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_handle error)44 static void on_metadata_response(void* arg, grpc_error_handle error) {
45 synchronizer* sync = static_cast<synchronizer*>(arg);
46 if (error != GRPC_ERROR_NONE) {
47 fprintf(stderr, "Fetching token failed: %s\n",
48 grpc_error_std_string(error).c_str());
49 fflush(stderr);
50 } else {
51 char* token;
52 GPR_ASSERT(sync->md_array.size == 1);
53 token = grpc_slice_to_c_string(GRPC_MDVALUE(sync->md_array.md[0]));
54 printf("\nGot token: %s\n\n", token);
55 gpr_free(token);
56 }
57 gpr_mu_lock(sync->mu);
58 sync->is_done = true;
59 GRPC_LOG_IF_ERROR(
60 "pollset_kick",
61 grpc_pollset_kick(grpc_polling_entity_pollset(&sync->pops), nullptr));
62 gpr_mu_unlock(sync->mu);
63 }
64
main(int argc,char ** argv)65 int main(int argc, char** argv) {
66 int result = 0;
67 grpc_core::ExecCtx exec_ctx;
68 synchronizer sync;
69 grpc_channel_credentials* creds = nullptr;
70 const char* service_url = "https://test.foo.google.com/Foo";
71 grpc_auth_metadata_context context;
72 gpr_cmdline* cl = gpr_cmdline_create("print_google_default_creds_token");
73 grpc_pollset* pollset = nullptr;
74 grpc_error_handle error = GRPC_ERROR_NONE;
75 gpr_cmdline_add_string(cl, "service_url",
76 "Service URL for the token request.", &service_url);
77 gpr_cmdline_parse(cl, argc, argv);
78 memset(&context, 0, sizeof(context));
79 context.service_url = service_url;
80
81 grpc_init();
82
83 creds = grpc_google_default_credentials_create();
84 if (creds == nullptr) {
85 fprintf(stderr, "\nCould not find default credentials.\n\n");
86 fflush(stderr);
87 result = 1;
88 goto end;
89 }
90
91 memset(&sync, 0, sizeof(sync));
92 pollset = static_cast<grpc_pollset*>(gpr_zalloc(grpc_pollset_size()));
93 grpc_pollset_init(pollset, &sync.mu);
94 sync.pops = grpc_polling_entity_create_from_pollset(pollset);
95 sync.is_done = false;
96 GRPC_CLOSURE_INIT(&sync.on_request_metadata, on_metadata_response, &sync,
97 grpc_schedule_on_exec_ctx);
98
99 error = GRPC_ERROR_NONE;
100 if (reinterpret_cast<grpc_composite_channel_credentials*>(creds)
101 ->mutable_call_creds()
102 ->get_request_metadata(&sync.pops, context, &sync.md_array,
103 &sync.on_request_metadata, &error)) {
104 // Synchronous response. Invoke callback directly.
105 on_metadata_response(&sync, error);
106 GRPC_ERROR_UNREF(error);
107 }
108
109 gpr_mu_lock(sync.mu);
110 while (!sync.is_done) {
111 grpc_pollset_worker* worker = nullptr;
112 if (!GRPC_LOG_IF_ERROR(
113 "pollset_work",
114 grpc_pollset_work(grpc_polling_entity_pollset(&sync.pops), &worker,
115 GRPC_MILLIS_INF_FUTURE)))
116 sync.is_done = true;
117 gpr_mu_unlock(sync.mu);
118 grpc_core::ExecCtx::Get()->Flush();
119 gpr_mu_lock(sync.mu);
120 }
121 gpr_mu_unlock(sync.mu);
122
123 grpc_channel_credentials_release(creds);
124 gpr_free(grpc_polling_entity_pollset(&sync.pops));
125
126 end:
127 gpr_cmdline_destroy(cl);
128 grpc_shutdown();
129 return result;
130 }
131