From 0f7874b429868a27a5442187c29e128c068321a6 Mon Sep 17 00:00:00 2001
From: Patrick Britton <admin@pbritton.dev>
Date: Mon, 9 Feb 2026 08:58:56 -0600
Subject: [PATCH] fix: unescape HTML entities in OG tag parsing for link
 previews

---
 fix_entities.sql                                  | 15 +++++++++++++++
 .../internal/services/link_preview_service.go     | 11 ++++++-----
 2 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100644 fix_entities.sql

diff --git a/fix_entities.sql b/fix_entities.sql
new file mode 100644
index 0000000..9b0a922
--- /dev/null
+++ b/fix_entities.sql
@@ -0,0 +1,15 @@
+-- Fix HTML entities in link preview titles
+UPDATE posts SET link_preview_title = REPLACE(link_preview_title, '&#039;', '''') WHERE link_preview_title LIKE '%&#039;%';
+UPDATE posts SET link_preview_title = REPLACE(link_preview_title, '&amp;', '&') WHERE link_preview_title LIKE '%&amp;%';
+UPDATE posts SET link_preview_title = REPLACE(link_preview_title, '&quot;', '"') WHERE link_preview_title LIKE '%&quot;%';
+
+-- Fix HTML entities in link preview descriptions
+UPDATE posts SET link_preview_description = REPLACE(link_preview_description, '&#039;', '''') WHERE link_preview_description LIKE '%&#039;%';
+UPDATE posts SET link_preview_description = REPLACE(link_preview_description, '&amp;', '&') WHERE link_preview_description LIKE '%&amp;%';
+UPDATE posts SET link_preview_description = REPLACE(link_preview_description, '&quot;', '"') WHERE link_preview_description LIKE '%&quot;%';
+
+-- Fix HTML entities in article titles/descriptions
+UPDATE official_account_articles SET title = REPLACE(title, '&#039;', '''') WHERE title LIKE '%&#039;%';
+UPDATE official_account_articles SET title = REPLACE(title, '&amp;', '&') WHERE title LIKE '%&amp;%';
+UPDATE official_account_articles SET description = REPLACE(description, '&#039;', '''') WHERE description LIKE '%&#039;%';
+UPDATE official_account_articles SET description = REPLACE(description, '&amp;', '&') WHERE description LIKE '%&amp;%';
diff --git a/go-backend/internal/services/link_preview_service.go b/go-backend/internal/services/link_preview_service.go
index 5409b0a..0727944 100644
--- a/go-backend/internal/services/link_preview_service.go
+++ b/go-backend/internal/services/link_preview_service.go
@@ -3,6 +3,7 @@ package services
 import (
 	"context"
 	"fmt"
+	"html"
 	"io"
 	"net"
 	"net/http"
@@ -182,19 +183,19 @@ func (s *LinkPreviewService) validateURL(u *url.URL) error {
 }
 
 // parseOGTags extracts OpenGraph meta tags from raw HTML.
-func (s *LinkPreviewService) parseOGTags(html string, sourceURL string) *LinkPreview {
+func (s *LinkPreviewService) parseOGTags(htmlStr string, sourceURL string) *LinkPreview {
 	preview := &LinkPreview{}
 
 	// Use regex to extract meta tags — lightweight, no dependency needed
 	metaRe := regexp.MustCompile(`(?i)<meta\s+[^>]*>`)
-	metas := metaRe.FindAllString(html, -1)
+	metas := metaRe.FindAllString(htmlStr, -1)
 
 	for _, tag := range metas {
 		prop := extractAttr(tag, "property")
 		if prop == "" {
 			prop = extractAttr(tag, "name")
 		}
-		content := extractAttr(tag, "content")
+		content := html.UnescapeString(extractAttr(tag, "content"))
 		if content == "" {
 			continue
 		}
@@ -227,8 +228,8 @@ func (s *LinkPreviewService) parseOGTags(html string, sourceURL string) *LinkPre
 	// Fallback: try <title> tag if no og:title
 	if preview.Title == "" {
 		titleRe := regexp.MustCompile(`(?i)<title[^>]*>(.*?)</title>`)
-		if m := titleRe.FindStringSubmatch(html); len(m) > 1 {
-			preview.Title = strings.TrimSpace(m[1])
+		if m := titleRe.FindStringSubmatch(htmlStr); len(m) > 1 {
+			preview.Title = html.UnescapeString(strings.TrimSpace(m[1]))
 		}
 	}