S3 links

use s3.qweruse s3_download_url, s3_upload_url from s3      // Quillo 0.6: only these

rusty-s3 = "0.5"url = "2"

// Avatars uploaded by the browser straight to a bucket.////   S3_ENDPOINT=https://<account>.r2.cloudflarestorage.com S3_REGION=auto S3_BUCKET=avatars \//   S3_ACCESS_KEY=... S3_SECRET_KEY=... quillo run s3.qwe      then open http://localhost:8080/upload-linkuse "s3.qwer"route GET /upload-link {    let key = `avatars/${uuid()}.jpg`    { key, put: s3_upload_url(key, 300)?, get: s3_download_url(key, 3600)? }}

//! Signed links to S3, Cloudflare R2, MinIO, Backblaze or DigitalOcean Spaces: browsers upload and download directly, the server never holds the bytes.//! version: 1.0.0//!//! [dependencies]//! rusty-s3 = "0.5"//! url = "2"use rusty_s3::{Bucket, Credentials, S3Action, UrlStyle};use std::time::Duration;fn env(name: &str) -> Result<String, String> {    std::env::var(name).map_err(|_| format!("{} is not set (S3_ENDPOINT, S3_REGION, S3_BUCKET, S3_ACCESS_KEY, S3_SECRET_KEY)", name))}fn bucket() -> Result<(Bucket, Credentials), String> {    let endpoint = url::Url::parse(&env("S3_ENDPOINT")?).map_err(|e| e.to_string())?;    let style = if std::env::var("S3_VIRTUAL_HOSTS").is_ok() { UrlStyle::VirtualHost } else { UrlStyle::Path };    let b = Bucket::new(endpoint, style, env("S3_BUCKET")?, env("S3_REGION")?).map_err(|e| e.to_string())?;    Ok((b, Credentials::new(env("S3_ACCESS_KEY")?, env("S3_SECRET_KEY")?)))}fn secs(s: i64) -> Duration {    Duration::from_secs(s.clamp(1, 7 * 24 * 3600) as u64)}/// A link that downloads `key` for `seconds`: put it in an `<a>` or an `<img>`.pub fn s3_download_url(key: &str, seconds: i64) -> Result<String, String> {    let (b, c) = bucket()?;    Ok(b.get_object(Some(&c), key).sign(secs(seconds)).to_string())}/// A link the browser PUTs a file to, as `key`, for `seconds`: `fetch(url, { method: "PUT", body: file })`.pub fn s3_upload_url(key: &str, seconds: i64) -> Result<String, String> {    let (b, c) = bucket()?;    Ok(b.put_object(Some(&c), key).sign(secs(seconds)).to_string())}/// A link that deletes `key`, for `seconds`: call it from the server with `http.request`.pub fn s3_delete_url(key: &str, seconds: i64) -> Result<String, String> {    let (b, c) = bucket()?;    Ok(b.delete_object(Some(&c), key).sign(secs(seconds)).to_string())}