From d5ea2aa824eee4b7e2d169d21da0107d057e7bc6 Mon Sep 17 00:00:00 2001
From: Bobby <30593201+luciferreeves@users.noreply.github.com>
Date: Wed, 24 Dec 2025 17:17:15 +0530
Subject: feat: Implement API endpoints for email details and actions, and
 refactor email preview for client-side rendering with Shadow DOM.

---
 utils/format/date.go |  5 -----
 utils/format/html.go | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 utils/format/size.go | 16 ++++++++++++++
 3 files changed, 75 insertions(+), 5 deletions(-)
 create mode 100644 utils/format/size.go

(limited to 'utils/format')

diff --git a/utils/format/date.go b/utils/format/date.go
index 8ef95cb..a326fa0 100644
--- a/utils/format/date.go
+++ b/utils/format/date.go
@@ -1,7 +1,6 @@
 package format
 
 import (
-	"html"
 	"lain/types"
 	"time"
 )
@@ -93,7 +92,3 @@ func formatTime(date time.Time, timeFormat types.TimeFormat) string {
 		return date.Format("15:04")
 	}
 }
-
-func DecodeHTML(text string) string {
-	return html.UnescapeString(text)
-}
diff --git a/utils/format/html.go b/utils/format/html.go
index 36e2425..d976cb8 100644
--- a/utils/format/html.go
+++ b/utils/format/html.go
@@ -1,10 +1,65 @@
 package format
 
 import (
+	"html"
 	"regexp"
 	"strings"
 )
 
+func SanitizeHTML(htmlContent string) string {
+	// Remove dangerous tags
+	htmlContent = removeDangerousTags(htmlContent)
+
+	// Remove inline event handlers
+	htmlContent = removeEventHandlers(htmlContent)
+
+	// Remove javascript: protocol
+	htmlContent = removeJavascriptProtocol(htmlContent)
+
+	// Sanitize styles
+	htmlContent = sanitizeStyles(htmlContent)
+
+	return htmlContent
+}
+
+func removeDangerousTags(html string) string {
+	dangerousTags := []string{
+		"script", "iframe", "object", "embed", "applet",
+		"meta", "link", "base", "form", "input", "button",
+	}
+
+	for _, tag := range dangerousTags {
+		regex := regexp.MustCompile(`(?i)<` + tag + `[^>]*>[\s\S]*?</` + tag + `>`)
+		html = regex.ReplaceAllString(html, "")
+		regex = regexp.MustCompile(`(?i)<` + tag + `[^>]*>`)
+		html = regex.ReplaceAllString(html, "")
+	}
+
+	return html
+}
+
+func removeEventHandlers(html string) string {
+	eventHandlers := regexp.MustCompile(`(?i)\s*on\w+\s*=\s*["'][^"']*["']`)
+	return eventHandlers.ReplaceAllString(html, "")
+}
+
+func removeJavascriptProtocol(html string) string {
+	jsProtocol := regexp.MustCompile(`(?i)javascript:`)
+	return jsProtocol.ReplaceAllString(html, "")
+}
+
+func sanitizeStyles(html string) string {
+	// Remove dangerous CSS properties
+	dangerousStyles := []string{"behavior", "expression", "binding", "import", "moz-binding"}
+
+	for _, style := range dangerousStyles {
+		regex := regexp.MustCompile(`(?i)` + style + `\s*:\s*[^;]+;?`)
+		html = regex.ReplaceAllString(html, "")
+	}
+
+	return html
+}
+
 func GenerateSnippet(bodyText, bodyHTML string) string {
 	text := bodyText
 	if text == "" && bodyHTML != "" {
@@ -71,3 +126,7 @@ func StripHTML(html string) string {
 
 	return strings.TrimSpace(strings.Join(cleanLines, " "))
 }
+
+func DecodeHTML(text string) string {
+	return html.UnescapeString(text)
+}
diff --git a/utils/format/size.go b/utils/format/size.go
new file mode 100644
index 0000000..ce7c4fa
--- /dev/null
+++ b/utils/format/size.go
@@ -0,0 +1,16 @@
+package format
+
+import "fmt"
+
+func FormatFileSize(bytes int64) string {
+	const unit = 1024
+	if bytes < unit {
+		return fmt.Sprintf("%d B", bytes)
+	}
+	div, exp := int64(unit), 0
+	for n := bytes / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+	return fmt.Sprintf("%.1f %cB", float64(bytes)/float64(div), "KMGTPE"[exp])
+}
-- 
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