Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2021, 2022 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU General Public License as published by the Free Software
7 : Foundation; either version 3, 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 General Public License for more details.
12 :
13 : You should have received a copy of the GNU General Public License along with
14 : TALER; see the file COPYING. If not, see
15 : <http://www.gnu.org/licenses/>
16 : */
17 : /**
18 : * @file lib/exchange_api_kyc_proof.c
19 : * @brief Implementation of the /kyc-proof request
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <microhttpd.h> /* just for HTTP proof codes */
24 : #include <gnunet/gnunet_util_lib.h>
25 : #include <gnunet/gnunet_curl_lib.h>
26 : #include "taler_exchange_service.h"
27 : #include "taler_json_lib.h"
28 : #include "exchange_api_handle.h"
29 : #include "taler_signatures.h"
30 : #include "exchange_api_curl_defaults.h"
31 :
32 :
33 : /**
34 : * @brief A ``/kyc-proof`` handle
35 : */
36 : struct TALER_EXCHANGE_KycProofHandle
37 : {
38 :
39 : /**
40 : * The url for this request.
41 : */
42 : char *url;
43 :
44 : /**
45 : * Handle to our CURL request.
46 : */
47 : CURL *eh;
48 :
49 : /**
50 : * Handle for the request.
51 : */
52 : struct GNUNET_CURL_Job *job;
53 :
54 : /**
55 : * Function to call with the result.
56 : */
57 : TALER_EXCHANGE_KycProofCallback cb;
58 :
59 : /**
60 : * Closure for @e cb.
61 : */
62 : void *cb_cls;
63 :
64 : };
65 :
66 :
67 : /**
68 : * Function called when we're done processing the
69 : * HTTP /kyc-proof request.
70 : *
71 : * @param cls the `struct TALER_EXCHANGE_KycProofHandle`
72 : * @param response_code HTTP response code, 0 on error
73 : * @param body response body
74 : * @param body_size number of bytes in @a body
75 : */
76 : static void
77 11 : handle_kyc_proof_finished (void *cls,
78 : long response_code,
79 : const void *body,
80 : size_t body_size)
81 : {
82 11 : struct TALER_EXCHANGE_KycProofHandle *kph = cls;
83 11 : struct TALER_EXCHANGE_KycProofResponse kpr = {
84 11 : .hr.http_status = (unsigned int) response_code
85 : };
86 :
87 : (void) body;
88 : (void) body_size;
89 11 : kph->job = NULL;
90 11 : switch (response_code)
91 : {
92 0 : case 0:
93 0 : break;
94 9 : case MHD_HTTP_SEE_OTHER:
95 : {
96 : char *redirect_url;
97 :
98 9 : GNUNET_assert (CURLE_OK ==
99 : curl_easy_getinfo (kph->eh,
100 : CURLINFO_REDIRECT_URL,
101 : &redirect_url));
102 9 : kpr.details.found.redirect_url = redirect_url;
103 9 : break;
104 : }
105 0 : case MHD_HTTP_BAD_REQUEST:
106 : /* This should never happen, either us or the exchange is buggy
107 : (or API version conflict); just pass JSON reply to the application */
108 0 : break;
109 0 : case MHD_HTTP_UNAUTHORIZED:
110 0 : break;
111 1 : case MHD_HTTP_FORBIDDEN:
112 1 : break;
113 0 : case MHD_HTTP_NOT_FOUND:
114 0 : break;
115 1 : case MHD_HTTP_BAD_GATEWAY:
116 : /* Server had an internal issue; we should retry, but this API
117 : leaves this to the application */
118 1 : break;
119 0 : case MHD_HTTP_GATEWAY_TIMEOUT:
120 : /* Server had an internal issue; we should retry, but this API
121 : leaves this to the application */
122 0 : break;
123 0 : default:
124 : /* unexpected response code */
125 0 : GNUNET_break_op (0);
126 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
127 : "Unexpected response code %u for exchange kyc_proof\n",
128 : (unsigned int) response_code);
129 0 : break;
130 : }
131 11 : kph->cb (kph->cb_cls,
132 : &kpr);
133 11 : TALER_EXCHANGE_kyc_proof_cancel (kph);
134 11 : }
135 :
136 :
137 : struct TALER_EXCHANGE_KycProofHandle *
138 11 : TALER_EXCHANGE_kyc_proof (
139 : struct GNUNET_CURL_Context *ctx,
140 : const char *url,
141 : const struct TALER_NormalizedPaytoHashP *h_payto,
142 : const char *logic,
143 : const char *args,
144 : TALER_EXCHANGE_KycProofCallback cb,
145 : void *cb_cls)
146 : {
147 : struct TALER_EXCHANGE_KycProofHandle *kph;
148 : char *arg_str;
149 :
150 11 : if (NULL == args)
151 0 : args = "";
152 : else
153 11 : GNUNET_assert (args[0] == '&');
154 : {
155 : char hstr[sizeof (*h_payto) * 2];
156 : char *end;
157 :
158 11 : end = GNUNET_STRINGS_data_to_string (h_payto,
159 : sizeof (*h_payto),
160 : hstr,
161 : sizeof (hstr));
162 11 : *end = '\0';
163 11 : GNUNET_asprintf (&arg_str,
164 : "kyc-proof/%s?state=%s%s",
165 : logic,
166 : hstr,
167 : args);
168 : }
169 11 : kph = GNUNET_new (struct TALER_EXCHANGE_KycProofHandle);
170 11 : kph->cb = cb;
171 11 : kph->cb_cls = cb_cls;
172 11 : kph->url = TALER_url_join (url,
173 : arg_str,
174 : NULL);
175 11 : GNUNET_free (arg_str);
176 11 : if (NULL == kph->url)
177 : {
178 0 : GNUNET_free (kph);
179 0 : return NULL;
180 : }
181 11 : kph->eh = TALER_EXCHANGE_curl_easy_get_ (kph->url);
182 11 : if (NULL == kph->eh)
183 : {
184 0 : GNUNET_break (0);
185 0 : GNUNET_free (kph->url);
186 0 : GNUNET_free (kph);
187 0 : return NULL;
188 : }
189 : /* disable location following, we want to learn the
190 : result of a 303 redirect! */
191 11 : GNUNET_assert (CURLE_OK ==
192 : curl_easy_setopt (kph->eh,
193 : CURLOPT_FOLLOWLOCATION,
194 : 0L));
195 11 : kph->job = GNUNET_CURL_job_add_raw (ctx,
196 : kph->eh,
197 : NULL,
198 : &handle_kyc_proof_finished,
199 : kph);
200 11 : return kph;
201 : }
202 :
203 :
204 : void
205 11 : TALER_EXCHANGE_kyc_proof_cancel (struct TALER_EXCHANGE_KycProofHandle *kph)
206 : {
207 11 : if (NULL != kph->job)
208 : {
209 0 : GNUNET_CURL_job_cancel (kph->job);
210 0 : kph->job = NULL;
211 : }
212 11 : GNUNET_free (kph->url);
213 11 : GNUNET_free (kph);
214 11 : }
215 :
216 :
217 : /* end of exchange_api_kyc_proof.c */
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