feat: add max upload size setting to UI & UI improvements (#1646)

* Add preliminar Windows support for both
development and production environments.

Default profile.Data will be set to "C:\ProgramData\memos" on Windows.
Folder will be created if it does not exist, as this behavior is
expected for Windows applications.

System service installation can be achieved with third-party tools,
explained in docs/windows-service.md.

Not sure if it's worth using https://github.com/kardianos/service
to make service support built-in.

This could be a nice addition alongside #1583 (add Windows artifacts)

* feat: improve Windows support

- Fix local file storage path handling on Windows

- Improve Windows dev script

* feat: add max upload size setting to UI & more

- feat: add max upload size setting to UI

- feat: max upload size setting is checked on UI during upload,
but also enforced by the server

- fix: overflowing mobile layout for Create SSO, Create Storage
and other Settings dialogs

- feat: add HelpButton component with some links to docs were appropriate

- remove LearnMore component in favor of HelpButton

- refactor: change some if/else to switch statements

- refactor: inline some err == nil checks

! Existing databases without the new setting 'max-upload-size-mib'
will show an upload error, but this can be user-fixed by simply
setting the value on system settings UI.

* improvements requested by @boojack

server/resource.go

@@ -25,8 +25,11 @@ import (
 )
 
 const (
-	// The max file size is 32MB.
-	maxFileSize = 32 << 20
+	// The upload memory buffer is 32 MiB.
+	// It should be kept low, so RAM usage doesn't get out of control.
+	// This is unrelated to maximum upload size limit, which is now set through system setting.
+	maxUploadBufferSizeBytes = 32 << 20
+	MebiByte                 = 1024 * 1024
 )
 
 var fileKeyPattern = regexp.MustCompile(`\{[a-z]{1,9}\}`)
@@ -67,8 +70,13 @@ func (s *Server) registerResourceRoutes(g *echo.Group) {
 			return echo.NewHTTPError(http.StatusUnauthorized, "Missing user in session")
 		}
 
-		if err := c.Request().ParseMultipartForm(maxFileSize); err != nil {
-			return echo.NewHTTPError(http.StatusBadRequest, "Upload file overload max size").SetInternal(err)
+		maxUploadSetting := s.Store.GetSystemSettingValueOrDefault(&ctx, api.SystemSettingMaxUploadSizeMiBName, "0")
+		var settingMaxUploadSizeBytes int
+		if settingMaxUploadSizeMiB, err := strconv.Atoi(maxUploadSetting); err == nil {
+			settingMaxUploadSizeBytes = settingMaxUploadSizeMiB * MebiByte
+		} else {
+			log.Warn("Failed to parse max upload size", zap.Error(err))
+			settingMaxUploadSizeBytes = 0
 		}
 
 		file, err := c.FormFile("file")
@@ -79,6 +87,14 @@ func (s *Server) registerResourceRoutes(g *echo.Group) {
 			return echo.NewHTTPError(http.StatusBadRequest, "Upload file not found").SetInternal(err)
 		}
 
+		if file.Size > int64(settingMaxUploadSizeBytes) {
+			message := fmt.Sprintf("File size exceeds allowed limit of %d MiB", settingMaxUploadSizeBytes/MebiByte)
+			return echo.NewHTTPError(http.StatusBadRequest, message).SetInternal(err)
+		}
+		if err := c.Request().ParseMultipartForm(maxUploadBufferSizeBytes); err != nil {
+			return echo.NewHTTPError(http.StatusBadRequest, "Failed to parse upload data").SetInternal(err)
+		}
+
 		filetype := file.Header.Get("Content-Type")
 		size := file.Size
 		sourceFile, err := file.Open()