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package main
import (
"bytes"
"crypto/ed25519"
"crypto/x509"
"encoding/json"
"encoding/pem"
"errors"
"flag"
"fmt"
"log/slog"
"net/http"
"os"
"strings"
"github.com/go-chi/chi/v5"
"github.com/go-chi/chi/v5/middleware"
"github.com/google/go-jsonnet"
"github.com/peterbourgon/ff/v3"
"github.com/peterbourgon/ff/v3/ffyaml"
"github.com/yaronf/httpsign"
"gopkg.in/yaml.v3"
)
type args struct {
port int
pubKey string
pubKeyFile string
logLevel slog.Level
logJSON bool
}
const magicKey = "woodpcecker-ci-extensions"
func maine() error {
var args args
fs := flag.NewFlagSet("jsonnetpecker", flag.ExitOnError)
fs.String("config", ".config.yaml", "Path to config file")
fs.IntVar(&args.port, "port", args.port, "Port to listen on")
fs.IntVar(&args.port, "p", args.port, "--port")
fs.StringVar(&args.pubKey, "public-key", args.pubKey, "Woodpecker public key for verification")
fs.StringVar(&args.pubKey, "k", args.pubKey, "--public-key")
fs.StringVar(&args.pubKeyFile, "public-key-file", args.pubKeyFile, "Path to file containing woodpecker public key for verification")
fs.StringVar(&args.pubKeyFile, "K", args.pubKeyFile, "--public-key-file")
logLevelFunc := func(s string) error {
switch strings.ToLower(s) {
case "debug":
args.logLevel = slog.LevelDebug
case "info":
args.logLevel = slog.LevelInfo
case "warn", "warning":
args.logLevel = slog.LevelWarn
case "error":
args.logLevel = slog.LevelError
default:
return fmt.Errorf("unknown log level %q: [debug, info, warn, error]", s)
}
return nil
}
fs.Func("log-level", "Log level", logLevelFunc)
fs.Func("l", "--log-level", logLevelFunc)
fs.BoolVar(&args.logJSON, "json", args.logJSON, "JSON logging")
fs.BoolVar(&args.logJSON, "j", args.logJSON, "--json")
if err := ff.Parse(fs, os.Args[1:],
ff.WithConfigFileFlag("config"),
ff.WithAllowMissingConfigFile(true),
ff.WithConfigFileParser(ffyaml.Parser),
ff.WithEnvVarPrefix("JSONNETPECKER"),
); err != nil {
return err
}
if args.pubKeyFile != "" {
data, err := os.ReadFile(args.pubKeyFile)
if err != nil {
return err
}
args.pubKey = string(bytes.TrimSpace(data))
}
pubKey, err := publicKey(args.pubKey)
if err != nil {
return err
}
addr := fmt.Sprintf(":%d", args.port)
fmt.Printf("Listening at http://localhost%s\n", addr)
return http.ListenAndServe(addr, mux(pubKey))
}
func mux(pubKey ed25519.PublicKey) http.Handler {
mux := chi.NewMux()
mux.Use(middleware.Logger)
mux.Use(middleware.Recoverer)
mux.Get("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`send me some jsonnet`))
})
mux.With(verifyMiddleware(pubKey)).Post("/", func(w http.ResponseWriter, r *http.Request) {
var req Request
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(map[string]string{"error": "could not decode JSON"})
return
}
configs := make([]Config, 0, len(req.Configs))
for _, cfg := range req.Configs {
if strings.HasSuffix(cfg.Name, "jsonnet") {
vm := jsonnet.MakeVM()
jsonData, err := vm.EvaluateAnonymousSnippet(cfg.Name, cfg.Data)
if err != nil {
slog.Error("could not evaluate jsonnet", slog.Any("err", err))
continue
}
var data map[string]any
if err := json.Unmarshal([]byte(jsonData), &data); err != nil {
slog.Error("could not unmarshal jsonnet into intermediary map", slog.Any("err", err))
continue
}
yamlData, err := yaml.Marshal(data)
if err != nil {
slog.Error("could not marshal YAML", slog.Any("err", err))
continue
}
cfg.Data = string(yamlData)
}
configs = append(configs, cfg)
}
json.NewEncoder(w).Encode(Request{Configs: configs})
})
return mux
}
func publicKey(raw string) (ed25519.PublicKey, error) {
pemblock, _ := pem.Decode([]byte(raw))
if pemblock == nil {
return nil, errors.New("failed to decode PEM block")
}
b, err := x509.ParsePKIXPublicKey(pemblock.Bytes)
if err != nil {
return nil, fmt.Errorf("Failed to parse public key file: %w", err)
}
pubKey, ok := b.(ed25519.PublicKey)
if !ok {
return nil, errors.New("Failed to parse public key file")
}
return pubKey, nil
}
func verify(pubKey ed25519.PublicKey, r *http.Request) error {
verifier, err := httpsign.NewEd25519Verifier(pubKey, httpsign.NewVerifyConfig(), httpsign.Headers("@request-target", "content-digest"))
if err != nil {
return fmt.Errorf("could not create new http signing verifier: %w", err)
}
err = httpsign.VerifyRequest(magicKey, *verifier, r)
if err != nil {
return fmt.Errorf("could not verify request: %w", err)
}
return nil
}
func verifyMiddleware(pubKey ed25519.PublicKey) func(http.Handler) http.Handler {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if err := verify(pubKey, r); err != nil {
w.WriteHeader(http.StatusUnauthorized)
json.NewEncoder(w).Encode(map[string]string{"error": "Failed to verify request"})
return
}
next.ServeHTTP(w, r)
})
}
}
type Request struct {
Configs []Config `json:"configs"`
}
type Config struct {
Name string `json:"name"`
Data string `json:"data"`
}
func main() {
if err := maine(); err != nil {
panic(err)
}
}
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