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|
package main
import (
"fmt"
"net/netip"
"net/url"
"strings"
"github.com/hashicorp/hcl/v2/hclsimple"
)
type Config struct {
User string
Servers []ServerConfig
}
type ServerConfig struct {
Protocol string
Host string
Port int
RedirectToHTTPS bool
ACMEChallenge *ACMEChallengeConfig
TLSCertFile string
TLSKeyFile string
Proxies []ProxyConfig
}
type ACMEChallengeConfig struct {
Root string
}
type ProxyConfig struct {
Name string
From ProxyFromConfig
To ProxyToConfig
BasicAuth *ProxyBasicAuthConfig
}
type ProxyFromConfig struct {
Host string
Path string
}
type ProxyToConfig struct {
Host string
Port int
}
type ProxyBasicAuthConfig struct {
Realm string
CredentialFile string
}
type InternalHCLConfig struct {
User string `hcl:"user,optional"`
Servers []InternalHCLServerConfig `hcl:"server,block"`
}
type InternalHCLServerConfig struct {
Protocol string `hcl:"protocol,label"`
Host string `hcl:"host"`
Port int `hcl:"port"`
RedirectToHTTPS bool `hcl:"redirect_to_https,optional"`
ACMEChallenge []InternalHCLACMEChallengeConfig `hcl:"acme_challenge,block"`
TLSCertFile string `hcl:"tls_cert_file,optional"`
TLSKeyFile string `hcl:"tls_key_file,optional"`
Proxies []InternalHCLProxyConfig `hcl:"proxy,block"`
}
type InternalHCLACMEChallengeConfig struct {
Root string `hcl:"root"`
}
type InternalHCLProxyConfig struct {
Name string `hcl:"name,label"`
From InternalHCLProxyFromConfig `hcl:"from,block"`
To InternalHCLProxyToConfig `hcl:"to,block"`
Auths []InternalHCLProxyAuthConfig `hcl:"auth,block"`
}
type InternalHCLProxyFromConfig struct {
Host string `hcl:"host,optional"`
Path string `hcl:"path,optional"`
}
type InternalHCLProxyToConfig struct {
Host string `hcl:"host"`
Port int `hcl:"port"`
}
type InternalHCLProxyAuthConfig struct {
Scheme string `hcl:"scheme,label"`
Realm string `hcl:"realm"`
CredentialFile string `hcl:"credential_file"`
}
func fromHCLConfigToConfig(hclConfig *InternalHCLConfig) *Config {
servers := make([]ServerConfig, len(hclConfig.Servers))
for i, s := range hclConfig.Servers {
var acmeChallenge *ACMEChallengeConfig
if len(s.ACMEChallenge) != 0 {
acmeChallenge = &ACMEChallengeConfig{
Root: s.ACMEChallenge[0].Root,
}
}
proxies := make([]ProxyConfig, len(s.Proxies))
for j, p := range s.Proxies {
var basicAuth *ProxyBasicAuthConfig
if len(p.Auths) != 0 {
auth := p.Auths[0]
basicAuth = &ProxyBasicAuthConfig{
Realm: auth.Realm,
CredentialFile: auth.CredentialFile,
}
}
proxies[j] = ProxyConfig{
Name: p.Name,
From: ProxyFromConfig{
Host: p.From.Host,
Path: p.From.Path,
},
To: ProxyToConfig{
Host: p.To.Host,
Port: p.To.Port,
},
BasicAuth: basicAuth,
}
}
servers[i] = ServerConfig{
Protocol: s.Protocol,
Host: s.Host,
Port: s.Port,
RedirectToHTTPS: s.RedirectToHTTPS,
ACMEChallenge: acmeChallenge,
TLSCertFile: s.TLSCertFile,
TLSKeyFile: s.TLSKeyFile,
Proxies: proxies,
}
}
return &Config{
User: hclConfig.User,
Servers: servers,
}
}
func LoadConfig(fileName string) (*Config, error) {
var hclConfig InternalHCLConfig
err := hclsimple.DecodeFile(fileName, nil, &hclConfig)
if err != nil {
return nil, err
}
if len(hclConfig.Servers) == 0 {
return nil, fmt.Errorf("No server blocks found")
}
if 2 < len(hclConfig.Servers) {
return nil, fmt.Errorf("Too many server blocks found")
}
var listenHTTPS = false
var redirectToHTTPS = false
for _, server := range hclConfig.Servers {
if server.Protocol == "https" {
listenHTTPS = true
} else if server.Protocol != "http" {
return nil, fmt.Errorf("Invalid protocol %s", server.Protocol)
}
_, err = netip.ParseAddr(server.Host)
if err != nil {
return nil, fmt.Errorf("Invalid host %s", server.Host)
}
if len(server.ACMEChallenge) != 0 && len(server.ACMEChallenge) != 1 {
return nil, fmt.Errorf("Only one acme_challenge block is allowed")
}
if len(server.ACMEChallenge) != 0 && server.Protocol != "http" {
return nil, fmt.Errorf("accept_acme_challenge must be on http listener")
}
if server.RedirectToHTTPS {
redirectToHTTPS = true
if server.Protocol != "http" {
return nil, fmt.Errorf("redirect_to_https must be on http listener")
}
if len(server.Proxies) != 0 {
return nil, fmt.Errorf("redirect_to_https cannot be used with proxy")
}
}
if server.Protocol == "https" {
if server.TLSCertFile == "" {
return nil, fmt.Errorf("tls_cert_file is required for https listener")
}
if server.TLSKeyFile == "" {
return nil, fmt.Errorf("tls_key_file is required for https listener")
}
} else {
if server.TLSCertFile != "" {
return nil, fmt.Errorf("tls_cert_file is only allowed for https listener")
}
if server.TLSKeyFile != "" {
return nil, fmt.Errorf("tls_key_file is only allowed for https listener")
}
}
for _, p := range server.Proxies {
if p.From.Path != "" {
if !strings.HasPrefix(p.From.Path, "/") {
return nil, fmt.Errorf("Path must start with '/'")
}
if !strings.HasSuffix(p.From.Path, "/") {
return nil, fmt.Errorf("Path must end with '/'")
}
}
if p.From.Host == "" && p.From.Path == "" {
return nil, fmt.Errorf("Either host or path must be specified")
}
_, err := url.Parse(fmt.Sprintf("http://%s:%d", p.To.Host, p.To.Port))
if err != nil {
return nil, fmt.Errorf("Invalid host or port: %s:%d", p.To.Host, p.To.Port)
}
if 2 <= len(p.Auths) {
return nil, fmt.Errorf("Too many auth blocks found")
}
if len(p.Auths) == 1 {
auth := p.Auths[0]
if auth.Scheme != "basic" {
return nil, fmt.Errorf("Only basic auth is supported")
}
if auth.Realm == "" {
return nil, fmt.Errorf("realm is required")
}
if auth.CredentialFile == "" {
return nil, fmt.Errorf("credential_file is required")
}
}
}
}
if redirectToHTTPS && !listenHTTPS {
return nil, fmt.Errorf("redirect_to_https requires https listener")
}
return fromHCLConfigToConfig(&hclConfig), nil
}
|
