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_wallet_get_tip.c
19 : * @brief Implementation of the GET /tips/$TIP_ID request of the merchant's HTTP API
20 : * @author Florian Dold
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 :
33 :
34 : /**
35 : * @brief A handle for tracking /tip-get operations
36 : */
37 : struct TALER_MERCHANT_TipWalletGetHandle
38 : {
39 : /**
40 : * The url for this request.
41 : */
42 : char *url;
43 :
44 : /**
45 : * Handle for the request.
46 : */
47 : struct GNUNET_CURL_Job *job;
48 :
49 : /**
50 : * Function to call with the result.
51 : */
52 : TALER_MERCHANT_TipWalletGetCallback cb;
53 :
54 : /**
55 : * Closure for @a cb.
56 : */
57 : void *cb_cls;
58 :
59 : /**
60 : * Reference to the execution context.
61 : */
62 : struct GNUNET_CURL_Context *ctx;
63 :
64 : };
65 :
66 :
67 : /**
68 : * Function called when we're done processing the
69 : * HTTP /track/transaction request.
70 : *
71 : * @param cls the `struct TALER_MERCHANT_TipGetHandle`
72 : * @param response_code HTTP response code, 0 on error
73 : * @param response response body, NULL if not in JSON
74 : */
75 : static void
76 0 : handle_wallet_tip_get_finished (void *cls,
77 : long response_code,
78 : const void *response)
79 : {
80 0 : struct TALER_MERCHANT_TipWalletGetHandle *tgh = cls;
81 0 : const json_t *json = response;
82 0 : struct TALER_MERCHANT_HttpResponse hr = {
83 0 : .http_status = (unsigned int) response_code,
84 : .reply = json
85 : };
86 :
87 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
88 : "Got /tip/$TIP_ID response with status code %u\n",
89 : (unsigned int) response_code);
90 :
91 0 : tgh->job = NULL;
92 0 : switch (response_code)
93 : {
94 0 : case MHD_HTTP_OK:
95 : {
96 : const char *exchange_url;
97 : struct TALER_Amount amount_remaining;
98 : struct GNUNET_TIME_Timestamp expiration;
99 : struct GNUNET_JSON_Specification spec[] = {
100 0 : GNUNET_JSON_spec_timestamp ("expiration",
101 : &expiration),
102 0 : GNUNET_JSON_spec_string ("exchange_url",
103 : &exchange_url),
104 0 : TALER_JSON_spec_amount_any ("tip_amount",
105 : &amount_remaining),
106 0 : GNUNET_JSON_spec_end ()
107 : };
108 :
109 0 : if (GNUNET_OK !=
110 0 : GNUNET_JSON_parse (json,
111 : spec,
112 : NULL, NULL))
113 : {
114 0 : GNUNET_break_op (0);
115 0 : hr.http_status = 0;
116 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
117 0 : break;
118 : }
119 0 : tgh->cb (tgh->cb_cls,
120 : &hr,
121 : expiration,
122 : exchange_url,
123 : &amount_remaining);
124 0 : TALER_MERCHANT_wallet_tip_get_cancel (tgh);
125 0 : return;
126 : }
127 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
128 : /* Server had an internal issue; we should retry, but this API
129 : leaves this to the application */
130 0 : hr.ec = TALER_JSON_get_error_code (json);
131 0 : hr.hint = TALER_JSON_get_error_hint (json);
132 0 : break;
133 0 : case MHD_HTTP_NOT_FOUND:
134 : /* legal, can happen if instance or tip reserve is unknown */
135 0 : hr.ec = TALER_JSON_get_error_code (json);
136 0 : hr.hint = TALER_JSON_get_error_hint (json);
137 0 : break;
138 0 : default:
139 : /* unexpected response code */
140 0 : GNUNET_break_op (0);
141 0 : TALER_MERCHANT_parse_error_details_ (json,
142 : response_code,
143 : &hr);
144 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
145 : "Unexpected response code %u/%d\n",
146 : (unsigned int) response_code,
147 : (int) hr.ec);
148 0 : break;
149 : }
150 0 : tgh->cb (tgh->cb_cls,
151 : &hr,
152 0 : GNUNET_TIME_UNIT_ZERO_TS,
153 : NULL,
154 : NULL);
155 0 : TALER_MERCHANT_wallet_tip_get_cancel (tgh);
156 : }
157 :
158 :
159 : struct TALER_MERCHANT_TipWalletGetHandle *
160 0 : TALER_MERCHANT_wallet_tip_get (struct GNUNET_CURL_Context *ctx,
161 : const char *backend_url,
162 : const struct TALER_TipIdentifierP *tip_id,
163 : TALER_MERCHANT_TipWalletGetCallback cb,
164 : void *cb_cls)
165 : {
166 : struct TALER_MERCHANT_TipWalletGetHandle *tgh;
167 : CURL *eh;
168 :
169 0 : tgh = GNUNET_new (struct TALER_MERCHANT_TipWalletGetHandle);
170 0 : tgh->ctx = ctx;
171 0 : tgh->cb = cb;
172 0 : tgh->cb_cls = cb_cls;
173 : {
174 : char res_str[sizeof (*tip_id) * 2];
175 : char arg_str[sizeof (res_str) + 48];
176 : char *end;
177 :
178 0 : end = GNUNET_STRINGS_data_to_string (tip_id,
179 : sizeof (*tip_id),
180 : res_str,
181 : sizeof (res_str));
182 0 : *end = '\0';
183 0 : GNUNET_snprintf (arg_str,
184 : sizeof (arg_str),
185 : "tips/%s",
186 : res_str);
187 0 : tgh->url = TALER_url_join (backend_url,
188 : arg_str,
189 : NULL);
190 : }
191 :
192 0 : if (NULL == tgh->url)
193 : {
194 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
195 : "Could not construct request URL.\n");
196 0 : GNUNET_free (tgh);
197 0 : return NULL;
198 : }
199 :
200 0 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
201 : "Requesting URL '%s'\n",
202 : tgh->url);
203 0 : eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
204 0 : tgh->job = GNUNET_CURL_job_add (ctx,
205 : eh,
206 : &handle_wallet_tip_get_finished,
207 : tgh);
208 0 : return tgh;
209 : }
210 :
211 :
212 : void
213 0 : TALER_MERCHANT_wallet_tip_get_cancel (
214 : struct TALER_MERCHANT_TipWalletGetHandle *tgh)
215 : {
216 0 : if (NULL != tgh->job)
217 : {
218 0 : GNUNET_CURL_job_cancel (tgh->job);
219 0 : tgh->job = NULL;
220 : }
221 0 : GNUNET_free (tgh->url);
222 0 : GNUNET_free (tgh);
223 0 : }
224 :
225 :
226 : /* end of merchant_api_wallet_get_tip.c */
|
