refactor invitation

client/invitation/files/step2.go

@@ -0,0 +1,44 @@
+package files
+
+import (
+	"errors"
+	"os"
+	"strings"
+
+	"forge.redroom.link/yves/meowlib"
+	"forge.redroom.link/yves/meowlib/client"
+	"forge.redroom.link/yves/meowlib/client/invitation/messages"
+)
+
+// Step2ReadAndAnswer reads an InvitationInitPayload from a .mwiv file, creates the
+// invitee's peer entry, and writes the invitee's ContactCard response to a .mwiv file.
+func Step2ReadAndAnswer(invitationFile string, nickname string, myNickname string, serverUids []string) error {
+	if _, err := os.Stat(invitationFile); os.IsNotExist(err) {
+		return err
+	}
+	if !strings.HasSuffix(invitationFile, ".mwiv") {
+		return errors.New("only .mwiv files are supported")
+	}
+	data, err := os.ReadFile(invitationFile)
+	if err != nil {
+		return err
+	}
+	payload, err := meowlib.NewInvitationInitPayloadFromCompressed(data)
+	if err != nil {
+		return err
+	}
+
+	mynick := myNickname
+	if mynick == "" {
+		mynick = client.GetConfig().GetIdentity().Nickname
+	}
+
+	response, err := messages.Step2InviteeCreatesInitiatorAndEncryptedContactCard(payload, nickname, mynick, serverUids)
+	if err != nil {
+		return err
+	}
+
+	c := client.GetConfig()
+	filename := c.StoragePath + string(os.PathSeparator) + mynick + "-" + nickname + ".mwiv"
+	return response.GetMyContact().WriteCompressed(filename)
+}