Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2024 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_start.c
19 : * @brief functions to start a KYC process
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include "taler_json_lib.h"
24 : #include <microhttpd.h>
25 : #include <gnunet/gnunet_curl_lib.h>
26 : #include "taler_exchange_service.h"
27 : #include "exchange_api_curl_defaults.h"
28 : #include "taler_signatures.h"
29 : #include "taler_curl_lib.h"
30 : #include "taler_json_lib.h"
31 :
32 :
33 : struct TALER_EXCHANGE_KycStartHandle
34 : {
35 :
36 : /**
37 : * The url for this request.
38 : */
39 : char *url;
40 :
41 : /**
42 : * Minor context that holds body and headers.
43 : */
44 : struct TALER_CURL_PostContext post_ctx;
45 :
46 : /**
47 : * Handle for the request.
48 : */
49 : struct GNUNET_CURL_Job *job;
50 :
51 : /**
52 : * Function to call with the result.
53 : */
54 : TALER_EXCHANGE_KycStartCallback cb;
55 :
56 : /**
57 : * Closure for @a cb.
58 : */
59 : void *cb_cls;
60 :
61 : /**
62 : * Reference to the execution context.
63 : */
64 : struct GNUNET_CURL_Context *ctx;
65 : };
66 :
67 :
68 : /**
69 : * Function called when we're done processing the
70 : * HTTP POST /kyc-start/$ID request.
71 : *
72 : * @param cls the `struct TALER_EXCHANGE_KycStartHandle *`
73 : * @param response_code HTTP response code, 0 on error
74 : * @param response response body, NULL if not in JSON
75 : */
76 : static void
77 10 : handle_kyc_start_finished (void *cls,
78 : long response_code,
79 : const void *response)
80 : {
81 10 : struct TALER_EXCHANGE_KycStartHandle *wh = cls;
82 10 : const json_t *json = response;
83 10 : struct TALER_EXCHANGE_KycStartResponse adr = {
84 10 : .hr.http_status = (unsigned int) response_code,
85 : .hr.reply = json
86 : };
87 :
88 10 : wh->job = NULL;
89 10 : switch (response_code)
90 : {
91 0 : case 0:
92 : /* no reply */
93 0 : adr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
94 0 : adr.hr.hint = "server offline?";
95 0 : break;
96 10 : case MHD_HTTP_OK:
97 : {
98 : struct GNUNET_JSON_Specification spec[] = {
99 10 : GNUNET_JSON_spec_string (
100 : "redirect_url",
101 : &adr.details.ok.redirect_url),
102 10 : GNUNET_JSON_spec_end ()
103 : };
104 :
105 10 : if (GNUNET_OK !=
106 10 : GNUNET_JSON_parse (json,
107 : spec,
108 : NULL, NULL))
109 : {
110 0 : GNUNET_break_op (0);
111 0 : adr.hr.http_status = 0;
112 0 : adr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
113 0 : break;
114 : }
115 : }
116 10 : break;
117 0 : case MHD_HTTP_NOT_FOUND:
118 0 : break;
119 0 : default:
120 : /* unexpected response code */
121 0 : GNUNET_break_op (0);
122 0 : adr.hr.ec = TALER_JSON_get_error_code (json);
123 0 : adr.hr.hint = TALER_JSON_get_error_hint (json);
124 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
125 : "Unexpected response code %u/%d for exchange AML decision\n",
126 : (unsigned int) response_code,
127 : (int) adr.hr.ec);
128 0 : break;
129 : }
130 10 : if (NULL != wh->cb)
131 : {
132 10 : wh->cb (wh->cb_cls,
133 : &adr);
134 10 : wh->cb = NULL;
135 : }
136 10 : TALER_EXCHANGE_kyc_start_cancel (wh);
137 10 : }
138 :
139 :
140 : struct TALER_EXCHANGE_KycStartHandle *
141 10 : TALER_EXCHANGE_kyc_start (
142 : struct GNUNET_CURL_Context *ctx,
143 : const char *url,
144 : const char *id,
145 : TALER_EXCHANGE_KycStartCallback cb,
146 : void *cb_cls)
147 : {
148 : struct TALER_EXCHANGE_KycStartHandle *wh;
149 : CURL *eh;
150 : json_t *body;
151 :
152 10 : wh = GNUNET_new (struct TALER_EXCHANGE_KycStartHandle);
153 10 : wh->cb = cb;
154 10 : wh->cb_cls = cb_cls;
155 10 : wh->ctx = ctx;
156 : {
157 : char *path;
158 :
159 10 : GNUNET_asprintf (&path,
160 : "kyc-start/%s",
161 : id);
162 10 : wh->url = TALER_url_join (url,
163 : path,
164 : NULL);
165 10 : GNUNET_free (path);
166 : }
167 10 : if (NULL == wh->url)
168 : {
169 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
170 : "Could not construct request URL.\n");
171 0 : GNUNET_free (wh);
172 0 : return NULL;
173 : }
174 10 : body = json_object (); /* as per spec: empty! */
175 10 : GNUNET_assert (NULL != body);
176 10 : eh = TALER_EXCHANGE_curl_easy_get_ (wh->url);
177 20 : if ( (NULL == eh) ||
178 : (GNUNET_OK !=
179 10 : TALER_curl_easy_post (&wh->post_ctx,
180 : eh,
181 : body)) )
182 : {
183 0 : GNUNET_break (0);
184 0 : if (NULL != eh)
185 0 : curl_easy_cleanup (eh);
186 0 : json_decref (body);
187 0 : GNUNET_free (wh->url);
188 0 : return NULL;
189 : }
190 10 : json_decref (body);
191 10 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
192 : "Requesting URL '%s'\n",
193 : wh->url);
194 20 : wh->job = GNUNET_CURL_job_add2 (ctx,
195 : eh,
196 10 : wh->post_ctx.headers,
197 : &handle_kyc_start_finished,
198 : wh);
199 10 : if (NULL == wh->job)
200 : {
201 0 : TALER_EXCHANGE_kyc_start_cancel (wh);
202 0 : return NULL;
203 : }
204 10 : return wh;
205 : }
206 :
207 :
208 : void
209 10 : TALER_EXCHANGE_kyc_start_cancel (
210 : struct TALER_EXCHANGE_KycStartHandle *wh)
211 : {
212 10 : if (NULL != wh->job)
213 : {
214 0 : GNUNET_CURL_job_cancel (wh->job);
215 0 : wh->job = NULL;
216 : }
217 10 : TALER_curl_easy_post_finished (&wh->post_ctx);
218 10 : GNUNET_free (wh->url);
219 10 : GNUNET_free (wh);
220 10 : }
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