Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2024 Taler Systems SA
4 :
5 : TALER is free software; you can redistribute it and/or modify it under the
6 : terms of the GNU 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_get_products.c
19 : * @brief Implementation of the GET /products 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 "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 :
33 :
34 : /**
35 : * Maximum number of products we return.
36 : */
37 : #define MAX_PRODUCTS 1024
38 :
39 :
40 : /**
41 : * Handle for a GET /products operation.
42 : */
43 : struct TALER_MERCHANT_ProductsGetHandle
44 : {
45 : /**
46 : * The url for this request.
47 : */
48 : char *url;
49 :
50 : /**
51 : * Handle for the request.
52 : */
53 : struct GNUNET_CURL_Job *job;
54 :
55 : /**
56 : * Function to call with the result.
57 : */
58 : TALER_MERCHANT_ProductsGetCallback cb;
59 :
60 : /**
61 : * Closure for @a cb.
62 : */
63 : void *cb_cls;
64 :
65 : /**
66 : * Reference to the execution context.
67 : */
68 : struct GNUNET_CURL_Context *ctx;
69 :
70 : };
71 :
72 :
73 : /**
74 : * Parse product information from @a ia.
75 : *
76 : * @param json overall JSON reply
77 : * @param ia JSON array (or NULL!) with product data
78 : * @param pgh operation handle
79 : * @return #GNUNET_OK on success
80 : */
81 : static enum GNUNET_GenericReturnValue
82 10 : parse_products (const json_t *json,
83 : const json_t *ia,
84 : struct TALER_MERCHANT_ProductsGetHandle *pgh)
85 : {
86 10 : unsigned int ies_len = json_array_size (ia);
87 :
88 10 : if ( (json_array_size (ia) != (size_t) ies_len) ||
89 : (ies_len > MAX_PRODUCTS) )
90 : {
91 0 : GNUNET_break (0);
92 0 : return GNUNET_SYSERR;
93 : }
94 10 : {
95 10 : struct TALER_MERCHANT_InventoryEntry ies[GNUNET_NZL (ies_len)];
96 : size_t index;
97 : json_t *value;
98 : enum GNUNET_GenericReturnValue ret;
99 :
100 10 : ret = GNUNET_OK;
101 12 : json_array_foreach (ia, index, value) {
102 2 : struct TALER_MERCHANT_InventoryEntry *ie = &ies[index];
103 : struct GNUNET_JSON_Specification spec[] = {
104 2 : GNUNET_JSON_spec_string ("product_id",
105 : &ie->product_id),
106 2 : GNUNET_JSON_spec_uint64 ("product_serial",
107 : &ie->product_serial),
108 2 : GNUNET_JSON_spec_end ()
109 : };
110 :
111 2 : if (GNUNET_OK !=
112 2 : GNUNET_JSON_parse (value,
113 : spec,
114 : NULL, NULL))
115 : {
116 0 : GNUNET_break_op (0);
117 0 : ret = GNUNET_SYSERR;
118 0 : continue;
119 : }
120 2 : if (GNUNET_SYSERR == ret)
121 0 : break;
122 : }
123 10 : if (GNUNET_OK == ret)
124 : {
125 10 : struct TALER_MERCHANT_GetProductsResponse gpr = {
126 : .hr.http_status = MHD_HTTP_OK,
127 : .hr.reply = json,
128 : .details.ok.products_length = ies_len,
129 : .details.ok.products = ies
130 : };
131 :
132 10 : pgh->cb (pgh->cb_cls,
133 : &gpr);
134 10 : pgh->cb = NULL; /* just to be sure */
135 : }
136 10 : return ret;
137 : }
138 : }
139 :
140 :
141 : /**
142 : * Function called when we're done processing the
143 : * HTTP /products request.
144 : *
145 : * @param cls the `struct TALER_MERCHANT_ProductsGetHandle`
146 : * @param response_code HTTP response code, 0 on error
147 : * @param response response body, NULL if not in JSON
148 : */
149 : static void
150 14 : handle_get_products_finished (void *cls,
151 : long response_code,
152 : const void *response)
153 : {
154 14 : struct TALER_MERCHANT_ProductsGetHandle *pgh = cls;
155 14 : const json_t *json = response;
156 14 : struct TALER_MERCHANT_GetProductsResponse gpr = {
157 14 : .hr.http_status = (unsigned int) response_code,
158 : .hr.reply = json
159 : };
160 :
161 14 : pgh->job = NULL;
162 14 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
163 : "Got /products response with status code %u\n",
164 : (unsigned int) response_code);
165 14 : switch (response_code)
166 : {
167 10 : case MHD_HTTP_OK:
168 : {
169 : const json_t *products;
170 : struct GNUNET_JSON_Specification spec[] = {
171 10 : GNUNET_JSON_spec_array_const ("products",
172 : &products),
173 10 : GNUNET_JSON_spec_end ()
174 : };
175 :
176 10 : if (GNUNET_OK !=
177 10 : GNUNET_JSON_parse (json,
178 : spec,
179 : NULL, NULL))
180 : {
181 0 : gpr.hr.http_status = 0;
182 0 : gpr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
183 0 : break;
184 : }
185 10 : if (GNUNET_OK ==
186 10 : parse_products (json,
187 : products,
188 : pgh))
189 : {
190 10 : TALER_MERCHANT_products_get_cancel (pgh);
191 10 : return;
192 : }
193 0 : gpr.hr.http_status = 0;
194 0 : gpr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
195 0 : break;
196 : }
197 4 : case MHD_HTTP_UNAUTHORIZED:
198 4 : gpr.hr.ec = TALER_JSON_get_error_code (json);
199 4 : gpr.hr.hint = TALER_JSON_get_error_hint (json);
200 : /* Nothing really to verify, merchant says we need to authenticate. */
201 4 : break;
202 0 : default:
203 : /* unexpected response code */
204 0 : gpr.hr.ec = TALER_JSON_get_error_code (json);
205 0 : gpr.hr.hint = TALER_JSON_get_error_hint (json);
206 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
207 : "Unexpected response code %u/%d\n",
208 : (unsigned int) response_code,
209 : (int) gpr.hr.ec);
210 0 : break;
211 : }
212 4 : pgh->cb (pgh->cb_cls,
213 : &gpr);
214 4 : TALER_MERCHANT_products_get_cancel (pgh);
215 : }
216 :
217 :
218 : struct TALER_MERCHANT_ProductsGetHandle *
219 14 : TALER_MERCHANT_products_get (
220 : struct GNUNET_CURL_Context *ctx,
221 : const char *backend_url,
222 : TALER_MERCHANT_ProductsGetCallback cb,
223 : void *cb_cls)
224 : {
225 : struct TALER_MERCHANT_ProductsGetHandle *pgh;
226 : CURL *eh;
227 :
228 14 : pgh = GNUNET_new (struct TALER_MERCHANT_ProductsGetHandle);
229 14 : pgh->ctx = ctx;
230 14 : pgh->cb = cb;
231 14 : pgh->cb_cls = cb_cls;
232 14 : pgh->url = TALER_url_join (backend_url,
233 : "private/products",
234 : NULL);
235 14 : if (NULL == pgh->url)
236 : {
237 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
238 : "Could not construct request URL.\n");
239 0 : GNUNET_free (pgh);
240 0 : return NULL;
241 : }
242 14 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
243 : "Requesting URL '%s'\n",
244 : pgh->url);
245 14 : eh = TALER_MERCHANT_curl_easy_get_ (pgh->url);
246 14 : pgh->job = GNUNET_CURL_job_add (ctx,
247 : eh,
248 : &handle_get_products_finished,
249 : pgh);
250 14 : return pgh;
251 : }
252 :
253 :
254 : void
255 14 : TALER_MERCHANT_products_get_cancel (
256 : struct TALER_MERCHANT_ProductsGetHandle *pgh)
257 : {
258 14 : if (NULL != pgh->job)
259 0 : GNUNET_CURL_job_cancel (pgh->job);
260 14 : GNUNET_free (pgh->url);
261 14 : GNUNET_free (pgh);
262 14 : }
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