Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2023 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_transfers.c
19 : * @brief Implementation of the POST /transfers request of the merchant's HTTP API
20 : * @author Marcello Stanisci
21 : * @author Christian Grothoff
22 : */
23 : #include "platform.h"
24 : #include <curl/curl.h>
25 : #include <jansson.h>
26 : #include <microhttpd.h> /* just for HTTP status codes */
27 : #include <gnunet/gnunet_util_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include "merchant_api_common.h"
31 : #include <taler/taler_curl_lib.h>
32 : #include <taler/taler_json_lib.h>
33 :
34 :
35 : /**
36 : * @brief A handle for POSTing transfer data.
37 : */
38 : struct TALER_MERCHANT_PostTransfersHandle
39 : {
40 :
41 : /**
42 : * The url for this request.
43 : */
44 : char *url;
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_MERCHANT_PostTransfersCallback 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 : * Minor context that holds body and headers.
68 : */
69 : struct TALER_CURL_PostContext post_ctx;
70 :
71 : };
72 :
73 :
74 : /**
75 : * Function called when we're done processing the
76 : * HTTP POST /transfers request.
77 : *
78 : * @param cls the `struct TALER_MERCHANT_PostTransfersHandle`
79 : * @param response_code HTTP response code, 0 on error
80 : * @param response response body, NULL if not in JSON
81 : */
82 : static void
83 6 : handle_post_transfers_finished (void *cls,
84 : long response_code,
85 : const void *response)
86 : {
87 6 : struct TALER_MERCHANT_PostTransfersHandle *pth = cls;
88 6 : struct TALER_MERCHANT_PostTransfersResponse ptr = {
89 : .hr.reply = response,
90 6 : .hr.http_status = (unsigned int) response_code
91 : };
92 :
93 6 : pth->job = NULL;
94 6 : switch (response_code)
95 : {
96 0 : case 0:
97 0 : ptr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
98 0 : break;
99 6 : case MHD_HTTP_NO_CONTENT:
100 6 : break;
101 0 : case MHD_HTTP_UNAUTHORIZED:
102 0 : ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
103 0 : ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
104 : /* Nothing really to verify, merchant says we need to authenticate. */
105 0 : break;
106 0 : case MHD_HTTP_NOT_FOUND:
107 : /* Nothing really to verify, this should never
108 : happen, we should pass the JSON reply to the application */
109 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
110 : "Did not find any data\n");
111 0 : ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
112 0 : ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
113 0 : break;
114 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
115 : /* Server had an internal issue; we should retry, but this API
116 : leaves this to the application */
117 0 : ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
118 0 : ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
119 0 : break;
120 0 : case MHD_HTTP_BAD_GATEWAY:
121 : /* Exchange had an issue; we should retry, but this API
122 : leaves this to the application */
123 0 : ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
124 0 : ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
125 : {
126 : uint32_t ehc;
127 : struct GNUNET_JSON_Specification ispec[] = {
128 0 : TALER_JSON_spec_ec ("exchange_code",
129 : &ptr.details.bad_gateway.exchange_ec),
130 0 : GNUNET_JSON_spec_uint32 ("exchange_http_status",
131 : &ehc),
132 0 : GNUNET_JSON_spec_end ()
133 : };
134 :
135 0 : if (GNUNET_OK !=
136 0 : GNUNET_JSON_parse (ptr.hr.reply,
137 : ispec,
138 : NULL, NULL))
139 : {
140 0 : GNUNET_break_op (0);
141 0 : ptr.details.bad_gateway.exchange_http_status = 0;
142 0 : ptr.details.bad_gateway.exchange_ec = TALER_EC_NONE;
143 0 : break;
144 : }
145 : else
146 : {
147 : ptr.details.bad_gateway.exchange_http_status
148 0 : = (unsigned int) ehc;
149 0 : GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
150 : "Exchange returned %u/%u\n",
151 : (unsigned int) ptr.details.bad_gateway.exchange_ec,
152 : (unsigned int) ehc);
153 : }
154 : }
155 0 : break;
156 0 : case MHD_HTTP_GATEWAY_TIMEOUT:
157 : /* Server had an internal issue; we should retry, but this API
158 : leaves this to the application */
159 0 : ptr.hr.ec = TALER_JSON_get_error_code (ptr.hr.reply);
160 0 : ptr.hr.hint = TALER_JSON_get_error_hint (ptr.hr.reply);
161 0 : break;
162 0 : default:
163 : /* unexpected response code */
164 0 : GNUNET_break_op (0);
165 0 : TALER_MERCHANT_parse_error_details_ (ptr.hr.reply,
166 : response_code,
167 : &ptr.hr);
168 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
169 : "Unexpected response code %u/%d\n",
170 : (unsigned int) ptr.hr.http_status,
171 : (int) ptr.hr.ec);
172 0 : break;
173 : }
174 6 : pth->cb (pth->cb_cls,
175 : &ptr);
176 6 : TALER_MERCHANT_transfers_post_cancel (pth);
177 6 : }
178 :
179 :
180 : struct TALER_MERCHANT_PostTransfersHandle *
181 6 : TALER_MERCHANT_transfers_post (
182 : struct GNUNET_CURL_Context *ctx,
183 : const char *backend_url,
184 : const struct TALER_Amount *credit_amount,
185 : const struct TALER_WireTransferIdentifierRawP *wtid,
186 : struct TALER_FullPayto payto_uri,
187 : const char *exchange_url,
188 : TALER_MERCHANT_PostTransfersCallback cb,
189 : void *cb_cls)
190 : {
191 : struct TALER_MERCHANT_PostTransfersHandle *pth;
192 : CURL *eh;
193 : json_t *req;
194 :
195 6 : pth = GNUNET_new (struct TALER_MERCHANT_PostTransfersHandle);
196 6 : pth->ctx = ctx;
197 6 : pth->cb = cb;
198 6 : pth->cb_cls = cb_cls;
199 6 : pth->url = TALER_url_join (backend_url,
200 : "private/transfers",
201 : NULL);
202 6 : if (NULL == pth->url)
203 : {
204 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
205 : "Could not construct request URL.\n");
206 0 : GNUNET_free (pth);
207 0 : return NULL;
208 : }
209 6 : req = GNUNET_JSON_PACK (
210 : TALER_JSON_pack_amount ("credit_amount",
211 : credit_amount),
212 : GNUNET_JSON_pack_data_auto ("wtid",
213 : wtid),
214 : TALER_JSON_pack_full_payto ("payto_uri",
215 : payto_uri),
216 : GNUNET_JSON_pack_string ("exchange_url",
217 : exchange_url));
218 6 : eh = TALER_MERCHANT_curl_easy_get_ (pth->url);
219 6 : if (GNUNET_OK !=
220 6 : TALER_curl_easy_post (&pth->post_ctx,
221 : eh,
222 : req))
223 : {
224 0 : GNUNET_break (0);
225 0 : curl_easy_cleanup (eh);
226 0 : json_decref (req);
227 0 : GNUNET_free (pth->url);
228 0 : GNUNET_free (pth);
229 0 : return NULL;
230 : }
231 6 : json_decref (req);
232 12 : pth->job = GNUNET_CURL_job_add2 (ctx,
233 : eh,
234 6 : pth->post_ctx.headers,
235 : &handle_post_transfers_finished,
236 : pth);
237 6 : return pth;
238 : }
239 :
240 :
241 : void
242 6 : TALER_MERCHANT_transfers_post_cancel (
243 : struct TALER_MERCHANT_PostTransfersHandle *pth)
244 : {
245 6 : if (NULL != pth->job)
246 : {
247 0 : GNUNET_CURL_job_cancel (pth->job);
248 0 : pth->job = NULL;
249 : }
250 6 : GNUNET_free (pth->url);
251 6 : TALER_curl_easy_post_finished (&pth->post_ctx);
252 6 : GNUNET_free (pth);
253 6 : }
254 :
255 :
256 : /* end of merchant_api_post_transfers.c */
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