split off nip94 metadata stuff into its own file, port changes to s3uploader

src/interfaces/Nip94Metadata.ts

@@ -0,0 +1,31 @@
+/**
+ * Required fields of NIP-94 metadata for images.
+ * Contains the following fields:
+ * * `url` - required, the URL to of the file
+ * * `m` - required, the file mimetype.
+ */
+export type Nip94MetadataRequired = Record<'url' | 'm', string>;
+
+/**
+ * Optional fields of NIP-94 metadata for images.
+ * Contains the following fields:
+ * * `x` - sha-256 hash
+ * * `ox` - sha-256 hash
+ * * `dim` - image dimensions in ${w}x${h} format
+ * * `blurhash` - the blurhash for the image. useful for image previews etc
+ * * `cid` - the ipfs cid of the image.
+ */
+export type Nip94MetadataOptional = Partial<Record<'x' | 'ox' | 'size' | 'dim' | 'blurhash' | 'cid', string>>;
+
+/**
+ * NIP-94 metadata for images.
+ * Contains the following fields:
+ * * `url` - required, the URL to of the file
+ * * `m` - required, the file mimetype.
+ * * `x` - sha-256 hash
+ * * `ox` - sha-256 hash
+ * * `dim` - image dimensions in ${w}x${h} format
+ * * `blurhash` - the blurhash for the image. useful for image previews etc
+ * * `cid` - the ipfs cid of the image.
+ */
+export type Nip94Metadata = Nip94MetadataOptional & Nip94MetadataRequired;

src/uploaders/IPFSUploader.ts

@@ -1,11 +1,6 @@
 import { NUploader } from '@nostrify/nostrify';
 import { z } from 'zod';
-import sharp from 'sharp';
-import { Stickynotes } from '@soapbox/stickynotes';
-import { encode } from 'blurhash';
-import { encodeHex } from '@std/encoding/hex';
-
-const console = new Stickynotes('ditto:uploader:ipfs');
+import { getOptionalNip94Metadata } from '@/utils/image-metadata.ts';
 
 export interface IPFSUploaderOpts {
   baseUrl: string;
@@ -13,22 +8,6 @@ export interface IPFSUploaderOpts {
   fetch?: typeof fetch;
 }
 
-function toByteArray(f: File): Promise<Uint8Array> {
-  return new Promise((resolve, reject) => {
-    const reader = new FileReader();
-    reader.addEventListener('loadend', (m) => {
-      if (m?.target?.result instanceof ArrayBuffer) {
-        resolve(new Uint8Array(m.target.result));
-      } else reject('Error loading file: readAsArrayBufferFailed');
-    });
-    reader.addEventListener('error', (e) => reject(e));
-    reader.readAsArrayBuffer(f);
-  });
-}
-type Nip94Metadata =
-  & Record<'url' | 'm', string>
-  & Partial<Record<'x' | 'ox' | 'size' | 'dim' | 'blurhash' | 'cid', string>>;
-
 /**
  * IPFS uploader. It expects an IPFS node up and running.
  * It will try to connect to `http://localhost:5001` by default,
@@ -58,44 +37,14 @@ export class IPFSUploader implements NUploader {
     });
 
     const { Hash: cid } = IPFSUploader.schema().parse(await response.json());
-    const tags: Nip94Metadata = {
+
+    return Object.entries({
       url: new URL(`/ipfs/${cid}`, this.baseUrl).toString(),
       m: file.type,
       cid,
       size: file.size.toString(),
-    };
-
-    try {
-      const buffer = await toByteArray(file);
-      const hash = await crypto.subtle.digest('SHA-256', buffer).then(encodeHex);
-      tags.x = tags.ox = hash;
-      const img = sharp(buffer);
-      const metadata = await img.metadata();
-
-      if (metadata.width && metadata.height) {
-        tags.dim = `${metadata.width}x${metadata.height}`;
-        const pixels = await img
-          .raw()
-          .ensureAlpha()
-          .toBuffer({ resolveWithObject: true })
-          .then((buf) => {
-            return new Uint8ClampedArray(buf.data);
-          });
-        tags.blurhash = encode(
-          pixels,
-          metadata.width,
-          metadata.height,
-          // sane default from https://github.com/woltapp/blurhash readme
-          4,
-          4,
-        );
-      }
-    } catch (e) {
-      console.error(`Error parsing ipfs metadata: ${e}`);
-    }
-
-    console.debug(tags);
-    return Object.entries(tags) as [['url', string], ...string[][]];
+      ...await getOptionalNip94Metadata(file),
+    }) as [['url', string], ...string[][]];
   }
 
   async delete(cid: string, opts?: { signal?: AbortSignal }): Promise<void> {

src/uploaders/S3Uploader.ts

@@ -7,6 +7,7 @@ import { encodeHex } from '@std/encoding/hex';
 import { extensionsByType } from '@std/media-types';
 
 import { Conf } from '@/config.ts';
+import { getOptionalNip94Metadata } from '@/utils/image-metadata.ts';
 
 export interface S3UploaderOpts {
   endPoint: string;
@@ -45,12 +46,12 @@ export class S3Uploader implements NUploader {
     const path = (pathStyle && bucket) ? join(bucket, filename) : filename;
     const url = new URL(path, Conf.mediaDomain).toString();
 
-    return [
-      ['url', url],
-      ['m', file.type],
-      ['x', sha256],
-      ['size', file.size.toString()],
-    ];
+    return Object.entries({
+      url: url,
+      m: file.type,
+      size: file.size.toString(),
+      ...await getOptionalNip94Metadata(file),
+    }) as [['url', string], ...string[][]];
   }
 
   async delete(objectName: string) {

src/utils/image-metadata.ts

@@ -0,0 +1,54 @@
+import sharp from 'sharp';
+import { encode } from 'blurhash';
+import { encodeHex } from '@std/encoding/hex';
+import type { Nip94MetadataOptional } from '@/interfaces/Nip94Metadata.ts';
+import { Stickynotes } from '@soapbox/stickynotes';
+
+const console = new Stickynotes('ditto:uploaders');
+
+function toByteArray(f: File): Promise<Uint8Array> {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.addEventListener('loadend', (m) => {
+      if (m?.target?.result instanceof ArrayBuffer) {
+        resolve(new Uint8Array(m.target.result));
+      } else reject('Error loading file: readAsArrayBufferFailed');
+    });
+    reader.addEventListener('error', (e) => reject(e));
+    reader.readAsArrayBuffer(f);
+  });
+}
+
+export async function getOptionalNip94Metadata(f: File): Promise<Nip94MetadataOptional> {
+  const tags: Nip94MetadataOptional = {};
+  try {
+    const buffer = await toByteArray(f);
+    const hash = await crypto.subtle.digest('SHA-256', buffer).then(encodeHex);
+    tags.x = tags.ox = hash;
+    const img = sharp(buffer);
+    const metadata = await img.metadata();
+
+    if (metadata.width && metadata.height) {
+      tags.dim = `${metadata.width}x${metadata.height}`;
+      const pixels = await img
+        .raw()
+        .ensureAlpha()
+        .toBuffer({ resolveWithObject: true })
+        .then((buf) => {
+          return new Uint8ClampedArray(buf.data);
+        });
+      tags.blurhash = encode(
+        pixels,
+        metadata.width,
+        metadata.height,
+        // sane default from https://github.com/woltapp/blurhash readme
+        4,
+        4,
+      );
+    }
+  } catch (e) {
+    console.error(`Error parsing ipfs metadata: ${e}`);
+  }
+
+  return tags;
+}