Add new functionality to download logs (#917)

web/routes.go

@@ -3,6 +3,7 @@ package web
 import (
 	"bufio"
 	"context"
+	"compress/gzip"
 	"encoding/json"
 	"fmt"
 	"html/template"
@@ -55,6 +56,7 @@ func createRouter(h *handler) *mux.Router {
 	}
 	s := r.PathPrefix(base).Subrouter()
 	s.HandleFunc("/api/logs/stream", h.streamLogs)
+	s.HandleFunc("/api/logs/download", h.downloadLogs)
 	s.HandleFunc("/api/logs", h.fetchLogsBetweenDates)
 	s.HandleFunc("/api/events/stream", h.streamEvents)
 	s.HandleFunc("/version", h.version)
@@ -117,6 +119,33 @@ func (h *handler) fetchLogsBetweenDates(w http.ResponseWriter, r *http.Request)
 	io.Copy(w, reader)
 }
 
+func (h *handler) downloadLogs(w http.ResponseWriter, r *http.Request) {
+	id := r.URL.Query().Get("id")
+	container, err := h.client.FindContainer(id)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+
+	now := time.Now()
+	from := time.Unix(container.Created, 0)
+
+	w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%v.log.gz", container.ID))
+	w.Header().Set("Content-Type", "application/octet-stream")
+	zw := gzip.NewWriter(w)
+	defer zw.Close()
+	zw.Name = fmt.Sprintf("%v.log", container.ID)
+	zw.Comment = "Logs generated by Dozzle"
+	zw.ModTime = now
+
+	reader, err := h.client.ContainerLogsBetweenDates(r.Context(), container.ID, from, now)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	io.Copy(zw, reader)
+}
+
 func (h *handler) streamLogs(w http.ResponseWriter, r *http.Request) {
 	id := r.URL.Query().Get("id")
 	if id == "" {