package main
import (
"errors"
"fmt"
"html/template"
"net/http"
"reflect"
"strconv"
"strings"
"github.com/go-chi/chi"
"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"`
// Not persisted
Slug string `json:"slug"`
rendered template.HTML
}
func servePost(w http.ResponseWriter, r *http.Request) {
as := strings.HasSuffix(r.URL.Path, ".as")
if as {
r.URL.Path = strings.TrimSuffix(r.URL.Path, ".as")
}
p, err := getPost(r.URL.Path)
if err == errPostNotFound {
serve404(w, r)
return
} else if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if as {
p.serveActivityStreams(w)
return
}
canonical := p.firstParameter("original")
if canonical == "" {
canonical = p.fullURL()
}
render(w, templatePost, &renderData{
blogString: p.Blog,
Canonical: canonical,
Data: p,
})
}
type postPaginationAdapter struct {
config *postsRequestConfig
nums int
}
func (p *postPaginationAdapter) Nums() int {
if p.nums == 0 {
p.nums, _ = countPosts(p.config)
}
return p.nums
}
func (p *postPaginationAdapter) Slice(offset, length int, data interface{}) error {
if reflect.TypeOf(data).Kind() != reflect.Ptr {
panic("data has to be a pointer")
}
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(blog string, path string) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
as := strings.HasSuffix(r.URL.Path, ".as")
if as {
appConfig.Blogs[blog].serveActivityStreams(blog, w)
return
}
serveIndex(&indexConfig{
blog: blog,
path: path,
})(w, r)
}
}
func serveSection(blog string, path string, section *section) func(w http.ResponseWriter, r *http.Request) {
return serveIndex(&indexConfig{
blog: blog,
path: path,
section: section,
})
}
func serveTaxonomy(blog string, tax *taxonomy) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
allValues, err := allTaxonomyValues(blog, tax.Name)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
render(w, templateTaxonomy, &renderData{
blogString: blog,
Canonical: appConfig.Server.PublicAddress + r.URL.Path,
Data: struct {
Taxonomy *taxonomy
TaxonomyValues []string
}{
Taxonomy: tax,
TaxonomyValues: allValues,
},
})
}
}
func serveTaxonomyValue(blog string, path string, tax *taxonomy, value string) func(w http.ResponseWriter, r *http.Request) {
return serveIndex(&indexConfig{
blog: blog,
path: path,
tax: tax,
taxValue: value,
})
}
func servePhotos(blog string, path string) func(w http.ResponseWriter, r *http.Request) {
return serveIndex(&indexConfig{
blog: blog,
path: path,
parameter: appConfig.Blogs[blog].Photos.Parameter,
title: appConfig.Blogs[blog].Photos.Title,
description: appConfig.Blogs[blog].Photos.Description,
summaryTemplate: templatePhotosSummary,
})
}
func serveSearchResults(blog string, path string) func(w http.ResponseWriter, r *http.Request) {
return serveIndex(&indexConfig{
blog: blog,
path: path,
})
}
type indexConfig struct {
blog string
path string
section *section
tax *taxonomy
taxValue string
parameter string
title string
description string
summaryTemplate string
}
func serveIndex(ic *indexConfig) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
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[ic.blog].Sections {
sections = append(sections, sectionKey)
}
}
p := paginator.New(&postPaginationAdapter{config: &postsRequestConfig{
blog: ic.blog,
sections: sections,
taxonomy: ic.tax,
taxonomyValue: ic.taxValue,
parameter: ic.parameter,
search: search,
}}, appConfig.Blogs[ic.blog].Pagination)
p.SetPage(pageNo)
var posts []*post
err := p.Results(&posts)
if err != nil {
http.Error(w, 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[ic.blog].Search.Title, search)
}
// Check if feed
if ft := feedType(chi.URLParam(r, "feed")); ft != noFeed {
generateFeed(ic.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
prevPage, err := p.PrevPage()
if err == paginator.ErrNoPrevPage {
prevPage = p.Page()
}
prevPath := fmt.Sprintf("%s/page/%d", path, prevPage)
if prevPage < 2 {
prevPath = path
}
nextPage, err := p.NextPage()
if err == paginator.ErrNoNextPage {
nextPage = p.Page()
}
nextPath := fmt.Sprintf("%s/page/%d", path, nextPage)
summaryTemplate := ic.summaryTemplate
if summaryTemplate == "" {
summaryTemplate = templateSummary
}
render(w, templateIndex, &renderData{
blogString: ic.blog,
Canonical: appConfig.Server.PublicAddress + getBlogRelativePath(ic.blog, path),
Data: map[string]interface{}{
"Title": title,
"Description": description,
"Posts": posts,
"HasPrev": p.HasPrev(),
"HasNext": p.HasNext(),
"First": getBlogRelativePath(ic.blog, path),
"Prev": getBlogRelativePath(ic.blog, prevPath),
"Next": getBlogRelativePath(ic.blog, nextPath),
"SummaryTemplate": summaryTemplate,
},
})
}
}