Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2014, 2015, 2016, 2017, 2019, 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 lib/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 <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 : #include <taler/taler_curl_lib.h>
33 :
34 :
35 : /**
36 : * Handle for a POST /orders/ID/refund operation.
37 : */
38 : struct TALER_MERCHANT_OrderRefundHandle
39 : {
40 : /**
41 : * Complete URL where the backend offers /refund
42 : */
43 : char *url;
44 :
45 : /**
46 : * Minor context that holds body and headers.
47 : */
48 : struct TALER_CURL_PostContext post_ctx;
49 :
50 : /**
51 : * The CURL context to connect to the backend
52 : */
53 : struct GNUNET_CURL_Context *ctx;
54 :
55 : /**
56 : * The callback to pass the backend response to
57 : */
58 : TALER_MERCHANT_RefundCallback cb;
59 :
60 : /**
61 : * Clasure to pass to the callback
62 : */
63 : void *cb_cls;
64 :
65 : /**
66 : * Handle for the request
67 : */
68 : struct GNUNET_CURL_Job *job;
69 : };
70 :
71 :
72 : /**
73 : * Callback to process POST /orders/ID/refund response
74 : *
75 : * @param cls the `struct TALER_MERCHANT_OrderRefundHandle`
76 : * @param response_code HTTP response code, 0 on error
77 : * @param json response body, NULL if not JSON
78 : */
79 : static void
80 0 : handle_refund_finished (void *cls,
81 : long response_code,
82 : const void *response)
83 : {
84 0 : struct TALER_MERCHANT_OrderRefundHandle *orh = cls;
85 0 : const json_t *json = response;
86 0 : struct TALER_MERCHANT_HttpResponse hr = {
87 0 : .http_status = (unsigned int) response_code,
88 : .reply = json
89 : };
90 :
91 0 : orh->job = NULL;
92 0 : switch (response_code)
93 : {
94 0 : case 0:
95 0 : hr.ec = TALER_EC_INVALID_RESPONSE;
96 0 : orh->cb (orh->cb_cls,
97 : &hr);
98 0 : break;
99 0 : case MHD_HTTP_OK:
100 0 : orh->cb (orh->cb_cls,
101 : &hr);
102 0 : break;
103 0 : case MHD_HTTP_CONFLICT:
104 : case MHD_HTTP_NOT_FOUND:
105 0 : hr.ec = TALER_JSON_get_error_code (json);
106 0 : hr.hint = TALER_JSON_get_error_hint (json);
107 0 : orh->cb (orh->cb_cls,
108 : &hr);
109 0 : break;
110 0 : default:
111 0 : GNUNET_break_op (0); /* unexpected status code */
112 0 : TALER_MERCHANT_parse_error_details_ (json,
113 : response_code,
114 : &hr);
115 0 : orh->cb (orh->cb_cls,
116 : &hr);
117 0 : break;
118 : }
119 0 : TALER_MERCHANT_post_order_refund_cancel (orh);
120 0 : }
121 :
122 :
123 : /**
124 : * Cancel a POST /orders/ID/refund request.
125 : *
126 : * @param orh the refund increasing operation to cancel
127 : */
128 : void
129 0 : TALER_MERCHANT_post_order_refund_cancel (
130 : struct TALER_MERCHANT_OrderRefundHandle *orh)
131 : {
132 0 : if (NULL != orh->job)
133 : {
134 0 : GNUNET_CURL_job_cancel (orh->job);
135 0 : orh->job = NULL;
136 : }
137 0 : TALER_curl_easy_post_finished (&orh->post_ctx);
138 0 : GNUNET_free (orh->url);
139 0 : GNUNET_free (orh);
140 0 : }
141 :
142 :
143 : /**
144 : * Increase the refund granted for an order
145 : *
146 : * @param ctx the CURL context used to connect to the backend
147 : * @param backend_url backend's base URL, including final "/"
148 : * @param order_id id of the order whose refund is to be increased
149 : * @param refund amount to which increase the refund
150 : * @param reason human-readable reason justifying the refund
151 : * @param cb callback processing the response from /refund
152 : * @param cb_cls closure for cb
153 : */
154 : struct TALER_MERCHANT_OrderRefundHandle *
155 0 : TALER_MERCHANT_post_order_refund (struct GNUNET_CURL_Context *ctx,
156 : const char *backend_url,
157 : const char *order_id,
158 : const struct TALER_Amount *refund,
159 : const char *reason,
160 : TALER_MERCHANT_RefundCallback cb,
161 : void *cb_cls)
162 : {
163 : struct TALER_MERCHANT_OrderRefundHandle *orh;
164 : json_t *req;
165 : CURL *eh;
166 :
167 0 : orh = GNUNET_new (struct TALER_MERCHANT_OrderRefundHandle);
168 0 : orh->ctx = ctx;
169 0 : orh->cb = cb;
170 0 : orh->cb_cls = cb_cls;
171 : {
172 : char *path;
173 :
174 0 : GNUNET_asprintf (&path,
175 : "private/orders/%s/refund",
176 : order_id);
177 0 : orh->url = TALER_url_join (backend_url,
178 : path,
179 : NULL);
180 0 : GNUNET_free (path);
181 : }
182 0 : if (NULL == orh->url)
183 : {
184 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
185 : "Could not construct request URL.\n");
186 0 : GNUNET_free (orh);
187 0 : return NULL;
188 : }
189 0 : req = json_pack ("{s:o, s:s}",
190 : "refund", TALER_JSON_from_amount (refund),
191 : "reason", reason);
192 0 : GNUNET_assert (NULL != req);
193 0 : eh = curl_easy_init ();
194 0 : GNUNET_assert (NULL != eh);
195 0 : if (GNUNET_OK !=
196 0 : TALER_curl_easy_post (&orh->post_ctx,
197 : eh,
198 : req))
199 : {
200 0 : GNUNET_break (0);
201 0 : json_decref (req);
202 0 : GNUNET_free (orh->url);
203 0 : GNUNET_free (orh);
204 0 : return NULL;
205 : }
206 0 : json_decref (req);
207 0 : GNUNET_assert (CURLE_OK ==
208 : curl_easy_setopt (eh,
209 : CURLOPT_URL,
210 : orh->url));
211 0 : orh->job = GNUNET_CURL_job_add2 (ctx,
212 : eh,
213 0 : orh->post_ctx.headers,
214 : &handle_refund_finished,
215 : orh);
216 0 : if (NULL == orh->job)
217 : {
218 0 : GNUNET_free (orh->url);
219 0 : GNUNET_free (orh);
220 0 : return NULL;
221 : }
222 0 : return orh;
223 : }
224 :
225 :
226 : /* end of merchant_api_post_order_refund.c */
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