opencode-dynamic-context-pruning/index.ts at master · Opencode-DCP/opencode-dynamic-context-pruning · GitHub

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import type { Plugin } from "@opencode-ai/plugin"
import { getConfig } from "./lib/config"
import {
    compressDisabledByOpencode,
    hasExplicitToolPermission,
    type HostPermissionSnapshot,
} from "./lib/host-permissions"
import { Logger } from "./lib/logger"
import { createSessionState } from "./lib/state"
import { createCompressTool } from "./lib/tools"
import { PromptStore } from "./lib/prompts/store"
import {
    createChatMessageTransformHandler,
    createCommandExecuteHandler,
    createSystemPromptHandler,
    createTextCompleteHandler,
} from "./lib/hooks"
import { configureClientAuth, isSecureMode } from "./lib/auth"

const plugin: Plugin = (async (ctx) => {
    const config = getConfig(ctx)

    if (!config.enabled) {
        return {}
    }

    const logger = new Logger(config.debug)
    const state = createSessionState()
    const prompts = new PromptStore(logger, ctx.directory, config.experimental.customPrompts)
    const hostPermissions: HostPermissionSnapshot = {
        global: undefined,
        agents: {},
    }

    if (isSecureMode()) {
        configureClientAuth(ctx.client)
        // logger.info("Secure mode detected, configured client authentication")
    }

    logger.info("DCP initialized", {
        strategies: config.strategies,
    })

    return {
        "experimental.chat.system.transform": createSystemPromptHandler(
            state,
            logger,
            config,
            prompts,
        ),

        "experimental.chat.messages.transform": createChatMessageTransformHandler(
            ctx.client,
            state,
            logger,
            config,
            prompts,
            hostPermissions,
        ) as any,
        "chat.message": async (
            input: {
                sessionID: string
                agent?: string
                model?: { providerID: string; modelID: string }
                messageID?: string
                variant?: string
            },
            _output: any,
        ) => {
            state.variant = input.variant
            logger.debug("Cached variant from chat.message hook", { variant: input.variant })
        },
        "experimental.text.complete": createTextCompleteHandler(),
        "command.execute.before": createCommandExecuteHandler(
            ctx.client,
            state,
            logger,
            config,
            ctx.directory,
            hostPermissions,
        ),
        tool: {
            ...(config.compress.permission !== "deny" && {
                compress: createCompressTool({
                    client: ctx.client,
                    state,
                    logger,
                    config,
                    workingDirectory: ctx.directory,
                    prompts,
                }),
            }),
        },
        config: async (opencodeConfig) => {
            if (config.commands.enabled) {
                opencodeConfig.command ??= {}
                opencodeConfig.command["dcp"] = {
                    template: "",
                    description: "Show available DCP commands",
                }
            }

            if (
                config.compress.permission !== "deny" &&
                compressDisabledByOpencode(opencodeConfig.permission)
            ) {
                config.compress.permission = "deny"
            }

            const toolsToAdd: string[] = []
            if (config.compress.permission !== "deny" && !config.experimental.allowSubAgents) {
                toolsToAdd.push("compress")
            }

            if (toolsToAdd.length > 0) {
                const existingPrimaryTools = opencodeConfig.experimental?.primary_tools ?? []
                opencodeConfig.experimental = {
                    ...opencodeConfig.experimental,
                    primary_tools: [...existingPrimaryTools, ...toolsToAdd],
                }
            }

            if (!hasExplicitToolPermission(opencodeConfig.permission, "compress")) {
                const permission = opencodeConfig.permission ?? {}
                opencodeConfig.permission = {
                    ...permission,
                    compress: config.compress.permission,
                } as typeof permission
            }

            hostPermissions.global = opencodeConfig.permission
            hostPermissions.agents = Object.fromEntries(
                Object.entries(opencodeConfig.agent ?? {}).map(([name, agent]) => [
                    name,
                    agent?.permission,
                ]),
            )
        },
    }
}) satisfies Plugin

export default plugin