Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2023 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 : * Maximum number of instances permitted.
36 : */
37 : #define MAX_INSTANCES 1024
38 :
39 : /**
40 : * Handle for a GET /instances operation.
41 : */
42 : struct TALER_MERCHANT_InstancesGetHandle
43 : {
44 : /**
45 : * The url for this request.
46 : */
47 : char *url;
48 :
49 : /**
50 : * Handle for the request.
51 : */
52 : struct GNUNET_CURL_Job *job;
53 :
54 : /**
55 : * Function to call with the result.
56 : */
57 : TALER_MERCHANT_InstancesGetCallback cb;
58 :
59 : /**
60 : * Closure for @a cb.
61 : */
62 : void *cb_cls;
63 :
64 : /**
65 : * Reference to the execution context.
66 : */
67 : struct GNUNET_CURL_Context *ctx;
68 :
69 : };
70 :
71 :
72 : /**
73 : * Parse instance information from @a ia.
74 : *
75 : * @param json overall reply body
76 : * @param ia JSON array (or NULL!) with instance data
77 : * @param igh operation handle
78 : * @return #GNUNET_OK on success
79 : */
80 : static enum GNUNET_GenericReturnValue
81 5 : parse_instances (const json_t *json,
82 : const json_t *ia,
83 : struct TALER_MERCHANT_InstancesGetHandle *igh)
84 : {
85 5 : unsigned int iis_len = (unsigned int) json_array_size (ia);
86 :
87 5 : if ( (json_array_size (ia) != (size_t) iis_len) ||
88 : (iis_len > MAX_INSTANCES) )
89 : {
90 0 : GNUNET_break (0);
91 0 : return GNUNET_SYSERR;
92 : }
93 5 : {
94 5 : struct TALER_MERCHANT_InstanceInformation iis[GNUNET_NZL (iis_len)];
95 : size_t index;
96 : json_t *value;
97 5 : struct TALER_MERCHANT_InstancesGetResponse igr = {
98 : .hr.http_status = MHD_HTTP_OK,
99 : .hr.reply = json,
100 : .details.ok.iis_length = iis_len,
101 : .details.ok.iis = iis
102 : };
103 :
104 9 : json_array_foreach (ia, index, value) {
105 4 : struct TALER_MERCHANT_InstanceInformation *ii = &iis[index];
106 : struct GNUNET_JSON_Specification spec[] = {
107 4 : GNUNET_JSON_spec_string ("name",
108 : &ii->name),
109 4 : GNUNET_JSON_spec_string ("id",
110 : &ii->id),
111 4 : GNUNET_JSON_spec_fixed_auto ("merchant_pub",
112 : &ii->merchant_pub),
113 4 : GNUNET_JSON_spec_array_const ("payment_targets",
114 : &ii->payment_targets),
115 4 : GNUNET_JSON_spec_end ()
116 : };
117 :
118 4 : if (GNUNET_OK !=
119 4 : GNUNET_JSON_parse (value,
120 : spec,
121 : NULL, NULL))
122 : {
123 0 : GNUNET_break_op (0);
124 0 : return GNUNET_SYSERR;
125 : }
126 6 : for (size_t i = 0; i<json_array_size (ii->payment_targets); i++)
127 : {
128 2 : if (! json_is_string (json_array_get (ii->payment_targets,
129 : i)))
130 : {
131 0 : GNUNET_break_op (0);
132 0 : return GNUNET_SYSERR;
133 : }
134 : }
135 : } /* for all instances */
136 5 : igh->cb (igh->cb_cls,
137 : &igr);
138 5 : igh->cb = NULL; /* just to be sure */
139 : }
140 5 : return GNUNET_OK;
141 : }
142 :
143 :
144 : /**
145 : * Function called when we're done processing the
146 : * HTTP /instances request.
147 : *
148 : * @param cls the `struct TALER_MERCHANT_InstancesGetHandle`
149 : * @param response_code HTTP response code, 0 on error
150 : * @param response response body, NULL if not in JSON
151 : */
152 : static void
153 5 : handle_instances_finished (void *cls,
154 : long response_code,
155 : const void *response)
156 : {
157 5 : struct TALER_MERCHANT_InstancesGetHandle *igh = cls;
158 5 : const json_t *json = response;
159 5 : struct TALER_MERCHANT_InstancesGetResponse igr = {
160 5 : .hr.http_status = (unsigned int) response_code,
161 : .hr.reply = json
162 : };
163 :
164 5 : igh->job = NULL;
165 5 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
166 : "Got /instances response with status code %u\n",
167 : (unsigned int) response_code);
168 5 : switch (response_code)
169 : {
170 5 : case MHD_HTTP_OK:
171 : {
172 : const json_t *instances;
173 : struct GNUNET_JSON_Specification spec[] = {
174 5 : GNUNET_JSON_spec_array_const ("instances",
175 : &instances),
176 5 : GNUNET_JSON_spec_end ()
177 : };
178 :
179 5 : if (GNUNET_OK !=
180 5 : GNUNET_JSON_parse (json,
181 : spec,
182 : NULL, NULL))
183 : {
184 0 : igr.hr.http_status = 0;
185 0 : igr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
186 0 : break;
187 : }
188 5 : if (GNUNET_OK ==
189 5 : parse_instances (json,
190 : instances,
191 : igh))
192 : {
193 5 : TALER_MERCHANT_instances_get_cancel (igh);
194 5 : return;
195 : }
196 0 : igr.hr.http_status = 0;
197 0 : igr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
198 0 : break;
199 : }
200 0 : case MHD_HTTP_UNAUTHORIZED:
201 0 : igr.hr.ec = TALER_JSON_get_error_code (json);
202 0 : igr.hr.hint = TALER_JSON_get_error_hint (json);
203 0 : break;
204 0 : default:
205 : /* unexpected response code */
206 0 : igr.hr.ec = TALER_JSON_get_error_code (json);
207 0 : igr.hr.hint = TALER_JSON_get_error_hint (json);
208 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
209 : "Unexpected response code %u/%d\n",
210 : (unsigned int) response_code,
211 : (int) igr.hr.ec);
212 0 : break;
213 : }
214 0 : igh->cb (igh->cb_cls,
215 : &igr);
216 0 : TALER_MERCHANT_instances_get_cancel (igh);
217 : }
218 :
219 :
220 : struct TALER_MERCHANT_InstancesGetHandle *
221 5 : TALER_MERCHANT_instances_get (struct GNUNET_CURL_Context *ctx,
222 : const char *backend_url,
223 : TALER_MERCHANT_InstancesGetCallback instances_cb,
224 : void *instances_cb_cls)
225 : {
226 : struct TALER_MERCHANT_InstancesGetHandle *igh;
227 : CURL *eh;
228 :
229 5 : igh = GNUNET_new (struct TALER_MERCHANT_InstancesGetHandle);
230 5 : igh->ctx = ctx;
231 5 : igh->cb = instances_cb;
232 5 : igh->cb_cls = instances_cb_cls;
233 5 : igh->url = TALER_url_join (backend_url,
234 : "management/instances",
235 : NULL);
236 5 : if (NULL == igh->url)
237 : {
238 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
239 : "Could not construct request URL.\n");
240 0 : GNUNET_free (igh);
241 0 : return NULL;
242 : }
243 5 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
244 : "Requesting URL '%s'\n",
245 : igh->url);
246 5 : eh = TALER_MERCHANT_curl_easy_get_ (igh->url);
247 5 : igh->job = GNUNET_CURL_job_add (ctx,
248 : eh,
249 : &handle_instances_finished,
250 : igh);
251 5 : return igh;
252 : }
253 :
254 :
255 : void
256 5 : TALER_MERCHANT_instances_get_cancel (
257 : struct TALER_MERCHANT_InstancesGetHandle *igh)
258 : {
259 5 : if (NULL != igh->job)
260 0 : GNUNET_CURL_job_cancel (igh->job);
261 5 : GNUNET_free (igh->url);
262 5 : GNUNET_free (igh);
263 5 : }
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