Factor IMAP-specific structs out of UI models

Before, we were using several IMAP-specific concepts to represent
information being displayed in the UI. Factor these structures out of
the IMAP package to make it easier for other backends to provide the
required information.

1 files changed, 84 insertions, 4 deletions

diff --git a/models/models.go b/models/models.go
index cff05b1..28d256c 100644
--- a/models/models.go
+++ b/models/models.go
@@ -1,13 +1,37 @@
 package models
 
 import (
+	"bytes"
+	"fmt"
 	"io"
+	"regexp"
+	"strings"
 	"time"
 
-	"github.com/emersion/go-imap"
 	"github.com/emersion/go-message/mail"
 )
 
+// Flag is an abstraction around the different flags which can be present in
+// different email backends and represents a flag that we use in the UI.
+type Flag int
+
+const (
+	// SeenFlag marks a message as having been seen previously
+	SeenFlag Flag = iota
+
+	// RecentFlag marks a message as being recent
+	RecentFlag
+
+	// AnsweredFlag marks a message as having been replied to
+	AnsweredFlag
+
+	// DeletedFlag marks a message as having been deleted
+	DeletedFlag
+
+	// FlaggedFlag marks a message with a user flag
+	FlaggedFlag
+)
+
 type Directory struct {
 	Name       string
 	Attributes []string
@@ -30,9 +54,9 @@ type DirectoryInfo struct {
 
 // A MessageInfo holds information about the structure of a message
 type MessageInfo struct {
-	BodyStructure *imap.BodyStructure
-	Envelope      *imap.Envelope
-	Flags         []string
+	BodyStructure *BodyStructure
+	Envelope      *Envelope
+	Flags         []Flag
 	InternalDate  time.Time
 	RFC822Headers *mail.Header
 	Size          uint32
@@ -50,3 +74,59 @@ type FullMessage struct {
 	Reader io.Reader
 	Uid    uint32
 }
+
+type BodyStructure struct {
+	MIMEType          string
+	MIMESubType       string
+	Params            map[string]string
+	Description       string
+	Encoding          string
+	Parts             []*BodyStructure
+	Disposition       string
+	DispositionParams map[string]string
+}
+
+type Envelope struct {
+	Date      time.Time
+	Subject   string
+	From      []*Address
+	ReplyTo   []*Address
+	To        []*Address
+	Cc        []*Address
+	Bcc       []*Address
+	MessageId string
+}
+
+type Address struct {
+	Name    string
+	Mailbox string
+	Host    string
+}
+
+var atom *regexp.Regexp = regexp.MustCompile("^[a-z0-9!#$%7'*+-/=?^_`{}|~ ]+$")
+
+func (a Address) Format() string {
+	if a.Name != "" {
+		if atom.MatchString(a.Name) {
+			return fmt.Sprintf("%s <%s@%s>", a.Name, a.Mailbox, a.Host)
+		} else {
+			return fmt.Sprintf("\"%s\" <%s@%s>",
+				strings.ReplaceAll(a.Name, "\"", "'"),
+				a.Mailbox, a.Host)
+		}
+	} else {
+		return fmt.Sprintf("<%s@%s>", a.Mailbox, a.Host)
+	}
+}
+
+// FormatAddresses formats a list of addresses, separating each by a comma
+func FormatAddresses(addrs []*Address) string {
+	val := bytes.Buffer{}
+	for i, addr := range addrs {
+		val.WriteString(addr.Format())
+		if i != len(addrs)-1 {
+			val.WriteString(", ")
+		}
+	}
+	return val.String()
+}