update at 2026-02-08 22:31:25

apiserver/svg_to_png.js

@@ -0,0 +1,61 @@
+#!/usr/bin/env node
+
+const sharp = require('sharp')
+
+function parseArgs(argv) {
+  const parsed = {}
+  for (let i = 2; i < argv.length; i += 1) {
+    const key = argv[i]
+    const value = argv[i + 1]
+    if (key === '--width' && value) {
+      parsed.width = Number(value)
+      i += 1
+      continue
+    }
+    if (key === '--height' && value) {
+      parsed.height = Number(value)
+      i += 1
+    }
+  }
+  return parsed
+}
+
+async function main() {
+  const args = parseArgs(process.argv)
+  const chunks = []
+
+  process.stdin.on('data', (chunk) => {
+    chunks.push(chunk)
+  })
+
+  process.stdin.on('end', async () => {
+    try {
+      const svgBuffer = Buffer.concat(chunks)
+      if (!svgBuffer.length) {
+        throw new Error('empty svg input')
+      }
+
+      const width = Number.isFinite(args.width) && args.width > 0 ? Math.round(args.width) : null
+      const height = Number.isFinite(args.height) && args.height > 0 ? Math.round(args.height) : null
+
+      let pipeline = sharp(svgBuffer, { density: 300 })
+      if (width || height) {
+        pipeline = pipeline.resize({
+          width: width || undefined,
+          height: height || undefined,
+          fit: 'contain',
+          background: { r: 255, g: 255, b: 255, alpha: 1 },
+          withoutEnlargement: false,
+        })
+      }
+
+      const pngBuffer = await pipeline.png({ compressionLevel: 9 }).toBuffer()
+      process.stdout.write(pngBuffer)
+    } catch (error) {
+      process.stderr.write(`svg_to_png_error: ${error && error.message ? error.message : String(error)}\n`)
+      process.exit(1)
+    }
+  })
+}
+
+main()