Method getIDByEmail

backend/plugin/webhook/teams/app.go:205–242

getIDByEmail gets user AAD object ID by email using Microsoft Graph API. https://learn.microsoft.com/en-us/graph/api/user-get

(ctx context.Context, emails []string)

// getIDByEmail gets user AAD object ID by email using Microsoft Graph API.
// https://learn.microsoft.com/en-us/graph/api/user-get
func (p *provider) getIDByEmail(ctx context.Context, emails []string) (map[string]string, error) {
	userID := make(map[string]string)
	var emailsToGet []string

	for _, email := range emails {
		id, ok := userIDCache.Get(email)
		if ok {
			if id != "" {
				userID[email] = id
			}
		} else {
			emailsToGet = append(emailsToGet, email)
		}
	}

	if len(emailsToGet) == 0 {
		return userID, nil
	}

	if p.graphToken == "" {
		if err := p.refreshGraphToken(ctx); err != nil {
			return nil, errors.Wrapf(err, "failed to refresh graph token")
		}
	}

	for _, email := range emailsToGet {
		id, err := p.getUserIDByEmail(ctx, email)
		if err != nil {
			// Cache empty string for not found users to avoid repeated lookups.
			userIDCache.Add(email, "")
			continue
		}
		userID[email] = id
		userIDCache.Add(email, id)
	}

	return userID, nil
}

// usersResponse is the response from Microsoft Graph API for user list queries.
type usersResponse struct {