From c74fad179379260dcf46edeae22c1f04ee842508 Mon Sep 17 00:00:00 2001
From: Ashelyn Rose <git@tempest.dev>
Date: Sat, 2 Dec 2023 16:29:03 -0700
Subject: Manual static image optimization

---
 components/Image/index.tsx | 108 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 components/Image/index.tsx

(limited to 'components/Image/index.tsx')

diff --git a/components/Image/index.tsx b/components/Image/index.tsx
new file mode 100644
index 0000000..e7a393c
--- /dev/null
+++ b/components/Image/index.tsx
@@ -0,0 +1,108 @@
+import { promises as fs } from 'fs'
+import path from 'path'
+import { ImgHTMLAttributes } from 'react'
+import sharp from 'sharp'
+
+const outputDir = path.join(process.cwd(), '.next/static/images')
+const serverPath = '/_next/static/images/'
+
+interface ReqProps {
+  src: string,
+  alt: string,
+}
+
+type FixedSingleDimension = {width: number} | {height: number}
+type FixedBothDimension = {width: number, height: number}
+type MultiSize = {width: number[]} | {height: number[]}
+type SizeProps = FixedSingleDimension | FixedBothDimension | MultiSize
+type ImageAttrs = Omit<ImgHTMLAttributes<HTMLImageElement>, "width" | "height" | "src"> 
+
+type ImageProps = ImageAttrs
+  & SizeProps
+  & ReqProps 
+
+interface ProcessedImage {
+  hostPath: string,
+  randPrefix: string,
+  widths: {[width: number] : string}
+}
+
+async function ImageServer({src,...imgAttrs}: ImageProps) {
+  const srcImg = sharp(src)
+  const extension = path.extname(src)
+  const filename = path.basename(src, extension)
+  const randPrefix = (Math.random() + 1).toString(36).substring(7)
+  const width = 'width' in imgAttrs ? imgAttrs.width : null
+  const height = 'height' in imgAttrs ? imgAttrs.height : null
+
+  console.log(`processing ${src} for width ${width} and height ${height}`)
+
+  // Make sure we can write to the dir
+  await fs.mkdir(outputDir, {recursive: true})
+
+  // Handle where we have an array of dimensions
+  if (Array.isArray(width) || Array.isArray(height)) {
+    const dimension = Array.isArray(width) ? 'width' : 'height'
+    const sizes = Array.isArray(width) ? width : height as number[]
+    const suffix = dimension.charAt(0)
+
+    // Copy in original
+    fs.copyFile(src, path.join(outputDir, `${randPrefix}-${filename}${extension}`))
+
+    // Create resized copies
+    const srcSetLines = await Promise.all(sizes
+      .map(async size => {
+        const outputName = `${randPrefix}-${filename}-${size}${suffix}${extension}`
+        const outputPath = path.join(outputDir, outputName)
+        return srcImg
+          .resize({[dimension]: size})
+          .toFile(outputPath)
+          .then(result => `${serverPath}${outputName} ${result.width}w`)
+      }))
+
+    return (
+      <img
+        src={src}
+        srcSet={srcSetLines.join(',')}
+        {...imgAttrs}
+        width={undefined}
+        height={undefined}
+      />
+    )
+  } else {
+    const dimensions = {
+      width: typeof width === 'number' ? width : undefined,
+      height: typeof height === 'number' ? height : undefined
+    }
+
+    const dimensionString = (() => {
+      if (dimensions.height && dimensions.height)
+        return `${dimensions.width}x${dimensions.height}`
+      if (dimensions.width)
+        return `${dimensions.width}w`
+      return `${dimensions.height}h`
+    })()
+
+    const outputName = `${randPrefix}-${filename}-${dimensionString}${extension}`
+    const outputPath = path.join(outputDir, outputName)
+    const outputSrc =   serverPath + outputName
+    await srcImg.resize(dimensions).toFile(outputPath)
+
+    return (
+      <img
+        src={outputSrc}
+        {...imgAttrs}
+        {...dimensions}
+      />
+    )
+  }
+}
+
+export default function ImageServerWrap(props: ImageProps) {
+  return (
+    <>
+      {/* @ts-expect-error Async Server Component */}
+      <ImageServer {...props} />
+    </>
+  )
+}
-- 
cgit 1.4.1

