feat: add fyne-gui-test

fyne-gui-test/go.mod

@@ -0,0 +1,42 @@
+module fyne-gui-test
+
+go 1.24.3
+
+require (
+	fyne.io/fyne/v2 v2.6.3
+)
+
+require (
+	fyne.io/systray v1.11.0 // indirect
+	github.com/BurntSushi/toml v1.4.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fredbi/uri v1.1.0 // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/fyne-io/gl-js v0.2.0 // indirect
+	github.com/fyne-io/glfw-js v0.3.0 // indirect
+	github.com/fyne-io/image v0.1.1 // indirect
+	github.com/fyne-io/oksvg v0.1.0 // indirect
+	github.com/go-gl/gl v0.0.0-20231021071112-07e5d0ea2e71 // indirect
+	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20240506104042-037f3cc74f2a // indirect
+	github.com/go-text/render v0.2.0 // indirect
+	github.com/go-text/typesetting v0.2.1 // indirect
+	github.com/godbus/dbus/v5 v5.1.0 // indirect
+	github.com/hack-pad/go-indexeddb v0.3.2 // indirect
+	github.com/hack-pad/safejs v0.1.0 // indirect
+	github.com/jeandeaual/go-locale v0.0.0-20250612000132-0ef82f21eade // indirect
+	github.com/jsummers/gobmp v0.0.0-20230614200233-a9de23ed2e25 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 // indirect
+	github.com/nicksnyder/go-i18n/v2 v2.5.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rymdport/portal v0.4.1 // indirect
+	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c // indirect
+	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
+	github.com/stretchr/testify v1.10.0 // indirect
+	github.com/yuin/goldmark v1.7.8 // indirect
+	golang.org/x/image v0.24.0 // indirect
+	golang.org/x/net v0.35.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

fyne-gui-test/go.sum

@@ -0,0 +1,133 @@
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+fyne.io/fyne v1.4.3/go.mod h1:8kiPBNSDmuplxs9WnKCkaWYqbcXFy0DeAzwa6PBO9Z8=
+fyne.io/fyne/v2 v2.6.3 h1:cvtM2KHeRuH+WhtHiA63z5wJVBkQ9+Ay0UMl9PxFHyA=
+fyne.io/fyne/v2 v2.6.3/go.mod h1:NGSurpRElVoI1G3h+ab2df3O5KLGh1CGbsMMcX0bPIs=
+fyne.io/systray v1.11.0 h1:D9HISlxSkx+jHSniMBR6fCFOUjk1x/OOOJLa9lJYAKg=
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+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200720211630-cb9d2d5c5666/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.30.0 h1:QjkSwP/36a20jFYWkSue1YwXzLmsV5Gfq7Eiy72C1uc=
+golang.org/x/sys v0.30.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.22.0 h1:bofq7m3/HAFvbF51jz3Q9wLg3jkvSPuiZu/pD1XwgtM=
+golang.org/x/text v0.22.0/go.mod h1:YRoo4H8PVmsu+E3Ou7cqLVH8oXWIHVoX0jqUWALQhfY=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190808195139-e713427fea3f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.0.0-20200328031815-3db5fc6bac03/go.mod h1:Sl4aGygMT6LrqrWclx+PTx3U+LnKx/seiNR+3G19Ar8=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

fyne-gui-test/main.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/widget"
+)
+
+func main() {
+	myApp := app.New()
+	window := myApp.NewWindow("Hello World.")
+	window.Resize(fyne.NewSize(700, 400))
+	// window.SetFixedSize(true)
+
+	textEntry := widget.NewMultiLineEntry()
+	textEntry.Wrapping = fyne.TextWrapWord
+	// textEntry.Disable()
+
+	initialText := "This is text"
+	textEntry.SetText(initialText)
+	textEntry.OnChanged = func(text string) {
+		if text != initialText {
+			textEntry.SetText(initialText)
+		}
+	}
+
+	button := widget.NewButton(" [ Close ] ", func() {
+		myApp.Quit()
+	})
+
+	content := container.NewBorder(
+		nil, // top
+		container.NewBorder(nil, nil, nil, button, nil), // bottom
+		nil,       // left
+		nil,       // right
+		textEntry, // center
+	)
+
+	window.SetContent(content)
+	window.CenterOnScreen()
+	window.ShowAndRun()
+}

go-ca/go.mod

@@ -0,0 +1,3 @@
+module git.hatter.ink/golang-tests/go-ca
+
+go 1.24.3

go-ca/main.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/sha1"
+	"crypto/x509"
+	"crypto/x509/pkix"
+	"encoding/pem"
+	"math"
+	"math/big"
+	"time"
+)
+
+func main() {
+	err := innerMain()
+	if err == nil {
+		println("Success")
+	} else {
+		println("Error: ", err.Error())
+	}
+}
+
+func innerMain() error {
+	rootKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
+	if err != nil {
+		return err
+	}
+	rootCert, err := issueRootCertificate(&rootKey.PublicKey, rootKey)
+	if err != nil {
+		return err
+	}
+	println(string(pem.EncodeToMemory(&pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: rootCert,
+	})))
+	return nil
+}
+
+func issueRootCertificate(pubKey, parentPrivKey any) ([]byte, error) {
+	now := time.Now()
+	template := x509.Certificate{
+		SerialNumber: generateSerialNumber(),
+		Subject: pkix.Name{
+			CommonName: "Root CA",
+		},
+		NotBefore:             now.UTC(),
+		NotAfter:              now.AddDate(100, 0, 0).UTC(),
+		BasicConstraintsValid: true,
+		IsCA:                  true,
+		MaxPathLen:            10,
+		// MaxPathLenZero:        true,
+		SubjectKeyId: getKeyId(pubKey),
+		KeyUsage:     x509.KeyUsageCertSign | x509.KeyUsageCRLSign,
+	}
+	parentCert := &template
+	return x509.CreateCertificate(rand.Reader, &template, parentCert, pubKey, parentPrivKey)
+}
+
+func getKeyId(pubKey any) []byte {
+	pubKeyBytes, err := x509.MarshalPKIXPublicKey(pubKey)
+	if err != nil {
+		panic("Should not happen")
+	}
+	return sha1.New().Sum(pubKeyBytes)
+}
+
+func generateSerialNumber() *big.Int {
+	randInt, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64))
+	if err != nil {
+		panic("Should not happen")
+	}
+	return randInt
+}

go-tpm-non-restricted-key/go.mod

@@ -0,0 +1,8 @@
+module git.hatter.ink/go-tpm-non-restricted-key
+
+go 1.24.3
+
+require (
+	github.com/google/go-tpm v0.9.5 // indirect
+	golang.org/x/sys v0.8.0 // indirect
+)

go-tpm-non-restricted-key/go.sum

@@ -0,0 +1,4 @@
+github.com/google/go-tpm v0.9.5 h1:ocUmnDebX54dnW+MQWGQRbdaAcJELsa6PqZhJ48KwVU=
+github.com/google/go-tpm v0.9.5/go.mod h1:h9jEsEECg7gtLis0upRBQU+GhYVH6jMjrFxI8u6bVUY=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

go-tpm-non-restricted-key/main.go

@@ -0,0 +1,211 @@
+package main
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/rand"
+	"crypto/sha256"
+	"crypto/x509"
+	"encoding/asn1"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"math/big"
+	"os"
+
+	"github.com/google/go-tpm/legacy/tpm2"
+	"github.com/google/go-tpm/tpmutil"
+)
+
+func generateSrk(f *os.File) {
+	tmpl := tpm2.Public{
+		Type:    tpm2.AlgRSA,
+		NameAlg: tpm2.AlgSHA256,
+		Attributes: tpm2.FlagFixedTPM | // Key can't leave the TPM.
+			tpm2.FlagFixedParent | // Key can't change parent.
+			tpm2.FlagSensitiveDataOrigin | // Key created by the TPM (not imported).
+			tpm2.FlagUserWithAuth | // Uses (empty) password.
+			tpm2.FlagNoDA | // This flag doesn't do anything, but it's in the spec.
+			tpm2.FlagRestricted | // Key used for TPM challenges, not general decryption.
+			tpm2.FlagDecrypt, // Key can be used to decrypt data.
+		RSAParameters: &tpm2.RSAParams{
+			Symmetric:  &tpm2.SymScheme{Alg: tpm2.AlgAES, KeyBits: 128, Mode: tpm2.AlgCFB},
+			KeyBits:    2048,
+			ModulusRaw: make([]byte, 256),
+		},
+	}
+
+	srk, _, err := tpm2.CreatePrimary(f, tpm2.HandleOwner, tpm2.PCRSelection{}, "", "", tmpl)
+	if err != nil {
+		log.Fatalf("creating srk: %v", err)
+	}
+	out, err := tpm2.ContextSave(f, srk)
+	if err != nil {
+		log.Fatalf("saving context: %v", err)
+	}
+	if err := os.WriteFile("srk.ctx", out, 0644); err != nil {
+		log.Fatalf("writing context: %v", err)
+	}
+}
+
+func generateAppKey(f *os.File) {
+	srkCtx, err := os.ReadFile("srk.ctx")
+	if err != nil {
+		log.Fatalf("read srk: %v", err)
+	}
+	srk, err := tpm2.ContextLoad(f, srkCtx)
+	if err != nil {
+		log.Fatalf("load srk: %v", err)
+	}
+
+	tmpl := tpm2.Public{
+		Type:    tpm2.AlgECC,
+		NameAlg: tpm2.AlgSHA256,
+		Attributes: tpm2.FlagFixedTPM | // Key can't leave the TPM.
+			tpm2.FlagFixedParent | // Key can't change parent.
+			tpm2.FlagSensitiveDataOrigin | // Key created by the TPM (not imported).
+			tpm2.FlagUserWithAuth | // Uses (empty) password.
+			tpm2.FlagSign, // Key can be used to sign data.
+		ECCParameters: &tpm2.ECCParams{
+			Sign:    &tpm2.SigScheme{Alg: tpm2.AlgECDSA, Hash: tpm2.AlgSHA256},
+			CurveID: tpm2.CurveNISTP256,
+			Point: tpm2.ECPoint{
+				XRaw: make([]byte, 32),
+				YRaw: make([]byte, 32),
+			},
+		},
+	}
+
+	privBlob, pubBlob, _, hash, ticket, err := tpm2.CreateKey(f, srk, tpm2.PCRSelection{}, "", "", tmpl)
+	if err != nil {
+		log.Fatalf("create aik: %v", err)
+	}
+	log.Printf("privBlob: %x\n", privBlob)
+	log.Printf("pubBlob: %x\n", pubBlob)
+	log.Printf("hash: %x\n", hash)
+	log.Printf("ticket: %v %s\n", ticket.Type, ticket.Digest)
+
+	appKey, _, err := tpm2.Load(f, srk, "", pubBlob, privBlob)
+	if err != nil {
+		log.Fatalf("load app key: %v", err)
+	}
+
+	// Write key context to disk.
+	appKeyCtx, err := tpm2.ContextSave(f, appKey)
+	if err != nil {
+		log.Fatalf("saving context: %v", err)
+	}
+	if err := os.WriteFile("app.ctx", appKeyCtx, 0644); err != nil {
+		log.Fatalf("writing context: %v", err)
+	}
+}
+
+func fileExists(filename string) bool {
+	_, err := os.Stat(filename)
+	if err == nil {
+		return true
+	}
+	if errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+	panic("Should not happen")
+}
+
+type tpmSinger struct {
+	tpm io.ReadWriter
+	h   tpmutil.Handle
+	pub crypto.PublicKey
+}
+
+func (s *tpmSinger) Public() crypto.PublicKey {
+	return s.pub
+}
+
+func (s *tpmSinger) Sign(r io.Reader, digest []byte, opts crypto.SignerOpts) ([]byte, error) {
+	sig, err := tpm2.Sign(s.tpm, s.h, "", digest, nil, nil)
+	if err != nil {
+		return nil, fmt.Errorf("signing data: %v", err)
+	}
+	if sig.RSA != nil {
+		return sig.RSA.Signature, nil
+	}
+	if sig.ECC != nil {
+		return asn1.Marshal(struct {
+			R *big.Int
+			S *big.Int
+		}{sig.ECC.R, sig.ECC.S})
+	}
+	return nil, fmt.Errorf("unsupported signature type: %v", sig.Alg)
+}
+
+func newSigner(tpm io.ReadWriter, h tpmutil.Handle) (*tpmSinger, error) {
+	tpmPub, _, _, err := tpm2.ReadPublic(tpm, h)
+	if err != nil {
+		return nil, fmt.Errorf("read public blob: %v", err)
+	}
+	pub, err := tpmPub.Key()
+	if err != nil {
+		return nil, fmt.Errorf("decode public key: %v", err)
+	}
+	return &tpmSinger{tpm, h, pub}, nil
+}
+
+func getSinger(f *os.File) (*tpmSinger, error) {
+	keyCtx, err := os.ReadFile("app.ctx")
+	if err != nil {
+		log.Fatalf("read app key: %v", err)
+	}
+	key, err := tpm2.ContextLoad(f, keyCtx)
+	if err != nil {
+		log.Fatalf("load app key: %v", err)
+	}
+
+	return newSigner(f, key)
+}
+
+// reference: https://ericchiang.github.io/post/tpm-keys/
+func main() {
+	f, err := os.OpenFile("/dev/tpmrm0", os.O_RDWR, 0)
+	if err != nil {
+		log.Fatalf("opening tpm: %v", err)
+	}
+	defer f.Close()
+
+	if !fileExists("srk.ctx") {
+		generateSrk(f)
+	}
+	if !fileExists("app.ctx") {
+		generateAppKey(f)
+	}
+
+	priv, err := getSinger(f)
+	if err != nil {
+		log.Fatalf("create signer: %v", err)
+	}
+
+	publicKeyDer, err := x509.MarshalPKIXPublicKey(priv.Public())
+	if err != nil {
+		log.Fatalf("public key: %v", err)
+	} else {
+		log.Printf("public key pem: %s\n", base64.StdEncoding.EncodeToString(publicKeyDer))
+	}
+
+	msg := []byte("Hello world!")
+	digest := sha256.Sum256(msg)
+
+	sig, err := priv.Sign(rand.Reader, digest[:], crypto.SHA256)
+	if err != nil {
+		log.Fatalf("signing data: %v", err)
+	}
+	log.Printf("sig: %s\n", hex.EncodeToString(sig))
+	pub, ok := priv.Public().(*ecdsa.PublicKey)
+	if !ok {
+		log.Fatalf("expected ecdsa.PublicKey got: %T", priv.Public())
+	}
+	if !ecdsa.VerifyASN1(pub, digest[:], sig) {
+		log.Fatalf("failed to verify signature")
+	}
+}

go-tpm-rand/go.mod

@@ -0,0 +1,7 @@
+module git.hatter.ink/go-tpm-rand
+
+go 1.24.3
+
+require github.com/google/go-tpm v0.9.5
+
+require golang.org/x/sys v0.8.0 // indirect

go-tpm-rand/go.sum

@@ -0,0 +1,4 @@
+github.com/google/go-tpm v0.9.5 h1:ocUmnDebX54dnW+MQWGQRbdaAcJELsa6PqZhJ48KwVU=
+github.com/google/go-tpm v0.9.5/go.mod h1:h9jEsEECg7gtLis0upRBQU+GhYVH6jMjrFxI8u6bVUY=
+golang.org/x/sys v0.8.0 h1:EBmGv8NaZBZTWvrbjNoL6HVt+IVy3QDQpJs7VRIw3tU=
+golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

go-tpm-rand/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/google/go-tpm/legacy/tpm2"
+)
+
+// reference: https://ericchiang.github.io/post/tpm-keys/
+func main() {
+	f, err := os.OpenFile("/dev/tpmrm0", os.O_RDWR, 0)
+	if err != nil {
+		log.Fatalf("opening tpm: %v", err)
+	}
+	defer f.Close()
+
+	out, err := tpm2.GetRandom(f, 16)
+	if err != nil {
+		log.Fatalf("getting random bytes: %v", err)
+	}
+	fmt.Printf("%x\n", out)
+}

okta-bcrypt-issue/go.mod

@@ -0,0 +1,5 @@
+module git.hatter.ink/okta-bcrypt-issue
+
+go 1.24.1
+
+require golang.org/x/crypto v0.40.0 // indirect

okta-bcrypt-issue/go.sum

@@ -0,0 +1,2 @@
+golang.org/x/crypto v0.40.0 h1:r4x+VvoG5Fm+eJcxMaY8CQM7Lb0l1lsmjGBQ6s8BfKM=
+golang.org/x/crypto v0.40.0/go.mod h1:Qr1vMER5WyS2dfPHAlsOj01wgLbsyWtFn/aY+5+ZdxY=

okta-bcrypt-issue/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+// https://n0rdy.foo/posts/20250121/okta-bcrypt-lessons-for-better-apis/
+func main() {
+	// 18 + 55 + 1 = 74, so above 72 characters' limit of BCrypt
+	userId := randomString(18)
+	username := randomString(55)
+	password := "super-duper-secure-password"
+
+	combinedString := fmt.Sprintf("%s:%s:%s", userId, username, password)
+
+	combinedHash, err := bcrypt.GenerateFromPassword([]byte(combinedString), bcrypt.DefaultCost)
+	if err != nil {
+		panic(err)
+	}
+
+	// let's try to break it
+	wrongPassword := "wrong-password"
+	wrongCombinedString := fmt.Sprintf("%s:%s:%s", userId, username, wrongPassword)
+
+	err = bcrypt.CompareHashAndPassword(combinedHash, []byte(wrongCombinedString))
+	if err != nil {
+		fmt.Println("Password is incorrect")
+	} else {
+		fmt.Println("Password is correct")
+	}
+}
+
+func randomString(length int) string {
+	bytes := make([]byte, length)
+	_, err := rand.Read(bytes)
+	if err != nil {
+		panic(err)
+	}
+	return base64.URLEncoding.EncodeToString(bytes)[:length]
+}

swift-from-go/Package.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "go-swift",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "go_swift",
+            type: .dynamic,
+            targets: ["go-swift"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "go-swift",
+            dependencies: []),
+        .testTarget(
+            name: "go-swiftTests",
+            dependencies: ["go-swift"]),
+    ]
+)

swift-from-go/README.md

@@ -0,0 +1,15 @@
+# go-swift
+
+> Clone from: https://github.com/onderweg/swift-from-go
+
+Example code, complementing the blog post: ["Calling Swift from Go"](https://dev.to/gerwert/calling-swift-from-go-5dbk)
+
+_Note: this repo is more than 3 years old. Feel free to use it as reference, but don't expect it to work with current versions of Go and Swift._
+
+## Building & Running
+
+```
+$ swift build
+$ go build -o hello
+$ ./hello
+```

swift-from-go/Sources/go-swift/go_swift.swift

@@ -0,0 +1,7 @@
+@_cdecl("sayHello") // export to C as `sayHello``
+public func sayHello(namePtr: UnsafePointer<CChar>?) {    
+    // Creates a new string by copying the null-terminated UTF-8 data (C String) 
+    // referenced by the given pointer.
+    let name = String(cString: namePtr!)
+    print("Welcome, \(name)!")
+}

swift-from-go/Tests/LinuxMain.swift

@@ -0,0 +1,7 @@
+import XCTest
+
+import go_swiftTests
+
+var tests = [XCTestCaseEntry]()
+tests += go_swiftTests.allTests()
+XCTMain(tests)

swift-from-go/Tests/go-swiftTests/XCTestManifests.swift

@@ -0,0 +1,9 @@
+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(go_swiftTests.allTests),
+    ]
+}
+#endif

swift-from-go/Tests/go-swiftTests/go_swiftTests.swift

@@ -0,0 +1,15 @@
+import XCTest
+@testable import go_swift
+
+final class go_swiftTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(go_swift().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

swift-from-go/include/go_swift.h

@@ -0,0 +1,2 @@
+// Manually crafted header file for C Library
+void sayHello(char* name);

swift-from-go/main.go

@@ -0,0 +1,22 @@
+package main
+
+/*
+#cgo CFLAGS: -I./include
+#cgo LDFLAGS: -L.build/debug/ -lgo_swift
+#include <stdlib.h>
+#include "include/go_swift.h"
+*/
+import "C"
+import "unsafe"
+
+func main() {
+	// Convert Go string to C string
+	cstr := C.CString("Bob")
+
+	// Call Swift function `sayHello``
+	C.sayHello(cstr)
+
+	// The C string is allocated in the C heap using malloc.
+	// Therefore memory must be freed when we're done
+	C.free(unsafe.Pointer(cstr))
+}