Expose public/ API as submodule (#23345)

* model -> public/model

* plugin -> public/plugin

* public/model/utils -> public/utils

* platform/shared/mlog -> public/shared/mlog

* platform/shared/i18n -> public/shared/i18n

* platform/shared/markdown -> public/shared/markdown

* platform/services/timezones -> public/shared/timezones

* channels/einterfaces -> einterfaces

* expose public/ submodule

* go mod tidy

* .github: cache-dependency-path, setup-go-work

* modules-tidy for public/ too

* remove old gomodtidy

server/public/model/status.go

@@ -0,0 +1,68 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"encoding/json"
+)
+
+const (
+	StatusOutOfOffice    = "ooo"
+	StatusOffline        = "offline"
+	StatusAway           = "away"
+	StatusDnd            = "dnd"
+	StatusOnline         = "online"
+	StatusCacheSize      = SessionCacheSize
+	StatusChannelTimeout = 20000  // 20 seconds
+	StatusMinUpdateTime  = 120000 // 2 minutes
+)
+
+type Status struct {
+	UserId         string `json:"user_id"`
+	Status         string `json:"status"`
+	Manual         bool   `json:"manual"`
+	LastActivityAt int64  `json:"last_activity_at"`
+	ActiveChannel  string `json:"active_channel,omitempty" db:"-"`
+	DNDEndTime     int64  `json:"dnd_end_time"`
+	PrevStatus     string `json:"-"`
+}
+
+func (s *Status) ToJSON() ([]byte, error) {
+	sCopy := *s
+	sCopy.ActiveChannel = ""
+	return json.Marshal(sCopy)
+}
+
+// The following are some GraphQL methods necessary to return the
+// data in float64 type. The spec doesn't support 64 bit integers,
+// so we have to pass the data in float64. The _ at the end is
+// a hack to keep the attribute name same in GraphQL schema.
+
+func (s *Status) LastActivityAt_() float64 {
+	return float64(s.LastActivityAt)
+}
+
+func (s *Status) DNDEndTime_() float64 {
+	return float64(s.DNDEndTime)
+}
+
+func StatusListToJSON(u []*Status) ([]byte, error) {
+	list := make([]Status, len(u))
+	for i, s := range u {
+		list[i] = *s
+		list[i].ActiveChannel = ""
+	}
+	return json.Marshal(list)
+}
+
+func StatusMapToInterfaceMap(statusMap map[string]*Status) map[string]any {
+	interfaceMap := map[string]any{}
+	for _, s := range statusMap {
+		// Omitted statues mean offline
+		if s.Status != StatusOffline {
+			interfaceMap[s.UserId] = s.Status
+		}
+	}
+	return interfaceMap
+}