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/**
* vision-handoff extension — registers the universal vision handoff service +
* the `consult_vision` tool.
*
* The service performs provider-agnostic vision handoff: when a non-vision model
* (e.g. glm-5.2) receives an image, it replaces the image with a numbered
* placeholder and registers it for tool access. The `consult_vision` tool opens
* a NEW conversation tab with a vision-capable model (e.g. Kimi), attaches the
* image + the model's specific question, and returns the conversation ID + the
* vision model's answer. Follow-ups go through the dispatch CLI.
*
* Images are saved to a tmp directory (`/tmp/dispatch/images/<convId>/`) so the
* conversation store (SQLite) only holds a compact URL reference — not
* megabytes of base64. Tmp files are purged on reboot (ephemeral dir), after
* compaction (the transcription replaces the image), and on conversation close.
*
* Effects (filesystem, orchestrator) live here in the shell, injected into the
* service. The pure decisions live in `pure.ts`. No `console.*`; logging via
* `host.logger`.
*/
import { mkdir, readFile, rm, unlink, writeFile } from "node:fs/promises";
import { extname, isAbsolute, join, resolve as pathResolve } from "node:path";
import { conversationStoreHandle } from "@dispatch/conversation-store";
import type { CredentialStore } from "@dispatch/credential-store";
import { credentialStoreHandle } from "@dispatch/credential-store";
import type { Extension, HostAPI, Manifest } from "@dispatch/kernel";
import {
createVisionHandoffService,
orchestratorLocalHandle,
visionHandoffHandle,
} from "./service.js";
import { createConsultVisionTool } from "./tool.js";
export const manifest: Manifest = {
id: "vision-handoff",
name: "Vision Handoff",
version: "0.0.0",
apiVersion: "^0.1.0",
trust: "bundled",
activation: "eager",
capabilities: { network: true },
contributes: { services: ["vision-handoff/service"], tools: ["consult_vision"] },
};
const IMAGE_DIR = process.env.DISPATCH_IMAGE_DIR ?? "/tmp/dispatch/images";
/** MIME types for recognized image extensions. */
const MIME_BY_EXT: Readonly<Record<string, string>> = {
".png": "image/png",
".jpg": "image/jpeg",
".jpeg": "image/jpeg",
".webp": "image/webp",
".gif": "image/gif",
".bmp": "image/bmp",
};
/** Reverse: MIME → extension. */
const EXT_BY_MIME: Readonly<Record<string, string>> = {
"image/png": ".png",
"image/jpeg": ".jpg",
"image/webp": ".webp",
"image/gif": ".gif",
"image/bmp": ".bmp",
};
/**
* Read an image file from disk as a base64 data URL. Resolves relative paths
* against the cwd (the conversation's working directory). Throws on missing
* file / read error (the caller surfaces it). The shell edge — real `node:fs`.
*/
async function readFileAsDataUrl(path: string, cwd?: string): Promise<string> {
const abs = cwd !== undefined && !isAbsolute(path) ? pathResolve(cwd, path) : pathResolve(path);
const buf = await readFile(abs);
const ext = extname(abs).toLowerCase();
const mime = MIME_BY_EXT[ext] ?? "image/png";
return `data:${mime};base64,${buf.toString("base64")}`;
}
/**
* Save a data URL image to a tmp file and return a compact HTTP path.
* The compact URL (`/images/<conversationId>/<uuid>.<ext>`) is what gets
* persisted in the conversation store — a tiny string, not megabytes of base64.
*/
async function saveImageToTmp(
conversationId: string,
dataUrl: string,
mimeType?: string,
): Promise<string> {
const mime = mimeType ?? "image/png";
const ext = EXT_BY_MIME[mime] ?? ".png";
const imageId = `${crypto.randomUUID()}${ext}`;
const dir = join(IMAGE_DIR, conversationId);
await mkdir(dir, { recursive: true });
const filePath = join(dir, imageId);
const base64 = dataUrl.split(",")[1] ?? "";
await writeFile(filePath, Buffer.from(base64, "base64"));
return `/images/${conversationId}/${imageId}`;
}
/**
* Resolve a compact URL (`/images/<convId>/<imageId>`) back to a data URL by
* reading the tmp file. Data URLs and HTTP URLs pass through unchanged.
*/
async function resolveImageUrl(url: string): Promise<string> {
if (url.startsWith("data:") || url.startsWith("http")) return url;
if (!url.startsWith("/images/")) return url;
const parts = url.split("/"); // ["", "images", convId, imageId]
const convId = parts[2];
const imageId = parts[3];
if (convId === undefined || imageId === undefined) return url;
const filePath = join(IMAGE_DIR, convId, imageId);
const buf = await readFile(filePath);
const ext = extname(imageId).toLowerCase();
const mime = MIME_BY_EXT[ext] ?? "image/png";
return `data:${mime};base64,${buf.toString("base64")}`;
}
/** Delete a single tmp image file (after compaction — best-effort). */
async function deleteTmpImage(compactUrl: string): Promise<void> {
if (!compactUrl.startsWith("/images/")) return;
const parts = compactUrl.split("/");
const convId = parts[2];
const imageId = parts[3];
if (convId === undefined || imageId === undefined) return;
const filePath = join(IMAGE_DIR, convId, imageId);
try {
await unlink(filePath);
} catch {
// Best-effort — file may already be deleted.
}
}
/** Delete all tmp images for a conversation (on close — best-effort). */
async function deleteConversationImages(conversationId: string): Promise<void> {
const dir = join(IMAGE_DIR, conversationId);
try {
await rm(dir, { recursive: true, force: true });
} catch {
// Best-effort.
}
}
export async function activate(host: HostAPI): Promise<void> {
const credentialStore = host.getService(credentialStoreHandle) as CredentialStore | undefined;
if (credentialStore === undefined) {
host.logger.warn(
"vision-handoff: credential-store service not available. The consult_vision tool and image handoff are disabled.",
);
return;
}
const resolveModel = (modelName: string) => {
const resolved = credentialStore.resolve(modelName);
if (resolved === undefined) return undefined;
const provider = host.getProviders().get(resolved.providerId);
if (provider === undefined) return undefined;
return { provider, model: resolved.model };
};
const service = createVisionHandoffService({
credentialStore,
resolveModel,
readFileAsDataUrl,
saveImageToTmp,
resolveImageUrl,
deleteTmpImage,
deleteConversationImages,
resolveOrchestrator: () => {
const loaded = host.getExtensions().some((m) => m.id === "session-orchestrator");
if (!loaded) return undefined;
try {
return host.getService(orchestratorLocalHandle);
} catch {
return undefined;
}
},
getImageTranscriptions: async (conversationId: string) => {
const store = host.getService(conversationStoreHandle);
return store.getImageTranscriptions(conversationId);
},
setImageTranscription: async (conversationId: string, url: string, text: string) => {
const store = host.getService(conversationStoreHandle);
await store.setImageTranscription(conversationId, url, text);
},
setConversationTitle: async (conversationId: string, title: string) => {
const store = host.getService(conversationStoreHandle);
await store.setConversationTitle(conversationId, title);
},
logger: host.logger.child({ extensionId: "vision-handoff" }),
});
host.provideService(visionHandoffHandle, service);
host.defineTool(createConsultVisionTool(service));
host.logger.info("vision-handoff: registered (consult_vision tool + handoff service)");
}
export const extension: Extension = { manifest, activate };
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