /home/geminirocks/data
listdirectory: true
-
path: ^/(help|info)$
root: /home/geminirocks/data/help
-
path: ^/proxy-example$
proxy: gemini://localhost:1966
-
path: ^/cmd-example$
command: uname -a
-
path: /
root: /home/geminirocks/data/home
twins.rocketnine.space:
cert: /srv/twins.rocketnine.space/data/cert.crt
key: /srv/twins.rocketnine.space/data/cert.key
paths:
-
path: /sites
root: /home/twins/data/sites
-
path: /
root: /home/twins/data/home
```