This is my new blog CMS https://jlelse.blog
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package main
import (
"context"
"errors"
"fmt"
"html/template"
"net/http"
"reflect"
"strconv"
"strings"
"github.com/go-chi/chi/v5"
"github.com/microcosm-cc/bluemonday"
servertiming "github.com/mitchellh/go-server-timing"
"github.com/vcraescu/go-paginator"
)
var errPostNotFound = errors.New("post not found")
type post struct {
Path string `json:"path"`
Content string `json:"content"`
Published string `json:"published"`
Updated string `json:"updated"`
Parameters map[string][]string `json:"parameters"`
Blog string `json:"blog"`
Section string `json:"section"`
Status postStatus `json:"status"`
// Not persisted
Slug string `json:"slug"`
rendered template.HTML
absoluteRendered template.HTML
}
type postStatus string
const (
statusNil postStatus = ""
statusPublished postStatus = "published"
statusDraft postStatus = "draft"
)
func servePost(w http.ResponseWriter, r *http.Request) {
t := servertiming.FromContext(r.Context()).NewMetric("gp").Start()
p, err := getPost(r.URL.Path)
t.Stop()
if err == errPostNotFound {
serve404(w, r)
return
} else if err != nil {
serveError(w, r, err.Error(), http.StatusInternalServerError)
return
}
if asRequest, ok := r.Context().Value(asRequestKey).(bool); ok && asRequest {
if r.URL.Path == blogPath(p.Blog) {
appConfig.Blogs[p.Blog].serveActivityStreams(p.Blog, w, r)
return
}
p.serveActivityStreams(w)
return
}
canonical := p.firstParameter("original")
if canonical == "" {
canonical = p.fullURL()
}
template := templatePost
if p.Path == appConfig.Blogs[p.Blog].Path {
template = templateStaticHome
}
w.Header().Add("Link", fmt.Sprintf("<%s>; rel=shortlink", p.shortURL()))
render(w, r, template, &renderData{
BlogString: p.Blog,
Canonical: canonical,
Data: p,
})
}
func redirectToRandomPost(rw http.ResponseWriter, r *http.Request) {
randomPath, err := getRandomPostPath(r.Context().Value(blogContextKey).(string))
if err != nil {
serveError(rw, r, err.Error(), http.StatusInternalServerError)
return
}
http.Redirect(rw, r, randomPath, http.StatusFound)
}
type postPaginationAdapter struct {
config *postsRequestConfig
nums int64
}
func (p *postPaginationAdapter) Nums() (int64, error) {
if p.nums == 0 {
nums, _ := countPosts(p.config)
p.nums = int64(nums)
}
return p.nums, nil
}
func (p *postPaginationAdapter) Slice(offset, length int, data interface{}) error {
modifiedConfig := *p.config
modifiedConfig.offset = offset
modifiedConfig.limit = length
posts, err := getPosts(&modifiedConfig)
reflect.ValueOf(data).Elem().Set(reflect.ValueOf(&posts).Elem())
return err
}
func serveHome(w http.ResponseWriter, r *http.Request) {
blog := r.Context().Value(blogContextKey).(string)
if asRequest, ok := r.Context().Value(asRequestKey).(bool); ok && asRequest {
appConfig.Blogs[blog].serveActivityStreams(blog, w, r)
return
}
serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: blogPath(blog),
})))
}
func serveDate(w http.ResponseWriter, r *http.Request) {
var year, month, day int
if ys := chi.URLParam(r, "year"); ys != "" && ys != "x" {
year, _ = strconv.Atoi(ys)
}
if ms := chi.URLParam(r, "month"); ms != "" && ms != "x" {
month, _ = strconv.Atoi(ms)
}
if ds := chi.URLParam(r, "day"); ds != "" {
day, _ = strconv.Atoi(ds)
}
if year == 0 && month == 0 && day == 0 {
serve404(w, r)
return
}
var title, dPath strings.Builder
dPath.WriteString(blogPath(r.Context().Value(blogContextKey).(string)) + "/")
if year != 0 {
ys := fmt.Sprintf("%0004d", year)
title.WriteString(ys)
dPath.WriteString(ys)
} else {
title.WriteString("XXXX")
dPath.WriteString("x")
}
if month != 0 {
title.WriteString(fmt.Sprintf("-%02d", month))
dPath.WriteString(fmt.Sprintf("/%02d", month))
} else if day != 0 {
title.WriteString("-XX")
dPath.WriteString("/x")
}
if day != 0 {
title.WriteString(fmt.Sprintf("-%02d", day))
dPath.WriteString(fmt.Sprintf("/%02d", day))
}
serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: dPath.String(),
year: year,
month: month,
day: day,
title: title.String(),
})))
}
type indexConfig struct {
blog string
path string
section *section
tax *taxonomy
taxValue string
parameter string
year, month, day int
title string
description string
summaryTemplate string
}
const indexConfigKey requestContextKey = "indexConfig"
func serveIndex(w http.ResponseWriter, r *http.Request) {
ic := r.Context().Value(indexConfigKey).(*indexConfig)
blog := ic.blog
if blog == "" {
blog, _ = r.Context().Value(blogContextKey).(string)
}
search := chi.URLParam(r, "search")
if search != "" {
search = searchDecode(search)
}
pageNoString := chi.URLParam(r, "page")
pageNo, _ := strconv.Atoi(pageNoString)
var sections []string
if ic.section != nil {
sections = []string{ic.section.Name}
} else {
for sectionKey := range appConfig.Blogs[blog].Sections {
sections = append(sections, sectionKey)
}
}
p := paginator.New(&postPaginationAdapter{config: &postsRequestConfig{
blog: blog,
sections: sections,
taxonomy: ic.tax,
taxonomyValue: ic.taxValue,
parameter: ic.parameter,
search: search,
publishedYear: ic.year,
publishedMonth: ic.month,
publishedDay: ic.day,
status: statusPublished,
}}, appConfig.Blogs[blog].Pagination)
p.SetPage(pageNo)
var posts []*post
t := servertiming.FromContext(r.Context()).NewMetric("gp").Start()
err := p.Results(&posts)
t.Stop()
if err != nil {
serveError(w, r, err.Error(), http.StatusInternalServerError)
return
}
// Meta
title := ic.title
description := ic.description
if ic.tax != nil {
title = fmt.Sprintf("%s: %s", ic.tax.Title, ic.taxValue)
} else if ic.section != nil {
title = ic.section.Title
description = ic.section.Description
} else if search != "" {
title = fmt.Sprintf("%s: %s", appConfig.Blogs[blog].Search.Title, search)
}
// Clean title
title = bluemonday.StrictPolicy().Sanitize(title)
// Check if feed
if ft := feedType(chi.URLParam(r, "feed")); ft != noFeed {
generateFeed(blog, ft, w, r, posts, title, description)
return
}
// Path
path := ic.path
if strings.Contains(path, searchPlaceholder) {
path = strings.ReplaceAll(path, searchPlaceholder, searchEncode(search))
}
// Navigation
var hasPrev, hasNext bool
var prevPage, nextPage int
var prevPath, nextPath string
hasPrev, _ = p.HasPrev()
if hasPrev {
prevPage, _ = p.PrevPage()
} else {
prevPage, _ = p.Page()
}
if prevPage < 2 {
prevPath = path
} else {
prevPath = fmt.Sprintf("%s/page/%d", path, prevPage)
}
hasNext, _ = p.HasNext()
if hasNext {
nextPage, _ = p.NextPage()
} else {
nextPage, _ = p.Page()
}
nextPath = fmt.Sprintf("%s/page/%d", path, nextPage)
summaryTemplate := ic.summaryTemplate
if summaryTemplate == "" {
summaryTemplate = templateSummary
}
render(w, r, templateIndex, &renderData{
BlogString: blog,
Canonical: appConfig.Server.PublicAddress + path,
Data: map[string]interface{}{
"Title": title,
"Description": description,
"Posts": posts,
"HasPrev": hasPrev,
"HasNext": hasNext,
"First": slashIfEmpty(path),
"Prev": slashIfEmpty(prevPath),
"Next": slashIfEmpty(nextPath),
"SummaryTemplate": summaryTemplate,
},
})
}