feat(hooks): add PreToolUse hook executor

🤖 GENERATED WITH ASSISTANCE OF [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/hooks/claude-code-hooks/config-loader.ts

@@ -0,0 +1,105 @@
+import { existsSync } from "fs"
+import { homedir } from "os"
+import { join } from "path"
+import type { ClaudeHookEvent } from "./types"
+import { log } from "../../shared/logger"
+
+export interface DisabledHooksConfig {
+  Stop?: string[]
+  PreToolUse?: string[]
+  PostToolUse?: string[]
+  UserPromptSubmit?: string[]
+}
+
+export interface PluginExtendedConfig {
+  disabledHooks?: DisabledHooksConfig
+}
+
+const USER_CONFIG_PATH = join(homedir(), ".config", "opencode", "opencode-cc-plugin.json")
+
+function getProjectConfigPath(): string {
+  return join(process.cwd(), ".opencode", "opencode-cc-plugin.json")
+}
+
+async function loadConfigFromPath(path: string): Promise<PluginExtendedConfig | null> {
+  if (!existsSync(path)) {
+    return null
+  }
+
+  try {
+    const content = await Bun.file(path).text()
+    return JSON.parse(content) as PluginExtendedConfig
+  } catch (error) {
+    log("Failed to load config", { path, error })
+    return null
+  }
+}
+
+function mergeDisabledHooks(
+  base: DisabledHooksConfig | undefined,
+  override: DisabledHooksConfig | undefined
+): DisabledHooksConfig {
+  if (!override) return base ?? {}
+  if (!base) return override
+
+  return {
+    Stop: override.Stop ?? base.Stop,
+    PreToolUse: override.PreToolUse ?? base.PreToolUse,
+    PostToolUse: override.PostToolUse ?? base.PostToolUse,
+    UserPromptSubmit: override.UserPromptSubmit ?? base.UserPromptSubmit,
+  }
+}
+
+export async function loadPluginExtendedConfig(): Promise<PluginExtendedConfig> {
+  const userConfig = await loadConfigFromPath(USER_CONFIG_PATH)
+  const projectConfig = await loadConfigFromPath(getProjectConfigPath())
+
+  const merged: PluginExtendedConfig = {
+    disabledHooks: mergeDisabledHooks(
+      userConfig?.disabledHooks,
+      projectConfig?.disabledHooks
+    ),
+  }
+
+  if (userConfig || projectConfig) {
+    log("Plugin extended config loaded", {
+      userConfigExists: userConfig !== null,
+      projectConfigExists: projectConfig !== null,
+      mergedDisabledHooks: merged.disabledHooks,
+    })
+  }
+
+  return merged
+}
+
+const regexCache = new Map<string, RegExp>()
+
+function getRegex(pattern: string): RegExp {
+  let regex = regexCache.get(pattern)
+  if (!regex) {
+    try {
+      regex = new RegExp(pattern)
+      regexCache.set(pattern, regex)
+    } catch {
+      regex = new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"))
+      regexCache.set(pattern, regex)
+    }
+  }
+  return regex
+}
+
+export function isHookCommandDisabled(
+  eventType: ClaudeHookEvent,
+  command: string,
+  config: PluginExtendedConfig | null
+): boolean {
+  if (!config?.disabledHooks) return false
+
+  const patterns = config.disabledHooks[eventType]
+  if (!patterns || patterns.length === 0) return false
+
+  return patterns.some((pattern) => {
+    const regex = getRegex(pattern)
+    return regex.test(command)
+  })
+}

src/hooks/claude-code-hooks/plugin-config.ts

@@ -0,0 +1,9 @@
+/**
+ * Plugin configuration for Claude Code hooks execution
+ * Contains settings for hook command execution (zsh, etc.)
+ */
+
+export const DEFAULT_CONFIG = {
+  forceZsh: true,
+  zshPath: "/bin/zsh",
+}

src/hooks/claude-code-hooks/pre-tool-use.ts

@@ -0,0 +1,172 @@
+import type {
+  PreToolUseInput,
+  PreToolUseOutput,
+  PermissionDecision,
+  ClaudeHooksConfig,
+} from "./types"
+import { findMatchingHooks, executeHookCommand, objectToSnakeCase, transformToolName, log } from "../../shared"
+import { DEFAULT_CONFIG } from "./plugin-config"
+import { isHookCommandDisabled, type PluginExtendedConfig } from "./config-loader"
+
+export interface PreToolUseContext {
+  sessionId: string
+  toolName: string
+  toolInput: Record<string, unknown>
+  cwd: string
+  transcriptPath?: string
+  toolUseId?: string
+  permissionMode?: "default" | "plan" | "acceptEdits" | "bypassPermissions"
+}
+
+export interface PreToolUseResult {
+  decision: PermissionDecision
+  reason?: string
+  modifiedInput?: Record<string, unknown>
+  elapsedMs?: number
+  hookName?: string
+  toolName?: string
+  inputLines?: string
+  // Common output fields (Claude Code spec)
+  continue?: boolean
+  stopReason?: string
+  suppressOutput?: boolean
+  systemMessage?: string
+}
+
+function buildInputLines(toolInput: Record<string, unknown>): string {
+  return Object.entries(toolInput)
+    .slice(0, 3)
+    .map(([key, val]) => {
+      const valStr = String(val).slice(0, 40)
+      return `  ${key}: ${valStr}${String(val).length > 40 ? "..." : ""}`
+    })
+    .join("\n")
+}
+
+export async function executePreToolUseHooks(
+  ctx: PreToolUseContext,
+  config: ClaudeHooksConfig | null,
+  extendedConfig?: PluginExtendedConfig | null
+): Promise<PreToolUseResult> {
+  if (!config) {
+    return { decision: "allow" }
+  }
+
+  const transformedToolName = transformToolName(ctx.toolName)
+  const matchers = findMatchingHooks(config, "PreToolUse", transformedToolName)
+  if (matchers.length === 0) {
+    return { decision: "allow" }
+  }
+
+  const stdinData: PreToolUseInput = {
+    session_id: ctx.sessionId,
+    transcript_path: ctx.transcriptPath,
+    cwd: ctx.cwd,
+    permission_mode: ctx.permissionMode ?? "bypassPermissions",
+    hook_event_name: "PreToolUse",
+    tool_name: transformedToolName,
+    tool_input: objectToSnakeCase(ctx.toolInput),
+    tool_use_id: ctx.toolUseId,
+    hook_source: "opencode-plugin",
+  }
+
+  const startTime = Date.now()
+  let firstHookName: string | undefined
+  const inputLines = buildInputLines(ctx.toolInput)
+
+  for (const matcher of matchers) {
+    for (const hook of matcher.hooks) {
+      if (hook.type !== "command") continue
+
+      if (isHookCommandDisabled("PreToolUse", hook.command, extendedConfig ?? null)) {
+        log("PreToolUse hook command skipped (disabled by config)", { command: hook.command, toolName: ctx.toolName })
+        continue
+      }
+
+      const hookName = hook.command.split("/").pop() || hook.command
+      if (!firstHookName) firstHookName = hookName
+
+      const result = await executeHookCommand(
+        hook.command,
+        JSON.stringify(stdinData),
+        ctx.cwd,
+        { forceZsh: DEFAULT_CONFIG.forceZsh, zshPath: DEFAULT_CONFIG.zshPath }
+      )
+
+      if (result.exitCode === 2) {
+        return {
+          decision: "deny",
+          reason: result.stderr || result.stdout || "Hook blocked the operation",
+          elapsedMs: Date.now() - startTime,
+          hookName: firstHookName,
+          toolName: transformedToolName,
+          inputLines,
+        }
+      }
+
+      if (result.exitCode === 1) {
+        return {
+          decision: "ask",
+          reason: result.stderr || result.stdout,
+          elapsedMs: Date.now() - startTime,
+          hookName: firstHookName,
+          toolName: transformedToolName,
+          inputLines,
+        }
+      }
+
+      if (result.stdout) {
+        try {
+          const output = JSON.parse(result.stdout) as PreToolUseOutput
+
+          // Handle deprecated decision/reason fields (Claude Code backward compat)
+          let decision: PermissionDecision | undefined
+          let reason: string | undefined
+          let modifiedInput: Record<string, unknown> | undefined
+
+          if (output.hookSpecificOutput?.permissionDecision) {
+            decision = output.hookSpecificOutput.permissionDecision
+            reason = output.hookSpecificOutput.permissionDecisionReason
+            modifiedInput = output.hookSpecificOutput.updatedInput
+          } else if (output.decision) {
+            // Map deprecated values: approve->allow, block->deny, ask->ask
+            const legacyDecision = output.decision
+            if (legacyDecision === "approve" || legacyDecision === "allow") {
+              decision = "allow"
+            } else if (legacyDecision === "block" || legacyDecision === "deny") {
+              decision = "deny"
+            } else if (legacyDecision === "ask") {
+              decision = "ask"
+            }
+            reason = output.reason
+          }
+
+          // Return if decision is set OR if any common fields are set (fallback to allow)
+          const hasCommonFields = output.continue !== undefined || 
+            output.stopReason !== undefined || 
+            output.suppressOutput !== undefined || 
+            output.systemMessage !== undefined
+
+          if (decision || hasCommonFields) {
+            return {
+              decision: decision ?? "allow",
+              reason,
+              modifiedInput,
+              elapsedMs: Date.now() - startTime,
+              hookName: firstHookName,
+              toolName: transformedToolName,
+              inputLines,
+              continue: output.continue,
+              stopReason: output.stopReason,
+              suppressOutput: output.suppressOutput,
+              systemMessage: output.systemMessage,
+            }
+          }
+        } catch {
+        }
+      }
+    }
+  }
+
+  return { decision: "allow" }
+}

src/hooks/claude-code-hooks/tool-input-cache.ts

@@ -0,0 +1,47 @@
+/**
+ * Caches tool_input from PreToolUse for PostToolUse
+ */
+
+interface CacheEntry {
+  toolInput: Record<string, unknown>
+  timestamp: number
+}
+
+const cache = new Map<string, CacheEntry>()
+
+const CACHE_TTL = 60000 // 1 minute
+
+export function cacheToolInput(
+  sessionId: string,
+  toolName: string,
+  invocationId: string,
+  toolInput: Record<string, unknown>
+): void {
+  const key = `${sessionId}:${toolName}:${invocationId}`
+  cache.set(key, { toolInput, timestamp: Date.now() })
+}
+
+export function getToolInput(
+  sessionId: string,
+  toolName: string,
+  invocationId: string
+): Record<string, unknown> | null {
+  const key = `${sessionId}:${toolName}:${invocationId}`
+  const entry = cache.get(key)
+  if (!entry) return null
+
+   cache.delete(key)
+  if (Date.now() - entry.timestamp > CACHE_TTL) return null
+
+  return entry.toolInput
+}
+
+// Periodic cleanup (every minute)
+setInterval(() => {
+  const now = Date.now()
+  for (const [key, entry] of cache.entries()) {
+    if (now - entry.timestamp > CACHE_TTL) {
+      cache.delete(key)
+    }
+  }
+}, CACHE_TTL)