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package imap
import (
"strings"
)
// Resp is an IMAP response. It is either a *DataResp, a
// *ContinuationReq or a *StatusResp.
type Resp interface {
resp()
}
// ReadResp reads a single response from a Reader.
func ReadResp(r *Reader) (Resp, error) {
atom, err := r.ReadAtom()
if err != nil {
return nil, err
}
tag, ok := atom.(string)
if !ok {
return nil, newParseError("response tag is not an atom")
}
if tag == "+" {
if err := r.ReadSp(); err != nil {
r.UnreadRune()
}
resp := &ContinuationReq{}
resp.Info, err = r.ReadInfo()
if err != nil {
return nil, err
}
return resp, nil
}
if err := r.ReadSp(); err != nil {
return nil, err
}
// Can be either data or status
// Try to parse a status
var fields []interface{}
if atom, err := r.ReadAtom(); err == nil {
fields = append(fields, atom)
if err := r.ReadSp(); err == nil {
if name, ok := atom.(string); ok {
status := StatusRespType(name)
switch status {
case StatusRespOk, StatusRespNo, StatusRespBad, StatusRespPreauth, StatusRespBye:
resp := &StatusResp{
Tag: tag,
Type: status,
}
char, _, err := r.ReadRune()
if err != nil {
return nil, err
}
r.UnreadRune()
if char == '[' {
// Contains code & arguments
resp.Code, resp.Arguments, err = r.ReadRespCode()
if err != nil {
return nil, err
}
}
resp.Info, err = r.ReadInfo()
if err != nil {
return nil, err
}
return resp, nil
}
}
} else {
r.UnreadRune()
}
} else {
r.UnreadRune()
}
// Not a status so it's data
resp := &DataResp{Tag: tag}
var remaining []interface{}
remaining, err = r.ReadLine()
if err != nil {
return nil, err
}
resp.Fields = append(fields, remaining...)
return resp, nil
}
// DataResp is an IMAP response containing data.
type DataResp struct {
// The response tag. Can be either "" for untagged responses, "+" for continuation
// requests or a previous command's tag.
Tag string
// The parsed response fields.
Fields []interface{}
}
// NewUntaggedResp creates a new untagged response.
func NewUntaggedResp(fields []interface{}) *DataResp {
return &DataResp{
Tag: "*",
Fields: fields,
}
}
func (r *DataResp) resp() {}
func (r *DataResp) WriteTo(w *Writer) error {
tag := RawString(r.Tag)
if tag == "" {
tag = RawString("*")
}
fields := []interface{}{RawString(tag)}
fields = append(fields, r.Fields...)
return w.writeLine(fields...)
}
// ContinuationReq is a continuation request response.
type ContinuationReq struct {
// The info message sent with the continuation request.
Info string
}
func (r *ContinuationReq) resp() {}
func (r *ContinuationReq) WriteTo(w *Writer) error {
if err := w.writeString("+"); err != nil {
return err
}
if r.Info != "" {
if err := w.writeString(string(sp) + r.Info); err != nil {
return err
}
}
return w.writeCrlf()
}
// ParseNamedResp attempts to parse a named data response.
func ParseNamedResp(resp Resp) (name string, fields []interface{}, ok bool) {
data, ok := resp.(*DataResp)
if !ok || len(data.Fields) == 0 {
return
}
// Some responses (namely EXISTS and RECENT) are formatted like so:
// [num] [name] [...]
// Which is fucking stupid. But we handle that here by checking if the
// response name is a number and then rearranging it.
if len(data.Fields) > 1 {
name, ok := data.Fields[1].(string)
if ok {
if _, err := ParseNumber(data.Fields[0]); err == nil {
fields := []interface{}{data.Fields[0]}
fields = append(fields, data.Fields[2:]...)
return strings.ToUpper(name), fields, true
}
}
}
// IMAP commands are formatted like this:
// [name] [...]
name, ok = data.Fields[0].(string)
if !ok {
return
}
return strings.ToUpper(name), data.Fields[1:], true
}
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