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use anyhow::{anyhow, Context};use axum::extract::{Form, Path, State};use axum::response::{Html, IntoResponse, Redirect, Response};use axum::routing::post;use axum::Router;use chrono::{DateTime, Duration, Utc};use maud::{html, Markup};use serde::Deserialize;use sqlx::SqlitePool;
use crate::atproto::id::{AtUri, Did, Handle, Rkey};use crate::atproto::lexicon::mod_listing::MediaItem;use crate::atproto::lexicon::{ActorProfile, Found, ModListing, ModVersion, Record};use crate::atproto::pds;use crate::error::AppError;use crate::form;use crate::oauth::session::SessionCookie;use crate::page::Page;use crate::state::AppState;use crate::{blobs, deliverables, s3};
/// How long an offer waits for its recipient.const OFFER_DAYS: i64 = 30;
/// How long after an accept begins that it still counts as under way. One/// that began longer ago than this and never finished has failed.const ACCEPT_MINUTES: i64 = 15;
pub fn router() -> Router<AppState> { Router::new() .route("/{handle}/{slug}/transfer", post(handle_post_offer)) .route("/{handle}/{slug}/transfer/check", post(handle_post_check)) .route("/{handle}/{slug}/transfer/cancel", post(handle_post_cancel)) .route("/transfers/{id}/accept", post(handle_post_accept)) .route("/transfers/{id}/decline", post(handle_post_decline))}
/// A pending offer of one of the sender's mods, as the sender sees it.pub struct Outgoing { /// `@handle`, or the DID if the account has no handle. recipient: String, display_name: String, avatar_url: String, expires_at: DateTime<Utc>, /// Whether the recipient has started accepting, after which the offer /// can't be cancelled. accepting: bool, /// Whether an accept is under way, which makes the mod read-only until it /// finishes. pub in_progress: bool,}
/// The pending offer of `listing`, if there is one.pub async fn outgoing( state: &AppState, sender: &Did, listing: &Rkey,) -> anyhow::Result<Option<Outgoing>> { let row = sqlx::query!( r#"SELECT recipient_did, expires_at, new_rkey IS NOT NULL AS "accepting!: bool" FROM mod_transfer WHERE sender_did = ? AND listing_rkey = ? AND accepted_at IS NULL AND (new_rkey IS NOT NULL OR expires_at > strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))"#, sender, listing ) .fetch_optional(&state.db) .await?; let Some(row) = row else { return Ok(None); };
let recipient = Did::new(row.recipient_did); let profile = ActorProfile::load(&state.db, &recipient).await?; Ok(Some(Outgoing { recipient: display_name(state, &recipient).await?, display_name: profile.display_name.clone(), avatar_url: profile.avatar_url(&recipient, 128), expires_at: DateTime::parse_from_rfc3339(&row.expires_at)?.with_timezone(&Utc), accepting: row.accepting, in_progress: accept_in_progress(&state.db, sender, listing).await?, }))}
/// Whether `listing` is being copied to its new owner right now.async fn accept_in_progress(db: &SqlitePool, sender: &Did, listing: &Rkey) -> sqlx::Result<bool> { let window = format!("-{ACCEPT_MINUTES} minutes"); Ok(sqlx::query_scalar!( r#"SELECT 1 AS "in_progress!: i64" FROM mod_transfer WHERE sender_did = ? AND listing_rkey = ? AND accepted_at IS NULL AND accept_started_at > strftime('%Y-%m-%dT%H:%M:%fZ', 'now', ?)"#, sender, listing, window ) .fetch_optional(db) .await? .is_some())}
/// Fails if `listing` is being copied to its new owner, since a change made/// now would be missing from the copy.pub async fn ensure_not_transferring( state: &AppState, sender: &Did, listing: &Rkey,) -> Result<(), AppError> { if accept_in_progress(&state.db, sender, listing) .await .map_err(|err| AppError::Internal(err.into()))? { return Err(AppError::BadRequest( "This mod is being transferred, so it can't be changed".to_string(), )); } Ok(())}
/// How to name `did` to a person: `@handle`, or the DID if it has none.async fn display_name(state: &AppState, did: &Did) -> anyhow::Result<String> { Ok(match did.resolve_handle(state).await? { Some(handle) => format!("@{handle}"), None => did.to_string(), })}
/// Offers `listing` to `recipient`. Returns false if it's already offered to/// someone.async fn offer( db: &SqlitePool, sender: &Did, listing: &Rkey, slug: &str, recipient: &Did,) -> sqlx::Result<bool> { let mut tx = db.begin().await?; // An expired offer would otherwise hold the mod's one slot. sqlx::query!( "DELETE FROM mod_transfer WHERE new_rkey IS NULL AND expires_at <= strftime('%Y-%m-%dT%H:%M:%fZ', 'now')" ) .execute(&mut *tx) .await?; let expiry = format!("+{OFFER_DAYS} days"); let inserted = sqlx::query!( "INSERT INTO mod_transfer (sender_did, listing_rkey, slug, recipient_did, created_at, expires_at) VALUES (?, ?, ?, ?, strftime('%Y-%m-%dT%H:%M:%fZ', 'now'), strftime('%Y-%m-%dT%H:%M:%fZ', 'now', ?)) ON CONFLICT (sender_did, listing_rkey) DO NOTHING", sender, listing, slug, recipient, expiry ) .execute(&mut *tx) .await? .rows_affected(); tx.commit().await?; Ok(inserted == 1)}
/// What the settings tab shows in place of its forms while the recipient's/// accept is copying the mod. It polls, and leaves once the accept ends:/// for the mod's new address if it finished, or the settings if it failed.pub fn progress(existing: &Found<ModListing>, outgoing: &Outgoing) -> Markup { let settings = settings_path(existing); html! { div.transfer-progress role="status" hx-get=(settings) hx-trigger="every 3s" hx-target="#mod-details" hx-select="#mod-details" hx-swap="outerHTML" hx-on::response-error={ "window.location.href = '/" (existing.handle) "/" (existing.record.slug) "'" } { span.spinner aria-hidden="true" {} p.transfer-progress-heading { "Transferring to" } (recipient_chip(&outgoing.avatar_url, &outgoing.display_name, &outgoing.recipient)) } }}
/// An account's avatar and names, as `account` (`@handle`) with its display/// name above it if it has one.fn recipient_chip(avatar_url: &str, display_name: &str, account: &str) -> Markup { html! { div.transfer-recipient { img.transfer-avatar src=(avatar_url) alt=""; @if display_name.is_empty() { strong { (account) } } @else { span.transfer-recipient-names { strong { (display_name) } span.transfer-recipient-handle { (account) } } } } }}
/// The transfer section of a mod's settings: a button to offer it, or the/// offer already pending and a button to cancel it.pub fn section(existing: &Found<ModListing>, outgoing: Option<&Outgoing>) -> Markup { let base = format!("/{}/{}", existing.handle, existing.record.slug); html! { div.centered { @match outgoing { Some(outgoing) if outgoing.accepting => { p { (outgoing.recipient) " is accepting this mod." } } Some(outgoing) => { p { "Waiting for " (outgoing.recipient) " to accept this mod. The offer expires on " (outgoing.expires_at.format("%-d %B %Y")) "." } form method="post" action={ (base) "/transfer/cancel" } { button.accent-red type="submit" { "Cancel transfer" } } } None => { div.label { label { "Want someone else to look after this mod?" } } button.button type="button" onclick="document.getElementById('transfer-dialog').showModal()" { "Transfer" } dialog.upload-dialog id="transfer-dialog" aria-labelledby="transfer-dialog-title" { h2 id="transfer-dialog-title" { "Transfer this mod" } (find_form(&base, "", None, None)) } } } } }}
/// An account found by handle, to confirm before offering it a mod.struct Recipient { did: Did, handle: Handle, display_name: String, avatar_url: String,}
/// The dialog's contents: a handle to look up and, once one is found, the/// account it belongs to and a button to offer it the mod.fn find_form( base: &str, value: &str, error: Option<&str>, recipient: Option<&Recipient>,) -> Markup { html! { div id="transfer-find" { form method="post" action={ (base) "/transfer/check" } hx-post={ (base) "/transfer/check" } hx-target="#transfer-find" hx-swap="outerHTML" novalidate { p { "The account you transfer this mod to gets its versions and downloads too, " "and you can no longer edit it." } (form::text_field( "recipient", "Handle", value, Some(html! { "For example, alice.bsky.social." }), error, )) div.form-actions { button.button.secondary type="submit" { "Find account" } button.secondary type="button" onclick="this.closest('dialog').close()" { "Cancel" } } } @if let Some(recipient) = recipient { form method="post" action={ (base) "/transfer" } { input type="hidden" name="recipient" value=(recipient.did); (recipient_chip(&recipient.avatar_url, &recipient.display_name, &format!("@{}", recipient.handle))) div.form-actions { button.button type="submit" { "Transfer to @" (recipient.handle) } } } } } }}
/// Finds the account a handle typed into the dialog belongs to, or says why/// it can't have the mod.async fn find_recipient( state: &AppState, sender: &Did, value: &str,) -> Result<Recipient, &'static str> { let value = value.trim(); if value.is_empty() { return Err("Enter a handle"); } let handle = Handle::new(value).map_err(|_| "Enter a handle in the correct format")?; let did = match handle.resolve_did(state).await { Ok(Some(did)) => did, Ok(None) => return Err("Handle must belong to an existing account"), Err(err) => { eprintln!("failed to resolve {handle} for a transfer: {err:?}"); return Err("The handle could not be checked - try again"); } }; if &did == sender { return Err("Enter the handle of another account"); } let profile = ActorProfile::load(&state.db, &did).await.map_err(|err| { eprintln!("failed to load {did}'s profile for a transfer: {err:?}"); "The handle could not be checked - try again" })?; Ok(Recipient { avatar_url: profile.avatar_url(&did, 128), display_name: profile.display_name, did, handle, })}
#[derive(Deserialize)]struct RecipientForm { recipient: String,}
/// `POST /{handle}/{slug}/transfer/check` -- looks up the handle typed into/// the transfer dialog, and shows whose account it is.async fn handle_post_check( existing: Found<ModListing>, Form(form): Form<RecipientForm>,) -> Result<Html<String>, AppError> { let session = existing.owner_session()?; let base = format!("/{}/{}", existing.handle, existing.record.slug); let markup = match find_recipient(existing.state(), &session.did, &form.recipient).await { Ok(recipient) => find_form(&base, &form.recipient, None, Some(&recipient)), Err(error) => find_form(&base, &form.recipient, Some(error), None), }; Ok(Html(markup.into_string()))}
/// `POST /{handle}/{slug}/transfer` -- offers the mod to the account the/// dialog found.async fn handle_post_offer( existing: Found<ModListing>, Form(form): Form<RecipientForm>,) -> Result<Response, AppError> { let session = existing.owner_session()?; let recipient = Did::new(form.recipient); if recipient == session.did || !recipient.as_str().starts_with("did:") { return Err(AppError::BadRequest( "Enter the handle of another account".to_string(), )); } offer( &existing.state().db, &existing.did, &existing.rkey, &existing.record.slug, &recipient, ) .await .map_err(|err| AppError::Internal(err.into()))?; Ok(Redirect::to(&settings_path(&existing)).into_response())}
/// `POST /{handle}/{slug}/transfer/cancel` -- withdraws an offer nobody has/// started accepting.async fn handle_post_cancel(existing: Found<ModListing>) -> Result<Response, AppError> { existing.owner_session()?; sqlx::query!( "DELETE FROM mod_transfer WHERE sender_did = ? AND listing_rkey = ? AND new_rkey IS NULL", existing.did, existing.rkey ) .execute(&existing.state().db) .await .map_err(|err| AppError::Internal(err.into()))?; Ok(Redirect::to(&settings_path(&existing)).into_response())}
fn settings_path(existing: &Found<ModListing>) -> String { format!("/{}/{}/settings", existing.handle, existing.record.slug)}
/// `POST /transfers/{id}/decline` -- refuses an offer, which forgets it.async fn handle_post_decline( State(state): State<AppState>, session: SessionCookie, Path(id): Path<i64>,) -> Result<Response, AppError> { sqlx::query!( "DELETE FROM mod_transfer WHERE id = ? AND recipient_did = ? AND new_rkey IS NULL", id, session.did ) .execute(&state.db) .await .map_err(|err| AppError::Internal(err.into()))?; Ok(Redirect::to("/").into_response())}
/// `POST /transfers/{id}/accept` -- moves the mod into the signed-in/// recipient's repo.async fn handle_post_accept( State(state): State<AppState>, session: SessionCookie, page: Page, Path(id): Path<i64>,) -> Result<Response, AppError> { let accepted = match accept(&state, &session, id).await { Ok(accepted) => accepted, Err(AppError::Internal(err)) => { eprintln!("failed to accept transfer {id}: {err:?}"); return Ok(page .body(html! { main.form-page { h1 { "The mod could not be transferred" } p { "Something went wrong on our end. Select Accept to try again." } } }) .title("Transfer failed") .render() .into_response()); } Err(err) => return Err(err), };
let handle = session .did .resolve_handle(&state) .await? .ok_or_else(|| AppError::Internal(anyhow!("session has no resolvable handle")))?; let path = format!("/{handle}/{}", accepted.slug); if accepted.slug == accepted.old_slug { return Ok(Redirect::to(&path).into_response()); } Ok(page .body(html! { main.form-page { h1 { (accepted.title) " is yours" } p { "You already had a mod at /" (handle) "/" (accepted.old_slug) ", so this one is at " a href=(path) { (path) } "." } } }) .title("Mod transferred") .render() .into_response())}
/// A finished transfer: where the mod is now, and where it was.struct Accepted { title: String, slug: String, old_slug: String,}
/// Copies an offered mod into the recipient's repo, then hides the original.////// Safe to run again after failing partway: the copy's rkeys and object keys/// are recorded before anything is written to them, so a retry writes over/// the same records and objects rather than making new ones. The original/// stays listed until the copy is complete, so the mod always has an owner.async fn accept(state: &AppState, session: &SessionCookie, id: i64) -> Result<Accepted, AppError> { let recipient = &session.did; let transfer = sqlx::query!( "SELECT sender_did, listing_rkey FROM mod_transfer WHERE id = ? AND recipient_did = ? AND accepted_at IS NULL AND (new_rkey IS NOT NULL OR expires_at > strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))", id, recipient ) .fetch_optional(&state.db) .await .map_err(|err| AppError::Internal(err.into()))? .ok_or_else(|| AppError::BadRequest("The offer was cancelled or has expired".to_string()))?; let sender = Did::new(transfer.sender_did); let old_rkey = Rkey::from_verified(transfer.listing_rkey); sqlx::query!( "UPDATE mod_transfer SET accept_started_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now') WHERE id = ?", id ) .execute(&state.db) .await .map_err(|err| AppError::Internal(err.into()))?;
let Some(original) = ModListing::load_local(&state.db, &sender, &old_rkey).await? else { sqlx::query!("DELETE FROM mod_transfer WHERE id = ?", id) .execute(&state.db) .await .map_err(|err| AppError::Internal(err.into()))?; return Err(AppError::BadRequest( "The mod can't be transferred, because its owner deleted it".to_string(), )); };
let (new_rkey, new_slug) = destination(&state.db, id, recipient, &original.slug).await?;
// The same image uploaded twice is the same blob, so a retry costs a // transfer but makes nothing new. let mut media = Vec::with_capacity(original.media.len()); for item in &original.media { let Some(file) = item.file() else { media.push(item.clone()); continue; }; let blob = &file.inner; let (_, bytes) = blobs::fetch(state, sender.as_str(), &blob.ref_.link) .await? .ok_or_else(|| anyhow!("{sender}'s blob {} is gone", blob.ref_.link))?; let file = pds::upload_blob(state, session, bytes, &blob.mime_type).await?; media.push(MediaItem::Image { file, alt: item.alt().map(str::to_string), }); } let copy = ModListing { slug: new_slug.clone(), media, ..original.clone() }; copy.update(state, session, &new_rkey).await?;
// Oldest first, so the copies' rkeys, minted in this order, sort the // same way the originals did. let mut versions = ModVersion::find_by_mod(&state.db, &sender, &old_rkey).await?; versions.reverse(); for (old_version, version) in versions { copy_version( state, session, id, &sender, &new_rkey, &old_version, version, ) .await?; }
// One transaction, so the mod is never listed twice or not at all. let result: sqlx::Result<()> = async { let mut tx = state.db.begin().await?; sqlx::query!( "UPDATE mod_transfer SET accepted_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now') WHERE id = ?", id ) .execute(&mut *tx) .await?; sqlx::query!( "DELETE FROM mod_listing WHERE author_did = ? AND rkey = ?", sender, old_rkey ) .execute(&mut *tx) .await?; sqlx::query!( "DELETE FROM mod_version WHERE mod_did = ? AND mod_rkey = ?", sender, old_rkey ) .execute(&mut *tx) .await?; sqlx::query!( "DELETE FROM mod_search WHERE author_did = ? AND rkey = ?", sender, old_rkey ) .execute(&mut *tx) .await?; // The mod is as popular as it was. `WHERE true` tells SQLite the // ON CONFLICT is the upsert's, not a join's. sqlx::query!( "INSERT INTO mod_stats_day (mod_did, mod_rkey, day, downloads, views) SELECT ?, ?, day, downloads, views FROM mod_stats_day WHERE mod_did = ? AND mod_rkey = ? AND true ON CONFLICT (mod_did, mod_rkey, day) DO UPDATE SET downloads = downloads + excluded.downloads, views = views + excluded.views", recipient, new_rkey, sender, old_rkey ) .execute(&mut *tx) .await?; sqlx::query!( "DELETE FROM mod_stats_day WHERE mod_did = ? AND mod_rkey = ?", sender, old_rkey ) .execute(&mut *tx) .await?; // Stars name the original, in their authors' repos, which only they // can change. Here, they count for the copy. sqlx::query!( "UPDATE OR IGNORE mod_star SET mod_did = ?, mod_rkey = ? WHERE mod_did = ? AND mod_rkey = ?", recipient, new_rkey, sender, old_rkey ) .execute(&mut *tx) .await?; sqlx::query!( "UPDATE featured_mod SET mod_did = ?, mod_rkey = ? WHERE mod_did = ? AND mod_rkey = ?", recipient, new_rkey, sender, old_rkey ) .execute(&mut *tx) .await?; tx.commit().await } .await; result.map_err(|err| AppError::Internal(err.into()))?;
Ok(Accepted { title: original.title, slug: new_slug, old_slug: original.slug, })}
/// Where transfer `id` copies its listing to in `recipient`'s repo: chosen/// the first time it's accepted, and the same on every retry.async fn destination( db: &SqlitePool, id: i64, recipient: &Did, slug: &str,) -> anyhow::Result<(Rkey, String)> { let rkey = Rkey::new(); let slug = free_slug(db, recipient, slug).await?; sqlx::query!( "UPDATE mod_transfer SET new_rkey = ?, new_slug = ? WHERE id = ? AND new_rkey IS NULL", rkey, slug, id ) .execute(db) .await?;
let row = sqlx::query!( r#"SELECT new_rkey AS "new_rkey!", new_slug AS "new_slug!" FROM mod_transfer WHERE id = ?"#, id ) .fetch_one(db) .await?; Ok((Rkey::from_verified(row.new_rkey), row.new_slug))}
/// `slug`, or the first of `slug-2`, `slug-3`, and so on that `did` has no/// mod at.async fn free_slug(db: &SqlitePool, did: &Did, slug: &str) -> anyhow::Result<String> { for n in 1.. { let candidate = suffixed(slug, n); let taken = sqlx::query_scalar!( r#"SELECT 1 AS "taken!: i64" FROM mod_listing WHERE author_did = ? AND slug = ?"#, did, candidate ) .fetch_optional(db) .await?; if taken.is_none() { return Ok(candidate); } } unreachable!("the loop above only ends by returning")}
/// The `n`th choice of slug: `slug` itself, then `slug-n`, shortened to fit/// the lexicon's 64 bytes.fn suffixed(slug: &str, n: u32) -> String { if n == 1 { return slug.to_string(); } let suffix = format!("-{n}"); let mut base = slug.to_string(); while base.len() + suffix.len() > 64 { base.pop(); } format!("{}{suffix}", base.trim_end_matches('-'))}
/// Copies one version, and its deliverable, onto the copy of its listing.async fn copy_version( state: &AppState, session: &SessionCookie, id: i64, sender: &Did, new_listing: &Rkey, old_rkey: &Rkey, version: ModVersion,) -> anyhow::Result<()> { let recipient = &session.did; let old_key = sqlx::query_scalar!( "SELECT object_key FROM deliverable WHERE author_did = ? AND version_rkey = ?", sender, old_rkey ) .fetch_optional(&state.db) .await?;
let new_rkey = Rkey::new(); let new_key = old_key.as_deref().map(|key| { let filename = key.rsplit('/').next().unwrap_or(key); s3::new_key(recipient, new_listing, filename) }); sqlx::query!( "INSERT INTO mod_transfer_version (transfer_id, old_rkey, new_rkey, new_object_key) VALUES (?, ?, ?, ?) ON CONFLICT (transfer_id, old_rkey) DO NOTHING", id, old_rkey, new_rkey, new_key ) .execute(&state.db) .await?; let row = sqlx::query!( "SELECT new_rkey, new_object_key FROM mod_transfer_version WHERE transfer_id = ? AND old_rkey = ?", id, old_rkey ) .fetch_one(&state.db) .await?; let new_rkey = Rkey::from_verified(row.new_rkey);
let deliverable = match (old_key, row.new_object_key) { (Some(old_key), Some(new_key)) => { state.s3.copy(&old_key, &new_key).await?; deliverables::record_checked(&state.db, &new_key, recipient, new_listing, &new_rkey) .await?; format!( "{}{}", state.config.external_base(), deliverables::download_path(recipient, new_listing, &new_rkey) ) } // Not one of ours, so it's already somewhere anyone can get it. _ => version.deliverable.clone(), };
let copy = ModVersion { listing: AtUri::new(recipient.clone(), ModListing::NSID, new_listing.clone()), deliverable, ..version }; copy.update(state, session, &new_rkey) .await .map_err(|err| match err { crate::atproto::lexicon::WriteError::Invalid(err) | crate::atproto::lexicon::WriteError::Failed(err) => err, }) .with_context(|| format!("failed to copy {sender}'s version {old_rkey}"))}
/// Whether `did`'s listing at `rkey` was transferred away, so it must not be/// listed again even while it's still in their repo.pub async fn is_moved(db: &SqlitePool, did: &Did, rkey: &Rkey) -> anyhow::Result<bool> { let moved = sqlx::query_scalar!( r#"SELECT 1 AS "moved!: i64" FROM mod_transfer WHERE sender_did = ? AND listing_rkey = ? AND accepted_at IS NOT NULL"#, did, rkey ) .fetch_optional(db) .await?; Ok(moved.is_some())}
/// Where the mod `did` had at `slug` went: its new owner and slug.pub async fn moved_listing( db: &SqlitePool, did: &Did, slug: &str,) -> anyhow::Result<Option<(Did, String)>> { let row = sqlx::query!( r#"SELECT recipient_did, new_slug AS "new_slug!" FROM mod_transfer WHERE sender_did = ? AND slug = ? AND accepted_at IS NOT NULL ORDER BY accepted_at DESC LIMIT 1"#, did, slug ) .fetch_optional(db) .await?; Ok(row.map(|row| (Did::new(row.recipient_did), row.new_slug)))}
/// Where a transferred version's copy downloads from.pub async fn moved_version( db: &SqlitePool, did: &Did, listing: &Rkey, version: &Rkey,) -> anyhow::Result<Option<String>> { let row = sqlx::query!( r#"SELECT t.recipient_did, t.new_rkey AS "new_listing!", v.new_rkey AS new_version FROM mod_transfer t JOIN mod_transfer_version v ON v.transfer_id = t.id WHERE t.sender_did = ? AND t.listing_rkey = ? AND v.old_rkey = ? AND t.accepted_at IS NOT NULL"#, did, listing, version ) .fetch_optional(db) .await?; Ok(row.map(|row| { deliverables::download_path( &Did::new(row.recipient_did), &Rkey::from_verified(row.new_listing), &Rkey::from_verified(row.new_version), ) }))}
/// An offer to show its recipient.pub struct Banner { id: i64, sender: String, title: String, /// Whether accepting it started and failed partway, so it can only be /// tried again. accepting: bool,}
/// The offers waiting for `recipient`.pub async fn banners(state: &AppState, recipient: &Did) -> anyhow::Result<Vec<Banner>> { let rows = sqlx::query!( r#"SELECT t.id AS "id!", t.sender_did, l.title, t.new_rkey IS NOT NULL AS "accepting!: bool" FROM mod_transfer t JOIN mod_listing l ON l.author_did = t.sender_did AND l.rkey = t.listing_rkey WHERE t.recipient_did = ? AND t.accepted_at IS NULL AND (t.new_rkey IS NOT NULL OR t.expires_at > strftime('%Y-%m-%dT%H:%M:%fZ', 'now')) ORDER BY t.id"#, recipient ) .fetch_all(&state.db) .await?;
let mut banners = Vec::with_capacity(rows.len()); for row in rows { banners.push(Banner { id: row.id, sender: display_name(state, &Did::new(row.sender_did)).await?, title: row.title, accepting: row.accepting, }); } Ok(banners)}
pub fn render_banners(banners: &[Banner]) -> Markup { html! { @if !banners.is_empty() { ul.transfer-offers.accent-blue aria-label="Mods offered to you" { @for banner in banners { li { span { (banner.sender) " has requested to transfer " strong { (banner.title) } " to you" } form method="post" action={ "/transfers/" (banner.id) "/accept" } { button.button type="submit" { "Accept" } } @if !banner.accepting { form method="post" action={ "/transfers/" (banner.id) "/decline" } { button.secondary type="submit" { "Decline" } } } } } } } }}
/// Whether `sender` has transferred mods whose originals are still in their/// repo.pub async fn has_originals(db: &SqlitePool, sender: &Did) -> sqlx::Result<bool> { let pending = sqlx::query_scalar!( r#"SELECT 1 AS "pending!: i64" FROM mod_transfer WHERE sender_did = ? AND accepted_at IS NOT NULL AND originals_deleted_at IS NULL LIMIT 1"#, sender ) .fetch_optional(db) .await?; Ok(pending.is_some())}
/// Deletes the originals of the mods `session`'s account transferred away,/// from their repo and the bucket. Each is marked done only once all of it/// is gone, so a failure is retried the next time they visit.pub async fn delete_originals(state: &AppState, session: &SessionCookie) -> anyhow::Result<()> { let sender = &session.did; let transfers = sqlx::query!( r#"SELECT id AS "id!", listing_rkey FROM mod_transfer WHERE sender_did = ? AND accepted_at IS NOT NULL AND originals_deleted_at IS NULL"#, sender ) .fetch_all(&state.db) .await?;
for transfer in transfers { let versions = sqlx::query_scalar!( "SELECT old_rkey FROM mod_transfer_version WHERE transfer_id = ?", transfer.id ) .fetch_all(&state.db) .await?; for version in versions { pds::delete(state, session, ModVersion::NSID, &version).await?; } pds::delete(state, session, ModListing::NSID, &transfer.listing_rkey).await?;
let listing = Rkey::from_verified(transfer.listing_rkey); let prefix = format!("{sender}/{listing}/"); state.s3.delete_prefix(&prefix).await?; sqlx::query!( "DELETE FROM deliverable WHERE author_did = ? AND mod_rkey = ?", sender, listing ) .execute(&state.db) .await?;
sqlx::query!( "UPDATE mod_transfer SET originals_deleted_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now') WHERE id = ?", transfer.id ) .execute(&state.db) .await?; } Ok(())}
/// Starts deleting the originals of `session`'s transferred mods, if any/// are left and its token will last long enough to.pub async fn spawn_delete_originals(state: &AppState, session: SessionCookie) { if session.expires_within(Duration::minutes(1)) { return; } match has_originals(&state.db, &session.did).await { Ok(false) => {} Ok(true) => { let state = state.clone(); tokio::spawn(async move { if let Err(err) = delete_originals(&state, &session).await { eprintln!( "failed to delete {}'s transferred originals: {err:?}", session.did ); } }); } Err(err) => eprintln!( "failed to check {} for transferred originals: {err:?}", session.did ), }}
#[cfg(test)]mod tests { use super::*;
async fn test_db() -> SqlitePool { let db = SqlitePool::connect("sqlite::memory:").await.unwrap(); sqlx::migrate!().run(&db).await.unwrap(); db }
#[test] fn a_taken_slug_gets_a_number_and_still_fits() { assert_eq!(suffixed("master-quest", 1), "master-quest"); assert_eq!(suffixed("master-quest", 2), "master-quest-2");
let long = "a".repeat(64); let shortened = suffixed(&long, 12); assert_eq!(shortened.len(), 64); assert!(shortened.ends_with("a-12")); }
#[tokio::test] async fn a_mod_can_only_be_offered_to_one_account_at_a_time() { let db = test_db().await; let sender = Did::new("did:plc:sender"); let listing = Rkey::new();
assert!( offer(&db, &sender, &listing, "mq", &Did::new("did:plc:bob")) .await .unwrap() ); assert!( !offer(&db, &sender, &listing, "mq", &Did::new("did:plc:carol")) .await .unwrap() ); }
#[tokio::test] async fn an_expired_offer_makes_way_for_a_new_one() { let db = test_db().await; let sender = Did::new("did:plc:sender"); let listing = Rkey::new();
offer(&db, &sender, &listing, "mq", &Did::new("did:plc:bob")) .await .unwrap(); sqlx::query("UPDATE mod_transfer SET expires_at = '2000-01-01T00:00:00.000Z'") .execute(&db) .await .unwrap();
assert!( offer(&db, &sender, &listing, "mq", &Did::new("did:plc:carol")) .await .unwrap() ); let recipient: String = sqlx::query_scalar("SELECT recipient_did FROM mod_transfer") .fetch_one(&db) .await .unwrap(); assert_eq!(recipient, "did:plc:carol"); }
#[tokio::test] async fn an_accept_that_began_long_ago_no_longer_locks_the_mod() { let db = test_db().await; let sender = Did::new("did:plc:sender"); let listing = Rkey::new(); offer(&db, &sender, &listing, "mq", &Did::new("did:plc:bob")) .await .unwrap(); assert!(!accept_in_progress(&db, &sender, &listing).await.unwrap());
sqlx::query( "UPDATE mod_transfer SET accept_started_at = strftime('%Y-%m-%dT%H:%M:%fZ', 'now')", ) .execute(&db) .await .unwrap(); assert!(accept_in_progress(&db, &sender, &listing).await.unwrap());
sqlx::query("UPDATE mod_transfer SET accept_started_at = '2000-01-01T00:00:00.000Z'") .execute(&db) .await .unwrap(); assert!(!accept_in_progress(&db, &sender, &listing).await.unwrap()); }
#[tokio::test] async fn the_destination_is_chosen_once_and_skips_taken_slugs() { let db = test_db().await; let sender = Did::new("did:plc:sender"); let recipient = Did::new("did:plc:bob"); offer(&db, &sender, &Rkey::new(), "mq", &recipient) .await .unwrap(); let id: i64 = sqlx::query_scalar("SELECT id FROM mod_transfer") .fetch_one(&db) .await .unwrap(); sqlx::query( "INSERT INTO mod_listing (author_did, rkey, title, slug, description, game, created_at) VALUES ('did:plc:bob', '3kaaa', 'Mine', 'mq', '', '64', '2026-01-01T00:00:00Z')", ) .execute(&db) .await .unwrap();
let first = destination(&db, id, &recipient, "mq").await.unwrap(); assert_eq!(first.1, "mq-2"); let retried = destination(&db, id, &recipient, "mq").await.unwrap(); assert_eq!(retried, first); }
#[tokio::test] async fn only_an_accepted_transfer_moves_the_old_address() { let db = test_db().await; let sender = Did::new("did:plc:sender"); let recipient = Did::new("did:plc:bob"); let listing = Rkey::new(); offer(&db, &sender, &listing, "mq", &recipient) .await .unwrap(); let id: i64 = sqlx::query_scalar("SELECT id FROM mod_transfer") .fetch_one(&db) .await .unwrap(); destination(&db, id, &recipient, "mq").await.unwrap();
assert!(!is_moved(&db, &sender, &listing).await.unwrap()); assert!(moved_listing(&db, &sender, "mq").await.unwrap().is_none());
sqlx::query("UPDATE mod_transfer SET accepted_at = '2026-10-11T00:00:00.000Z'") .execute(&db) .await .unwrap(); assert!(is_moved(&db, &sender, &listing).await.unwrap()); assert_eq!( moved_listing(&db, &sender, "mq").await.unwrap(), Some((recipient, "mq".to_string())) ); }}