From a75a5c2297df4eb89235a54efd38d9539b7c15e5 Mon Sep 17 00:00:00 2001
From: Gareth <garethgeorge97@gmail.com>
Date: Sun, 5 May 2024 04:11:23 -0700
Subject: [PATCH] feat: add download link to create a zip archive of restored
 files

---
 backrest.go                                |  1 +
 internal/api/downloadhandler.go            | 84 ++++++++++++++++++++++
 internal/orchestrator/tasks/taskrestore.go |  7 +-
 webui/src/components/OperationRow.tsx      |  4 ++
 4 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 internal/api/downloadhandler.go

diff --git a/backrest.go b/backrest.go
index 773b5e8..2bed367 100644
--- a/backrest.go
+++ b/backrest.go
@@ -108,6 +108,7 @@ func main() {
 	backrestHandlerPath, backrestHandler := v1connect.NewBackrestHandler(apiBackrestHandler)
 	mux.Handle(backrestHandlerPath, auth.RequireAuthentication(backrestHandler, authenticator))
 	mux.Handle("/", webui.Handler())
+	mux.Handle("/download/", http.StripPrefix("/download", api.NewDownloadHandler(oplog)))
 
 	// Serve the HTTP gateway
 	server := &http.Server{
diff --git a/internal/api/downloadhandler.go b/internal/api/downloadhandler.go
new file mode 100644
index 0000000..b28860e
--- /dev/null
+++ b/internal/api/downloadhandler.go
@@ -0,0 +1,84 @@
+package api
+
+import (
+	"archive/zip"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	v1 "github.com/garethgeorge/backrest/gen/go/v1"
+	"github.com/garethgeorge/backrest/internal/oplog"
+	"go.uber.org/zap"
+)
+
+func NewDownloadHandler(oplog *oplog.OpLog) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		p := r.URL.Path[1:]
+		sep := strings.Index(p, "/")
+		if sep == -1 {
+			http.Error(w, "invalid path", http.StatusBadRequest)
+			return
+		}
+		restoreID := p[:sep]
+		filePath := p[sep+1:]
+		opID, err := strconv.ParseInt(restoreID, 16, 64)
+		if err != nil {
+			http.Error(w, "invalid restore ID: "+err.Error(), http.StatusBadRequest)
+			return
+		}
+		op, err := oplog.Get(int64(opID))
+		if err != nil {
+			http.Error(w, "restore not found", http.StatusNotFound)
+			return
+		}
+		restoreOp, ok := op.Op.(*v1.Operation_OperationRestore)
+		if !ok {
+			http.Error(w, "restore not found", http.StatusNotFound)
+			return
+		}
+		targetPath := restoreOp.OperationRestore.GetTarget()
+		if targetPath == "" {
+			http.Error(w, "restore target not found", http.StatusNotFound)
+			return
+		}
+		fullPath := filepath.Join(targetPath, filePath)
+
+		w.Header().Set("Content-Disposition", "attachment; filename=archive.zip")
+		w.Header().Set("Content-Type", "application/zip")
+		w.Header().Set("Content-Transfer-Encoding", "binary")
+
+		z := zip.NewWriter(w)
+		zap.L().Info("creating zip archive", zap.String("path", fullPath))
+		if err := filepath.Walk(fullPath, func(path string, info os.FileInfo, err error) error {
+			if err != nil {
+				return err
+			}
+			if info.IsDir() {
+				return nil
+			}
+			file, err := os.OpenFile(path, os.O_RDONLY, 0)
+			if err != nil {
+				zap.L().Warn("error opening file", zap.String("path", path), zap.Error(err))
+				return nil
+			}
+			defer file.Close()
+			f, err := z.Create(path[len(fullPath)+1:])
+			if err != nil {
+				return fmt.Errorf("add file to zip archive: %w", err)
+			}
+			io.Copy(f, file)
+			return nil
+		}); err != nil {
+			zap.S().Errorf("error creating zip archive: %v", err)
+			http.Error(w, "error creating zip archive", http.StatusInternalServerError)
+		}
+		if err := z.Close(); err != nil {
+			zap.S().Errorf("error closing zip archive: %v", err)
+			http.Error(w, "error closing zip archive", http.StatusInternalServerError)
+		}
+	})
+}
diff --git a/internal/orchestrator/tasks/taskrestore.go b/internal/orchestrator/tasks/taskrestore.go
index 7021cd0..9be2c58 100644
--- a/internal/orchestrator/tasks/taskrestore.go
+++ b/internal/orchestrator/tasks/taskrestore.go
@@ -24,7 +24,12 @@ func NewOneoffRestoreTask(repoID, planID string, flowID int64, at time.Time, sna
 			RunAt:  at,
 			ProtoOp: &v1.Operation{
 				SnapshotId: snapshotID,
-				Op:         &v1.Operation_OperationRestore{},
+				Op: &v1.Operation_OperationRestore{
+					OperationRestore: &v1.OperationRestore{
+						Path:   path,
+						Target: target,
+					},
+				},
 			},
 		},
 		Do: func(ctx context.Context, st ScheduledTask, taskRunner TaskRunner) error {
diff --git a/webui/src/components/OperationRow.tsx b/webui/src/components/OperationRow.tsx
index b845c53..9e42996 100644
--- a/webui/src/components/OperationRow.tsx
+++ b/webui/src/components/OperationRow.tsx
@@ -194,6 +194,10 @@ export const OperationRow = ({
         {details.percentage !== undefined ? (
           <Progress percent={details.percentage || 0} status="active" />
         ) : null}
+        {operation.status == OperationStatus.STATUS_SUCCESS ? (<>
+          <br />
+          <Button type="link" href={"/download/" + operation.id.toString(16) + '/'} target="_blank">Download File(s)</Button>
+        </>) : null}
       </>
     );
   } else if (operation.op.case === "operationRunHook") {