diff options
Diffstat (limited to 'src/restclient/anastasis_api_policy_meta_lookup.c')
-rw-r--r-- | src/restclient/anastasis_api_policy_meta_lookup.c | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/src/restclient/anastasis_api_policy_meta_lookup.c b/src/restclient/anastasis_api_policy_meta_lookup.c new file mode 100644 index 0000000..9be49ca --- /dev/null +++ b/src/restclient/anastasis_api_policy_meta_lookup.c | |||
@@ -0,0 +1,267 @@ | |||
1 | /* | ||
2 | This file is part of ANASTASIS | ||
3 | Copyright (C) 2022 Anastasis SARL | ||
4 | |||
5 | ANASTASIS is free software; you can redistribute it and/or modify | ||
6 | it under the terms of the GNU General Public License as | ||
7 | published by the Free Software Foundation; either version 2.1, | ||
8 | or (at your option) any later version. | ||
9 | |||
10 | ANASTASIS is distributed in the hope that it will be useful, but | ||
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | ||
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
13 | GNU General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public | ||
16 | License along with ANASTASIS; see the file COPYING.LGPL. If not, | ||
17 | see <http://www.gnu.org/licenses/> | ||
18 | */ | ||
19 | |||
20 | /** | ||
21 | * @file restclient/anastasis_api_policy_meta_lookup.c | ||
22 | * @brief Implementation of the /policy/$POL/meta GET request | ||
23 | * @author Christian Grothoff | ||
24 | */ | ||
25 | #include "platform.h" | ||
26 | #include <curl/curl.h> | ||
27 | #include <jansson.h> | ||
28 | #include <microhttpd.h> /* just for HTTP status codes */ | ||
29 | #include "anastasis_service.h" | ||
30 | #include "anastasis_api_curl_defaults.h" | ||
31 | #include <taler/taler_signatures.h> | ||
32 | |||
33 | |||
34 | /** | ||
35 | * @brief A Meta Operation Handle | ||
36 | */ | ||
37 | struct ANASTASIS_PolicyMetaLookupOperation | ||
38 | { | ||
39 | |||
40 | /** | ||
41 | * The url for this request, including parameters. | ||
42 | */ | ||
43 | char *url; | ||
44 | |||
45 | /** | ||
46 | * Handle for the request. | ||
47 | */ | ||
48 | struct GNUNET_CURL_Job *job; | ||
49 | |||
50 | /** | ||
51 | * Function to call with the result. | ||
52 | */ | ||
53 | ANASTASIS_PolicyMetaLookupCallback cb; | ||
54 | |||
55 | /** | ||
56 | * Closure for @a cb. | ||
57 | */ | ||
58 | void *cb_cls; | ||
59 | |||
60 | /** | ||
61 | * Reference to the execution context. | ||
62 | */ | ||
63 | struct GNUNET_CURL_Context *ctx; | ||
64 | |||
65 | /** | ||
66 | * Public key of the account we are downloading from. | ||
67 | */ | ||
68 | struct ANASTASIS_CRYPTO_AccountPublicKeyP account_pub; | ||
69 | |||
70 | /** | ||
71 | * Maximum version to fetch. | ||
72 | */ | ||
73 | uint32_t max_version; | ||
74 | |||
75 | }; | ||
76 | |||
77 | |||
78 | /** | ||
79 | * Process GET /policy/$POL/meta response | ||
80 | * | ||
81 | * @param cls our `struct ANASTASIS_PolicyMetaLookupOperation *` | ||
82 | * @param response_code HTTP status | ||
83 | * @param data response body, a `json_t *`, NULL on error | ||
84 | */ | ||
85 | static void | ||
86 | handle_policy_meta_lookup_finished (void *cls, | ||
87 | long response_code, | ||
88 | const void *response) | ||
89 | { | ||
90 | struct ANASTASIS_PolicyMetaLookupOperation *plo = cls; | ||
91 | const json_t *json = response; | ||
92 | |||
93 | plo->job = NULL; | ||
94 | switch (response_code) | ||
95 | { | ||
96 | case 0: | ||
97 | /* Hard error */ | ||
98 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
99 | "Backend didn't even return from GET /policy\n"); | ||
100 | break; | ||
101 | case MHD_HTTP_OK: | ||
102 | { | ||
103 | size_t mlen = json_object_size (json); | ||
104 | |||
105 | /* put a cap, as we will stack-allocate below and the | ||
106 | current service LIMITs the result to 1000 anyway; | ||
107 | could theoretically be increased in the future, but | ||
108 | then we should not put this onto the stack anymore... */ | ||
109 | if (mlen > 10000) | ||
110 | { | ||
111 | GNUNET_break (0); | ||
112 | response_code = 0; | ||
113 | break; | ||
114 | } | ||
115 | { | ||
116 | struct ANASTASIS_MetaDataEntry metas[GNUNET_NZL (mlen)]; | ||
117 | void *md[GNUNET_NZL (mlen)]; | ||
118 | struct ANASTASIS_MetaDownloadDetails mdd = { | ||
119 | .metas = metas, | ||
120 | .metas_length = mlen | ||
121 | }; | ||
122 | size_t off = 0; | ||
123 | const char *label; | ||
124 | const json_t *val; | ||
125 | |||
126 | memset (md, | ||
127 | 0, | ||
128 | sizeof (md)); | ||
129 | json_object_foreach ((json_t *) json, | ||
130 | label, | ||
131 | val) | ||
132 | { | ||
133 | unsigned int ver; | ||
134 | char dummy; | ||
135 | const char *vals; | ||
136 | |||
137 | if (1 != sscanf (label, | ||
138 | "%u%c", | ||
139 | &ver, | ||
140 | &dummy)) | ||
141 | { | ||
142 | GNUNET_break (0); | ||
143 | break; | ||
144 | } | ||
145 | metas[off].version = (uint32_t) ver; | ||
146 | if (json_is_null (val)) | ||
147 | { | ||
148 | metas[off].meta_data = NULL; | ||
149 | metas[off].meta_data_size = 0; | ||
150 | off++; | ||
151 | continue; | ||
152 | } | ||
153 | vals = json_string_value (val); | ||
154 | if ( (NULL == vals) || | ||
155 | (GNUNET_OK != | ||
156 | GNUNET_STRINGS_string_to_data_alloc (vals, | ||
157 | strlen (vals), | ||
158 | &md[off], | ||
159 | &metas[off].meta_data_size)) ) | ||
160 | { | ||
161 | GNUNET_break (0); | ||
162 | break; | ||
163 | } | ||
164 | metas[off].version = (uint32_t) ver; | ||
165 | metas[off].meta_data = md[off]; | ||
166 | off++; | ||
167 | } | ||
168 | if (off < mlen) | ||
169 | { | ||
170 | GNUNET_break (0); | ||
171 | response_code = 0; | ||
172 | for (size_t i = 0; i<off; i++) | ||
173 | GNUNET_free (md[i]); | ||
174 | break; | ||
175 | } | ||
176 | plo->cb (plo->cb_cls, | ||
177 | response_code, | ||
178 | &mdd); | ||
179 | for (size_t i = 0; i<off; i++) | ||
180 | GNUNET_free (md[i]); | ||
181 | plo->cb = NULL; | ||
182 | } | ||
183 | ANASTASIS_policy_meta_lookup_cancel (plo); | ||
184 | return; | ||
185 | } | ||
186 | case MHD_HTTP_BAD_REQUEST: | ||
187 | /* This should never happen, either us or the anastasis server is buggy | ||
188 | (or API version conflict); just pass JSON reply to the application */ | ||
189 | break; | ||
190 | case MHD_HTTP_NOT_FOUND: | ||
191 | /* Nothing really to verify */ | ||
192 | break; | ||
193 | case MHD_HTTP_INTERNAL_SERVER_ERROR: | ||
194 | /* Server had an internal issue; we should retry, but this API | ||
195 | leaves this to the application */ | ||
196 | break; | ||
197 | default: | ||
198 | /* unexpected response code */ | ||
199 | GNUNET_log (GNUNET_ERROR_TYPE_ERROR, | ||
200 | "Unexpected response code %u\n", | ||
201 | (unsigned int) response_code); | ||
202 | GNUNET_break (0); | ||
203 | response_code = 0; | ||
204 | break; | ||
205 | } | ||
206 | plo->cb (plo->cb_cls, | ||
207 | response_code, | ||
208 | NULL); | ||
209 | plo->cb = NULL; | ||
210 | ANASTASIS_policy_meta_lookup_cancel (plo); | ||
211 | } | ||
212 | |||
213 | |||
214 | struct ANASTASIS_PolicyMetaLookupOperation * | ||
215 | ANASTASIS_policy_meta_lookup ( | ||
216 | struct GNUNET_CURL_Context *ctx, | ||
217 | const char *backend_url, | ||
218 | const struct ANASTASIS_CRYPTO_AccountPublicKeyP *anastasis_pub, | ||
219 | uint32_t max_version, | ||
220 | ANASTASIS_PolicyMetaLookupCallback cb, | ||
221 | void *cb_cls) | ||
222 | { | ||
223 | struct ANASTASIS_PolicyMetaLookupOperation *plo; | ||
224 | CURL *eh; | ||
225 | char *path; | ||
226 | |||
227 | GNUNET_assert (NULL != cb); | ||
228 | plo = GNUNET_new (struct ANASTASIS_PolicyMetaLookupOperation); | ||
229 | plo->account_pub = *anastasis_pub; | ||
230 | { | ||
231 | char *acc_pub_str; | ||
232 | |||
233 | acc_pub_str = GNUNET_STRINGS_data_to_string_alloc (anastasis_pub, | ||
234 | sizeof (*anastasis_pub)); | ||
235 | GNUNET_asprintf (&path, | ||
236 | "policy/%s/meta", | ||
237 | acc_pub_str); | ||
238 | GNUNET_free (acc_pub_str); | ||
239 | } | ||
240 | plo->url = TALER_url_join (backend_url, | ||
241 | path, | ||
242 | NULL); | ||
243 | GNUNET_free (path); | ||
244 | eh = ANASTASIS_curl_easy_get_ (plo->url); | ||
245 | GNUNET_assert (NULL != eh); | ||
246 | plo->cb = cb; | ||
247 | plo->cb_cls = cb_cls; | ||
248 | plo->job = GNUNET_CURL_job_add (ctx, | ||
249 | eh, | ||
250 | &handle_policy_meta_lookup_finished, | ||
251 | plo); | ||
252 | return plo; | ||
253 | } | ||
254 | |||
255 | |||
256 | void | ||
257 | ANASTASIS_policy_meta_lookup_cancel (struct | ||
258 | ANASTASIS_PolicyMetaLookupOperation *plo) | ||
259 | { | ||
260 | if (NULL != plo->job) | ||
261 | { | ||
262 | GNUNET_CURL_job_cancel (plo->job); | ||
263 | plo->job = NULL; | ||
264 | } | ||
265 | GNUNET_free (plo->url); | ||
266 | GNUNET_free (plo); | ||
267 | } | ||