hailey.at
1package server
2
3import (
4 "errors"
5 "time"
6
7 "github.com/Azure/go-autorest/autorest/to"
8 "github.com/haileyok/cocoon/internal/helpers"
9 "github.com/haileyok/cocoon/oauth"
10 "github.com/haileyok/cocoon/oauth/constants"
11 "github.com/haileyok/cocoon/oauth/dpop"
12 "github.com/haileyok/cocoon/oauth/provider"
13 "github.com/labstack/echo/v4"
14)
15
16type OauthParResponse struct {
17 ExpiresIn int64 `json:"expires_in"`
18 RequestURI string `json:"request_uri"`
19}
20
21func (s *Server) handleOauthPar(e echo.Context) error {
22 var parRequest provider.ParRequest
23 if err := e.Bind(&parRequest); err != nil {
24 s.logger.Error("error binding for par request", "error", err)
25 return helpers.ServerError(e, nil)
26 }
27
28 if err := e.Validate(parRequest); err != nil {
29 s.logger.Error("missing parameters for par request", "error", err)
30 return helpers.InputError(e, nil)
31 }
32
33 // TODO: this seems wrong. should be a way to get the entire request url i believe, but this will work for now
34 dpopProof, err := s.oauthProvider.DpopManager.CheckProof(e.Request().Method, "https://"+s.config.Hostname+e.Request().URL.String(), e.Request().Header, nil)
35 if err != nil {
36 if errors.Is(err, dpop.ErrUseDpopNonce) {
37 nonce := s.oauthProvider.NextNonce()
38 if nonce != "" {
39 e.Response().Header().Set("DPoP-Nonce", nonce)
40 e.Response().Header().Add("access-control-expose-headers", "DPoP-Nonce")
41 }
42 return e.JSON(400, map[string]string{
43 "error": "use_dpop_nonce",
44 })
45 }
46 s.logger.Error("error getting dpop proof", "error", err)
47 return helpers.InputError(e, nil)
48 }
49
50 client, clientAuth, err := s.oauthProvider.AuthenticateClient(e.Request().Context(), parRequest.AuthenticateClientRequestBase, dpopProof, &provider.AuthenticateClientOptions{
51 // rfc9449
52 // https://github.com/bluesky-social/atproto/blob/main/packages/oauth/oauth-provider/src/oauth-provider.ts#L473
53 AllowMissingDpopProof: true,
54 })
55 if err != nil {
56 s.logger.Error("error authenticating client", "client_id", parRequest.ClientID, "error", err)
57 return helpers.InputError(e, to.StringPtr(err.Error()))
58 }
59
60 if parRequest.DpopJkt == nil {
61 if client.Metadata.DpopBoundAccessTokens {
62 parRequest.DpopJkt = to.StringPtr(dpopProof.JKT)
63 }
64 } else {
65 if !client.Metadata.DpopBoundAccessTokens {
66 msg := "dpop bound access tokens are not enabled for this client"
67 s.logger.Error(msg)
68 return helpers.InputError(e, &msg)
69 }
70
71 if dpopProof.JKT != *parRequest.DpopJkt {
72 msg := "supplied dpop jkt does not match header dpop jkt"
73 s.logger.Error(msg)
74 return helpers.InputError(e, &msg)
75 }
76 }
77
78 eat := time.Now().Add(constants.ParExpiresIn)
79 id := oauth.GenerateRequestId()
80
81 authRequest := &provider.OauthAuthorizationRequest{
82 RequestId: id,
83 ClientId: client.Metadata.ClientID,
84 ClientAuth: *clientAuth,
85 Parameters: parRequest,
86 ExpiresAt: eat,
87 }
88
89 if err := s.db.Create(authRequest, nil).Error; err != nil {
90 s.logger.Error("error creating auth request in db", "error", err)
91 return helpers.ServerError(e, nil)
92 }
93
94 uri := oauth.EncodeRequestUri(id)
95
96 return e.JSON(201, OauthParResponse{
97 ExpiresIn: int64(constants.ParExpiresIn.Seconds()),
98 RequestURI: uri,
99 })
100}