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::edgenetwork_v1::EdgeNetworkClient(
google::cloud::edgenetwork_v1::MakeEdgeNetworkConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, specifically within the context of the Edge Network service.\u003c/p\u003e\n"],["\u003cp\u003eThe latest version available is 2.37.0-rc, while a range of prior versions, from 2.36.0 down to 2.19.0, are also documented and accessible.\u003c/p\u003e\n"],["\u003cp\u003eBy default, the client libraries rely on Application Default Credentials (ADC) for authentication, but this can be overridden using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eThe provided code example demonstrates how to explicitly load a service account key file for authentication, although it is recommended to consult best practices for managing service account keys.\u003c/p\u003e\n"],["\u003cp\u003eFurther details on authentication components and factory functions for creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects can be found in the linked "Authentication Components" documentation.\u003c/p\u003e\n"]]],[],null,[]]
