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_webhook.c
19 : * @brief Implementation of the GET /webhooks/$ID request of the merchant's HTTP API
20 : * @author Priscilla HUANG
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include "taler_merchant_service.h"
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 : #include <taler/taler_signatures.h>
32 :
33 :
34 : /**
35 : * Handle for a GET /webhooks/$ID operation.
36 : */
37 : struct TALER_MERCHANT_WebhookGetHandle
38 : {
39 : /**
40 : * The url for this request.
41 : */
42 : char *url;
43 :
44 : /**
45 : * Handle for the request.
46 : */
47 : struct GNUNET_CURL_Job *job;
48 :
49 : /**
50 : * Function to call with the result.
51 : */
52 : TALER_MERCHANT_WebhookGetCallback cb;
53 :
54 : /**
55 : * Closure for @a cb.
56 : */
57 : void *cb_cls;
58 :
59 : /**
60 : * Reference to the execution context.
61 : */
62 : struct GNUNET_CURL_Context *ctx;
63 :
64 : };
65 :
66 :
67 : /**
68 : * Function called when we're done processing the
69 : * HTTP GET /webhooks/$ID request.
70 : *
71 : * @param cls the `struct TALER_MERCHANT_WebhookGetHandle`
72 : * @param response_code HTTP response code, 0 on error
73 : * @param response response body, NULL if not in JSON
74 : */
75 : static void
76 6 : handle_get_webhook_finished (void *cls,
77 : long response_code,
78 : const void *response)
79 : {
80 6 : struct TALER_MERCHANT_WebhookGetHandle *wgh = cls;
81 6 : const json_t *json = response;
82 6 : struct TALER_MERCHANT_HttpResponse hr = {
83 6 : .http_status = (unsigned int) response_code,
84 : .reply = json
85 : };
86 :
87 6 : wgh->job = NULL;
88 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
89 : "Got /webhooks/$ID response with status code %u\n",
90 : (unsigned int) response_code);
91 6 : switch (response_code)
92 : {
93 4 : case MHD_HTTP_OK:
94 : {
95 : const char *event_type;
96 : const char *url;
97 : const char *http_method;
98 : const char *header_template;
99 : const char *body_template;
100 4 : bool rst_ok = true;
101 : struct GNUNET_JSON_Specification spec[] = {
102 4 : GNUNET_JSON_spec_string ("event_type",
103 : &event_type),
104 4 : TALER_JSON_spec_web_url ("url",
105 : &url),
106 4 : GNUNET_JSON_spec_string ("http_method",
107 : &http_method),
108 4 : GNUNET_JSON_spec_string ("header_template",
109 : &header_template),
110 4 : GNUNET_JSON_spec_string ("body_template",
111 : &body_template),
112 4 : GNUNET_JSON_spec_end ()
113 : };
114 :
115 :
116 8 : if ( (rst_ok) &&
117 : (GNUNET_OK ==
118 4 : GNUNET_JSON_parse (json,
119 : spec,
120 : NULL, NULL)) )
121 : {
122 4 : wgh->cb (wgh->cb_cls,
123 : &hr,
124 : event_type,
125 : url,
126 : http_method,
127 : header_template,
128 : body_template);
129 4 : GNUNET_JSON_parse_free (spec);
130 4 : TALER_MERCHANT_webhook_get_cancel (wgh);
131 4 : return;
132 : }
133 0 : hr.http_status = 0;
134 0 : hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
135 0 : GNUNET_JSON_parse_free (spec);
136 0 : break;
137 : }
138 0 : case MHD_HTTP_UNAUTHORIZED:
139 0 : hr.ec = TALER_JSON_get_error_code (json);
140 0 : hr.hint = TALER_JSON_get_error_hint (json);
141 : /* Nothing really to verify, merchant says we need to authenticate. */
142 0 : break;
143 2 : case MHD_HTTP_NOT_FOUND:
144 2 : hr.ec = TALER_JSON_get_error_code (json);
145 2 : hr.hint = TALER_JSON_get_error_hint (json);
146 2 : break;
147 0 : default:
148 : /* unexpected response code */
149 0 : hr.ec = TALER_JSON_get_error_code (json);
150 0 : hr.hint = TALER_JSON_get_error_hint (json);
151 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
152 : "Unexpected response code %u/%d\n",
153 : (unsigned int) response_code,
154 : (int) hr.ec);
155 0 : break;
156 : }
157 2 : wgh->cb (wgh->cb_cls,
158 : &hr,
159 : NULL,
160 : NULL,
161 : NULL,
162 : NULL,
163 : NULL);
164 2 : TALER_MERCHANT_webhook_get_cancel (wgh);
165 : }
166 :
167 :
168 : struct TALER_MERCHANT_WebhookGetHandle *
169 6 : TALER_MERCHANT_webhook_get (
170 : struct GNUNET_CURL_Context *ctx,
171 : const char *backend_url,
172 : const char *webhook_id,
173 : TALER_MERCHANT_WebhookGetCallback cb,
174 : void *cb_cls)
175 : {
176 : struct TALER_MERCHANT_WebhookGetHandle *wgh;
177 : CURL *eh;
178 :
179 6 : wgh = GNUNET_new (struct TALER_MERCHANT_WebhookGetHandle);
180 6 : wgh->ctx = ctx;
181 6 : wgh->cb = cb;
182 6 : wgh->cb_cls = cb_cls;
183 : {
184 : char *path;
185 :
186 6 : GNUNET_asprintf (&path,
187 : "private/webhooks/%s",
188 : webhook_id);
189 6 : wgh->url = TALER_url_join (backend_url,
190 : path,
191 : NULL);
192 6 : GNUNET_free (path);
193 : }
194 6 : if (NULL == wgh->url)
195 : {
196 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
197 : "Could not construct request URL.\n");
198 0 : GNUNET_free (wgh);
199 0 : return NULL;
200 : }
201 6 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
202 : "Requesting URL '%s'\n",
203 : wgh->url);
204 6 : eh = TALER_MERCHANT_curl_easy_get_ (wgh->url);
205 6 : wgh->job = GNUNET_CURL_job_add (ctx,
206 : eh,
207 : &handle_get_webhook_finished,
208 : wgh);
209 6 : return wgh;
210 : }
211 :
212 :
213 : void
214 6 : TALER_MERCHANT_webhook_get_cancel (
215 : struct TALER_MERCHANT_WebhookGetHandle *wgh)
216 : {
217 6 : if (NULL != wgh->job)
218 0 : GNUNET_CURL_job_cancel (wgh->job);
219 6 : GNUNET_free (wgh->url);
220 6 : GNUNET_free (wgh);
221 6 : }
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