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_patch_webhook.c
21 : * @brief Implementation of the PATCH /webhooks/$ID request
22 : * of the merchant's HTTP API
23 : * @author Priscilla HUANG
24 : */
25 : #include "platform.h"
26 : #include <curl/curl.h>
27 : #include <jansson.h>
28 : #include <microhttpd.h> /* just for HTTP status codes */
29 : #include <gnunet/gnunet_util_lib.h>
30 : #include "taler_merchant_service.h"
31 : #include "merchant_api_curl_defaults.h"
32 : #include "merchant_api_common.h"
33 : #include <taler/taler_json_lib.h>
34 : #include <taler/taler_curl_lib.h>
35 :
36 :
37 : /**
38 : * Handle for a PATCH /webhooks/$ID operation.
39 : */
40 : struct TALER_MERCHANT_WebhookPatchHandle
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_WebhookPatchCallback 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 PATCH /webhooks/$ID request.
79 : *
80 : * @param cls the `struct TALER_MERCHANT_WebhookPatchHandle`
81 : * @param response_code HTTP response code, 0 on error
82 : * @param response response body, NULL if not in JSON
83 : */
84 : static void
85 4 : handle_patch_webhook_finished (void *cls,
86 : long response_code,
87 : const void *response)
88 : {
89 4 : struct TALER_MERCHANT_WebhookPatchHandle *wph = cls;
90 4 : const json_t *json = response;
91 4 : struct TALER_MERCHANT_HttpResponse hr = {
92 4 : .http_status = (unsigned int) response_code,
93 : .reply = json
94 : };
95 :
96 4 : wph->job = NULL;
97 4 : GNUNET_log (GNUNET_ERROR_TYPE_INFO,
98 : "PATCH /webhooks/$ID completed with response code %u\n",
99 : (unsigned int) response_code);
100 4 : switch (response_code)
101 : {
102 0 : case 0:
103 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
104 0 : break;
105 2 : case MHD_HTTP_NO_CONTENT:
106 2 : 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 0 : GNUNET_break_op (0);
111 : /* This should never happen, either us
112 : * or the merchant is buggy (or API version conflict);
113 : * just pass JSON reply to the application */
114 0 : break;
115 0 : case MHD_HTTP_UNAUTHORIZED:
116 0 : hr.ec = TALER_JSON_get_error_code (json);
117 0 : hr.hint = TALER_JSON_get_error_hint (json);
118 : /* Nothing really to verify, merchant says we need to authenticate. */
119 0 : break;
120 0 : case MHD_HTTP_FORBIDDEN:
121 0 : hr.ec = TALER_JSON_get_error_code (json);
122 0 : hr.hint = TALER_JSON_get_error_hint (json);
123 : /* Nothing really to verify, merchant says we tried to abort the payment
124 : * after it was successful. We should pass the JSON reply to the
125 : * application */
126 0 : break;
127 2 : case MHD_HTTP_NOT_FOUND:
128 2 : hr.ec = TALER_JSON_get_error_code (json);
129 2 : hr.hint = TALER_JSON_get_error_hint (json);
130 2 : break;
131 0 : case MHD_HTTP_CONFLICT:
132 0 : hr.ec = TALER_JSON_get_error_code (json);
133 0 : hr.hint = TALER_JSON_get_error_hint (json);
134 0 : break;
135 0 : case MHD_HTTP_INTERNAL_SERVER_ERROR:
136 0 : hr.ec = TALER_JSON_get_error_code (json);
137 0 : hr.hint = TALER_JSON_get_error_hint (json);
138 : /* Server had an internal issue; we should retry,
139 : but this API leaves this to the application */
140 0 : break;
141 0 : default:
142 0 : TALER_MERCHANT_parse_error_details_ (json,
143 : response_code,
144 : &hr);
145 : /* unexpected response code */
146 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
147 : "Unexpected response code %u/%d\n",
148 : (unsigned int) response_code,
149 : (int) hr.ec);
150 0 : GNUNET_break_op (0);
151 0 : break;
152 : }
153 4 : wph->cb (wph->cb_cls,
154 : &hr);
155 4 : TALER_MERCHANT_webhook_patch_cancel (wph);
156 4 : }
157 :
158 :
159 : struct TALER_MERCHANT_WebhookPatchHandle *
160 4 : TALER_MERCHANT_webhook_patch (
161 : struct GNUNET_CURL_Context *ctx,
162 : const char *backend_url,
163 : const char *webhook_id,
164 : const char *event_type,
165 : const char *url,
166 : const char *http_method,
167 : const char *header_template,
168 : const char *body_template,
169 : TALER_MERCHANT_WebhookPatchCallback cb,
170 : void *cb_cls)
171 : {
172 : struct TALER_MERCHANT_WebhookPatchHandle *wph;
173 : json_t *req_obj;
174 :
175 4 : req_obj = GNUNET_JSON_PACK (
176 : GNUNET_JSON_pack_string ("event_type",
177 : event_type),
178 : GNUNET_JSON_pack_string ("url",
179 : url),
180 : GNUNET_JSON_pack_string ("http_method",
181 : http_method),
182 : GNUNET_JSON_pack_string ("header_template",
183 : header_template),
184 : GNUNET_JSON_pack_string ("body_template",
185 : body_template));
186 4 : wph = GNUNET_new (struct TALER_MERCHANT_WebhookPatchHandle);
187 4 : wph->ctx = ctx;
188 4 : wph->cb = cb;
189 4 : wph->cb_cls = cb_cls;
190 : {
191 : char *path;
192 :
193 4 : GNUNET_asprintf (&path,
194 : "private/webhooks/%s",
195 : webhook_id);
196 4 : wph->url = TALER_url_join (backend_url,
197 : path,
198 : NULL);
199 4 : GNUNET_free (path);
200 : }
201 4 : if (NULL == wph->url)
202 : {
203 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
204 : "Could not construct request URL.\n");
205 0 : json_decref (req_obj);
206 0 : GNUNET_free (wph);
207 0 : return NULL;
208 : }
209 : {
210 : CURL *eh;
211 :
212 4 : eh = TALER_MERCHANT_curl_easy_get_ (wph->url);
213 4 : if (GNUNET_OK !=
214 4 : TALER_curl_easy_post (&wph->post_ctx,
215 : eh,
216 : req_obj))
217 : {
218 0 : GNUNET_break (0);
219 0 : curl_easy_cleanup (eh);
220 0 : json_decref (req_obj);
221 0 : GNUNET_free (wph);
222 0 : return NULL;
223 : }
224 4 : json_decref (req_obj);
225 4 : GNUNET_assert (CURLE_OK ==
226 : curl_easy_setopt (eh,
227 : CURLOPT_CUSTOMREQUEST,
228 : MHD_HTTP_METHOD_PATCH));
229 8 : wph->job = GNUNET_CURL_job_add2 (ctx,
230 : eh,
231 4 : wph->post_ctx.headers,
232 : &handle_patch_webhook_finished,
233 : wph);
234 : }
235 4 : return wph;
236 : }
237 :
238 :
239 : void
240 4 : TALER_MERCHANT_webhook_patch_cancel (
241 : struct TALER_MERCHANT_WebhookPatchHandle *wph)
242 : {
243 4 : if (NULL != wph->job)
244 : {
245 0 : GNUNET_CURL_job_cancel (wph->job);
246 0 : wph->job = NULL;
247 : }
248 4 : TALER_curl_easy_post_finished (&wph->post_ctx);
249 4 : GNUNET_free (wph->url);
250 4 : GNUNET_free (wph);
251 4 : }
252 :
253 :
254 : /* end of merchant_api_patch_webhook.c */
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