Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2025 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_product_image.c
19 : * @brief Implementation of the GET /products/$HASH/image request
20 : * @author Bohdan Potuzhnyi
21 : */
22 : #include "platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h>
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include <taler/taler_error_codes.h>
29 : #include <taler/taler_json_lib.h>
30 : #include "taler_merchant_service.h"
31 : #include "merchant_api_curl_defaults.h"
32 :
33 :
34 : /**
35 : * Handle for a GET /products/$HASH/image operation.
36 : */
37 : struct TALER_MERCHANT_ProductImageGetHandle
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_ProductImageGetCallback 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 : * Function called when we're done processing the
68 : * HTTP GET /products/$HASH/image request.
69 : *
70 : * @param cls the `struct TALER_MERCHANT_ProductImageGetHandle`
71 : * @param response_code HTTP response code, 0 on error
72 : * @param response response body, NULL if not in JSON
73 : */
74 : static void
75 8 : handle_get_product_image_finished (void *cls,
76 : long response_code,
77 : const void *response)
78 : {
79 8 : struct TALER_MERCHANT_ProductImageGetHandle *pigh = cls;
80 8 : const json_t *json = response;
81 8 : struct TALER_MERCHANT_ProductImageGetResponse pir = {
82 8 : .hr.http_status = (unsigned int) response_code,
83 : .hr.reply = json
84 : };
85 :
86 8 : pigh->job = NULL;
87 8 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
88 : "Got /products/$HASH/image response with status code %u\n",
89 : (unsigned int) response_code);
90 8 : switch (response_code)
91 : {
92 2 : case MHD_HTTP_OK:
93 : {
94 : struct GNUNET_JSON_Specification spec[] = {
95 2 : GNUNET_JSON_spec_string ("image",
96 : &pir.details.ok.image),
97 2 : GNUNET_JSON_spec_end ()
98 : };
99 :
100 2 : if (GNUNET_OK ==
101 2 : GNUNET_JSON_parse (json,
102 : spec,
103 : NULL, NULL))
104 : {
105 2 : pigh->cb (pigh->cb_cls,
106 : &pir);
107 2 : GNUNET_JSON_parse_free (spec);
108 2 : TALER_MERCHANT_product_image_get_cancel (pigh);
109 2 : return;
110 : }
111 0 : pir.hr.http_status = 0;
112 0 : pir.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
113 0 : break;
114 : }
115 6 : case MHD_HTTP_NOT_FOUND:
116 : case MHD_HTTP_BAD_REQUEST:
117 6 : pir.hr.ec = TALER_JSON_get_error_code (json);
118 6 : pir.hr.hint = TALER_JSON_get_error_hint (json);
119 6 : break;
120 0 : default:
121 0 : pir.hr.ec = TALER_JSON_get_error_code (json);
122 0 : pir.hr.hint = TALER_JSON_get_error_hint (json);
123 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
124 : "Unexpected response code %u/%d\n",
125 : (unsigned int) response_code,
126 : (int) pir.hr.ec);
127 0 : break;
128 : }
129 6 : pigh->cb (pigh->cb_cls,
130 : &pir);
131 6 : TALER_MERCHANT_product_image_get_cancel (pigh);
132 : }
133 :
134 :
135 : struct TALER_MERCHANT_ProductImageGetHandle *
136 8 : TALER_MERCHANT_product_image_get (
137 : struct GNUNET_CURL_Context *ctx,
138 : const char *backend_url,
139 : const char *image_hash,
140 : TALER_MERCHANT_ProductImageGetCallback cb,
141 : void *cb_cls)
142 : {
143 : struct TALER_MERCHANT_ProductImageGetHandle *pigh;
144 : CURL *eh;
145 :
146 8 : pigh = GNUNET_new (struct TALER_MERCHANT_ProductImageGetHandle);
147 8 : pigh->ctx = ctx;
148 8 : pigh->cb = cb;
149 8 : pigh->cb_cls = cb_cls;
150 : {
151 : char *path;
152 :
153 8 : GNUNET_asprintf (&path,
154 : "products/%s/image",
155 : image_hash);
156 8 : pigh->url = TALER_url_join (backend_url,
157 : path,
158 : NULL);
159 8 : GNUNET_free (path);
160 : }
161 8 : if (NULL == pigh->url)
162 : {
163 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
164 : "Could not construct request URL.\n");
165 0 : GNUNET_free (pigh);
166 0 : return NULL;
167 : }
168 8 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
169 : "Requesting URL '%s'\n",
170 : pigh->url);
171 8 : eh = TALER_MERCHANT_curl_easy_get_ (pigh->url);
172 8 : pigh->job = GNUNET_CURL_job_add (ctx,
173 : eh,
174 : &handle_get_product_image_finished,
175 : pigh);
176 8 : return pigh;
177 : }
178 :
179 :
180 : void
181 8 : TALER_MERCHANT_product_image_get_cancel (
182 : struct TALER_MERCHANT_ProductImageGetHandle *pigh)
183 : {
184 8 : if (NULL != pigh->job)
185 0 : GNUNET_CURL_job_cancel (pigh->job);
186 8 : GNUNET_free (pigh->url);
187 8 : GNUNET_free (pigh);
188 8 : }
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