feat(server): add authenticated remote access and desktop bootstrap

Adds cookie-based login with a bootstrap token flow for desktop apps, secures OpenCode instance traffic with per-instance Basic auth, and updates UI/plugin clients to use credentials.

packages/server/src/auth/auth-store.ts

@@ -0,0 +1,175 @@
+import fs from "fs"
+import path from "path"
+import type { Logger } from "../logger"
+import { hashPassword, type PasswordHashRecord, verifyPassword } from "./password-hash"
+
+export interface AuthFile {
+  version: 1
+  username: string
+  password: PasswordHashRecord
+  userProvided: boolean
+  updatedAt: string
+}
+
+export interface AuthStatus {
+  username: string
+  passwordUserProvided: boolean
+}
+
+export class AuthStore {
+  private cachedFile: AuthFile | null = null
+  private overrideAuth: AuthFile | null = null
+  private bootstrapUsername: string | null = null
+
+  constructor(private readonly authFilePath: string, private readonly logger: Logger) {}
+
+  getAuthFilePath() {
+    return this.authFilePath
+  }
+
+  load(): AuthFile | null {
+    if (this.overrideAuth) {
+      return this.overrideAuth
+    }
+
+    if (this.cachedFile) {
+      return this.cachedFile
+    }
+
+    try {
+      if (!fs.existsSync(this.authFilePath)) {
+        return null
+      }
+      const raw = fs.readFileSync(this.authFilePath, "utf-8")
+      const parsed = JSON.parse(raw) as AuthFile
+      if (!parsed || parsed.version !== 1) {
+        this.logger.warn({ authFilePath: this.authFilePath }, "Auth file has unsupported version")
+        return null
+      }
+      this.cachedFile = parsed
+      return parsed
+    } catch (error) {
+      this.logger.warn({ err: error, authFilePath: this.authFilePath }, "Failed to load auth file")
+      return null
+    }
+  }
+
+  ensureInitialized(params: {
+    username: string
+    password?: string
+    allowBootstrapWithoutPassword: boolean
+  }): void {
+    const password = params.password?.trim()
+    if (password) {
+      const now = new Date().toISOString()
+      const runtime: AuthFile = {
+        version: 1,
+        username: params.username,
+        password: hashPassword(password),
+        userProvided: true,
+        updatedAt: now,
+      }
+      this.overrideAuth = runtime
+      this.cachedFile = null
+      this.bootstrapUsername = null
+      this.logger.debug({ authFilePath: this.authFilePath }, "Using runtime auth password override; ignoring auth file")
+      return
+    }
+
+    const existing = this.load()
+    if (existing) {
+      if (existing.username !== params.username) {
+        // Keep existing username unless explicitly overridden later.
+        this.logger.debug({ existing: existing.username, requested: params.username }, "Auth username differs from requested")
+      }
+      this.bootstrapUsername = null
+      return
+    }
+
+    if (params.allowBootstrapWithoutPassword) {
+      this.bootstrapUsername = params.username
+      this.logger.debug({ authFilePath: this.authFilePath }, "No auth file present; bootstrap-only mode enabled")
+      return
+    }
+
+    throw new Error(
+      `No server password configured. Create ${this.authFilePath} or start with --password / CODENOMAD_SERVER_PASSWORD.`,
+    )
+  }
+
+  validateCredentials(username: string, password: string): boolean {
+    const auth = this.load()
+    if (!auth) {
+      return false
+    }
+
+    if (username !== auth.username) {
+      return false
+    }
+
+    return verifyPassword(password, auth.password)
+  }
+
+  setPassword(params: { password: string; markUserProvided: boolean }): AuthStatus {
+    if (this.overrideAuth) {
+      throw new Error(
+        "Server password is provided via CLI/env and cannot be changed while running. Restart without --password / CODENOMAD_SERVER_PASSWORD to use auth.json.",
+      )
+    }
+
+    const current = this.load()
+
+    if (!current) {
+      if (!this.bootstrapUsername) {
+        throw new Error("Auth is not initialized")
+      }
+
+      const created: AuthFile = {
+        version: 1,
+        username: this.bootstrapUsername,
+        password: hashPassword(params.password),
+        userProvided: params.markUserProvided,
+        updatedAt: new Date().toISOString(),
+      }
+
+      this.persist(created)
+      this.bootstrapUsername = null
+      return { username: created.username, passwordUserProvided: created.userProvided }
+    }
+
+    const next: AuthFile = {
+      ...current,
+      password: hashPassword(params.password),
+      userProvided: params.markUserProvided,
+      updatedAt: new Date().toISOString(),
+    }
+
+    this.persist(next)
+    return { username: next.username, passwordUserProvided: next.userProvided }
+  }
+
+  getStatus(): AuthStatus {
+    const current = this.load()
+    if (current) {
+      return { username: current.username, passwordUserProvided: current.userProvided }
+    }
+
+    if (this.bootstrapUsername) {
+      return { username: this.bootstrapUsername, passwordUserProvided: false }
+    }
+
+    throw new Error("Auth is not initialized")
+  }
+
+  private persist(auth: AuthFile) {
+    try {
+      fs.mkdirSync(path.dirname(this.authFilePath), { recursive: true })
+      fs.writeFileSync(this.authFilePath, JSON.stringify(auth, null, 2), "utf-8")
+      this.cachedFile = auth
+      this.logger.debug({ authFilePath: this.authFilePath }, "Persisted auth file")
+    } catch (error) {
+      this.logger.error({ err: error, authFilePath: this.authFilePath }, "Failed to persist auth file")
+      throw error
+    }
+  }
+}