# OpenCode Module Documentation

## Purpose
This module provides OpenCode server integration utilities for the web server runtime, including configuration management and provider authentication.

## Entrypoints and structure
- `packages/web/server/lib/opencode/index.js`: public entrypoint (currently baseline placeholder).
- `packages/web/server/lib/opencode/auth.js`: provider authentication file operations.
- `packages/web/server/lib/opencode/auth-state-runtime.js`: managed OpenCode server auth password/header runtime.
- `packages/web/server/lib/opencode/cli-options.js`: CLI/environment option parsing for server startup arguments.
- `packages/web/server/lib/opencode/cli-entry-runtime.js`: CLI entrypoint runtime that detects direct execution, parses CLI options, and starts server bootstrap.
- `packages/web/server/lib/opencode/routes.js`: OpenCode/provider settings and auth-related route registration.
- `packages/web/server/lib/opencode/lifecycle.js`: OpenCode process lifecycle runtime (startup, restart, readiness, health monitoring).
- `packages/web/server/lib/opencode/env-runtime.js`: OpenCode CLI/binary resolution and shell environment runtime.
- `packages/web/server/lib/opencode/env-config.js`: OpenCode-related environment variable parsing and validation (host/port/hostname).
- `packages/web/server/lib/opencode/hmr-state-runtime.js`: HMR-persistent runtime state initialization, auth-state bootstrap, and HMR sync helpers.
- `packages/web/server/lib/opencode/bootstrap-runtime.js`: base app bootstrap runtime for status/auth/tts/notification/OpenChamber route wiring.
- `packages/web/server/lib/opencode/network-runtime.js`: OpenCode URL construction, health-probe readiness checks, and API prefix runtime.
- `packages/web/server/lib/opencode/project-directory-runtime.js`: request-scoped and settings-backed project directory resolution/validation runtime.
- `packages/web/server/lib/opencode/config-entity-routes.js`: route registration for agent/command/MCP config orchestration and reload semantics.
- `packages/web/server/lib/opencode/cli-options.js`: CLI/environment option parsing for server startup arguments.
- `packages/web/server/lib/opencode/core-routes.js`: server status/system routes, auth/access guard routes, and settings utility route registration.
- `packages/web/server/lib/opencode/shutdown-runtime.js`: graceful shutdown orchestration runtime for watcher/session/terminal/process/server teardown.
- `packages/web/server/lib/opencode/server-startup-runtime.js`: server listen/startup tunnel flow and process/signal handler orchestration runtime.
- `packages/web/server/lib/opencode/static-routes-runtime.js`: static asset/SPA fallback route registration and manifest route wiring.
- `packages/web/server/lib/opencode/feature-routes-runtime.js`: feature route composition runtime for dynamic import-backed config/skill/provider route registration.
- `packages/web/server/lib/opencode/opencode-resolution-runtime.js`: OpenCode binary resolution snapshot runtime for settings routes and diagnostics.
- `packages/web/server/lib/opencode/tunnel-wiring-runtime.js`: tunnel service/routes composition runtime and active-port wiring for main server startup.
- `packages/web/server/lib/opencode/startup-pipeline-runtime.js`: server startup tail orchestration runtime for terminal/proxy/static/start-listen flow.
- `packages/web/server/lib/opencode/server-utils-runtime.js`: shared server runtime utilities for OpenCode proxy wiring, OpenCode port/readiness helpers, and snapshot fetchers.
- `packages/web/server/lib/opencode/openchamber-routes.js`: OpenChamber update and models metadata route registration.
- `packages/web/server/lib/opencode/pwa-manifest-routes.js`: PWA manifest route registration with recent-session shortcut resolution and short-lived caching.
- `packages/web/server/lib/opencode/project-icon-routes.js`: project icon upload/read/discovery route registration and icon storage orchestration.
- `packages/web/server/lib/opencode/skill-routes.js`: route registration for skill config CRUD, supporting files, and skills catalog scan/install flows.
- `packages/web/server/lib/opencode/settings-runtime.js`: Settings persistence runtime (disk IO, migrations, normalization, project validation, and persisted update serialization).
- `packages/web/server/lib/opencode/settings-helpers.js`: Settings payload sanitization/format helpers runtime for response shaping and persisted merge prep.
- `packages/web/server/lib/opencode/settings-normalization-runtime.js`: path/settings/tunnel normalization and sanitization helpers runtime used by settings/routes/config wiring.
- `packages/web/server/lib/opencode/theme-runtime.js`: custom theme JSON validation and theme directory loading runtime for settings utility routes.
- `packages/web/server/lib/opencode/proxy.js`: OpenCode API/SSE forwarding and readiness-gate route registration.
- `packages/web/server/lib/opencode/session-runtime.js`: session status/attention/activity runtime for OpenCode SSE events.
- `packages/web/server/lib/opencode/watcher.js`: global SSE watcher runtime for push/session event fanout.
- `packages/web/server/lib/opencode/shared.js`: shared utilities for config, markdown, skills, and git helpers.
- `packages/web/server/lib/ui-auth/ui-auth.js`: UI session authentication runtime (outside OpenCode module).
- `packages/web/server/lib/ui-auth/ui-passkeys.js`: UI passkey storage and WebAuthn registration/authentication helpers (outside OpenCode module).

## Public exports (auth.js)
- `readAuthFile()`: Reads and parses `~/.local/share/opencode/auth.json`.
- `writeAuthFile(auth)`: Writes auth file with automatic backup.
- `removeProviderAuth(providerId)`: Removes a provider's auth entry.
- `getProviderAuth(providerId)`: Returns auth for a specific provider or null.
- `listProviderAuths()`: Returns list of provider IDs with configured auth.
- `AUTH_FILE`: Auth file path constant.
- `OPENCODE_DATA_DIR`: OpenCode data directory path constant.

## Public exports (shared.js)
- `OPENCODE_CONFIG_DIR`, `AGENT_DIR`, `COMMAND_DIR`, `SKILL_DIR`, `CONFIG_FILE`, `CUSTOM_CONFIG_FILE`: Path constants.
- `AGENT_SCOPE`, `COMMAND_SCOPE`, `SKILL_SCOPE`: Scope constants with USER and PROJECT values.
- `ensureDirs()`: Creates required OpenCode directories.
- `parseMdFile(filePath)`, `writeMdFile(filePath, frontmatter, body)`: Markdown file operations with YAML frontmatter.
- `getConfigPaths(workingDirectory)`, `readConfigLayers(workingDirectory)`, `readConfig(workingDirectory)`: Config file operations with layer merging (user, project, custom).
- `writeConfig(config, filePath)`: Writes config with automatic backup.
- `getJsonEntrySource(layers, sectionKey, entryName)`: Resolves which config layer provides an entry.
- `getJsonWriteTarget(layers, preferredScope)`: Determines write target for config updates.
- `getAncestors(startDir, stopDir)`, `findWorktreeRoot(startDir)`: Git worktree helpers.
- `isPromptFileReference(value)`, `resolvePromptFilePath(reference)`, `writePromptFile(filePath, content)`: Prompt file reference handling.
- `walkSkillMdFiles(rootDir)`: Recursively finds all SKILL.md files.
- `addSkillFromMdFile(skillsMap, skillMdPath, scope, source)`: Parses and indexes a skill file.
- `resolveSkillSearchDirectories(workingDirectory)`: Returns skill search path order (config, project, home, custom).
- `listSkillSupportingFiles(skillDir)`, `readSkillSupportingFile(skillDir, relativePath)`, `writeSkillSupportingFile(skillDir, relativePath, content)`, `deleteSkillSupportingFile(skillDir, relativePath)`: Skill supporting file management.

## Public exports (routes.js)
- `registerOpenCodeRoutes(app, dependencies)`: Registers OpenCode-owned HTTP routes and internal module runtime:
  - `GET /api/config/settings`
  - `PUT /api/config/settings`
  - `GET /api/config/opencode-resolution`
  - `POST /api/opencode/upgrade` (proxies OpenCode upgrade, then restarts managed OpenCode so the new binary is active)
  - `GET /api/opencode/upgrade-status`
  - `POST /api/opencode/directory`
  - `GET /api/provider/:providerId/source`
  - `DELETE /api/provider/:providerId/auth`
- Owns lazy auth library loading for provider auth checks/removal.
- Keeps route behavior independent from composition root; `index.js` now supplies dependencies only.

## Public exports (session-runtime.js)
- `createSessionRuntime({ writeSseEvent, getNotificationClients, broadcastEvent? })`: creates runtime-owned state machine and APIs for session status.
- Returned API:
  - `processOpenCodeSsePayload(payload)`
  - `getSessionActivitySnapshot()`
  - `getSessionStateSnapshot()`
  - `getSessionAttentionSnapshot()`
  - `getSessionState(sessionId)`
  - `getSessionAttentionState(sessionId)`
  - `markSessionViewed(sessionId, clientId)`
  - `markSessionUnviewed(sessionId, clientId)`
  - `markUserMessageSent(sessionId)`
  - `resetAllSessionActivityToIdle()`
  - `dispose()`

## Public exports (lifecycle.js)
- `createOpenCodeLifecycleRuntime(dependencies)`: creates lifecycle runtime for managed/external OpenCode process orchestration.
- Returned API:
  - `startOpenCode()`
  - `restartOpenCode()`
  - `waitForOpenCodeReady(timeoutMs?, intervalMs?)`
  - `waitForAgentPresence(agentName, timeoutMs?, intervalMs?)`
  - `refreshOpenCodeAfterConfigChange(reason, options?)`
  - `bootstrapOpenCodeAtStartup()`
  - `startHealthMonitoring(healthCheckIntervalMs)`
  - `waitForPortRelease(port, timeoutMs, hostname?)`
  - `killProcessOnPort(port)`

## Public exports (env-runtime.js)
- `createOpenCodeEnvRuntime(dependencies)`: creates runtime that owns OpenCode CLI environment and binary discovery state.
- Returned API:
  - `applyLoginShellEnvSnapshot()`
  - `getLoginShellEnvSnapshot()`
  - `ensureOpencodeCliEnv()`
  - `applyOpencodeBinaryFromSettings()`
  - `resolveOpencodeCliPath()`
  - `resolveManagedOpenCodeLaunchSpec(opencodePath)`: resolves the effective managed OpenCode launch target, unwrapping Windows package-manager shims to a direct native binary or explicit runtime+script when possible.
  - `resolveGitBinaryForSpawn()`
  - `resolveWslExecutablePath()`
  - `buildWslExecArgs(execArgs, distroOverride?)`
  - `isExecutable(filePath)`
  - `searchPathFor(binaryName)`
  - `clearResolvedOpenCodeBinary()`

## Public exports (env-config.js)
- `resolveOpenCodeEnvConfig(options?)`: resolves and validates OpenCode host/port/hostname environment configuration.
- Returned object fields:
  - `configuredOpenCodePort`
  - `configuredOpenCodeHost`
  - `effectivePort`
  - `configuredOpenCodeHostname`

## Public exports (hmr-state-runtime.js)
- `createHmrStateRuntime(dependencies)`: creates runtime for HMR state container initialization and runtime<->HMR state synchronization.
- Returned API:
  - `getOrCreateHmrState()`
  - `ensureUserProvidedOpenCodePassword(hmrState)`
  - `getUserProvidedOpenCodePassword(hmrState)`
  - `resolveOpenCodeAuthFromState({ hmrState, userProvidedOpenCodePassword })`
  - `syncStateFromRuntime(hmrState, runtime)`
  - `restoreRuntimeFromState({ hmrState, userProvidedOpenCodePassword })`

## Public exports (bootstrap-runtime.js)
- `createBootstrapRuntime(dependencies)`: creates runtime for base app route bootstrap and UI auth controller initialization.
- Returned API:
  - `setupBaseRoutes(app, options)`

## Public exports (network-runtime.js)
- `createOpenCodeNetworkRuntime(dependencies)`: creates runtime for OpenCode network and URL concerns.
- Returned API:
  - `waitForReady(url, timeoutMs?)`
  - `normalizeApiPrefix(prefix)`
  - `setDetectedOpenCodeApiPrefix()`
  - `buildOpenCodeUrl(path, prefixOverride?)`
  - `ensureOpenCodeApiPrefix()`
  - `scheduleOpenCodeApiDetection()`

## Public exports (settings-runtime.js)
- `createSettingsRuntime(dependencies)`: creates settings lifecycle runtime for read/migrate/persist concerns.
- Returned API:
  - `readSettingsFromDisk()`
  - `readSettingsFromDiskMigrated()`
  - `writeSettingsToDisk(settings)`
  - `persistSettings(changes)`

## Public exports (settings-helpers.js)
- `createSettingsHelpers(dependencies)`: creates settings helper runtime for settings request/response shaping.
- Returned API:
  - `normalizePwaAppName(value, fallback?)`
  - `sanitizeSettingsUpdate(payload)`
  - `mergePersistedSettings(current, changes)`
  - `formatSettingsResponse(settings)`

## Public exports (settings-normalization-runtime.js)
- `createSettingsNormalizationRuntime(dependencies)`: creates normalization/sanitization runtime for shared settings and tunnel helper logic.
- Returned API:
  - `normalizeDirectoryPath(value)`
  - `normalizePathForPersistence(value)`
  - `normalizeSettingsPaths(input)`
  - `normalizeTunnelBootstrapTtlMs(value)`
  - `normalizeTunnelSessionTtlMs(value)`
  - `normalizeManagedRemoteTunnelHostname(value)`
  - `normalizeManagedRemoteTunnelPresets(value)`
  - `normalizeManagedRemoteTunnelPresetTokens(value)`
  - `isUnsafeSkillRelativePath(value)`
  - `sanitizeTypographySizesPartial(input)`
  - `normalizeStringArray(input)`
  - `sanitizeModelRefs(input, limit)`
  - `sanitizeSkillCatalogs(input)`
  - `sanitizeProjects(input)`

## Public exports (theme-runtime.js)
- `createThemeRuntime(dependencies)`: creates custom theme runtime for on-disk theme discovery and JSON normalization/validation.
- Returned API:
  - `normalizeThemeJson(raw)`
  - `readCustomThemesFromDisk()`

## Public exports (project-directory-runtime.js)
- `createProjectDirectoryRuntime(dependencies)`: creates runtime for request/project directory candidate normalization and validation.
- Returned API:
  - `resolveDirectoryCandidate(value)`
  - `validateDirectoryPath(candidate)`
  - `resolveProjectDirectory(req)`
  - `resolveOptionalProjectDirectory(req)`

## Public exports (config-entity-routes.js)
- `registerConfigEntityRoutes(app, dependencies)`: registers configuration entity routes:
  - Agents: `/api/config/agents/:name` and `/api/config/agents/:name/config`
  - Commands: `/api/config/commands/:name`
  - MCP servers: `/api/config/mcp` and `/api/config/mcp/:name`

## Public exports (auth-state-runtime.js)
- `createOpenCodeAuthStateRuntime(dependencies)`: creates runtime for managed OpenCode auth password state and request headers.
- Returned API:
  - `getOpenCodeAuthHeaders()`
  - `isOpenCodeConnectionSecure()`
  - `ensureLocalOpenCodeServerPassword(options?)`

## Public exports (core-routes.js)
- `registerServerStatusRoutes(app, dependencies)`: registers status/system endpoints:
  - `GET /health`
  - `POST /api/system/shutdown`
  - `GET /api/system/info`
 - `registerAuthAndAccessRoutes(app, dependencies)`: registers browser auth/session exchange and API access middleware:
   - `GET /auth/session`
   - `POST /auth/session`
   - `GET /auth/passkey/status`
   - `POST /auth/passkey/authenticate/options`
   - `POST /auth/passkey/authenticate/verify`
   - `POST /auth/passkey/register/options`
   - `POST /auth/passkey/register/verify`
   - `GET /api/passkeys`
   - `DELETE /api/passkeys/:id`
   - `POST /api/auth/reset`
   - `GET /connect`
   - `app.use('/api', ...)` auth/tunnel guard
- `registerSettingsUtilityRoutes(app, dependencies)`: registers small settings utility endpoints:
  - `GET /api/config/themes`
  - `POST /api/config/reload`
- `registerCommonRequestMiddleware(app, dependencies)`: registers shared request middleware stack:
  - conditional JSON body parser behavior for `/api/*` vs non-API requests
  - URL-encoded parser setup
  - request logging middleware

## Public exports (cli-options.js)
- `parseServeCliOptions(options)`: parses serve CLI flags and environment-derived defaults:
  - Port/host/ui-password
  - Tunnel provider/mode/config/token/hostname
  - Legacy `--tunnel` shorthand normalization

## Public exports (cli-entry-runtime.js)
- `runCliEntryIfMain(dependencies)`: detects direct CLI execution and runs server startup with parsed CLI options.

## Public exports (server-utils-runtime.js)
- `createServerUtilsRuntime(dependencies)`: creates server utility runtime for OpenCode orchestration helpers.
- Returned API:
  - `setOpenCodePort(port)`
  - `waitForOpenCodePort(timeoutMs?)`
  - `buildAugmentedPath()`
  - `parseSseDataPayload(block)`
  - `fetchAgentsSnapshot()`
  - `fetchProvidersSnapshot()`
  - `fetchModelsSnapshot()`
  - `setupProxy(app)`

## Public exports (shutdown-runtime.js)
- `createGracefulShutdownRuntime(dependencies)`: creates graceful shutdown runtime for managed OpenCode and web server teardown sequencing.
- Returned API:
  - `gracefulShutdown(options?)`

## Public exports (server-startup-runtime.js)
- `createServerStartupRuntime(dependencies)`: creates runtime for server bind/startup tunnel and process handler wiring.
- Returned API:
  - `resolveBindHost(host)`
  - `startListeningAndMaybeTunnel(options)`
  - `attachProcessHandlers(options)`

## Public exports (static-routes-runtime.js)
- `createStaticRoutesRuntime(dependencies)`: creates runtime for static dist resolution and static route registration.
- Returned API:
  - `registerStaticRoutes(app)`

## Public exports (feature-routes-runtime.js)
- `createFeatureRoutesRuntime(dependencies)`: creates runtime for main feature route registration orchestration.
- Returned API:
  - `registerRoutes(app, routeDependencies)`

## Public exports (opencode-resolution-runtime.js)
- `createOpenCodeResolutionRuntime(dependencies)`: creates runtime for OpenCode binary/source snapshot resolution.
- Returned API:
  - `getOpenCodeResolutionSnapshot(settings)`: returns configured/resolved OpenCode binary details plus effective managed-launch fields (`launchBinary`, `launchArgs`, `launchWrapperType`) when applicable.

## Public exports (tunnel-wiring-runtime.js)
- `createTunnelWiringRuntime(dependencies)`: creates runtime for tunnel service construction and tunnel route registration.
- Returned API:
  - `initialize(app, initialPort)`

## Public exports (startup-pipeline-runtime.js)
- `createStartupPipelineRuntime(dependencies)`: creates runtime for terminal wiring, proxy/bootstrap scheduling, static route registration, and server startup/listen flow.
- Returned API:
  - `run(options)`

## Public exports (openchamber-routes.js)
- `registerOpenChamberRoutes(app, dependencies)`: registers OpenChamber endpoints:
  - `GET /api/openchamber/update-check`
  - `POST /api/openchamber/update-install`
  - `GET /api/openchamber/models-metadata`
  - `GET /api/zen/models`

## Public exports (pwa-manifest-routes.js)
- `registerPwaManifestRoute(app, dependencies)`: registers PWA manifest endpoint with dynamic app-name resolution and recent-session shortcuts:
  - `GET /manifest.webmanifest`

## Public exports (project-icon-routes.js)
- `registerProjectIconRoutes(app, dependencies)`: registers project icon routes and owns icon storage/discovery flow:
  - `GET /api/projects/:projectId/icon`
  - `PUT /api/projects/:projectId/icon`
  - `DELETE /api/projects/:projectId/icon`
  - `POST /api/projects/:projectId/icon/discover`

## Public exports (skill-routes.js)
- `registerSkillRoutes(app, dependencies)`: registers skills-related routes:
  - Skills config CRUD and metadata under `/api/config/skills*`
  - Skills catalog listing/source pagination, scan, and install routes
  - Supporting skill file read/write/delete routes

## Public exports (proxy.js)
- `registerOpenCodeProxy(app, dependencies)`: registers OpenCode proxy routes and middleware.
- Owns:
  - SSE forwarders: `GET /api/global/event`, `GET /api/event`
  - Session message forwarder: `POST /api/session/:sessionId/message`
  - Generic `/api/*` forwarding with hop-by-hop header filtering
  - Windows `/session` merge fallback path behavior
  - OpenCode readiness gate for proxied `/api` requests

## Public exports (watcher.js)
- `createOpenCodeWatcherRuntime(dependencies)`: creates global event watcher runtime backed by the shared upstream SSE reader.
- Returned API:
  - `start()`
  - `stop()`
- Behavior:
  - Waits for OpenCode readiness before attaching the watcher.
  - In production wiring, subscribes to the shared global message-stream hub instead of opening its own `/global/event` connection.
  - Can still create its own `/global/event` reader when no shared hub is provided, which keeps module tests and isolated reuse simple.
  - Reuses event-stream parsing, `Last-Event-ID`, stall timeout, and reconnect behavior.
  - Forwards unwrapped global event payloads into notification/session side effects.

## Storage and configuration
- Provider auth: `~/.local/share/opencode/auth.json`.
- User config: `~/.config/opencode/opencode.json`.
- Project config: `<workingDirectory>/.opencode/opencode.json` or `opencode.json`.
- Custom config: `OPENCODE_CONFIG` env var path.
- Rate limit config: `OPENCHAMBER_RATE_LIMIT_MAX_ATTEMPTS`, `OPENCHAMBER_RATE_LIMIT_NO_IP_MAX_ATTEMPTS` env vars.

## Notes for contributors
- This module serves as foundation for OpenCode-related server utilities.
- Route ownership moved to module-level `routes.js`; `index.js` wires dependencies only.
- All file writes include automatic backup before modification.
- Config merging follows priority: custom > project > user.
- UI auth uses scrypt for password hashing with constant-time comparison.
- Tunnel auth treats `host.docker.internal` as local-only when the socket remote IP is private/loopback.
