[taler-exchange] 102/130: add oauth service faker

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grothoff pushed a commit to branch master
in repository exchange.

commit 38c71808066384cc7101e06eea4aeff8d84902a0
Author: Christian Grothoff <christian@grothoff.org>
AuthorDate: Sun Nov 7 23:42:03 2021 +0100

    add oauth service faker
---
 src/testing/Makefile.am             |   2 +
 src/testing/testing_api_cmd_oauth.c | 244 ++++++++++++++++++++++++++++++++++++
 2 files changed, 246 insertions(+)

diff --git a/src/testing/Makefile.am b/src/testing/Makefile.am
index f51c73b8..6d2ddf46 100644
--- a/src/testing/Makefile.am
+++ b/src/testing/Makefile.am
@@ -64,6 +64,7 @@ libtalertesting_la_SOURCES = \
   testing_api_cmd_kyc_check_get.c \
   testing_api_cmd_kyc_proof.c \
   testing_api_cmd_kyc_wallet_get.c \
+  testing_api_cmd_oauth.c \
   testing_api_cmd_offline_sign_fees.c \
   testing_api_cmd_offline_sign_keys.c \
   testing_api_cmd_set_wire_fee.c \
@@ -94,6 +95,7 @@ libtalertesting_la_LIBADD = \
   $(top_builddir)/src/lib/libtalerauditor.la \
   $(top_builddir)/src/lib/libtalerexchange.la \
   $(top_builddir)/src/json/libtalerjson.la \
+  $(top_builddir)/src/mhd/libtalermhd.la \
   $(top_builddir)/src/util/libtalerutil.la \
   $(top_builddir)/src/bank-lib/libtalerbank.la \
   $(top_builddir)/src/bank-lib/libtalerfakebank.la \
diff --git a/src/testing/testing_api_cmd_oauth.c 
b/src/testing/testing_api_cmd_oauth.c
new file mode 100644
index 00000000..0040c74e
--- /dev/null
+++ b/src/testing/testing_api_cmd_oauth.c
@@ -0,0 +1,244 @@
+/*
+  This file is part of TALER
+  Copyright (C) 2021 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 testing/testing_api_cmd_oauth.c
+ * @brief Implement a CMD to run an OAuth service for faking the legitimation 
service
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_json_lib.h"
+#include <gnunet/gnunet_curl_lib.h>
+#include "taler_testing_lib.h"
+#include "taler_mhd_lib.h"
+
+/**
+ * State for the oauth CMD.
+ */
+struct OAuthState
+{
+
+  /**
+   * Handle to the "oauth" service.
+   */
+  struct MHD_Daemon *mhd;
+
+  /**
+   * Port to listen on.
+   */
+  uint16_t port;
+};
+
+
+/**
+ * A client has requested the given url using the given method
+ * (#MHD_HTTP_METHOD_GET, #MHD_HTTP_METHOD_PUT,
+ * #MHD_HTTP_METHOD_DELETE, #MHD_HTTP_METHOD_POST, etc).  The callback
+ * must call MHD callbacks to provide content to give back to the
+ * client and return an HTTP status code (i.e. #MHD_HTTP_OK,
+ * #MHD_HTTP_NOT_FOUND, etc.).
+ *
+ * @param cls argument given together with the function
+ *        pointer when the handler was registered with MHD
+ * @param url the requested url
+ * @param method the HTTP method used (#MHD_HTTP_METHOD_GET,
+ *        #MHD_HTTP_METHOD_PUT, etc.)
+ * @param version the HTTP version string (i.e.
+ *        #MHD_HTTP_VERSION_1_1)
+ * @param upload_data the data being uploaded (excluding HEADERS,
+ *        for a POST that fits into memory and that is encoded
+ *        with a supported encoding, the POST data will NOT be
+ *        given in upload_data and is instead available as
+ *        part of #MHD_get_connection_values; very large POST
+ *        data *will* be made available incrementally in
+ *        @a upload_data)
+ * @param[in,out] upload_data_size set initially to the size of the
+ *        @a upload_data provided; the method must update this
+ *        value to the number of bytes NOT processed;
+ * @param[in,out] con_cls pointer that the callback can set to some
+ *        address and that will be preserved by MHD for future
+ *        calls for this request; since the access handler may
+ *        be called many times (i.e., for a PUT/POST operation
+ *        with plenty of upload data) this allows the application
+ *        to easily associate some request-specific state.
+ *        If necessary, this state can be cleaned up in the
+ *        global #MHD_RequestCompletedCallback (which
+ *        can be set with the #MHD_OPTION_NOTIFY_COMPLETED).
+ *        Initially, `*con_cls` will be NULL.
+ * @return #MHD_YES if the connection was handled successfully,
+ *         #MHD_NO if the socket must be closed due to a serious
+ *         error while handling the request
+ */
+static enum MHD_Result
+handler_cb (void *cls,
+            struct MHD_Connection *connection,
+            const char *url,
+            const char *method,
+            const char *version,
+            const char *upload_data,
+            size_t *upload_data_size,
+            void **con_cls)
+{
+  const char *code;
+  const char *client_id;
+  const char *redirect_uri;
+  const char *client_secret;
+  unsigned int hc;
+  json_t *body;
+
+  code = MHD_lookup_connection_value (connection,
+                                      MHD_GET_ARGUMENT_KIND,
+                                      "code");
+  client_id = MHD_lookup_connection_value (connection,
+                                           MHD_GET_ARGUMENT_KIND,
+                                           "client_id");
+  redirect_uri = MHD_lookup_connection_value (connection,
+                                              MHD_GET_ARGUMENT_KIND,
+                                              "redirect_uri");
+  client_secret = MHD_lookup_connection_value (connection,
+                                               MHD_GET_ARGUMENT_KIND,
+                                               "client_secret");
+  if ( (NULL == code) ||
+       (NULL == client_id) ||
+       (NULL == redirect_uri) ||
+       (NULL == client_secret) )
+  {
+    GNUNET_break (0);
+    return MHD_NO;
+  }
+  if (0 != strcmp (client_id,
+                   "taler-exchange"))
+  {
+    body = GNUNET_JSON_PACK (
+      GNUNET_JSON_pack_string ("error",
+                               "unknown_client"),
+      GNUNET_JSON_pack_string ("error_description",
+                               "only 'taler-exchange' is allowed"));
+    hc = MHD_HTTP_NOT_FOUND;
+  }
+  else if (0 != strcmp (client_secret,
+                        "exchange-secret"))
+  {
+    body = GNUNET_JSON_PACK (
+      GNUNET_JSON_pack_string ("error",
+                               "invalid_client_secret"),
+      GNUNET_JSON_pack_string ("error_description",
+                               "only 'exchange-secret' is valid"));
+    hc = MHD_HTTP_FORBIDDEN;
+  }
+  else
+  {
+    if (0 != strcmp (code,
+                     "pass"))
+    {
+      body = GNUNET_JSON_PACK (
+        GNUNET_JSON_pack_string ("error",
+                                 "invalid_grant"),
+        GNUNET_JSON_pack_string ("error_description",
+                                 "only 'pass' shall pass"));
+      hc = MHD_HTTP_FORBIDDEN;
+    }
+    else
+    {
+      body = GNUNET_JSON_PACK (
+        GNUNET_JSON_pack_string ("access_token",
+                                 "good"),
+        GNUNET_JSON_pack_string ("token_type",
+                                 "bearer"),
+        GNUNET_JSON_pack_uint64 ("expires_in",
+                                 3600),
+        GNUNET_JSON_pack_string ("refresh_token",
+                                 "better"));
+      hc = MHD_HTTP_OK;
+    }
+  }
+  return TALER_MHD_reply_json_steal (connection,
+                                     body,
+                                     hc);
+}
+
+
+/**
+ * Run the command.
+ *
+ * @param cls closure.
+ * @param cmd the command to execute.
+ * @param is the interpreter state.
+ */
+static void
+oauth_run (void *cls,
+           const struct TALER_TESTING_Command *cmd,
+           struct TALER_TESTING_Interpreter *is)
+{
+  struct OAuthState *oas = cls;
+
+  (void) cmd;
+  (void) is;
+  oas->mhd = MHD_start_daemon (MHD_USE_AUTO_INTERNAL_THREAD,
+                               oas->port,
+                               NULL, NULL,
+                               &handler_cb, oas,
+                               NULL);
+}
+
+
+/**
+ * Cleanup the state from a "oauth" CMD, and possibly cancel a operation
+ * thereof.
+ *
+ * @param cls closure.
+ * @param cmd the command which is being cleaned up.
+ */
+static void
+oauth_cleanup (void *cls,
+               const struct TALER_TESTING_Command *cmd)
+{
+  struct OAuthState *oas = cls;
+
+  if (NULL != oas->mhd)
+  {
+    MHD_stop_daemon (oas->mhd);
+    oas->mhd = NULL;
+  }
+  GNUNET_free (oas);
+}
+
+
+struct TALER_TESTING_Command
+TALER_TESTING_cmd_oauth (const char *label,
+                         uint16_t port)
+{
+  struct OAuthState *oas;
+
+  oas = GNUNET_new (struct OAuthState);
+  oas->port = port;
+  {
+    struct TALER_TESTING_Command cmd = {
+      .cls = oas,
+      .label = label,
+      .run = &oauth_run,
+      .cleanup = &oauth_cleanup,
+    };
+
+    return cmd;
+  }
+}
+
+
+/* end of testing_api_cmd_kyc_proof.c */

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