[taler-exchange] 64/124: get AML measures skeleton"

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grothoff pushed a commit to tag cg-aml-branch-compiles
in repository exchange.

commit f2dc8cc9c1e7aac55713bbec5de278f7f2867357
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sun Jun 23 22:14:07 2024 +0200

    get AML measures skeleton"
---
 src/lib/Makefile.am                     |   1 +
 src/lib/exchange_api_get_aml_measures.c | 492 ++++++++++++++++++++++++++++++++
 2 files changed, 493 insertions(+)

diff --git a/src/lib/Makefile.am b/src/lib/Makefile.am
index 626b60c12..73de1cab6 100644
--- a/src/lib/Makefile.am
+++ b/src/lib/Makefile.am
@@ -36,6 +36,7 @@ libtalerexchange_la_SOURCES = \
   exchange_api_csr_withdraw.c \
   exchange_api_handle.c exchange_api_handle.h \
   exchange_api_deposits_get.c \
+  exchange_api_get_aml_measures.c \
   exchange_api_kyc_check.c \
   exchange_api_kyc_proof.c \
   exchange_api_kyc_wallet.c \
diff --git a/src/lib/exchange_api_get_aml_measures.c 
b/src/lib/exchange_api_get_aml_measures.c
new file mode 100644
index 000000000..23971a305
--- /dev/null
+++ b/src/lib/exchange_api_get_aml_measures.c
@@ -0,0 +1,492 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2023, 2024 Taler Systems SA
+
+  TALER 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 3, or (at your option) any later version.
+
+  TALER 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
+  TALER; see the file COPYING.  If not, see
+  <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file lib/exchange_api_get_aml_measures.c
+ * @brief Implementation of the GET /aml/$OFFICER_PUB/measures request
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <microhttpd.h> /* just for HTTP status codes */
+#include <gnunet/gnunet_util_lib.h>
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_exchange_service.h"
+#include "taler_json_lib.h"
+#include "exchange_api_handle.h"
+#include "taler_signatures.h"
+#include "exchange_api_curl_defaults.h"
+
+
+/**
+ * @brief A GET /aml/$OFFICER_PUB/measures Handle
+ */
+struct TALER_EXCHANGE_AmlGetMeasuresHandle
+{
+
+  /**
+   * The url for this request.
+   */
+  char *url;
+
+  /**
+   * Handle for the request.
+   */
+  struct GNUNET_CURL_Job *job;
+
+  /**
+   * Function to call with the result.
+   */
+  TALER_EXCHANGE_AmlMeasuresCallback measures_cb;
+
+  /**
+   * Closure for @e measures_cb.
+   */
+  void *measures_cb_cls;
+
+  /**
+   * HTTP headers for the job.
+   */
+  struct curl_slist *job_headers;
+
+};
+
+
+/**
+ * Parse AML measures.
+ *
+ * @param jroots JSON object with measure data
+ * @param[out] roots where to write the result
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+parse_aml_roots (
+  const json_t *jroots,
+  struct TALER_EXCHANGE_AvailableAmlMeasures *roots)
+{
+  const json_t *obj;
+  const char *name;
+  size_t idx = 0;
+
+  json_object_foreach ((json_t *) jroots, name, obj)
+  {
+    struct TALER_EXCHANGE_AvailableAmlMeasures *root
+      = &roots[idx++];
+    struct GNUNET_JSON_Specification spec[] = {
+      GNUNET_JSON_spec_string ("check_name",
+                               &root->check_name),
+      GNUNET_JSON_spec_string ("prog_name",
+                               &root->prog_name),
+      GNUNET_JSON_spec_mark_optional (
+        GNUNET_JSON_spec_object_const ("context",
+                                       &root->context),
+        NULL),
+      GNUNET_JSON_spec_end ()
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_JSON_parse (obj,
+                           spec,
+                           NULL,
+                           NULL))
+    {
+      GNUNET_break_op (0);
+      return GNUNET_SYSERR;
+    }
+    root->measure_name = name;
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Parse AML programs.
+ *
+ * @param[in,out] lh context for allocations
+ * @param jroots JSON object with program data
+ * @param[out] roots where to write the result
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+parse_aml_programs (
+  struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh,
+  const json_t *jprogs,
+  struct TALER_EXCHANGE_AvailableAmlPrograms *progs)
+{
+  const json_t *obj;
+  const char *name;
+  size_t idx = 0;
+
+  json_object_foreach ((json_t *) jprogs, name, obj)
+  {
+    struct TALER_EXCHANGE_AvailableAmlPrograms *prog
+      = &progs[idx++];
+    const json_t *jcontext;
+    const json_t *jinputs;
+    struct GNUNET_JSON_Specification spec[] = {
+      GNUNET_JSON_spec_string ("description",
+                               &prog->description),
+      GNUNET_JSON_spec_array_const ("context",
+                                    &jcontext),
+      GNUNET_JSON_spec_array_const ("inputs",
+                                    &jinputs),
+      GNUNET_JSON_spec_end ()
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_JSON_parse (obj,
+                           spec,
+                           NULL,
+                           NULL))
+    {
+      GNUNET_break_op (0);
+      return GNUNET_SYSERR;
+    }
+    prog->prog_name = name;
+    // FIXME: do something with jcontext + jinputs!
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Parse AML measures.
+ *
+ * @param[in,out] lh context for allocations
+ * @param jchecks JSON object with measure data
+ * @param[out] checks where to write the result
+ * @return #GNUNET_OK on success
+ */
+static enum GNUNET_GenericReturnValue
+parse_aml_checks (
+  struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh,
+  const json_t *jchecks,
+  struct TALER_EXCHANGE_AvailableKycChecks *checks)
+{
+  const json_t *obj;
+  const char *name;
+  size_t idx = 0;
+
+  json_object_foreach ((json_t *) jchecks, name, obj)
+  {
+    struct TALER_EXCHANGE_AvailableKycChecks *check
+      = &checks[idx++];
+    const json_t *jrequires;
+    const json_t *joutputs;
+    struct GNUNET_JSON_Specification spec[] = {
+      GNUNET_JSON_spec_string ("description",
+                               &check->description),
+      GNUNET_JSON_spec_mark_optional (
+        GNUNET_JSON_spec_object_const ("description_i18n",
+                                       &check->description_i18n),
+        NULL),
+      GNUNET_JSON_spec_array_const ("requires",
+                                    &jrequires),
+      GNUNET_JSON_spec_array_const ("outputs",
+                                    &joutputs),
+      GNUNET_JSON_spec_string ("fallback",
+                               &check->fallback),
+      GNUNET_JSON_spec_end ()
+    };
+
+    if (GNUNET_OK !=
+        GNUNET_JSON_parse (obj,
+                           spec,
+                           NULL,
+                           NULL))
+    {
+      GNUNET_break_op (0);
+      return GNUNET_SYSERR;
+    }
+    check->check_name = name;
+    // FIXME: do somethign with jrequires / joutputs!
+  }
+  return GNUNET_OK;
+}
+
+
+/**
+ * Parse the provided decision data from the "200 OK" response.
+ *
+ * @param[in,out] lh handle (callback may be zero'ed out)
+ * @param json json reply with the data for one coin
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on error
+ */
+static enum GNUNET_GenericReturnValue
+parse_measures_ok (struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh,
+                   const json_t *json)
+{
+  struct TALER_EXCHANGE_AmlGetMeasuresResponse lr = {
+    .hr.reply = json,
+    .hr.http_status = MHD_HTTP_OK
+  };
+  const json_t *jroots;
+  const json_t *jprograms;
+  const json_t *jchecks;
+  struct GNUNET_JSON_Specification spec[] = {
+    GNUNET_JSON_spec_object_const ("roots",
+                                   &jroots),
+    GNUNET_JSON_spec_object_const ("programs",
+                                   &jprograms),
+    GNUNET_JSON_spec_object_const ("checks",
+                                   &jchecks),
+    GNUNET_JSON_spec_end ()
+  };
+
+  if (GNUNET_OK !=
+      GNUNET_JSON_parse (json,
+                         spec,
+                         NULL,
+                         NULL))
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+  lr.details.ok.roots_length
+    = (unsigned int) json_object_size (jroots);
+  lr.details.ok.programs_length
+    = (unsigned int) json_object_size (jprograms);
+  lr.details.ok.checks_length
+    = (unsigned int) json_object_size (jchecks);
+  if ( ( ((size_t) lr.details.ok.roots_length)
+         != json_object_size (jroots)) ||
+       ( ((size_t) lr.details.ok.programs_length)
+         != json_object_size (jprograms)) ||
+       ( ((size_t) lr.details.ok.checks_length)
+         != json_object_size (jchecks)) )
+  {
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
+
+  {
+    struct TALER_EXCHANGE_AvailableAmlMeasures roots[
+      GNUNET_NZL (lr.details.ok.roots_length)];
+    struct TALER_EXCHANGE_AvailableAmlPrograms progs[
+      GNUNET_NZL (lr.details.ok.programs_length)];
+    struct TALER_EXCHANGE_AvailableKycChecks checks[
+      GNUNET_NZL (lr.details.ok.checks_length)];
+    enum GNUNET_GenericReturnValue ret;
+
+    memset (roots,
+            0,
+            sizeof (roots));
+    memset (progs,
+            0,
+            sizeof (progs));
+    memset (checks,
+            0,
+            sizeof (checks));
+    lr.details.ok.roots = roots;
+    lr.details.ok.programs = progs;
+    lr.details.ok.checks = checks;
+    ret = parse_aml_roots (jroots,
+                           roots);
+    if (GNUNET_OK == ret)
+      ret = parse_aml_programs (lh,
+                                jprograms,
+                                progs);
+    if (GNUNET_OK == ret)
+      ret = parse_aml_checks (lh,
+                              jchecks,
+                              checks);
+    if (GNUNET_OK == ret)
+    {
+      lh->measures_cb (lh->measures_cb_cls,
+                       &lr);
+      lh->measures_cb = NULL;
+    }
+    return ret;
+  }
+}
+
+
+/**
+ * Function called when we're done processing the
+ * HTTP /aml/$OFFICER_PUB/measures request.
+ *
+ * @param cls the `struct TALER_EXCHANGE_AmlGetMeasuresHandle`
+ * @param response_code HTTP response code, 0 on error
+ * @param response parsed JSON result, NULL on error
+ */
+static void
+handle_lookup_finished (void *cls,
+                        long response_code,
+                        const void *response)
+{
+  struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh = cls;
+  const json_t *j = response;
+  struct TALER_EXCHANGE_AmlGetMeasuresResponse lr = {
+    .hr.reply = j,
+    .hr.http_status = (unsigned int) response_code
+  };
+
+  lh->job = NULL;
+  switch (response_code)
+  {
+  case 0:
+    lr.hr.ec = TALER_EC_GENERIC_INVALID_RESPONSE;
+    break;
+  case MHD_HTTP_OK:
+    if (GNUNET_OK !=
+        parse_measures_ok (lh,
+                           j))
+    {
+      GNUNET_break_op (0);
+      lr.hr.http_status = 0;
+      lr.hr.ec = TALER_EC_GENERIC_REPLY_MALFORMED;
+      break;
+    }
+    GNUNET_assert (NULL == lh->measures_cb);
+    TALER_EXCHANGE_aml_get_measures_cancel (lh);
+    return;
+  case MHD_HTTP_NO_CONTENT:
+    break;
+  case MHD_HTTP_BAD_REQUEST:
+    lr.hr.ec = TALER_JSON_get_error_code (j);
+    lr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* This should never happen, either us or the exchange is buggy
+       (or API version conflict); just pass JSON reply to the application */
+    break;
+  case MHD_HTTP_FORBIDDEN:
+    lr.hr.ec = TALER_JSON_get_error_code (j);
+    lr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* Nothing really to verify, exchange says this coin was not melted; we
+       should pass the JSON reply to the application */
+    break;
+  case MHD_HTTP_INTERNAL_SERVER_ERROR:
+    lr.hr.ec = TALER_JSON_get_error_code (j);
+    lr.hr.hint = TALER_JSON_get_error_hint (j);
+    /* Server had an internal issue; we should retry, but this API
+       leaves this to the application */
+    break;
+  default:
+    /* unexpected response code */
+    GNUNET_break_op (0);
+    lr.hr.ec = TALER_JSON_get_error_code (j);
+    lr.hr.hint = TALER_JSON_get_error_hint (j);
+    GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+                "Unexpected response code %u/%d for lookup AML decisions\n",
+                (unsigned int) response_code,
+                (int) lr.hr.ec);
+    break;
+  }
+  if (NULL != lh->measures_cb)
+    lh->measures_cb (lh->measures_cb_cls,
+                     &lr);
+  TALER_EXCHANGE_aml_get_measures_cancel (lh);
+}
+
+
+struct TALER_EXCHANGE_AmlGetMeasuresHandle *
+TALER_EXCHANGE_aml_get_measures (
+  struct GNUNET_CURL_Context *ctx,
+  const char *exchange_url,
+  const struct TALER_AmlOfficerPrivateKeyP *officer_priv,
+  TALER_EXCHANGE_AmlMeasuresCallback cb,
+  void *cb_cls)
+{
+  struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh;
+  CURL *eh;
+  struct TALER_AmlOfficerPublicKeyP officer_pub;
+  struct TALER_AmlOfficerSignatureP officer_sig;
+  char arg_str[sizeof (struct TALER_AmlOfficerPublicKeyP) * 2
+               + 32];
+
+  GNUNET_CRYPTO_eddsa_key_get_public (&officer_priv->eddsa_priv,
+                                      &officer_pub.eddsa_pub);
+  TALER_officer_aml_query_sign (officer_priv,
+                                &officer_sig);
+  {
+    char pub_str[sizeof (officer_pub) * 2];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (
+      &officer_pub,
+      sizeof (officer_pub),
+      pub_str,
+      sizeof (pub_str));
+    *end = '\0';
+    GNUNET_snprintf (arg_str,
+                     sizeof (arg_str),
+                     "aml/%s/measures",
+                     pub_str);
+  }
+  lh = GNUNET_new (struct TALER_EXCHANGE_AmlGetMeasuresHandle);
+  lh->measures_cb = cb;
+  lh->measures_cb_cls = cb_cls;
+  lh->url = TALER_url_join (exchange_url,
+                            arg_str,
+                            NULL);
+  if (NULL == lh->url)
+  {
+    GNUNET_free (lh);
+    return NULL;
+  }
+  eh = TALER_EXCHANGE_curl_easy_get_ (lh->url);
+  if (NULL == eh)
+  {
+    GNUNET_break (0);
+    GNUNET_free (lh->url);
+    GNUNET_free (lh);
+    return NULL;
+  }
+  {
+    char *hdr;
+    char sig_str[sizeof (officer_sig) * 2];
+    char *end;
+
+    end = GNUNET_STRINGS_data_to_string (
+      &officer_sig,
+      sizeof (officer_sig),
+      sig_str,
+      sizeof (sig_str));
+    *end = '\0';
+
+    GNUNET_asprintf (&hdr,
+                     "%s: %s",
+                     TALER_AML_OFFICER_SIGNATURE_HEADER,
+                     sig_str);
+    lh->job_headers = curl_slist_append (NULL,
+                                         hdr);
+    GNUNET_free (hdr);
+    lh->job_headers = curl_slist_append (lh->job_headers,
+                                         "Content-type: application/json");
+    lh->job = GNUNET_CURL_job_add2 (ctx,
+                                    eh,
+                                    lh->job_headers,
+                                    &handle_lookup_finished,
+                                    lh);
+  }
+  return lh;
+}
+
+
+void
+TALER_EXCHANGE_aml_get_measures_cancel (
+  struct TALER_EXCHANGE_AmlGetMeasuresHandle *lh)
+{
+  if (NULL != lh->job)
+  {
+    GNUNET_CURL_job_cancel (lh->job);
+    lh->job = NULL;
+  }
+  curl_slist_free_all (lh->job_headers);
+  GNUNET_free (lh->url);
+  GNUNET_free (lh);
+}
+
+
+/* end of exchange_api_get_aml_measures.c */

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