1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <stdio.h>
20 #include <string.h>
21
22 #include <grpc/grpc.h>
23 #include <grpc/grpc_security.h>
24 #include <grpc/slice.h>
25 #include <grpc/support/alloc.h>
26 #include <grpc/support/log.h>
27 #include <grpc/support/sync.h>
28
29 #include "src/core/lib/gpr/string.h"
30 #include "src/core/lib/security/credentials/composite/composite_credentials.h"
31 #include "src/core/lib/security/credentials/credentials.h"
32 #include "src/core/lib/slice/slice_string_helpers.h"
33 #include "test/core/util/cmdline.h"
34
35 typedef struct {
36 gpr_mu* mu;
37 grpc_polling_entity pops;
38 bool is_done;
39
40 grpc_credentials_mdelem_array md_array;
41 grpc_closure on_request_metadata;
42 } synchronizer;
43
on_metadata_response(void * arg,grpc_error * error)44 static void on_metadata_response(void* arg, grpc_error* error) {
45 synchronizer* sync = static_cast<synchronizer*>(arg);
46 if (error != GRPC_ERROR_NONE) {
47 fprintf(stderr, "Fetching token failed: %s\n", grpc_error_string(error));
48 fflush(stderr);
49 } else {
50 char* token;
51 GPR_ASSERT(sync->md_array.size == 1);
52 token = grpc_slice_to_c_string(GRPC_MDVALUE(sync->md_array.md[0]));
53 printf("\nGot token: %s\n\n", token);
54 gpr_free(token);
55 }
56 gpr_mu_lock(sync->mu);
57 sync->is_done = true;
58 GRPC_LOG_IF_ERROR(
59 "pollset_kick",
60 grpc_pollset_kick(grpc_polling_entity_pollset(&sync->pops), nullptr));
61 gpr_mu_unlock(sync->mu);
62 }
63
main(int argc,char ** argv)64 int main(int argc, char** argv) {
65 int result = 0;
66 grpc_core::ExecCtx exec_ctx;
67 synchronizer sync;
68 grpc_channel_credentials* creds = nullptr;
69 const char* service_url = "https://test.foo.google.com/Foo";
70 grpc_auth_metadata_context context;
71 gpr_cmdline* cl = gpr_cmdline_create("print_google_default_creds_token");
72 grpc_pollset* pollset = nullptr;
73 grpc_error* error = nullptr;
74 gpr_cmdline_add_string(cl, "service_url",
75 "Service URL for the token request.", &service_url);
76 gpr_cmdline_parse(cl, argc, argv);
77 memset(&context, 0, sizeof(context));
78 context.service_url = service_url;
79
80 grpc_init();
81
82 creds = grpc_google_default_credentials_create();
83 if (creds == nullptr) {
84 fprintf(stderr, "\nCould not find default credentials.\n\n");
85 fflush(stderr);
86 result = 1;
87 goto end;
88 }
89
90 memset(&sync, 0, sizeof(sync));
91 pollset = static_cast<grpc_pollset*>(gpr_zalloc(grpc_pollset_size()));
92 grpc_pollset_init(pollset, &sync.mu);
93 sync.pops = grpc_polling_entity_create_from_pollset(pollset);
94 sync.is_done = false;
95 GRPC_CLOSURE_INIT(&sync.on_request_metadata, on_metadata_response, &sync,
96 grpc_schedule_on_exec_ctx);
97
98 error = GRPC_ERROR_NONE;
99 if (reinterpret_cast<grpc_composite_channel_credentials*>(creds)
100 ->mutable_call_creds()
101 ->get_request_metadata(&sync.pops, context, &sync.md_array,
102 &sync.on_request_metadata, &error)) {
103 // Synchronous response. Invoke callback directly.
104 on_metadata_response(&sync, error);
105 GRPC_ERROR_UNREF(error);
106 }
107
108 gpr_mu_lock(sync.mu);
109 while (!sync.is_done) {
110 grpc_pollset_worker* worker = nullptr;
111 if (!GRPC_LOG_IF_ERROR(
112 "pollset_work",
113 grpc_pollset_work(grpc_polling_entity_pollset(&sync.pops), &worker,
114 GRPC_MILLIS_INF_FUTURE)))
115 sync.is_done = true;
116 gpr_mu_unlock(sync.mu);
117 grpc_core::ExecCtx::Get()->Flush();
118 gpr_mu_lock(sync.mu);
119 }
120 gpr_mu_unlock(sync.mu);
121
122 grpc_channel_credentials_release(creds);
123 gpr_free(grpc_polling_entity_pollset(&sync.pops));
124
125 end:
126 gpr_cmdline_destroy(cl);
127 grpc_shutdown();
128 return result;
129 }
130