/**
* Service which provides helper methods for retrieving the avatars displayed in the app.
*/
export abstract class AvatarService {
* Retrieve URL for avatar image with given hash.
* @param hash Avatar image hash.
* @param size Avatar image size.
* @param notFound URL parameter if avatar image is not found.
* @return avatarURL The URL for the avatar image.
public abstract getAvatar(hash: string, size?: number, notFound?: string): string;
* Compute the avatar image hash.
* @param email Email for avatar user.
* @param name Username for avatar user.
* @return hash The hash for the avatar image.
public abstract computeHash(email?: string, name?: string): string;
}