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package builder
import (
"encoding/xml"
"io"
"os"
"path/filepath"
"strings"
"text/template"
"website/internal/atom"
"website/internal/config"
"website/internal/content"
"github.com/PuerkitoBio/goquery"
"github.com/antchfx/xmlquery"
"github.com/antchfx/xpath"
"github.com/pkg/errors"
)
var (
css string
templateFiles = make(map[string]*os.File)
nsMap = map[string]string{
"xsl": "http://www.w3.org/1999/XSL/Transform",
"atom": "http://www.w3.org/2005/Atom",
"xhtml": "http://www.w3.org/1999/xhtml",
}
)
func loadCSS(source string) {
bytes, err := os.ReadFile(filepath.Join(source, "templates/style.css"))
if err != nil {
panic(err)
}
css = string(bytes)
}
func loadTemplate(path string) (file *os.File, err error) {
if templateFiles[path] == nil {
file, err = os.OpenFile(path, os.O_RDONLY, 0)
if err != nil {
return nil, errors.Wrapf(err, "could not load template at path %s", path)
}
templateFiles[path] = file
}
file = templateFiles[path]
return
}
type QuerySelection struct {
*goquery.Selection
}
type QueryDocument struct {
*goquery.Document
}
func NewDocumentFromReader(r io.Reader) (*QueryDocument, error) {
doc, err := goquery.NewDocumentFromReader(r)
return &QueryDocument{doc}, errors.Wrap(err, "could not create query document")
}
func (q *QueryDocument) Find(selector string) *QuerySelection {
return &QuerySelection{q.Document.Find(selector)}
}
func renderRobotsTXT(source string, config *config.Config) (io.Reader, error) {
r, w := io.Pipe()
tpl, err := template.ParseFiles(filepath.Join(source, "templates/robots.tmpl"))
if err != nil {
return nil, err
}
go func() {
err = tpl.Execute(w, map[string]interface{}{
"BaseURL": config.BaseURL,
})
if err != nil {
w.CloseWithError(err)
}
w.Close()
}()
return r, nil
}
func renderFeed(
source string,
title string,
config *config.Config,
posts []content.Post,
specific string,
) (io.Reader, error) {
reader, err := loadTemplate(filepath.Join(source, "templates/feed.xml"))
if err != nil {
return nil, err
}
defer func() {
_, err := reader.Seek(0, io.SeekStart)
if err != nil {
panic("could not reset reader: " + err.Error())
}
}()
doc, err := xmlquery.Parse(reader)
if err != nil {
return nil, errors.Wrap(err, "could not parse XML")
}
feed := doc.SelectElement("feed")
feed.SelectElement("title").FirstChild.Data = title
feed.SelectElement("link").SetAttr("href", config.BaseURL.String())
feed.SelectElement("id").FirstChild.Data = atom.MakeTagURI(config, specific)
datetime, err := posts[0].Date.UTC().MarshalText()
if err != nil {
return nil, errors.Wrap(err, "could not convert post date to text")
}
feed.SelectElement("updated").FirstChild.Data = string(datetime)
tpl := feed.SelectElement("entry")
xmlquery.RemoveFromTree(tpl)
for _, post := range posts {
fullURL := config.BaseURL.JoinPath(post.URL).String()
text, err := xml.MarshalIndent(&atom.FeedEntry{
Title: post.Title,
Link: atom.MakeLink(fullURL),
ID: atom.MakeTagURI(config, post.Basename),
Updated: post.Date.UTC(),
Summary: post.Description,
Author: config.Title,
Content: atom.FeedContent{
Content: post.Content,
Type: "html",
},
}, " ", " ")
if err != nil {
return nil, errors.Wrap(err, "could not marshal xml")
}
entry, err := xmlquery.ParseWithOptions(
strings.NewReader(string(text)),
xmlquery.ParserOptions{
Decoder: &xmlquery.DecoderOptions{
Strict: false,
AutoClose: xml.HTMLAutoClose,
Entity: xml.HTMLEntity,
},
},
)
if err != nil {
return nil, errors.Wrap(err, "could not parse XML")
}
xmlquery.AddChild(feed, entry.SelectElement("entry"))
}
return strings.NewReader(doc.OutputXML(true)), nil
}
func renderFeedStyles(source string) (*strings.Reader, error) {
tpl, err := template.ParseFiles(filepath.Join(source, "templates/feed-styles.xsl"))
if err != nil {
return nil, err
}
esc := &strings.Builder{}
err = xml.EscapeText(esc, []byte(css))
if err != nil {
return nil, err
}
w := &strings.Builder{}
err = tpl.Execute(w, map[string]interface{}{
"css": esc.String(),
})
return strings.NewReader(w.String()), nil
}
func getFeedStylesHash(r io.Reader) (string, error) {
doc, err := xmlquery.Parse(r)
if err != nil {
return "", err
}
expr, err := xpath.CompileWithNS("//xhtml:style", nsMap)
if err != nil {
return "", errors.Wrap(err, "could not parse XPath")
}
style := xmlquery.QuerySelector(doc, expr)
return hash(style.InnerText()), nil
}
func getHTMLStyleHash(filenames ...string) (string, error) {
fn := filepath.Join(filenames...)
f, err := os.Open(fn)
if err != nil {
return "", err
}
defer f.Close()
doc, err := NewDocumentFromReader(f)
if err != nil {
return "", err
}
html := doc.Find("head > style").Text()
return hash(html), nil
}
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