Simple blogging system written in Go https://goblog.app
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320 lines
8.4 KiB

package main
import (
"context"
"errors"
"fmt"
"html/template"
"net/http"
"reflect"
"strconv"
"strings"
"sync"
"github.com/go-chi/chi/v5"
"github.com/vcraescu/go-paginator"
)
var errPostNotFound = errors.New("post not found")
type post struct {
Path string
Content string
Published string
Updated string
Parameters map[string][]string
Blog string
Section string
Status postStatus
Priority int
// Not persisted
Slug string
RenderedTitle string
renderCache map[bool]template.HTML
renderMutex sync.RWMutex
}
type postStatus string
const (
statusNil postStatus = ""
statusPublished postStatus = "published"
statusDraft postStatus = "draft"
statusPrivate postStatus = "private"
statusUnlisted postStatus = "unlisted"
)
func (a *goBlog) servePost(w http.ResponseWriter, r *http.Request) {
p, err := a.getPost(r.URL.Path)
if err == errPostNotFound {
a.serve404(w, r)
return
} else if err != nil {
a.serveError(w, r, err.Error(), http.StatusInternalServerError)
return
}
if asRequest, ok := r.Context().Value(asRequestKey).(bool); ok && asRequest {
if r.URL.Path == a.getRelativePath(p.Blog, "") {
a.serveActivityStreams(p.Blog, w, r)
return
}
a.serveActivityStreamsPost(p, w)
return
}
canonical := p.firstParameter("original")
if canonical == "" {
canonical = a.fullPostURL(p)
}
template := templatePost
if p.Path == a.getRelativePath(p.Blog, "") {
template = templateStaticHome
}
w.Header().Add("Link", fmt.Sprintf("<%s>; rel=shortlink", a.shortPostURL(p)))
a.render(w, r, template, &renderData{
BlogString: p.Blog,
Canonical: canonical,
Data: p,
})
}
func (a *goBlog) redirectToRandomPost(rw http.ResponseWriter, r *http.Request) {
randomPath, err := a.getRandomPostPath(r.Context().Value(blogKey).(string))
if err != nil {
a.serveError(rw, r, err.Error(), http.StatusInternalServerError)
return
}
http.Redirect(rw, r, randomPath, http.StatusFound)
}
type postPaginationAdapter struct {
config *postsRequestConfig
nums int64
a *goBlog
}
func (p *postPaginationAdapter) Nums() (int64, error) {
if p.nums == 0 {
nums, _ := p.a.db.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 := p.a.getPosts(&modifiedConfig)
reflect.ValueOf(data).Elem().Set(reflect.ValueOf(&posts).Elem())
return err
}
func (a *goBlog) serveHome(w http.ResponseWriter, r *http.Request) {
blog := r.Context().Value(blogKey).(string)
if asRequest, ok := r.Context().Value(asRequestKey).(bool); ok && asRequest {
a.serveActivityStreams(blog, w, r)
return
}
a.serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: a.getRelativePath(blog, ""),
})))
}
func (a *goBlog) serveDrafts(w http.ResponseWriter, r *http.Request) {
blog := r.Context().Value(blogKey).(string)
a.serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: a.getRelativePath(blog, "/editor/drafts"),
title: a.ts.GetTemplateStringVariant(a.cfg.Blogs[blog].Lang, "drafts"),
status: statusDraft,
})))
}
func (a *goBlog) servePrivate(w http.ResponseWriter, r *http.Request) {
blog := r.Context().Value(blogKey).(string)
a.serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: a.getRelativePath(blog, "/editor/private"),
title: a.ts.GetTemplateStringVariant(a.cfg.Blogs[blog].Lang, "privateposts"),
status: statusPrivate,
})))
}
func (a *goBlog) serveUnlisted(w http.ResponseWriter, r *http.Request) {
blog := r.Context().Value(blogKey).(string)
a.serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: a.getRelativePath(blog, "/editor/unlisted"),
title: a.ts.GetTemplateStringVariant(a.cfg.Blogs[blog].Lang, "unlistedposts"),
status: statusUnlisted,
})))
}
func (a *goBlog) 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 {
a.serve404(w, r)
return
}
var title, dPath strings.Builder
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))
}
a.serveIndex(w, r.WithContext(context.WithValue(r.Context(), indexConfigKey, &indexConfig{
path: a.getRelativePath(r.Context().Value(blogKey).(string), dPath.String()),
year: year,
month: month,
day: day,
title: title.String(),
})))
}
type indexConfig struct {
blog string
path string
section *configSection
tax *configTaxonomy
taxValue string
parameter string
year, month, day int
title string
description string
summaryTemplate string
status postStatus
}
const defaultPhotosPath = "/photos"
const indexConfigKey contextKey = "indexConfig"
func (a *goBlog) serveIndex(w http.ResponseWriter, r *http.Request) {
ic := r.Context().Value(indexConfigKey).(*indexConfig)
blog := ic.blog
if blog == "" {
blog, _ = r.Context().Value(blogKey).(string)
}
search := chi.URLParam(r, "search")
if search != "" {
// Decode and sanitize search
search = cleanHTMLText(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 a.cfg.Blogs[blog].Sections {
sections = append(sections, sectionKey)
}
}
status := ic.status
if status == statusNil {
status = statusPublished
}
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: status,
priorityOrder: true,
}, a: a}, a.cfg.Blogs[blog].Pagination)
p.SetPage(pageNo)
var posts []*post
err := p.Results(&posts)
if err != nil {
a.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", a.cfg.Blogs[blog].Search.Title, search)
}
// Check if feed
if ft := feedType(chi.URLParam(r, "feed")); ft != noFeed {
a.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", strings.TrimSuffix(path, "/"), prevPage)
}
hasNext, _ = p.HasNext()
if hasNext {
nextPage, _ = p.NextPage()
} else {
nextPage, _ = p.Page()
}
nextPath = fmt.Sprintf("%s/page/%d", strings.TrimSuffix(path, "/"), nextPage)
summaryTemplate := ic.summaryTemplate
if summaryTemplate == "" {
summaryTemplate = templateSummary
}
a.render(w, r, templateIndex, &renderData{
BlogString: blog,
Canonical: a.getFullAddress(path),
Data: map[string]interface{}{
"Title": title,
"Description": description,
"Posts": posts,
"HasPrev": hasPrev,
"HasNext": hasNext,
"First": path,
"Prev": prevPath,
"Next": nextPath,
"SummaryTemplate": summaryTemplate,
},
})
}