@nanggo/social-preview
Version:
Generate beautiful social media preview images from any URL
103 lines (102 loc) • 5.08 kB
JavaScript
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var __importStar = (this && this.__importStar) || (function () {
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})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.processImageForTemplate = processImageForTemplate;
const validators_1 = require("../utils/validators");
const logger_1 = require("../utils/logger");
const image_security_1 = require("../utils/image-security");
const metadata_extractor_1 = require("./metadata-extractor");
const image_generator_1 = require("./image-generator");
// Pre-load image security module at module level for performance
const imageSecurityPromise = Promise.resolve().then(() => __importStar(require('../utils/image-security')));
async function processImageForTemplate(metadata, template, width, height, options) {
// Check if template wants no background image
if (template.layout.imagePosition === 'none') {
// Use transparent canvas if template requires it, otherwise use blank canvas
if (template.imageProcessing?.requiresTransparentCanvas) {
return (0, validators_1.createTransparentCanvas)(width, height);
}
return await (0, image_generator_1.createBlankCanvas)(width, height, options);
}
// If no image available, handle based on template configuration
if (!metadata.image) {
// Use transparent canvas if template requires it for custom backgrounds
if (template.imageProcessing?.requiresTransparentCanvas) {
return (0, validators_1.createTransparentCanvas)(width, height);
}
return await (0, image_generator_1.createBlankCanvas)(width, height, options);
}
// Process background image with template-specific effects
try {
const imageBuffer = await (0, metadata_extractor_1.fetchImage)(metadata.image, options.security);
// Use withSecureSharp for automatic pool management
const { withSecureSharp } = await imageSecurityPromise;
return await withSecureSharp(imageBuffer, async (secureImage) => {
let processedImage = (0, image_security_1.secureResize)(secureImage, width, height, {
fit: 'cover',
position: 'center',
});
// Apply template-specific effects in optimized pipeline
const blurRadius = template.effects?.blur?.radius ?? 0;
const brightnessValue = template.imageProcessing?.brightness ?? 1.0;
const saturationValue = template.imageProcessing?.saturation;
// Apply blur first if needed
if (blurRadius > 0) {
processedImage = processedImage.blur(blurRadius);
}
// Apply brightness and saturation together for efficiency
if (brightnessValue !== 1.0 || saturationValue !== undefined) {
const modulateOptions = {};
if (brightnessValue !== 1.0) {
modulateOptions.brightness = brightnessValue;
}
if (saturationValue !== undefined) {
modulateOptions.saturation = saturationValue;
}
processedImage = processedImage.modulate(modulateOptions);
}
return processedImage;
});
}
catch (fetchError) {
// If image fetch fails, create appropriate canvas based on template configuration
(0, logger_1.logImageFetchError)(metadata.image, fetchError instanceof Error ? fetchError : new Error(String(fetchError)));
// Use transparent canvas if template requires it for custom backgrounds
if (template.imageProcessing?.requiresTransparentCanvas) {
return (0, validators_1.createTransparentCanvas)(width, height);
}
return await (0, image_generator_1.createBlankCanvas)(width, height, options);
}
}