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Diffstat (limited to 'src/restclient/anastasis_api_config.c')
-rw-r--r--src/restclient/anastasis_api_config.c317
1 files changed, 317 insertions, 0 deletions
diff --git a/src/restclient/anastasis_api_config.c b/src/restclient/anastasis_api_config.c
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index 0000000..cf0846b
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+++ b/src/restclient/anastasis_api_config.c
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+/*
+ This file is part of Anastasis
+ Copyright (C) 2020, 2021 Taler Systems SA
+
+ Anastasis is free software; you can redistribute it and/or modify it under the
+ terms of the GNU Lesser General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/anastasis_api_config.c
+ * @brief Implementation of the /config GET
+ * @author Christian Grothoff
+ * @author Dennis Neufeld
+ * @author Dominik Meister
+ */
+#include "platform.h"
+#include <curl/curl.h>
+#include <microhttpd.h> /* just for HTTP status codes */
+#include "anastasis_service.h"
+#include "anastasis_api_curl_defaults.h"
+#include <gnunet/gnunet_json_lib.h>
+#include <taler/taler_json_lib.h>
+
+
+/**
+ * Which version of the Taler protocol is implemented
+ * by this library? Used to determine compatibility.
+ */
+#define ANASTASIS_PROTOCOL_CURRENT 0
+
+/**
+ * How many versions are we backwards compatible with?
+ */
+#define ANASTASIS_PROTOCOL_AGE 0
+
+
+struct ANASTASIS_ConfigOperation
+{
+ /**
+ * The url for this request.
+ */
+ char *url;
+
+ /**
+ * Handle for the request.
+ */
+ struct GNUNET_CURL_Job *job;
+
+ /**
+ * Reference to the execution context.
+ */
+ struct GNUNET_CURL_Context *ctx;
+
+ /**
+ * The callback to pass the backend response to
+ */
+ ANASTASIS_ConfigCallback cb;
+
+ /**
+ * Closure for @a cb.
+ */
+ void *cb_cls;
+
+};
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /config request.
+ *
+ * @param cls the `struct ANASTASIS_ConfigOperation`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_config_finished (void *cls,
+ long response_code,
+ const void *response)
+{
+ struct ANASTASIS_ConfigOperation *co = cls;
+ const json_t *json = response;
+
+ co->job = NULL;
+ switch (response_code)
+ {
+ case 0:
+ /* Hard error */
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Backend `%s' failed to respond to GET /config\n",
+ co->url);
+ break;
+ case MHD_HTTP_OK:
+ {
+ const char *name;
+ struct ANASTASIS_Config acfg;
+ json_t *methods;
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_string ("name",
+ &name),
+ GNUNET_JSON_spec_string ("business_name",
+ &acfg.business_name),
+ GNUNET_JSON_spec_string ("version",
+ &acfg.version),
+ GNUNET_JSON_spec_string ("currency",
+ &acfg.currency),
+ GNUNET_JSON_spec_json ("methods",
+ &methods),
+ GNUNET_JSON_spec_uint32 ("storage_limit_in_megabytes",
+ &acfg.storage_limit_in_megabytes),
+ TALER_JSON_spec_amount_any ("annual_fee",
+ &acfg.annual_fee),
+ TALER_JSON_spec_amount_any ("truth_upload_fee",
+ &acfg.truth_upload_fee),
+ TALER_JSON_spec_amount_any ("liability_limit",
+ &acfg.liability_limit),
+ GNUNET_JSON_spec_fixed_auto ("server_salt",
+ &acfg.salt),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_JSON_parse (json,
+ spec,
+ NULL, NULL))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ break;
+ }
+ if (0 != strcmp (name,
+ "anastasis"))
+ {
+ GNUNET_JSON_parse_free (spec);
+ response_code = 0;
+ break;
+ }
+ {
+ unsigned int age;
+ unsigned int revision;
+ unsigned int current;
+ char dummy;
+
+ if (3 != sscanf (acfg.version,
+ "%u:%u:%u%c",
+ &current,
+ &revision,
+ &age,
+ &dummy))
+ {
+ GNUNET_break_op (0);
+ response_code = 0;
+ GNUNET_JSON_parse_free (spec);
+ break;
+ }
+ if ( (ANASTASIS_PROTOCOL_CURRENT < current) &&
+ (ANASTASIS_PROTOCOL_CURRENT < current - age) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Provider protocol version too new\n");
+ response_code = 0;
+ GNUNET_JSON_parse_free (spec);
+ break;
+ }
+ if ( (ANASTASIS_PROTOCOL_CURRENT > current) &&
+ (ANASTASIS_PROTOCOL_CURRENT - ANASTASIS_PROTOCOL_AGE > current) )
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Provider protocol version too old\n");
+ GNUNET_break_op (0);
+ response_code = 0;
+ GNUNET_JSON_parse_free (spec);
+ break;
+ }
+ }
+ if ( (GNUNET_OK !=
+ TALER_amount_cmp_currency (&acfg.liability_limit,
+ &acfg.annual_fee)) ||
+ (0 !=
+ strcasecmp (acfg.currency,
+ acfg.annual_fee.currency)) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ response_code = 0;
+ break;
+ }
+
+ if (! json_is_array (methods))
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ response_code = 0;
+ break;
+ }
+ acfg.methods_length = json_array_size (methods);
+ {
+ struct ANASTASIS_AuthorizationMethodConfig mcfg[GNUNET_NZL (
+ acfg.methods_length)];
+
+ for (unsigned int i = 0; i<acfg.methods_length; i++)
+ {
+ struct ANASTASIS_AuthorizationMethodConfig *m = &mcfg[i];
+ struct GNUNET_JSON_Specification spec[] = {
+ GNUNET_JSON_spec_string ("type",
+ &m->type),
+ TALER_JSON_spec_amount_any ("cost",
+ &m->usage_fee),
+ GNUNET_JSON_spec_end ()
+ };
+
+ if ( (GNUNET_OK !=
+ GNUNET_JSON_parse (json_array_get (methods,
+ i),
+ spec,
+ NULL, NULL)) ||
+ (0 !=
+ strcasecmp (m->usage_fee.currency,
+ acfg.currency)) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_JSON_parse_free (spec);
+ response_code = 0;
+ goto end;
+ }
+ }
+ acfg.methods = mcfg;
+ co->cb (co->cb_cls,
+ MHD_HTTP_OK,
+ &acfg);
+ GNUNET_JSON_parse_free (spec);
+ ANASTASIS_config_cancel (co);
+ return;
+ }
+ }
+ case MHD_HTTP_BAD_REQUEST:
+ /* This should never happen, either us or the anastasis server is buggy
+ (or API version conflict); just pass JSON reply to the application */
+ break;
+ case MHD_HTTP_NOT_FOUND:
+ /* Nothing really to verify */
+ break;
+ case MHD_HTTP_INTERNAL_SERVER_ERROR:
+ /* Server had an internal issue; we should retry, but this API
+ leaves this to the application */
+ break;
+ default:
+ /* unexpected response code */
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Unexpected response code %u\n",
+ (unsigned int) response_code);
+ GNUNET_break_op (0);
+ break;
+ }
+end:
+ co->cb (co->cb_cls,
+ response_code,
+ NULL);
+ ANASTASIS_config_cancel (co);
+}
+
+
+struct ANASTASIS_ConfigOperation *
+ANASTASIS_get_config (struct GNUNET_CURL_Context *ctx,
+ const char *base_url,
+ ANASTASIS_ConfigCallback cb,
+ void *cb_cls)
+{
+ struct ANASTASIS_ConfigOperation *co;
+
+ co = GNUNET_new (struct ANASTASIS_ConfigOperation);
+ co->url = TALER_url_join (base_url,
+ "config",
+ NULL);
+ co->ctx = ctx;
+ co->cb = cb;
+ co->cb_cls = cb_cls;
+ {
+ CURL *eh;
+
+ eh = ANASTASIS_curl_easy_get_ (co->url);
+ co->job = GNUNET_CURL_job_add2 (ctx,
+ eh,
+ GNUNET_NO,
+ &handle_config_finished,
+ co);
+ }
+ if (NULL == co->job)
+ {
+ GNUNET_free (co->url);
+ GNUNET_free (co);
+ return NULL;
+ }
+ return co;
+}
+
+
+void
+ANASTASIS_config_cancel (struct ANASTASIS_ConfigOperation *co)
+{
+ if (NULL != co->job)
+ {
+ GNUNET_CURL_job_cancel (co->job);
+ co->job = NULL;
+ }
+ GNUNET_free (co->url);
+ GNUNET_free (co);
+}
+
+
+/* end of anastasis_api_config.c */