Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022 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_accounts.c
19 : * @brief Implementation of the GET /accounts 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 : * Maximum number of accounts permitted.
35 : */
36 : #define MAX_ACCOUNTS 1024
37 :
38 : /**
39 : * Handle for a GET /accounts operation.
40 : */
41 : struct TALER_MERCHANT_AccountsGetHandle
42 : {
43 : /**
44 : * The url for this request.
45 : */
46 : char *url;
47 :
48 : /**
49 : * Handle for the request.
50 : */
51 : struct GNUNET_CURL_Job *job;
52 :
53 : /**
54 : * Function to call with the result.
55 : */
56 : TALER_MERCHANT_AccountsGetCallback cb;
57 :
58 : /**
59 : * Closure for @a cb.
60 : */
61 : void *cb_cls;
62 :
63 : /**
64 : * Reference to the execution context.
65 : */
66 : struct GNUNET_CURL_Context *ctx;
67 :
68 : };
69 :
70 :
71 : /**
72 : * Parse account information from @a ia.
73 : *
74 : * @param ia JSON array (or NULL!) with account data
75 : * @param[in] tgr partially filled response
76 : * @param tgh operation handle
77 : * @return #GNUNET_OK on success
78 : */
79 : static enum GNUNET_GenericReturnValue
80 0 : parse_accounts (const json_t *ia,
81 : struct TALER_MERCHANT_AccountsGetResponse *tgr,
82 : struct TALER_MERCHANT_AccountsGetHandle *tgh)
83 : {
84 0 : unsigned int tmpl_len = (unsigned int) json_array_size (ia);
85 :
86 0 : if ( (json_array_size (ia) != (size_t) tmpl_len) ||
87 : (tmpl_len > MAX_ACCOUNTS) )
88 : {
89 0 : GNUNET_break (0);
90 0 : return GNUNET_SYSERR;
91 : }
92 0 : {
93 0 : struct TALER_MERCHANT_AccountEntry tmpl[GNUNET_NZL (tmpl_len)];
94 : size_t index;
95 : json_t *value;
96 :
97 0 : json_array_foreach (ia, index, value) {
98 0 : struct TALER_MERCHANT_AccountEntry *ie = &tmpl[index];
99 : struct GNUNET_JSON_Specification spec[] = {
100 0 : TALER_JSON_spec_full_payto_uri ("payto_uri",
101 : &ie->payto_uri),
102 0 : GNUNET_JSON_spec_fixed_auto ("h_wire",
103 : &ie->h_wire),
104 0 : GNUNET_JSON_spec_end ()
105 : };
106 :
107 0 : if (GNUNET_OK !=
108 0 : GNUNET_JSON_parse (value,
109 : spec,
110 : NULL, NULL))
111 : {
112 0 : GNUNET_break_op (0);
113 0 : return GNUNET_SYSERR;
114 : }
115 : }
116 0 : tgr->details.ok.accounts_length = tmpl_len;
117 0 : tgr->details.ok.accounts = tmpl;
118 0 : tgh->cb (tgh->cb_cls,
119 : tgr);
120 0 : tgh->cb = NULL; /* just to be sure */
121 : }
122 0 : return GNUNET_OK;
123 : }
124 :
125 :
126 : /**
127 : * Function called when we're done processing the
128 : * HTTP /accounts request.
129 : *
130 : * @param cls the `struct TALER_MERCHANT_AccountsGetHandle`
131 : * @param response_code HTTP response code, 0 on error
132 : * @param response response body, NULL if not in JSON
133 : */
134 : static void
135 0 : handle_get_accounts_finished (void *cls,
136 : long response_code,
137 : const void *response)
138 : {
139 0 : struct TALER_MERCHANT_AccountsGetHandle *tgh = cls;
140 0 : const json_t *json = response;
141 0 : struct TALER_MERCHANT_AccountsGetResponse tgr = {
142 0 : .hr.http_status = (unsigned int) response_code,
143 : .hr.reply = json
144 : };
145 :
146 0 : tgh->job = NULL;
147 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
148 : "Got /accounts response with status code %u\n",
149 : (unsigned int) response_code);
150 0 : switch (response_code)
151 : {
152 0 : case MHD_HTTP_OK:
153 : {
154 : const json_t *accounts;
155 : struct GNUNET_JSON_Specification spec[] = {
156 0 : GNUNET_JSON_spec_array_const ("accounts",
157 : &accounts),
158 0 : GNUNET_JSON_spec_end ()
159 : };
160 :
161 0 : if (GNUNET_OK !=
162 0 : GNUNET_JSON_parse (json,
163 : spec,
164 : NULL, NULL))
165 : {
166 0 : tgr.hr.http_status = 0;
167 0 : tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
168 0 : break;
169 : }
170 0 : if (GNUNET_OK ==
171 0 : parse_accounts (accounts,
172 : &tgr,
173 : tgh))
174 : {
175 0 : TALER_MERCHANT_accounts_get_cancel (tgh);
176 0 : return;
177 : }
178 0 : tgr.hr.http_status = 0;
179 0 : tgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
180 0 : break;
181 : }
182 0 : case MHD_HTTP_UNAUTHORIZED:
183 0 : tgr.hr.ec = TALER_JSON_get_error_code (json);
184 0 : tgr.hr.hint = TALER_JSON_get_error_hint (json);
185 : /* Nothing really to verify, merchant says we need to authenticate. */
186 0 : break;
187 0 : default:
188 : /* unexpected response code */
189 0 : tgr.hr.ec = TALER_JSON_get_error_code (json);
190 0 : tgr.hr.hint = TALER_JSON_get_error_hint (json);
191 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
192 : "Unexpected response code %u/%d\n",
193 : (unsigned int) response_code,
194 : (int) tgr.hr.ec);
195 0 : break;
196 : }
197 0 : tgh->cb (tgh->cb_cls,
198 : &tgr);
199 0 : TALER_MERCHANT_accounts_get_cancel (tgh);
200 : }
201 :
202 :
203 : struct TALER_MERCHANT_AccountsGetHandle *
204 0 : TALER_MERCHANT_accounts_get (
205 : struct GNUNET_CURL_Context *ctx,
206 : const char *backend_url,
207 : TALER_MERCHANT_AccountsGetCallback cb,
208 : void *cb_cls)
209 : {
210 : struct TALER_MERCHANT_AccountsGetHandle *tgh;
211 : CURL *eh;
212 :
213 0 : tgh = GNUNET_new (struct TALER_MERCHANT_AccountsGetHandle);
214 0 : tgh->ctx = ctx;
215 0 : tgh->cb = cb;
216 0 : tgh->cb_cls = cb_cls;
217 0 : tgh->url = TALER_url_join (backend_url,
218 : "private/accounts",
219 : NULL);
220 0 : if (NULL == tgh->url)
221 : {
222 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
223 : "Could not construct request URL.\n");
224 0 : GNUNET_free (tgh);
225 0 : return NULL;
226 : }
227 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
228 : "Requesting URL '%s'\n",
229 : tgh->url);
230 0 : eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
231 0 : tgh->job = GNUNET_CURL_job_add (ctx,
232 : eh,
233 : &handle_get_accounts_finished,
234 : tgh);
235 0 : return tgh;
236 : }
237 :
238 :
239 : void
240 0 : TALER_MERCHANT_accounts_get_cancel (
241 : struct TALER_MERCHANT_AccountsGetHandle *tgh)
242 : {
243 0 : if (NULL != tgh->job)
244 0 : GNUNET_CURL_job_cancel (tgh->job);
245 0 : GNUNET_free (tgh->url);
246 0 : GNUNET_free (tgh);
247 0 : }
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