diff options
Diffstat (limited to 'src/restclient/anastasis_api_policy_meta_lookup.c')
| -rw-r--r-- | src/restclient/anastasis_api_policy_meta_lookup.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/src/restclient/anastasis_api_policy_meta_lookup.c b/src/restclient/anastasis_api_policy_meta_lookup.c new file mode 100644 index 0000000..cf381fd --- /dev/null +++ b/src/restclient/anastasis_api_policy_meta_lookup.c @@ -0,0 +1,272 @@ +/* + This file is part of ANASTASIS + Copyright (C) 2022 Anastasis SARL + + ANASTASIS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2.1, + 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.LGPL. If not, + see <http://www.gnu.org/licenses/> +*/ + +/** + * @file restclient/anastasis_api_policy_meta_lookup.c + * @brief Implementation of the /policy/$POL/meta GET request + * @author Christian Grothoff + */ +#include "platform.h" +#include <curl/curl.h> +#include <jansson.h> +#include <microhttpd.h> /* just for HTTP status codes */ +#include "anastasis_service.h" +#include "anastasis_api_curl_defaults.h" +#include <gnunet/gnunet_json_lib.h> +#include <taler/taler_signatures.h> + + +/** + * @brief A Meta Operation Handle + */ +struct ANASTASIS_PolicyMetaLookupOperation +{ + + /** + * The url for this request, including parameters. + */ + char *url; + + /** + * Handle for the request. + */ + struct GNUNET_CURL_Job *job; + + /** + * Function to call with the result. + */ + ANASTASIS_PolicyMetaLookupCallback cb; + + /** + * Closure for @a cb. + */ + void *cb_cls; + + /** + * Reference to the execution context. + */ + struct GNUNET_CURL_Context *ctx; + + /** + * Public key of the account we are downloading from. + */ + struct ANASTASIS_CRYPTO_AccountPublicKeyP account_pub; + + /** + * Maximum version to fetch. + */ + uint32_t max_version; + +}; + + +/** + * Process GET /policy/$POL/meta response + * + * @param cls our `struct ANASTASIS_PolicyMetaLookupOperation *` + * @param response_code HTTP status + * @param data response body, a `json_t *`, NULL on error + */ +static void +handle_policy_meta_lookup_finished (void *cls, + long response_code, + const void *response) +{ + struct ANASTASIS_PolicyMetaLookupOperation *plo = cls; + const json_t *json = response; + struct ANASTASIS_MetaDownloadDetails mdd = { + .http_status = response_code, + .response = json + }; + + plo->job = NULL; + switch (response_code) + { + case 0: + /* Hard error */ + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Backend didn't even return from GET /policy\n"); + break; + case MHD_HTTP_OK: + { + size_t mlen = json_object_size (json); + + /* put a cap, as we will stack-allocate below and the + current service LIMITs the result to 1000 anyway; + could theoretically be increased in the future, but + then we should not put this onto the stack anymore... */ + if (mlen > 10000) + { + GNUNET_break (0); + response_code = 0; + break; + } + { + struct ANASTASIS_MetaDataEntry metas[GNUNET_NZL (mlen)]; + void *md[GNUNET_NZL (mlen)]; + size_t off = 0; + const char *label; + const json_t *val; + + memset (md, + 0, + sizeof (md)); + mdd.details.ok.metas = metas; + mdd.details.ok.metas_length = mlen; + json_object_foreach ((json_t *) json, + label, + val) + { + unsigned int ver; + char dummy; + struct GNUNET_JSON_Specification spec[] = { + GNUNET_JSON_spec_varsize ("meta", + &md[off], + &metas[off].meta_data_size), + GNUNET_JSON_spec_timestamp ("upload_time", + &metas[off].server_time), + GNUNET_JSON_spec_end () + }; + + if (1 != sscanf (label, + "%u%c", + &ver, + &dummy)) + { + GNUNET_break (0); + mdd.http_status = 0; + mdd.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + break; + } + if (GNUNET_OK != + GNUNET_JSON_parse (val, + spec, + NULL, NULL)) + { + GNUNET_break_op (0); + mdd.http_status = 0; + mdd.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + break; + } + metas[off].version = (uint32_t) ver; + metas[off].meta_data = md[off]; + off++; + } + if (off < mlen) + { + GNUNET_break (0); + mdd.http_status = 0; + mdd.ec = TALER_EC_GENERIC_REPLY_MALFORMED; + for (size_t i = 0; i<off; i++) + GNUNET_free (md[i]); + break; + } + plo->cb (plo->cb_cls, + &mdd); + for (size_t i = 0; i<off; i++) + GNUNET_free (md[i]); + plo->cb = NULL; + } + ANASTASIS_policy_meta_lookup_cancel (plo); + 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 (0); + break; + } + GNUNET_log (GNUNET_ERROR_TYPE_INFO, + "HTTP status for policy meta lookup is %u\n", + (unsigned int) response_code); + plo->cb (plo->cb_cls, + &mdd); + plo->cb = NULL; + ANASTASIS_policy_meta_lookup_cancel (plo); +} + + +struct ANASTASIS_PolicyMetaLookupOperation * +ANASTASIS_policy_meta_lookup ( + struct GNUNET_CURL_Context *ctx, + const char *backend_url, + const struct ANASTASIS_CRYPTO_AccountPublicKeyP *anastasis_pub, + uint32_t max_version, + ANASTASIS_PolicyMetaLookupCallback cb, + void *cb_cls) +{ + struct ANASTASIS_PolicyMetaLookupOperation *plo; + CURL *eh; + char *path; + + // FIXME: pass 'max_version' in CURL request! + GNUNET_assert (NULL != cb); + plo = GNUNET_new (struct ANASTASIS_PolicyMetaLookupOperation); + plo->account_pub = *anastasis_pub; + { + char *acc_pub_str; + + acc_pub_str = GNUNET_STRINGS_data_to_string_alloc (anastasis_pub, + sizeof (*anastasis_pub)); + GNUNET_asprintf (&path, + "policy/%s/meta", + acc_pub_str); + GNUNET_free (acc_pub_str); + } + plo->url = TALER_url_join (backend_url, + path, + NULL); + GNUNET_free (path); + eh = ANASTASIS_curl_easy_get_ (plo->url); + GNUNET_assert (NULL != eh); + plo->cb = cb; + plo->cb_cls = cb_cls; + plo->job = GNUNET_CURL_job_add (ctx, + eh, + &handle_policy_meta_lookup_finished, + plo); + return plo; +} + + +void +ANASTASIS_policy_meta_lookup_cancel ( + struct ANASTASIS_PolicyMetaLookupOperation *plo) +{ + if (NULL != plo->job) + { + GNUNET_CURL_job_cancel (plo->job); + plo->job = NULL; + } + GNUNET_free (plo->url); + GNUNET_free (plo); +} |