refactor: refactor pgp implementation

This commit refactors the internal PGP implementation to make way for
GPG integration.

Signed-off-by: Tim Culverhouse <tim@timculverhouse.com>
Acked-by: Koni Marti <koni.marti@gmail.com>
Acked-by: Robin Jarry <robin@jarry.cc>

5 files changed, 27 insertions, 72 deletions

diff --git a/widgets/aerc.go b/widgets/aerc.go
index 717547dc..0b4e36dd 100644
--- a/widgets/aerc.go
+++ b/widgets/aerc.go
@@ -16,6 +16,7 @@ import (
 
 	"git.sr.ht/~rjarry/aerc/config"
 	"git.sr.ht/~rjarry/aerc/lib"
+	"git.sr.ht/~rjarry/aerc/lib/crypto"
 	"git.sr.ht/~rjarry/aerc/lib/ui"
 	"git.sr.ht/~rjarry/aerc/models"
 )
@@ -38,6 +39,8 @@ type Aerc struct {
 	ui          *ui.UI
 	beep        func() error
 	dialog      ui.DrawableInteractive
+
+	Crypto crypto.Provider
 }
 
 type Choice struct {
@@ -47,9 +50,9 @@ type Choice struct {
 }
 
 func NewAerc(conf *config.AercConfig, logger *log.Logger,
-	cmd func(cmd []string) error, complete func(cmd string) []string,
-	cmdHistory lib.History, deferLoop chan struct{},
-) *Aerc {
+	crypto crypto.Provider, cmd func(cmd []string) error,
+	complete func(cmd string) []string, cmdHistory lib.History,
+	deferLoop chan struct{}) *Aerc {
 	tabs := ui.NewTabs(&conf.Ui)
 
 	statusbar := ui.NewStack(conf.Ui)
@@ -79,6 +82,7 @@ func NewAerc(conf *config.AercConfig, logger *log.Logger,
 		statusline: statusline,
 		prompts:    ui.NewStack(conf.Ui),
 		tabs:       tabs,
+		Crypto:     crypto,
 	}
 
 	statusline.SetAerc(aerc)
diff --git a/widgets/compose.go b/widgets/compose.go
index 5f2c7069..6298be3a 100644
--- a/widgets/compose.go
+++ b/widgets/compose.go
@@ -15,9 +15,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/ProtonMail/go-crypto/openpgp"
 	"github.com/emersion/go-message/mail"
-	"github.com/emersion/go-pgpmail"
 	"github.com/gdamore/tcell/v2"
 	"github.com/mattn/go-runewidth"
 	"github.com/mitchellh/go-homedir"
@@ -25,7 +23,6 @@ import (
 
 	"git.sr.ht/~rjarry/aerc/completer"
 	"git.sr.ht/~rjarry/aerc/config"
-	"git.sr.ht/~rjarry/aerc/lib"
 	"git.sr.ht/~rjarry/aerc/lib/format"
 	"git.sr.ht/~rjarry/aerc/lib/templates"
 	"git.sr.ht/~rjarry/aerc/lib/ui"
@@ -455,38 +452,27 @@ func (c *Composer) WriteMessage(header *mail.Header, writer io.Writer) error {
 		var cleartext io.WriteCloser
 		var err error
 
-		var signer *openpgp.Entity
+		var signerEmail string
 		if c.sign {
-			signer, err = getSigner(c)
+			signerEmail, err = getSenderEmail(c)
 			if err != nil {
 				return err
 			}
 		} else {
-			signer = nil
+			signerEmail = ""
 		}
 
 		if c.encrypt {
-			var to []*openpgp.Entity
 			rcpts, err := getRecipientsEmail(c)
 			if err != nil {
 				return err
 			}
-			for _, rcpt := range rcpts {
-				toEntity, err := lib.GetEntityByEmail(rcpt)
-				if err != nil {
-					return errors.Wrap(err, "no key for "+rcpt)
-				}
-				to = append(to, toEntity)
-			}
-			cleartext, err = pgpmail.Encrypt(&buf, header.Header.Header,
-				to, signer, nil)
-
+			cleartext, err = c.aerc.Crypto.Encrypt(&buf, rcpts, signerEmail, c.aerc.DecryptKeys, header)
 			if err != nil {
 				return err
 			}
 		} else {
-			cleartext, err = pgpmail.Sign(&buf, header.Header.Header,
-				signer, nil)
+			cleartext, err = c.aerc.Crypto.Sign(&buf, signerEmail, c.aerc.DecryptKeys, header)
 			if err != nil {
 				return err
 			}
@@ -1031,30 +1017,3 @@ func (rm *reviewMessage) OnInvalidate(fn func(ui.Drawable)) {
 func (rm *reviewMessage) Draw(ctx *ui.Context) {
 	rm.grid.Draw(ctx)
 }
-
-func getSigner(c *Composer) (signer *openpgp.Entity, err error) {
-	signerEmail, err := getSenderEmail(c)
-	if err != nil {
-		return nil, err
-	}
-	signer, err = lib.GetSignerEntityByEmail(signerEmail)
-	if err != nil {
-		return nil, err
-	}
-
-	key, ok := signer.SigningKey(time.Now())
-	if !ok {
-		return nil, fmt.Errorf("no signing key found for %s", signerEmail)
-	}
-
-	if !key.PrivateKey.Encrypted {
-		return signer, nil
-	}
-
-	_, err = c.aerc.DecryptKeys([]openpgp.Key{key}, false)
-	if err != nil {
-		return nil, err
-	}
-
-	return signer, nil
-}
diff --git a/widgets/msglist.go b/widgets/msglist.go
index 5eee7ed4..df24526a 100644
--- a/widgets/msglist.go
+++ b/widgets/msglist.go
@@ -295,7 +295,8 @@ func (ml *MessageList) MouseEvent(localX int, localY int, event tcell.Event) {
 				if msg == nil {
 					return
 				}
-				lib.NewMessageStoreView(msg, store, ml.aerc.DecryptKeys,
+				lib.NewMessageStoreView(msg, store, ml.aerc.Crypto,
+					ml.aerc.DecryptKeys,
 					func(view lib.MessageView, err error) {
 						if err != nil {
 							ml.aerc.PushError(err.Error())
diff --git a/widgets/msgviewer.go b/widgets/msgviewer.go
index 89cbc2cc..c88c9817 100644
--- a/widgets/msgviewer.go
+++ b/widgets/msgviewer.go
@@ -75,9 +75,9 @@ func NewMessageViewer(acct *AccountView,
 		{Strategy: ui.SIZE_EXACT, Size: ui.Const(headerHeight)},
 	}
 
-	if msg.PGPDetails() != nil {
+	if msg.MessageDetails() != nil {
 		height := 1
-		if msg.PGPDetails().IsSigned && msg.PGPDetails().IsEncrypted {
+		if msg.MessageDetails().IsSigned && msg.MessageDetails().IsEncrypted {
 			height = 2
 		}
 		rows = append(rows, ui.GridSpec{Strategy: ui.SIZE_EXACT, Size: ui.Const(height)})
@@ -107,8 +107,8 @@ func NewMessageViewer(acct *AccountView,
 	borderChar := acct.UiConfig().BorderCharHorizontal
 
 	grid.AddChild(header).At(0, 0)
-	if msg.PGPDetails() != nil {
-		grid.AddChild(NewPGPInfo(msg.PGPDetails(), acct.UiConfig())).At(1, 0)
+	if msg.MessageDetails() != nil {
+		grid.AddChild(NewPGPInfo(msg.MessageDetails(), acct.UiConfig())).At(1, 0)
 		grid.AddChild(ui.NewFill(borderChar, borderStyle)).At(2, 0)
 		grid.AddChild(switcher).At(3, 0)
 	} else {
diff --git a/widgets/pgpinfo.go b/widgets/pgpinfo.go
index 6c07ed91..8dc05707 100644
--- a/widgets/pgpinfo.go
+++ b/widgets/pgpinfo.go
@@ -1,22 +1,18 @@
 package widgets
 
 import (
-	"errors"
-
 	"git.sr.ht/~rjarry/aerc/config"
 	"git.sr.ht/~rjarry/aerc/lib/ui"
-
-	"github.com/ProtonMail/go-crypto/openpgp"
-	pgperrors "github.com/ProtonMail/go-crypto/openpgp/errors"
+	"git.sr.ht/~rjarry/aerc/models"
 )
 
 type PGPInfo struct {
 	ui.Invalidatable
-	details  *openpgp.MessageDetails
+	details  *models.MessageDetails
 	uiConfig config.UIConfig
 }
 
-func NewPGPInfo(details *openpgp.MessageDetails, uiConfig config.UIConfig) *PGPInfo {
+func NewPGPInfo(details *models.MessageDetails, uiConfig config.UIConfig) *PGPInfo {
 	return &PGPInfo{details: details, uiConfig: uiConfig}
 }
 
@@ -27,38 +23,33 @@ func (p *PGPInfo) DrawSignature(ctx *ui.Context) {
 	defaultStyle := p.uiConfig.GetStyle(config.STYLE_DEFAULT)
 
 	// TODO: Nicer prompt for TOFU, fetch from keyserver, etc
-	if errors.Is(p.details.SignatureError, pgperrors.ErrUnknownIssuer) ||
-		p.details.SignedBy == nil {
+	if p.details.SignatureValidity == models.UnknownEntity ||
+		p.details.SignedBy == "" {
 
 		x := ctx.Printf(0, 0, warningStyle, "*")
 		x += ctx.Printf(x, 0, defaultStyle,
 			" Signed with unknown key (%8X); authenticity unknown",
 			p.details.SignedByKeyId)
-	} else if p.details.SignatureError != nil {
+	} else if p.details.SignatureValidity != models.Valid {
 		x := ctx.Printf(0, 0, errorStyle, "Invalid signature!")
 		x += ctx.Printf(x, 0, errorStyle,
 			" This message may have been tampered with! (%s)",
-			p.details.SignatureError.Error())
+			p.details.SignatureError)
 	} else {
-		entity := p.details.SignedBy.Entity
-		ident := entity.PrimaryIdentity()
-
 		x := ctx.Printf(0, 0, validStyle, "✓ Authentic ")
 		x += ctx.Printf(x, 0, defaultStyle,
 			"Signature from %s (%8X)",
-			ident.Name, p.details.SignedByKeyId)
+			p.details.SignedBy, p.details.SignedByKeyId)
 	}
 }
 
 func (p *PGPInfo) DrawEncryption(ctx *ui.Context, y int) {
 	validStyle := p.uiConfig.GetStyle(config.STYLE_SUCCESS)
 	defaultStyle := p.uiConfig.GetStyle(config.STYLE_DEFAULT)
-	entity := p.details.DecryptedWith.Entity
-	ident := entity.PrimaryIdentity()
 
 	x := ctx.Printf(0, y, validStyle, "✓ Encrypted ")
 	x += ctx.Printf(x, y, defaultStyle,
-		"To %s (%8X) ", ident.Name, p.details.DecryptedWith.PublicKey.KeyId)
+		"To %s (%8X) ", p.details.DecryptedWith, p.details.DecryptedWithKeyId)
 }
 
 func (p *PGPInfo) Draw(ctx *ui.Context) {