1 files changed, 114 insertions, 0 deletions
diff --git a/test/core/security/oauth2_utils.cc b/test/core/security/oauth2_utils.cc
new file mode 100644
index 0000000000..3282701cfa
--- /dev/null
+++ b/test/core/security/oauth2_utils.cc
@@ -0,0 +1,114 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "test/core/security/oauth2_utils.h"
+
+#include <string.h>
+
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
+#include <grpc/slice.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+
+#include "src/core/lib/security/credentials/credentials.h"
+
+typedef struct {
+  gpr_mu *mu;
+  grpc_polling_entity pops;
+  bool is_done;
+  char *token;
+
+  grpc_credentials_mdelem_array md_array;
+  grpc_closure closure;
+} oauth2_request;
+
+static void on_oauth2_response(void *arg, grpc_error *error) {
+  oauth2_request *request = (oauth2_request *)arg;
+  char *token = NULL;
+  grpc_slice token_slice;
+  if (error != GRPC_ERROR_NONE) {
+    gpr_log(GPR_ERROR, "Fetching token failed: %s", grpc_error_string(error));
+  } else {
+    GPR_ASSERT(request->md_array.size == 1);
+    token_slice = GRPC_MDVALUE(request->md_array.md[0]);
+    token = (char *)gpr_malloc(GRPC_SLICE_LENGTH(token_slice) + 1);
+    memcpy(token, GRPC_SLICE_START_PTR(token_slice),
+           GRPC_SLICE_LENGTH(token_slice));
+    token[GRPC_SLICE_LENGTH(token_slice)] = '\0';
+  }
+  grpc_credentials_mdelem_array_destroy(&request->md_array);
+  gpr_mu_lock(request->mu);
+  request->is_done = true;
+  request->token = token;
+  GRPC_LOG_IF_ERROR(
+      "pollset_kick",
+      grpc_pollset_kick(grpc_polling_entity_pollset(&request->pops), NULL));
+  gpr_mu_unlock(request->mu);
+}
+
+static void do_nothing(void *unused, grpc_error *error) {}
+
+char *grpc_test_fetch_oauth2_token_with_credentials(
+    grpc_call_credentials *creds) {
+  oauth2_request request;
+  memset(&request, 0, sizeof(request));
+  ExecCtx _local_exec_ctx;
+  grpc_closure do_nothing_closure;
+  grpc_auth_metadata_context null_ctx = {"", "", NULL, NULL};
+
+  grpc_pollset *pollset = (grpc_pollset *)gpr_zalloc(grpc_pollset_size());
+  grpc_pollset_init(pollset, &request.mu);
+  request.pops = grpc_polling_entity_create_from_pollset(pollset);
+  request.is_done = false;
+
+  GRPC_CLOSURE_INIT(&do_nothing_closure, do_nothing, NULL,
+                    grpc_schedule_on_exec_ctx);
+
+  GRPC_CLOSURE_INIT(&request.closure, on_oauth2_response, &request,
+                    grpc_schedule_on_exec_ctx);
+
+  grpc_error *error = GRPC_ERROR_NONE;
+  if (grpc_call_credentials_get_request_metadata(creds, &request.pops, null_ctx,
+                                                 &request.md_array,
+                                                 &request.closure, &error)) {
+    // Synchronous result; invoke callback directly.
+    on_oauth2_response(&request, error);
+    GRPC_ERROR_UNREF(error);
+  }
+  grpc_exec_ctx_flush();
+
+  gpr_mu_lock(request.mu);
+  while (!request.is_done) {
+    grpc_pollset_worker *worker = NULL;
+    if (!GRPC_LOG_IF_ERROR(
+            "pollset_work",
+            grpc_pollset_work(grpc_polling_entity_pollset(&request.pops),
+                              &worker, GRPC_MILLIS_INF_FUTURE))) {
+      request.is_done = true;
+    }
+  }
+  gpr_mu_unlock(request.mu);
+
+  grpc_pollset_shutdown(grpc_polling_entity_pollset(&request.pops),
+                        &do_nothing_closure);
+  grpc_exec_ctx_finish();
+  gpr_free(grpc_polling_entity_pollset(&request.pops));
+  return request.token;
+}