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_instances.c
19 : * @brief Implementation of the GET /instances 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 /instances operation.
36 : */
37 : struct TALER_MERCHANT_InstancesGetHandle
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_InstancesGetCallback 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 instance information from @a ia.
69 : *
70 : * @param ia JSON array (or NULL!) with instance data
71 : * @param igh operation handle
72 : * @return #GNUNET_OK on success
73 : */
74 : static int
75 0 : parse_instances (const json_t *ia,
76 : struct TALER_MERCHANT_InstancesGetHandle *igh)
77 0 : {
78 0 : unsigned int iis_len = json_array_size (ia);
79 0 : struct TALER_MERCHANT_InstanceInformation iis[iis_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_InstanceInformation *ii = &iis[index];
87 : struct GNUNET_JSON_Specification spec[] = {
88 0 : GNUNET_JSON_spec_string ("name",
89 : &ii->name),
90 0 : GNUNET_JSON_spec_string ("id",
91 : &ii->id),
92 0 : GNUNET_JSON_spec_fixed_auto ("merchant_pub",
93 : &ii->merchant_pub),
94 0 : GNUNET_JSON_spec_json ("payment_targets",
95 : &ii->payment_targets),
96 0 : GNUNET_JSON_spec_end ()
97 : };
98 :
99 0 : if (GNUNET_OK !=
100 0 : GNUNET_JSON_parse (value,
101 : spec,
102 : NULL, NULL))
103 : {
104 0 : GNUNET_break_op (0);
105 0 : ret = GNUNET_SYSERR;
106 0 : continue;
107 : }
108 0 : if (! json_is_array (ii->payment_targets))
109 : {
110 0 : GNUNET_break_op (0);
111 0 : ret = GNUNET_SYSERR;
112 0 : break;
113 : }
114 0 : for (unsigned int i = 0; i<json_array_size (ii->payment_targets); i++)
115 : {
116 0 : if (! json_is_string (json_array_get (ii->payment_targets,
117 : i)))
118 : {
119 0 : GNUNET_break_op (0);
120 0 : ret = GNUNET_SYSERR;
121 0 : break;
122 : }
123 : }
124 0 : if (GNUNET_SYSERR == ret)
125 0 : break;
126 : }
127 0 : if (GNUNET_OK == ret)
128 : {
129 0 : struct TALER_MERCHANT_HttpResponse hr = {
130 : .http_status = MHD_HTTP_OK
131 : };
132 :
133 0 : igh->cb (igh->cb_cls,
134 : &hr,
135 : iis_len,
136 : iis);
137 0 : igh->cb = NULL; /* just to be sure */
138 : }
139 0 : for (unsigned int i = 0; i<iis_len; i++)
140 0 : if (NULL != iis[i].payment_targets)
141 0 : json_decref (iis[i].payment_targets);
142 0 : return ret;
143 : }
144 :
145 :
146 : /**
147 : * Function called when we're done processing the
148 : * HTTP /instances request.
149 : *
150 : * @param cls the `struct TALER_MERCHANT_InstancesGetHandle`
151 : * @param response_code HTTP response code, 0 on error
152 : * @param response response body, NULL if not in JSON
153 : */
154 : static void
155 0 : handle_instances_finished (void *cls,
156 : long response_code,
157 : const void *response)
158 : {
159 0 : struct TALER_MERCHANT_InstancesGetHandle *igh = cls;
160 0 : const json_t *json = response;
161 0 : struct TALER_MERCHANT_HttpResponse hr = {
162 0 : .http_status = (unsigned int) response_code,
163 : .reply = json
164 : };
165 :
166 0 : igh->job = NULL;
167 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
168 : "Got /instances response with status code %u\n",
169 : (unsigned int) response_code);
170 0 : switch (response_code)
171 : {
172 0 : case MHD_HTTP_OK:
173 : {
174 : json_t *instances;
175 : struct GNUNET_JSON_Specification spec[] = {
176 0 : GNUNET_JSON_spec_json ("instances",
177 : &instances),
178 0 : GNUNET_JSON_spec_end ()
179 : };
180 :
181 0 : if (GNUNET_OK !=
182 0 : GNUNET_JSON_parse (json,
183 : spec,
184 : NULL, NULL))
185 : {
186 0 : hr.http_status = 0;
187 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
188 : }
189 : else
190 : {
191 0 : if ( (! json_is_array (instances)) ||
192 : (GNUNET_OK ==
193 0 : parse_instances (instances,
194 : igh)) )
195 : {
196 0 : GNUNET_JSON_parse_free (spec);
197 0 : TALER_MERCHANT_instances_get_cancel (igh);
198 0 : return;
199 : }
200 : else
201 : {
202 0 : hr.http_status = 0;
203 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
204 : }
205 : }
206 0 : GNUNET_JSON_parse_free (spec);
207 0 : break;
208 : }
209 0 : case MHD_HTTP_UNAUTHORIZED:
210 0 : hr.ec = TALER_JSON_get_error_code (json);
211 0 : hr.hint = TALER_JSON_get_error_hint (json);
212 0 : break;
213 0 : default:
214 : /* unexpected response code */
215 0 : hr.ec = TALER_JSON_get_error_code (json);
216 0 : hr.hint = TALER_JSON_get_error_hint (json);
217 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
218 : "Unexpected response code %u/%d\n",
219 : (unsigned int) response_code,
220 : (int) hr.ec);
221 0 : break;
222 : }
223 0 : igh->cb (igh->cb_cls,
224 : &hr,
225 : 0,
226 : NULL);
227 0 : TALER_MERCHANT_instances_get_cancel (igh);
228 : }
229 :
230 :
231 : struct TALER_MERCHANT_InstancesGetHandle *
232 0 : TALER_MERCHANT_instances_get (struct GNUNET_CURL_Context *ctx,
233 : const char *backend_url,
234 : TALER_MERCHANT_InstancesGetCallback instances_cb,
235 : void *instances_cb_cls)
236 : {
237 : struct TALER_MERCHANT_InstancesGetHandle *igh;
238 : CURL *eh;
239 :
240 0 : igh = GNUNET_new (struct TALER_MERCHANT_InstancesGetHandle);
241 0 : igh->ctx = ctx;
242 0 : igh->cb = instances_cb;
243 0 : igh->cb_cls = instances_cb_cls;
244 0 : igh->url = TALER_url_join (backend_url,
245 : "management/instances",
246 : NULL);
247 0 : if (NULL == igh->url)
248 : {
249 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
250 : "Could not construct request URL.\n");
251 0 : GNUNET_free (igh);
252 0 : return NULL;
253 : }
254 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
255 : "Requesting URL '%s'\n",
256 : igh->url);
257 0 : eh = TALER_MERCHANT_curl_easy_get_ (igh->url);
258 0 : igh->job = GNUNET_CURL_job_add (ctx,
259 : eh,
260 : &handle_instances_finished,
261 : igh);
262 0 : return igh;
263 : }
264 :
265 :
266 : void
267 0 : TALER_MERCHANT_instances_get_cancel (
268 : struct TALER_MERCHANT_InstancesGetHandle *igh)
269 : {
270 0 : if (NULL != igh->job)
271 0 : GNUNET_CURL_job_cancel (igh->job);
272 0 : GNUNET_free (igh->url);
273 0 : GNUNET_free (igh);
274 0 : }
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