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