Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2020 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify
6 : it under the terms of the GNU Lesser General Public License as
7 : published by the Free Software Foundation; either version 2.1,
8 : or (at your option) any later version.
9 :
10 : TALER is distributed in the hope that it will be useful,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 : GNU Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General
16 : Public License along with TALER; see the file COPYING.LGPL.
17 : If not, see <http://www.gnu.org/licenses/>
18 : */
19 : /**
20 : * @file merchant_api_lock_product.c
21 : * @brief Implementation of the POST /products/$ID/lock request
22 : * of the merchant's HTTP API
23 : * @author Christian Grothoff
24 : */
25 : #include "platform.h"
26 : #include <curl/curl.h>
27 : #include <jansson.h>
28 : #include <microhttpd.h> /* just for HTTP status codes */
29 : #include <gnunet/gnunet_util_lib.h>
30 : #include "taler_merchant_service.h"
31 : #include "merchant_api_common.h"
32 : #include "merchant_api_curl_defaults.h"
33 : #include <taler/taler_json_lib.h>
34 : #include <taler/taler_curl_lib.h>
35 :
36 :
37 : /**
38 : * Handle for a POST /products/$ID/lock operation.
39 : */
40 : struct TALER_MERCHANT_ProductLockHandle
41 : {
42 :
43 : /**
44 : * The url for this request.
45 : */
46 : char *url;
47 :
48 : /**
49 : * Handle for the request.
50 : */
51 : struct GNUNET_CURL_Job *job;
52 :
53 : /**
54 : * Function to call with the result.
55 : */
56 : TALER_MERCHANT_ProductLockCallback cb;
57 :
58 : /**
59 : * Closure for @a cb.
60 : */
61 : void *cb_cls;
62 :
63 : /**
64 : * Reference to the execution context.
65 : */
66 : struct GNUNET_CURL_Context *ctx;
67 :
68 : /**
69 : * Minor context that holds body and headers.
70 : */
71 : struct TALER_CURL_PostContext post_ctx;
72 :
73 : };
74 :
75 :
76 : /**
77 : * Function called when we're done processing the
78 : * HTTP POST /products/$ID/lock request.
79 : *
80 : * @param cls the `struct TALER_MERCHANT_ProductLockHandle`
81 : * @param response_code HTTP response code, 0 on error
82 : * @param response response body, NULL if not in JSON
83 : */
84 : static void
85 12 : handle_lock_product_finished (void *cls,
86 : long response_code,
87 : const void *response)
88 : {
89 12 : struct TALER_MERCHANT_ProductLockHandle *plh = cls;
90 12 : const json_t *json = response;
91 12 : struct TALER_MERCHANT_HttpResponse hr = {
92 12 : .http_status = (unsigned int) response_code,
93 : .reply = json
94 : };
95 :
96 12 : plh->job = NULL;
97 12 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
98 : "LOCK /products/$ID completed with response code %u\n",
99 : (unsigned int) response_code);
100 12 : switch (response_code)
101 : {
102 0 : case 0:
103 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
104 0 : break;
105 6 : case MHD_HTTP_NO_CONTENT:
106 6 : 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 2 : case MHD_HTTP_BAD_REQUEST:
113 2 : hr.ec = TALER_JSON_get_error_code (json);
114 2 : hr.hint = TALER_JSON_get_error_hint (json);
115 2 : GNUNET_break_op (0);
116 : /* This should never happen, either us
117 : * or the merchant is buggy (or API version conflict);
118 : * just pass JSON reply to the application */
119 2 : break;
120 0 : case MHD_HTTP_FORBIDDEN:
121 0 : hr.ec = TALER_JSON_get_error_code (json);
122 0 : hr.hint = TALER_JSON_get_error_hint (json);
123 : /* Nothing really to verify, merchant says we tried to abort the payment
124 : * after it was successful. We should pass the JSON reply to the
125 : * application */
126 0 : break;
127 2 : case MHD_HTTP_NOT_FOUND:
128 2 : hr.ec = TALER_JSON_get_error_code (json);
129 2 : hr.hint = TALER_JSON_get_error_hint (json);
130 2 : break;
131 2 : case MHD_HTTP_GONE:
132 2 : hr.ec = TALER_JSON_get_error_code (json);
133 2 : hr.hint = TALER_JSON_get_error_hint (json);
134 2 : break;
135 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
136 0 : hr.ec = TALER_JSON_get_error_code (json);
137 0 : hr.hint = TALER_JSON_get_error_hint (json);
138 : /* Server had an internal issue; we should retry,
139 : but this API leaves this to the application */
140 0 : break;
141 0 : default:
142 0 : TALER_MERCHANT_parse_error_details_ (json,
143 : response_code,
144 : &hr);
145 : /* unexpected response code */
146 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
147 : "Unexpected response code %u/%d\n",
148 : (unsigned int) response_code,
149 : (int) hr.ec);
150 0 : GNUNET_break_op (0);
151 0 : break;
152 : }
153 12 : plh->cb (plh->cb_cls,
154 : &hr);
155 12 : TALER_MERCHANT_product_lock_cancel (plh);
156 12 : }
157 :
158 :
159 : struct TALER_MERCHANT_ProductLockHandle *
160 12 : TALER_MERCHANT_product_lock2 (
161 : struct GNUNET_CURL_Context *ctx,
162 : const char *backend_url,
163 : const char *product_id,
164 : const char *uuid,
165 : struct GNUNET_TIME_Relative duration,
166 : uint64_t quantity,
167 : uint32_t quantity_frac,
168 : bool use_fractional_quantity,
169 : TALER_MERCHANT_ProductLockCallback cb,
170 : void *cb_cls)
171 : {
172 : struct TALER_MERCHANT_ProductLockHandle *plh;
173 : json_t *req_obj;
174 : char unit_quantity_buf[64];
175 :
176 12 : TALER_MERCHANT_format_quantity_string (quantity,
177 : quantity_frac,
178 : unit_quantity_buf,
179 : sizeof (unit_quantity_buf));
180 :
181 12 : req_obj = GNUNET_JSON_PACK (
182 : GNUNET_JSON_pack_string ("lock_uuid",
183 : uuid),
184 : GNUNET_JSON_pack_time_rel ("duration",
185 : duration),
186 : GNUNET_JSON_pack_string ("unit_quantity",
187 : unit_quantity_buf));
188 : (void) use_fractional_quantity;
189 12 : GNUNET_assert ( (0 == quantity_frac) || use_fractional_quantity);
190 12 : plh = GNUNET_new (struct TALER_MERCHANT_ProductLockHandle);
191 12 : plh->ctx = ctx;
192 12 : plh->cb = cb;
193 12 : plh->cb_cls = cb_cls;
194 : {
195 : char *path;
196 :
197 12 : GNUNET_asprintf (&path,
198 : "private/products/%s/lock",
199 : product_id);
200 12 : plh->url = TALER_url_join (backend_url,
201 : path,
202 : NULL);
203 12 : GNUNET_free (path);
204 : }
205 12 : if (NULL == plh->url)
206 : {
207 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
208 : "Could not construct request URL.\n");
209 0 : json_decref (req_obj);
210 0 : GNUNET_free (plh);
211 0 : return NULL;
212 : }
213 : {
214 : CURL *eh;
215 :
216 12 : eh = TALER_MERCHANT_curl_easy_get_ (plh->url);
217 12 : if (GNUNET_OK !=
218 12 : TALER_curl_easy_post (&plh->post_ctx,
219 : eh,
220 : req_obj))
221 : {
222 0 : GNUNET_break (0);
223 0 : curl_easy_cleanup (eh);
224 0 : json_decref (req_obj);
225 0 : GNUNET_free (plh->url);
226 0 : GNUNET_free (plh);
227 0 : return NULL;
228 : }
229 12 : json_decref (req_obj);
230 24 : plh->job = GNUNET_CURL_job_add2 (ctx,
231 : eh,
232 12 : plh->post_ctx.headers,
233 : &handle_lock_product_finished,
234 : plh);
235 : }
236 12 : return plh;
237 : }
238 :
239 :
240 : void
241 12 : TALER_MERCHANT_product_lock_cancel (
242 : struct TALER_MERCHANT_ProductLockHandle *plh)
243 : {
244 12 : if (NULL != plh->job)
245 : {
246 0 : GNUNET_CURL_job_cancel (plh->job);
247 0 : plh->job = NULL;
248 : }
249 12 : TALER_curl_easy_post_finished (&plh->post_ctx);
250 12 : GNUNET_free (plh->url);
251 12 : GNUNET_free (plh);
252 12 : }
253 :
254 :
255 : struct TALER_MERCHANT_ProductLockHandle *
256 8 : TALER_MERCHANT_product_lock (
257 : struct GNUNET_CURL_Context *ctx,
258 : const char *backend_url,
259 : const char *product_id,
260 : const char *uuid,
261 : struct GNUNET_TIME_Relative duration,
262 : uint32_t quantity,
263 : TALER_MERCHANT_ProductLockCallback cb,
264 : void *cb_cls)
265 : {
266 8 : return TALER_MERCHANT_product_lock2 (ctx,
267 : backend_url,
268 : product_id,
269 : uuid,
270 : duration,
271 : quantity,
272 : 0,
273 : false,
274 : cb,
275 : cb_cls);
276 : }
277 :
278 :
279 : /* end of merchant_api_lock_product.c */
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