feat(backup): Add backup/restore to the server

api/http/handler/backup/restore.go

@@ -0,0 +1,69 @@
+package backup
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+
+	"github.com/pkg/errors"
+	httperror "github.com/portainer/libhttp/error"
+	"github.com/portainer/libhttp/request"
+	operations "github.com/portainer/portainer/api/backup"
+)
+
+type restorePayload struct {
+	FileContent []byte
+	FileName    string
+	Password    string
+}
+
+// @id Restore
+// @summary Triggers a system restore using provided backup file
+// @description Triggers a system restore using provided backup file
+// @description **Access policy**: public
+// @tags backup
+// @param FileContent body []byte true "Content of the backup"
+// @param FileName body string true "File name"
+// @param Password body string false "Password to decrypt the backup with"
+// @success 200  "Success"
+// @failure 400 "Invalid request"
+// @failure 500 "Server error"
+// @router /restore [post]
+func (h *Handler) restore(w http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	initialized, err := h.adminMonitor.WasInitialized()
+	if err != nil {
+		return &httperror.HandlerError{StatusCode: http.StatusInternalServerError, Message: "Failed to check system initialization", Err: err}
+	}
+	if initialized {
+		return &httperror.HandlerError{StatusCode: http.StatusBadRequest, Message: "Cannot restore already initialized instance", Err: errors.New("system already initialized")}
+	}
+	h.adminMonitor.Stop()
+	defer h.adminMonitor.Start()
+
+	var payload restorePayload
+	err = decodeForm(r, &payload)
+	if err != nil {
+		return &httperror.HandlerError{StatusCode: http.StatusBadRequest, Message: "Invalid request payload", Err: err}
+	}
+
+	var archiveReader io.Reader = bytes.NewReader(payload.FileContent)
+	err = operations.RestoreArchive(archiveReader, payload.Password, h.filestorePath, h.gate, h.dataStore, h.shutdownTrigger)
+	if err != nil {
+		return &httperror.HandlerError{StatusCode: http.StatusInternalServerError, Message: "Failed to restore the backup", Err: err}
+	}
+
+	return nil
+}
+
+func decodeForm(r *http.Request, p *restorePayload) error {
+	content, name, err := request.RetrieveMultiPartFormFile(r, "file")
+	if err != nil {
+		return err
+	}
+	p.FileContent = content
+	p.FileName = name
+
+	password, _ := request.RetrieveMultiPartFormValue(r, "password", true)
+	p.Password = password
+	return nil
+}