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Link preview #7

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Merged
asim merged 5 commits into from
May 23, 2025
Merged

Link preview #7

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afbebd8
Add link preview functionality to comments and posts
asim May 23, 2025
c01fb89
Fix bugs for linkpreview
asim May 23, 2025
fdfda51
update protos
asim May 23, 2025
6351e6d
FIx the build
asim May 23, 2025
c978d76
Make links clickable in the preview
asim May 23, 2025
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14 changes: 14 additions & 0 deletions comments/handler/comments.go
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,20 @@ func (h *Handler) Create(ctx context.Context, req *pb.CreateRequest, rsp *pb.Cre
CreatedAt: now,
}

// Extract first URL and fetch link preview
url := extractFirstURL(req.Content)
if url != "" {
title, desc, image, err := fetchLinkPreview(url)
if err == nil {
comment.LinkPreview = &pb.LinkPreview{
Url: url,
Title: title,
Description: desc,
Image: image,
}
}
}

rsp.Comment = comment

// Save to store
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61 changes: 61 additions & 0 deletions comments/handler/linkpreview.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,61 @@
package handler

import (
"net/http"
"regexp"
"strings"
"golang.org/x/net/html"
)

// Extracts the first URL from a string (simple regex)
func extractFirstURL(text string) string {
re := regexp.MustCompile(`https?://[^\s]+`)
match := re.FindString(text)
return match
}

// Fetches Open Graph/meta tags from a URL
func fetchLinkPreview(url string) (title, description, image string, err error) {
resp, err := http.Get(url)
if err != nil {
return
}
defer resp.Body.Close()
z := html.NewTokenizer(resp.Body)
for {
tt := z.Next()
switch tt {
case html.ErrorToken:
return // End of document
case html.StartTagToken, html.SelfClosingTagToken:
t := z.Token()
if t.Data == "meta" {
var property, content string
for _, a := range t.Attr {
if a.Key == "property" || a.Key == "name" {
property = a.Val
}
if a.Key == "content" {
content = a.Val
}
}
if property == "og:title" && title == "" {
title = content
}
if property == "og:description" && description == "" {
description = content
}
if property == "og:image" && image == "" {
image = content
}
if property == "description" && description == "" {
description = content
}
}
if t.Data == "title" && title == "" {
z.Next()
title = strings.TrimSpace(z.Token().Data)
}
}
}
}
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