petrbalvin
3a38f00dc0
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Assisted-by: GLM 5.3 Flash
92 lines
2.7 KiB
Groff
92 lines
2.7 KiB
Groff
.TH NUNTIUS 1 2026-09-28 "nuntius 1.0.0" "nuntius manual"
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.SH NAME
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nuntius \- contact form backend
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.SH SYNOPSIS
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.B nuntius
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.RB [ \-\-version ]
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.RB [ \-\-check\-config ]
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.SH DESCRIPTION
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.B nuntius
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serves multiple JSON form endpoints (contact, feedback, newsletter,
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generic) from a single static binary, validates each submission, delivers
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it by SMTP and keeps per-form rate limits, CORS allowlists and a honeypot
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field. Newsletter forms use a double opt-in: the address is recorded only
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after the subscriber redeems the confirmation link from the mail.
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.PP
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Configuration is read from a TOML file, /etc/nuntius/config.toml by
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default. The first start writes a three-form starter template when the
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file does not exist, and every ${VAR} reference inside it is expanded
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from the environment before parsing, so secrets stay out of the file.
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With no flags the server listens on the configured address and serves
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until SIGINT or SIGTERM, then drains in-flight requests and exits.
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.SH OPTIONS
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.TP
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.B \-\-version
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Print the release the binary was built at, then exit. A build at a tag
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reports the tag, a build from a commit reports a pseudo-version naming
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that commit, and a build outside version control reports (devel); a dirty
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tree appends +dirty.
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.TP
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.B \-\-check\-config
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Load and validate the configuration file, then exit without listening.
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Exits nonzero and names the problem on any error, so it can run as a
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systemd ExecStartPre.
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.SH EXIT STATUS
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.TP
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.B 0
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The requested operation succeeded: the version was printed, the
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configuration is valid, or the server shut down cleanly.
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.TP
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.B 1
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The configuration is missing, invalid or fails validation, or the server
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failed to serve.
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.SH CONFIGURATION
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The full schema, every key with its type, default and effect, is in
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.I docs/CONFIGURATION.md
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in the repository. Configuration is one TOML file holding a
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.B [server]
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table, a
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.B data_dir
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and one or more
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.B [[forms]]
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entries, each with its own SMTP settings, rate limit, CORS allowlist and
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honeypot field.
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.SH ENVIRONMENT
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.TP
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.B NUNTIUS_CONFIG
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Path of the configuration file to read instead of
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/etc/nuntius/config.toml.
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.SH FILES
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.TP
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.I /etc/nuntius/config.toml
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The default configuration file; written as a starter template on first
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start when missing.
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.TP
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.I data_dir/newsletter-<name>.jsonl
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The append-only newsletter subscriber log, where data_dir is the
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configured data directory (./data by default).
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.SH EXAMPLES
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Print the release:
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.PP
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.RS
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.nf
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nuntius \-\-version
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.fi
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.RE
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.PP
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Validate a configuration without listening:
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.PP
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.RS
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.nf
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NUNTIUS_CONFIG=./config.toml nuntius \-\-check\-config
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.fi
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.RE
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.SH AUTHOR
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Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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.SH LICENCE
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MIT License
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.SH SEE ALSO
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.IR docs/CONFIGURATION.md ,
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.IR docs/API.md ,
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.IR docs/DEPLOYMENT.md
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