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package linkedin
import (
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"codeberg.org/snonux/gos/internal/colour"
"codeberg.org/snonux/gos/internal/config"
"codeberg.org/snonux/gos/internal/oi"
"golang.org/x/net/html"
)
var (
errNoTitleElementFound = errors.New("no title element found")
errNoImageElementFound = errors.New("no image element found")
)
type preview struct {
title, thumbnailURL, thumbnailDownloadPath, url string
}
func NewPreview(ctx context.Context, args config.Args, urls []string) (preview, error) {
var (
p preview
err error
)
if len(urls) == 0 {
return p, nil
}
p.url = urls[0]
if p.title, p.thumbnailURL, err = extractFromURL(ctx, urls[0]); err != nil {
if errors.Is(err, errNoTitleElementFound) || p.title == "" {
colour.Infoln("Setting title to", urls[0])
p.title = urls[0]
}
if errors.Is(err, errNoImageElementFound) {
colour.Infoln("URL", urls[0], "is without any image, that's fine, though.")
}
if !errors.Is(err, errNoTitleElementFound) && !errors.Is(err, errNoImageElementFound) {
colour.Infoln("Skipping LinkedIn preview metadata for", urls[0], "due to", err)
return p, nil
}
}
if p.thumbnailURL != "" {
if p.thumbnailDownloadPath, err = p.DownloadImage(args.CacheDir); err != nil {
colour.Infoln("Skipping LinkedIn preview image for", urls[0], "due to", err)
p.thumbnailDownloadPath = ""
return p, nil
}
colour.Infoln("Downloaded preview image to ", p.thumbnailDownloadPath)
}
return p, nil
}
func (p preview) String() string {
if p.thumbnailURL != "" {
return fmt.Sprintf("Title: %s; URL: %s, Image: %s", p.title, p.url, p.thumbnailURL)
}
return fmt.Sprintf("Title: %s; URL: %s", p.title, p.url)
}
func (p preview) TitleAndURL() (string, string, bool) {
return p.title, p.url, p.url != "" && p.title != ""
}
func (p preview) Thumbnail() (string, bool) {
return p.thumbnailDownloadPath, p.thumbnailDownloadPath != ""
}
func (p preview) DownloadImage(destPath string) (string, error) {
// Skip data URIs - they can't be downloaded and don't provide meaningful images
if u, err := url.Parse(p.thumbnailURL); err == nil && u.Scheme == "data" {
colour.Infoln("Skipping data URI image, using article metadata instead")
return "", nil
}
if err := oi.EnsureDir(destPath); err != nil {
return "", err
}
resp, err := http.Get(p.thumbnailURL)
if err != nil {
return "", err
}
defer func() {
if err := resp.Body.Close(); err != nil {
// Log the error but don't fail the operation since we've already read the data
colour.Errorln("Error closing response body:", err)
}
}()
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("bad status while trying to download image: %s", resp.Status)
}
destFile := fmt.Sprintf("%s/%s", destPath, filepath.Base(p.thumbnailURL))
out, err := os.Create(destFile)
if err != nil {
return destFile, fmt.Errorf("%s: %w", destFile, err)
}
defer func() {
if err := out.Close(); err != nil {
// Log the error but don't fail the operation since we've already written the data
colour.Errorln("Error closing output file:", err)
}
}()
_, err = io.Copy(out, resp.Body)
if err != nil {
return destFile, err
}
return destFile, nil
}
func findTitle(n *html.Node) (string, error) {
var title string
var traverse func(*html.Node)
traverse = func(n *html.Node) {
if n.Type == html.ElementNode && n.Data == "title" {
if n.FirstChild != nil {
title = n.FirstChild.Data
}
return
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
traverse(c)
}
}
traverse(n)
if title == "" {
return "", errNoTitleElementFound
}
return title, nil
}
func findFirstImage(n *html.Node) (string, error) {
var imageURL string
var traverse func(*html.Node) bool
traverse = func(n *html.Node) bool {
if n.Type == html.ElementNode && n.Data == "img" {
for _, attr := range n.Attr {
if attr.Key == "src" {
imageURL = attr.Val
return true // Stop searching when the first image's URL is found
}
}
}
for c := n.FirstChild; c != nil; c = c.NextSibling {
if traverse(c) {
return true
}
}
return false
}
if !traverse(n) {
return "", errNoImageElementFound
}
return imageURL, nil
}
func resolveURL(baseURL, rawURL string) (string, error) {
base, err := url.Parse(baseURL)
if err != nil {
return "", fmt.Errorf("failed to parse base URL: %w", err)
}
u, err := url.Parse(rawURL)
if err != nil {
return "", fmt.Errorf("failed to parse raw URL: %w", err)
}
return base.ResolveReference(u).String(), nil
}
func extractFromURL(ctx context.Context, url string) (string, string, error) {
req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
if err != nil {
return "", "", fmt.Errorf("failed to create request: %w", err)
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", "", fmt.Errorf("failed to get URL: %w", err)
}
defer func() {
if err := resp.Body.Close(); err != nil {
// Log the error but don't fail the operation since we've already read the data
colour.Errorln("Error closing response body:", err)
}
}()
if resp.StatusCode != http.StatusOK {
return "", "", fmt.Errorf("failed to get a successful response: %v", resp.StatusCode)
}
return extract(url, resp.Body)
}
func extract(url string, htmlBody io.Reader) (string, string, error) {
doc, err := html.Parse(htmlBody)
if err != nil {
return "", "", fmt.Errorf("failed to parse HTML: %w", err)
}
var errs error
title, err := findTitle(doc)
if err != nil {
errs = errors.Join(errs, err)
}
imageURL, err := findFirstImage(doc)
if err != nil {
errs = errors.Join(errs, err)
} else if imageURL != "" {
if imageURL, err = resolveURL(url, imageURL); err != nil {
errs = errors.Join(errs, err)
}
}
return title, imageURL, errs
}
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