Merge pull request #2 from domsolutions/use-generics

Use generics and fix bug of jwt count

.gitignore

@@ -5,3 +5,6 @@ server_*
 *.qlog
 gopayloader.exe
 gopayloader.zip
+gopayloader-darwin-amd64
+gopayloader-linux-amd64
+gopayloader-windows-amd64.exe

build-release.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+GOOS=windows go build -o gopayloader-windows-amd64.exe ./
+GOOS=linux go build -o gopayloader-linux-amd64 ./
+GOOS=darwin go build -o gopayloader-darwin-amd64 ./

pkgs/jwt-generator/cache.go

@@ -22,12 +22,12 @@ func newCache(f *os.File) (*cache, error) {
 	c.scanner = bufio.NewScanner(c.f)
 	c.scanner.Split(bufio.ScanLines)
 	if c.scanner.Scan() {
-		meta := c.scanner.Bytes()
-		if len(meta) < 8 {
-			return nil, fmt.Errorf("jwt_generator: corrupt jwt cache, wanted 8 bytes got %d", len(meta))
+		bb := make([]byte, 8)
+		_, err := f.ReadAt(bb, 0)
+		if err != nil {
+			return nil, err
 		}
-		c.count = int64(binary.LittleEndian.Uint64(meta[0:8]))
-
+		c.count = int64(binary.LittleEndian.Uint64(bb))
 		return &c, nil
 	}
 	return &c, nil
@@ -115,11 +115,13 @@ func (c *cache) save(tokens []string) error {
 	}
 
 	b := make([]byte, 8)
-	binary.LittleEndian.PutUint64(b, uint64(int64(add)+c.count))
+	newCount := uint64(int64(add) + c.count)
+	binary.LittleEndian.PutUint64(b, newCount)
 	_, err = c.f.WriteAt(b, 0)
 	if err != nil {
 		return err
 	}
+
 	_, err = c.f.WriteAt([]byte{byte('\n')}, 9)
 	if err != nil {
 		return err

pkgs/jwt-generator/jwt.go

@@ -81,7 +81,7 @@ func (j *JWTGenerator) Generate(reqJwtCount int64, dir string, retrying bool) er
 			return err
 		}
 		f.Close()
-		pterm.Error.Printf("jwt cache %s file corrupt, attempting to delete and recreate", fname)
+		pterm.Debug.Printf("jwt cache %s file corrupt, attempting to delete and recreate; got error; %v \n", fname, err)
 		if err := os.Remove(fname); err != nil {
 			pterm.Error.Printf("Couldn't remove cache file %s; %v", fname, err)
 			return err

pkgs/jwt-signer/signer.go

@@ -1,30 +1,105 @@
 package jwt_signer
 
 import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/rsa"
 	"errors"
 	"github.com/domsolutions/gopayloader/pkgs/jwt-signer/definition"
-	"github.com/domsolutions/gopayloader/pkgs/jwt-signer/ecdsa"
-	ed25519 "github.com/domsolutions/gopayloader/pkgs/jwt-signer/ed25519"
-	"github.com/domsolutions/gopayloader/pkgs/jwt-signer/rsa256"
-	rsa512 "github.com/domsolutions/gopayloader/pkgs/jwt-signer/rsa512"
+	"github.com/golang-jwt/jwt"
+	"github.com/pterm/pterm"
 )
 
-type Signer func(privKey []byte, kid string) (definition.Signer, error)
+func CreateSigner(privKey []byte, kid string) (definition.Signer, error) {
+	var signer definition.Signer
 
-// TODO add more signers, use generics?
+	signer, err := createSigner[*ecdsa.PrivateKey](privKey, kid, jwt.ParseECPrivateKeyFromPEM, jwt.SigningMethodES256)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[*ecdsa.PrivateKey](privKey, kid, jwt.ParseECPrivateKeyFromPEM, jwt.SigningMethodES384)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[*ecdsa.PrivateKey](privKey, kid, jwt.ParseECPrivateKeyFromPEM, jwt.SigningMethodES512)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[crypto.PrivateKey](privKey, kid, jwt.ParseEdPrivateKeyFromPEM, jwt.SigningMethodEdDSA)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[*rsa.PrivateKey](privKey, kid, jwt.ParseRSAPrivateKeyFromPEM, jwt.SigningMethodRS512)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[*rsa.PrivateKey](privKey, kid, jwt.ParseRSAPrivateKeyFromPEM, jwt.SigningMethodRS256)
+	if err == nil {
+		return signer, nil
+	}
+	signer, err = createSigner[*rsa.PrivateKey](privKey, kid, jwt.ParseRSAPrivateKeyFromPEM, jwt.SigningMethodRS384)
+	if err == nil {
+		return signer, nil
+	}
 
-var signers = []Signer{ecdsa.Signer, ed25519.Signer, rsa256.Signer, rsa512.Signer}
+	signer, err = createSigner[[]byte](privKey, kid, func(key []byte) ([]byte, error) {
+		return key, nil
+	}, jwt.SigningMethodHS256)
+	if err == nil {
+		return signer, nil
+	}
 
-func CreateSigner(privKey []byte, kid string) (definition.Signer, error) {
-	var signer definition.Signer
-	var err error
-	for _, s := range signers {
-		signer, err = s(privKey, kid)
-		if err != nil {
-			continue
-		}
+	signer, err = createSigner[[]byte](privKey, kid, func(key []byte) ([]byte, error) {
+		return key, nil
+	}, jwt.SigningMethodHS384)
+	if err == nil {
+		return signer, nil
+	}
+
+	signer, err = createSigner[[]byte](privKey, kid, func(key []byte) ([]byte, error) {
+		return key, nil
+	}, jwt.SigningMethodHS512)
+	if err == nil {
 		return signer, nil
 	}
 
 	return nil, errors.New("no supported jwt signer")
 }
+
+type signer struct {
+	kid     string
+	privKey any
+	method  jwt.SigningMethod
+}
+
+func (e *signer) Generate(claims jwt.MapClaims) (string, error) {
+	token := jwt.NewWithClaims(e.method, claims)
+	token.Header["kid"] = e.kid
+
+	t, err := token.SignedString(e.privKey)
+	if err != nil {
+		return "", err
+	}
+	return t, nil
+}
+
+func createSigner[k any](privKey []byte, kid string, genPrivKey func(key []byte) (k, error), method jwt.SigningMethod) (definition.Signer, error) {
+	key, err := genPrivKey(privKey)
+	if err != nil {
+		pterm.Debug.Printf("Failed to parse private key %v", err)
+		return nil, err
+	}
+
+	s := &signer{
+		kid:     kid,
+		privKey: key,
+		method:  method,
+	}
+	claim := make(jwt.MapClaims)
+	claim["test"] = true
+	if _, err := s.Generate(claim); err != nil {
+		pterm.Debug.Printf("Failed to generate jwt %v", err)
+		return nil, err
+	}
+	return s, nil
+}