OfficeIMO.GoogleWorkspace

Shared session, credential, retry, Drive-location, and translation-report primitives for the Google Workspace extension packages.

What this package provides

• IGoogleWorkspaceCredentialSource so applications can plug in their own OAuth or service-account token acquisition.
• StaticAccessTokenCredentialSource for scenarios where the app already has a Google access token.
• DelegateGoogleWorkspaceCredentialSource for plugging in an existing token service with a single delegate.
• GoogleServiceAccountCredentialSource for built-in service-account JWT bearer exchange, including domain-wide delegation via session options.
• GoogleWorkspaceSession as the shared runtime container for credentials and session defaults.
• GoogleWorkspaceSessionOptions for app identity, timeout, retry policy, and default Drive placement.
• GoogleDriveFileLocation for folder, shared-drive, and existing-file targeting.
• TranslationReport / TranslationNotice for export diagnostics, warnings, and retry visibility.
• GoogleWorkspaceExportException for failed exports that still preserve TranslationReport and a high-level failure category.
• GoogleWorkspaceExportCanceledException for caller-triggered cancellations that still preserve TranslationReport.
• ToDiagnosticEntries() helpers for turning reports and export exceptions into structured log-ready entries.
• GoogleWorkspaceSessionOptions.DiagnosticSink for streaming retry/auth/API diagnostics while an export is running.

Quick start

using OfficeIMO.GoogleWorkspace;

var session = new GoogleWorkspaceSession(
    new StaticAccessTokenCredentialSource("<google-access-token>"),
    new GoogleWorkspaceSessionOptions {
        ApplicationName = "OfficeIMO Samples",
        DefaultDriveId = "shared-drive-id",
        DefaultFolderId = "reports-folder-id",
        MaxRetryCount = 5,
        RetryBaseDelay = TimeSpan.FromMilliseconds(250),
        RetryMaxDelay = TimeSpan.FromSeconds(10),
        RequestTimeout = TimeSpan.FromSeconds(120),
    });

Service account JSON shortcut:

using OfficeIMO.GoogleWorkspace;

var sessionOptions = new GoogleWorkspaceSessionOptions {
    SubjectUser = "analyst@example.com",
    UseDomainWideDelegation = true,
    DefaultFolderId = "reports-folder-id",
};

var credentialSource = GoogleServiceAccountCredentialSource.FromFile(
    "service-account.json",
    sessionOptions);

var session = new GoogleWorkspaceSession(credentialSource, sessionOptions);

Handling failed exports:

try {
    var result = await document.ExportToGoogleDocsAsync(session, options);
    Console.WriteLine(result.WebViewLink);
} catch (GoogleWorkspaceExportException exception) {
    Console.WriteLine(exception.FailureKind);

    foreach (var notice in exception.Report.Notices) {
        Console.WriteLine($"{notice.Severity}: {notice.Feature} - {notice.Message}");
    }
} catch (GoogleWorkspaceExportCanceledException exception) {
    Console.WriteLine(exception.FailureKind);
}

Turning diagnostics into log-ready entries:

foreach (var entry in exception.ToDiagnosticEntries()) {
    Console.WriteLine($"{entry.Severity} {entry.Feature} {entry.FailureKind}: {entry.Message}");
}

Streaming diagnostics during export:

var session = new GoogleWorkspaceSession(
    credentialSource,
    new GoogleWorkspaceSessionOptions {
        DiagnosticSink = entry =>
            Console.WriteLine($"{entry.Severity} {entry.Feature} [{entry.FailureKind}]: {entry.Message}")
    });

Session options

• DefaultFolderId: used when exporter save options omit Location.FolderId.
• DefaultDriveId: used when exporter save options omit Location.DriveId.
• MaxRetryCount: retry budget for transient Google API failures.
• RetryBaseDelay: starting point for exponential backoff when no Retry-After header is present.
• RetryMaxDelay: cap for retry delays.
• RequestTimeout: shared HttpClient timeout for Google API requests.
• DiagnosticSink: optional callback for live retry, authentication, Drive-placement, and API failure diagnostics during export.
• SubjectUser and UseDomainWideDelegation: available for apps that implement delegated credential flows in their own IGoogleWorkspaceCredentialSource.
• SubjectUser and UseDomainWideDelegation: also consumed by GoogleServiceAccountCredentialSource for domain-wide delegation.

Notes

• GoogleServiceAccountCredentialSource currently relies on native PEM import support and is intended for modern runtimes such as net8.0 and net10.0. On older targets, acquire tokens externally and use StaticAccessTokenCredentialSource or DelegateGoogleWorkspaceCredentialSource.
• The package does not ship an interactive browser OAuth flow. Applications are expected to provide or integrate one through IGoogleWorkspaceCredentialSource, although StaticAccessTokenCredentialSource, DelegateGoogleWorkspaceCredentialSource, and GoogleServiceAccountCredentialSource cover common server-side and pre-issued-token scenarios.
• Exporters add ApiRetries notices to TranslationReport when an operation succeeds after transient Google API failures.
• Exporters throw GoogleWorkspaceExportException when token acquisition, Google API execution, or request timeout failures occur, so callers can inspect FailureKind and the captured TranslationReport.
• Exporters throw GoogleWorkspaceExportCanceledException when the caller cancels the export, preserving both cancellation semantics and the captured TranslationReport.
• Google API failures now prefer parsed Google JSON error details such as status and reason codes when those are available.
• Replacement flows can target an existing file by setting GoogleDriveFileLocation.ExistingFileId.

For concrete exporters, see OfficeIMO.Word.GoogleDocs and OfficeIMO.Excel.GoogleSheets.