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/*
* Handle configuration
*
* Copyright (c) 2024 Runxi Yu <me@runxiyu.org>
* SPDX-License-Identifier: AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"bufio"
"errors"
"fmt"
"os"
"git.sr.ht/~emersion/go-scfg"
)
/*
* We use two structs. The first has all of its values as pointers, and scfg
* unmarshals the configuration to it. Then we take each value, dereference
* it, and throw it into a normal config struct without pointers.
* This means that any missing configuration options will simply cause a
* segmentation fault.
*/
var configWithPointers struct {
URL *string `scfg:"url"`
Prod *bool `scfg:"prod"`
Tmpl *string `scfg:"tmpl"`
Static *string `scfg:"static"`
Source *string `scfg:"source"`
Listen struct {
Proto *string `scfg:"proto"`
Net *string `scfg:"net"`
Addr *string `scfg:"addr"`
Trans *string `scfg:"trans"`
TLS struct {
Cert *string `scfg:"cert"`
Key *string `scfg:"key"`
} `scfg:"tls"`
} `scfg:"listen"`
DB struct {
Type *string `scfg:"type"`
Conn *string `scfg:"conn"`
} `scfg:"db"`
Auth struct {
Fake *int `scfg:"fake"`
Client *string `scfg:"client"`
Authorize *string `scfg:"authorize"`
Jwks *string `scfg:"jwks"`
Token *string `scfg:"token"`
Secret *string `scfg:"secret"`
Expr *int `scfg:"expr"`
} `scfg:"auth"`
Perf struct {
SendQ *int `scfg:"sendq"`
MessageArgumentsCap *int `scfg:"msg_args_cap"`
MessageBytesCap *int `scfg:"msg_bytes_cap"`
ReadHeaderTimeout *int `scfg:"read_header_timeout"`
} `scfg:"perf"`
}
var config struct {
URL string
Prod bool
Tmpl string
Static string
Source string
Listen struct {
Proto string
Net string
Addr string
Trans string
TLS struct {
Cert string
Key string
}
}
DB struct {
Type string
Conn string
}
Auth struct {
Fake int
Client string
Authorize string
Jwks string
Token string
Secret string
Expr int
}
Perf struct {
SendQ int
MessageArgumentsCap int
MessageBytesCap int
ReadHeaderTimeout int
} `scfg:"perf"`
}
var (
errAuthFakeProd = errors.New("auth.fake not allowed in production mode")
errAuthFakeInvalid = errors.New("invalid auth.fake value")
)
func fetchConfig(path string) error {
f, err := os.Open(path)
if err != nil {
return fmt.Errorf("error opening configuration file: %w", err)
}
err = scfg.NewDecoder(bufio.NewReader(f)).Decode(&configWithPointers)
if err != nil {
return fmt.Errorf("error decoding configuration file: %w", err)
}
config.URL = *(configWithPointers.URL)
config.Prod = *(configWithPointers.Prod)
config.Tmpl = *(configWithPointers.Tmpl)
config.Static = *(configWithPointers.Static)
config.Source = *(configWithPointers.Source)
config.Listen.Proto = *(configWithPointers.Listen.Proto)
config.Listen.Net = *(configWithPointers.Listen.Net)
config.Listen.Addr = *(configWithPointers.Listen.Addr)
config.Listen.Trans = *(configWithPointers.Listen.Trans)
if config.Listen.Trans == "tls" {
config.Listen.TLS.Cert = *(configWithPointers.Listen.TLS.Cert)
config.Listen.TLS.Key = *(configWithPointers.Listen.TLS.Key)
}
config.DB.Type = *(configWithPointers.DB.Type)
config.DB.Conn = *(configWithPointers.DB.Conn)
if configWithPointers.Auth.Fake == nil {
config.Auth.Fake = 0
} else {
config.Auth.Fake = *(configWithPointers.Auth.Fake)
switch config.Auth.Fake {
case 0:
/* It's okay to set it to 0 in production */
case 4712, 9080: /* Don't use them unless you know what you're doing */
if config.Prod {
return errAuthFakeProd
}
default:
return errAuthFakeInvalid
}
}
config.Auth.Client = *(configWithPointers.Auth.Client)
config.Auth.Authorize = *(configWithPointers.Auth.Authorize)
config.Auth.Jwks = *(configWithPointers.Auth.Jwks)
config.Auth.Token = *(configWithPointers.Auth.Token)
config.Auth.Secret = *(configWithPointers.Auth.Secret)
config.Auth.Expr = *(configWithPointers.Auth.Expr)
config.Perf.SendQ = *(configWithPointers.Perf.SendQ)
config.Perf.MessageArgumentsCap = *(configWithPointers.Perf.MessageArgumentsCap)
config.Perf.MessageBytesCap = *(configWithPointers.Perf.MessageBytesCap)
config.Perf.ReadHeaderTimeout = *(configWithPointers.Perf.ReadHeaderTimeout)
return nil
}
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