`route-translation`

Purpose

Translation table mapping every entry in PROVIDER_ROUTE_SURFACE (the canonical 9-route foundation surface) to the matching Better-Auth-native sub-path. The wrapper presents the canonical names outward while Better-Auth still drives the heavy lifting at its idiomatic paths (/sign-up/email, /sign-in/email, /oauth2/sign-in/:providerId, ...). Without this translation a host built on the foundation contracts would need to know Better-Auth-specific URLs — which would defeat the purpose of the abstract auth.provider capability.

Features

Single immutable map keyed by ProviderRouteName.
Carries both nativePath and nativeMethod so the wrapper can rewrite the request method too (some translations flip GET → POST).
buildNativeUrl helper rewrites the canonical request URL onto Better-Auth's base URL, resolving :provider / :token params and preserving the query string.

Usage: Basic

import { ROUTE_TRANSLATION, buildNativeUrl } from "@suaveplan/api-auth-better-auth";

const target = ROUTE_TRANSLATION.login;
// → { nativePath: "/sign-in/email", nativeMethod: "POST" }

const url = buildNativeUrl({
    baseUrl: "https://api.example.com",
    nativePath: target.nativePath,
    params: {},
    search: "redirect=/home",
});
// → URL { https://api.example.com/sign-in/email?redirect=/home }

Usage: Advanced

import { buildNativeUrl, ROUTE_TRANSLATION } from "@suaveplan/api-auth-better-auth";

// OAuth callback — the canonical `/oauth/:provider/callback?code=xxx&state=yyy`
// is rewritten to Better-Auth's `/oauth2/callback/:provider?...` surface.
const target = ROUTE_TRANSLATION["oauth.callback"];
const native = buildNativeUrl({
    baseUrl: "https://api.example.com",
    nativePath: target.nativePath,
    params: { provider: "github" },
    search: "code=xxx&state=yyy",
});
// → URL { https://api.example.com/oauth2/callback/github?code=xxx&state=yyy }

API Reference

Export	Shape	Purpose
`NativeRoute`	interface	`{ nativePath, nativeMethod }`
`ROUTE_TRANSLATION`	`Readonly<Record<ProviderRouteName, NativeRoute>>`	Canonical → native map
`buildNativeUrl(args)`	function	Rewrite the canonical URL onto Better-Auth's base URL

Implementation Notes

Object.freeze on the outer record + a Readonly<...> cast — but not on the inner entries because each entry is already a frozen literal authored inline. Decided against as const on the outer block so the indexed key narrowing stays type-friendly under noPropertyAccessFromIndexSignature. buildNativeUrl runs :param substitution before constructing the URL so malformed param values can't break out of the path; encodeURIComponent defends against / injection in the :provider slot. Query string preservation is critical for OAuth — the entire upstream callback payload (code, state, scope, …) needs to land on Better-Auth's handler verbatim.

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route-translation