Factor UI models out of the worker message packagemdps1

Before, the information needed to display different parts of the UI was
tightly coupled to the specific messages being sent back and forth to
the backend worker. Separating out a models package allows us to be more
specific about exactly what a backend is able to and required to provide
for the UI.

1 files changed, 84 insertions, 4 deletions

diff --git a/models/models.go b/models/models.go
index 00297e9..1f6636f 100644
--- a/models/models.go
+++ b/models/models.go
@@ -1,18 +1,42 @@
 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
+)
+
 // 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
@@ -30,3 +54,59 @@ 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()
+}