1 files changed, 56 insertions, 0 deletions
diff --git a/signer_test.go b/signer_test.go
new file mode 100644
index 0000000..eba0922
--- /dev/null
+++ b/signer_test.go
@@ -0,0 +1,56 @@
+package git
+
+import (
+	"encoding/base64"
+	"fmt"
+	"io"
+	"time"
+
+	"github.com/go-git/go-billy/v5/memfs"
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/go-git/go-git/v5/storage/memory"
+)
+
+type b64signer struct{}
+
+// This is not secure, and is only used as an example for testing purposes.
+// Please don't do this.
+func (b64signer) Sign(message io.Reader) ([]byte, error) {
+	b, err := io.ReadAll(message)
+	if err != nil {
+		return nil, err
+	}
+	out := make([]byte, base64.StdEncoding.EncodedLen(len(b)))
+	base64.StdEncoding.Encode(out, b)
+	return out, nil
+}
+
+func ExampleSigner() {
+	repo, err := Init(memory.NewStorage(), memfs.New())
+	if err != nil {
+		panic(err)
+	}
+	w, err := repo.Worktree()
+	if err != nil {
+		panic(err)
+	}
+	commit, err := w.Commit("example commit", &CommitOptions{
+		Author: &object.Signature{
+			Name:  "John Doe",
+			Email: "john@example.com",
+			When:  time.UnixMicro(1234567890).UTC(),
+		},
+		Signer:            b64signer{},
+		AllowEmptyCommits: true,
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	obj, err := repo.CommitObject(commit)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(obj.PGPSignature)
+	// Output: dHJlZSA0YjgyNWRjNjQyY2I2ZWI5YTA2MGU1NGJmOGQ2OTI4OGZiZWU0OTA0CmF1dGhvciBKb2huIERvZSA8am9obkBleGFtcGxlLmNvbT4gMTIzNCArMDAwMApjb21taXR0ZXIgSm9obiBEb2UgPGpvaG5AZXhhbXBsZS5jb20+IDEyMzQgKzAwMDAKCmV4YW1wbGUgY29tbWl0
+}