cleanup: move packages to top level, change vanity URL

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

keychain/keys.go

@@ -0,0 +1,96 @@
+package keychain
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"os/user"
+	"path"
+	"path/filepath"
+	"time"
+
+	"filippo.io/age"
+	"github.com/rs/zerolog/log"
+)
+
+func Path() (string, error) {
+	usr, err := user.Current()
+	if err != nil {
+		return "", err
+	}
+
+	return path.Join(usr.HomeDir, ".dagger", "keys.txt"), nil
+}
+
+func Default(ctx context.Context) (string, error) {
+	keys, err := List(ctx)
+	if err != nil {
+		if errors.Is(err, os.ErrNotExist) {
+			return Generate(ctx)
+		}
+		return "", err
+	}
+	if len(keys) == 0 {
+		return "", errors.New("no identities found in the keys file")
+	}
+
+	return keys[0].Recipient().String(), nil
+}
+
+func Generate(ctx context.Context) (string, error) {
+	keysFile, err := Path()
+	if err != nil {
+		return "", err
+	}
+
+	k, err := age.GenerateX25519Identity()
+	if err != nil {
+		return "", fmt.Errorf("internal error: %v", err)
+	}
+
+	if err := os.MkdirAll(filepath.Dir(keysFile), 0755); err != nil {
+		return "", err
+	}
+	f, err := os.OpenFile(keysFile, os.O_WRONLY|os.O_CREATE|os.O_EXCL, 0600)
+	if err != nil {
+		return "", fmt.Errorf("failed to open keys file %q: %v", keysFile, err)
+	}
+	defer f.Close()
+	fmt.Fprintf(f, "# created: %s\n", time.Now().Format(time.RFC3339))
+	fmt.Fprintf(f, "# public key: %s\n", k.Recipient())
+	fmt.Fprintf(f, "%s\n", k)
+
+	pubkey := k.Recipient().String()
+
+	log.Ctx(ctx).Debug().Str("publicKey", pubkey).Msg("generating keypair")
+
+	return pubkey, nil
+}
+
+func List(ctx context.Context) ([]*age.X25519Identity, error) {
+	keysFile, err := Path()
+	if err != nil {
+		return nil, err
+	}
+
+	f, err := os.Open(keysFile)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open keys file file %q: %w", keysFile, err)
+	}
+	ids, err := age.ParseIdentities(f)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse input: %w", err)
+	}
+
+	keys := make([]*age.X25519Identity, 0, len(ids))
+	for _, id := range ids {
+		key, ok := ids[0].(*age.X25519Identity)
+		if !ok {
+			return nil, fmt.Errorf("internal error: unexpected identity type: %T", id)
+		}
+		keys = append(keys, key)
+	}
+
+	return keys, nil
+}