Feature/audit certificate upload (#30223)

* feat: Add certificate upload option for audit logging settings

* Commit current changes

* Additions

* MM-62944 Fix fileupload settings not being clickable

* Support for uploading a cert for experimental audit logging cert. Pre cloud implementation in the backend

* Forgot to add new hook

* Add support for setting custom audit log certifcates in Cloud

* Permissions

* I18n

* Change order

* Linter fixes

* Linter fixes, add openapi spec

* additions for openapi

* More openapi fixes because it won't run locally

* Undo, cursor went rogue

* newline fix

* Align types properly

* Fix i18n

* Fix i18n AGAIN

* Fix error

* Update api/v4/source/audit_logging.yaml

---------

Co-authored-by: Harrison Healey <harrisonmhealey@gmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/audit.go

@@ -7,6 +7,8 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"io"
+	"mime/multipart"
 	"net/http"
 	"os"
 	"os/user"
@@ -28,6 +30,10 @@ var (
 	LevelCLI     = mlog.LvlAuditCLI
 )
 
+const (
+	AuditCertificateFilename = "audit_certificate.pem"
+)
+
 func (a *App) GetAudits(rctx request.CTX, userID string, limit int) (model.Audits, *model.AppError) {
 	audits, err := a.Srv().Store().Audit().Get(userID, 0, limit)
 	if err != nil {
@@ -156,3 +162,66 @@ func (s *Server) onAuditTargetQueueFull(qname string, maxQSize int) bool {
 func (s *Server) onAuditError(err error) {
 	s.Log().Error("Audit Error", mlog.Err(err))
 }
+
+func (a *App) AddAuditLogCertificate(rctx request.CTX, fileData *multipart.FileHeader) *model.AppError {
+	file, err := fileData.Open()
+	if err != nil {
+		return model.NewAppError("AddAuditLogCertificate", "api.admin.add_certificate.open.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+	defer file.Close()
+
+	data, err := io.ReadAll(file)
+	if err != nil {
+		return model.NewAppError("AddAuditLogCertificate", "api.admin.add_certificate.saving.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	err = a.Srv().platform.SetConfigFile(AuditCertificateFilename, data)
+	if err != nil {
+		return model.NewAppError("AddAuditLogCertificate", "api.admin.add_certificate.saving.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	cfg := a.Config().Clone()
+
+	*cfg.ExperimentalAuditSettings.Certificate = AuditCertificateFilename
+
+	if err := cfg.IsValid(); err != nil {
+		return err
+	}
+
+	a.UpdateConfig(func(dest *model.Config) { *dest = *cfg })
+
+	if a.License().IsCloud() {
+		err = a.Cloud().CreateAuditLoggingCert(rctx.Session().UserId, fileData)
+		if err != nil {
+			return model.NewAppError("AddAuditLogCertificate", "api.admin.add_certificate.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+		}
+	}
+
+	return nil
+}
+
+func (a *App) RemoveAuditLogCertificate(rctx request.CTX) *model.AppError {
+	err := a.Srv().platform.RemoveConfigFile(AuditCertificateFilename)
+	if err != nil {
+		return model.NewAppError("RemoveAuditLogCertificate", "api.admin.remove_certificate.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	cfg := a.Config().Clone()
+
+	*cfg.ExperimentalAuditSettings.Certificate = ""
+
+	if err := cfg.IsValid(); err != nil {
+		return model.NewAppError("RemoveAuditLogCertificate", "api.admin.remove_certificate.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+	}
+
+	a.UpdateConfig(func(dest *model.Config) { *dest = *cfg })
+
+	if a.License().IsCloud() {
+		err = a.Cloud().RemoveAuditLoggingCert(rctx.Session().UserId)
+		if err != nil {
+			return model.NewAppError("RemoveAuditLogCertificate", "api.admin.remove_certificate.app_error", nil, "", http.StatusInternalServerError).Wrap(err)
+		}
+	}
+
+	return nil
+}