Dear Paul,
I've got JSON file from Google console. I've also export
GOOGLE_APPLICATION_CREDENTIALS
and use the code following to connect google cloud speech to recognize
streaming audio. But it seem google cloud not response.
*..using google::cloud::speech::v1beta1::Speech;class GoogleClient
{ public: GoogleClient(std::shared_ptr<Channel> channel) :
stub_(Speech::NewStub(channel)) {} private: std::unique_ptr<Speech::Stub>
stub_;};int main(int argc, char** argv) { auto channel_creds =
grpc::GoogleDefaultCredentials(); auto channel =
grpc::CreateChannel("speech.googleapis.com:443", channel_creds);
GoogleClient ggclient(channel);..}*
I think, it need use the code:
*grpc::Status GetMetadata(*
* grpc::string_ref service_url, grpc::string_ref method_name,*
* const grpc::AuthContext& channel_auth_context,*
* std::multimap<grpc::string, grpc::string>* metadata) override {*
* metadata->insert(std::make_pair("Authorization", ticket_));*
* return grpc::Status::OK;*
* }*
* private:*
* grpc::string ticket_;*
*};*
*..*
*auto ssl_channel = grpc::SslCredentials(grpc::SslCredentialsOptions());*
*//get Access Token?*
*auto call_creds = grpc::MetadataCredentialsFromPlugin(*
* std::unique_ptr<grpc::MetadataCredentialsPlugin>(*
* new MyCustomAuthenticator("Access Token")));*
*//# CompositeChannelCredentials*
*auto channelComposite = grpc::CompositeChannelCredentials(ssl_channel,
call_creds);*
*//# Create channel*
*auto channel = grpc::CreateChannel("speech.googleapis.com:443",
channelComposite);*
But I don't know how to get access token. Please help me.
Thanks.
On Friday, August 26, 2016 at 3:27:40 PM UTC+7, Paul Grosu wrote:
>
> Dear Manh,
>
> I'm assuming you got the JSON file from the Google console, so just assign
> the path of the file to the environmental variable like this in shell - as
> described
> here
> <https://googlecloudplatform.github.io/gcloud-python/latest/gcloud-auth.html>
> :
>
> export GOOGLE_APPLICATION_CREDENTIALS=/path/to/keyfile.json
>
> And your gRPC application will take care of the rest by looking for this
> environment variable. You don't need to specify a token - it really is
> that simple.
>
> Paul
>
>
> On Friday, August 26, 2016 at 3:49:26 AM UTC-4, Manh Tran wrote:
>>
>> Dear Paul,
>>
>> The my credentials-key.json have format:
>> *{*
>> * "type": "service_account",*
>> * "project_id": "",*
>> * "private_key_id": "",*
>> * "private_key": "",*
>> * "client_email": "",*
>> * "client_id": "",*
>> * "auth_uri": "https://accounts.google.com/o/oauth2/auth
>> <https://accounts.google.com/o/oauth2/auth>",*
>> * "token_uri": "https://accounts.google.com/o/oauth2/token
>> <https://accounts.google.com/o/oauth2/token>",*
>> * "auth_provider_x509_cert_url":
>> "https://www.googleapis.com/oauth2/v1/certs
>> <https://www.googleapis.com/oauth2/v1/certs>",*
>> * "client_x509_cert_url":
>> "https://www.googleapis.com/robot/v1/metadata/x509/643974956331%40developer.gserviceaccount.com
>>
>> <https://www.googleapis.com/robot/v1/metadata/x509/643974956331%40developer.gserviceaccount.com>"*
>> *}*
>>
>> In my C++ program, I would like to using directly this information to get
>> token from google's. Please show me how to do it.
>>
>> Thanks.
>>
>> On Friday, August 26, 2016 at 12:40:43 PM UTC+7, Paul Grosu wrote:
>>>
>>> Hi Manh,
>>>
>>> By the way gRPC does this automatically via the
>>> GOOGLE_APPLICATION_CREDENTIALS environment variable defined in
>>> grpc_security_constants.h
>>> <https://github.com/grpc/grpc/blob/dde6dfbb0bd1dfb3deac0b4f703d63528e1dc798/include/grpc/grpc_security_constants.h#L54-L57>
>>> :
>>>
>>> /* Environment variable that points to the google default application
>>> credentials json key or refresh token. Used in the
>>> grpc_google_default_credentials_create function. */
>>> #define GRPC_GOOGLE_CREDENTIALS_ENV_VAR
>>> "GOOGLE_APPLICATION_CREDENTIALS"
>>>
>>> Keep in mind if you go via the the GoogleDefaultCredentials() function
>>> - as Yang previously suggested - it basically performs several checks to
>>> find a way to authenticate you. Basically the call in
>>> secure_credentials.cc
>>> <https://github.com/grpc/grpc/blob/master/src/cpp/client/secure_credentials.cc#L84-L87>
>>>
>>> calls grpc_google_default_credentials_create()as such:
>>>
>>> std::shared_ptr<ChannelCredentials> GoogleDefaultCredentials() {
>>> GrpcLibraryCodegen init; // To call grpc_init().
>>> return
>>> WrapChannelCredentials(grpc_google_default_credentials_create());
>>> }
>>>
>>> Which grpc_google_default_credentials_create() goes through a
>>> multitude of checks in google_default_credentials.c
>>> <https://github.com/grpc/grpc/blob/master/src/core/lib/security/credentials/google_default/google_default_credentials.c>
>>> :
>>>
>>> grpc_channel_credentials *grpc_google_default_credentials_create(void)
>>> {
>>> ...
>>> /* First, try the environment variable. */
>>> err = create_default_creds_from_path(
>>> gpr_getenv(GRPC_GOOGLE_CREDENTIALS_ENV_VAR), &call_creds);
>>> ...
>>>
>>> /* Then the well-known file. */
>>> err = create_default_creds_from_path(
>>> grpc_get_well_known_google_credentials_file_path(), &call_creds);
>>> ...
>>>
>>> /* At last try to see if we're on compute engine (do the detection
>>> only once
>>> since it requires a network test). */
>>> if (!compute_engine_detection_done) {
>>> int need_compute_engine_creds =
>>> is_stack_running_on_compute_engine();
>>> compute_engine_detection_done = 1;
>>> if (need_compute_engine_creds) {
>>> call_creds = grpc_google_compute_engine_credentials_create(NULL);
>>> ...
>>> }
>>>
>>> Then create_default_creds_from_path() performs these two checks:
>>>
>>> /* First, try an auth json key. */
>>> key = grpc_auth_json_key_create_from_json(json);
>>> ...
>>>
>>> /* Then try a refresh token if the auth json key was invalid. */
>>> token = grpc_auth_refresh_token_create_from_json(json);
>>> ...
>>>
>>> And the last function above looks up the stored gcloud credentials:
>>>
>>> char *grpc_get_well_known_google_credentials_file_path(void) {
>>> if (creds_path_getter != NULL) return creds_path_getter();
>>> return grpc_get_well_known_google_credentials_file_path_impl();
>>> }
>>>
>>> The returned function call is in credentials_posix.c
>>> <https://github.com/grpc/grpc/blob/master/src/core/lib/security/credentials/google_default/credentials_posix.c#L54-L56>
>>> :
>>>
>>> gpr_asprintf(&result, "%s/.config/%s/%s", home,
>>> GRPC_GOOGLE_CLOUD_SDK_CONFIG_DIRECTORY,
>>> GRPC_GOOGLE_WELL_KNOWN_CREDENTIALS_FILE);
>>>
>>> And the two above variables are stored in google_default_credentials.h
>>> <https://github.com/grpc/grpc/blob/master/src/core/lib/security/credentials/google_default/google_default_credentials.h#L39-L41>
>>> :
>>>
>>> #define GRPC_GOOGLE_CLOUD_SDK_CONFIG_DIRECTORY "gcloud"
>>> #define GRPC_GOOGLE_WELL_KNOWN_CREDENTIALS_FILE \
>>> "application_default_credentials.json"
>>>
>>> If you tried to see if you have this file - which you will by running
>>> gcloud beta auth application-default login - you will see the following
>>> directory as constructed above (the one below is for how it looks for me):
>>>
>>> $ ls ~/.config/gcloud/application_default_credentials.json
>>> /home/pgrosu/.config/gcloud/application_default_credentials.json
>>> $
>>>
>>> And sure it is possible via the Google APIs Client Library for C++
>>> <https://github.com/google/google-api-cpp-client>. In the example file
>>> <https://github.com/google/google-api-cpp-client/blob/master/src/samples/webflow_sample_main.cc>
>>>
>>> you'll notice the following on lines 657-661
>>> <https://github.com/google/google-api-cpp-client/blob/master/src/samples/webflow_sample_main.cc#L657-L661>
>>> :
>>>
>>> googleapis::util::Status status;
>>> flow_.reset(OAuth2AuthorizationFlow::MakeFlowFromClientSecretsPath(
>>> FLAGS_client_secrets_path,
>>> config_->NewDefaultTransportOrDie(),
>>> &status));
>>>
>>> I think you might also find the following links helpful:
>>>
>>> https://developers.google.com/identity/protocols/OAuth2
>>>
>>>
>>> http://google.github.io/google-api-cpp-client/latest/doxygen/classgoogleapis_1_1client_1_1OAuth2AuthorizationFlow.html
>>>
>>>
>>> http://google.github.io/google-api-cpp-client/latest/doxygen/classgoogleapis_1_1client_1_1OAuth2Credential.html
>>>
>>> Hope it helps,
>>> Paul
>>>
>>> On Thursday, August 25, 2016 at 10:54:35 PM UTC-4, Manh Tran wrote:
>>>>
>>>> It seem only read access_token from OAuth2Credential* credential.
>>>> Currently, I've credentials-key.json. Are there any way using
>>>> this credentials-key.json file to get access token from google's server.
>>>>
>>>> Thanks.
>>>>
>>>> On Friday, August 26, 2016 at 4:10:02 AM UTC+7, Paul Grosu wrote:
>>>>>
>>>>> Gladly :) Check out webflow_sample_main.cc example
>>>>> <https://github.com/google/google-api-cpp-client/blob/master/src/samples/webflow_sample_main.cc>
>>>>>
>>>>> on line 386
>>>>> <https://github.com/google/google-api-cpp-client/blob/master/src/samples/webflow_sample_main.cc#L386>
>>>>> :
>>>>>
>>>>> string new_access_token = credential->access_token().as_string();
>>>>>
>>>>> Hope it helps,
>>>>> ~p
>>>>>
>>>>>
>>>>> On Thursday, August 25, 2016 at 3:29:47 AM UTC-4, Manh Tran wrote:
>>>>>>
>>>>>> Could you show me detail using the Google APIs Client Library for C++?
>>>>>>
>>>>>> Thank you so much.
>>>>>>
>>>>>> On Thursday, August 25, 2016 at 12:16:13 PM UTC+7, Paul Grosu wrote:
>>>>>>>
>>>>>>>
>>>>>>> Of course :) You have two options:
>>>>>>>
>>>>>>> 1) Use the Google APIs Client Library for C++:
>>>>>>>
>>>>>>>
>>>>>>> https://google.github.io/google-api-cpp-client/latest/guide/oauth2.html
>>>>>>> <https://google.github.io/google-api-cpp-client/latest/guide/oauth2.html>
>>>>>>>
>>>>>>> 2) Or just use execve system call to run an external program to
>>>>>>> provide the token :)
>>>>>>>
>>>>>>> ~p
>>>>>>>
>>>>>>> On Thursday, August 25, 2016 at 1:05:08 AM UTC-4, Manh Tran wrote:
>>>>>>>>
>>>>>>>> Are there any way to get token within my C++ program?
>>>>>>>>
>>>>>>>> Thanks.
>>>>>>>> On Thursday, August 25, 2016 at 9:09:54 AM UTC+7, Nicolas Noble
>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> It depends on your platform. But basically, you need to use and
>>>>>>>>> authenticate with the gcloud command line tool, which will create the
>>>>>>>>> token
>>>>>>>>> for you that will be read by grpc automatically.
>>>>>>>>>
>>>>>>>>> See https://cloud.google.com/sdk/gcloud/reference/auth/login
>>>>>>>>> about how to do that.
>>>>>>>>>
>>>>>>>>> On Wed, Aug 24, 2016, 18:43 Manh Tran <[email protected]> wrote:
>>>>>>>>>
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> I'm writing a gRPC client connect to google cloud speech. I think
>>>>>>>>>> it needs an access token to connect to google cloud. Please tell me
>>>>>>>>>> how to
>>>>>>>>>> get an access token OAuth2 on gRPC C++.
>>>>>>>>>>
>>>>>>>>>> Thanks.
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> You received this message because you are subscribed to the
>>>>>>>>>> Google Groups "grpc.io" group.
>>>>>>>>>> To unsubscribe from this group and stop receiving emails from it,
>>>>>>>>>> send an email to [email protected].
>>>>>>>>>> To post to this group, send email to [email protected].
>>>>>>>>>> To view this discussion on the web visit
>>>>>>>>>> https://groups.google.com/d/msgid/grpc-io/25d7e7d5-8d67-4f0c-96bd-775a9397e4d4%40googlegroups.com
>>>>>>>>>>
>>>>>>>>>> <https://groups.google.com/d/msgid/grpc-io/25d7e7d5-8d67-4f0c-96bd-775a9397e4d4%40googlegroups.com?utm_medium=email&utm_source=footer>
>>>>>>>>>> .
>>>>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>>>>
>>>>>>>>>
--
You received this message because you are subscribed to the Google Groups
"grpc.io" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/grpc-io/e45939e7-f386-4ee9-8fa0-522ebaa35acb%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
