| /* |
| * |
| * 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 <stdio.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/cmdline.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/lib/security/credentials/composite/composite_credentials.h" |
| #include "src/core/lib/security/credentials/credentials.h" |
| #include "src/core/lib/slice/slice_string_helpers.h" |
| #include "src/core/lib/support/string.h" |
| |
| typedef struct { |
| gpr_mu *mu; |
| grpc_polling_entity pops; |
| bool is_done; |
| |
| grpc_credentials_mdelem_array md_array; |
| grpc_closure on_request_metadata; |
| } synchronizer; |
| |
| static void on_metadata_response(grpc_exec_ctx *exec_ctx, void *arg, |
| grpc_error *error) { |
| synchronizer *sync = arg; |
| if (error != GRPC_ERROR_NONE) { |
| fprintf(stderr, "Fetching token failed: %s\n", grpc_error_string(error)); |
| } else { |
| char *token; |
| GPR_ASSERT(sync->md_array.size == 1); |
| token = grpc_slice_to_c_string(GRPC_MDVALUE(sync->md_array.md[0])); |
| printf("\nGot token: %s\n\n", token); |
| gpr_free(token); |
| } |
| gpr_mu_lock(sync->mu); |
| sync->is_done = true; |
| GRPC_LOG_IF_ERROR( |
| "pollset_kick", |
| grpc_pollset_kick(exec_ctx, grpc_polling_entity_pollset(&sync->pops), |
| NULL)); |
| gpr_mu_unlock(sync->mu); |
| } |
| |
| int main(int argc, char **argv) { |
| int result = 0; |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| synchronizer sync; |
| grpc_channel_credentials *creds = NULL; |
| char *service_url = "https://test.foo.google.com/Foo"; |
| grpc_auth_metadata_context context; |
| gpr_cmdline *cl = gpr_cmdline_create("print_google_default_creds_token"); |
| gpr_cmdline_add_string(cl, "service_url", |
| "Service URL for the token request.", &service_url); |
| gpr_cmdline_parse(cl, argc, argv); |
| memset(&context, 0, sizeof(context)); |
| context.service_url = service_url; |
| |
| grpc_init(); |
| |
| creds = grpc_google_default_credentials_create(); |
| if (creds == NULL) { |
| fprintf(stderr, "\nCould not find default credentials.\n\n"); |
| result = 1; |
| goto end; |
| } |
| |
| memset(&sync, 0, sizeof(sync)); |
| grpc_pollset *pollset = gpr_zalloc(grpc_pollset_size()); |
| grpc_pollset_init(pollset, &sync.mu); |
| sync.pops = grpc_polling_entity_create_from_pollset(pollset); |
| sync.is_done = false; |
| GRPC_CLOSURE_INIT(&sync.on_request_metadata, on_metadata_response, &sync, |
| grpc_schedule_on_exec_ctx); |
| |
| grpc_error *error = GRPC_ERROR_NONE; |
| if (grpc_call_credentials_get_request_metadata( |
| &exec_ctx, ((grpc_composite_channel_credentials *)creds)->call_creds, |
| &sync.pops, context, &sync.md_array, &sync.on_request_metadata, |
| &error)) { |
| // Synchronous response. Invoke callback directly. |
| on_metadata_response(&exec_ctx, &sync, error); |
| GRPC_ERROR_UNREF(error); |
| } |
| |
| gpr_mu_lock(sync.mu); |
| while (!sync.is_done) { |
| grpc_pollset_worker *worker = NULL; |
| if (!GRPC_LOG_IF_ERROR( |
| "pollset_work", |
| grpc_pollset_work(&exec_ctx, |
| grpc_polling_entity_pollset(&sync.pops), &worker, |
| GRPC_MILLIS_INF_FUTURE))) |
| sync.is_done = true; |
| gpr_mu_unlock(sync.mu); |
| grpc_exec_ctx_flush(&exec_ctx); |
| gpr_mu_lock(sync.mu); |
| } |
| gpr_mu_unlock(sync.mu); |
| |
| grpc_exec_ctx_finish(&exec_ctx); |
| |
| grpc_channel_credentials_release(creds); |
| gpr_free(grpc_polling_entity_pollset(&sync.pops)); |
| |
| end: |
| gpr_cmdline_destroy(cl); |
| grpc_shutdown(); |
| return result; |
| } |