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loader.go
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loader.go
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package config
import (
"bytes"
"fmt"
"net"
"os"
"regexp"
"strings"
"github.com/aserto-dev/self-decision-logger/logger/self"
builder "github.com/aserto-dev/service-host"
"github.com/aserto-dev/topaz/pkg/cli/cc"
"github.com/mitchellh/mapstructure"
"github.com/spf13/viper"
)
type Loader struct {
Configuration *Config
HasTopazDir bool
}
var envRegex = regexp.MustCompile(`(?U:\${.*})`)
type replacer struct {
r *strings.Replacer
}
func newReplacer() *replacer {
return &replacer{r: strings.NewReplacer(".", "_")}
}
func (r replacer) Replace(s string) string {
if s == "TOPAZ_VERSION" {
// Prevent the `version` field from be overridden by env vars.
return ""
}
return r.r.Replace(s)
}
func LoadConfiguration(fileName string) (*Loader, error) {
v := viper.NewWithOptions(viper.EnvKeyReplacer(newReplacer()))
v.SetConfigType("yaml")
v.AddConfigPath(".")
v.SetConfigFile(fileName)
v.SetEnvPrefix("TOPAZ")
// Set defaults
v.SetDefault("jwt.acceptable_time_skew_seconds", 5)
v.SetDefault("opa.max_plugin_wait_time_seconds", "30")
v.SetDefault("remote_directory.address", "0.0.0.0:9292")
v.SetDefault("remote_directory.insecure", "true")
v.AutomaticEnv()
fileContents, err := os.ReadFile(fileName)
if err != nil {
return nil, err
}
withTopazDir := false
if strings.Contains(string(fileContents), "TOPAZ_DIR") {
withTopazDir = true
}
cfg := new(Config)
subBuf, err := SetEnvVars(string(fileContents))
if err != nil {
return nil, err
}
r := bytes.NewReader([]byte(subBuf))
if err := v.ReadConfig(r); err != nil {
return nil, err
}
err = v.UnmarshalExact(cfg, func(dc *mapstructure.DecoderConfig) {
dc.TagName = "json"
})
if err != nil {
return nil, err
}
return &Loader{
Configuration: cfg,
HasTopazDir: withTopazDir,
}, nil
}
func (l *Loader) GetPaths() ([]string, error) {
paths := make(map[string]bool)
if l.Configuration.Edge.DBPath != "" {
paths[l.Configuration.Edge.DBPath] = true
}
if l.Configuration.APIConfig.Health.Certificates != nil {
if l.Configuration.APIConfig.Health.Certificates.TLSCACertPath != "" {
paths[l.Configuration.APIConfig.Health.Certificates.TLSCACertPath] = true
}
if l.Configuration.APIConfig.Health.Certificates.TLSCertPath != "" {
paths[l.Configuration.APIConfig.Health.Certificates.TLSCertPath] = true
}
if l.Configuration.APIConfig.Health.Certificates.TLSKeyPath != "" {
paths[l.Configuration.APIConfig.Health.Certificates.TLSKeyPath] = true
}
}
if l.Configuration.APIConfig.Metrics.Certificates != nil {
if l.Configuration.APIConfig.Metrics.Certificates.TLSCACertPath != "" {
paths[l.Configuration.APIConfig.Metrics.Certificates.TLSCACertPath] = true
}
if l.Configuration.APIConfig.Metrics.Certificates.TLSCertPath != "" {
paths[l.Configuration.APIConfig.Metrics.Certificates.TLSCertPath] = true
}
if l.Configuration.APIConfig.Metrics.Certificates.TLSKeyPath != "" {
paths[l.Configuration.APIConfig.Metrics.Certificates.TLSKeyPath] = true
}
}
servicePaths := getUniqueServiceCertPaths(l.Configuration.APIConfig.Services)
for i := range servicePaths {
paths[servicePaths[i]] = true
}
if l.Configuration.ControllerConfig != nil && l.Configuration.ControllerConfig.Enabled {
if l.Configuration.ControllerConfig.Server.CACertPath != "" {
paths[l.Configuration.ControllerConfig.Server.CACertPath] = true
}
if l.Configuration.ControllerConfig.Server.ClientCertPath != "" {
paths[l.Configuration.ControllerConfig.Server.ClientCertPath] = true
}
if l.Configuration.ControllerConfig.Server.ClientKeyPath != "" {
paths[l.Configuration.ControllerConfig.Server.ClientKeyPath] = true
}
}
decisionLogPaths, err := getDecisionLogPaths(l.Configuration.DecisionLogger)
if err != nil {
return nil, err
}
for i := range decisionLogPaths {
paths[decisionLogPaths[i]] = true
}
return filterPaths(paths), nil
}
func (l *Loader) GetPorts() ([]string, error) {
portMap := make(map[string]bool)
if l.Configuration.APIConfig.Health.ListenAddress != "" {
port, err := getPortFromAddress(l.Configuration.APIConfig.Health.ListenAddress)
if err != nil {
return nil, err
}
portMap[port] = true
}
if l.Configuration.APIConfig.Metrics.ListenAddress != "" {
port, err := getPortFromAddress(l.Configuration.APIConfig.Metrics.ListenAddress)
if err != nil {
return nil, err
}
portMap[port] = true
}
for _, value := range l.Configuration.APIConfig.Services {
if value.GRPC.ListenAddress != "" {
port, err := getPortFromAddress(value.GRPC.ListenAddress)
if err != nil {
return nil, err
}
portMap[port] = true
}
if value.Gateway.ListenAddress != "" {
port, err := getPortFromAddress(value.Gateway.ListenAddress)
if err != nil {
return nil, err
}
portMap[port] = true
}
}
// ensure unique assignment for each port
var args []string
for k := range portMap {
args = append(args, k)
}
return args, nil
}
func SetEnvVars(fileContents string) (string, error) {
err := os.Setenv("TOPAZ_CFG_DIR", cc.GetTopazCfgDir())
if err != nil {
return "", err
}
err = os.Setenv("TOPAZ_CERTS_DIR", cc.GetTopazCertsDir())
if err != nil {
return "", err
}
err = os.Setenv("TOPAZ_DB_DIR", cc.GetTopazDataDir())
if err != nil {
return "", err
}
return subEnvVars(fileContents), nil
}
func filterPaths(paths map[string]bool) []string {
var args []string
for k := range paths {
if k != "" { // append only not empty paths.
args = append(args, k)
}
}
return args
}
func getPortFromAddress(address string) (string, error) {
_, port, err := net.SplitHostPort(address)
if err != nil {
return "", err
}
return port, nil
}
func getUniqueServiceCertPaths(services map[string]*builder.API) []string {
paths := make(map[string]bool)
for _, service := range services {
if service.GRPC.Certs.TLSCACertPath != "" {
paths[service.GRPC.Certs.TLSCACertPath] = true
}
if service.GRPC.Certs.TLSCertPath != "" {
paths[service.GRPC.Certs.TLSCertPath] = true
}
if service.GRPC.Certs.TLSKeyPath != "" {
paths[service.GRPC.Certs.TLSKeyPath] = true
}
if service.Gateway.Certs.TLSCACertPath != "" {
paths[service.Gateway.Certs.TLSCACertPath] = true
}
if service.Gateway.Certs.TLSCertPath != "" {
paths[service.Gateway.Certs.TLSCertPath] = true
}
if service.Gateway.Certs.TLSKeyPath != "" {
paths[service.Gateway.Certs.TLSKeyPath] = true
}
}
var pathList []string
for k := range paths {
pathList = append(pathList, k)
}
return pathList
}
func getDecisionLogPaths(decisionLogConfig DecisionLogConfig) ([]string, error) {
switch decisionLogConfig.Type {
case "file":
logpath := fmt.Sprintf("%s", decisionLogConfig.Config["log_file_path"])
return []string{logpath}, nil
case "self":
selfCfg := self.Config{}
dec, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
Result: &selfCfg,
TagName: "json",
})
if err != nil {
return nil, err
}
err = dec.Decode(decisionLogConfig.Config)
if err != nil {
return nil, err
}
return []string{selfCfg.StoreDirectory, selfCfg.Scribe.CACertPath, selfCfg.Scribe.ClientCertPath, selfCfg.Scribe.ClientKeyPath}, nil
default:
return nil, nil // nop decision logger
}
}
// subEnvVars will look for any environment variables in the passed in string
// with the syntax of ${VAR_NAME} and replace that string with ENV[VAR_NAME].
func subEnvVars(s string) string {
updatedConfig := envRegex.ReplaceAllStringFunc(strings.ReplaceAll(s, `"`, `'`), func(s string) string {
// Trim off the '${' and '}'
if len(s) <= 3 {
// This should never happen..
return ""
}
varName := s[2 : len(s)-1]
// Lookup the variable in the environment. We play by
// bash rules.. if its undefined we'll treat it as an
// empty string instead of raising an error.
return os.Getenv(varName)
})
return updatedConfig
}