Add algorithm param to Signature header

Author: dahlia

CHANGES.md

@@ -55,6 +55,10 @@ To be released.
      -  Deprecated `VerifyOptions` interface.  Use `VerifyRequestOptions`
         instead.
 
+ -  When signing an HTTP request, the `algorithm` parameter is now added to
+    the `Signature` header.  This change improves the compatibility with
+    Misskey and other implementations that require the `algorithm` parameter.
+
  -  Added more log messages using the [LogTape] library.  Currently the below
     logger categories are used:
 

cli/inbox.tsx

@@ -95,6 +95,7 @@ export const command = new Command()
           { handle: "i" },
           actor,
           new Follow({
+            id: new URL(`#follows/${actor.id?.href}`, fedCtx.getActorUri("i")),
             actor: fedCtx.getActorUri("i"),
             object: actor.id,
           }),

sig/http.ts

@@ -53,7 +53,7 @@ export async function signRequest(
     privateKey,
     new TextEncoder().encode(message),
   );
-  const sigHeader = `keyId="${keyId.href}",headers="${
+  const sigHeader = `keyId="${keyId.href}",algorithm="rsa-sha256",headers="${
     headerNames.join(" ")
   }",signature="${encodeBase64(signature)}"`;
   headers.set("Signature", sigHeader);