Add initial support for key file exporting and importing

Warning: the passphrase is currently hardcoded to "gomuks"

go.mod

@@ -23,7 +23,7 @@ require (
 	golang.org/x/net v0.0.0-20200602114024-627f9648deb9
 	gopkg.in/toast.v1 v1.0.0-20180812000517-0a84660828b2
 	gopkg.in/yaml.v2 v2.3.0
-	maunium.net/go/mautrix v0.7.1
+	maunium.net/go/mautrix v0.7.3
 	maunium.net/go/mauview v0.1.1
 	maunium.net/go/tcell v0.2.0
 )

go.sum

@@ -75,6 +75,7 @@ github.com/zyedidia/clipboard v0.0.0-20200421031010-7c45b8673834/go.mod h1:zykFn
 github.com/zyedidia/poller v1.0.1/go.mod h1:vZXJOHGDcuK08GXhF6IAY0ZFd2WcgOR5DOTp84Uk5eE=
 go.etcd.io/bbolt v1.3.4 h1:hi1bXHMVrlQh6WwxAy+qZCV/SYIlqo+Ushwdpa4tAKg=
 go.etcd.io/bbolt v1.3.4/go.mod h1:G5EMThwa9y8QZGBClrRx5EY+Yw9kAhnjy3bSjsnlVTQ=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.0.0-20200430140353-33d19683fad8 h1:6WW6V3x1P/jokJBpRQYUJnMHRP6isStQwCozxnU7XQw=
@@ -118,6 +119,8 @@ maunium.net/go/mautrix v0.7.0 h1:9Wxs5S4Wl4S99dbBwfLZYAe/sP7VKaFikw9Ocf88kfk=
 maunium.net/go/mautrix v0.7.0/go.mod h1:Va/74MijqaS0DQ3aUqxmFO54/PMfr1LVsCOcGRHbYmo=
 maunium.net/go/mautrix v0.7.1 h1:ctoAVWUPs0D1AADzuA3KLmaRONnSY61mdUoP2smNqe4=
 maunium.net/go/mautrix v0.7.1/go.mod h1:Va/74MijqaS0DQ3aUqxmFO54/PMfr1LVsCOcGRHbYmo=
+maunium.net/go/mautrix v0.7.3 h1:yC287SXL0pTZzAtpGIvwtlxPHZsWMuq2DmI5/POTKFE=
+maunium.net/go/mautrix v0.7.3/go.mod h1:Va/74MijqaS0DQ3aUqxmFO54/PMfr1LVsCOcGRHbYmo=
 maunium.net/go/mauview v0.1.1 h1:wfTXyPx3LGAGpTskh+UbBv/QItUWnEpaneHmywoYnfY=
 maunium.net/go/mauview v0.1.1/go.mod h1:3QBUiuLct9moP1LgDhCGIg0Ovxn38Bd2sGndnUOuj4o=
 maunium.net/go/tcell v0.2.0 h1:1Q0kN3wCOGAIGu1r3QHADsjSUOPDylKREvCv3EzJpVg=

ui/command-processor.go

@@ -109,6 +109,9 @@ func NewCommandProcessor(parent *MainView) *CommandProcessor {
 			"device":      autocompleteDevice,
 			"verify":      autocompleteDevice,
 			"unverify":    autocompleteDevice,
+			"import":      autocompleteFile,
+			"export":      autocompleteFile,
+			"export-room": autocompleteFile,
 		},
 		commands: map[string]CommandHandler{
 			"unknown-command": cmdUnknownCommand,
@@ -159,6 +162,9 @@ func NewCommandProcessor(parent *MainView) *CommandProcessor {
 			"unverify":      cmdUnverify,
 			"blacklist":     cmdBlacklist,
 			"reset-session": cmdResetSession,
+			"import":        cmdImportKeys,
+			"export":        cmdExportKeys,
+			"export-room":   cmdExportRoomKeys,
 		},
 	}
 }

ui/commands.go

@@ -461,6 +461,11 @@ Things: rooms, users, baremessages, images, typingnotif, unverified
 /verify <user id> <device id> [fingerprint]
     - Verify a device. If the fingerprint is not provided,
       interactive emoji verification will be started.
+/reset-session - Reset the outbound Megolm session in the current room.
+
+/import <file> - Import encryption keys
+/export <file> - Export encryption keys
+/export-room <file> - Export encryption keys for the current room.
 
 # Rooms
 /pm <user id> <...>   - Create a private chat with the given user(s).

ui/crypto-commands.go

@@ -20,6 +20,7 @@ package ui
 
 import (
 	"fmt"
+	"io/ioutil"
 	"strings"
 	"time"
 	"unicode"
@@ -229,3 +230,59 @@ func cmdResetSession(cmd *Command) {
 		cmd.Reply("Removed outbound group session for this room")
 	}
 }
+
+func autocompleteFile(cmd *CommandAutocomplete) (completions []string, newText string) {
+	// TODO implement
+	return []string{}, ""
+}
+
+// TODO add dialog for asking passphrase
+const extremelyTemporaryHardcodedPassphrase = "gomuks"
+
+func cmdImportKeys(cmd *Command) {
+	data, err := ioutil.ReadFile(cmd.RawArgs)
+	if err != nil {
+		cmd.Reply("Failed to read %s: %v", cmd.RawArgs, err)
+		return
+	}
+	mach := cmd.Matrix.Crypto().(*crypto.OlmMachine)
+	imported, total, err := mach.ImportKeys(extremelyTemporaryHardcodedPassphrase, string(data))
+	if err != nil {
+		cmd.Reply("Failed to import sessions: %v", err)
+	} else {
+		cmd.Reply("Successfully imported %d/%d sessions", imported, total)
+	}
+}
+
+func exportKeys(cmd *Command, sessions []*crypto.InboundGroupSession) {
+	export, err := crypto.ExportKeys(extremelyTemporaryHardcodedPassphrase, sessions)
+	if err != nil {
+		cmd.Reply("Failed to export sessions: %v", err)
+	}
+	err = ioutil.WriteFile(cmd.RawArgs, []byte(export), 0400)
+	if err != nil {
+		cmd.Reply("Failed to write sessions to %s: %v", cmd.RawArgs, err)
+	} else {
+		cmd.Reply("Successfully exported %d sessions to %s", len(sessions), cmd.RawArgs)
+	}
+}
+
+func cmdExportKeys(cmd *Command) {
+	mach := cmd.Matrix.Crypto().(*crypto.OlmMachine)
+	sessions, err := mach.CryptoStore.GetAllGroupSessions()
+	if err != nil {
+		cmd.Reply("Failed to get sessions to export: %v", err)
+		return
+	}
+	exportKeys(cmd, sessions)
+}
+
+func cmdExportRoomKeys(cmd *Command) {
+	mach := cmd.Matrix.Crypto().(*crypto.OlmMachine)
+	sessions, err := mach.CryptoStore.GetGroupSessionsForRoom(cmd.Room.MxRoom().ID)
+	if err != nil {
+		cmd.Reply("Failed to get sessions to export: %v", err)
+		return
+	}
+	exportKeys(cmd, sessions)
+}

ui/no-crypto-commands.go

@@ -22,6 +22,10 @@ func autocompleteDevice(cmd *CommandAutocomplete) ([]string, string) {
 	return []string{}, ""
 }
 
+func autocompleteFile(cmd *CommandAutocomplete) ([]string, string) {
+	return []string{}, ""
+}
+
 func cmdNoCrypto(cmd *Command) {
 	cmd.Reply("This gomuks was built without encryption support")
 }
@@ -33,4 +37,7 @@ var (
 	cmdUnverify = cmdNoCrypto
 	cmdBlacklist = cmdNoCrypto
 	cmdResetSession = cmdNoCrypto
+	cmdImportKeys = cmdNoCrypto
+	cmdExportKeys = cmdNoCrypto
+	cmdExportRoomKeys = cmdNoCrypto
 )