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package server
import (
"bytes"
"encoding/base64"
"encoding/json"
"fmt"
"log"
"net"
"net/http"
"os"
"time"
"github.com/gobuffalo/packr"
"github.com/gorilla/handlers"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"github.com/pkg/errors"
"golang.org/x/oauth2"
"github.com/nsheridan/cashier/lib"
"github.com/nsheridan/cashier/server/auth/github"
"github.com/nsheridan/cashier/server/config"
"github.com/nsheridan/cashier/server/metrics"
"github.com/nsheridan/cashier/server/signer"
"github.com/sid77/drop"
)
// Run the server.
func Run(conf *config.Config) {
var err error
laddr := fmt.Sprintf("%s:%d", conf.Server.Addr, conf.Server.Port)
l, err := net.Listen("tcp", laddr)
if err != nil {
log.Fatal(errors.Wrapf(err, "unable to listen on %s:%d", conf.Server.Addr, conf.Server.Port))
}
if conf.Server.User != "" {
log.Print("Dropping privileges...")
if err := drop.DropPrivileges(conf.Server.User); err != nil {
log.Fatal(errors.Wrap(err, "unable to drop privileges"))
}
}
// Unprivileged section
metrics.Register()
authprovider, err := github.New(conf.Github)
if err != nil {
log.Fatal(errors.Wrap(err, "unable to setup github auth provider"))
}
keysigner, err := signer.New(conf.SSH)
if err != nil {
log.Fatal(err)
}
ctx := &app{
cookiestore: sessions.NewCookieStore([]byte(conf.Server.CookieSecret)),
keysigner: keysigner,
authprovider: authprovider,
config: conf.Server,
router: mux.NewRouter(),
}
ctx.cookiestore.Options = &sessions.Options{
MaxAge: 900,
Path: "/",
Secure: conf.Server.SecureCookie,
HttpOnly: true,
}
logfile := os.Stderr
if conf.Server.HTTPLogFile != "" {
logfile, err = os.OpenFile(conf.Server.HTTPLogFile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0640)
if err != nil {
log.Printf("error opening log: %v. logging to stdout", err)
}
}
ctx.routes()
ctx.router.Use(mwVersion)
ctx.router.Use(handlers.CompressHandler)
ctx.router.Use(handlers.RecoveryHandler())
r := handlers.LoggingHandler(logfile, ctx.router)
s := &http.Server{
Handler: r,
ReadTimeout: 20 * time.Second,
WriteTimeout: 20 * time.Second,
IdleTimeout: 120 * time.Second,
}
log.Printf("Starting server on %s", laddr)
s.Serve(l)
}
// mwVersion is middleware to add a X-Cashier-Version header to the response.
func mwVersion(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-Cashier-Version", lib.Version)
next.ServeHTTP(w, r)
})
}
func encodeString(s string) string {
var buffer bytes.Buffer
chunkSize := 70
runes := []rune(base64.StdEncoding.EncodeToString([]byte(s)))
for i := 0; i < len(runes); i += chunkSize {
end := i + chunkSize
if end > len(runes) {
end = len(runes)
}
buffer.WriteString(string(runes[i:end]))
buffer.WriteString("\n")
}
buffer.WriteString(".\n")
return buffer.String()
}
// app contains local context - cookiestore, authsession etc.
type app struct {
cookiestore *sessions.CookieStore
authprovider *github.Config
keysigner *signer.KeySigner
router *mux.Router
config *config.Server
}
func (a *app) routes() {
// login required
a.router.Methods("GET").Path("/").Handler(a.authed(http.HandlerFunc(a.index)))
// no login required
a.router.Methods("GET").Path("/auth/login").HandlerFunc(a.auth)
a.router.Methods("GET").Path("/auth/callback").HandlerFunc(a.auth)
a.router.Methods("POST").Path("/sign").HandlerFunc(a.sign)
a.router.Methods("GET").Path("/health").HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "ok")
})
a.router.Methods("GET").Path("/metrics").Handler(promhttp.Handler())
box := packr.NewBox("static")
a.router.PathPrefix("/static/").Handler(http.StripPrefix("/static", http.FileServer(box)))
}
func (a *app) getAuthToken(r *http.Request) *oauth2.Token {
token := &oauth2.Token{}
marshalled := a.getSessionVariable(r, "token")
json.Unmarshal([]byte(marshalled), token)
return token
}
func (a *app) setAuthToken(w http.ResponseWriter, r *http.Request, token *oauth2.Token) {
v, _ := json.Marshal(token)
a.setSessionVariable(w, r, "token", string(v))
}
func (a *app) getSessionVariable(r *http.Request, key string) string {
session, _ := a.cookiestore.Get(r, "session")
v, ok := session.Values[key].(string)
if !ok {
v = ""
}
return v
}
func (a *app) setSessionVariable(w http.ResponseWriter, r *http.Request, key, value string) {
session, _ := a.cookiestore.Get(r, "session")
session.Values[key] = value
session.Save(r, w)
}
func (a *app) authed(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
t := a.getAuthToken(r)
if !t.Valid() || !a.authprovider.Valid(t) {
a.setSessionVariable(w, r, "origin_url", r.URL.EscapedPath())
http.Redirect(w, r, "/auth/login", http.StatusSeeOther)
return
}
next.ServeHTTP(w, r)
})
}
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