R2 Bucket Presign file in `R2Bucket` env file

[reinismu]

Describe the solution

Currently best practice to let user download large file from R2 is to presign URL and send it to user.

It would be very helpful if we had easy sign method here

declare abstract class R2Bucket {
    head(key: string): Promise<R2Object | null>;
    get(key: string, options: R2GetOptions & {
        onlyIf: R2Conditional | Headers;
    }): Promise<R2ObjectBody | R2Object | null>;
    get(key: string, options?: R2GetOptions): Promise<R2ObjectBody | null>;
    put(key: string, value: ReadableStream | ArrayBuffer | ArrayBufferView | string | null | Blob, options?: R2PutOptions & {
        onlyIf: R2Conditional | Headers;
    }): Promise<R2Object | null>;
    put(key: string, value: ReadableStream | ArrayBuffer | ArrayBufferView | string | null | Blob, options?: R2PutOptions): Promise<R2Object>;
    createMultipartUpload(key: string, options?: R2MultipartOptions): Promise<R2MultipartUpload>;
    resumeMultipartUpload(key: string, uploadId: string): R2MultipartUpload;
    delete(keys: string | string[]): Promise<void>;
    list(options?: R2ListOptions): Promise<R2Objects>;
}

Now from what I know to presign file we need to pass R2 access and secret key to worker.
I build my infrastructure with Pulumi and it is a pain to get them

[edmundhung]

Thanks for the suggestion. I have shared it internally and created R2-3566 to track it.