Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2018, 2020 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 lib/merchant_api_get_product.c
19 : * @brief Implementation of the GET /product/$ID request of the merchant's HTTP API
20 : * @author Christian Grothoff
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include <taler/taler_json_lib.h>
30 : #include <taler/taler_signatures.h>
31 :
32 :
33 : /**
34 : * Handle for a GET /products/$ID operation.
35 : */
36 : struct TALER_MERCHANT_ProductGetHandle
37 : {
38 : /**
39 : * The url for this request.
40 : */
41 : char *url;
42 :
43 : /**
44 : * Handle for the request.
45 : */
46 : struct GNUNET_CURL_Job *job;
47 :
48 : /**
49 : * Function to call with the result.
50 : */
51 : TALER_MERCHANT_ProductGetCallback cb;
52 :
53 : /**
54 : * Closure for @a cb.
55 : */
56 : void *cb_cls;
57 :
58 : /**
59 : * Reference to the execution context.
60 : */
61 : struct GNUNET_CURL_Context *ctx;
62 :
63 : };
64 :
65 :
66 : /**
67 : * Function called when we're done processing the
68 : * HTTP GET /products/$ID request.
69 : *
70 : * @param cls the `struct TALER_MERCHANT_ProductGetHandle`
71 : * @param response_code HTTP response code, 0 on error
72 : * @param json response body, NULL if not in JSON
73 : */
74 : static void
75 0 : handle_get_product_finished (void *cls,
76 : long response_code,
77 : const void *response)
78 : {
79 0 : struct TALER_MERCHANT_ProductGetHandle *pgh = cls;
80 0 : const json_t *json = response;
81 0 : struct TALER_MERCHANT_HttpResponse hr = {
82 0 : .http_status = (unsigned int) response_code,
83 : .reply = json
84 : };
85 :
86 0 : pgh->job = NULL;
87 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
88 : "Got /products/$ID response with status code %u\n",
89 : (unsigned int) response_code);
90 0 : switch (response_code)
91 : {
92 0 : case MHD_HTTP_OK:
93 : {
94 : const char *description;
95 : json_t *description_i18n;
96 : const char *unit;
97 : struct TALER_Amount price;
98 : json_t *image;
99 : json_t *taxes;
100 : int64_t total_stock;
101 : uint64_t total_sold;
102 : uint64_t total_lost;
103 : json_t *address;
104 0 : bool rst_ok = true;
105 0 : struct GNUNET_TIME_Absolute next_restock = {0};
106 : struct GNUNET_JSON_Specification spec[] = {
107 0 : GNUNET_JSON_spec_string ("description",
108 : &description),
109 0 : GNUNET_JSON_spec_json ("description_i18n",
110 : &description_i18n),
111 0 : GNUNET_JSON_spec_string ("unit",
112 : &unit),
113 0 : TALER_JSON_spec_amount ("price",
114 : &price),
115 0 : GNUNET_JSON_spec_json ("image",
116 : &image),
117 0 : GNUNET_JSON_spec_json ("taxes",
118 : &taxes),
119 0 : GNUNET_JSON_spec_int64 ("total_stock",
120 : &total_stock),
121 0 : GNUNET_JSON_spec_uint64 ("total_sold",
122 : &total_sold),
123 0 : GNUNET_JSON_spec_uint64 ("total_lost",
124 : &total_lost),
125 0 : GNUNET_JSON_spec_json ("address",
126 : &address),
127 0 : GNUNET_JSON_spec_end ()
128 : };
129 :
130 0 : if (NULL !=
131 0 : json_object_get (json,
132 : "next_restock"))
133 : {
134 : struct GNUNET_JSON_Specification spect[] = {
135 0 : TALER_JSON_spec_absolute_time ("next_restock",
136 : &next_restock),
137 0 : GNUNET_JSON_spec_end ()
138 : };
139 :
140 0 : if (GNUNET_OK !=
141 0 : GNUNET_JSON_parse (json,
142 : spect,
143 : NULL, NULL))
144 0 : rst_ok = false;
145 : }
146 :
147 :
148 0 : if ( (rst_ok) &&
149 : (GNUNET_OK ==
150 0 : GNUNET_JSON_parse (json,
151 : spec,
152 : NULL, NULL)) )
153 : {
154 0 : pgh->cb (pgh->cb_cls,
155 : &hr,
156 : description,
157 : description_i18n,
158 : unit,
159 : &price,
160 : image,
161 : taxes,
162 : total_stock,
163 : total_sold,
164 : total_lost,
165 : address,
166 : next_restock);
167 0 : GNUNET_JSON_parse_free (spec);
168 0 : TALER_MERCHANT_product_get_cancel (pgh);
169 0 : return;
170 : }
171 0 : hr.http_status = 0;
172 0 : hr.ec = TALER_EC_INVALID_RESPONSE;
173 0 : GNUNET_JSON_parse_free (spec);
174 0 : break;
175 : }
176 0 : default:
177 : /* unexpected response code */
178 0 : hr.ec = TALER_JSON_get_error_code (json);
179 0 : hr.hint = TALER_JSON_get_error_hint (json);
180 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
181 : "Unexpected response code %u/%d\n",
182 : (unsigned int) response_code,
183 : (int) hr.ec);
184 0 : break;
185 : }
186 0 : pgh->cb (pgh->cb_cls,
187 : &hr,
188 : NULL,
189 : NULL,
190 : NULL,
191 : NULL,
192 : NULL,
193 : NULL,
194 : 0,
195 : 0,
196 : 0,
197 : NULL,
198 : GNUNET_TIME_UNIT_FOREVER_ABS);
199 0 : TALER_MERCHANT_product_get_cancel (pgh);
200 : }
201 :
202 :
203 : /**
204 : * Make a GET /product/$ID request to get details about an
205 : * individual product.
206 : *
207 : * @param ctx the context
208 : * @param backend_url HTTP base URL for the backend
209 : * @param product_id identifier of the product to inquire about
210 : * @param cb function to call with the backend's product information
211 : * @param cb_cls closure for @a cb
212 : * @return the request handle; NULL upon error
213 : */
214 : struct TALER_MERCHANT_ProductGetHandle *
215 0 : TALER_MERCHANT_product_get (
216 : struct GNUNET_CURL_Context *ctx,
217 : const char *backend_url,
218 : const char *product_id,
219 : TALER_MERCHANT_ProductGetCallback cb,
220 : void *cb_cls)
221 : {
222 : struct TALER_MERCHANT_ProductGetHandle *pgh;
223 : CURL *eh;
224 :
225 0 : pgh = GNUNET_new (struct TALER_MERCHANT_ProductGetHandle);
226 0 : pgh->ctx = ctx;
227 0 : pgh->cb = cb;
228 0 : pgh->cb_cls = cb_cls;
229 : {
230 : char *path;
231 :
232 0 : GNUNET_asprintf (&path,
233 : "private/products/%s",
234 : product_id);
235 0 : pgh->url = TALER_url_join (backend_url,
236 : path,
237 : NULL);
238 0 : GNUNET_free (path);
239 : }
240 0 : if (NULL == pgh->url)
241 : {
242 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
243 : "Could not construct request URL.\n");
244 0 : GNUNET_free (pgh);
245 0 : return NULL;
246 : }
247 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
248 : "Requesting URL '%s'\n",
249 : pgh->url);
250 0 : eh = curl_easy_init ();
251 0 : GNUNET_assert (CURLE_OK ==
252 : curl_easy_setopt (eh,
253 : CURLOPT_URL,
254 : pgh->url));
255 0 : pgh->job = GNUNET_CURL_job_add (ctx,
256 : eh,
257 : &handle_get_product_finished,
258 : pgh);
259 0 : return pgh;
260 : }
261 :
262 :
263 : /**
264 : * Cancel GET /product/$ID request. Must not be called by clients after
265 : * the callback was invoked.
266 : *
267 : * @param pgh request to cancel.
268 : */
269 : void
270 0 : TALER_MERCHANT_product_get_cancel (
271 : struct TALER_MERCHANT_ProductGetHandle *pgh)
272 : {
273 0 : if (NULL != pgh->job)
274 0 : GNUNET_CURL_job_cancel (pgh->job);
275 0 : GNUNET_free (pgh->url);
276 0 : GNUNET_free (pgh);
277 0 : }
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