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web.go
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package main
// Copyright (C) 2013 Alexander Bauer, Luke Evers, Dylan Whichard,
// and contributors; (GPLv3) see LICENSE or doc.go
import (
"encoding/xml"
"errors"
"github.com/baliw/moverss"
"github.com/dchest/captcha"
"github.com/russross/blackfriday"
"html/template"
"net"
"net/http"
"os"
"path"
"strings"
"time"
)
var (
NodeRSS *moverss.Channel
NodeXMLName xml.Name
)
var (
listener net.Listener
captchaServer = captcha.Server(captcha.StdWidth, captcha.StdHeight)
)
var (
InvalidBindAddress = errors.New("invalid address to bind to")
InvalidCAPTCHAFormat = errors.New("CAPTCHA format invalid")
IncorrectCAPTCHA = errors.New("CAPTCHA ID or solution is incorrect")
)
// StartServer is a simple helper function to register any handlers
// (such as the API) and start the HTTP server on the configured
// address (Conf.Web.Addr).
//
// If Conf.Web.Prefix or Conf.Web.DeproxyHeaderFields has a length
// greater than zero, it wraps its http.ServeMux with a Deproxier.
//
// On crash, it returns the error.
func StartServer() (err error) {
// Register any handlers.
RegisterAPI(Conf.Web.Prefix)
l.Debug("Registered API handler\n")
err = RegisterTemplates()
if err != nil {
return
}
// Parse the address and create an appropriate net.Listener. The
// Web.Addr will be of the form "protocol://address:port".
parts := strings.Split(Conf.Web.Addr, "://")
if len(parts) != 2 {
return InvalidBindAddress
}
listener, err = net.Listen(parts[0], parts[1])
if err != nil {
return
}
// Change permissions for unix socket to be 770, so that web servers can
// write to it
if parts[0] == "unix" {
l.Infof("Changing permissions for %q to 770\n", parts[1])
err = os.Chmod(parts[1], 0770)
if err != nil {
return
}
}
// Create a custom http.Server, so that we can have better control
// over certain behaviors.
s := &http.Server{}
// If either the Prefix or DeproxyHeaderFields are set, then we
// need to wrap the default Handler with a Deproxier. Otherwise,
// we just use our Handler.
if len(Conf.Web.Prefix) > 0 || len(Conf.Web.DeproxyHeaderFields) > 0 {
s.Handler = &Deproxier{http.DefaultServeMux}
} else {
s.Handler = &Handler{http.DefaultServeMux}
}
// We need to set the database tile store.
captcha.SetCustomStore(CAPTCHAStore{})
http.HandleFunc("/", HandleStatic)
http.HandleFunc("/node/", HandleMap)
http.HandleFunc("/verify/", HandleMap)
http.Handle("/captcha/", captchaServer)
// Start the HTTP server and return any errors if it crashes.
l.Infof("Starting HTTP server on %q\n", Conf.Web.Addr)
return s.Serve(listener)
}
// HandleStatic serves files directly from <StaticDir>/web using
// http.ServeFile().
func HandleStatic(w http.ResponseWriter, req *http.Request) {
http.ServeFile(w, req, path.Join(StaticDir, "web", req.URL.Path))
}
// HandleMap always serves <StaticDir>/web/index.html.
func HandleMap(w http.ResponseWriter, req *http.Request) {
http.ServeFile(w, req, path.Join(StaticDir, "web", "index.html"))
}
// Handler acts is a simple http.Handler which performs some cleanup
// on the Request before passing it on to its underlying
// http.ServeMux.
type Handler struct {
Mux *http.ServeMux
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
r.RemoteAddr, _, _ = net.SplitHostPort(r.RemoteAddr)
h.Mux.ServeHTTP(w, r)
}
// Deproxier implements the http.Handler interface by setting the
// http.Request.RemoteAddr to the appropriate header field, if
// set, then passing the request on to its underlying http.ServeMux.
//
// It interprets the following header fields as a real remote address,
// in this order.
// X-Proxied-For
// X-Real-Ip
type Deproxier struct {
Mux *http.ServeMux
}
func (d *Deproxier) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Check the acceptable header fields in order, checking if each
// one is present. If so, set the r.RemoteAddr to its first value
// and break out of the loop.
for _, fieldname := range Conf.Web.DeproxyHeaderFields {
if realip, ok := r.Header[fieldname]; ok {
r.RemoteAddr = realip[0]
break
}
}
// Finally, pass the request on to the underlying http.ServeMux.
d.Mux.ServeHTTP(w, r)
}
// RegisterTemplates loads templates from <StaticDir>/email/*.txt into
// the global variable t.
func RegisterTemplates() (err error) {
t = template.New("")
t.Funcs(template.FuncMap{
"markdownify": func(s string) template.HTML {
return template.HTML(
string(blackfriday.MarkdownBasic([]byte(s))))
},
})
t, err = t.ParseGlob(path.Join(StaticDir, "email/*.txt"))
return
}
// CleanNodeRSS recreates the node RSS feed from scratch using the
// database and logs any errors.
func CleanNodeRSS() {
NodeRSS = moverss.ChannelFactory(
Conf.Name+" NodeAtlas",
Conf.Web.Hostname,
"New local node feed")
NodeXMLName = xml.Name{
Space: Conf.Web.Hostname,
Local: "nodes",
}
// We use a separate query here so that we can retrieve only the
// fields we need, and only nodes newer than RSS.MaxAge ago.
rows, err := Db.Query(`
SELECT updated,address,owner
FROM nodes
WHERE updated >= ?;`, time.Now().Add(time.Duration(-Conf.Web.RSS.MaxAge)))
if err != nil {
l.Errf("Error getting nodes from database: %s", err)
return
}
defer rows.Close()
for rows.Next() {
// Initialize the variables.
var updated int64
node := new(Node)
// Scan all of the values into them.
err = rows.Scan(&updated, &node.Addr, &node.OwnerName)
if err != nil {
l.Errf("Error getting nodes from database: %s", err)
return
}
// Add the Node to the RSS feed.
in := node.Item()
in.SetPubDate(time.Unix(updated, 0))
NodeRSS.AddItem(in)
}
// Write the feed to the file, and log any errors.
WriteNodeRSS()
return
}
// AddNodeToRSS adds a Node to the existing NodeRSS channel with the
// given time and invokes WriteNodeRSS to write it to a file and log
// any errors.
func AddNodeToRSS(n *Node, t time.Time) {
in := n.Item()
in.SetPubDate(t)
NodeRSS.AddItem(in)
WriteNodeRSS()
}
func WriteNodeRSS() {
f, err := os.Create(StaticDir + "/web/index.rss")
if err != nil {
l.Errf("Error writing NodeRSS feed: %s", err)
}
f.Write(NodeRSS.Publish())
f.Close()
}