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 return e.JSON(400, map[string]string{
38 "error": "use_dpop_nonce",
39 })
40 }
41 s.logger.Error("error getting dpop proof", "error", err)
42 return helpers.InputError(e, nil)
43 }
44
45 client, clientAuth, err := s.oauthProvider.AuthenticateClient(e.Request().Context(), parRequest.AuthenticateClientRequestBase, dpopProof, &provider.AuthenticateClientOptions{
46 // rfc9449
47 // https://github.com/bluesky-social/atproto/blob/main/packages/oauth/oauth-provider/src/oauth-provider.ts#L473
48 AllowMissingDpopProof: true,
49 })
50 if err != nil {
51 s.logger.Error("error authenticating client", "client_id", parRequest.ClientID, "error", err)
52 return helpers.InputError(e, to.StringPtr(err.Error()))
53 }
54
55 if parRequest.DpopJkt == nil {
56 if client.Metadata.DpopBoundAccessTokens {
57 parRequest.DpopJkt = to.StringPtr(dpopProof.JKT)
58 }
59 } else {
60 if !client.Metadata.DpopBoundAccessTokens {
61 msg := "dpop bound access tokens are not enabled for this client"
62 s.logger.Error(msg)
63 return helpers.InputError(e, &msg)
64 }
65
66 if dpopProof.JKT != *parRequest.DpopJkt {
67 msg := "supplied dpop jkt does not match header dpop jkt"
68 s.logger.Error(msg)
69 return helpers.InputError(e, &msg)
70 }
71 }
72
73 eat := time.Now().Add(constants.ParExpiresIn)
74 id := oauth.GenerateRequestId()
75
76 authRequest := &provider.OauthAuthorizationRequest{
77 RequestId: id,
78 ClientId: client.Metadata.ClientID,
79 ClientAuth: *clientAuth,
80 Parameters: parRequest,
81 ExpiresAt: eat,
82 }
83
84 if err := s.db.Create(authRequest, nil).Error; err != nil {
85 s.logger.Error("error creating auth request in db", "error", err)
86 return helpers.ServerError(e, nil)
87 }
88
89 uri := oauth.EncodeRequestUri(id)
90
91 return e.JSON(201, OauthParResponse{
92 ExpiresIn: int64(constants.ParExpiresIn.Seconds()),
93 RequestURI: uri,
94 })
95}