Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014-2021 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_post_order_refund.c
19 : * @brief Implementation of the POST /orders/ID/refund request
20 : * @author Christian Grothoff
21 : * @author Marcello Stanisci
22 : */
23 : #include "platform.h"
24 : #include <curl/curl.h>
25 : #include <jansson.h>
26 : #include <microhttpd.h> /* just for HTTP status codes */
27 : #include <gnunet/gnunet_util_lib.h>
28 : #include <gnunet/gnunet_curl_lib.h>
29 : #include "taler_merchant_service.h"
30 : #include "merchant_api_curl_defaults.h"
31 : #include <taler/taler_json_lib.h>
32 : #include <taler/taler_signatures.h>
33 : #include <taler/taler_curl_lib.h>
34 :
35 :
36 : /**
37 : * Handle for a POST /orders/ID/refund operation.
38 : */
39 : struct TALER_MERCHANT_OrderRefundHandle
40 : {
41 : /**
42 : * Complete URL where the backend offers /refund
43 : */
44 : char *url;
45 :
46 : /**
47 : * Minor context that holds body and headers.
48 : */
49 : struct TALER_CURL_PostContext post_ctx;
50 :
51 : /**
52 : * The CURL context to connect to the backend
53 : */
54 : struct GNUNET_CURL_Context *ctx;
55 :
56 : /**
57 : * The callback to pass the backend response to
58 : */
59 : TALER_MERCHANT_RefundCallback cb;
60 :
61 : /**
62 : * Clasure to pass to the callback
63 : */
64 : void *cb_cls;
65 :
66 : /**
67 : * Handle for the request
68 : */
69 : struct GNUNET_CURL_Job *job;
70 : };
71 :
72 :
73 : /**
74 : * Callback to process POST /orders/ID/refund response
75 : *
76 : * @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
77 : * @param response_code HTTP response code, 0 on error
78 : * @param response response body, NULL if not JSON
79 : */
80 : static void
81 0 : handle_refund_finished (void *cls,
82 : long response_code,
83 : const void *response)
84 : {
85 0 : struct TALER_MERCHANT_OrderRefundHandle *orh = cls;
86 0 : const json_t *json = response;
87 0 : struct TALER_MERCHANT_HttpResponse hr = {
88 0 : .http_status = (unsigned int) response_code,
89 : .reply = json
90 : };
91 :
92 0 : orh->job = NULL;
93 0 : switch (response_code)
94 : {
95 0 : case 0:
96 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
97 0 : orh->cb (orh->cb_cls,
98 : &hr,
99 : NULL,
100 : NULL);
101 0 : break;
102 0 : case MHD_HTTP_OK:
103 : {
104 : const char *taler_refund_uri;
105 : struct TALER_PrivateContractHashP h_contract;
106 : struct GNUNET_JSON_Specification spec[] = {
107 0 : GNUNET_JSON_spec_string ("taler_refund_uri",
108 : &taler_refund_uri),
109 0 : GNUNET_JSON_spec_fixed_auto ("h_contract",
110 : &h_contract),
111 0 : GNUNET_JSON_spec_end ()
112 : };
113 :
114 0 : if (GNUNET_OK !=
115 0 : GNUNET_JSON_parse (json,
116 : spec,
117 : NULL, NULL))
118 : {
119 0 : GNUNET_break_op (0);
120 0 : hr.http_status = 0;
121 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
122 0 : orh->cb (orh->cb_cls,
123 : &hr,
124 : NULL,
125 : NULL);
126 0 : break;
127 : }
128 0 : orh->cb (orh->cb_cls,
129 : &hr,
130 : taler_refund_uri,
131 : &h_contract);
132 0 : GNUNET_JSON_parse_free (spec);
133 : }
134 0 : break;
135 0 : case MHD_HTTP_UNAUTHORIZED:
136 0 : hr.ec = TALER_JSON_get_error_code (json);
137 0 : hr.hint = TALER_JSON_get_error_hint (json);
138 : /* Nothing really to verify, merchant says we need to authenticate. */
139 0 : break;
140 0 : case MHD_HTTP_FORBIDDEN:
141 0 : hr.ec = TALER_JSON_get_error_code (json);
142 0 : hr.hint = TALER_JSON_get_error_hint (json);
143 : /* Nothing really to verify, merchant says we need to authenticate. */
144 0 : break;
145 0 : case MHD_HTTP_NOT_FOUND:
146 : case MHD_HTTP_CONFLICT:
147 0 : hr.ec = TALER_JSON_get_error_code (json);
148 0 : hr.hint = TALER_JSON_get_error_hint (json);
149 0 : orh->cb (orh->cb_cls,
150 : &hr,
151 : NULL,
152 : NULL);
153 0 : break;
154 0 : default:
155 0 : GNUNET_break_op (0); /* unexpected status code */
156 0 : TALER_MERCHANT_parse_error_details_ (json,
157 : response_code,
158 : &hr);
159 0 : orh->cb (orh->cb_cls,
160 : &hr,
161 : NULL,
162 : NULL);
163 0 : break;
164 : }
165 0 : TALER_MERCHANT_post_order_refund_cancel (orh);
166 0 : }
167 :
168 :
169 : void
170 0 : TALER_MERCHANT_post_order_refund_cancel (
171 : struct TALER_MERCHANT_OrderRefundHandle *orh)
172 : {
173 0 : if (NULL != orh->job)
174 : {
175 0 : GNUNET_CURL_job_cancel (orh->job);
176 0 : orh->job = NULL;
177 : }
178 0 : TALER_curl_easy_post_finished (&orh->post_ctx);
179 0 : GNUNET_free (orh->url);
180 0 : GNUNET_free (orh);
181 0 : }
182 :
183 :
184 : struct TALER_MERCHANT_OrderRefundHandle *
185 0 : TALER_MERCHANT_post_order_refund (struct GNUNET_CURL_Context *ctx,
186 : const char *backend_url,
187 : const char *order_id,
188 : const struct TALER_Amount *refund,
189 : const char *reason,
190 : TALER_MERCHANT_RefundCallback cb,
191 : void *cb_cls)
192 : {
193 : struct TALER_MERCHANT_OrderRefundHandle *orh;
194 : json_t *req;
195 : CURL *eh;
196 :
197 0 : orh = GNUNET_new (struct TALER_MERCHANT_OrderRefundHandle);
198 0 : orh->ctx = ctx;
199 0 : orh->cb = cb;
200 0 : orh->cb_cls = cb_cls;
201 : {
202 : char *path;
203 :
204 0 : GNUNET_asprintf (&path,
205 : "private/orders/%s/refund",
206 : order_id);
207 0 : orh->url = TALER_url_join (backend_url,
208 : path,
209 : NULL);
210 0 : GNUNET_free (path);
211 : }
212 0 : if (NULL == orh->url)
213 : {
214 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
215 : "Could not construct request URL.\n");
216 0 : GNUNET_free (orh);
217 0 : return NULL;
218 : }
219 0 : req = GNUNET_JSON_PACK (
220 : TALER_JSON_pack_amount ("refund",
221 : refund),
222 : GNUNET_JSON_pack_string ("reason",
223 : reason));
224 0 : GNUNET_assert (NULL != req);
225 0 : eh = TALER_MERCHANT_curl_easy_get_ (orh->url);
226 0 : if (GNUNET_OK !=
227 0 : TALER_curl_easy_post (&orh->post_ctx,
228 : eh,
229 : req))
230 : {
231 0 : GNUNET_break (0);
232 0 : curl_easy_cleanup (eh);
233 0 : json_decref (req);
234 0 : GNUNET_free (orh->url);
235 0 : GNUNET_free (orh);
236 0 : return NULL;
237 : }
238 0 : json_decref (req);
239 0 : orh->job = GNUNET_CURL_job_add2 (ctx,
240 : eh,
241 0 : orh->post_ctx.headers,
242 : &handle_refund_finished,
243 : orh);
244 0 : if (NULL == orh->job)
245 : {
246 0 : GNUNET_free (orh->url);
247 0 : GNUNET_free (orh);
248 0 : return NULL;
249 : }
250 0 : return orh;
251 : }
252 :
253 :
254 : /* end of merchant_api_post_order_refund.c */
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