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
6 : it under the terms of the GNU Lesser 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 : TALER is distributed in the hope that it will be useful,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 : GNU Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General
16 : Public License along with TALER; see the file COPYING.LGPL.
17 : If not, see <http://www.gnu.org/licenses/>
18 : */
19 : /**
20 : * @file merchant_api_post_webhooks.c
21 : * @brief Implementation of the POST /webhooks request
22 : * of the merchant's HTTP API
23 : * @author Priscilla HUANG
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 <gnunet/gnunet_util_lib.h>
30 : #include "taler_merchant_service.h"
31 : #include "merchant_api_curl_defaults.h"
32 : #include "merchant_api_common.h"
33 : #include <taler/taler_json_lib.h>
34 : #include <taler/taler_curl_lib.h>
35 :
36 :
37 : /**
38 : * Handle for a POST /webhooks/$ID operation.
39 : */
40 : struct TALER_MERCHANT_WebhooksPostHandle
41 : {
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_WebhooksPostCallback 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 : * Minor context that holds body and headers.
70 : */
71 : struct TALER_CURL_PostContext post_ctx;
72 :
73 : };
74 :
75 :
76 : /**
77 : * Function called when we're done processing the
78 : * HTTP POST /webhooks request.
79 : *
80 : * @param cls the `struct TALER_MERCHANT_WebhooksPostHandle`
81 : * @param response_code HTTP response code, 0 on error
82 : * @param response response body, NULL if not in JSON
83 : */
84 : static void
85 10 : handle_post_webhooks_finished (void *cls,
86 : long response_code,
87 : const void *response)
88 : {
89 10 : struct TALER_MERCHANT_WebhooksPostHandle *wph = cls;
90 10 : const json_t *json = response;
91 10 : struct TALER_MERCHANT_HttpResponse hr = {
92 10 : .http_status = (unsigned int) response_code,
93 : .reply = json
94 : };
95 :
96 10 : wph->job = NULL;
97 10 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
98 : "POST /webhooks completed with response code %u\n",
99 : (unsigned int) response_code);
100 10 : switch (response_code)
101 : {
102 0 : case 0:
103 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
104 0 : break;
105 8 : case MHD_HTTP_NO_CONTENT:
106 8 : break;
107 0 : case MHD_HTTP_BAD_REQUEST:
108 0 : hr.ec = TALER_JSON_get_error_code (json);
109 0 : hr.hint = TALER_JSON_get_error_hint (json);
110 : /* This should never happen, either us
111 : * or the merchant is buggy (or API version conflict);
112 : * just pass JSON reply to the application */
113 0 : break;
114 0 : case MHD_HTTP_UNAUTHORIZED:
115 0 : hr.ec = TALER_JSON_get_error_code (json);
116 0 : hr.hint = TALER_JSON_get_error_hint (json);
117 : /* Nothing really to verify, merchant says we need to authenticate. */
118 0 : break;
119 0 : case MHD_HTTP_FORBIDDEN:
120 0 : hr.ec = TALER_JSON_get_error_code (json);
121 0 : hr.hint = TALER_JSON_get_error_hint (json);
122 : /* Nothing really to verify, merchant says we tried to abort the payment
123 : * after it was successful. We should pass the JSON reply to the
124 : * application */
125 0 : break;
126 0 : case MHD_HTTP_NOT_FOUND:
127 0 : hr.ec = TALER_JSON_get_error_code (json);
128 0 : hr.hint = TALER_JSON_get_error_hint (json);
129 : /* Nothing really to verify, this should never
130 : happen, we should pass the JSON reply to the
131 : application */
132 0 : break;
133 2 : case MHD_HTTP_CONFLICT:
134 2 : hr.ec = TALER_JSON_get_error_code (json);
135 2 : hr.hint = TALER_JSON_get_error_hint (json);
136 2 : break;
137 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
138 0 : hr.ec = TALER_JSON_get_error_code (json);
139 0 : hr.hint = TALER_JSON_get_error_hint (json);
140 : /* Server had an internal issue; we should retry,
141 : but this API leaves this to the application */
142 0 : break;
143 0 : default:
144 0 : TALER_MERCHANT_parse_error_details_ (json,
145 : response_code,
146 : &hr);
147 : /* unexpected response code */
148 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
149 : "Unexpected response code %u/%d\n",
150 : (unsigned int) response_code,
151 : (int) hr.ec);
152 0 : GNUNET_break_op (0);
153 0 : break;
154 : }
155 10 : wph->cb (wph->cb_cls,
156 : &hr);
157 10 : TALER_MERCHANT_webhooks_post_cancel (wph);
158 10 : }
159 :
160 :
161 : struct TALER_MERCHANT_WebhooksPostHandle *
162 10 : TALER_MERCHANT_webhooks_post (
163 : struct GNUNET_CURL_Context *ctx,
164 : const char *backend_url,
165 : const char *webhook_id,
166 : const char *event_type,
167 : const char *url,
168 : const char *http_method,
169 : const char *header_template,
170 : const char *body_template,
171 : TALER_MERCHANT_WebhooksPostCallback cb,
172 : void *cb_cls)
173 : {
174 : struct TALER_MERCHANT_WebhooksPostHandle *wph;
175 : json_t *req_obj;
176 :
177 10 : req_obj = GNUNET_JSON_PACK (
178 : GNUNET_JSON_pack_string ("webhook_id",
179 : webhook_id),
180 : GNUNET_JSON_pack_string ("event_type",
181 : event_type),
182 : GNUNET_JSON_pack_string ("url",
183 : url),
184 : GNUNET_JSON_pack_string ("http_method",
185 : http_method),
186 : GNUNET_JSON_pack_string ("header_template",
187 : header_template),
188 : GNUNET_JSON_pack_string ("body_template",
189 : body_template));
190 10 : wph = GNUNET_new (struct TALER_MERCHANT_WebhooksPostHandle);
191 10 : wph->ctx = ctx;
192 10 : wph->cb = cb;
193 10 : wph->cb_cls = cb_cls;
194 10 : wph->url = TALER_url_join (backend_url,
195 : "private/webhooks",
196 : NULL);
197 10 : if (NULL == wph->url)
198 : {
199 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
200 : "Could not construct request URL.\n");
201 0 : json_decref (req_obj);
202 0 : GNUNET_free (wph);
203 0 : return NULL;
204 : }
205 : {
206 : CURL *eh;
207 :
208 10 : eh = TALER_MERCHANT_curl_easy_get_ (wph->url);
209 10 : GNUNET_assert (GNUNET_OK ==
210 : TALER_curl_easy_post (&wph->post_ctx,
211 : eh,
212 : req_obj));
213 10 : json_decref (req_obj);
214 20 : wph->job = GNUNET_CURL_job_add2 (ctx,
215 : eh,
216 10 : wph->post_ctx.headers,
217 : &handle_post_webhooks_finished,
218 : wph);
219 10 : GNUNET_assert (NULL != wph->job);
220 : }
221 10 : return wph;
222 : }
223 :
224 :
225 : void
226 10 : TALER_MERCHANT_webhooks_post_cancel (
227 : struct TALER_MERCHANT_WebhooksPostHandle *wph)
228 : {
229 10 : if (NULL != wph->job)
230 : {
231 0 : GNUNET_CURL_job_cancel (wph->job);
232 0 : wph->job = NULL;
233 : }
234 10 : TALER_curl_easy_post_finished (&wph->post_ctx);
235 10 : GNUNET_free (wph->url);
236 10 : GNUNET_free (wph);
237 10 : }
238 :
239 :
240 : /* end of merchant_api_post_webhooks.c */
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