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grant.go
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grant.go
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package grant
import (
"html/template"
"net/http"
"net/url"
"strings"
"github.com/golang/glog"
authapi "github.com/openshift/origin/pkg/auth/api"
"github.com/openshift/origin/pkg/auth/authenticator"
"github.com/openshift/origin/pkg/auth/server/csrf"
oapi "github.com/openshift/origin/pkg/oauth/api"
clientregistry "github.com/openshift/origin/pkg/oauth/registry/client"
"github.com/openshift/origin/pkg/oauth/registry/clientauthorization"
"github.com/openshift/origin/pkg/oauth/scope"
)
const (
thenParam = "then"
csrfParam = "csrf"
clientIDParam = "client_id"
userNameParam = "user_name"
scopesParam = "scopes"
redirectURIParam = "redirect_uri"
)
// FormRenderer is responsible for rendering a Form to prompt the user
// to approve or reject a requested OAuth scope grant.
type FormRenderer interface {
Render(form Form, w http.ResponseWriter, req *http.Request)
}
type Form struct {
Action string
Error string
Values FormValues
}
type FormValues struct {
Then string
CSRF string
ClientID string
UserName string
Scopes string
RedirectURI string
}
type Grant struct {
auth authenticator.Request
csrf csrf.CSRF
render FormRenderer
clientregistry clientregistry.Registry
authregistry clientauthorization.Registry
}
func NewGrant(csrf csrf.CSRF, auth authenticator.Request, render FormRenderer, clientregistry clientregistry.Registry, authregistry clientauthorization.Registry) *Grant {
return &Grant{
auth: auth,
csrf: csrf,
render: render,
clientregistry: clientregistry,
authregistry: authregistry,
}
}
// Install registers the grant handler into a mux. It is expected that the
// provided prefix will serve all operations. Path MUST NOT end in a slash.
func (l *Grant) Install(mux Mux, paths ...string) {
for _, path := range paths {
path = strings.TrimRight(path, "/")
mux.HandleFunc(path, l.ServeHTTP)
}
}
func (l *Grant) ServeHTTP(w http.ResponseWriter, req *http.Request) {
user, ok, err := l.auth.AuthenticateRequest(req)
if err != nil || !ok {
l.redirect("You must reauthenticate before continuing", w, req)
return
}
switch req.Method {
case "GET":
l.handleForm(user, w, req)
case "POST":
l.handleGrant(user, w, req)
default:
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
}
}
func (l *Grant) handleForm(user authapi.UserInfo, w http.ResponseWriter, req *http.Request) {
q := req.URL.Query()
then := q.Get("then")
clientID := q.Get("client_id")
scopes := q.Get("scopes")
redirectURI := q.Get("redirect_uri")
client, err := l.clientregistry.GetClient(clientID)
if err != nil || client == nil {
l.failed("Could not find client for client_id", w, req)
return
}
uri, err := getBaseURL(req)
if err != nil {
glog.Errorf("Unable to generate base URL: %v", err)
http.Error(w, "Unable to determine URL", http.StatusInternalServerError)
return
}
csrf, err := l.csrf.Generate(w, req)
if err != nil {
glog.Errorf("Unable to generate CSRF token: %v", err)
l.failed("Could not generate CSRF token", w, req)
return
}
form := Form{
Action: uri.String(),
Values: FormValues{
Then: then,
CSRF: csrf,
ClientID: client.Name,
UserName: user.GetName(),
Scopes: scopes,
RedirectURI: redirectURI,
},
}
l.render.Render(form, w, req)
}
func (l *Grant) handleGrant(user authapi.UserInfo, w http.ResponseWriter, req *http.Request) {
if ok, err := l.csrf.Check(req, req.FormValue("csrf")); !ok || err != nil {
glog.Errorf("Unable to check CSRF token: %v", err)
l.failed("Invalid CSRF token", w, req)
return
}
then := req.FormValue("then")
clientID := req.FormValue("client_id")
scopes := req.FormValue("scopes")
client, err := l.clientregistry.GetClient(clientID)
if err != nil || client == nil {
l.failed("Could not find client for client_id", w, req)
return
}
clientAuthID := l.authregistry.ClientAuthorizationName(user.GetName(), client.Name)
clientAuth, err := l.authregistry.GetClientAuthorization(clientAuthID)
if err == nil && clientAuth != nil {
// Add new scopes and update
clientAuth.Scopes = scope.Add(clientAuth.Scopes, scope.Split(scopes))
if err = l.authregistry.UpdateClientAuthorization(clientAuth); err != nil {
glog.Errorf("Unable to update authorization: %v", err)
l.failed("Could not update client authorization", w, req)
return
}
} else {
// Make sure client name, user name, grant scope, expiration, and redirect uri match
clientAuth = &oapi.OAuthClientAuthorization{
UserName: user.GetName(),
UserUID: user.GetUID(),
ClientName: client.Name,
Scopes: scope.Split(scopes),
}
clientAuth.Name = clientAuthID
if err = l.authregistry.CreateClientAuthorization(clientAuth); err != nil {
glog.Errorf("Unable to create authorization: %v", err)
l.failed("Could not create client authorization", w, req)
return
}
}
if len(then) == 0 {
l.failed("Approval granted, but no redirect URL was specified", w, req)
return
}
http.Redirect(w, req, then, http.StatusFound)
}
func (l *Grant) failed(reason string, w http.ResponseWriter, req *http.Request) {
form := Form{
Error: reason,
}
l.render.Render(form, w, req)
}
func (l *Grant) redirect(reason string, w http.ResponseWriter, req *http.Request) {
then := req.FormValue("then")
// TODO: validate then
if len(then) == 0 {
l.failed(reason, w, req)
return
}
http.Redirect(w, req, then, http.StatusFound)
}
func getBaseURL(req *http.Request) (*url.URL, error) {
uri, err := url.Parse(req.RequestURI)
if err != nil {
return nil, err
}
uri.Scheme, uri.Host, uri.RawQuery, uri.Fragment = req.URL.Scheme, req.URL.Host, "", ""
return uri, nil
}
// DefaultFormRenderer displays a page prompting the user to approve an OAuth grant.
// The requesting client id, requested scopes, and redirect URI are displayed to the user.
var DefaultFormRenderer = grantTemplateRenderer{}
type grantTemplateRenderer struct{}
func (r grantTemplateRenderer) Render(form Form, w http.ResponseWriter, req *http.Request) {
w.Header().Add("Content-Type", "text/html")
w.WriteHeader(http.StatusOK)
if err := grantTemplate.Execute(w, form); err != nil {
glog.Errorf("Unable to render grant template: %v", err)
}
}
var grantTemplate = template.Must(template.New("grantForm").Parse(`
{{ if .Error }}
<div class="message">{{ .Error }}</div>
{{ else }}
<form action="{{ .Action }}" method="POST">
<input type="hidden" name="then" value="{{ .Values.Then }}">
<input type="hidden" name="csrf" value="{{ .Values.CSRF }}">
<input type="hidden" name="client_id" value="{{ .Values.ClientID }}">
<input type="hidden" name="user_name" value="{{ .Values.UserName }}">
<input type="hidden" name="scopes" value="{{ .Values.Scopes }}">
<input type="hidden" name="redirect_uri" value="{{ .Values.RedirectURI }}">
<div>Do you approve this client?</div>
<div>Client: {{ .Values.ClientID }}</div>
<div>Scope: {{ .Values.Scopes }}</div>
<div>URI: {{ .Values.RedirectURI }}</div>
<input type="submit" value="Approve">
</form>
{{ end }}
`))