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main.go
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main.go
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package main
import (
"bytes"
"context"
"crypto/x509"
"encoding/json"
"encoding/pem"
"log/slog"
"os"
"strconv"
"strings"
"github.com/MicahParks/jwkset"
)
const (
logErr = "error"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
l := slog.New(slog.NewTextHandler(os.Stderr, nil))
allPEM := os.Getenv("PEM")
if allPEM == "" {
s := strings.Builder{}
if len(os.Args) < 2 {
l.Error("Please provide a list of PEM encoded files as CLI arguments or set the PEM environment variable.")
os.Exit(1)
}
for _, fileName := range os.Args[1:] {
b, err := os.ReadFile(fileName)
if err != nil {
l.Error("Failed to read file.",
"fileName", fileName,
)
os.Exit(1)
}
s.Write(bytes.TrimSpace(b))
s.WriteRune('\n')
}
allPEM = s.String()
}
jwks := jwkset.NewMemoryStorage()
i := 0
const kidPrefix = "UniqueKeyID"
allPEMB := []byte(allPEM)
for {
metadata := jwkset.JWKMetadataOptions{}
i++
block, rest := pem.Decode(allPEMB)
if block == nil {
break
}
allPEMB = rest
switch block.Type {
case "CERTIFICATE":
cert, err := jwkset.LoadCertificate(block.Bytes)
if err != nil {
l.Error("Failed to load certificates.",
logErr, err,
)
os.Exit(1)
}
metadata.KID = kidPrefix + strconv.Itoa(i)
x509Options := jwkset.JWKX509Options{
X5C: []*x509.Certificate{cert},
}
options := jwkset.JWKOptions{
Metadata: metadata,
X509: x509Options,
}
jwk, err := jwkset.NewJWKFromX5C(options)
if err != nil {
l.Error("Failed to create JWK from X5C.",
logErr, err,
)
os.Exit(1)
}
err = jwks.KeyWrite(ctx, jwk)
if err != nil {
l.Error("Failed to write JWK.",
logErr, err,
)
os.Exit(1)
}
default:
key, err := jwkset.LoadX509KeyInfer(block)
if err != nil {
l.Error("Failed to load X509 key.",
logErr, err,
)
os.Exit(1)
}
metadata.KID = kidPrefix + strconv.Itoa(i)
marshalOptions := jwkset.JWKMarshalOptions{
Private: true,
}
options := jwkset.JWKOptions{
Marshal: marshalOptions,
Metadata: metadata,
}
jwk, err := jwkset.NewJWKFromKey(key, options)
if err != nil {
l.Error("Failed to create JWK from key.",
logErr, err,
)
os.Exit(1)
}
err = jwks.KeyWrite(ctx, jwk)
if err != nil {
l.Error("Failed to write JWK.",
logErr, err,
)
os.Exit(1)
}
}
}
marshal, err := jwks.Marshal(ctx)
if err != nil {
l.Error("Failed to marshal JWK set.",
logErr, err,
)
os.Exit(1)
}
b, err := json.MarshalIndent(marshal, "", " ")
if err != nil {
l.Error("Failed to marshal JSON.",
logErr, err,
)
os.Exit(1)
}
_, _ = os.Stdout.Write(b)
}