mirror of
https://github.com/golang/go
synced 2024-11-18 15:44:41 -07:00
3769738f41
This change makes it possible for users of the blog package to provide analytics HTML, which can then be inserted on pages. Previously, this was possible by making ad-hoc modifications to the template files. It's easier to have a dedicated field. Change-Id: Id7c24dc9c7b5b9e23d18f3987f2f1af27c709681 Reviewed-on: https://go-review.googlesource.com/c/tools/+/198323 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
463 lines
11 KiB
Go
463 lines
11 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package blog implements a web server for articles written in present format.
|
|
package blog // import "golang.org/x/tools/blog"
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"encoding/xml"
|
|
"fmt"
|
|
"html/template"
|
|
"log"
|
|
"net/http"
|
|
"os"
|
|
"path/filepath"
|
|
"regexp"
|
|
"sort"
|
|
"strings"
|
|
"time"
|
|
|
|
"golang.org/x/tools/blog/atom"
|
|
"golang.org/x/tools/present"
|
|
)
|
|
|
|
var (
|
|
validJSONPFunc = regexp.MustCompile(`(?i)^[a-z_][a-z0-9_.]*$`)
|
|
// used to serve relative paths when ServeLocalLinks is enabled.
|
|
golangOrgAbsLinkReplacer = strings.NewReplacer(
|
|
`href="https://golang.org/pkg`, `href="/pkg`,
|
|
`href="https://golang.org/cmd`, `href="/cmd`,
|
|
)
|
|
)
|
|
|
|
// Config specifies Server configuration values.
|
|
type Config struct {
|
|
ContentPath string // Relative or absolute location of article files and related content.
|
|
TemplatePath string // Relative or absolute location of template files.
|
|
|
|
BaseURL string // Absolute base URL (for permalinks; no trailing slash).
|
|
BasePath string // Base URL path relative to server root (no trailing slash).
|
|
GodocURL string // The base URL of godoc (for menu bar; no trailing slash).
|
|
Hostname string // Server host name, used for rendering ATOM feeds.
|
|
AnalyticsHTML template.HTML // Optional analytics HTML to insert at the beginning of <head>.
|
|
|
|
HomeArticles int // Articles to display on the home page.
|
|
FeedArticles int // Articles to include in Atom and JSON feeds.
|
|
FeedTitle string // The title of the Atom XML feed
|
|
|
|
PlayEnabled bool
|
|
ServeLocalLinks bool // rewrite golang.org/{pkg,cmd} links to host-less, relative paths.
|
|
}
|
|
|
|
// Doc represents an article adorned with presentation data.
|
|
type Doc struct {
|
|
*present.Doc
|
|
Permalink string // Canonical URL for this document.
|
|
Path string // Path relative to server root (including base).
|
|
HTML template.HTML // rendered article
|
|
|
|
Related []*Doc
|
|
Newer, Older *Doc
|
|
}
|
|
|
|
// Server implements an http.Handler that serves blog articles.
|
|
type Server struct {
|
|
cfg Config
|
|
docs []*Doc
|
|
tags []string
|
|
docPaths map[string]*Doc // key is path without BasePath.
|
|
docTags map[string][]*Doc
|
|
template struct {
|
|
home, index, article, doc *template.Template
|
|
}
|
|
atomFeed []byte // pre-rendered Atom feed
|
|
jsonFeed []byte // pre-rendered JSON feed
|
|
content http.Handler
|
|
}
|
|
|
|
// NewServer constructs a new Server using the specified config.
|
|
func NewServer(cfg Config) (*Server, error) {
|
|
present.PlayEnabled = cfg.PlayEnabled
|
|
|
|
if notExist(cfg.TemplatePath) {
|
|
return nil, fmt.Errorf("template directory not found: %s", cfg.TemplatePath)
|
|
}
|
|
root := filepath.Join(cfg.TemplatePath, "root.tmpl")
|
|
parse := func(name string) (*template.Template, error) {
|
|
path := filepath.Join(cfg.TemplatePath, name)
|
|
if notExist(path) {
|
|
return nil, fmt.Errorf("template %s was not found in %s", name, cfg.TemplatePath)
|
|
}
|
|
t := template.New("").Funcs(funcMap)
|
|
return t.ParseFiles(root, path)
|
|
}
|
|
|
|
s := &Server{cfg: cfg}
|
|
|
|
// Parse templates.
|
|
var err error
|
|
s.template.home, err = parse("home.tmpl")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s.template.index, err = parse("index.tmpl")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s.template.article, err = parse("article.tmpl")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
p := present.Template().Funcs(funcMap)
|
|
s.template.doc, err = p.ParseFiles(filepath.Join(cfg.TemplatePath, "doc.tmpl"))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Load content.
|
|
err = s.loadDocs(filepath.Clean(cfg.ContentPath))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = s.renderAtomFeed()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
err = s.renderJSONFeed()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// Set up content file server.
|
|
s.content = http.StripPrefix(s.cfg.BasePath, http.FileServer(http.Dir(cfg.ContentPath)))
|
|
|
|
return s, nil
|
|
}
|
|
|
|
var funcMap = template.FuncMap{
|
|
"sectioned": sectioned,
|
|
"authors": authors,
|
|
}
|
|
|
|
// sectioned returns true if the provided Doc contains more than one section.
|
|
// This is used to control whether to display the table of contents and headings.
|
|
func sectioned(d *present.Doc) bool {
|
|
return len(d.Sections) > 1
|
|
}
|
|
|
|
// authors returns a comma-separated list of author names.
|
|
func authors(authors []present.Author) string {
|
|
var b bytes.Buffer
|
|
last := len(authors) - 1
|
|
for i, a := range authors {
|
|
if i > 0 {
|
|
if i == last {
|
|
b.WriteString(" and ")
|
|
} else {
|
|
b.WriteString(", ")
|
|
}
|
|
}
|
|
b.WriteString(authorName(a))
|
|
}
|
|
return b.String()
|
|
}
|
|
|
|
// authorName returns the first line of the Author text: the author's name.
|
|
func authorName(a present.Author) string {
|
|
el := a.TextElem()
|
|
if len(el) == 0 {
|
|
return ""
|
|
}
|
|
text, ok := el[0].(present.Text)
|
|
if !ok || len(text.Lines) == 0 {
|
|
return ""
|
|
}
|
|
return text.Lines[0]
|
|
}
|
|
|
|
// loadDocs reads all content from the provided file system root, renders all
|
|
// the articles it finds, adds them to the Server's docs field, computes the
|
|
// denormalized docPaths, docTags, and tags fields, and populates the various
|
|
// helper fields (Next, Previous, Related) for each Doc.
|
|
func (s *Server) loadDocs(root string) error {
|
|
// Read content into docs field.
|
|
const ext = ".article"
|
|
fn := func(p string, info os.FileInfo, err error) error {
|
|
if filepath.Ext(p) != ext {
|
|
return nil
|
|
}
|
|
f, err := os.Open(p)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
d, err := present.Parse(f, p, 0)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var html bytes.Buffer
|
|
err = d.Render(&html, s.template.doc)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
p = p[len(root) : len(p)-len(ext)] // trim root and extension
|
|
p = filepath.ToSlash(p)
|
|
s.docs = append(s.docs, &Doc{
|
|
Doc: d,
|
|
Path: s.cfg.BasePath + p,
|
|
Permalink: s.cfg.BaseURL + p,
|
|
HTML: template.HTML(html.String()),
|
|
})
|
|
return nil
|
|
}
|
|
err := filepath.Walk(root, fn)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
sort.Sort(docsByTime(s.docs))
|
|
|
|
// Pull out doc paths and tags and put in reverse-associating maps.
|
|
s.docPaths = make(map[string]*Doc)
|
|
s.docTags = make(map[string][]*Doc)
|
|
for _, d := range s.docs {
|
|
s.docPaths[strings.TrimPrefix(d.Path, s.cfg.BasePath)] = d
|
|
for _, t := range d.Tags {
|
|
s.docTags[t] = append(s.docTags[t], d)
|
|
}
|
|
}
|
|
|
|
// Pull out unique sorted list of tags.
|
|
for t := range s.docTags {
|
|
s.tags = append(s.tags, t)
|
|
}
|
|
sort.Strings(s.tags)
|
|
|
|
// Set up presentation-related fields, Newer, Older, and Related.
|
|
for _, doc := range s.docs {
|
|
// Newer, Older: docs adjacent to doc
|
|
for i := range s.docs {
|
|
if s.docs[i] != doc {
|
|
continue
|
|
}
|
|
if i > 0 {
|
|
doc.Newer = s.docs[i-1]
|
|
}
|
|
if i+1 < len(s.docs) {
|
|
doc.Older = s.docs[i+1]
|
|
}
|
|
break
|
|
}
|
|
|
|
// Related: all docs that share tags with doc.
|
|
related := make(map[*Doc]bool)
|
|
for _, t := range doc.Tags {
|
|
for _, d := range s.docTags[t] {
|
|
if d != doc {
|
|
related[d] = true
|
|
}
|
|
}
|
|
}
|
|
for d := range related {
|
|
doc.Related = append(doc.Related, d)
|
|
}
|
|
sort.Sort(docsByTime(doc.Related))
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// renderAtomFeed generates an XML Atom feed and stores it in the Server's
|
|
// atomFeed field.
|
|
func (s *Server) renderAtomFeed() error {
|
|
var updated time.Time
|
|
if len(s.docs) > 0 {
|
|
updated = s.docs[0].Time
|
|
}
|
|
feed := atom.Feed{
|
|
Title: s.cfg.FeedTitle,
|
|
ID: "tag:" + s.cfg.Hostname + ",2013:" + s.cfg.Hostname,
|
|
Updated: atom.Time(updated),
|
|
Link: []atom.Link{{
|
|
Rel: "self",
|
|
Href: s.cfg.BaseURL + "/feed.atom",
|
|
}},
|
|
}
|
|
for i, doc := range s.docs {
|
|
if i >= s.cfg.FeedArticles {
|
|
break
|
|
}
|
|
e := &atom.Entry{
|
|
Title: doc.Title,
|
|
ID: feed.ID + doc.Path,
|
|
Link: []atom.Link{{
|
|
Rel: "alternate",
|
|
Href: doc.Permalink,
|
|
}},
|
|
Published: atom.Time(doc.Time),
|
|
Updated: atom.Time(doc.Time),
|
|
Summary: &atom.Text{
|
|
Type: "html",
|
|
Body: summary(doc),
|
|
},
|
|
Content: &atom.Text{
|
|
Type: "html",
|
|
Body: string(doc.HTML),
|
|
},
|
|
Author: &atom.Person{
|
|
Name: authors(doc.Authors),
|
|
},
|
|
}
|
|
feed.Entry = append(feed.Entry, e)
|
|
}
|
|
data, err := xml.Marshal(&feed)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.atomFeed = data
|
|
return nil
|
|
}
|
|
|
|
type jsonItem struct {
|
|
Title string
|
|
Link string
|
|
Time time.Time
|
|
Summary string
|
|
Content string
|
|
Author string
|
|
}
|
|
|
|
// renderJSONFeed generates a JSON feed and stores it in the Server's jsonFeed
|
|
// field.
|
|
func (s *Server) renderJSONFeed() error {
|
|
var feed []jsonItem
|
|
for i, doc := range s.docs {
|
|
if i >= s.cfg.FeedArticles {
|
|
break
|
|
}
|
|
item := jsonItem{
|
|
Title: doc.Title,
|
|
Link: doc.Permalink,
|
|
Time: doc.Time,
|
|
Summary: summary(doc),
|
|
Content: string(doc.HTML),
|
|
Author: authors(doc.Authors),
|
|
}
|
|
feed = append(feed, item)
|
|
}
|
|
data, err := json.Marshal(feed)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.jsonFeed = data
|
|
return nil
|
|
}
|
|
|
|
// summary returns the first paragraph of text from the provided Doc.
|
|
func summary(d *Doc) string {
|
|
if len(d.Sections) == 0 {
|
|
return ""
|
|
}
|
|
for _, elem := range d.Sections[0].Elem {
|
|
text, ok := elem.(present.Text)
|
|
if !ok || text.Pre {
|
|
// skip everything but non-text elements
|
|
continue
|
|
}
|
|
var buf bytes.Buffer
|
|
for _, s := range text.Lines {
|
|
buf.WriteString(string(present.Style(s)))
|
|
buf.WriteByte('\n')
|
|
}
|
|
return buf.String()
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// rootData encapsulates data destined for the root template.
|
|
type rootData struct {
|
|
Doc *Doc
|
|
BasePath string
|
|
GodocURL string
|
|
AnalyticsHTML template.HTML
|
|
Data interface{}
|
|
}
|
|
|
|
// ServeHTTP serves the front, index, and article pages
|
|
// as well as the ATOM and JSON feeds.
|
|
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
var (
|
|
d = rootData{
|
|
BasePath: s.cfg.BasePath,
|
|
GodocURL: s.cfg.GodocURL,
|
|
AnalyticsHTML: s.cfg.AnalyticsHTML,
|
|
}
|
|
t *template.Template
|
|
)
|
|
switch p := strings.TrimPrefix(r.URL.Path, s.cfg.BasePath); p {
|
|
case "/":
|
|
d.Data = s.docs
|
|
if len(s.docs) > s.cfg.HomeArticles {
|
|
d.Data = s.docs[:s.cfg.HomeArticles]
|
|
}
|
|
t = s.template.home
|
|
case "/index":
|
|
d.Data = s.docs
|
|
t = s.template.index
|
|
case "/feed.atom", "/feeds/posts/default":
|
|
w.Header().Set("Content-type", "application/atom+xml; charset=utf-8")
|
|
w.Write(s.atomFeed)
|
|
return
|
|
case "/.json":
|
|
if p := r.FormValue("jsonp"); validJSONPFunc.MatchString(p) {
|
|
w.Header().Set("Content-type", "application/javascript; charset=utf-8")
|
|
fmt.Fprintf(w, "%v(%s)", p, s.jsonFeed)
|
|
return
|
|
}
|
|
w.Header().Set("Content-type", "application/json; charset=utf-8")
|
|
w.Write(s.jsonFeed)
|
|
return
|
|
default:
|
|
doc, ok := s.docPaths[p]
|
|
if !ok {
|
|
// Not a doc; try to just serve static content.
|
|
s.content.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
d.Doc = doc
|
|
t = s.template.article
|
|
}
|
|
var err error
|
|
if s.cfg.ServeLocalLinks {
|
|
var buf bytes.Buffer
|
|
err = t.ExecuteTemplate(&buf, "root", d)
|
|
if err != nil {
|
|
log.Println(err)
|
|
return
|
|
}
|
|
_, err = golangOrgAbsLinkReplacer.WriteString(w, buf.String())
|
|
} else {
|
|
err = t.ExecuteTemplate(w, "root", d)
|
|
}
|
|
if err != nil {
|
|
log.Println(err)
|
|
}
|
|
}
|
|
|
|
// docsByTime implements sort.Interface, sorting Docs by their Time field.
|
|
type docsByTime []*Doc
|
|
|
|
func (s docsByTime) Len() int { return len(s) }
|
|
func (s docsByTime) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
|
func (s docsByTime) Less(i, j int) bool { return s[i].Time.After(s[j].Time) }
|
|
|
|
// notExist reports whether the path exists or not.
|
|
func notExist(path string) bool {
|
|
_, err := os.Stat(path)
|
|
return os.IsNotExist(err)
|
|
}
|