Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2025-2026 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-products-IMAGE_HASH-image-new.c
19 : * @brief Implementation of the GET /products/$IMAGE_HASH/image request
20 : * @author Christian Grothoff
21 : */
22 : #include "taler/platform.h"
23 : #include <curl/curl.h>
24 : #include <jansson.h>
25 : #include <microhttpd.h> /* just for HTTP status codes */
26 : #include <gnunet/gnunet_util_lib.h>
27 : #include <gnunet/gnunet_curl_lib.h>
28 : #include <taler/merchant/get-products-IMAGE_HASH-image.h>
29 : #include "merchant_api_curl_defaults.h"
30 : #include <taler/taler_json_lib.h>
31 :
32 :
33 : /**
34 : * Handle for a GET /products/$IMAGE_HASH/image operation.
35 : */
36 : struct TALER_MERCHANT_GetProductsImageHandle
37 : {
38 : /**
39 : * Base URL of the merchant backend.
40 : */
41 : char *base_url;
42 :
43 : /**
44 : * The full 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_GetProductsImageCallback cb;
57 :
58 : /**
59 : * Closure for @a cb.
60 : */
61 : TALER_MERCHANT_GET_PRODUCTS_IMAGE_RESULT_CLOSURE *cb_cls;
62 :
63 : /**
64 : * Reference to the execution context.
65 : */
66 : struct GNUNET_CURL_Context *ctx;
67 :
68 : /**
69 : * Image hash identifier.
70 : */
71 : char *image_hash;
72 : };
73 :
74 :
75 : /**
76 : * Function called when we're done processing the
77 : * HTTP GET /products/$IMAGE_HASH/image request.
78 : *
79 : * @param cls the `struct TALER_MERCHANT_GetProductsImageHandle`
80 : * @param response_code HTTP response code, 0 on error
81 : * @param response response body, NULL if not in JSON
82 : */
83 : static void
84 0 : handle_get_product_image_finished (void *cls,
85 : long response_code,
86 : const void *response)
87 : {
88 0 : struct TALER_MERCHANT_GetProductsImageHandle *gpi = cls;
89 0 : const json_t *json = response;
90 0 : struct TALER_MERCHANT_GetProductsImageResponse pgr = {
91 0 : .hr.http_status = (unsigned int) response_code,
92 : .hr.reply = json
93 : };
94 :
95 0 : gpi->job = NULL;
96 0 : GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
97 : "Got /products/$IMAGE_HASH/image response with status code %u\n",
98 : (unsigned int) response_code);
99 0 : switch (response_code)
100 : {
101 0 : case MHD_HTTP_OK:
102 : {
103 : struct GNUNET_JSON_Specification spec[] = {
104 0 : GNUNET_JSON_spec_string ("image",
105 : &pgr.details.ok.image),
106 0 : GNUNET_JSON_spec_end ()
107 : };
108 :
109 0 : if (GNUNET_OK ==
110 0 : GNUNET_JSON_parse (json,
111 : spec,
112 : NULL, NULL))
113 : {
114 0 : gpi->cb (gpi->cb_cls,
115 : &pgr);
116 0 : GNUNET_JSON_parse_free (spec);
117 0 : TALER_MERCHANT_get_products_image_cancel (gpi);
118 0 : return;
119 : }
120 0 : pgr.hr.http_status = 0;
121 0 : pgr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
122 0 : break;
123 : }
124 0 : case MHD_HTTP_NOT_FOUND:
125 : case MHD_HTTP_BAD_REQUEST:
126 0 : pgr.hr.ec = TALER_JSON_get_error_code (json);
127 0 : pgr.hr.hint = TALER_JSON_get_error_hint (json);
128 0 : break;
129 0 : default:
130 0 : pgr.hr.ec = TALER_JSON_get_error_code (json);
131 0 : pgr.hr.hint = TALER_JSON_get_error_hint (json);
132 0 : GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
133 : "Unexpected response code %u/%d\n",
134 : (unsigned int) response_code,
135 : (int) pgr.hr.ec);
136 0 : break;
137 : }
138 0 : gpi->cb (gpi->cb_cls,
139 : &pgr);
140 0 : TALER_MERCHANT_get_products_image_cancel (gpi);
141 : }
142 :
143 :
144 : struct TALER_MERCHANT_GetProductsImageHandle *
145 0 : TALER_MERCHANT_get_products_image_create (
146 : struct GNUNET_CURL_Context *ctx,
147 : const char *url,
148 : const char *image_hash)
149 : {
150 : struct TALER_MERCHANT_GetProductsImageHandle *gpi;
151 :
152 0 : gpi = GNUNET_new (struct TALER_MERCHANT_GetProductsImageHandle);
153 0 : gpi->ctx = ctx;
154 0 : gpi->base_url = GNUNET_strdup (url);
155 0 : gpi->image_hash = GNUNET_strdup (image_hash);
156 0 : return gpi;
157 : }
158 :
159 :
160 : enum TALER_ErrorCode
161 0 : TALER_MERCHANT_get_products_image_start (
162 : struct TALER_MERCHANT_GetProductsImageHandle *gpi,
163 : TALER_MERCHANT_GetProductsImageCallback cb,
164 : TALER_MERCHANT_GET_PRODUCTS_IMAGE_RESULT_CLOSURE *cb_cls)
165 : {
166 : CURL *eh;
167 :
168 0 : gpi->cb = cb;
169 0 : gpi->cb_cls = cb_cls;
170 : {
171 : char *path;
172 :
173 0 : GNUNET_asprintf (&path,
174 : "products/%s/image",
175 : gpi->image_hash);
176 0 : gpi->url = TALER_url_join (gpi->base_url,
177 : path,
178 : NULL);
179 0 : GNUNET_free (path);
180 : }
181 0 : if (NULL == gpi->url)
182 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
183 0 : eh = TALER_MERCHANT_curl_easy_get_ (gpi->url);
184 0 : if (NULL == eh)
185 0 : return TALER_EC_GENERIC_CONFIGURATION_INVALID;
186 0 : gpi->job = GNUNET_CURL_job_add (gpi->ctx,
187 : eh,
188 : &handle_get_product_image_finished,
189 : gpi);
190 0 : if (NULL == gpi->job)
191 0 : return TALER_EC_GENERIC_INTERNAL_INVARIANT_FAILURE;
192 0 : return TALER_EC_NONE;
193 : }
194 :
195 :
196 : void
197 0 : TALER_MERCHANT_get_products_image_cancel (
198 : struct TALER_MERCHANT_GetProductsImageHandle *gpi)
199 : {
200 0 : if (NULL != gpi->job)
201 : {
202 0 : GNUNET_CURL_job_cancel (gpi->job);
203 0 : gpi->job = NULL;
204 : }
205 0 : GNUNET_free (gpi->url);
206 0 : GNUNET_free (gpi->base_url);
207 0 : GNUNET_free (gpi->image_hash);
208 0 : GNUNET_free (gpi);
209 0 : }
210 :
211 :
212 : /* end of merchant_api_get-products-IMAGE_HASH-image-new.c */
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