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package main
import (
"fmt"
"log"
"net/http"
"net/url"
"os"
"p83.nl/go/indieauth"
)
const ClientID = "https://p83.nl/track-me"
type IndieAuthHandler struct {
}
func performIndieauthCallback(state, code string, sess *Session) (bool, *indieauth.AuthResponse, error) {
if state != sess.State {
return false, &indieauth.AuthResponse{}, fmt.Errorf("mismatched state %q != %q", state, sess.State)
}
return indieauth.VerifyAuthCode(ClientID, code, sess.RedirectURI, sess.AuthorizationEndpoint)
}
func (h *IndieAuthHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
sess, err := NewSession(w, r)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
defer sess.Flush()
if sess.LoggedIn {
http.Redirect(w, r, "/", 302)
return
}
if r.Method == http.MethodGet {
if r.URL.Path == "" {
fmt.Fprint(w, `<!doctype html>
<html>
<head>
<title>Login - Track Me</title>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.7.1/css/bulma.min.css"
integrity="sha256-zIG416V1ynj3Wgju/scU80KAEWOsO5rRLfVyRDuOv7Q=" crossorigin="anonymous"/>
</head>
<body>
<div class="section">
<div class="container">
<form action="/auth/login" method="post">
<h1 class="title">Login in with your own website</h1>
<div class="field">
<label class="label">Web Sign In:</label>
<div class="control">
<input type="url" name="url" class="input" placeholder="url" />
</div>
</div>
<div class="field">
<div class="control">
<button class="button is-primary" type="submit">Sign in</button>
</div>
</div>
</form>
</div>
</div>
</body>
</html>
`)
return
} else if r.URL.Path == "callback" {
state := r.URL.Query().Get("state")
code := r.URL.Query().Get("code")
verified, authResponse, err := performIndieauthCallback(state, code, sess)
if err != nil {
fmt.Fprintf(w, "ERROR: %q\n", err)
return
}
if verified {
sess.Me = authResponse.Me
sess.LoggedIn = true
nextURI := "/"
if sess.NextURI != "" {
nextURI = sess.NextURI
}
http.Redirect(w, r, nextURI, 302)
return
}
return
} else if r.URL.Path == "logout" {
cleanupSession(sess)
http.Redirect(w, r, "/", 302)
return
}
} else if r.Method == http.MethodPost {
r.ParseForm()
if r.URL.Path == "login" {
// redirect to endpoint
me := r.Form.Get("url")
meURL, err := url.Parse(me)
if err != nil {
http.Error(w, fmt.Sprintf("Bad Request: %s, %s", err.Error(), me), 400)
return
}
endpoints, err := indieauth.GetEndpoints(meURL)
if err != nil {
http.Error(w, fmt.Sprintf("Bad Request: while getting endpoints for %s: %s", me, err.Error()), 400)
return
}
log.Println(endpoints)
authURL, err := url.Parse(endpoints.AuthorizationEndpoint)
if err != nil {
http.Error(w, fmt.Sprintf("Bad Request: %s %s", err.Error(), me), 400)
return
}
log.Println(authURL)
state := RandStringBytes(16)
redirectURI := fmt.Sprintf("%s/auth/callback", os.Getenv("TRACKME_HOST"))
sess.AuthorizationEndpoint = endpoints.AuthorizationEndpoint
sess.Me = meURL.String()
sess.State = state
sess.RedirectURI = redirectURI
sess.LoggedIn = false
authenticationURL := indieauth.CreateAuthenticationURL(*authURL, meURL.String(), ClientID, redirectURI, state)
http.Redirect(w, r, authenticationURL, 302)
return
}
}
}
func cleanupSession(sess *Session) {
sess.LoggedIn = false
sess.State = ""
sess.Me = ""
sess.AuthorizationEndpoint = ""
sess.NextURI = ""
sess.RedirectURI = ""
}