feat: add comprehensive icon validation to mcpb validate command
Implements icon validation to catch common issues that prevent icons from
displaying in Claude Desktop. Uses a non-blocking warning approach for
remote URLs to maintain flexibility for MCPB's evolving multi-platform
ecosystem.
## Changes
### Core Implementation (src/node/validate.ts)
- Add `isPNG()` helper to validate PNG file signatures via magic bytes
- Add `validateIcon()` function with comprehensive checks:
- **Warn** about remote URLs (non-blocking, best practice guidance)
- **Reject** ${__dirname} variable usage in icon field (doesn't work)
- **Reject** absolute paths (not portable)
- Verify icon file exists at specified path
- Verify icon file is valid PNG format
- Recommend 512×512 size for Claude Desktop
- Integrate icon validation into `validateManifest()` after schema validation
### Test Coverage
- Update `test/icon-validation.test.ts` - Remote URL test now expects warning
- Update `test/cli.test.ts` - Integration test updated for warnings
- All 109 tests passing
### Documentation Updates
- Update examples/hello-world-node/manifest.json to v0.3
## Validation Behavior
**Remote URLs (WARNING - non-blocking):**
```
Icon path uses a remote URL. Best practice for local MCP servers:
Use local files like "icon": "icon.png" for maximum compatibility.
Claude Desktop currently only supports local icon files in bundles.
```
**Result:** Validation passes, developer is informed
**Other Issues (ERROR - blocking):**
- ${__dirname} usage: Rejects (doesn't work)
- Absolute paths: Rejects (not portable)
- Missing files: Rejects (broken reference)
- Non-PNG files: Rejects (wrong format)
## Rationale
**Non-Blocking Approach:**
- Doesn't prevent valid bundles from being created
- Educates developers about best practices
- Maintains flexibility as MCPB evolves beyond Claude Desktop
- Future-proof if remote URL support is added
**Still Protective:**
- Blocks truly broken configurations (missing files, wrong formats)
- Provides actionable error messages for fixable issues
Based on real-world findings from investigating icon display issues in
Claude Desktop with production MCPB bundles.
This commit is contained in:
Bryan Thompson
parent
11d1397ee8
commit
ccf9470979
5 changed files with 521 additions and 4 deletions
|
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@ -1,6 +1,6 @@
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{
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"$schema": "../../dist/mcpb-manifest.schema.json",
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"manifest_version": "0.1",
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"manifest_version": "0.3",
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"name": "hello-world-node",
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"display_name": "Hello World MCP Server (Reference Extension)",
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"version": "0.1.0",
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@ -6,12 +6,12 @@
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},
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"dxt_version": {
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"type": "string",
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"const": "0.2",
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"const": "0.3",
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"description": "@deprecated Use manifest_version instead"
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},
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"manifest_version": {
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"type": "string",
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"const": "0.2"
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"const": "0.3"
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},
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"name": {
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"type": "string"
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@ -80,12 +80,54 @@
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"icon": {
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"type": "string"
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},
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"icons": {
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"type": "array",
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"items": {
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"type": "object",
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"properties": {
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"src": {
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"type": "string"
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},
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"sizes": {
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"type": "string",
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"pattern": "^\\d+x\\d+$"
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},
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"theme": {
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"type": "string",
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"minLength": 1
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}
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},
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"required": [
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"src",
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"sizes"
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],
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"additionalProperties": false
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}
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},
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"screenshots": {
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"type": "array",
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"items": {
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"type": "string"
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}
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},
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"localization": {
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"type": "object",
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"properties": {
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"resources": {
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"type": "string",
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"pattern": "\\$\\{locale\\}"
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},
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"default_locale": {
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"type": "string",
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"pattern": "^[A-Za-z0-9]{2,8}(?:-[A-Za-z0-9]{1,8})*$"
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}
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},
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"required": [
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"resources",
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"default_locale"
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],
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"additionalProperties": false
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},
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"server": {
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"type": "object",
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"properties": {
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@ -313,6 +355,13 @@
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],
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"additionalProperties": false
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}
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},
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"_meta": {
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"type": "object",
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"additionalProperties": {
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"type": "object",
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"additionalProperties": {}
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}
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}
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},
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"required": [
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@ -2,7 +2,7 @@ import { existsSync, readFileSync, statSync } from "fs";
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import * as fs from "fs/promises";
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import { DestroyerOfModules } from "galactus";
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import * as os from "os";
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import { join, resolve } from "path";
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import { dirname, isAbsolute, join, resolve } from "path";
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import prettyBytes from "pretty-bytes";
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import { unpackExtension } from "../cli/unpack.js";
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@ -11,6 +11,102 @@ import {
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LATEST_MANIFEST_SCHEMA_LOOSE,
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} from "../shared/constants.js";
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/**
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* Check if a buffer contains a valid PNG file signature
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*/
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function isPNG(buffer: Buffer): boolean {
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// PNG signature: 89 50 4E 47 0D 0A 1A 0A
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return (
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buffer.length >= 8 &&
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buffer[0] === 0x89 &&
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buffer[1] === 0x50 &&
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buffer[2] === 0x4e &&
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buffer[3] === 0x47 &&
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buffer[4] === 0x0d &&
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buffer[5] === 0x0a &&
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buffer[6] === 0x1a &&
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buffer[7] === 0x0a
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);
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}
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/**
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* Validate icon field in manifest
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* @param iconPath - The icon path from manifest.json
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* @param baseDir - The base directory containing the manifest
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* @returns Validation result with errors and warnings
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*/
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function validateIcon(
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iconPath: string,
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baseDir: string,
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): { valid: boolean; errors: string[]; warnings: string[] } {
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const errors: string[] = [];
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const warnings: string[] = [];
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const isRemoteUrl =
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iconPath.startsWith("http://") || iconPath.startsWith("https://");
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const hasVariableSubstitution = iconPath.includes("${__dirname}");
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const isAbsolutePath = isAbsolute(iconPath);
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// Warn about remote URLs (best practice: use local files)
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if (isRemoteUrl) {
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warnings.push(
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"Icon path uses a remote URL. " +
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'Best practice for local MCP servers: Use local files like "icon": "icon.png" for maximum compatibility. ' +
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"Claude Desktop currently only supports local icon files in bundles.",
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);
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}
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// Check for ${__dirname} variable (error - doesn't work)
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if (hasVariableSubstitution) {
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errors.push(
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'Icon path should not use ${__dirname} variable substitution. ' +
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'Use a simple relative path like "icon.png" instead of "${__dirname}/icon.png".',
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);
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}
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// Check for absolute path (error - not portable)
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if (isAbsolutePath) {
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errors.push(
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"Icon path must be relative to the bundle root, not an absolute path. " +
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`Found: "${iconPath}"`,
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);
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}
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// Only proceed with file checks if the path looks like a local file
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if (!isRemoteUrl && !isAbsolutePath && !hasVariableSubstitution) {
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// Check file existence
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const fullIconPath = join(baseDir, iconPath);
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if (!existsSync(fullIconPath)) {
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errors.push(`Icon file not found at path: ${iconPath}`);
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} else {
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try {
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// Check PNG format
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const buffer = readFileSync(fullIconPath);
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if (!isPNG(buffer)) {
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errors.push(
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`Icon file must be PNG format. The file at "${iconPath}" does not appear to be a valid PNG file.`,
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);
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} else {
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// File exists and is a valid PNG - add recommendation
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warnings.push(
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"Icon validation passed. Recommended size is 512×512 pixels for best display in Claude Desktop.",
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);
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}
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} catch (error) {
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errors.push(
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`Unable to read icon file at "${iconPath}": ${error instanceof Error ? error.message : "Unknown error"}`,
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);
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}
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}
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}
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return {
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valid: errors.length === 0,
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errors,
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warnings,
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};
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}
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export function validateManifest(inputPath: string): boolean {
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try {
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const resolvedPath = resolve(inputPath);
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@ -28,6 +124,28 @@ export function validateManifest(inputPath: string): boolean {
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if (result.success) {
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console.log("Manifest schema validation passes!");
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// Validate icon if present
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if (manifestData.icon) {
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const baseDir = dirname(manifestPath);
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const iconValidation = validateIcon(manifestData.icon, baseDir);
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if (iconValidation.errors.length > 0) {
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console.log("\nERROR: Icon validation failed:\n");
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iconValidation.errors.forEach((error) => {
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console.log(` - ${error}`);
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});
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return false;
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}
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if (iconValidation.warnings.length > 0) {
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console.log("\nIcon validation warnings:\n");
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iconValidation.warnings.forEach((warning) => {
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console.log(` - ${warning}`);
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});
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}
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}
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return true;
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} else {
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console.log("ERROR: Manifest validation failed:\n");
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@ -80,6 +80,93 @@ describe("DXT CLI", () => {
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fs.unlinkSync(invalidJsonPath);
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});
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describe("icon validation integration", () => {
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const testDir = join(__dirname, "icon-test");
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beforeAll(() => {
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// Create test directory
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if (!fs.existsSync(testDir)) {
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fs.mkdirSync(testDir, { recursive: true });
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}
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// Create a valid PNG file (1x1 transparent pixel)
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const validPngBuffer = Buffer.from([
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0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
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0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
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0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
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0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4,
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0x89, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41,
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0x54, 0x78, 0x9c, 0x63, 0x00, 0x01, 0x00, 0x00,
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0x05, 0x00, 0x01, 0x0d, 0x0a, 0x2d, 0xb4, 0x00,
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0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae,
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0x42, 0x60, 0x82,
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]);
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fs.writeFileSync(join(testDir, "icon.png"), validPngBuffer);
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});
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afterAll(() => {
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// Clean up test directory
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if (fs.existsSync(testDir)) {
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fs.rmSync(testDir, { recursive: true, force: true });
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}
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});
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it("should pass validation with valid local icon", () => {
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const manifestWithIcon = join(testDir, "manifest-with-icon.json");
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fs.writeFileSync(
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manifestWithIcon,
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JSON.stringify({
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manifest_version: LATEST_MANIFEST_VERSION,
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name: "test-with-icon",
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version: "1.0.0",
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description: "Test with icon",
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author: { name: "Test" },
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icon: "icon.png",
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server: {
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type: "node",
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entry_point: "server/index.js",
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mcp_config: { command: "node" },
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},
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})
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);
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const result = execSync(`node ${cliPath} validate ${manifestWithIcon}`, {
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encoding: "utf-8",
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});
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expect(result).toContain("Manifest schema validation passes!");
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expect(result).toContain("Icon validation");
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});
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it("should warn about manifest with remote icon URL but not fail", () => {
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const manifestWithUrl = join(testDir, "manifest-with-url.json");
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fs.writeFileSync(
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manifestWithUrl,
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JSON.stringify({
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manifest_version: LATEST_MANIFEST_VERSION,
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name: "test-with-url",
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version: "1.0.0",
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description: "Test with URL",
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author: { name: "Test" },
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icon: "https://example.com/icon.png",
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server: {
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type: "node",
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entry_point: "server/index.js",
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mcp_config: { command: "node" },
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},
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})
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);
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const result = execSync(`node ${cliPath} validate ${manifestWithUrl}`, {
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encoding: "utf-8",
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});
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expect(result).toContain("Manifest schema validation passes!");
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expect(result).toContain("Icon validation warnings");
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expect(result).toContain("Icon path uses a remote URL");
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});
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});
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describe("pack and unpack", () => {
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const tempDir = join(__dirname, "temp-pack-test");
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const packedFilePath = join(__dirname, "test-extension.dxt");
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263
test/icon-validation.test.ts
Normal file
263
test/icon-validation.test.ts
Normal file
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@ -0,0 +1,263 @@
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import { execSync } from "node:child_process";
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import fs from "node:fs";
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import { join } from "node:path";
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import path from "node:path";
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describe("Icon Validation", () => {
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const cliPath = join(__dirname, "../dist/cli/cli.js");
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const testFixturesDir = join(__dirname, "fixtures", "icon-validation");
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beforeAll(() => {
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// Ensure the CLI is built
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execSync("yarn build", { cwd: join(__dirname, "..") });
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// Create test fixtures directory
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if (!fs.existsSync(testFixturesDir)) {
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fs.mkdirSync(testFixturesDir, { recursive: true });
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}
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// Create a valid PNG file (1x1 transparent pixel)
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const validPngBuffer = Buffer.from([
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0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, // PNG signature
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0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, // IHDR chunk
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0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, // 1x1 dimensions
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0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4,
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0x89, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41,
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0x54, 0x78, 0x9c, 0x63, 0x00, 0x01, 0x00, 0x00,
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0x05, 0x00, 0x01, 0x0d, 0x0a, 0x2d, 0xb4, 0x00,
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0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae,
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0x42, 0x60, 0x82,
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]);
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fs.writeFileSync(join(testFixturesDir, "valid-icon.png"), validPngBuffer);
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// Create an invalid (non-PNG) file
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fs.writeFileSync(join(testFixturesDir, "invalid-icon.jpg"), "Not a PNG file");
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// Create test manifests
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createTestManifest("valid-local-icon.json", {
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icon: "valid-icon.png",
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});
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createTestManifest("invalid-remote-url.json", {
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icon: "https://example.com/icon.png",
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});
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createTestManifest("invalid-dirname-variable.json", {
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icon: "${__dirname}/icon.png",
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});
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createTestManifest("invalid-absolute-path.json", {
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icon: "/absolute/path/to/icon.png",
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});
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createTestManifest("invalid-missing-file.json", {
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icon: "missing-icon.png",
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});
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createTestManifest("invalid-non-png.json", {
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icon: "invalid-icon.jpg",
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});
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createTestManifest("no-icon.json", {
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// No icon field
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});
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});
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afterAll(() => {
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// Clean up test fixtures
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if (fs.existsSync(testFixturesDir)) {
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fs.rmSync(testFixturesDir, { recursive: true, force: true });
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}
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});
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function createTestManifest(filename: string, iconConfig: { icon?: string }) {
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const manifest = {
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manifest_version: "0.3",
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name: "test-extension",
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version: "1.0.0",
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description: "Test extension for icon validation",
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author: {
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name: "Test Author",
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},
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server: {
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type: "node",
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entry_point: "server/index.js",
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mcp_config: {
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command: "node",
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args: ["${__dirname}/server/index.js"],
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},
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},
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...iconConfig,
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};
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fs.writeFileSync(
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join(testFixturesDir, filename),
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JSON.stringify(manifest, null, 2)
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);
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}
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describe("Valid icon configurations", () => {
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it("should pass validation with a valid local PNG icon", () => {
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const manifestPath = join(testFixturesDir, "valid-local-icon.json");
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const result = execSync(`node ${cliPath} validate ${manifestPath}`, {
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encoding: "utf-8",
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});
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expect(result).toContain("Manifest schema validation passes!");
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expect(result).toContain("Icon validation passed");
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});
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it("should pass validation when no icon is specified", () => {
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const manifestPath = join(testFixturesDir, "no-icon.json");
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const result = execSync(`node ${cliPath} validate ${manifestPath}`, {
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encoding: "utf-8",
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});
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expect(result).toContain("Manifest schema validation passes!");
|
||||
expect(result).not.toContain("Icon validation");
|
||||
});
|
||||
});
|
||||
|
||||
describe("Invalid icon configurations", () => {
|
||||
it("should warn about remote URL icons but not fail", () => {
|
||||
const manifestPath = join(testFixturesDir, "invalid-remote-url.json");
|
||||
|
||||
const result = execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
});
|
||||
|
||||
expect(result).toContain("Manifest schema validation passes!");
|
||||
expect(result).toContain("Icon validation warnings");
|
||||
expect(result).toContain("Icon path uses a remote URL");
|
||||
expect(result).toContain("Best practice for local MCP servers");
|
||||
expect(result).toContain("Claude Desktop currently only supports local");
|
||||
expect(result).not.toContain("ERROR");
|
||||
});
|
||||
|
||||
it("should reject icons with ${__dirname} variable", () => {
|
||||
const manifestPath = join(testFixturesDir, "invalid-dirname-variable.json");
|
||||
|
||||
expect(() => {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
}).toThrow();
|
||||
|
||||
try {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
} catch (error: any) {
|
||||
const output = error.stdout?.toString() || "";
|
||||
expect(output).toContain("Icon validation failed");
|
||||
expect(output).toContain("${__dirname}");
|
||||
expect(output).toContain("simple relative path");
|
||||
}
|
||||
});
|
||||
|
||||
it("should reject absolute paths", () => {
|
||||
const manifestPath = join(testFixturesDir, "invalid-absolute-path.json");
|
||||
|
||||
expect(() => {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
}).toThrow();
|
||||
|
||||
try {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
} catch (error: any) {
|
||||
const output = error.stdout?.toString() || "";
|
||||
expect(output).toContain("Icon validation failed");
|
||||
expect(output).toContain("relative to the bundle root");
|
||||
}
|
||||
});
|
||||
|
||||
it("should reject missing icon files", () => {
|
||||
const manifestPath = join(testFixturesDir, "invalid-missing-file.json");
|
||||
|
||||
expect(() => {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
}).toThrow();
|
||||
|
||||
try {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
} catch (error: any) {
|
||||
const output = error.stdout?.toString() || "";
|
||||
expect(output).toContain("Icon validation failed");
|
||||
expect(output).toContain("not found");
|
||||
}
|
||||
});
|
||||
|
||||
it("should reject non-PNG files", () => {
|
||||
const manifestPath = join(testFixturesDir, "invalid-non-png.json");
|
||||
|
||||
expect(() => {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
}).toThrow();
|
||||
|
||||
try {
|
||||
execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
stdio: "pipe",
|
||||
});
|
||||
} catch (error: any) {
|
||||
const output = error.stdout?.toString() || "";
|
||||
expect(output).toContain("Icon validation failed");
|
||||
expect(output).toContain("PNG format");
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
describe("Edge cases", () => {
|
||||
it("should handle icons in subdirectories", () => {
|
||||
// Create subdirectory and icon
|
||||
const assetsDir = join(testFixturesDir, "assets");
|
||||
if (!fs.existsSync(assetsDir)) {
|
||||
fs.mkdirSync(assetsDir);
|
||||
}
|
||||
|
||||
const validPngBuffer = Buffer.from([
|
||||
0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
|
||||
0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
|
||||
0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
|
||||
0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4,
|
||||
0x89, 0x00, 0x00, 0x00, 0x0a, 0x49, 0x44, 0x41,
|
||||
0x54, 0x78, 0x9c, 0x63, 0x00, 0x01, 0x00, 0x00,
|
||||
0x05, 0x00, 0x01, 0x0d, 0x0a, 0x2d, 0xb4, 0x00,
|
||||
0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae,
|
||||
0x42, 0x60, 0x82,
|
||||
]);
|
||||
fs.writeFileSync(join(assetsDir, "icon.png"), validPngBuffer);
|
||||
|
||||
createTestManifest("valid-subdirectory-icon.json", {
|
||||
icon: "assets/icon.png",
|
||||
});
|
||||
|
||||
const manifestPath = join(testFixturesDir, "valid-subdirectory-icon.json");
|
||||
const result = execSync(`node ${cliPath} validate ${manifestPath}`, {
|
||||
encoding: "utf-8",
|
||||
});
|
||||
|
||||
expect(result).toContain("Manifest schema validation passes!");
|
||||
expect(result).toContain("Icon validation passed");
|
||||
});
|
||||
});
|
||||
|
||||
});
|
||||
|
||||
Loading…
Reference in a new issue