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package maildir
import (
"io/ioutil"
"net/textproto"
"strings"
"unicode"
"github.com/emersion/go-maildir"
"git.sr.ht/~sircmpwn/getopt"
"git.sr.ht/~sircmpwn/aerc/models"
)
type searchCriteria struct {
Header textproto.MIMEHeader
Body []string
Text []string
WithFlags []maildir.Flag
WithoutFlags []maildir.Flag
}
func newSearchCriteria() *searchCriteria {
return &searchCriteria{Header: make(textproto.MIMEHeader)}
}
func parseSearch(args []string) (*searchCriteria, error) {
criteria := newSearchCriteria()
opts, optind, err := getopt.Getopts(args, "rubtH:f:")
if err != nil {
return nil, err
}
body := false
text := false
for _, opt := range opts {
switch opt.Option {
case 'r':
criteria.WithFlags = append(criteria.WithFlags, maildir.FlagSeen)
case 'u':
criteria.WithoutFlags = append(criteria.WithoutFlags, maildir.FlagSeen)
case 'H':
// TODO
case 'f':
criteria.Header.Add("From", opt.Value)
case 'b':
body = true
case 't':
text = true
}
}
if text {
criteria.Text = args[optind:]
} else if body {
criteria.Body = args[optind:]
} else {
for _, arg := range args[optind:] {
criteria.Header.Add("Subject", arg)
}
}
return criteria, nil
}
func (w *Worker) search(criteria *searchCriteria) ([]uint32, error) {
requiredParts := getRequiredParts(criteria)
w.worker.Logger.Printf("Required parts bitmask for search: %b", requiredParts)
keys, err := w.c.UIDs(*w.selected)
if err != nil {
return nil, err
}
matchedUids := []uint32{}
for _, key := range keys {
success, err := w.searchKey(key, criteria, requiredParts)
if err != nil {
return nil, err
} else if success {
matchedUids = append(matchedUids, key)
}
}
return matchedUids, nil
}
// Execute the search criteria for the given key, returns true if search succeeded
func (w *Worker) searchKey(key uint32, criteria *searchCriteria,
parts MsgParts) (bool, error) {
message, err := w.c.Message(*w.selected, key)
if err != nil {
return false, err
}
// setup parts of the message to use in the search
// this is so that we try to minimise reading unnecessary parts
var (
flags []maildir.Flag
header *models.MessageInfo
body string
all string
)
if parts&FLAGS > 0 {
flags, err = message.Flags()
if err != nil {
return false, err
}
}
if parts&HEADER > 0 {
header, err = message.MessageInfo()
if err != nil {
return false, err
}
}
if parts&BODY > 0 {
// TODO: select which part to search, maybe look for text/plain
reader, err := message.NewBodyPartReader([]int{1})
if err != nil {
return false, err
}
bytes, err := ioutil.ReadAll(reader)
if err != nil {
return false, err
}
body = string(bytes)
}
if parts&ALL > 0 {
reader, err := message.NewReader()
if err != nil {
return false, err
}
bytes, err := ioutil.ReadAll(reader)
if err != nil {
return false, err
}
all = string(bytes)
}
// now search through the criteria
// implicit AND at the moment so fail fast
if criteria.Header != nil {
for k, v := range criteria.Header {
headerValue := header.RFC822Headers.Get(k)
for _, text := range v {
if !containsSmartCase(headerValue, text) {
return false, nil
}
}
}
}
if criteria.Body != nil {
for _, searchTerm := range criteria.Body {
if !containsSmartCase(body, searchTerm) {
return false, nil
}
}
}
if criteria.Text != nil {
for _, searchTerm := range criteria.Text {
if !containsSmartCase(all, searchTerm) {
return false, nil
}
}
}
if criteria.WithFlags != nil {
for _, searchFlag := range criteria.WithFlags {
if !containsFlag(flags, searchFlag) {
return false, nil
}
}
}
if criteria.WithoutFlags != nil {
for _, searchFlag := range criteria.WithoutFlags {
if containsFlag(flags, searchFlag) {
return false, nil
}
}
}
return true, nil
}
// Returns true if searchFlag appears in flags
func containsFlag(flags []maildir.Flag, searchFlag maildir.Flag) bool {
match := false
for _, flag := range flags {
if searchFlag == flag {
match = true
}
}
return match
}
// Smarter version of strings.Contains for searching.
// Is case-insensitive unless substr contains an upper case character
func containsSmartCase(s string, substr string) bool {
if hasUpper(substr) {
return strings.Contains(s, substr)
}
return strings.Contains(strings.ToLower(s), strings.ToLower(substr))
}
func hasUpper(s string) bool {
for _, r := range s {
if unicode.IsUpper(r) {
return true
}
}
return false
}
// The parts of a message, kind of
type MsgParts int
const NONE MsgParts = 0
const (
FLAGS MsgParts = 1 << iota
HEADER
BODY
ALL
)
// Returns a bitmask of the parts of the message required to be loaded for the
// given criteria
func getRequiredParts(criteria *searchCriteria) MsgParts {
required := NONE
if len(criteria.Header) > 0 {
required |= HEADER
}
if criteria.Body != nil && len(criteria.Body) > 0 {
required |= BODY
}
if criteria.Text != nil && len(criteria.Text) > 0 {
required |= ALL
}
if criteria.WithFlags != nil && len(criteria.WithFlags) > 0 {
required |= FLAGS
}
if criteria.WithoutFlags != nil && len(criteria.WithoutFlags) > 0 {
required |= FLAGS
}
return required
}
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