GoBlog/blogroll.go

149 lines
3.9 KiB
Go

package main
import (
"bytes"
"context"
"log"
"net/http"
"sort"
"strings"
"time"
"github.com/carlmjohnson/requests"
"github.com/kaorimatz/go-opml"
"github.com/samber/lo"
"go.goblog.app/app/pkgs/bufferpool"
"go.goblog.app/app/pkgs/contenttype"
)
const defaultBlogrollPath = "/blogroll"
func (a *goBlog) serveBlogroll(w http.ResponseWriter, r *http.Request) {
blog, bc := a.getBlog(r)
outlines, err, _ := a.blogrollCacheGroup.Do(blog, func() (any, error) {
return a.getBlogrollOutlines(blog)
})
if err != nil {
log.Printf("Failed to get outlines: %v", err)
a.serveError(w, r, "", http.StatusInternalServerError)
return
}
c := bc.Blogroll
can := bc.getRelativePath(defaultIfEmpty(c.Path, defaultBlogrollPath))
a.render(w, r, a.renderBlogroll, &renderData{
Canonical: a.getFullAddress(can),
Data: &blogrollRenderData{
title: c.Title,
description: c.Description,
outlines: outlines.([]*opml.Outline),
download: can + ".opml",
},
})
}
func (a *goBlog) serveBlogrollExport(w http.ResponseWriter, r *http.Request) {
blog, _ := a.getBlog(r)
outlines, err, _ := a.blogrollCacheGroup.Do(blog, func() (any, error) {
return a.getBlogrollOutlines(blog)
})
if err != nil {
log.Printf("Failed to get outlines: %v", err)
a.serveError(w, r, "", http.StatusInternalServerError)
return
}
opmlBuf := bufferpool.Get()
defer bufferpool.Put(opmlBuf)
if err = opml.Render(opmlBuf, &opml.OPML{
Version: "2.0",
DateCreated: time.Now().UTC(),
Outlines: outlines.([]*opml.Outline),
}); err != nil {
log.Printf("Failed to render OPML: %v", err)
a.serveError(w, r, "", http.StatusInternalServerError)
return
}
w.Header().Set(contentType, contenttype.XMLUTF8)
_ = a.min.Get().Minify(contenttype.XML, w, opmlBuf)
}
func (a *goBlog) getBlogrollOutlines(blog string) ([]*opml.Outline, error) {
config := a.cfg.Blogs[blog].Blogroll
if cache := a.db.loadOutlineCache(blog); cache != nil {
return cache, nil
}
rb := requests.URL(config.Opml).Client(a.httpClient).UserAgent(appUserAgent)
if config.AuthHeader != "" && config.AuthValue != "" {
rb.Header(config.AuthHeader, config.AuthValue)
}
var o *opml.OPML
err := rb.Handle(func(r *http.Response) (err error) {
defer r.Body.Close()
o, err = opml.Parse(r.Body)
return
}).Fetch(context.Background())
if err != nil {
return nil, err
}
outlines := o.Outlines
if len(config.Categories) > 0 {
filtered := []*opml.Outline{}
for _, category := range config.Categories {
if outline, ok := lo.Find(outlines, func(outline *opml.Outline) bool {
return outline.Title == category || outline.Text == category
}); ok && outline != nil {
outline.Outlines = sortOutlines(outline.Outlines)
filtered = append(filtered, outline)
}
}
outlines = filtered
} else {
outlines = sortOutlines(outlines)
}
a.db.cacheOutlines(blog, outlines)
return outlines, nil
}
func (db *database) cacheOutlines(blog string, outlines []*opml.Outline) {
opmlBuffer := bufferpool.Get()
_ = opml.Render(opmlBuffer, &opml.OPML{
Version: "2.0",
DateCreated: time.Now().UTC(),
Outlines: outlines,
})
_ = db.cachePersistently("blogroll_"+blog, opmlBuffer.Bytes())
bufferpool.Put(opmlBuffer)
}
func (db *database) loadOutlineCache(blog string) []*opml.Outline {
data, err := db.retrievePersistentCache("blogroll_" + blog)
if err != nil || data == nil {
return nil
}
o, err := opml.Parse(bytes.NewReader(data))
if err != nil {
return nil
}
if time.Since(o.DateCreated).Minutes() > 60 {
return nil
}
return o.Outlines
}
func sortOutlines(outlines []*opml.Outline) []*opml.Outline {
sort.Slice(outlines, func(i, j int) bool {
name1 := outlines[i].Title
if name1 == "" {
name1 = outlines[i].Text
}
name2 := outlines[j].Title
if name2 == "" {
name2 = outlines[j].Text
}
return strings.ToLower(name1) < strings.ToLower(name2)
})
for _, outline := range outlines {
outline.Outlines = sortOutlines(outline.Outlines)
}
return outlines
}