PLT-7503: Create Message Export Scheduled Task and CLI Command (#7612)

* Created message export scheduled task

* Added CLI command to immediately kick off an export job

* Added email addresses for users joining and leaving the channel to the export

* Added support for both MySQL and PostgreSQL

* Fixing gofmt error

* Added a new ChannelMemberHistory store and associated tests

* Updating the ChannelMemberHistory channel as users create/join/leave channels

* Added user email to the message export object so it can be included in the actiance export xml

* Don't fail to log a leave event if a corresponding join event wasn't logged

* Adding copyright notices

* Adding message export settings to daily diagnostics report

* Added System Console integration for message export

* Cleaned up TODOs

* Made batch size configurable

* Added export from timestamp to CLI command

* Made ChannelMemberHistory table updates best effort

* Added a context-based timeout option to the message export CLI

* Minor PR updates/improvements

* Removed unnecessary fields from MessageExport object to reduce query overhead

* Removed JSON functions from the message export query in an effort to optimize performance

* Changed the way that channel member history queries and purges work to better account for edge cases

* Fixing a test I missed with the last refactor

* Added file copy functionality to file backend, improved config validation, added default config values

* Fixed file copy tests

* More concise use of the testing libraries

* Fixed context leak error

* Changed default export path to correctly place an 'export' directory under the 'data' directory

* Can't delete records from a read replica

* Fixed copy file tests

* Start job workers when license is applied, if configured to do so

* Suggestions from the PR

* Moar unit tests

* Fixed test imports

5 files changed, 47 insertions, 1 deletions

diff --git a/utils/file_backend.go b/utils/file_backend.go
index 3469a63fb..c7a6c5591 100644
--- a/utils/file_backend.go
+++ b/utils/file_backend.go
@@ -13,6 +13,7 @@ type FileBackend interface {
 	TestConnection() *model.AppError
 
 	ReadFile(path string) ([]byte, *model.AppError)
+	CopyFile(oldPath, newPath string) *model.AppError
 	MoveFile(oldPath, newPath string) *model.AppError
 	WriteFile(f []byte, path string) *model.AppError
 	RemoveFile(path string) *model.AppError
diff --git a/utils/file_backend_local.go b/utils/file_backend_local.go
index b5e67f8f0..1367ccc1e 100644
--- a/utils/file_backend_local.go
+++ b/utils/file_backend_local.go
@@ -40,6 +40,13 @@ func (b *LocalFileBackend) ReadFile(path string) ([]byte, *model.AppError) {
 	}
 }
 
+func (b *LocalFileBackend) CopyFile(oldPath, newPath string) *model.AppError {
+	if err := CopyFile(filepath.Join(b.directory, oldPath), filepath.Join(b.directory, newPath)); err != nil {
+		return model.NewAppError("copyFile", "api.file.move_file.rename.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	return nil
+}
+
 func (b *LocalFileBackend) MoveFile(oldPath, newPath string) *model.AppError {
 	if err := os.MkdirAll(filepath.Dir(filepath.Join(b.directory, newPath)), 0774); err != nil {
 		return model.NewAppError("moveFile", "api.file.move_file.rename.app_error", nil, err.Error(), http.StatusInternalServerError)
diff --git a/utils/file_backend_s3.go b/utils/file_backend_s3.go
index ed88dc70c..5512b64dc 100644
--- a/utils/file_backend_s3.go
+++ b/utils/file_backend_s3.go
@@ -95,6 +95,23 @@ func (b *S3FileBackend) ReadFile(path string) ([]byte, *model.AppError) {
 	}
 }
 
+func (b *S3FileBackend) CopyFile(oldPath, newPath string) *model.AppError {
+	s3Clnt, err := b.s3New()
+	if err != nil {
+		return model.NewAppError("copyFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+
+	source := s3.NewSourceInfo(b.bucket, oldPath, nil)
+	destination, err := s3.NewDestinationInfo(b.bucket, newPath, nil, s3CopyMetadata(b.encrypt))
+	if err != nil {
+		return model.NewAppError("copyFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	if err = s3Clnt.CopyObject(destination, source); err != nil {
+		return model.NewAppError("copyFile", "api.file.move_file.copy_within_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
+	}
+	return nil
+}
+
 func (b *S3FileBackend) MoveFile(oldPath, newPath string) *model.AppError {
 	s3Clnt, err := b.s3New()
 	if err != nil {
@@ -107,7 +124,7 @@ func (b *S3FileBackend) MoveFile(oldPath, newPath string) *model.AppError {
 		return model.NewAppError("moveFile", "api.file.write_file.s3.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 	if err = s3Clnt.CopyObject(destination, source); err != nil {
-		return model.NewAppError("moveFile", "api.file.move_file.delete_from_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
+		return model.NewAppError("moveFile", "api.file.move_file.copy_within_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
 	}
 	if err = s3Clnt.RemoveObject(b.bucket, oldPath); err != nil {
 		return model.NewAppError("moveFile", "api.file.move_file.delete_from_s3.app_error", nil, err.Error(), http.StatusInternalServerError)
diff --git a/utils/file_backend_test.go b/utils/file_backend_test.go
index 0989f783c..098f86bbd 100644
--- a/utils/file_backend_test.go
+++ b/utils/file_backend_test.go
@@ -86,6 +86,26 @@ func (s *FileBackendTestSuite) TestReadWriteFile() {
 	s.EqualValues(readString, "test")
 }
 
+func (s *FileBackendTestSuite) TestCopyFile() {
+	b := []byte("test")
+	path1 := "tests/" + model.NewId()
+	path2 := "tests/" + model.NewId()
+
+	err := s.backend.WriteFile(b, path1)
+	s.Nil(err)
+	defer s.backend.RemoveFile(path1)
+
+	err = s.backend.CopyFile(path1, path2)
+	s.Nil(err)
+	defer s.backend.RemoveFile(path2)
+
+	_, err = s.backend.ReadFile(path1)
+	s.Nil(err)
+
+	_, err = s.backend.ReadFile(path2)
+	s.Nil(err)
+}
+
 func (s *FileBackendTestSuite) TestMoveFile() {
 	b := []byte("test")
 	path1 := "tests/" + model.NewId()
diff --git a/utils/license.go b/utils/license.go
index f4775d338..54bad45b5 100644
--- a/utils/license.go
+++ b/utils/license.go
@@ -228,6 +228,7 @@ func getClientLicense(l *model.License) map[string]string {
 		props["Company"] = l.Customer.Company
 		props["PhoneNumber"] = l.Customer.PhoneNumber
 		props["EmailNotificationContents"] = strconv.FormatBool(*l.Features.EmailNotificationContents)
+		props["MessageExport"] = strconv.FormatBool(*l.Features.MessageExport)
 	}
 
 	return props