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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| import type { NextApiRequest, NextApiResponse } from 'next'; | ||
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| import { createCanvas, CanvasRenderingContext2D } from 'canvas'; | ||
| import sharp from 'sharp'; | ||
|
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||
| function wrapText( | ||
| context: CanvasRenderingContext2D, | ||
| text: string, | ||
| maxWidth: number, | ||
| ) { | ||
| const words = text.split(' '); | ||
| const lines: string[] = []; | ||
| let currentLine: string = words[0]; | ||
|
|
||
| for (let i = 1; i < words.length; i++) { | ||
| const word = words[i]; | ||
| const width = context.measureText(currentLine + ' ' + word).width; | ||
| if (width < maxWidth) { | ||
| currentLine += ' ' + word; | ||
| } else { | ||
| lines.push(currentLine); | ||
| currentLine = word; | ||
| } | ||
| } | ||
| lines.push(currentLine); // Push the last line | ||
| return lines; | ||
| } | ||
|
|
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| function cutAndAddEllipsis(text: string) { | ||
| const maxWidth = 125; | ||
| if (text.length <= maxWidth) { | ||
| return text; | ||
| } | ||
|
|
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| return text.substring(0, maxWidth) + '...'; | ||
| } | ||
|
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| export default async function handler( | ||
| req: NextApiRequest, | ||
| res: NextApiResponse, | ||
| ) { | ||
| // If there are missing parameters, return an error response | ||
| if (req.query.text == null || req.query.text == undefined) { | ||
| return res.status(400).json({ | ||
| status: 'error', | ||
| message: `Missing required query parameters: 'text'`, | ||
| }); | ||
| } | ||
|
|
||
| // Ensure text is a string | ||
| const requestText = req.query.text; | ||
| if (typeof requestText !== 'string') { | ||
| return res.status(400).json({ | ||
| status: 'error', | ||
| message: `Invalid type for 'text'. Expected a string.`, | ||
| }); | ||
| } | ||
|
|
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| try { | ||
| // Cut the text if needed and add an ellipsis | ||
| const text = cutAndAddEllipsis(requestText); | ||
| const fontSize = 48; | ||
|
|
||
| // Load the original image to get its dimensions | ||
| const originalImage = await sharp( | ||
| 'https://raw.githubusercontent.com/agustinustheo/sharp-canvas-ts/main/template.jpg', | ||
| ).metadata(); | ||
|
|
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| // Create a canvas that matches the original image's dimensions | ||
| const canvas = createCanvas(originalImage.width!, originalImage.height!); | ||
| const context = canvas.getContext('2d'); | ||
|
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| // Optional: Register a custom font | ||
| context.font = `${fontSize}px sans-serif`; | ||
| context.fillStyle = 'black'; // Text color | ||
| context.textAlign = 'left'; | ||
| context.textBaseline = 'top'; | ||
|
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| const maxWidth = originalImage.width! * 0.8; // Max width for the text | ||
| const lineHeight = fontSize * 1.2; // Line height | ||
| const lines = wrapText(context, text, maxWidth); | ||
| const textHeight = lines.length * lineHeight; // Calculate the total height of the text block | ||
|
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| // Calculate the starting Y position to center the text block | ||
| const startY = (originalImage.height! - textHeight) / 2; | ||
|
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| // Draw each line of text | ||
| lines.forEach((line, i) => { | ||
| const x = (originalImage.width! - context.measureText(line).width) / 2; // Center each line | ||
| const y = startY + i * lineHeight; | ||
| context.fillText(line, x, y); | ||
| }); | ||
|
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||
| // Convert the canvas to a Buffer | ||
| const textBuffer = canvas.toBuffer(); | ||
|
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| // Overlay the text image on the original image | ||
| const imageBuffer = await sharp( | ||
| 'https://raw.githubusercontent.com/agustinustheo/sharp-canvas-ts/main/template.jpg', | ||
| ) | ||
| .composite([{ input: textBuffer, blend: 'over' }]) | ||
| .png() | ||
| .toBuffer(); | ||
|
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| res.setHeader('Content-Type', 'image/png'); | ||
| res.send(imageBuffer); | ||
| } catch (error) { | ||
| console.error('Error:', error); | ||
| res.status(500).json({ status: 'error', message: 'Internal server error' }); | ||
| } | ||
| } |
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