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package main
import (
"io"
"net/url"
"strconv"
"strings"
"time"
"golang.org/x/net/html"
)
// parse takes an io.Reader which is supposed to be an entire web page (like http.Response.Body)
// and returns the separate posts found inside.
func parse(r io.Reader) (c *channel, err error) {
c = &channel{}
doc, err := html.Parse(r)
if err != nil {
return
}
var f func(*html.Node)
f = func(n *html.Node) {
if n.Type == html.ElementNode && n.Data == "meta" {
var prop string
for _, a := range n.Attr {
if a.Key == "property" {
prop = a.Val
}
if a.Key == "content" {
switch prop {
case "og:title":
c.Title = a.Val
case "og:description":
c.Description = a.Val
}
}
}
}
if n.Type == html.ElementNode && n.Data == "div" {
for _, a := range n.Attr {
if a.Key == "class" && strings.Contains(a.Val, "userContentWrapper") {
var p post
parseNode(n, &p)
c.Items = append(c.Items, &p)
break
}
}
}
// loop further down
for c := n.FirstChild; c != nil; c = c.NextSibling {
f(c)
}
}
f(doc)
return
}
func parseNode(n *html.Node, p *post) {
if n.Type == html.ElementNode {
switch n.Data {
// fetch time stamp from header
case "abbr":
for _, attr := range n.Attr {
if attr.Key == "data-utime" {
unix, _ := strconv.ParseInt(attr.Val, 10, 64)
p.Time = time.Unix(unix, 0)
return
}
}
// skip post header with name of group and check-in
case "h5":
return
// skip "show more", aria-hidden and accessible stuff
case "span":
fallthrough
case "a":
fallthrough
case "div":
for _, attr := range n.Attr {
if attr.Key == "class" && attr.Val == "text_exposed_hide" {
return
}
if attr.Key == "class" && strings.Contains(attr.Val, "accessible_elem") {
return
}
if attr.Key == "aria-hidden" && attr.Val == "true" {
return
}
}
// parse paragraphs
case "p":
parseParagraph(n, p)
p.Content += "\n\n"
return
// get images
case "img":
parseImage(n, p)
return
}
}
// fetch all pure text elements outside proper post paragraphs
if n.Type == html.TextNode {
p.Content += n.Data
if n.Parent.Type == html.ElementNode && n.Parent.Data == "a" {
parseLink(n.Parent, p)
}
p.Content += "\n"
}
// loop deeper
for c := n.FirstChild; c != nil; c = c.NextSibling {
parseNode(c, p)
}
}
func parseParagraph(n *html.Node, p *post) {
// fetch all pure text elements
if n.Type == html.TextNode {
p.Content += n.Data
if n.Parent.Type == html.ElementNode && n.Parent.Data == "a" {
parseLink(n.Parent, p)
return
}
}
// normal linebreak within paragraphs
if n.Type == html.ElementNode && n.Data == "br" {
p.Content += "\n"
return
}
// loop deeper
for c := n.FirstChild; c != nil; c = c.NextSibling {
parseParagraph(c, p)
}
}
func parseImage(n *html.Node, p *post) {
img := &image{}
for _, attr := range n.Attr {
switch attr.Key {
case "src":
img.Source = attr.Val
case "alt":
fallthrough
case "title":
fallthrough
case "aria-label":
img.Caption = attr.Val
}
}
p.Images = append(p.Images, img)
}
func parseLink(n *html.Node, p *post) {
for _, attr := range n.Attr {
switch attr.Key {
case "href":
urlraw, _ := url.PathUnescape(attr.Val)
url, _ := url.Parse(urlraw)
external := url.Query().Get("u")
if external != "" {
p.Content += " (" + external + ")"
} else {
base := strings.Split(urlraw, "?")[0]
if base[0] == '/' {
base = "https://www.facebook.com" + base
}
p.Content += " (" + base + ")"
}
}
}
}
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