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 ctx := e.Request().Context()
23
24 var parRequest provider.ParRequest
25 if err := e.Bind(&parRequest); err != nil {
26 s.logger.Error("error binding for par request", "error", err)
27 return helpers.ServerError(e, nil)
28 }
29
30 if err := e.Validate(parRequest); err != nil {
31 s.logger.Error("missing parameters for par request", "error", err)
32 return helpers.InputError(e, nil)
33 }
34
35 // TODO: this seems wrong. should be a way to get the entire request url i believe, but this will work for now
36 dpopProof, err := s.oauthProvider.DpopManager.CheckProof(e.Request().Method, "https://"+s.config.Hostname+e.Request().URL.String(), e.Request().Header, nil)
37 if err != nil {
38 if errors.Is(err, dpop.ErrUseDpopNonce) {
39 nonce := s.oauthProvider.NextNonce()
40 if nonce != "" {
41 e.Response().Header().Set("DPoP-Nonce", nonce)
42 e.Response().Header().Add("access-control-expose-headers", "DPoP-Nonce")
43 }
44 return e.JSON(400, map[string]string{
45 "error": "use_dpop_nonce",
46 })
47 }
48 s.logger.Error("error getting dpop proof", "error", err)
49 return helpers.InputError(e, nil)
50 }
51
52 client, clientAuth, err := s.oauthProvider.AuthenticateClient(e.Request().Context(), parRequest.AuthenticateClientRequestBase, dpopProof, &provider.AuthenticateClientOptions{
53 // rfc9449
54 // https://github.com/bluesky-social/atproto/blob/main/packages/oauth/oauth-provider/src/oauth-provider.ts#L473
55 AllowMissingDpopProof: true,
56 })
57 if err != nil {
58 s.logger.Error("error authenticating client", "client_id", parRequest.ClientID, "error", err)
59 return helpers.InputError(e, to.StringPtr(err.Error()))
60 }
61
62 if parRequest.DpopJkt == nil {
63 if client.Metadata.DpopBoundAccessTokens {
64 parRequest.DpopJkt = to.StringPtr(dpopProof.JKT)
65 }
66 } else {
67 if !client.Metadata.DpopBoundAccessTokens {
68 msg := "dpop bound access tokens are not enabled for this client"
69 s.logger.Error(msg)
70 return helpers.InputError(e, &msg)
71 }
72
73 if dpopProof.JKT != *parRequest.DpopJkt {
74 msg := "supplied dpop jkt does not match header dpop jkt"
75 s.logger.Error(msg)
76 return helpers.InputError(e, &msg)
77 }
78 }
79
80 eat := time.Now().Add(constants.ParExpiresIn)
81 id := oauth.GenerateRequestId()
82
83 authRequest := &provider.OauthAuthorizationRequest{
84 RequestId: id,
85 ClientId: client.Metadata.ClientID,
86 ClientAuth: *clientAuth,
87 Parameters: parRequest,
88 ExpiresAt: eat,
89 }
90
91 if err := s.db.Create(ctx, authRequest, nil).Error; err != nil {
92 s.logger.Error("error creating auth request in db", "error", err)
93 return helpers.ServerError(e, nil)
94 }
95
96 uri := oauth.EncodeRequestUri(id)
97
98 return e.JSON(201, OauthParResponse{
99 ExpiresIn: int64(constants.ParExpiresIn.Seconds()),
100 RequestURI: uri,
101 })
102}