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package main
import (
"fmt"
"os"
"runtime"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/validation"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/version"
"github.com/spf13/pflag"
"go.yaml.in/yaml/v3"
)
func main() {
logger.SetFlags(logger.Lshortfile)
configFlagSet := pflag.NewFlagSet("oauth2-proxy", pflag.ContinueOnError)
// Because we parse early to determine alpha vs legacy config, we have to
// ignore any unknown flags for now
configFlagSet.ParseErrorsAllowlist.UnknownFlags = true
config := configFlagSet.String("config", "", "path to config file")
alphaConfig := configFlagSet.String("alpha-config", "", "path to alpha config file (use at your own risk - the structure in this config file may change between minor releases)")
convertConfig := configFlagSet.Bool("convert-config-to-alpha", false, "if true, the proxy will load configuration as normal and convert existing configuration to the alpha config structure, and print it to stdout")
showVersion := configFlagSet.Bool("version", false, "print version string")
configTest := configFlagSet.Bool("config-test", false, "test the configuration and exit")
configFlagSet.Parse(os.Args[1:])
if *showVersion {
fmt.Printf("oauth2-proxy %s (built with %s)\n", version.VERSION, runtime.Version())
return
}
if *convertConfig && *alphaConfig != "" {
logger.Fatal("cannot use alpha-config and convert-config-to-alpha together")
}
if *configTest && *convertConfig {
logger.Fatal("cannot use config-test and convert-config-to-alpha together")
}
opts, err := loadConfiguration(*config, *alphaConfig, configFlagSet, os.Args[1:])
if err != nil {
logger.Fatalf("ERROR: %v", err)
}
if *configTest {
if err = validation.Validate(opts); err != nil {
logger.Errorf("%s", err)
os.Exit(1)
}
fmt.Println("configuration is valid")
return
}
if *convertConfig {
if err := printConvertedConfig(opts); err != nil {
logger.Fatalf("ERROR: could not convert config: %v", err)
}
return
}
if err = validation.Validate(opts); err != nil {
logger.Fatalf("%s", err)
}
validator := NewValidator(opts.EmailDomains, opts.AuthenticatedEmailsFile)
oauthproxy, err := NewOAuthProxy(opts, validator)
if err != nil {
logger.Fatalf("ERROR: Failed to initialise OAuth2 Proxy: %v", err)
}
if err := oauthproxy.Start(); err != nil {
logger.Fatalf("ERROR: Failed to start OAuth2 Proxy: %v", err)
}
}
// loadConfiguration will load in the user's configuration.
// It will either load the alpha configuration (if alphaConfig is given)
// or the legacy configuration.
func loadConfiguration(config, yamlConfig string, extraFlags *pflag.FlagSet, args []string) (*options.Options, error) {
opts, err := loadLegacyOptions(config, extraFlags, args)
if err != nil {
return nil, fmt.Errorf("failed to load legacy options: %w", err)
}
if yamlConfig != "" {
logger.Printf("WARNING: You are using alpha configuration. The structure in this configuration file may change without notice. You MUST remove conflicting options from your existing configuration.")
opts, err = loadYamlOptions(yamlConfig, config, extraFlags, args)
if err != nil {
return nil, fmt.Errorf("failed to load yaml options: %w", err)
}
}
// Ensure defaults after loading configuration
opts.EnsureDefaults()
return opts, nil
}
// loadLegacyOptions loads the old toml options using the legacy flagset
// and legacy options struct.
func loadLegacyOptions(config string, extraFlags *pflag.FlagSet, args []string) (*options.Options, error) {
optionsFlagSet := options.NewLegacyFlagSet()
optionsFlagSet.AddFlagSet(extraFlags)
if err := optionsFlagSet.Parse(args); err != nil {
return nil, fmt.Errorf("failed to parse flags: %v", err)
}
legacyOpts := options.NewLegacyOptions()
if err := options.Load(config, optionsFlagSet, legacyOpts); err != nil {
return nil, fmt.Errorf("failed to load config: %v", err)
}
opts, err := legacyOpts.ToOptions()
if err != nil {
return nil, fmt.Errorf("failed to convert config: %v", err)
}
return opts, nil
}
// loadYamlOptions loads the old style config excluding options converted to
// the new alpha format, then merges the alpha options, loaded from YAML,
// into the core configuration.
func loadYamlOptions(yamlConfig, config string, extraFlags *pflag.FlagSet, args []string) (*options.Options, error) {
opts, err := loadOptions(config, extraFlags, args)
if err != nil {
return nil, fmt.Errorf("failed to load core options: %v", err)
}
alphaOpts := options.NewAlphaOptions(opts)
if err := options.LoadYAML(yamlConfig, alphaOpts); err != nil {
return nil, fmt.Errorf("failed to load alpha options: %v", err)
}
alphaOpts.MergeOptionsWithDefaults(opts)
return opts, nil
}
// loadOptions loads the configuration using the old style format into the
// core options.Options struct.
// This means that none of the options that have been converted to alpha config
// will be loaded using this method.
func loadOptions(config string, extraFlags *pflag.FlagSet, args []string) (*options.Options, error) {
optionsFlagSet := options.NewFlagSet()
optionsFlagSet.AddFlagSet(extraFlags)
if err := optionsFlagSet.Parse(args); err != nil {
return nil, fmt.Errorf("failed to parse flags: %v", err)
}
opts := options.NewOptions()
if err := options.Load(config, optionsFlagSet, opts); err != nil {
return nil, fmt.Errorf("failed to load config: %v", err)
}
return opts, nil
}
// printConvertedConfig extracts alpha options from the loaded configuration
// and renders these to stdout in YAML format.
func printConvertedConfig(opts *options.Options) error {
alphaConfig := options.NewAlphaOptions(opts)
// Generic interface for loading arbitrary yaml structure
var buffer map[string]interface{}
if err := options.Decode(alphaConfig, &buffer); err != nil {
return fmt.Errorf("unable to decode alpha config into interface: %w", err)
}
data, err := yaml.Marshal(buffer)
if err != nil {
return fmt.Errorf("unable to marshal config: %v", err)
}
if _, err := os.Stdout.Write(data); err != nil {
return fmt.Errorf("unable to write output: %v", err)
}
return nil
}