func main() {
log.SetFlags(0)
ctxt := fs.NewContext(new(http.Request))
if err := dashboard.Update(ctxt, nil, "Go 1.2"); err != nil {
log.Fatal(err)
}
log.Print("OK")
}
func makeImage(req *http.Request, caption, font string, pt, size, border, scale int, f func(x, y int) uint32) *image.RGBA {
d := (size + 2*border) * scale
csize := 0
if caption != "" {
if pt == 0 {
pt = 11
}
csize = pt * 2
}
c := image.NewRGBA(image.Rect(0, 0, d, d+csize))
// white
u := &image.Uniform{C: color.White}
draw.Draw(c, c.Bounds(), u, image.ZP, draw.Src)
for y := 0; y < size; y++ {
for x := 0; x < size; x++ {
r := image.Rect((x+border)*scale, (y+border)*scale, (x+border+1)*scale, (y+border+1)*scale)
rgba := f(x, y)
u.C = color.RGBA{byte(rgba >> 24), byte(rgba >> 16), byte(rgba >> 8), byte(rgba)}
draw.Draw(c, r, u, image.ZP, draw.Src)
}
}
if csize != 0 {
if font == "" {
font = "data/luxisr.ttf"
}
ctxt := fs.NewContext(req)
dat, _, err := ctxt.Read(font)
if err != nil {
panic(err)
}
tfont, err := freetype.ParseFont(dat)
if err != nil {
panic(err)
}
ft := freetype.NewContext()
ft.SetDst(c)
ft.SetDPI(100)
ft.SetFont(tfont)
ft.SetFontSize(float64(pt))
ft.SetSrc(image.NewUniform(color.Black))
ft.SetClip(image.Rect(0, 0, 0, 0))
wid, err := ft.DrawString(caption, freetype.Pt(0, 0))
if err != nil {
panic(err)
}
p := freetype.Pt(d, d+3*pt/2)
p.X -= wid.X
p.X /= 2
ft.SetClip(c.Bounds())
ft.DrawString(caption, p)
}
return c
}
func AdminDashboard(w http.ResponseWriter, req *http.Request) {
version := "Go " + strings.TrimPrefix(req.URL.Path, "/admin/dashboard/")
ctxt := fs.NewContext(req)
ctxt.Mkdir("issue-dashboard")
c := appengine.NewContext(req)
if err := dashboard.Update(ctxt, urlfetch.Client(c), version); err != nil {
fmt.Fprintf(w, "Error updating: %s\n", err)
} else {
fmt.Fprintf(w, "Updated.\n")
}
}
// Show is the handler for showing a stored QR code.
func Show(w http.ResponseWriter, req *http.Request) {
ctxt := fs.NewContext(req)
tag := req.URL.Path[len("/qr/show/"):]
png := strings.HasSuffix(tag, ".png")
if png {
tag = tag[:len(tag)-len(".png")]
}
if !isTagName(tag) {
fmt.Fprintf(w, "Sorry, QR code not found\n")
return
}
if req.FormValue("flag") == "1" {
flag(w, req, tag, ctxt)
return
}
data, _, err := ctxt.Read("qrsave/" + tag)
if err != nil {
fmt.Fprintf(w, "Sorry, QR code not found.\n")
return
}
var m Image
if err := json.Unmarshal(data, &m); err != nil {
panic(err)
}
m.Tag = tag
switch req.FormValue("size") {
case "big":
m.Scale *= 2
case "small":
m.Scale /= 2
}
if png {
if err := m.Encode(req); err != nil {
panic(err)
return
}
w.Header().Set("Cache-Control", "public, max-age=3600")
w.Write(m.Code.PNG())
return
}
w.Header().Set("Cache-Control", "public, max-age=300")
runTemplate(ctxt, w, "qr/permalink.html", &m)
}
// toc traverses the file system to build the list of posts
func toc(w http.ResponseWriter, req *http.Request, draft bool, isOwner bool, user string) {
c := fs.NewContext(req)
c.Criticalf("toc() draft=%v isOwner=%v user=%s", draft, isOwner, user)
// ☻ Compute cache key for this page
var data []byte
keystr := fmt.Sprintf("blog:toc:%v", draft) // Key schema: "blog:toc:{true|false}" draft|non-draft
if req.FormValue("readdir") != "" {
keystr += ",readdir=" + req.FormValue("readdir") // If "readdir:" form value is given, add to cache key
}
if draft {
keystr += ",user="******"blog", &data); ok {
w.Write(data)
} else {
gentoc(w, req, key, draft, isOwner, user)
}
}
func Dashboard(w http.ResponseWriter, req *http.Request) {
httpCache(w, 5*time.Minute)
ctxt := fs.NewContext(req)
ctxt.ServeFile(w, req, "issue-dashboard/"+strings.TrimPrefix(req.URL.Path, "/dashboard/"))
}
func upload(w http.ResponseWriter, req *http.Request, link string) {
// Upload of a new image.
// Copied from Moustachio demo.
f, _, err := req.FormFile("image")
if err != nil {
fmt.Fprintf(w, "You need to select an image to upload.\n")
return
}
defer f.Close()
i, _, err := image.Decode(f)
if err != nil {
panic(err)
}
// Convert image to 128x128 gray+alpha.
b := i.Bounds()
const max = 128
// If it's gigantic, it's more efficient to downsample first
// and then resize; resizing will smooth out the roughness.
var i1 *image.RGBA
if b.Dx() > 4*max || b.Dy() > 4*max {
w, h := 2*max, 2*max
if b.Dx() > b.Dy() {
h = b.Dy() * h / b.Dx()
} else {
w = b.Dx() * w / b.Dy()
}
i1 = resize.Resample(i, b, w, h)
} else {
// "Resample" to same size, just to convert to RGBA.
i1 = resize.Resample(i, b, b.Dx(), b.Dy())
}
b = i1.Bounds()
// Encode to PNG.
dx, dy := 128, 128
if b.Dx() > b.Dy() {
dy = b.Dy() * dx / b.Dx()
} else {
dx = b.Dx() * dy / b.Dy()
}
i128 := resize.ResizeRGBA(i1, i1.Bounds(), dx, dy)
var buf bytes.Buffer
if err := png.Encode(&buf, i128); err != nil {
panic(err)
}
h := md5.New()
h.Write(buf.Bytes())
tag := fmt.Sprintf("%x", h.Sum(nil))[:32]
ctxt := fs.NewContext(req)
if err := ctxt.Write("qr/upload/"+tag+".png", buf.Bytes()); err != nil {
panic(err)
}
// Redirect with new image tag.
// Redirect to draw with new image tag.
http.Redirect(w, req, req.URL.Path+"?"+url.Values{"i": {tag}, "url": {link}}.Encode(), 302)
}
// Draw is the handler for drawing a QR code.
func Draw(w http.ResponseWriter, req *http.Request) {
ctxt := fs.NewContext(req)
url := req.FormValue("url")
if url == "" {
url = "http://swtch.com/qr"
}
if req.FormValue("upload") == "1" {
upload(w, req, url)
return
}
t0 := time.Now()
img := req.FormValue("i")
if !isImgName(img) {
img = "pjw"
}
if req.FormValue("show") == "png" {
i := loadSize(ctxt, img, 48)
var buf bytes.Buffer
png.Encode(&buf, i)
w.Write(buf.Bytes())
return
}
if req.FormValue("flag") == "1" {
flag(w, req, img, ctxt)
return
}
if req.FormValue("x") == "" {
var data = struct {
Name string
URL string
}{
Name: img,
URL: url,
}
runTemplate(ctxt, w, "qr/main.html", &data)
return
}
arg := func(s string) int { x, _ := strconv.Atoi(req.FormValue(s)); return x }
targ := makeTarg(ctxt, img, 17+4*arg("v")+arg("z"))
m := &Image{
Name: img,
Dx: arg("x"),
Dy: arg("y"),
URL: req.FormValue("u"),
Version: arg("v"),
Mask: arg("m"),
RandControl: arg("r") > 0,
Dither: arg("i") > 0,
OnlyDataBits: arg("d") > 0,
SaveControl: arg("c") > 0,
Scale: arg("scale"),
Target: targ,
Seed: int64(arg("s")),
Rotation: arg("o"),
Size: arg("z"),
}
if m.Version > 8 {
m.Version = 8
}
if m.Scale == 0 {
if arg("l") > 1 {
m.Scale = 8
} else {
m.Scale = 4
}
}
if m.Version >= 12 && m.Scale >= 4 {
m.Scale /= 2
}
if arg("l") == 1 {
data, err := json.Marshal(m)
if err != nil {
panic(err)
}
h := md5.New()
h.Write(data)
tag := fmt.Sprintf("%x", h.Sum(nil))[:16]
if err := ctxt.Write("qrsave/"+tag, data); err != nil {
panic(err)
}
http.Redirect(w, req, "/qr/show/"+tag, http.StatusTemporaryRedirect)
return
}
if err := m.Encode(req); err != nil {
fmt.Fprintf(w, "%s\n", err)
return
}
var dat []byte
switch {
case m.SaveControl:
dat = m.Control
default:
dat = m.Code.PNG()
}
if arg("l") > 0 {
w.Header().Set("Content-Type", "image/png")
w.Write(dat)
return
}
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprint(w, "<center><img src=\"data:image/png;base64,")
io.WriteString(w, base64.StdEncoding.EncodeToString(dat))
fmt.Fprint(w, "\" /><br>")
fmt.Fprintf(w, "<form method=\"POST\" action=\"%s&l=1\"><input type=\"submit\" value=\"Save this QR code\"></form>\n", m.Link())
fmt.Fprintf(w, "</center>\n")
fmt.Fprintf(w, "<br><center><font size=-1>%v</font></center>\n", time.Now().Sub(t0))
}
func atomfeed(w http.ResponseWriter, req *http.Request) {
c := fs.NewContext(req)
c.Criticalf("Header: %v", req.Header)
var data []byte
if key, ok := c.CacheLoad("blog:atomfeed", "blog/post", &data); !ok {
dir, err := c.ReadDir("blog/post")
if err != nil {
panic(err)
}
var all []*PostData
for _, d := range dir {
meta, article, err := loadPost(c, d.Name, req)
if err != nil {
// Should not happen: we just loaded the directory.
panic(err)
}
if meta.IsDraft() {
continue
}
meta.article = article
all = append(all, meta)
}
sort.Sort(byTime(all))
show := all
if len(show) > 10 {
show = show[:10]
for _, meta := range all[10:] {
if meta.Favorite {
show = append(show, meta)
}
}
}
//
// Title
// ID
// Updated
// Author
// Name
// URI
// Email
// Link[]
// Rel
// Href
feed := &atom.Feed{
Title: config.FeedTitle,
ID: config.FeedID,
Updated: atom.Time(show[0].Date.Time),
Author: &atom.Person{
Name: config.Name,
URI: "https://plus.google.com/" + config.PlusID,
Email: config.Email,
},
Link: []atom.Link{
{Rel: "self", Href: hostURL(req) + "/feed.atom"},
},
}
for _, meta := range show {
t := template.New("main")
t.Funcs(funcMap)
main, _, err := c.Read("blog/atom.html")
if err != nil {
panic(err)
}
_, err = t.Parse(string(main))
if err != nil {
panic(err)
}
template.Must(t.New("article").Parse(meta.article))
var buf bytes.Buffer
if err := t.Execute(&buf, meta); err != nil {
panic(err)
}
e := &atom.Entry{
Title: meta.Title,
ID: feed.ID + "/" + meta.Name,
Link: []atom.Link{
{Rel: "alternate", Href: meta.HostURL + "/" + meta.Name},
},
Published: atom.Time(meta.Date.Time),
Updated: atom.Time(meta.Date.Time),
Summary: &atom.Text{
Type: "text",
Body: meta.Summary,
},
Content: &atom.Text{
Type: "html",
Body: buf.String(),
},
}
feed.Entry = append(feed.Entry, e)
}
data, err = xml.Marshal(&feed)
if err != nil {
panic(err)
}
c.CacheStore(key, data)
}
// Feed readers like to hammer us; let Google cache the
// response to reduce the traffic we have to serve.
httpCache(w, 15*time.Minute)
w.Header().Set("Content-Type", "application/atom+xml")
w.Write(data)
}
// ☻ Rebuild the TOC page, used on cache misses in toc.
func gentoc(w http.ResponseWriter, req *http.Request, key fs.CacheKey, draft, isOwner bool, user string) {
var data []byte
c := fs.NewContext(req)
// ☻ Traverse "/blog/post/..." and its descendants
dir, err := readDirEllipses(c, "blog/post")
if err != nil {
panic(err)
}
// ☻ If "readdir: 1" form field supplied, return number of files
if req.FormValue("readdir") == "1" {
fmt.Fprintf(w, "%d dir entries\n", len(dir))
return
}
// ☻ Read postName–>postData from file "/blogcache", if any available
postCache := map[string]*PostData{}
if data, _, err := c.Read("blogcache"); err == nil {
if err := json.Unmarshal(data, &postCache); err != nil {
c.Criticalf("unmarshal blogcache: %v", err)
}
}
ch := make(chan *PostData, len(dir)) // ☻ Create a channel whose buffer size equals the number of files in "blog/post"
// XXX: This is a limiting mechanism. Use limiter.
const par = 20
var limit = make(chan bool, par) // Insert 20 tickets
for i := 0; i < par; i++ {
limit <- true
}
//
for _, d := range dir { // For each file in directory,
if meta := postCache[d.Name]; meta != nil && // Attempt to fetch post meta from "blogcache" file cache; if present, and
meta.FileModTime.Equal(d.ModTime) && // The cache copy is not older than the original, and
meta.FileSize == d.Size { // They match in size
//
ch <- meta // Use the cached post meta
continue
}
<-limit
go func(d proto.FileInfo) { // Fetch post in parallel
defer func() { limit <- true }()
meta, _, err := loadPost(c, d.Name, req)
if err != nil {
// Should not happen: we just listed the directory.
c.Criticalf("loadPost %s: %v", d.Name, err)
return
}
ch <- meta
}(d)
}
for i := 0; i < par; i++ { // Wait for all post loads to complete
<-limit
}
close(ch) // Write eof
postCache = map[string]*PostData{} // ☻ Update postCache with the fresh data and apply permission/draft filters
var all []*PostData
for meta := range ch {
postCache[meta.Name] = meta
if (!draft && !meta.IsDraft() && !meta.NotInTOC) || (isOwner && draft) || meta.canRead(user) {
all = append(all, meta)
}
}
sort.Sort(byTime(all)) // ☻ Sort posts chronologically
if data, err := json.Marshal(postCache); err != nil { // ☻ Write new TOC cache to "/blogcache"
c.Criticalf("marshal blogcache: %v", err)
} else if err := c.Write("blogcache", data); err != nil {
c.Criticalf("write blogcache: %v", err)
}
var buf bytes.Buffer // ☻ Render TOC page
t := mainTemplate(c)
if err := t.Lookup("toc").Execute(&buf, &TocData{
User: c.User(),
Draft: draft,
HostURL: hostURL(req),
DraftRoot: "/draft",
PostRoot: "/",
Posts: all,
}); err != nil {
panic(err)
}
data = buf.Bytes()
c.CacheStore(key, data)
//
w.Write(data)
}
func serve(w http.ResponseWriter, req *http.Request) {
ctxt := fs.NewContext(req)
ctxt.Criticalf("SERVING %s", req.URL.Path)
// If a panic occurs in the user logic,
// catch it, log it and return a 500 error.
defer func() {
if err := recover(); err != nil {
var buf bytes.Buffer
fmt.Fprintf(&buf, "panic: %s\n\n", err)
buf.Write(debug.Stack())
ctxt.Criticalf("%s", buf.String())
http.Error(w, buf.String(), 500)
}
}()
p := path.Clean("/" + req.URL.Path)
// ☻ If the site is accessed via its appspot URL, redirect to the cutsom URL
// to make sure links on the site are not broken.
// if strings.Contains(req.Host, "appspot.com") {
// http.Redirect(w, req, "http://research.swtch.com" + p, http.StatusFound)
// }
// ☻ Correct paths missing the root slash
if p != req.URL.Path {
http.Redirect(w, req, p, http.StatusFound)
return
}
// ☻ Serve atom feed requests
if p == "/feed.atom" {
atomfeed(w, req)
return
}
// ☻ Determine whether logged user is guest or owner
user := ctxt.User()
// isOwner = owner in AppEngine
isOwner := aeu.IsAdmin(ae.NewContext(req)) || ctxt.User() == config.Account
// ☻ If URL signifies the TOC page
if p == "" || p == "/" || p == "/draft" {
if p == "/draft" && user == "?" { // ☻ Prevent non-owners from viewing draft TOC pages
ctxt.Criticalf("/draft loaded by %s", user)
notfound(ctxt, w, req)
return
}
toc(w, req, p == "/draft", isOwner, user) // Render
return
}
// draft = we are in draft mode, and only if we have credentials
draft := false
if strings.HasPrefix(p, "/draft/") {
if user == "?" {
ctxt.Criticalf("/draft loaded by %s", user)
notfound(ctxt, w, req)
return
}
draft = true
p = p[len("/draft"):]
}
/*
// There are no valid URLs with slashes after the root or draft part of the URL.
// We disable this, since we would like to be able to serve the whole MathJax tree statically.
if strings.Contains(p[1:], "/") {
notfound(ctxt, w, req)
return
}
*/
// If the path contains dots, it is interpreted as a static file
if strings.Contains(p, ".") {
// Let Google's front end servers cache static content for a short amount of time.
// httpCache simply adds a caching directive in the HTTP response
// Disable temporarily while fiddling with CSS files
//httpCache(w, 5*time.Minute)
ctxt.ServeFile(w, req, "blog/static/"+p)
return
}
// Use just 'blog' as the cache path so that if we change
// templates, all the cached HTML gets invalidated.
var data []byte
pp := "bloghtml:" + p
if draft && !isOwner {
pp += ",user="******"blog", &data); !ok {
meta, article, err := loadPost(ctxt, p, req)
if err != nil || meta.IsDraft() != draft || (draft && !isOwner && !meta.canRead(user)) {
ctxt.Criticalf("no %s for %s", p, user)
notfound(ctxt, w, req)
return
}
t := mainTemplate(ctxt)
template.Must(t.New("article").Parse(article))
var buf bytes.Buffer
meta.Comments = true
if err := t.Execute(&buf, meta); err != nil {
panic(err)
}
data = buf.Bytes()
ctxt.CacheStore(key, data)
}
w.Write(data)
}
func toc(w http.ResponseWriter, req *http.Request, draft bool, isOwner bool, user string) {
c := fs.NewContext(req)
var data []byte
keystr := fmt.Sprintf("blog:toc:%v", draft)
if req.FormValue("readdir") != "" {
keystr += ",readdir=" + req.FormValue("readdir")
}
if draft {
keystr += ",user="******"blog", &data); !ok {
c := fs.NewContext(req)
dir, err := c.ReadDir("blog/post")
if err != nil {
panic(err)
}
if req.FormValue("readdir") == "1" {
fmt.Fprintf(w, "%d dir entries\n", len(dir))
return
}
postCache := map[string]*PostData{}
if data, _, err := c.Read("blogcache"); err == nil {
if err := json.Unmarshal(data, &postCache); err != nil {
c.Criticalf("unmarshal blogcache: %v", err)
}
}
ch := make(chan *PostData, len(dir))
const par = 20
var limit = make(chan bool, par)
for i := 0; i < par; i++ {
limit <- true
}
for _, d := range dir {
if meta := postCache[d.Name]; meta != nil && meta.FileModTime.Equal(d.ModTime) && meta.FileSize == d.Size {
ch <- meta
continue
}
<-limit
go func(d proto.FileInfo) {
defer func() { limit <- true }()
meta, _, err := loadPost(c, d.Name, req)
if err != nil {
// Should not happen: we just listed the directory.
c.Criticalf("loadPost %s: %v", d.Name, err)
return
}
ch <- meta
}(d)
}
for i := 0; i < par; i++ {
<-limit
}
close(ch)
postCache = map[string]*PostData{}
var all []*PostData
for meta := range ch {
postCache[meta.Name] = meta
if meta.IsDraft() == draft && (!draft || isOwner || meta.canRead(user)) {
all = append(all, meta)
}
}
sort.Sort(byTime(all))
if data, err := json.Marshal(postCache); err != nil {
c.Criticalf("marshal blogcache: %v", err)
} else if err := c.Write("blogcache", data); err != nil {
c.Criticalf("write blogcache: %v", err)
}
var buf bytes.Buffer
t := mainTemplate(c)
if err := t.Lookup("toc").Execute(&buf, &TocData{draft, hostURL(req), all}); err != nil {
panic(err)
}
data = buf.Bytes()
c.CacheStore(key, data)
}
w.Write(data)
}
func serve(w http.ResponseWriter, req *http.Request) {
ctxt := fs.NewContext(req)
defer func() {
if err := recover(); err != nil {
var buf bytes.Buffer
fmt.Fprintf(&buf, "panic: %s\n\n", err)
buf.Write(debug.Stack())
ctxt.Criticalf("%s", buf.String())
http.Error(w, buf.String(), 500)
}
}()
p := path.Clean("/" + req.URL.Path)
/*
if strings.Contains(req.Host, "appspot.com") {
http.Redirect(w, req, "http://research.swtch.com" + p, http.StatusFound)
}
*/
if p != req.URL.Path {
http.Redirect(w, req, p, http.StatusFound)
return
}
if p == "/feed.atom" {
atomfeed(w, req)
return
}
if strings.HasPrefix(p, "/20") && strings.Contains(p[1:], "/") {
// Assume this is an old-style URL.
oldRedirect(ctxt, w, req, p)
}
user := ctxt.User()
isOwner := ctxt.User() == owner || len(os.Args) >= 2 && os.Args[1] == "LISTEN_STDIN"
if p == "" || p == "/" || p == "/draft" {
if p == "/draft" && user == "?" {
ctxt.Criticalf("/draft loaded by %s", user)
notfound(ctxt, w, req)
return
}
toc(w, req, p == "/draft", isOwner, user)
return
}
draft := false
if strings.HasPrefix(p, "/draft/") {
if user == "?" {
ctxt.Criticalf("/draft loaded by %s", user)
notfound(ctxt, w, req)
return
}
draft = true
p = p[len("/draft"):]
}
if strings.Contains(p[1:], "/") {
notfound(ctxt, w, req)
return
}
if strings.Contains(p, ".") {
// Let Google's front end servers cache static
// content for a short amount of time.
httpCache(w, 5*time.Minute)
ctxt.ServeFile(w, req, "blog/static/"+p)
return
}
// Use just 'blog' as the cache path so that if we change
// templates, all the cached HTML gets invalidated.
var data []byte
pp := "bloghtml:" + p
if draft && !isOwner {
pp += ",user="******"blog", &data); !ok {
meta, article, err := loadPost(ctxt, p, req)
if err != nil || meta.IsDraft() != draft || (draft && !isOwner && !meta.canRead(user)) {
ctxt.Criticalf("no %s for %s", p, user)
notfound(ctxt, w, req)
return
}
t := mainTemplate(ctxt)
template.Must(t.New("article").Parse(article))
var buf bytes.Buffer
meta.Comments = true
if err := t.Execute(&buf, meta); err != nil {
panic(err)
}
data = buf.Bytes()
ctxt.CacheStore(key, data)
}
w.Write(data)
}