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package main
import (
"bytes"
"encoding/xml"
"errors"
"fmt"
"log"
"net/http"
"strings"
"time"
"github.com/gorilla/mux"
"riedstra.dev/mitch/go-website/page"
)
type Author struct {
Name string `xml:"name"` // Required
Uri string `xml:"uri,omitempty"`
Email string `xml:"email,omitempty"`
}
type Link struct {
Href string `xml:"href,attr,omitempty"`
Rel string `xml:"rel,attr,omitempty"`
Type string `xml:"type,attr,omitempty"`
Title string `xml:"Title,attr,omitempty"`
Length string `xml:"Length,attr,omitempty"`
}
type Content struct {
Type string `xml:"type,attr"`
Data []byte `xml:"chardata"`
}
type Entry struct {
// Spec requires this, autogenerated from Title and updated if otherwise
// left empty
Id string `xml:"id"`
Title string `xml:"title"` // Required
Updated *time.Time `xml:"updated"` // Required
Author *Author `xml:"author,omitempty"`
Published time.Time `xml:"published,omitempty"`
Links []Link `xml:"link,omitempty"`
Content Content `xml:"content,omitempty"`
}
func (i Entry) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
type Alias Entry
errs := []string{}
if i.Title == "" {
errs = append(errs, "Title Cannot be empty")
}
if i.Updated == nil {
errs = append(errs, "Updated cannot be nil")
}
if i.Id == "" {
i.Id = fmt.Sprintf("%s::%d", i.Title, i.Updated.Unix())
}
if len(errs) > 0 {
return errors.New(strings.Join(errs, ","))
}
return e.EncodeElement(
&struct {
*Alias
}{
Alias: (*Alias)(&i),
}, start)
}
type Atom struct {
XMLName xml.Name `xml:"feed"`
Ns string `xml:"xmlns,attr"`
Title string `xml:"title"` // Required
Id string `xml:"id"` // Required
Author Author `xml:"author,omitempty"` // Required
Updated *time.Time `xml:"updated"` // Required
Published *time.Time `xml:"published,omitempty"`
Subtitle string `xml:"subtitle,omitempty"`
Entries []Entry `xml:"entry"`
}
func (a Atom) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
type Alias Atom
a.Ns = "http://www.w3.org/2005/Atom"
errs := []string{}
if a.Id == "" {
errs = append(errs, "ID Cannot be empty")
}
if a.Author.Name == "" {
errs = append(errs, "Author Name cannot be empty")
}
if a.Updated == nil {
errs = append(errs, "Updated cannot be empty")
}
if len(errs) > 0 {
return errors.New(strings.Join(errs, ","))
}
return e.EncodeElement(
&struct {
*Alias
}{
Alias: (*Alias)(&a),
}, start)
}
func (a *App) FeedHandler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
tag, ok := vars["tag"]
if !ok {
http.Error(w, "Tag not found or supplied", http.StatusNotFound)
return
}
p := page.NewPage("index")
index, err := p.Index()
if err != nil {
log.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
pages, ok := index[tag]
if !ok {
http.Error(w, "Invalid tag", http.StatusNotFound)
return
}
feed := &Atom{
Author: a.Author,
Title: a.Title,
Id: a.FeedId,
Updated: &a.Updated.Time,
Subtitle: a.Description,
}
entries := []Entry{}
for _, p := range pages {
if p.Date == nil {
log.Printf("Warning, page %s has no Date field. Skipping inclusion on feed", p)
continue
}
content := &bytes.Buffer{}
err := p.Render(content)
if err != nil {
log.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
entries = append(entries, Entry{
Title: p.Title,
Updated: &p.Date.Time,
Links: []Link{Link{Href: p.Path()}},
Content: Content{Type: "html", Data: content.Bytes()},
})
}
feed.Entries = entries
enc := xml.NewEncoder(w)
enc.Indent("", " ")
err = enc.Encode(feed)
if err != nil {
log.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
}
return
}
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