googlecharts.ts•8.01 kB
import { Tool, McpError, ErrorCode } from "@modelcontextprotocol/sdk/types.js";
import axios from "axios";
import * as fs from "fs";
import * as path from "path";
import { getDownloadPath } from "../utils/file.js";
import { QuickChartUrls } from "../utils/config.js";
/**
* Tool description
*/
export const CREATE_CHART_USING_GOOGLECHARTS_TOOL: Tool = {
name: "create-chart-using-googlecharts",
description:
"Create charts using Google Charts - get chart image URL or save chart image to file",
inputSchema: {
type: "object",
properties: {
action: {
type: "string",
enum: ["get_url", "save_file"],
description: "Whether to get chart URL or save as file",
},
outputPath: {
type: "string",
description:
"Path where to save the file (only used with action=save_file)",
},
code: {
type: "string",
description: "JavaScript drawChart function code",
},
packages: {
type: "string",
description: "Google Charts packages to load (default: 'corechart')",
},
width: {
type: "integer",
description: "Chart width in pixels",
},
height: {
type: "integer",
description: "Chart height in pixels",
},
mapsApiKey: {
type: "string",
description: "Google Maps API key (for geo charts)",
},
},
required: ["action", "code"],
},
};
/**
* Validates
*/
function validateCode(code: string): void {
if (!code || typeof code !== "string" || code.trim().length === 0) {
throw new McpError(
ErrorCode.InvalidParams,
"Code is required and must be a non-empty string"
);
}
}
function validateAction(action: string): void {
if (!action || typeof action !== "string" || action.trim().length === 0) {
throw new McpError(
ErrorCode.InvalidParams,
"Action must be a non-empty string"
);
}
const validActions = ["get_url", "save_file"];
if (!validActions.includes(action)) {
throw new McpError(
ErrorCode.InvalidParams,
`Invalid action: ${action}. Valid actions are: ${validActions.join(", ")}`
);
}
}
function validateOutputPath(
outputPath: string | undefined,
action: string
): void {
if (
action === "save_file" &&
(!outputPath ||
typeof outputPath !== "string" ||
outputPath.trim().length === 0)
) {
throw new McpError(
ErrorCode.InvalidParams,
"Output path is required for save_file action"
);
}
}
function validatePackages(packages?: string): void {
if (packages !== undefined) {
if (typeof packages !== "string" || packages.trim().length === 0) {
throw new McpError(
ErrorCode.InvalidParams,
"Packages must be a non-empty string"
);
}
}
}
function validateDimensions(width?: number, height?: number): void {
if (width !== undefined) {
if (!Number.isInteger(width) || width <= 0 || width > 10000) {
throw new McpError(
ErrorCode.InvalidParams,
"Width must be a positive integer between 1 and 10000"
);
}
}
if (height !== undefined) {
if (!Number.isInteger(height) || height <= 0 || height > 10000) {
throw new McpError(
ErrorCode.InvalidParams,
"Height must be a positive integer between 1 and 10000"
);
}
}
}
function validateMapsApiKey(mapsApiKey?: string): void {
if (mapsApiKey !== undefined) {
if (typeof mapsApiKey !== "string" || mapsApiKey.trim().length === 0) {
throw new McpError(
ErrorCode.InvalidParams,
"Maps API key must be a non-empty string"
);
}
}
}
/**
* Fetches
*/
function buildGoogleChartsConfig(
code: string,
options: {
packages?: string;
width?: number;
height?: number;
mapsApiKey?: string;
} = {}
): any {
const config: any = {
code,
packages: options.packages || "corechart",
};
if (options.width !== undefined) config.width = options.width;
if (options.height !== undefined) config.height = options.height;
if (options.mapsApiKey) config.mapsApiKey = options.mapsApiKey;
return config;
}
function buildGoogleChartsUrl(code: string): string {
const encodedCode = encodeURIComponent(code);
return `${QuickChartUrls.googleCharts()}?code=${encodedCode}`;
}
async function fetchGoogleChartsContent(
postConfig: any,
format: string = "png"
): Promise<any> {
const axiosConfig = {
responseType: "arraybuffer" as any,
timeout: 30000,
headers: {
"Content-Type": "application/json",
"User-Agent":
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36",
Accept: "image/*,*/*",
"Accept-Language": "en-US,en;q=0.9",
"Accept-Encoding": "gzip, deflate, br",
Connection: "keep-alive",
},
validateStatus: (status: number) => status >= 200 && status < 300,
};
try {
const response = await axios.post(
QuickChartUrls.googleCharts(),
postConfig,
axiosConfig
);
return response.data;
} catch (error) {
const axiosError = error as any;
const message = axiosError.response
? `Failed to fetch Google Charts content from QuickChart - Status: ${axiosError.response.status}`
: `Failed to fetch Google Charts content from QuickChart - ${axiosError.message}`;
throw new McpError(ErrorCode.InternalError, message);
}
}
/**
* Tool handler
*/
export async function handleGoogleChartsTool(args: any): Promise<any> {
const code = args.code as string;
const action = args.action as string;
validateCode(code);
validateAction(action);
validateOutputPath(args.outputPath, action);
validatePackages(args.packages);
validateDimensions(args.width, args.height);
validateMapsApiKey(args.mapsApiKey);
const postConfig = buildGoogleChartsConfig(code, {
packages: args.packages as string,
width: args.width as number,
height: args.height as number,
mapsApiKey: args.mapsApiKey as string,
});
const chartUrl = buildGoogleChartsUrl(code);
const result: any = {
content: [
{
type: "text",
text: "Below is the chart URL:",
},
{
type: "text",
text: chartUrl,
},
],
metadata: {
chartType: args.packages || "corechart",
generatedAt: new Date().toISOString(),
chartUrl: chartUrl,
},
};
try {
const pngData = await fetchGoogleChartsContent(postConfig, "png");
const pngBase64 = Buffer.from(pngData).toString("base64");
result.content.push(
{
type: "text",
text: "Below is the PNG image:",
},
{
type: "image",
data: pngBase64,
mimeType: "image/png",
}
);
result.metadata.pngBase64 = pngBase64;
} catch (error) {
result.content.unshift({
type: "text",
text: "⚠️ Failed to fetch chart image",
});
result.content.push({
type: "text",
text: `Error: ${error instanceof Error ? error.message : String(error)}`,
});
result.metadata.error =
error instanceof Error ? error.message : String(error);
}
if (action === "get_url") {
return result;
}
const format = "png";
const outputPath = getDownloadPath(
args.outputPath as string | undefined,
format
);
try {
const dir = path.dirname(outputPath);
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, { recursive: true });
}
const data = await fetchGoogleChartsContent(postConfig, format);
fs.writeFileSync(outputPath, data);
result.metadata.savedPath = outputPath;
result.content.push({
type: "text",
text: "Below is the saved file path:",
});
result.content.push({
type: "text",
text: outputPath,
});
return result;
} catch (error) {
throw new McpError(
ErrorCode.InternalError,
`Failed to save chart: ${
error instanceof Error ? error.message : String(error)
}`
);
}
}