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authorize.go
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/
authorize.go
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package service
import (
"crypto/rand"
"encoding/hex"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/plgd-dev/go-coap/v2/pkg/cache"
"github.com/plgd-dev/hub/v2/pkg/log"
pkgStrings "github.com/plgd-dev/hub/v2/pkg/strings"
"github.com/plgd-dev/hub/v2/test/oauth-server/uri"
"github.com/plgd-dev/kit/v2/codec/json"
)
type authorizedSession struct {
nonce string
audience string
deviceID string
scope string
}
func (requestHandler *RequestHandler) authorize(w http.ResponseWriter, r *http.Request) {
clientID := r.URL.Query().Get(uri.ClientIDKey)
clientCfg := requestHandler.config.OAuthSigner.Clients.Find(clientID)
if clientCfg == nil {
writeError(w, fmt.Errorf("unknown client_id(%v)", clientID), http.StatusBadRequest)
return
}
b := make([]byte, 16)
_, err := rand.Read(b)
if err != nil {
writeError(w, err, http.StatusInternalServerError)
return
}
responseType := r.URL.Query().Get(uri.ResponseType)
responseMode := r.URL.Query().Get(uri.ResponseMode)
state := r.URL.Query().Get(uri.StateKey)
nonce := r.URL.Query().Get(uri.NonceKey)
audience := r.URL.Query().Get(uri.AudienceKey)
deviceId := r.URL.Query().Get(uri.DeviceId)
code := hex.EncodeToString(b)
scope := DefaultScope
redirectURI := r.URL.Query().Get(uri.RedirectURIKey)
if r.URL.Query().Get(uri.ScopeKey) != "" {
scope = strings.Join(r.URL.Query()[uri.ScopeKey], " ")
}
redirectURIwithErr, err := requestHandler.validateAuthorizeRequest(clientCfg, responseType, scope, redirectURI)
if err != nil {
writeError(w, err, http.StatusBadRequest)
return
}
if redirectURIwithErr != "" {
http.Redirect(w, r, redirectURIwithErr, http.StatusFound)
return
}
requestHandler.authSession.LoadOrStore(code, cache.NewElement(authorizedSession{
nonce: nonce,
audience: audience,
deviceID: deviceId,
scope: scope,
}, time.Now().Add(clientCfg.AuthorizationCodeLifetime), nil))
if responseMode == "web_message" {
writeWebMessage(w, code, state, requestHandler.getDomain())
return
}
if redirectURI == "" {
// tests require returned code even with invalid redirect url
resp := map[string]interface{}{
uri.CodeKey: code,
}
if err = jsonResponseWriter(w, resp); err != nil {
log.Errorf("failed to write response: %v", err)
}
return
}
successRedirectURI, err := buildRedirectURI(redirectURI, string(state), code, "")
if err != nil {
writeError(w, err, http.StatusBadRequest)
return
}
if clientCfg.ConsentScreenEnabled {
writeConsentScreen(w, redirectURI, scope, string(state), code)
return
}
http.Redirect(w, r, successRedirectURI, http.StatusFound)
}
func (requestHandler *RequestHandler) validateAuthorizeRequest(clientCfg *Client, responseType, scope, redirectURI string) (newRedirectURI string, err error) {
if clientCfg.RequiredRedirectURI != "" && clientCfg.RequiredRedirectURI != redirectURI {
return "", fmt.Errorf("invalid redirect uri(%v)", redirectURI)
}
if clientCfg.RequiredResponseType != "" && clientCfg.RequiredResponseType != responseType {
redirectURI, err := buildRedirectURI(redirectURI, "", "", "invalid response type")
if err != nil {
return "", err
}
return redirectURI, nil
}
if clientCfg.RequiredScope != nil {
tScope := strings.Split(scope, " ")
refScope := pkgStrings.MakeSortedSlice(clientCfg.RequiredScope)
if !(pkgStrings.MakeSortedSlice(tScope).IsSubslice(refScope)) {
redirectURI, err := buildRedirectURI(redirectURI, "", "", "invalid scope")
if err != nil {
return "", err
}
return redirectURI, nil
}
}
return "", nil
}
func buildRedirectURI(redirectURI, state, code, errMsg string) (string, error) {
u, err := url.Parse(string(redirectURI))
if err != nil {
return "", err
}
q, err := url.ParseQuery(u.RawQuery)
if err != nil {
return "", err
}
if state != "" {
q.Add(uri.StateKey, string(state))
}
if code != "" {
q.Add(uri.CodeKey, code)
}
if errMsg != "" {
q.Add(uri.ErrorMessageKey, errMsg)
}
u.RawQuery = q.Encode()
return u.String(), nil
}
func writeWebMessage(w http.ResponseWriter, code, state, domain string) {
v := map[string]string{
uri.CodeKey: code,
uri.StateKey: state,
}
json, err := json.Encode(v)
if err != nil {
writeError(w, err, http.StatusBadRequest)
return
}
body := `
<!DOCTYPE html>
<html>
<head>
<title>Authorization Response</title>
</head>
<body>
<script type="text/javascript">
(function(window, document) {
var targetOrigin = "` + domain + `";
var authorizationResponse = {type: "authorization_response",response: ` + string(json) + `};
var mainWin = (window.opener) ? window.opener : window.parent;
mainWin.postMessage(authorizationResponse, targetOrigin);
})(this, this.document);
</script>
</body>
</html>`
w.WriteHeader(http.StatusOK)
w.Header().Set(contentTypeHeaderKey, "text/html;charset=UTF-8")
if _, err = w.Write([]byte(body)); err != nil {
log.Errorf("failed to write response body: %v", err)
}
}
func writeConsentScreen(w http.ResponseWriter, redirectURI, scope, state, code string) {
body := `
<!DOCTYPE html>
<html>
<head>
<title>Consent Screen</title>
</head>
<body>
<center>
</br></br></br>
<p>Hello! The OAuth Client is requesting access to scope: <b>'` + scope + `'</b></p>
<form action="` + redirectURI + `">
<input type="hidden" name="state" value="` + string(state) + `" />
<input type="hidden" name="code" value="` + code + `" />
<input style="background-color: lime; font-size: 16px" type="submit" value="ACCEPT" />
</form>
</br>
<form action="` + redirectURI + `">
<input type="hidden" name="state" value="` + string(state) + `" />
<input type="hidden" name="error" value="access_denied" />
<input style="background-color: tomato; font-size: 16px" type="submit" value="DECLINE" />
</form>
</center>
</body>
</html>`
w.WriteHeader(http.StatusOK)
w.Header().Set(contentTypeHeaderKey, "text/html;charset=UTF-8")
if _, err := w.Write([]byte(body)); err != nil {
writeError(w, err, http.StatusBadRequest)
}
}