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/terms_of_service.go

@@ -0,0 +1,54 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"fmt"
+	"net/http"
+	"unicode/utf8"
+)
+
+type TermsOfService struct {
+	Id       string `json:"id"`
+	CreateAt int64  `json:"create_at"`
+	UserId   string `json:"user_id"`
+	Text     string `json:"text"`
+}
+
+func (t *TermsOfService) IsValid() *AppError {
+	if !IsValidId(t.Id) {
+		return InvalidTermsOfServiceError("id", "")
+	}
+
+	if t.CreateAt == 0 {
+		return InvalidTermsOfServiceError("create_at", t.Id)
+	}
+
+	if !IsValidId(t.UserId) {
+		return InvalidTermsOfServiceError("user_id", t.Id)
+	}
+
+	if utf8.RuneCountInString(t.Text) > PostMessageMaxRunesV2 {
+		return InvalidTermsOfServiceError("text", t.Id)
+	}
+
+	return nil
+}
+
+func InvalidTermsOfServiceError(fieldName string, termsOfServiceId string) *AppError {
+	id := fmt.Sprintf("model.terms_of_service.is_valid.%s.app_error", fieldName)
+	details := ""
+	if termsOfServiceId != "" {
+		details = "terms_of_service_id=" + termsOfServiceId
+	}
+	return NewAppError("TermsOfService.IsValid", id, map[string]any{"MaxLength": PostMessageMaxRunesV2}, details, http.StatusBadRequest)
+}
+
+func (t *TermsOfService) PreSave() {
+	if t.Id == "" {
+		t.Id = NewId()
+	}
+
+	t.CreateAt = GetMillis()
+}