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package main
import (
"fmt"
"html/template"
"log"
"net/http"
"github.com/coreos/go-oidc/v3/oidc"
"github.com/gorilla/sessions"
"golang.org/x/oauth2"
)
func indexHandler(w http.ResponseWriter, r *http.Request) {
session, err := globalState.sessions.Get(r, "session")
if err != nil {
log.Println("error getting the session")
}
tpl := indexTplData{
Error: r.FormValue("error"),
}
tpl.Breadcrumbs = []Breadcrumb{
{
Link{"a", "b"},
[]Link{
{"c", "d"},
{"e", "f"},
},
},
{
Link{"g", "h"},
[]Link{
{"i", "j"},
{"k", "l"},
},
},
}
tpl.NextLinks = []Link{
{"Login", "/login"},
}
if logged, ok := session.Values["logged"].(bool); ok && logged {
tpl.LoggedIn = true
tpl.Claims.IDToken = session.Values["id_token"].(Claims)
tpl.Claims.UserInfo = session.Values["userinfo"].(Claims)
if len(options.GroupsFilter) >= 1 {
for _, group := range tpl.Claims.UserInfo.Groups {
if isStringInSlice(group, options.GroupsFilter) {
tpl.Groups = append(tpl.Groups, filterText(group, options.Filters))
}
}
} else {
tpl.Groups = filterSliceOfText(tpl.Claims.UserInfo.Groups, options.Filters)
}
tpl.Claims.IDToken.PreferredUsername = filterText(tpl.Claims.IDToken.PreferredUsername, options.Filters)
tpl.Claims.UserInfo.PreferredUsername = filterText(tpl.Claims.UserInfo.PreferredUsername, options.Filters)
tpl.Claims.IDToken.Audience = filterSliceOfText(tpl.Claims.IDToken.Audience, options.Filters)
tpl.Claims.UserInfo.Audience = filterSliceOfText(tpl.Claims.UserInfo.Audience, options.Filters)
tpl.Claims.IDToken.Issuer = filterText(tpl.Claims.IDToken.Issuer, options.Filters)
tpl.Claims.UserInfo.Issuer = filterText(tpl.Claims.UserInfo.Issuer, options.Filters)
tpl.Claims.IDToken.Email = filterText(tpl.Claims.IDToken.Email, options.Filters)
tpl.Claims.UserInfo.Email = filterText(tpl.Claims.UserInfo.Email, options.Filters)
tpl.Claims.IDToken.Name = filterText(tpl.Claims.IDToken.Name, options.Filters)
tpl.Claims.UserInfo.Name = filterText(tpl.Claims.UserInfo.Name, options.Filters)
tpl.RawToken = rawTokens[tpl.Claims.IDToken.JWTIdentifier]
tpl.AuthorizeCodeURL = acURLs[tpl.Claims.IDToken.JWTIdentifier].String()
}
w.Header().Add("Content-Type", "text/html")
// get the template
t, err := template.New("index").Funcs(templateFuncMap).ParseGlob(fmt.Sprintf("%s/*.html", options.TemplatesPath))
if err != nil {
log.Printf("Error reading the template Path: %s/*.html", options.TemplatesPath)
log.Println(err)
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("500 - Error reading template file"))
return
}
// exec!
err = t.ExecuteTemplate(w, "index", tpl)
if err != nil {
log.Println(err)
}
}
func loginHandler(w http.ResponseWriter, r *http.Request) {
log.Println("[ ] Getting the global session from the session cookie:")
session, err := globalState.sessions.Get(r, options.CookieName)
if err != nil {
log.Println("[ ] Error getting the cookie")
writeErr(w, nil, "error getting cookie", http.StatusInternalServerError)
return
}
log.Println("[ ] Setting the redirect URL")
session.Values["redirect-url"] = "/"
log.Println("[ ] Saving the session")
if err = session.Save(r, w); err != nil {
writeErr(w, err, "error saving session", http.StatusInternalServerError)
return
}
log.Printf("[ ] Redirecting to %s", oauth2Config.AuthCodeURL("random-string"))
http.Redirect(w, r, oauth2Config.AuthCodeURL("random-string-here"), http.StatusFound)
}
func logoutHandler(w http.ResponseWriter, r *http.Request) {
session, err := globalState.sessions.Get(r, options.CookieName)
if err != nil {
writeErr(w, err, "error getting cookie", http.StatusInternalServerError)
return
}
// wet the session
session.Values = make(map[interface{}]interface{})
if err = session.Save(r, w); err != nil {
writeErr(w, err, "error saving session", http.StatusInternalServerError)
return
}
http.Redirect(w, r, "/", http.StatusFound)
}
func oauthCallbackHandler(res http.ResponseWriter, req *http.Request) {
log.Println("hit the oauth callback handler")
if req.FormValue("error") != "" {
log.Printf("got an error from the idp: %s", req.FormValue("error"))
http.Redirect(res, req, fmt.Sprintf("/error?%s", req.Form.Encode()), http.StatusFound)
return
}
var (
token *oauth2.Token
idToken *oidc.IDToken
err error
idTokenRaw string
ok bool
)
// The state should be checked here in production
if token, err = oauth2Config.Exchange(req.Context(), req.URL.Query().Get("code")); err != nil {
log.Println("Unable to exchange authorization code for tokens")
writeErr(res, err, "unable to exchange authorization code for tokens", http.StatusInternalServerError)
return
}
// Extract the ID Token from OAuth2 token.
if idTokenRaw, ok = token.Extra("id_token").(string); !ok {
log.Println("missing id token")
writeErr(res, nil, "missing id token", http.StatusInternalServerError)
return
}
// Parse and verify ID Token payload.
if idToken, err = verifier.Verify(req.Context(), idTokenRaw); err != nil {
log.Printf("unable to verify id token or token is invalid: %+v", idTokenRaw)
writeErr(res, err, "unable to verify id token or token is invalid", http.StatusInternalServerError)
return
}
// Extract custom claims
claimsIDToken := Claims{}
if err = idToken.Claims(&claimsIDToken); err != nil {
log.Printf("unable to decode id token claims: %+v", &claimsIDToken)
writeErr(res, err, "unable to decode id token claims", http.StatusInternalServerError)
return
}
var userinfo *oidc.UserInfo
if userinfo, err = provider.UserInfo(req.Context(), oauth2.StaticTokenSource(token)); err != nil {
log.Printf("unable to retreive userinfo claims")
writeErr(res, err, "unable to retrieve userinfo claims", http.StatusInternalServerError)
return
}
claimsUserInfo := Claims{}
if err = userinfo.Claims(&claimsUserInfo); err != nil {
log.Printf("unable to decode userinfo claims")
writeErr(res, err, "unable to decode userinfo claims", http.StatusInternalServerError)
return
}
var session *sessions.Session
if session, err = globalState.sessions.Get(req, options.CookieName); err != nil {
log.Printf("unable to get session from cookie")
writeErr(res, err, "unable to get session from cookie", http.StatusInternalServerError)
return
}
session.Values["id_token"] = claimsIDToken
session.Values["userinfo"] = claimsUserInfo
session.Values["logged"] = true
rawTokens[claimsIDToken.JWTIdentifier] = idTokenRaw
acURLs[claimsIDToken.JWTIdentifier] = req.URL
if err = session.Save(req, res); err != nil {
log.Printf("unable to save session")
writeErr(res, err, "unable to save session", http.StatusInternalServerError)
return
}
var redirectUrl string
if redirectUrl, ok = session.Values["redirect-url"].(string); ok {
log.Printf("all fine!")
http.Redirect(res, req, redirectUrl, http.StatusFound)
return
}
http.Redirect(res, req, "/", http.StatusFound)
}
func writeErr(w http.ResponseWriter, err error, msg string, statusCode int) {
switch {
case err == nil:
log.Println(msg)
http.Error(w, msg, statusCode)
default:
log.Println(msg)
log.Println(err)
http.Error(w, fmt.Errorf("%s: %w", msg, err).Error(), statusCode)
}
}
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