bf8c622bcd
Replace the Google Favicons API with HTML head tag parsing to find higher-quality logos (SVG, apple-touch-icon, large PNG icons, msapplication-TileImage). The new pkg/webinspect package parses a website's DOM tree and is extensible for future resource extraction (footer links, etc.). Signed-off-by: Émile Ré <emile@getprobo.com>
111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice appear in all copies.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
|
|
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
|
|
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
|
|
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
|
|
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
// PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
package webinspect
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"net/url"
|
|
|
|
"golang.org/x/net/html"
|
|
)
|
|
|
|
type PageInfo struct {
|
|
URL *url.URL
|
|
Root *html.Node
|
|
}
|
|
|
|
func Parse(ctx context.Context, client *http.Client, websiteURL string) (*PageInfo, error) {
|
|
parsed, err := url.Parse(websiteURL)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse website URL: %w", err)
|
|
}
|
|
|
|
req, err := http.NewRequestWithContext(ctx, http.MethodGet, websiteURL, nil)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot create request: %w", err)
|
|
}
|
|
|
|
resp, err := client.Do(req)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot fetch page: %w", err)
|
|
}
|
|
defer func() { _ = resp.Body.Close() }()
|
|
|
|
if resp.StatusCode != http.StatusOK {
|
|
return nil, fmt.Errorf("cannot fetch page: status %d", resp.StatusCode)
|
|
}
|
|
|
|
return ParseHTML(parsed, resp.Body)
|
|
}
|
|
|
|
func ParseHTML(baseURL *url.URL, r io.Reader) (*PageInfo, error) {
|
|
root, err := html.Parse(r)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot parse HTML: %w", err)
|
|
}
|
|
|
|
return &PageInfo{URL: baseURL, Root: root}, nil
|
|
}
|
|
|
|
func (p *PageInfo) ResolveHref(href string) string {
|
|
ref, err := url.Parse(href)
|
|
if err != nil {
|
|
return href
|
|
}
|
|
|
|
return p.URL.ResolveReference(ref).String()
|
|
}
|
|
|
|
func findElement(n *html.Node, tag string) *html.Node {
|
|
if n.Type == html.ElementNode && n.Data == tag {
|
|
return n
|
|
}
|
|
|
|
for c := n.FirstChild; c != nil; c = c.NextSibling {
|
|
if found := findElement(c, tag); found != nil {
|
|
return found
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func findAllIn(parent *html.Node, tag string) []*html.Node {
|
|
var nodes []*html.Node
|
|
|
|
for c := parent.FirstChild; c != nil; c = c.NextSibling {
|
|
if c.Type == html.ElementNode && c.Data == tag {
|
|
nodes = append(nodes, c)
|
|
}
|
|
|
|
nodes = append(nodes, findAllIn(c, tag)...)
|
|
}
|
|
|
|
return nodes
|
|
}
|
|
|
|
func attrVal(n *html.Node, key string) string {
|
|
for _, a := range n.Attr {
|
|
if a.Key == key {
|
|
return a.Val
|
|
}
|
|
}
|
|
|
|
return ""
|
|
}
|