Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2025 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU Lesser General Public License as published by the Free Software
7 : Foundation; either version 2.1, or (at your option) any later version.
8 :
9 : TALER is distributed in the hope that it will be useful, but WITHOUT ANY
10 : WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11 : A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
12 :
13 : You should have received a copy of the GNU Lesser General Public License along with
14 : TALER; see the file COPYING.LGPL. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file merchant_api_post_instance_token.c
19 : * @brief Implementation of the POST /instance/$ID/private/token request
20 : * @author Martin Schanzenbach
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 : #include <taler/taler_curl_lib.h>
33 :
34 :
35 : /**
36 : * Handle for a POST /instances/$ID/private/token operation.
37 : */
38 : struct TALER_MERCHANT_InstanceTokenPostHandle
39 : {
40 : /**
41 : * The url for this request.
42 : */
43 : char *url;
44 :
45 : /**
46 : * Handle for the request.
47 : */
48 : struct GNUNET_CURL_Job *job;
49 :
50 : /**
51 : * Function to call with the result.
52 : */
53 : TALER_MERCHANT_InstanceTokenPostCallback cb;
54 :
55 : /**
56 : * Closure for @a cb.
57 : */
58 : void *cb_cls;
59 :
60 : /**
61 : * Reference to the execution context.
62 : */
63 : struct GNUNET_CURL_Context *ctx;
64 :
65 : /**
66 : * Minor context that holds body and headers.
67 : */
68 : struct TALER_CURL_PostContext post_ctx;
69 :
70 : };
71 :
72 :
73 : /**
74 : * Function called when we're done processing the
75 : * HTTP GET /instances/$ID/private/token request.
76 : *
77 : * @param cls the `struct TALER_MERCHANT_InstanceTokenPostHandle`
78 : * @param response_code HTTP response code, 0 on error
79 : * @param response response body, NULL if not in JSON
80 : */
81 : static void
82 4 : handle_post_instance_token_finished (void *cls,
83 : long response_code,
84 : const void *response)
85 : {
86 4 : struct TALER_MERCHANT_InstanceTokenPostHandle *itph = cls;
87 4 : const json_t *json = response;
88 4 : struct TALER_MERCHANT_HttpResponse hr = {
89 4 : .http_status = (unsigned int) response_code,
90 : .reply = json
91 : };
92 :
93 4 : itph->job = NULL;
94 4 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
95 : "Got /instances/$ID response with status code %u\n",
96 : (unsigned int) response_code);
97 4 : switch (response_code)
98 : {
99 4 : case MHD_HTTP_OK:
100 4 : break;
101 0 : case MHD_HTTP_BAD_REQUEST:
102 : /* happens if the auth token is malformed */
103 0 : hr.ec = TALER_JSON_get_error_code (json);
104 0 : hr.hint = TALER_JSON_get_error_hint (json);
105 : /* Nothing really to verify, merchant says we need to authenticate. */
106 0 : break;
107 0 : case MHD_HTTP_UNAUTHORIZED:
108 0 : hr.ec = TALER_JSON_get_error_code (json);
109 0 : hr.hint = TALER_JSON_get_error_hint (json);
110 : /* Nothing really to verify, merchant says we need to authenticate. */
111 0 : break;
112 0 : default:
113 : /* unexpected response code */
114 0 : hr.ec = TALER_JSON_get_error_code (json);
115 0 : hr.hint = TALER_JSON_get_error_hint (json);
116 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
117 : "Unexpected response code %u/%d\n",
118 : (unsigned int) response_code,
119 : (int) hr.ec);
120 0 : break;
121 : }
122 4 : itph->cb (itph->cb_cls,
123 : &hr);
124 4 : TALER_MERCHANT_instance_token_post_cancel (itph);
125 4 : }
126 :
127 :
128 : struct TALER_MERCHANT_InstanceTokenPostHandle *
129 4 : TALER_MERCHANT_instance_token_post (
130 : struct GNUNET_CURL_Context *ctx,
131 : const char *backend_url,
132 : const char *instance_id,
133 : const char *scope,
134 : struct GNUNET_TIME_Relative duration,
135 : bool refreshable,
136 : TALER_MERCHANT_InstanceTokenPostCallback cb,
137 : void *cb_cls)
138 : {
139 : struct TALER_MERCHANT_InstanceTokenPostHandle *itph;
140 : json_t *req_obj;
141 :
142 4 : itph = GNUNET_new (struct TALER_MERCHANT_InstanceTokenPostHandle);
143 4 : itph->ctx = ctx;
144 4 : itph->cb = cb;
145 4 : itph->cb_cls = cb_cls;
146 4 : if (NULL != instance_id)
147 : {
148 : char *path;
149 :
150 4 : GNUNET_asprintf (&path,
151 : "instances/%s/private/token",
152 : instance_id);
153 4 : itph->url = TALER_url_join (backend_url,
154 : path,
155 : NULL);
156 4 : GNUNET_free (path);
157 : }
158 : else
159 : {
160 : /* backend_url is already identifying the instance */
161 0 : itph->url = TALER_url_join (backend_url,
162 : "private/token",
163 : NULL);
164 : }
165 4 : if (NULL == itph->url)
166 : {
167 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
168 : "Could not construct request URL.\n");
169 0 : GNUNET_free (itph);
170 0 : return NULL;
171 : }
172 4 : if (NULL == scope)
173 : {
174 0 : req_obj = GNUNET_JSON_PACK (
175 : GNUNET_JSON_pack_time_rel ("duration",
176 : duration),
177 : GNUNET_JSON_pack_bool ("refreshable",
178 : refreshable),
179 : GNUNET_JSON_pack_string ("scope",
180 : "readonly"));
181 : }
182 : else
183 : {
184 4 : req_obj = GNUNET_JSON_PACK (
185 : GNUNET_JSON_pack_time_rel ("duration",
186 : duration),
187 : GNUNET_JSON_pack_bool ("refreshable",
188 : refreshable),
189 : GNUNET_JSON_pack_string ("scope",
190 : scope));
191 : }
192 4 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
193 : "Requesting URL '%s'\n",
194 : itph->url);
195 : {
196 : CURL *eh;
197 :
198 4 : eh = TALER_MERCHANT_curl_easy_get_ (itph->url);
199 4 : if (GNUNET_OK !=
200 4 : TALER_curl_easy_post (&itph->post_ctx,
201 : eh,
202 : req_obj))
203 : {
204 0 : GNUNET_break (0);
205 0 : curl_easy_cleanup (eh);
206 0 : json_decref (req_obj);
207 0 : GNUNET_free (itph->url);
208 0 : GNUNET_free (itph);
209 0 : return NULL;
210 : }
211 4 : json_decref (req_obj);
212 4 : GNUNET_assert (CURLE_OK ==
213 : curl_easy_setopt (eh,
214 : CURLOPT_CUSTOMREQUEST,
215 : MHD_HTTP_METHOD_POST));
216 8 : itph->job = GNUNET_CURL_job_add2 (ctx,
217 : eh,
218 4 : itph->post_ctx.headers,
219 : &handle_post_instance_token_finished,
220 : itph);
221 : }
222 4 : return itph;
223 : }
224 :
225 :
226 : void
227 4 : TALER_MERCHANT_instance_token_post_cancel (
228 : struct TALER_MERCHANT_InstanceTokenPostHandle *itph)
229 : {
230 4 : if (NULL != itph->job)
231 0 : GNUNET_CURL_job_cancel (itph->job);
232 4 : TALER_curl_easy_post_finished (&itph->post_ctx);
233 4 : GNUNET_free (itph->url);
234 4 : GNUNET_free (itph);
235 4 : }
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