Homework/cs5260/consumer/dao/keys/S3WidgetKeyGenerator.ts


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import { WidgetT } from "@/shared/schema";

export class S3WidgetKeyGenerator {
  private prefix: string = "";
  private owner: string = "";
  private widgetId: string = "";

  public withPrefix(prefix: string): S3WidgetKeyGenerator {
    this.prefix = prefix;
    return this;
  }

  public withOwner(owner: string): S3WidgetKeyGenerator {
    this.owner = owner;
    return this;
  }

  public withWidgetId(widgetId: string): S3WidgetKeyGenerator {
    this.widgetId = widgetId;
    return this;
  }

  public build(): string {
    const parts = [
      this.prefix,
      this.owner.replaceAll(" ", "-").toLowerCase(),
      this.widgetId,
    ];
    if (parts.some((part) => !part || !part.match(/^[a-zA-Z0-9!\-_.*'()]+$/))) {
      throw new Error("Invalid Key Specification");
    }
    return parts.join("/");
  }

  public fromWidget(widget: WidgetT) {
    const keyBuilder = new S3WidgetKeyGenerator();
    return keyBuilder
      .withPrefix(this.prefix)
      .withOwner(widget.owner)
      .withWidgetId(widget.id)
      .build();
  }
}