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_templates.c
19 : * @brief Implementation of the GET /templates request of the merchant's HTTP API
20 : * @author Priscilla HUANG
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 templates we return.
36 : */
37 : #define MAX_TEMPLATES 1024
38 :
39 :
40 : /**
41 : * Handle for a GET /templates operation.
42 : */
43 : struct TALER_MERCHANT_TemplatesGetHandle
44 : {
45 : /**
46 : * The url for this request.
47 : */
48 : char *url;
49 :
50 : /**
51 : * Handle for the request.
52 : */
53 : struct GNUNET_CURL_Job *job;
54 :
55 : /**
56 : * Function to call with the result.
57 : */
58 : TALER_MERCHANT_TemplatesGetCallback cb;
59 :
60 : /**
61 : * Closure for @a cb.
62 : */
63 : void *cb_cls;
64 :
65 : /**
66 : * Reference to the execution context.
67 : */
68 : struct GNUNET_CURL_Context *ctx;
69 :
70 : };
71 :
72 :
73 : /**
74 : * Parse template information from @a ia.
75 : *
76 : * @param ia JSON array (or NULL!) with template data
77 : * @param[in] tgr partially filled response
78 : * @param tgh operation handle
79 : * @return #GNUNET_OK on success
80 : */
81 : static enum GNUNET_GenericReturnValue
82 4 : parse_templates (const json_t *ia,
83 : struct TALER_MERCHANT_TemplatesGetResponse *tgr,
84 : struct TALER_MERCHANT_TemplatesGetHandle *tgh)
85 : {
86 4 : unsigned int tmpl_len = (unsigned int) json_array_size (ia);
87 :
88 4 : if ( (json_array_size (ia) != (size_t) tmpl_len) ||
89 : (tmpl_len > MAX_TEMPLATES) )
90 : {
91 0 : GNUNET_break (0);
92 0 : return GNUNET_SYSERR;
93 : }
94 4 : {
95 4 : struct TALER_MERCHANT_TemplateEntry tmpl[GNUNET_NZL (tmpl_len)];
96 : size_t index;
97 : json_t *value;
98 :
99 6 : json_array_foreach (ia, index, value) {
100 2 : struct TALER_MERCHANT_TemplateEntry *ie = &tmpl[index];
101 : struct GNUNET_JSON_Specification spec[] = {
102 2 : GNUNET_JSON_spec_string ("template_id",
103 : &ie->template_id),
104 2 : GNUNET_JSON_spec_end ()
105 : };
106 :
107 2 : if (GNUNET_OK !=
108 2 : GNUNET_JSON_parse (value,
109 : spec,
110 : NULL, NULL))
111 : {
112 0 : GNUNET_break_op (0);
113 0 : return GNUNET_SYSERR;
114 : }
115 : }
116 4 : tgr->details.ok.templates_length = tmpl_len;
117 4 : tgr->details.ok.templates = tmpl;
118 4 : tgh->cb (tgh->cb_cls,
119 : tgr);
120 4 : tgh->cb = NULL; /* just to be sure */
121 : }
122 4 : return GNUNET_OK;
123 : }
124 :
125 :
126 : /**
127 : * Function called when we're done processing the
128 : * HTTP /templates request.
129 : *
130 : * @param cls the `struct TALER_MERCHANT_TemplatesGetHandle`
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 4 : handle_get_templates_finished (void *cls,
136 : long response_code,
137 : const void *response)
138 : {
139 4 : struct TALER_MERCHANT_TemplatesGetHandle *tgh = cls;
140 4 : const json_t *json = response;
141 4 : struct TALER_MERCHANT_TemplatesGetResponse tgr = {
142 4 : .hr.http_status = (unsigned int) response_code,
143 : .hr.reply = json
144 : };
145 :
146 4 : tgh->job = NULL;
147 4 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
148 : "Got /templates response with status code %u\n",
149 : (unsigned int) response_code);
150 4 : switch (response_code)
151 : {
152 4 : case MHD_HTTP_OK:
153 : {
154 : const json_t *templates;
155 : struct GNUNET_JSON_Specification spec[] = {
156 4 : GNUNET_JSON_spec_array_const ("templates",
157 : &templates),
158 4 : GNUNET_JSON_spec_end ()
159 : };
160 :
161 4 : if (GNUNET_OK !=
162 4 : 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 4 : if (GNUNET_OK ==
171 4 : parse_templates (templates,
172 : &tgr,
173 : tgh))
174 : {
175 4 : TALER_MERCHANT_templates_get_cancel (tgh);
176 4 : 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_templates_get_cancel (tgh);
200 : }
201 :
202 :
203 : struct TALER_MERCHANT_TemplatesGetHandle *
204 4 : TALER_MERCHANT_templates_get (
205 : struct GNUNET_CURL_Context *ctx,
206 : const char *backend_url,
207 : TALER_MERCHANT_TemplatesGetCallback cb,
208 : void *cb_cls)
209 : {
210 : struct TALER_MERCHANT_TemplatesGetHandle *tgh;
211 : CURL *eh;
212 :
213 4 : tgh = GNUNET_new (struct TALER_MERCHANT_TemplatesGetHandle);
214 4 : tgh->ctx = ctx;
215 4 : tgh->cb = cb;
216 4 : tgh->cb_cls = cb_cls;
217 4 : tgh->url = TALER_url_join (backend_url,
218 : "private/templates",
219 : NULL);
220 4 : 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 4 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
228 : "Requesting URL '%s'\n",
229 : tgh->url);
230 4 : eh = TALER_MERCHANT_curl_easy_get_ (tgh->url);
231 4 : tgh->job = GNUNET_CURL_job_add (ctx,
232 : eh,
233 : &handle_get_templates_finished,
234 : tgh);
235 4 : return tgh;
236 : }
237 :
238 :
239 : void
240 4 : TALER_MERCHANT_templates_get_cancel (
241 : struct TALER_MERCHANT_TemplatesGetHandle *tgh)
242 : {
243 4 : if (NULL != tgh->job)
244 0 : GNUNET_CURL_job_cancel (tgh->job);
245 4 : GNUNET_free (tgh->url);
246 4 : GNUNET_free (tgh);
247 4 : }
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