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/plugin_kvset_options.go

@@ -0,0 +1,47 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+import (
+	"net/http"
+)
+
+// PluginKVSetOptions contains information on how to store a value in the plugin KV store.
+type PluginKVSetOptions struct {
+	Atomic          bool   // Only store the value if the current value matches the oldValue
+	OldValue        []byte // The value to compare with the current value. Only used when Atomic is true
+	ExpireInSeconds int64  // Set an expire counter
+}
+
+// IsValid returns nil if the chosen options are valid.
+func (opt *PluginKVSetOptions) IsValid() *AppError {
+	if !opt.Atomic && opt.OldValue != nil {
+		return NewAppError(
+			"PluginKVSetOptions.IsValid",
+			"model.plugin_kvset_options.is_valid.old_value.app_error",
+			nil,
+			"",
+			http.StatusBadRequest,
+		)
+	}
+
+	return nil
+}
+
+// NewPluginKeyValueFromOptions return a PluginKeyValue given a pluginID, a KV pair and options.
+func NewPluginKeyValueFromOptions(pluginId, key string, value []byte, opt PluginKVSetOptions) (*PluginKeyValue, *AppError) {
+	expireAt := int64(0)
+	if opt.ExpireInSeconds != 0 {
+		expireAt = GetMillis() + (opt.ExpireInSeconds * 1000)
+	}
+
+	kv := &PluginKeyValue{
+		PluginId: pluginId,
+		Key:      key,
+		Value:    value,
+		ExpireAt: expireAt,
+	}
+
+	return kv, nil
+}