Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::channel_v1::CloudChannelServiceClient(
google::cloud::channel_v1::MakeCloudChannelServiceConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-05 UTC."],[[["This document provides a version history and guide on overriding authentication credentials for Google Cloud services in C++."],["The latest release candidate is version 2.37.0-rc, with a history of versions going back to 2.11.0, all linking to channel override authentication documentation."],["The document details how to override default authentication credentials by using `UnifiedCredentialsOption`, specifically demonstrated by loading a service account key file."],["Links to example code snippets are provided for `channel_v1::CloudChannelServiceClient` and `channel_v1::CloudChannelReportsServiceClient` which demonstrates how to implement the override."],["It recommends reviewing the \"Best practices for managing service account keys\" and the \"Authentication Components\" documentation for more information."]]],[]]
