vain/server.go

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package vain
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import (
"encoding/json"
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"fmt"
"net/http"
"net/mail"
"strings"
"time"
"github.com/elazarl/go-bindata-assetfs"
verrors "mcquay.me/vain/errors"
"mcquay.me/vain/static"
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)
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const apiPrefix = "/api/v0/"
const emailSubject = "your api token"
var prefix map[string]string
func init() {
prefix = map[string]string{
"pkgs": apiPrefix + "db/",
"register": apiPrefix + "register/",
"confirm": apiPrefix + "confirm/",
"forgot": apiPrefix + "forgot/",
"static": "/_static/",
}
}
// Server serves up the http.
type Server struct {
db Storer
static string
emailTimeout time.Duration
mail Mailer
insecure bool
}
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// NewServer populates a server, adds the routes, and returns it for use.
func NewServer(sm *http.ServeMux, store Storer, m Mailer, static string, emailTimeout time.Duration, insecure bool) *Server {
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s := &Server{
db: store,
static: static,
emailTimeout: emailTimeout,
mail: m,
insecure: insecure,
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}
addRoutes(sm, s)
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return s
}
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func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method == "GET" {
req.ParseForm()
if _, ok := req.Form["go-get"]; !ok {
http.Redirect(w, req, prefix["static"], http.StatusTemporaryRedirect)
return
}
if req.URL.Path == "/" {
fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n")
for _, p := range s.db.Pkgs() {
fmt.Fprintf(w, "%s\n", p)
}
fmt.Fprintf(w, "</head>\n<body><p>go tool metadata in head</p></body>\n</html>\n")
} else {
p, err := s.db.Package(req.Host + req.URL.Path)
if err := verrors.ToHTTP(err); err != nil {
http.Error(w, err.Message, err.Code)
return
}
fmt.Fprintf(w, "<!DOCTYPE html>\n<html><head>\n%s\n</head>\n<body><p>go tool metadata in head</p></body>\n</html>\n", p)
}
return
}
const prefix = "Bearer "
var tok string
auth := req.Header.Get("Authorization")
if strings.HasPrefix(auth, prefix) {
tok = strings.TrimPrefix(auth, prefix)
}
if tok == "" {
http.Error(w, "missing token", http.StatusUnauthorized)
return
}
ns, err := parseNamespace(req.URL.Path)
if err != nil {
http.Error(w, fmt.Sprintf("could not parse namespace:%v", err), http.StatusBadRequest)
return
}
if err := verrors.ToHTTP(s.db.NSForToken(ns, tok)); err != nil {
http.Error(w, err.Message, err.Code)
return
}
switch req.Method {
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case "POST":
if req.URL.Path == "/" {
http.Error(w, fmt.Sprintf("invalid path %q", req.URL.Path), http.StatusBadRequest)
return
}
p := Package{}
if err := json.NewDecoder(req.Body).Decode(&p); err != nil {
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http.Error(w, fmt.Sprintf("unable to parse json from body: %v", err), http.StatusBadRequest)
return
}
if p.Repo == "" {
http.Error(w, fmt.Sprintf("invalid repository %q", p.Repo), http.StatusBadRequest)
return
}
if p.Vcs == "" {
p.Vcs = "git"
}
if !valid(p.Vcs) {
http.Error(w, fmt.Sprintf("invalid vcs %q", p.Vcs), http.StatusBadRequest)
return
}
p.Path = fmt.Sprintf("%s/%s", req.Host, strings.Trim(req.URL.Path, "/"))
p.Ns = ns
if !Valid(p.Path, s.db.Pkgs()) {
http.Error(w, fmt.Sprintf("invalid path; prefix already taken %q", req.URL.Path), http.StatusConflict)
return
}
if err := s.db.AddPackage(p); err != nil {
http.Error(w, fmt.Sprintf("unable to add package: %v", err), http.StatusInternalServerError)
return
}
case "DELETE":
p := fmt.Sprintf("%s/%s", req.Host, strings.Trim(req.URL.Path, "/"))
if !s.db.PackageExists(p) {
http.Error(w, fmt.Sprintf("package %q not found", p), http.StatusNotFound)
return
}
if err := s.db.RemovePackage(p); err != nil {
http.Error(w, fmt.Sprintf("unable to delete package: %v", err), http.StatusInternalServerError)
return
}
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default:
http.Error(w, fmt.Sprintf("unsupported method %q; accepted: POST, GET, DELETE", req.Method), http.StatusMethodNotAllowed)
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}
}
func (s *Server) register(w http.ResponseWriter, req *http.Request) {
req.ParseForm()
email, ok := req.Form["email"]
if !ok || len(email) != 1 {
http.Error(w, "must provide one email parameter", http.StatusBadRequest)
return
}
addr, err := mail.ParseAddress(email[0])
if err != nil {
http.Error(w, fmt.Sprintf("invalid email detected: %v", err), http.StatusBadRequest)
return
}
tok, err := s.db.Register(addr.Address)
if err := verrors.ToHTTP(err); err != nil {
http.Error(w, err.Message, err.Code)
return
}
proto := "https"
if s.insecure {
proto = "http"
}
resp := struct {
Msg string `json:"msg"`
}{
Msg: "please check your email\n",
}
err = s.mail.Send(
*addr,
"your api string",
fmt.Sprintf("%s://%s/api/v0/confirm/%+v", proto, req.Host, tok),
)
if err != nil {
resp.Msg = fmt.Sprintf("problem sending email: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
w.Header().Set("Content-type", "application/json")
json.NewEncoder(w).Encode(resp)
}
func (s *Server) confirm(w http.ResponseWriter, req *http.Request) {
tok := req.URL.Path[len(prefix["confirm"]):]
tok = strings.TrimRight(tok, "/")
if tok == "" {
http.Error(w, "must provide one email parameter", http.StatusBadRequest)
return
}
tok, err := s.db.Confirm(tok)
if err := verrors.ToHTTP(err); err != nil {
http.Error(w, err.Message, err.Code)
return
}
fmt.Fprintf(w, "new token: %s\n", tok)
}
func (s *Server) forgot(w http.ResponseWriter, req *http.Request) {
req.ParseForm()
email, ok := req.Form["email"]
if !ok || len(email) != 1 {
http.Error(w, "must provide one email parameter", http.StatusBadRequest)
return
}
addr, err := mail.ParseAddress(email[0])
if err != nil {
http.Error(w, fmt.Sprintf("invalid email detected: %v", err), http.StatusBadRequest)
return
}
tok, err := s.db.forgot(addr.Address, s.emailTimeout)
if err := verrors.ToHTTP(err); err != nil {
http.Error(w, err.Message, err.Code)
return
}
proto := "https"
if s.insecure {
proto = "http"
}
resp := struct {
Msg string `json:"msg"`
}{
Msg: "please check your email\n",
}
err = s.mail.Send(
*addr,
emailSubject,
fmt.Sprintf("%s://%s/api/v0/confirm/%+v", proto, req.Host, tok),
)
if err != nil {
resp.Msg = fmt.Sprintf("problem sending email: %v", err)
w.WriteHeader(http.StatusInternalServerError)
}
w.Header().Set("Content-type", "application/json")
json.NewEncoder(w).Encode(resp)
}
func (s *Server) pkgs(w http.ResponseWriter, req *http.Request) {
w.Header().Set("Content-type", "application/json")
json.NewEncoder(w).Encode(s.db.Pkgs())
}
func addRoutes(sm *http.ServeMux, s *Server) {
sm.Handle("/", s)
if s.static == "" {
sm.Handle(
prefix["static"],
http.FileServer(
&assetfs.AssetFS{
Asset: static.Asset,
AssetDir: static.AssetDir,
AssetInfo: static.AssetInfo,
},
),
)
} else {
sm.Handle(
prefix["static"],
http.StripPrefix(
prefix["static"],
http.FileServer(http.Dir(s.static)),
),
)
}
sm.HandleFunc(prefix["pkgs"], s.pkgs)
sm.HandleFunc(prefix["register"], s.register)
sm.HandleFunc(prefix["confirm"], s.confirm)
sm.HandleFunc(prefix["forgot"], s.forgot)
}