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/$ID/lock request
22 : * of the merchant's HTTP API
23 : * @author Christian Grothoff
24 : */
25 : #include "platform.h"
26 : #include <curl/curl.h>
27 : #include <jansson.h>
28 : #include <microhttpd.h> /* just for HTTP status codes */
29 : #include <gnunet/gnunet_util_lib.h>
30 : #include "taler_merchant_service.h"
31 : #include "merchant_api_curl_defaults.h"
32 : #include <taler/taler_json_lib.h>
33 : #include <taler/taler_curl_lib.h>
34 :
35 :
36 : /**
37 : * Handle for a POST /products/$ID/lock operation.
38 : */
39 : struct TALER_MERCHANT_ProductLockHandle
40 : {
41 :
42 : /**
43 : * The url for this request.
44 : */
45 : char *url;
46 :
47 : /**
48 : * Handle for the request.
49 : */
50 : struct GNUNET_CURL_Job *job;
51 :
52 : /**
53 : * Function to call with the result.
54 : */
55 : TALER_MERCHANT_ProductLockCallback cb;
56 :
57 : /**
58 : * Closure for @a cb.
59 : */
60 : void *cb_cls;
61 :
62 : /**
63 : * Reference to the execution context.
64 : */
65 : struct GNUNET_CURL_Context *ctx;
66 :
67 : /**
68 : * Minor context that holds body and headers.
69 : */
70 : struct TALER_CURL_PostContext post_ctx;
71 :
72 : };
73 :
74 :
75 : /**
76 : * Function called when we're done processing the
77 : * HTTP POST /products/$ID/lock request.
78 : *
79 : * @param cls the `struct TALER_MERCHANT_ProductLockHandle`
80 : * @param response_code HTTP response code, 0 on error
81 : * @param response response body, NULL if not in JSON
82 : */
83 : static void
84 0 : handle_lock_product_finished (void *cls,
85 : long response_code,
86 : const void *response)
87 : {
88 0 : struct TALER_MERCHANT_ProductLockHandle *plh = cls;
89 0 : const json_t *json = response;
90 0 : struct TALER_MERCHANT_HttpResponse hr = {
91 0 : .http_status = (unsigned int) response_code,
92 : .reply = json
93 : };
94 :
95 0 : plh->job = NULL;
96 0 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
97 : "LOCK /products/$ID completed with response code %u\n",
98 : (unsigned int) response_code);
99 0 : switch (response_code)
100 : {
101 0 : case 0:
102 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
103 0 : break;
104 0 : case MHD_HTTP_NO_CONTENT:
105 0 : break;
106 0 : case MHD_HTTP_UNAUTHORIZED:
107 0 : hr.ec = TALER_JSON_get_error_code (json);
108 0 : hr.hint = TALER_JSON_get_error_hint (json);
109 : /* Nothing really to verify, merchant says we need to authenticate. */
110 0 : break;
111 0 : case MHD_HTTP_BAD_REQUEST:
112 0 : hr.ec = TALER_JSON_get_error_code (json);
113 0 : hr.hint = TALER_JSON_get_error_hint (json);
114 0 : GNUNET_break_op (0);
115 : /* This should never happen, either us
116 : * or the merchant is buggy (or API version conflict);
117 : * just pass JSON reply to the application */
118 0 : break;
119 0 : case MHD_HTTP_FORBIDDEN:
120 0 : hr.ec = TALER_JSON_get_error_code (json);
121 0 : hr.hint = TALER_JSON_get_error_hint (json);
122 : /* Nothing really to verify, merchant says we tried to abort the payment
123 : * after it was successful. We should pass the JSON reply to the
124 : * application */
125 0 : break;
126 0 : case MHD_HTTP_NOT_FOUND:
127 0 : hr.ec = TALER_JSON_get_error_code (json);
128 0 : hr.hint = TALER_JSON_get_error_hint (json);
129 0 : break;
130 0 : case MHD_HTTP_GONE:
131 0 : hr.ec = TALER_JSON_get_error_code (json);
132 0 : hr.hint = TALER_JSON_get_error_hint (json);
133 0 : break;
134 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
135 0 : hr.ec = TALER_JSON_get_error_code (json);
136 0 : hr.hint = TALER_JSON_get_error_hint (json);
137 : /* Server had an internal issue; we should retry,
138 : but this API leaves this to the application */
139 0 : break;
140 0 : default:
141 0 : TALER_MERCHANT_parse_error_details_ (json,
142 : response_code,
143 : &hr);
144 : /* unexpected response code */
145 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
146 : "Unexpected response code %u/%d\n",
147 : (unsigned int) response_code,
148 : (int) hr.ec);
149 0 : GNUNET_break_op (0);
150 0 : break;
151 : }
152 0 : plh->cb (plh->cb_cls,
153 : &hr);
154 0 : TALER_MERCHANT_product_lock_cancel (plh);
155 0 : }
156 :
157 :
158 : struct TALER_MERCHANT_ProductLockHandle *
159 0 : TALER_MERCHANT_product_lock (
160 : struct GNUNET_CURL_Context *ctx,
161 : const char *backend_url,
162 : const char *product_id,
163 : const char *uuid,
164 : struct GNUNET_TIME_Relative duration,
165 : uint32_t quantity,
166 : TALER_MERCHANT_ProductLockCallback cb,
167 : void *cb_cls)
168 : {
169 : struct TALER_MERCHANT_ProductLockHandle *plh;
170 : json_t *req_obj;
171 :
172 0 : req_obj = GNUNET_JSON_PACK (
173 : GNUNET_JSON_pack_string ("lock_uuid",
174 : uuid),
175 : GNUNET_JSON_pack_time_rel ("duration",
176 : duration),
177 : GNUNET_JSON_pack_uint64 ("quantity",
178 : quantity));
179 0 : plh = GNUNET_new (struct TALER_MERCHANT_ProductLockHandle);
180 0 : plh->ctx = ctx;
181 0 : plh->cb = cb;
182 0 : plh->cb_cls = cb_cls;
183 : {
184 : char *path;
185 :
186 0 : GNUNET_asprintf (&path,
187 : "private/products/%s/lock",
188 : product_id);
189 0 : plh->url = TALER_url_join (backend_url,
190 : path,
191 : NULL);
192 0 : GNUNET_free (path);
193 : }
194 0 : if (NULL == plh->url)
195 : {
196 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
197 : "Could not construct request URL.\n");
198 0 : json_decref (req_obj);
199 0 : GNUNET_free (plh);
200 0 : return NULL;
201 : }
202 : {
203 : CURL *eh;
204 :
205 0 : eh = TALER_MERCHANT_curl_easy_get_ (plh->url);
206 0 : if (GNUNET_OK !=
207 0 : TALER_curl_easy_post (&plh->post_ctx,
208 : eh,
209 : req_obj))
210 : {
211 0 : GNUNET_break (0);
212 0 : curl_easy_cleanup (eh);
213 0 : json_decref (req_obj);
214 0 : GNUNET_free (plh->url);
215 0 : GNUNET_free (plh);
216 0 : return NULL;
217 : }
218 0 : json_decref (req_obj);
219 0 : plh->job = GNUNET_CURL_job_add2 (ctx,
220 : eh,
221 0 : plh->post_ctx.headers,
222 : &handle_lock_product_finished,
223 : plh);
224 : }
225 0 : return plh;
226 : }
227 :
228 :
229 : void
230 0 : TALER_MERCHANT_product_lock_cancel (
231 : struct TALER_MERCHANT_ProductLockHandle *plh)
232 : {
233 0 : if (NULL != plh->job)
234 : {
235 0 : GNUNET_CURL_job_cancel (plh->job);
236 0 : plh->job = NULL;
237 : }
238 0 : TALER_curl_easy_post_finished (&plh->post_ctx);
239 0 : GNUNET_free (plh->url);
240 0 : GNUNET_free (plh);
241 0 : }
242 :
243 :
244 : /* end of merchant_api_lock_product.c */
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