fix(auth): respect server username in clients (#25596)

packages/opencode/src/server/auth.ts

@@ -0,0 +1,48 @@
+export * as ServerAuth from "./auth"
+
+import { ConfigService } from "@/effect/config-service"
+import { Flag } from "@opencode-ai/core/flag/flag"
+import { Config as EffectConfig, Context, Option, Redacted } from "effect"
+
+export type Credentials = {
+  password?: string
+  username?: string
+}
+
+export type DecodedCredentials = {
+  readonly username: string
+  readonly password: Redacted.Redacted
+}
+
+export class Config extends ConfigService.Service<Config>()("@opencode/ServerAuthConfig", {
+  password: EffectConfig.string("OPENCODE_SERVER_PASSWORD").pipe(EffectConfig.option),
+  username: EffectConfig.string("OPENCODE_SERVER_USERNAME").pipe(EffectConfig.withDefault("opencode")),
+}) {}
+
+export type Info = Context.Service.Shape<typeof Config>
+
+export function required(config: Info) {
+  return Option.isSome(config.password) && config.password.value !== ""
+}
+
+export function authorized(credentials: DecodedCredentials, config: Info) {
+  return (
+    Option.isSome(config.password) &&
+    credentials.username === config.username &&
+    Redacted.value(credentials.password) === config.password.value
+  )
+}
+
+export function header(credentials?: Credentials) {
+  const password = credentials?.password ?? Flag.OPENCODE_SERVER_PASSWORD
+  if (!password) return undefined
+
+  const username = credentials?.username ?? Flag.OPENCODE_SERVER_USERNAME ?? "opencode"
+  return `Basic ${Buffer.from(`${username}:${password}`).toString("base64")}`
+}
+
+export function headers(credentials?: Credentials) {
+  const authorization = header(credentials)
+  if (!authorization) return undefined
+  return { Authorization: authorization }
+}