MCP Image Extractor
by ifmelate
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- mcp-image-extractor
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<h1><a href="index.html">All files</a> image-utils.ts</h1>
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<div class='fl pad1y space-right2'>
<span class="strong">64.46% </span>
<span class="quiet">Statements</span>
<span class='fraction'>78/121</span>
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<div class='fl pad1y space-right2'>
<span class="strong">45.83% </span>
<span class="quiet">Branches</span>
<span class='fraction'>33/72</span>
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<div class='fl pad1y space-right2'>
<span class="strong">80% </span>
<span class="quiet">Functions</span>
<span class='fraction'>4/5</span>
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<div class='fl pad1y space-right2'>
<span class="strong">64.46% </span>
<span class="quiet">Lines</span>
<span class='fraction'>78/121</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import axios from 'axios';
import sharp from 'sharp';
import * as fs from 'fs';
import * as path from 'path';
// Configuration
const MAX_IMAGE_SIZE = parseInt(process.env.MAX_IMAGE_SIZE || '10485760', 10); // 10MB default
const ALLOWED_DOMAINS = process.env.ALLOWED_DOMAINS ? <span class="branch-0 cbranch-no" title="branch not covered" >process.env.ALLOWED_DOMAINS.split(',') </span>: [];
// Default max dimensions for optimal LLM context usage
const DEFAULT_MAX_WIDTH = 512;
const DEFAULT_MAX_HEIGHT = 512;
// Compression configuration based on format - new addition
type SupportedFormat = 'jpeg' | 'jpg' | 'png' | 'webp' | 'gif' | 'svg' | 'avif' | 'tiff';
const COMPRESSION_OPTIONS: Record<SupportedFormat, object> = {
jpeg: { quality: 80 },
jpg: { quality: 80 },
png: { quality: 80, compressionLevel: 9 },
webp: { quality: 80 },
gif: { },
svg: { },
avif: { quality: 80 },
tiff: { quality: 80 }
};
// Type definitions
export type ExtractImageFromFileParams = {
file_path: string;
resize: boolean;
max_width: number;
max_height: number;
};
export type ExtractImageFromUrlParams = {
url: string;
resize: boolean;
max_width: number;
max_height: number;
};
export type ExtractImageFromBase64Params = {
base64: string;
mime_type: string;
resize: boolean;
max_width: number;
max_height: number;
};
// MCP SDK expects this specific format for tool responses
export type McpToolResponse = {
[x: string]: unknown;
content: (
| { [x: string]: unknown; type: "text"; text: string; }
| { [x: string]: unknown; type: "image"; data: string; mimeType: string; }
| {
[x: string]: unknown;
type: "resource";
resource: {
[x: string]: unknown;
text: string;
uri: string;
mimeType?: string;
} | {
[x: string]: unknown;
uri: string;
blob: string;
mimeType?: string;
};
}
)[];
_meta?: Record<string, unknown>;
isError?: boolean;
};
// Helper function to compress image based on format
async function compressImage(imageBuffer: Buffer, formatStr: string): Promise<Buffer> {
const sharpInstance = sharp(imageBuffer);
const format = formatStr.toLowerCase() as SupportedFormat;
// Check if format is supported
if (format in COMPRESSION_OPTIONS) {
const options = COMPRESSION_OPTIONS[format];
// Use specific methods based on format
switch (format) {
case 'jpeg':
case 'jpg':
return await sharpInstance.jpeg(options as any).toBuffer();
case 'png':
return await sharpInstance.png(options as any).toBuffer();
<span class="branch-3 cbranch-no" title="branch not covered" > case 'webp':</span>
<span class="cstat-no" title="statement not covered" > return await sharpInstance.webp(options as any).toBuffer();</span>
<span class="branch-4 cbranch-no" title="branch not covered" > case 'avif':</span>
<span class="cstat-no" title="statement not covered" > return await sharpInstance.avif(options as any).toBuffer();</span>
<span class="branch-5 cbranch-no" title="branch not covered" > case 'tiff':</span>
<span class="cstat-no" title="statement not covered" > return await sharpInstance.tiff(options as any).toBuffer();</span>
// For formats without specific compression options
<span class="branch-6 cbranch-no" title="branch not covered" > case 'gif':</span>
<span class="branch-7 cbranch-no" title="branch not covered" > case 'svg':</span>
<span class="cstat-no" title="statement not covered" > return await sharpInstance.toBuffer();</span>
}
}
// Default to jpeg if format not supported
<span class="cstat-no" title="statement not covered" > return await sharpInstance.jpeg(COMPRESSION_OPTIONS.jpeg as any).toBuffer();</span>
}
// Extract image from file
export async function extractImageFromFile(params: ExtractImageFromFileParams): Promise<McpToolResponse> {
try {
const { file_path, resize, max_width, max_height } = params;
// Check if file exists
<span class="missing-if-branch" title="if path not taken" >I</span>if (!fs.existsSync(file_path)) {
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: File ${file_path} does not exist` }],
isError: true
};
}
// Read file
let imageBuffer = fs.readFileSync(file_path);
// Check size
<span class="missing-if-branch" title="if path not taken" >I</span>if (imageBuffer.length > MAX_IMAGE_SIZE) {
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: Image size exceeds maximum allowed size of ${MAX_IMAGE_SIZE} bytes` }],
isError: true
};
}
// Process the image
let metadata = await sharp(imageBuffer).metadata();
// Always resize to ensure the base64 representation is reasonable
// This will help avoid consuming too much of the context window
if (metadata.width && metadata.height) {
// Use provided dimensions or fallback to defaults for optimal LLM context usage
const targetWidth = Math.min(metadata.width, DEFAULT_MAX_WIDTH);
const targetHeight = Math.min(metadata.height, DEFAULT_MAX_HEIGHT);
// Only resize if needed
if (metadata.width > targetWidth || <span class="branch-1 cbranch-no" title="branch not covered" >metadata.height > targetHeight)</span> {
imageBuffer = await sharp(imageBuffer)
.resize({
width: targetWidth,
height: targetHeight,
fit: 'inside',
withoutEnlargement: true
})
.toBuffer();
// Update metadata after resize
metadata = await sharp(imageBuffer).metadata();
}
}
// Determine mime type based on file extension
const fileExt = path.extname(file_path).toLowerCase();
let mimeType = 'image/jpeg';
let format = 'jpeg';
if (fileExt === '.png') {
mimeType = 'image/png';
format = 'png';
}
else if (fileExt === '.jpg' || fileExt === '.jpeg') {
mimeType = 'image/jpeg';
format = 'jpeg';
}
else <span class="missing-if-branch" title="if path not taken" >I</span>if (fileExt === '.gif') {
<span class="cstat-no" title="statement not covered" > mimeType = 'image/gif';</span>
<span class="cstat-no" title="statement not covered" > format = 'gif';</span>
}
else <span class="missing-if-branch" title="if path not taken" >I</span>if (fileExt === '.webp') {
<span class="cstat-no" title="statement not covered" > mimeType = 'image/webp';</span>
<span class="cstat-no" title="statement not covered" > format = 'webp';</span>
}
else <span class="missing-if-branch" title="if path not taken" >I</span>if (fileExt === '.svg') {
<span class="cstat-no" title="statement not covered" > mimeType = 'image/svg+xml';</span>
<span class="cstat-no" title="statement not covered" > format = 'svg';</span>
}
else <span class="missing-if-branch" title="if path not taken" >I</span>if (fileExt === '.avif') {
<span class="cstat-no" title="statement not covered" > mimeType = 'image/avif';</span>
<span class="cstat-no" title="statement not covered" > format = 'avif';</span>
}
// Compress the image based on its format
try {
imageBuffer = await compressImage(imageBuffer, format);
} catch (compressionError) {
console.warn('Compression warning, using original image:', compressionError);
// Continue with the original image if compression fails
}
// Convert to base64
const base64 = imageBuffer.toString('base64');
// Return both text and image content
return {
content: [
{
type: "text",
text: JSON.stringify({
width: metadata.width,
height: metadata.height,
format: metadata.format,
size: imageBuffer.length
})
},
{
type: "image",
data: base64,
mimeType: mimeType
}
]
};
} catch (error: unknown) {
<span class="cstat-no" title="statement not covered" > console.error('Error processing image file:', error);</span>
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: ${error instanceof Error ? error.message : String(error)}` }],
isError: true
};
}
}
// Extract image from URL
export async function extractImageFromUrl(params: ExtractImageFromUrlParams): Promise<McpToolResponse> {
try {
const { url, resize, max_width, max_height } = params;
// Validate URL
if (!url.startsWith('http://') && !url.startsWith('https://')) {
return {
content: [{ type: "text", text: "Error: URL must start with http:// or https://" }],
isError: true
};
}
// Domain validation if ALLOWED_DOMAINS is set
<span class="missing-if-branch" title="if path not taken" >I</span>if (ALLOWED_DOMAINS.length > 0) {
const urlObj = <span class="cstat-no" title="statement not covered" >new URL(url);</span>
const domain = <span class="cstat-no" title="statement not covered" >urlObj.hostname;</span>
const isAllowed = <span class="cstat-no" title="statement not covered" >ALLOWED_DOMAINS.some(<span class="fstat-no" title="function not covered" >(a</span>llowedDomain: string) => </span>
<span class="cstat-no" title="statement not covered" > domain === allowedDomain || domain.endsWith(`.${allowedDomain}`)</span>
);
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (!isAllowed) {</span>
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: Domain ${domain} is not in the allowed domains list` }],
isError: true
};
}
}
// Fetch the image
const response = await axios.get(url, {
responseType: 'arraybuffer',
maxContentLength: MAX_IMAGE_SIZE,
});
// Process the image
let imageBuffer = <span class="cstat-no" title="statement not covered" >Buffer.from(response.data);</span>
let metadata = <span class="cstat-no" title="statement not covered" >await sharp(imageBuffer).metadata();</span>
// Always resize to ensure the base64 representation is reasonable
// This will help avoid consuming too much of the context window
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (metadata.width && metadata.height) {</span>
// Use provided dimensions or fallback to defaults for optimal LLM context usage
const targetWidth = <span class="cstat-no" title="statement not covered" >Math.min(metadata.width, DEFAULT_MAX_WIDTH);</span>
const targetHeight = <span class="cstat-no" title="statement not covered" >Math.min(metadata.height, DEFAULT_MAX_HEIGHT);</span>
// Only resize if needed
<span class="cstat-no" title="statement not covered" > <span class="missing-if-branch" title="if path not taken" >I</span>if (metadata.width > targetWidth || metadata.height > targetHeight) {</span>
<span class="cstat-no" title="statement not covered" > imageBuffer = await sharp(imageBuffer)</span>
.resize({
width: targetWidth,
height: targetHeight,
fit: 'inside',
withoutEnlargement: true
})
.toBuffer();
// Update metadata after resize
<span class="cstat-no" title="statement not covered" > metadata = await sharp(imageBuffer).metadata();</span>
}
}
// Compress the image based on its format
<span class="cstat-no" title="statement not covered" > try {</span>
const format = <span class="cstat-no" title="statement not covered" >metadata.format || 'jpeg';</span>
<span class="cstat-no" title="statement not covered" > imageBuffer = await compressImage(imageBuffer, format);</span>
} catch (compressionError) {
<span class="cstat-no" title="statement not covered" > console.warn('Compression warning, using original image:', compressionError);</span>
// Continue with the original image if compression fails
}
// Convert to base64
const base64 = <span class="cstat-no" title="statement not covered" >imageBuffer.toString('base64');</span>
const mimeType = <span class="cstat-no" title="statement not covered" >response.headers['content-type'] || 'image/jpeg';</span>
// Return both text and image content
<span class="cstat-no" title="statement not covered" > return {</span>
content: [
{
type: "text",
text: JSON.stringify({
width: metadata.width,
height: metadata.height,
format: metadata.format,
size: imageBuffer.length
})
},
{
type: "image",
data: base64,
mimeType: mimeType
}
]
};
} catch (error: unknown) {
console.error('Error processing image from URL:', error);
return {
content: [{ type: "text", text: `Error: ${error instanceof Error ? error.message : <span class="branch-1 cbranch-no" title="branch not covered" >String(error)}</span>` }],
isError: true
};
}
}
// Extract image from base64
export async function extractImageFromBase64(params: ExtractImageFromBase64Params): Promise<McpToolResponse> {
try {
const { base64, mime_type, resize, max_width, max_height } = params;
// Decode base64
let imageBuffer;
try {
imageBuffer = Buffer.from(base64, 'base64');
// Quick validation - valid base64 strings should be decodable
<span class="missing-if-branch" title="if path not taken" >I</span>if (imageBuffer.length === 0) {
<span class="cstat-no" title="statement not covered" > throw new Error("Invalid base64 string - decoded to empty buffer");</span>
}
} catch (e) {
return {
content: [{ type: "text", text: `Error: Invalid base64 string - ${e instanceof Error ? e.message : <span class="branch-1 cbranch-no" title="branch not covered" >String(e)}</span>` }],
isError: true
};
}
// Check size
<span class="missing-if-branch" title="if path not taken" >I</span>if (imageBuffer.length > MAX_IMAGE_SIZE) {
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: Image size exceeds maximum allowed size of ${MAX_IMAGE_SIZE} bytes` }],
isError: true
};
}
// Process the image
let metadata;
try {
metadata = await sharp(imageBuffer).metadata();
} catch (e) {
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: Could not process image data - ${e instanceof Error ? e.message : String(e)}` }],
isError: true
};
}
// Always resize to ensure the base64 representation is reasonable
// This will help avoid consuming too much of the context window
if (metadata.width && metadata.height) {
// Use provided dimensions or fallback to defaults for optimal LLM context usage
const targetWidth = Math.min(metadata.width, DEFAULT_MAX_WIDTH);
const targetHeight = Math.min(metadata.height, DEFAULT_MAX_HEIGHT);
// Only resize if needed
if (metadata.width > targetWidth || <span class="branch-1 cbranch-no" title="branch not covered" >metadata.height > targetHeight)</span> {
imageBuffer = await sharp(imageBuffer)
.resize({
width: targetWidth,
height: targetHeight,
fit: 'inside',
withoutEnlargement: true
})
.toBuffer();
// Update metadata after resize
metadata = await sharp(imageBuffer).metadata();
}
}
// Compress the image based on its format
try {
const format = metadata.format || mime_type.split('/')[1] || <span class="branch-2 cbranch-no" title="branch not covered" >'jpeg';</span>
imageBuffer = await compressImage(imageBuffer, format);
} catch (compressionError) {
console.warn('Compression warning, using original image:', compressionError);
// Continue with the original image if compression fails
}
// Convert back to base64
const processedBase64 = imageBuffer.toString('base64');
// Return both text and image content
return {
content: [
{
type: "text",
text: JSON.stringify({
width: metadata.width,
height: metadata.height,
format: metadata.format,
size: imageBuffer.length
})
},
{
type: "image",
data: processedBase64,
mimeType: mime_type
}
]
};
} catch (error: unknown) {
<span class="cstat-no" title="statement not covered" > console.error('Error processing base64 image:', error);</span>
<span class="cstat-no" title="statement not covered" > return {</span>
content: [{ type: "text", text: `Error: ${error instanceof Error ? error.message : String(error)}` }],
isError: true
};
}
} </pre></td></tr></table></pre>
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