feat: initial commit

.gitignore

@@ -0,0 +1 @@
+/bin

Dockerfile

@@ -0,0 +1,15 @@
+FROM golang:1.24 AS build
+
+COPY . /src
+
+WORKDIR /src
+
+RUN CGO_ENABLED=0 go build -o ./bin/jwk2pem .
+
+FROM busybox:latest AS runtime
+
+COPY --from=build /src/bin/jwk2pem /usr/bin/jwk2pem
+
+LABEL org.opencontainers.image.source=https://forge.cadoles.com/wpetit/jwk2pem
+
+CMD ["/usr/bin/jwk2pem"]

Makefile

@@ -0,0 +1,13 @@
+DOCKER_IMAGE_REPOSITORY ?= reg.cadoles.com/cadoles/jwk2pem
+DOCKER_IMAGE_TAG ?= latest
+
+build:
+	CGO_ENABLED=0 go build -o ./bin/jwk2pem ./ 
+
+docker-build:
+	docker build \
+		-t $(DOCKER_IMAGE_REPOSITORY):$(DOCKER_IMAGE_TAG) \
+		.
+
+docker-release: docker-build
+	docker push $(DOCKER_IMAGE_REPOSITORY):$(DOCKER_IMAGE_TAG)

README.md

@@ -0,0 +1,11 @@
+# `jwk2pem`
+
+Un simple outil en ligne de commande permettant de transformer une clé publique au format [JWK](https://www.rfc-editor.org/rfc/rfc7517) en sa représentation au format [PEM](https://fr.wikipedia.org/wiki/Demande_de_signature_de_certificat).
+
+## Usage
+
+```bash
+echo <jwk> | jwk2pem > mykey.pem
+```
+
+Une image Docker est également disponible `reg.cadoles.com/cadoles/jwk2pem`.

go.mod

@@ -0,0 +1,18 @@
+module forge.cadoles.com/wpetit/jwk2pem
+
+go 1.24.6
+
+require github.com/lestrrat-go/jwx/v2 v2.1.6
+
+require (
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 // indirect
+	github.com/goccy/go-json v0.10.3 // indirect
+	github.com/lestrrat-go/blackmagic v1.0.3 // indirect
+	github.com/lestrrat-go/httpcc v1.0.1 // indirect
+	github.com/lestrrat-go/httprc v1.0.6 // indirect
+	github.com/lestrrat-go/iter v1.0.2 // indirect
+	github.com/lestrrat-go/option v1.0.1 // indirect
+	github.com/segmentio/asm v1.2.0 // indirect
+	golang.org/x/crypto v0.32.0 // indirect
+	golang.org/x/sys v0.31.0 // indirect
+)

go.sum

@@ -0,0 +1,36 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0 h1:NMZiJj8QnKe1LgsbDayM4UoHwbvwDRwnI3hwNaAHRnc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.4.0/go.mod h1:ZXNYxsqcloTdSy/rNShjYzMhyjf0LaoftYK0p+A3h40=
+github.com/goccy/go-json v0.10.3 h1:KZ5WoDbxAIgm2HNbYckL0se1fHD6rz5j4ywS6ebzDqA=
+github.com/goccy/go-json v0.10.3/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
+github.com/lestrrat-go/blackmagic v1.0.3 h1:94HXkVLxkZO9vJI/w2u1T0DAoprShFd13xtnSINtDWs=
+github.com/lestrrat-go/blackmagic v1.0.3/go.mod h1:6AWFyKNNj0zEXQYfTMPfZrAXUWUfTIZ5ECEUEJaijtw=
+github.com/lestrrat-go/httpcc v1.0.1 h1:ydWCStUeJLkpYyjLDHihupbn2tYmZ7m22BGkcvZZrIE=
+github.com/lestrrat-go/httpcc v1.0.1/go.mod h1:qiltp3Mt56+55GPVCbTdM9MlqhvzyuL6W/NMDA8vA5E=
+github.com/lestrrat-go/httprc v1.0.6 h1:qgmgIRhpvBqexMJjA/PmwSvhNk679oqD1RbovdCGW8k=
+github.com/lestrrat-go/httprc v1.0.6/go.mod h1:mwwz3JMTPBjHUkkDv/IGJ39aALInZLrhBp0X7KGUZlo=
+github.com/lestrrat-go/iter v1.0.2 h1:gMXo1q4c2pHmC3dn8LzRhJfP1ceCbgSiT9lUydIzltI=
+github.com/lestrrat-go/iter v1.0.2/go.mod h1:Momfcq3AnRlRjI5b5O8/G5/BvpzrhoFTZcn06fEOPt4=
+github.com/lestrrat-go/jwx/v2 v2.1.6 h1:hxM1gfDILk/l5ylers6BX/Eq1m/pnxe9NBwW6lVfecA=
+github.com/lestrrat-go/jwx/v2 v2.1.6/go.mod h1:Y722kU5r/8mV7fYDifjug0r8FK8mZdw0K0GpJw/l8pU=
+github.com/lestrrat-go/option v1.0.1 h1:oAzP2fvZGQKWkvHa1/SAcFolBEca1oN+mQ7eooNBEYU=
+github.com/lestrrat-go/option v1.0.1/go.mod h1:5ZHFbivi4xwXxhxY9XHDe2FHo6/Z7WWmtT7T5nBBp3I=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/segmentio/asm v1.2.0 h1:9BQrFxC+YOHJlTlHGkTrFWf59nbL3XnCoFLTwDCI7ys=
+github.com/segmentio/asm v1.2.0/go.mod h1:BqMnlJP91P8d+4ibuonYZw9mfnzI9HfxselHZr5aAcs=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/crypto v0.32.0 h1:euUpcYgM8WcP71gNpTqQCn6rC2t6ULUPiOzfWaXVVfc=
+golang.org/x/crypto v0.32.0/go.mod h1:ZnnJkOaASj8g0AjIduWNlq2NRxL0PlBrbKVyZ6V/Ugc=
+golang.org/x/sys v0.31.0 h1:ioabZlmFYtWhL+TRYpcnNlLwhyxaM9kWTDEmfnprqik=
+golang.org/x/sys v0.31.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"encoding/pem"
+	"fmt"
+	"io"
+	"log"
+	"os"
+
+	"github.com/lestrrat-go/jwx/v2/jwk"
+)
+
+func main() {
+	// Read the JWK from standard input.
+	jwkBytes, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatalf("failed to read from stdin: %s", err)
+	}
+
+	// Parse the JWK.
+	key, err := jwk.ParseKey(jwkBytes)
+	if err != nil {
+		log.Fatalf("failed to parse JWK: %s", err)
+	}
+
+	// Get the public key.
+	var rawPublicKey interface{}
+	if err := key.Raw(&rawPublicKey); err != nil {
+		log.Fatalf("failed to get raw public key: %s", err)
+	}
+
+	// Encode the public key to PEM format. [4]
+	pemBytes, err := jwk.EncodePEM(key)
+	if err != nil {
+		log.Fatalf("failed to encode public key to PEM: %s", err)
+	}
+
+	// Write the PEM encoded public key to standard output.
+	block, _ := pem.Decode(pemBytes)
+	if block == nil {
+		log.Fatal("failed to decode PEM block")
+	}
+
+	if err := pem.Encode(os.Stdout, block); err != nil {
+		log.Fatalf("failed to write PEM block to stdout: %s", err)
+	}
+
+	fmt.Println()
+}