[MM-54288] Support Packet V2 (#29403)

server/public/utils/fileutils.go

@@ -6,6 +6,8 @@ package utils
 import (
 	"os"
 	"path/filepath"
+	"regexp"
+	"strings"
 )
 
 func CommonBaseSearchPaths() []string {
@@ -111,3 +113,25 @@ func FindDirRelBinary(dir string) (string, bool) {
 	}
 	return found, true
 }
+
+// Valid characters are: alphanumeric, dash, underscore
+var safeFileNameRegex = regexp.MustCompile(`[^\w\-\_]`)
+
+// SanitizeFileName takes a string and returns a safe file name without an extension.
+func SanitizeFileName(input string) string {
+	// Trim leading or trailing dots or spaces
+	safeName := strings.Trim(input, ". ")
+	// Replace dots with nothing
+	safeName = strings.ReplaceAll(safeName, ".", "")
+
+	// Replace all invalid characters with an underscore
+	safeName = safeFileNameRegex.ReplaceAllString(safeName, "_")
+
+	// Limit length
+	const maxLength = 100
+	if len(safeName) > maxLength {
+		safeName = safeName[:maxLength]
+	}
+
+	return safeName
+}

server/public/utils/fileutils_test.go

@@ -7,12 +7,69 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
+func TestSanitizeFileName(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "normal characters",
+			input:    "normal-file_name",
+			expected: "normal-file_name",
+		},
+		{
+			name:     "special characters",
+			input:    "file*name@#$",
+			expected: "file_name___",
+		},
+		{
+			name:     "spaces",
+			input:    "my file name",
+			expected: "my_file_name",
+		},
+		{
+			name:     "leading/trailing dots and spaces",
+			input:    " .filename. ",
+			expected: "filename",
+		},
+		{
+			name:     "very long filename",
+			input:    strings.Repeat("a", 150) + ".txt",
+			expected: strings.Repeat("a", 100),
+		},
+		{
+			name:     "unicode characters",
+			input:    "résumé",
+			expected: "r_sum_",
+		},
+		{
+			name:     "german umlaute",
+			input:    "äëïöüß",
+			expected: "______",
+		},
+		{
+			name:     "empty string",
+			input:    "",
+			expected: "",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := SanitizeFileName(tt.input)
+			assert.Equal(t, tt.expected, result, tt.name)
+		})
+	}
+}
+
 func TestFindFile(t *testing.T) {
 	t.Run("files from various paths", func(t *testing.T) {
 		// Create the following directory structure:

server/public/utils/timeutils/time.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package timeutils
+
+import (
+	"time"
+)
+
+const (
+	RFC3339Milli = "2006-01-02T15:04:05.999Z07:00"
+)
+
+func FormatMillis(millis int64) string {
+	return time.UnixMilli(millis).Format(RFC3339Milli)
+}
+
+func ParseFormatedMillis(s string) (millis int64, err error) {
+	if s == "" {
+		return 0, nil
+	}
+
+	t, err := time.Parse(RFC3339Milli, s)
+	if err != nil {
+		return 0, err
+	}
+
+	return t.UnixMilli(), nil
+}

server/public/utils/timeutils/time_test.go

@@ -0,0 +1,57 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package timeutils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFormatMillis(t *testing.T) {
+	t.Run("zero time", func(t *testing.T) {
+		result := FormatMillis(0)
+		// The concrete time depends on the timezone, so we can't test the exact time
+		assert.Contains(t, result, "1970-01-01")
+		assert.Contains(t, result, "00:00")
+	})
+
+	t.Run("positive time", func(t *testing.T) {
+		result := FormatMillis(1609459200000) // 2021-01-01 00:00:00 UTC
+		assert.Contains(t, result, "2021-01-01")
+		assert.Contains(t, result, "00:00")
+	})
+
+	t.Run("negative time", func(t *testing.T) {
+		result := FormatMillis(-1609459200000) // 1919-01-01 00:00:00 UTC
+		assert.Contains(t, result, "1919-01-01")
+		assert.Contains(t, result, "00:00")
+	})
+}
+
+func TestParseFormatedMillis(t *testing.T) {
+	t.Run("empty string", func(t *testing.T) {
+		result, err := ParseFormatedMillis("")
+		assert.NoError(t, err)
+		assert.Equal(t, int64(0), result)
+	})
+
+	t.Run("valid timestamp", func(t *testing.T) {
+		result, err := ParseFormatedMillis("2021-01-01T00:00:00.000Z")
+		assert.NoError(t, err)
+		assert.Equal(t, int64(1609459200000), result)
+	})
+
+	t.Run("invalid format", func(t *testing.T) {
+		result, err := ParseFormatedMillis("2021-01-01")
+		assert.Error(t, err)
+		assert.Equal(t, int64(0), result)
+	})
+
+	t.Run("invalid date", func(t *testing.T) {
+		result, err := ParseFormatedMillis("2021-13-01T00:00:00.000Z")
+		assert.Error(t, err)
+		assert.Equal(t, int64(0), result)
+	})
+}