Added support for S3 storage classes (#28319)

* Added support for S3 storage classes

* Added missing translations for S3 storage class

* Changed default storage class values to preserve original behaviour

* Changed storage class description and example

* Fix translations ordering

* Change configuration defaults to empty strings

* Remove redundant empty string check

* Validate storage class variable against constants from S3 API docs

* Validate export storage class against constants

* Use slices for config validation

* Applied patch for translation ordering

server/public/model/config.go

@@ -15,6 +15,7 @@ import (
 	"path/filepath"
 	"reflect"
 	"regexp"
+	"slices"
 	"strconv"
 	"strings"
 	"time"
@@ -267,6 +268,19 @@ const (
 	LocalModeSocketPath = "/var/tmp/mattermost_local.socket"
 
 	ConnectedWorkspacesSettingsDefaultMaxPostsPerSync = 50 // a bit more than 4 typical screenfulls of posts
+
+	// These storage classes are the valid values for the x-amz-storage-class header. More documentation here https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html#AmazonS3-PutObject-request-header-StorageClass
+	StorageClassStandard           = "STANDARD"
+	StorageClassReducedRedundancy  = "REDUCED_REDUNDANCY"
+	StorageClassStandardIA         = "STANDARD_IA"
+	StorageClassOnezoneIA          = "ONEZONE_IA"
+	StorageClassIntelligentTiering = "INTELLIGENT_TIERING"
+	StorageClassGlacier            = "GLACIER"
+	StorageClassDeepArchive        = "DEEP_ARCHIVE"
+	StorageClassOutposts           = "OUTPOSTS"
+	StorageClassGlacierIR          = "GLACIER_IR"
+	StorageClassSnow               = "SNOW"
+	StorageClassExpressOnezone     = "EXPRESS_ONEZONE"
 )
 
 func GetDefaultAppCustomURLSchemes() []string {
@@ -1649,6 +1663,7 @@ type FileSettings struct {
 	AmazonS3Trace                      *bool   `access:"environment_file_storage,write_restrictable,cloud_restrictable"`
 	AmazonS3RequestTimeoutMilliseconds *int64  `access:"environment_file_storage,write_restrictable,cloud_restrictable"` // telemetry: none
 	AmazonS3UploadPartSizeBytes        *int64  `access:"environment_file_storage,write_restrictable,cloud_restrictable"` // telemetry: none
+	AmazonS3StorageClass               *string `access:"environment_file_storage,write_restrictable,cloud_restrictable"` // telemetry: none
 	// Export store settings
 	DedicatedExportStore                     *bool   `access:"environment_file_storage,write_restrictable"`
 	ExportDriverName                         *string `access:"environment_file_storage,write_restrictable"`
@@ -1666,6 +1681,7 @@ type FileSettings struct {
 	ExportAmazonS3RequestTimeoutMilliseconds *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
 	ExportAmazonS3PresignExpiresSeconds      *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
 	ExportAmazonS3UploadPartSizeBytes        *int64  `access:"environment_file_storage,write_restrictable"` // telemetry: none
+	ExportAmazonS3StorageClass               *string `access:"environment_file_storage,write_restrictable"` // telemetry: none
 }
 
 func (s *FileSettings) SetDefaults(isUpdate bool) {
@@ -1778,6 +1794,10 @@ func (s *FileSettings) SetDefaults(isUpdate bool) {
 		s.AmazonS3UploadPartSizeBytes = NewPointer(int64(FileSettingsDefaultS3UploadPartSizeBytes))
 	}
 
+	if s.AmazonS3StorageClass == nil {
+		s.AmazonS3StorageClass = NewPointer("")
+	}
+
 	if s.DedicatedExportStore == nil {
 		s.DedicatedExportStore = NewPointer(false)
 	}
@@ -1843,6 +1863,10 @@ func (s *FileSettings) SetDefaults(isUpdate bool) {
 	if s.ExportAmazonS3UploadPartSizeBytes == nil {
 		s.ExportAmazonS3UploadPartSizeBytes = NewPointer(int64(FileSettingsDefaultS3ExportUploadPartSizeBytes))
 	}
+
+	if s.ExportAmazonS3StorageClass == nil {
+		s.ExportAmazonS3StorageClass = NewPointer("")
+	}
 }
 
 type EmailSettings struct {
@@ -3958,6 +3982,14 @@ func (s *FileSettings) isValid() *AppError {
 		return NewAppError("Config.IsValid", "model.config.is_valid.amazons3_timeout.app_error", map[string]any{"Value": *s.MaxImageDecoderConcurrency}, "", http.StatusBadRequest)
 	}
 
+	if *s.AmazonS3StorageClass != "" && !slices.Contains([]string{StorageClassStandard, StorageClassReducedRedundancy, StorageClassStandardIA, StorageClassOnezoneIA, StorageClassIntelligentTiering, StorageClassGlacier, StorageClassDeepArchive, StorageClassOutposts, StorageClassGlacierIR, StorageClassSnow, StorageClassExpressOnezone}, *s.AmazonS3StorageClass) {
+		return NewAppError("Config.IsValid", "model.config.is_valid.storage_class.app_error", map[string]any{"Value": *s.AmazonS3StorageClass}, "", http.StatusBadRequest)
+	}
+
+	if *s.ExportAmazonS3StorageClass != "" && !slices.Contains([]string{StorageClassStandard, StorageClassReducedRedundancy, StorageClassStandardIA, StorageClassOnezoneIA, StorageClassIntelligentTiering, StorageClassGlacier, StorageClassDeepArchive, StorageClassOutposts, StorageClassGlacierIR, StorageClassSnow, StorageClassExpressOnezone}, *s.ExportAmazonS3StorageClass) {
+		return NewAppError("Config.IsValid", "model.config.is_valid.storage_class.app_error", map[string]any{"Value": *s.ExportAmazonS3StorageClass}, "", http.StatusBadRequest)
+	}
+
 	return nil
 }