Add support for Blossom uploader

src/config.ts

@@ -140,6 +140,10 @@ class Conf {
   static get nostrbuildEndpoint(): string {
     return Deno.env.get('NOSTRBUILD_ENDPOINT') || 'https://nostr.build/api/v2/upload/files';
   }
+  /** Default Blossom servers to use when the `blossom` uploader is set. */
+  static get blossomServers(): string[] {
+    return Deno.env.get('BLOSSOM_SERVERS')?.split(',') || ['https://blossom.primal.net/'];
+  }
   /** Module to upload files with. */
   static get uploader() {
     return Deno.env.get('DITTO_UPLOADER');

src/middleware/uploaderMiddleware.ts

@@ -1,3 +1,5 @@
+import { BlossomUploader } from '@nostrify/nostrify/uploaders';
+
 import { AppMiddleware } from '@/app.ts';
 import { Conf } from '@/config.ts';
 import { DenoUploader } from '@/uploaders/DenoUploader.ts';
@@ -8,6 +10,8 @@ import { fetchWorker } from '@/workers/fetch.ts';
 
 /** Set an uploader for the user. */
 export const uploaderMiddleware: AppMiddleware = async (c, next) => {
+  const signer = c.get('signer');
+
   switch (Conf.uploader) {
     case 's3':
       c.set('uploader', new S3Uploader(Conf.s3));
@@ -21,6 +25,11 @@ export const uploaderMiddleware: AppMiddleware = async (c, next) => {
     case 'nostrbuild':
       c.set('uploader', new NostrBuildUploader({ endpoint: Conf.nostrbuildEndpoint, fetch: fetchWorker }));
       break;
+    case 'blossom':
+      if (signer) {
+        c.set('uploader', new BlossomUploader({ servers: Conf.blossomServers, signer, fetch: fetchWorker }));
+      }
+      break;
   }
 
   await next();