initial commit

27 files changed, 1098 insertions, 0 deletions

diff --git a/vendor/github.com/emersion/go-imap/commands/append.go b/vendor/github.com/emersion/go-imap/commands/append.go
new file mode 100644
index 0000000..d70b584
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/append.go
@@ -0,0 +1,93 @@
+package commands
+
+import (
+	"errors"
+	"time"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Append is an APPEND command, as defined in RFC 3501 section 6.3.11.
+type Append struct {
+	Mailbox string
+	Flags   []string
+	Date    time.Time
+	Message imap.Literal
+}
+
+func (cmd *Append) Command() *imap.Command {
+	var args []interface{}
+
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+	args = append(args, imap.FormatMailboxName(mailbox))
+
+	if cmd.Flags != nil {
+		flags := make([]interface{}, len(cmd.Flags))
+		for i, flag := range cmd.Flags {
+			flags[i] = imap.RawString(flag)
+		}
+		args = append(args, flags)
+	}
+
+	if !cmd.Date.IsZero() {
+		args = append(args, cmd.Date)
+	}
+
+	args = append(args, cmd.Message)
+
+	return &imap.Command{
+		Name:      "APPEND",
+		Arguments: args,
+	}
+}
+
+func (cmd *Append) Parse(fields []interface{}) (err error) {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	// Parse mailbox name
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err = utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	// Parse message literal
+	litIndex := len(fields) - 1
+	var ok bool
+	if cmd.Message, ok = fields[litIndex].(imap.Literal); !ok {
+		return errors.New("Message must be a literal")
+	}
+
+	// Remaining fields a optional
+	fields = fields[1:litIndex]
+	if len(fields) > 0 {
+		// Parse flags list
+		if flags, ok := fields[0].([]interface{}); ok {
+			if cmd.Flags, err = imap.ParseStringList(flags); err != nil {
+				return err
+			}
+
+			for i, flag := range cmd.Flags {
+				cmd.Flags[i] = imap.CanonicalFlag(flag)
+			}
+
+			fields = fields[1:]
+		}
+
+		// Parse date
+		if len(fields) > 0 {
+			if date, ok := fields[0].(string); !ok {
+				return errors.New("Date must be a string")
+			} else if cmd.Date, err = time.Parse(imap.DateTimeLayout, date); err != nil {
+				return err
+			}
+		}
+	}
+
+	return
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/authenticate.go b/vendor/github.com/emersion/go-imap/commands/authenticate.go
new file mode 100644
index 0000000..b66f21f
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/authenticate.go
@@ -0,0 +1,124 @@
+package commands
+
+import (
+	"bufio"
+	"encoding/base64"
+	"errors"
+	"io"
+	"strings"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-sasl"
+)
+
+// AuthenticateConn is a connection that supports IMAP authentication.
+type AuthenticateConn interface {
+	io.Reader
+
+	// WriteResp writes an IMAP response to this connection.
+	WriteResp(res imap.WriterTo) error
+}
+
+// Authenticate is an AUTHENTICATE command, as defined in RFC 3501 section
+// 6.2.2.
+type Authenticate struct {
+	Mechanism       string
+	InitialResponse []byte
+}
+
+func (cmd *Authenticate) Command() *imap.Command {
+	args := []interface{}{imap.RawString(cmd.Mechanism)}
+	if cmd.InitialResponse != nil {
+		var encodedResponse string
+		if len(cmd.InitialResponse) == 0 {
+			// Empty initial response should be encoded as "=", not empty
+			// string.
+			encodedResponse = "="
+		} else {
+			encodedResponse = base64.StdEncoding.EncodeToString(cmd.InitialResponse)
+		}
+
+		args = append(args, imap.RawString(encodedResponse))
+	}
+	return &imap.Command{
+		Name:      "AUTHENTICATE",
+		Arguments: args,
+	}
+}
+
+func (cmd *Authenticate) Parse(fields []interface{}) error {
+	if len(fields) < 1 {
+		return errors.New("Not enough arguments")
+	}
+
+	var ok bool
+	if cmd.Mechanism, ok = fields[0].(string); !ok {
+		return errors.New("Mechanism must be a string")
+	}
+	cmd.Mechanism = strings.ToUpper(cmd.Mechanism)
+
+	if len(fields) != 2 {
+		return nil
+	}
+
+	encodedResponse, ok := fields[1].(string)
+	if !ok {
+		return errors.New("Initial response must be a string")
+	}
+	if encodedResponse == "=" {
+		cmd.InitialResponse = []byte{}
+		return nil
+	}
+
+	var err error
+	cmd.InitialResponse, err = base64.StdEncoding.DecodeString(encodedResponse)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (cmd *Authenticate) Handle(mechanisms map[string]sasl.Server, conn AuthenticateConn) error {
+	sasl, ok := mechanisms[cmd.Mechanism]
+	if !ok {
+		return errors.New("Unsupported mechanism")
+	}
+
+	scanner := bufio.NewScanner(conn)
+
+	response := cmd.InitialResponse
+	for {
+		challenge, done, err := sasl.Next(response)
+		if err != nil || done {
+			return err
+		}
+
+		encoded := base64.StdEncoding.EncodeToString(challenge)
+		cont := &imap.ContinuationReq{Info: encoded}
+		if err := conn.WriteResp(cont); err != nil {
+			return err
+		}
+
+		if !scanner.Scan() {
+			if err := scanner.Err(); err != nil {
+				return err
+			}
+			return errors.New("unexpected EOF")
+		}
+
+		encoded = scanner.Text()
+		if encoded != "" {
+			if encoded == "*" {
+				return &imap.ErrStatusResp{Resp: &imap.StatusResp{
+					Type: imap.StatusRespBad,
+					Info: "negotiation cancelled",
+				}}
+			}
+			response, err = base64.StdEncoding.DecodeString(encoded)
+			if err != nil {
+				return err
+			}
+		}
+	}
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/capability.go b/vendor/github.com/emersion/go-imap/commands/capability.go
new file mode 100644
index 0000000..3359c0a
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/capability.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Capability is a CAPABILITY command, as defined in RFC 3501 section 6.1.1.
+type Capability struct{}
+
+func (c *Capability) Command() *imap.Command {
+	return &imap.Command{
+		Name: "CAPABILITY",
+	}
+}
+
+func (c *Capability) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/check.go b/vendor/github.com/emersion/go-imap/commands/check.go
new file mode 100644
index 0000000..b90df7c
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/check.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Check is a CHECK command, as defined in RFC 3501 section 6.4.1.
+type Check struct{}
+
+func (cmd *Check) Command() *imap.Command {
+	return &imap.Command{
+		Name: "CHECK",
+	}
+}
+
+func (cmd *Check) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/close.go b/vendor/github.com/emersion/go-imap/commands/close.go
new file mode 100644
index 0000000..cc60658
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/close.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Close is a CLOSE command, as defined in RFC 3501 section 6.4.2.
+type Close struct{}
+
+func (cmd *Close) Command() *imap.Command {
+	return &imap.Command{
+		Name: "CLOSE",
+	}
+}
+
+func (cmd *Close) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/commands.go b/vendor/github.com/emersion/go-imap/commands/commands.go
new file mode 100644
index 0000000..a62b248
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/commands.go
@@ -0,0 +1,2 @@
+// Package commands implements IMAP commands defined in RFC 3501.
+package commands
diff --git a/vendor/github.com/emersion/go-imap/commands/copy.go b/vendor/github.com/emersion/go-imap/commands/copy.go
new file mode 100644
index 0000000..5258f35
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/copy.go
@@ -0,0 +1,47 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Copy is a COPY command, as defined in RFC 3501 section 6.4.7.
+type Copy struct {
+	SeqSet  *imap.SeqSet
+	Mailbox string
+}
+
+func (cmd *Copy) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "COPY",
+		Arguments: []interface{}{cmd.SeqSet, imap.FormatMailboxName(mailbox)},
+	}
+}
+
+func (cmd *Copy) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	if seqSet, ok := fields[0].(string); !ok {
+		return errors.New("Invalid sequence set")
+	} else if seqSet, err := imap.ParseSeqSet(seqSet); err != nil {
+		return err
+	} else {
+		cmd.SeqSet = seqSet
+	}
+
+	if mailbox, err := imap.ParseString(fields[1]); err != nil {
+		return err
+	} else if mailbox, err := utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/create.go b/vendor/github.com/emersion/go-imap/commands/create.go
new file mode 100644
index 0000000..a1e6fe2
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/create.go
@@ -0,0 +1,38 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Create is a CREATE command, as defined in RFC 3501 section 6.3.3.
+type Create struct {
+	Mailbox string
+}
+
+func (cmd *Create) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "CREATE",
+		Arguments: []interface{}{mailbox},
+	}
+}
+
+func (cmd *Create) Parse(fields []interface{}) error {
+	if len(fields) < 1 {
+		return errors.New("No enough arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err := utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/delete.go b/vendor/github.com/emersion/go-imap/commands/delete.go
new file mode 100644
index 0000000..60f4da8
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/delete.go
@@ -0,0 +1,38 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Delete is a DELETE command, as defined in RFC 3501 section 6.3.3.
+type Delete struct {
+	Mailbox string
+}
+
+func (cmd *Delete) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "DELETE",
+		Arguments: []interface{}{imap.FormatMailboxName(mailbox)},
+	}
+}
+
+func (cmd *Delete) Parse(fields []interface{}) error {
+	if len(fields) < 1 {
+		return errors.New("No enough arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err := utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/enable.go b/vendor/github.com/emersion/go-imap/commands/enable.go
new file mode 100644
index 0000000..980195e
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/enable.go
@@ -0,0 +1,23 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// An ENABLE command, defined in RFC 5161 section 3.1.
+type Enable struct {
+	Caps []string
+}
+
+func (cmd *Enable) Command() *imap.Command {
+	return &imap.Command{
+		Name:      "ENABLE",
+		Arguments: imap.FormatStringList(cmd.Caps),
+	}
+}
+
+func (cmd *Enable) Parse(fields []interface{}) error {
+	var err error
+	cmd.Caps, err = imap.ParseStringList(fields)
+	return err
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/expunge.go b/vendor/github.com/emersion/go-imap/commands/expunge.go
new file mode 100644
index 0000000..af550a4
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/expunge.go
@@ -0,0 +1,16 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Expunge is an EXPUNGE command, as defined in RFC 3501 section 6.4.3.
+type Expunge struct{}
+
+func (cmd *Expunge) Command() *imap.Command {
+	return &imap.Command{Name: "EXPUNGE"}
+}
+
+func (cmd *Expunge) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/fetch.go b/vendor/github.com/emersion/go-imap/commands/fetch.go
new file mode 100644
index 0000000..4eb3ab9
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/fetch.go
@@ -0,0 +1,63 @@
+package commands
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/emersion/go-imap"
+)
+
+// Fetch is a FETCH command, as defined in RFC 3501 section 6.4.5.
+type Fetch struct {
+	SeqSet *imap.SeqSet
+	Items  []imap.FetchItem
+}
+
+func (cmd *Fetch) Command() *imap.Command {
+	// Handle FETCH macros separately as they should not be serialized within parentheses
+	if len(cmd.Items) == 1 && (cmd.Items[0] == imap.FetchAll || cmd.Items[0] == imap.FetchFast || cmd.Items[0] == imap.FetchFull) {
+		return &imap.Command{
+			Name:      "FETCH",
+			Arguments: []interface{}{cmd.SeqSet, imap.RawString(cmd.Items[0])},
+		}
+	} else {
+		items := make([]interface{}, len(cmd.Items))
+		for i, item := range cmd.Items {
+			items[i] = imap.RawString(item)
+		}
+
+		return &imap.Command{
+			Name:      "FETCH",
+			Arguments: []interface{}{cmd.SeqSet, items},
+		}
+	}
+}
+
+func (cmd *Fetch) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	var err error
+	if seqset, ok := fields[0].(string); !ok {
+		return errors.New("Sequence set must be an atom")
+	} else if cmd.SeqSet, err = imap.ParseSeqSet(seqset); err != nil {
+		return err
+	}
+
+	switch items := fields[1].(type) {
+	case string: // A macro or a single item
+		cmd.Items = imap.FetchItem(strings.ToUpper(items)).Expand()
+	case []interface{}: // A list of items
+		cmd.Items = make([]imap.FetchItem, 0, len(items))
+		for _, v := range items {
+			itemStr, _ := v.(string)
+			item := imap.FetchItem(strings.ToUpper(itemStr))
+			cmd.Items = append(cmd.Items, item.Expand()...)
+		}
+	default:
+		return errors.New("Items must be either a string or a list")
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/idle.go b/vendor/github.com/emersion/go-imap/commands/idle.go
new file mode 100644
index 0000000..4d9669f
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/idle.go
@@ -0,0 +1,17 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// An IDLE command.
+// Se RFC 2177 section 3.
+type Idle struct{}
+
+func (cmd *Idle) Command() *imap.Command {
+	return &imap.Command{Name: "IDLE"}
+}
+
+func (cmd *Idle) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/list.go b/vendor/github.com/emersion/go-imap/commands/list.go
new file mode 100644
index 0000000..52686e9
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/list.go
@@ -0,0 +1,60 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// List is a LIST command, as defined in RFC 3501 section 6.3.8. If Subscribed
+// is set to true, LSUB will be used instead.
+type List struct {
+	Reference string
+	Mailbox   string
+
+	Subscribed bool
+}
+
+func (cmd *List) Command() *imap.Command {
+	name := "LIST"
+	if cmd.Subscribed {
+		name = "LSUB"
+	}
+
+	enc := utf7.Encoding.NewEncoder()
+	ref, _ := enc.String(cmd.Reference)
+	mailbox, _ := enc.String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      name,
+		Arguments: []interface{}{ref, mailbox},
+	}
+}
+
+func (cmd *List) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	dec := utf7.Encoding.NewDecoder()
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err := dec.String(mailbox); err != nil {
+		return err
+	} else {
+		// TODO: canonical mailbox path
+		cmd.Reference = imap.CanonicalMailboxName(mailbox)
+	}
+
+	if mailbox, err := imap.ParseString(fields[1]); err != nil {
+		return err
+	} else if mailbox, err := dec.String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/login.go b/vendor/github.com/emersion/go-imap/commands/login.go
new file mode 100644
index 0000000..d0af0b5
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/login.go
@@ -0,0 +1,36 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+)
+
+// Login is a LOGIN command, as defined in RFC 3501 section 6.2.2.
+type Login struct {
+	Username string
+	Password string
+}
+
+func (cmd *Login) Command() *imap.Command {
+	return &imap.Command{
+		Name:      "LOGIN",
+		Arguments: []interface{}{cmd.Username, cmd.Password},
+	}
+}
+
+func (cmd *Login) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("Not enough arguments")
+	}
+
+	var err error
+	if cmd.Username, err = imap.ParseString(fields[0]); err != nil {
+		return err
+	}
+	if cmd.Password, err = imap.ParseString(fields[1]); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/logout.go b/vendor/github.com/emersion/go-imap/commands/logout.go
new file mode 100644
index 0000000..e826719
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/logout.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Logout is a LOGOUT command, as defined in RFC 3501 section 6.1.3.
+type Logout struct{}
+
+func (c *Logout) Command() *imap.Command {
+	return &imap.Command{
+		Name: "LOGOUT",
+	}
+}
+
+func (c *Logout) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/move.go b/vendor/github.com/emersion/go-imap/commands/move.go
new file mode 100644
index 0000000..613a870
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/move.go
@@ -0,0 +1,48 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// A MOVE command.
+// See RFC 6851 section 3.1.
+type Move struct {
+	SeqSet  *imap.SeqSet
+	Mailbox string
+}
+
+func (cmd *Move) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "MOVE",
+		Arguments: []interface{}{cmd.SeqSet, mailbox},
+	}
+}
+
+func (cmd *Move) Parse(fields []interface{}) (err error) {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	seqset, ok := fields[0].(string)
+	if !ok {
+		return errors.New("Invalid sequence set")
+	}
+	if cmd.SeqSet, err = imap.ParseSeqSet(seqset); err != nil {
+		return err
+	}
+
+	mailbox, ok := fields[1].(string)
+	if !ok {
+		return errors.New("Mailbox name must be a string")
+	}
+	if cmd.Mailbox, err = utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	}
+
+	return
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/noop.go b/vendor/github.com/emersion/go-imap/commands/noop.go
new file mode 100644
index 0000000..da6a1c2
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/noop.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// Noop is a NOOP command, as defined in RFC 3501 section 6.1.2.
+type Noop struct{}
+
+func (c *Noop) Command() *imap.Command {
+	return &imap.Command{
+		Name: "NOOP",
+	}
+}
+
+func (c *Noop) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/rename.go b/vendor/github.com/emersion/go-imap/commands/rename.go
new file mode 100644
index 0000000..37a5fa7
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/rename.go
@@ -0,0 +1,51 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Rename is a RENAME command, as defined in RFC 3501 section 6.3.5.
+type Rename struct {
+	Existing string
+	New      string
+}
+
+func (cmd *Rename) Command() *imap.Command {
+	enc := utf7.Encoding.NewEncoder()
+	existingName, _ := enc.String(cmd.Existing)
+	newName, _ := enc.String(cmd.New)
+
+	return &imap.Command{
+		Name:      "RENAME",
+		Arguments: []interface{}{imap.FormatMailboxName(existingName), imap.FormatMailboxName(newName)},
+	}
+}
+
+func (cmd *Rename) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	dec := utf7.Encoding.NewDecoder()
+
+	if existingName, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if existingName, err := dec.String(existingName); err != nil {
+		return err
+	} else {
+		cmd.Existing = imap.CanonicalMailboxName(existingName)
+	}
+
+	if newName, err := imap.ParseString(fields[1]); err != nil {
+		return err
+	} else if newName, err := dec.String(newName); err != nil {
+		return err
+	} else {
+		cmd.New = imap.CanonicalMailboxName(newName)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/search.go b/vendor/github.com/emersion/go-imap/commands/search.go
new file mode 100644
index 0000000..72f026c
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/search.go
@@ -0,0 +1,57 @@
+package commands
+
+import (
+	"errors"
+	"io"
+	"strings"
+
+	"github.com/emersion/go-imap"
+)
+
+// Search is a SEARCH command, as defined in RFC 3501 section 6.4.4.
+type Search struct {
+	Charset  string
+	Criteria *imap.SearchCriteria
+}
+
+func (cmd *Search) Command() *imap.Command {
+	var args []interface{}
+	if cmd.Charset != "" {
+		args = append(args, imap.RawString("CHARSET"), imap.RawString(cmd.Charset))
+	}
+	args = append(args, cmd.Criteria.Format()...)
+
+	return &imap.Command{
+		Name:      "SEARCH",
+		Arguments: args,
+	}
+}
+
+func (cmd *Search) Parse(fields []interface{}) error {
+	if len(fields) == 0 {
+		return errors.New("Missing search criteria")
+	}
+
+	// Parse charset
+	if f, ok := fields[0].(string); ok && strings.EqualFold(f, "CHARSET") {
+		if len(fields) < 2 {
+			return errors.New("Missing CHARSET value")
+		}
+		if cmd.Charset, ok = fields[1].(string); !ok {
+			return errors.New("Charset must be a string")
+		}
+		fields = fields[2:]
+	}
+
+	var charsetReader func(io.Reader) io.Reader
+	charset := strings.ToLower(cmd.Charset)
+	if charset != "utf-8" && charset != "us-ascii" && charset != "" {
+		charsetReader = func(r io.Reader) io.Reader {
+			r, _ = imap.CharsetReader(charset, r)
+			return r
+		}
+	}
+
+	cmd.Criteria = new(imap.SearchCriteria)
+	return cmd.Criteria.ParseWithCharset(fields, charsetReader)
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/select.go b/vendor/github.com/emersion/go-imap/commands/select.go
new file mode 100644
index 0000000..e881eff
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/select.go
@@ -0,0 +1,45 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Select is a SELECT command, as defined in RFC 3501 section 6.3.1. If ReadOnly
+// is set to true, the EXAMINE command will be used instead.
+type Select struct {
+	Mailbox  string
+	ReadOnly bool
+}
+
+func (cmd *Select) Command() *imap.Command {
+	name := "SELECT"
+	if cmd.ReadOnly {
+		name = "EXAMINE"
+	}
+
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      name,
+		Arguments: []interface{}{imap.FormatMailboxName(mailbox)},
+	}
+}
+
+func (cmd *Select) Parse(fields []interface{}) error {
+	if len(fields) < 1 {
+		return errors.New("No enough arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err := utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/starttls.go b/vendor/github.com/emersion/go-imap/commands/starttls.go
new file mode 100644
index 0000000..d900e5e
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/starttls.go
@@ -0,0 +1,18 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// StartTLS is a STARTTLS command, as defined in RFC 3501 section 6.2.1.
+type StartTLS struct{}
+
+func (cmd *StartTLS) Command() *imap.Command {
+	return &imap.Command{
+		Name: "STARTTLS",
+	}
+}
+
+func (cmd *StartTLS) Parse(fields []interface{}) error {
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/status.go b/vendor/github.com/emersion/go-imap/commands/status.go
new file mode 100644
index 0000000..672dce5
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/status.go
@@ -0,0 +1,58 @@
+package commands
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Status is a STATUS command, as defined in RFC 3501 section 6.3.10.
+type Status struct {
+	Mailbox string
+	Items   []imap.StatusItem
+}
+
+func (cmd *Status) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	items := make([]interface{}, len(cmd.Items))
+	for i, item := range cmd.Items {
+		items[i] = imap.RawString(item)
+	}
+
+	return &imap.Command{
+		Name:      "STATUS",
+		Arguments: []interface{}{imap.FormatMailboxName(mailbox), items},
+	}
+}
+
+func (cmd *Status) Parse(fields []interface{}) error {
+	if len(fields) < 2 {
+		return errors.New("No enough arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if mailbox, err := utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	} else {
+		cmd.Mailbox = imap.CanonicalMailboxName(mailbox)
+	}
+
+	items, ok := fields[1].([]interface{})
+	if !ok {
+		return errors.New("STATUS command parameter is not a list")
+	}
+	cmd.Items = make([]imap.StatusItem, len(items))
+	for i, f := range items {
+		if s, ok := f.(string); !ok {
+			return errors.New("Got a non-string field in a STATUS command parameter")
+		} else {
+			cmd.Items[i] = imap.StatusItem(strings.ToUpper(s))
+		}
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/store.go b/vendor/github.com/emersion/go-imap/commands/store.go
new file mode 100644
index 0000000..aeee3e6
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/store.go
@@ -0,0 +1,50 @@
+package commands
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/emersion/go-imap"
+)
+
+// Store is a STORE command, as defined in RFC 3501 section 6.4.6.
+type Store struct {
+	SeqSet *imap.SeqSet
+	Item   imap.StoreItem
+	Value  interface{}
+}
+
+func (cmd *Store) Command() *imap.Command {
+	return &imap.Command{
+		Name:      "STORE",
+		Arguments: []interface{}{cmd.SeqSet, imap.RawString(cmd.Item), cmd.Value},
+	}
+}
+
+func (cmd *Store) Parse(fields []interface{}) error {
+	if len(fields) < 3 {
+		return errors.New("No enough arguments")
+	}
+
+	seqset, ok := fields[0].(string)
+	if !ok {
+		return errors.New("Invalid sequence set")
+	}
+	var err error
+	if cmd.SeqSet, err = imap.ParseSeqSet(seqset); err != nil {
+		return err
+	}
+
+	if item, ok := fields[1].(string); !ok {
+		return errors.New("Item name must be a string")
+	} else {
+		cmd.Item = imap.StoreItem(strings.ToUpper(item))
+	}
+
+	if len(fields[2:]) == 1 {
+		cmd.Value = fields[2]
+	} else {
+		cmd.Value = fields[2:]
+	}
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/subscribe.go b/vendor/github.com/emersion/go-imap/commands/subscribe.go
new file mode 100644
index 0000000..6540969
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/subscribe.go
@@ -0,0 +1,63 @@
+package commands
+
+import (
+	"errors"
+
+	"github.com/emersion/go-imap"
+	"github.com/emersion/go-imap/utf7"
+)
+
+// Subscribe is a SUBSCRIBE command, as defined in RFC 3501 section 6.3.6.
+type Subscribe struct {
+	Mailbox string
+}
+
+func (cmd *Subscribe) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "SUBSCRIBE",
+		Arguments: []interface{}{imap.FormatMailboxName(mailbox)},
+	}
+}
+
+func (cmd *Subscribe) Parse(fields []interface{}) error {
+	if len(fields) < 0 {
+		return errors.New("No enough arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if cmd.Mailbox, err = utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	}
+	return nil
+}
+
+// An UNSUBSCRIBE command.
+// See RFC 3501 section 6.3.7
+type Unsubscribe struct {
+	Mailbox string
+}
+
+func (cmd *Unsubscribe) Command() *imap.Command {
+	mailbox, _ := utf7.Encoding.NewEncoder().String(cmd.Mailbox)
+
+	return &imap.Command{
+		Name:      "UNSUBSCRIBE",
+		Arguments: []interface{}{imap.FormatMailboxName(mailbox)},
+	}
+}
+
+func (cmd *Unsubscribe) Parse(fields []interface{}) error {
+	if len(fields) < 0 {
+		return errors.New("No enogh arguments")
+	}
+
+	if mailbox, err := imap.ParseString(fields[0]); err != nil {
+		return err
+	} else if cmd.Mailbox, err = utf7.Encoding.NewDecoder().String(mailbox); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/uid.go b/vendor/github.com/emersion/go-imap/commands/uid.go
new file mode 100644
index 0000000..979af14
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/uid.go
@@ -0,0 +1,44 @@
+package commands
+
+import (
+	"errors"
+	"strings"
+
+	"github.com/emersion/go-imap"
+)
+
+// Uid is a UID command, as defined in RFC 3501 section 6.4.8. It wraps another
+// command (e.g. wrapping a Fetch command will result in a UID FETCH).
+type Uid struct {
+	Cmd imap.Commander
+}
+
+func (cmd *Uid) Command() *imap.Command {
+	inner := cmd.Cmd.Command()
+
+	args := []interface{}{imap.RawString(inner.Name)}
+	args = append(args, inner.Arguments...)
+
+	return &imap.Command{
+		Name:      "UID",
+		Arguments: args,
+	}
+}
+
+func (cmd *Uid) Parse(fields []interface{}) error {
+	if len(fields) < 0 {
+		return errors.New("No command name specified")
+	}
+
+	name, ok := fields[0].(string)
+	if !ok {
+		return errors.New("Command name must be a string")
+	}
+
+	cmd.Cmd = &imap.Command{
+		Name:      strings.ToUpper(name), // Command names are case-insensitive
+		Arguments: fields[1:],
+	}
+
+	return nil
+}
diff --git a/vendor/github.com/emersion/go-imap/commands/unselect.go b/vendor/github.com/emersion/go-imap/commands/unselect.go
new file mode 100644
index 0000000..da5c63d
--- /dev/null
+++ b/vendor/github.com/emersion/go-imap/commands/unselect.go
@@ -0,0 +1,17 @@
+package commands
+
+import (
+	"github.com/emersion/go-imap"
+)
+
+// An UNSELECT command.
+// See RFC 3691 section 2.
+type Unselect struct{}
+
+func (cmd *Unselect) Command() *imap.Command {
+	return &imap.Command{Name: "UNSELECT"}
+}
+
+func (cmd *Unselect) Parse(fields []interface{}) error {
+	return nil
+}