feat(logs): make log files downloadable (#706)

* feat(logs): show and download log files

* feat(logs): make logs settings dropdown

* feat(logs): minor cosmetic changes

* fix(logs): send empty response when lohpath not configured

* fix(logs): remove unused imports

* feat(logs): check if logs dir exists

* feat(logs): list log files in settings

internal/http/logs.go

@@ -0,0 +1,141 @@
+package http
+
+import (
+	"io/fs"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/autobrr/autobrr/internal/config"
+
+	"github.com/dustin/go-humanize"
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/render"
+)
+
+type logsHandler struct {
+	cfg *config.AppConfig
+}
+
+func newLogsHandler(cfg *config.AppConfig) *logsHandler {
+	return &logsHandler{cfg: cfg}
+}
+
+func (h logsHandler) Routes(r chi.Router) {
+	r.Get("/files", h.files)
+	r.Get("/files/{logFile}", h.downloadFile)
+}
+
+func (h logsHandler) files(w http.ResponseWriter, r *http.Request) {
+	response := LogfilesResponse{
+		Files: []logFile{},
+		Count: 0,
+	}
+
+	if h.cfg.Config.LogPath == "" {
+		render.JSON(w, r, response)
+		return
+	}
+
+	logsDir := path.Dir(h.cfg.Config.LogPath)
+
+	// check if dir exists before walkDir
+	if _, err := os.Stat(logsDir); os.IsNotExist(err) {
+		render.JSON(w, r, response)
+		return
+	}
+
+	var walk = func(path string, d fs.DirEntry, err error) error {
+		if d.IsDir() {
+			return nil
+		}
+
+		if filepath.Ext(path) == ".log" {
+			i, err := d.Info()
+			if err != nil {
+				return err
+			}
+
+			response.Files = append(response.Files, logFile{
+				Name:      d.Name(),
+				SizeBytes: i.Size(),
+				Size:      humanize.Bytes(uint64(i.Size())),
+				UpdatedAt: i.ModTime(),
+			})
+		}
+
+		return nil
+	}
+
+	if err := filepath.WalkDir(logsDir, walk); err != nil {
+		render.Status(r, http.StatusInternalServerError)
+		render.JSON(w, r, errorResponse{
+			Message: err.Error(),
+			Status:  http.StatusInternalServerError,
+		})
+		return
+	}
+
+	response.Count = len(response.Files)
+
+	render.JSON(w, r, response)
+}
+
+func (h logsHandler) downloadFile(w http.ResponseWriter, r *http.Request) {
+	if h.cfg.Config.LogPath == "" {
+		render.Status(r, http.StatusNotFound)
+		return
+	}
+
+	logsDir := path.Dir(h.cfg.Config.LogPath)
+
+	// check if dir exists before walkDir
+	if _, err := os.Stat(logsDir); os.IsNotExist(err) {
+		render.Status(r, http.StatusNotFound)
+		render.JSON(w, r, errorResponse{
+			Message: "log directory not found or inaccessible",
+			Status:  http.StatusNotFound,
+		})
+		return
+	}
+
+	logFile := chi.URLParam(r, "logFile")
+	if logFile == "" {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, errorResponse{
+			Message: "empty log file",
+			Status:  http.StatusBadRequest,
+		})
+		return
+	} else if !strings.Contains(logFile, ".log") {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, errorResponse{
+			Message: "invalid file",
+			Status:  http.StatusBadRequest,
+		})
+		return
+	}
+
+	w.Header().Set("Content-Disposition", "attachment; filename="+strconv.Quote(logFile))
+	w.Header().Set("Content-Type", "application/octet-stream")
+
+	filePath := filepath.Join(logsDir, logFile)
+
+	http.ServeFile(w, r, filePath)
+}
+
+type logFile struct {
+	Name      string    `json:"filename"`
+	SizeBytes int64     `json:"size_bytes"`
+	Size      string    `json:"size"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type LogfilesResponse struct {
+	Files []logFile `json:"files"`
+	Count int       `json:"count"`
+}