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lookout.go
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lookout.go
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package main
import (
"fmt"
"github.com/fsnotify/fsnotify"
"log/slog"
"net/mail"
"os"
"regexp"
"strings"
)
// https://stackoverflow.com/a/57006724
const ISO8601 = "2006-01-02T15:04:05.000Z"
var webhookUrl string
var stampFilters []string
func main() {
slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, nil)))
webhookUrl = os.Getenv("LOOKOUT_WEBHOOK")
if webhookUrl == "" {
slog.Error("invalid config option", slogTag("invalid_config"), slog.String("option", "LOOKOUT_WEBHOOK"))
os.Exit(1)
}
stampsString := os.Getenv("LOOKOUT_STAMPS")
stampFilters = strings.Split(stampsString, ",")
if len(stampFilters) == 0 {
slog.Warn("LOOKOUT_STAMPS is empty, all phabricator emails will be matched", slogTag("missing_stamps"))
}
watcher, err := fsnotify.NewWatcher()
if err != nil {
slog.Error("failed to create watcher", slogTag("watcher_creation_failed"), slogError(err))
os.Exit(1)
}
go watchLoop(watcher)
err = watcher.Add("/mail")
if err != nil {
slog.Error("failed to watch /mail: is /mail volume mounted correctly?", slogTag("watcher_add_failed"), slogError(err))
os.Exit(1)
}
<-make(chan struct{}) // Block forever
}
func watchLoop(w *fsnotify.Watcher) {
for {
select {
case err, ok := <-w.Errors:
if !ok {
slog.Error("fsnotify watcher closed unexpectedly, exiting", slogTag("watcher_closed"), slog.String("channel", "w.Errors"))
os.Exit(1)
}
slog.Error("fsnotify watcher error", slogTag("watcher_error"), slogError(err))
case e, ok := <-w.Events:
if !ok {
slog.Error("fsnotify watcher closed unexpectedly, exiting", slogTag("watcher_closed"), slog.String("channel", "w.Events"))
os.Exit(1)
}
logger := slog.With(slog.String("name", e.Name))
logger.Info("watcher got new event", slogTag("watcher_event"), slog.String("op", e.Op.String()))
if e.Op.Has(fsnotify.Create) {
go handleCreate(e, logger)
}
}
}
}
var descriptionRegex = regexp.MustCompile(`(?s)(.+)\n\nTASK DETAIL\n {2}https://phabricator\.wikimedia\.org`)
// https://gerrit.wikimedia.org/r/plugins/gitiles/operations/puppet/+/703da43280b8ab00bd51602f83c38a108285cb25/modules/phabricator/data/fixed_settings.yaml#49
// https://secure.phabricator.com/uiexample/view/PHUIColorPalletteExample/
var priorityColours = map[string]int{
"100": 0xda49be,
"90": 0x8e44ad,
"80": 0xc0392b,
"50": 0xe67e22,
"25": 0xf1c40f,
"10": 0x3498db,
}
func handleCreate(e fsnotify.Event, logger *slog.Logger) {
file, err := os.Open(e.Name)
if err != nil {
logger.Error("failed to open file", slogTag("open_failed"), slogError(err))
return
}
parsedMail, err := ParseMail(file, logger)
if err != nil {
// error already logged in ParseMail
return
}
stamps := parsedMail.Message.Header.Get("X-Phabricator-Stamps")
subject := parsedMail.Message.Header.Get("Subject")
if parsedMail.Message.Header.Get("X-Phabricator-Sent-This-Message") == "Yes" && strings.Contains(stamps, "application(Maniphest)") && MatchesStampFilter(stamps) {
mailId := parsedMail.Message.Header.Get("X-Phabricator-Mail-ID")
logger.Info("got maniphest email", slogTag("maniphest_email"), slog.String("mailId", mailId), slog.String("subject", subject), slog.String("stamps", stamps))
logger = slog.With("mailId", mailId) // log with mailId instead of filename to save log space
embed := Embed{
Author: &EmbedAuthor{},
Title: subject[12:], // remove "[Maniphest] " from subject
Fields: []*EmbedField{},
}
description := descriptionRegex.FindStringSubmatch(parsedMail.PlainBody)
if len(description) < 2 {
logger.Error("missing description", slogTag("missing_description"), slog.String("plainBody", parsedMail.PlainBody))
} else {
embed.Description = description[1]
}
if monogram := GetStamp("monogram", stamps, logger); monogram != "" {
embed.URL = "https://phabricator.wikimedia.org/" + monogram
}
if actor := GetStamp("actor", stamps, logger); actor != "" {
embed.Author.Name = actor
embed.Author.URL = "https://phabricator.wikimedia.org/p/" + actor[1:] // remove initial @ from the actor for url
}
if status := GetStamp("status", stamps, logger); status != "" {
embed.Fields = append(embed.Fields, &EmbedField{
Name: "Status",
Value: strings.ToUpper(status[:1]) + status[1:],
Inline: true,
})
}
if owner := GetStamp("task-owner", stamps, dummyLogger); owner != "" {
embed.Fields = append(embed.Fields, &EmbedField{
Name: "Assignee",
Value: fmt.Sprintf("[%s](https://phabricator.wikimedia.org/p/%s)", owner, owner[1:]), // remove initial @ from the assignee for url
Inline: true,
})
} else {
embed.Fields = append(embed.Fields, &EmbedField{
Name: "Assignee",
Value: "(none)",
Inline: true,
})
}
if tag := GetStamp("tag", stamps, dummyLogger); tag != "" {
embed.Fields = append(embed.Fields, &EmbedField{
Name: "Tag",
Value: fmt.Sprintf("[%s](https://phabricator.wikimedia.org/tag/%s)", tag, tag[1:]), // remove initial # from the tag for url
Inline: true,
})
} else {
embed.Fields = append(embed.Fields, &EmbedField{
Name: "Tag",
Value: "(none)",
Inline: true,
})
}
if time, err := mail.ParseDate(parsedMail.Message.Header.Get("Date")); err != nil {
slog.Error("failed to parse date header", slogTag("invalid_date"), slogError(err), slog.String("date", parsedMail.Message.Header.Get("Date")))
} else {
embed.Timestamp = time.Format(ISO8601)
}
if priority := GetStamp("task-priority", stamps, logger); priority != "" {
embed.Color = priorityColours[priority]
}
executeWebhook(ExecuteWebhookPayload{
Embeds: []Embed{embed},
})
}
}