Import export (#194)

* start with export/import code

* messing about with decoding/encoding

* some more fiddling

* stuff is WORKING

* working pretty alright!

* go fmt

* fix up tests, add docs

* start backup/restore doc

* tweaks

* credits

* update advancedVisibility settings

* update bun library -> v1.0.4

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* update oauth library -> v4.3.1-SSB

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* handle oauth token scope, fix user.SigninCount + token.UserID

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* update oauth library --> v4.3.2-SSB

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* update sqlite library -> v1.13.0

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

* review changes

* start with export/import code

* messing about with decoding/encoding

* some more fiddling

* stuff is WORKING

* working pretty alright!

* go fmt

* fix up tests, add docs

* start backup/restore doc

* tweaks

* credits

* update advancedVisibility settings

* review changes

Co-authored-by: kim (grufwub) <grufwub@gmail.com>
Co-authored-by: kim <89579420+NyaaaWhatsUpDoc@users.noreply.github.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/internal/trans/encoders.go b/internal/trans/encoders.go
new file mode 100644
index 000000000..76c2acadc
--- /dev/null
+++ b/internal/trans/encoders.go
@@ -0,0 +1,83 @@
+/*
+   GoToSocial
+   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Affero General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package trans
+
+import (
+	"context"
+	"crypto/x509"
+	"encoding/json"
+	"encoding/pem"
+	"errors"
+	"fmt"
+	"os"
+
+	transmodel "github.com/superseriousbusiness/gotosocial/internal/trans/model"
+)
+
+// accountEncode handles special fields like private + public keys on accounts
+func (e *exporter) accountEncode(ctx context.Context, f *os.File, a *transmodel.Account) error {
+	a.Type = transmodel.TransAccount
+
+	// marshal public key
+	encodedPublicKey := x509.MarshalPKCS1PublicKey(a.PublicKey)
+	if encodedPublicKey == nil {
+		return errors.New("could not MarshalPKCS1PublicKey")
+	}
+	publicKeyBytes := pem.EncodeToMemory(&pem.Block{
+		Type:  "RSA PUBLIC KEY",
+		Bytes: encodedPublicKey,
+	})
+	a.PublicKeyString = string(publicKeyBytes)
+
+	if a.Domain == "" {
+		// marshal private key for local account
+		encodedPrivateKey := x509.MarshalPKCS1PrivateKey(a.PrivateKey)
+		if encodedPrivateKey == nil {
+			return errors.New("could not MarshalPKCS1PrivateKey")
+		}
+		privateKeyBytes := pem.EncodeToMemory(&pem.Block{
+			Type:  "RSA PRIVATE KEY",
+			Bytes: encodedPrivateKey,
+		})
+		a.PrivateKeyString = string(privateKeyBytes)
+	}
+
+	return e.simpleEncode(ctx, f, a, a.ID)
+}
+
+// simpleEncode can be used for any type that doesn't have special keys which need handling differently,
+// or for types where special keys have already been handled.
+//
+// Beware, the 'type' key on the passed interface should already have been set, since simpleEncode won't know
+// what type it is! If you try to decode stuff you've encoded with a missing type key, you're going to have a bad time.
+func (e *exporter) simpleEncode(ctx context.Context, file *os.File, i interface{}, id string) error {
+	_, alreadyWritten := e.writtenIDs[id]
+	if alreadyWritten {
+		// this exporter has already exported an entry with this ID, no need to do it twice
+		return nil
+	}
+
+	err := json.NewEncoder(file).Encode(i)
+	if err != nil {
+		return fmt.Errorf("simpleEncode: error encoding entry with id %s: %s", id, err)
+	}
+
+	e.writtenIDs[id] = true
+	return nil
+}