signedFetch more generic/configurable aligning it with fetch api

src/keri/app/clienting.ts

@@ -1,16 +1,17 @@
-import { Agent, Controller } from './controller';
-import { Tier } from '../core/salter';
 import { Authenticater } from '../core/authing';
+import { HEADER_SIG_TIME } from '../core/httping';
 import { ExternalModule, KeyManager } from '../core/keeping';
+import { Tier } from '../core/salter';
 
 import { Identifier } from './aiding';
 import { Contacts, Challenges } from './contacting';
+import { Agent, Controller } from './controller';
 import { Oobis, Operations, KeyEvents, KeyStates } from './coring';
 import { Credentials, Ipex, Registries, Schemas } from './credentialing';
-import { Notifications } from './notifying';
 import { Escrows } from './escrowing';
-import { Groups } from './grouping';
 import { Exchanges } from './exchanging';
+import { Groups } from './grouping';
+import { Notifications } from './notifying';
 
 const DEFAULT_BOOT_URL = 'http://localhost:3903';
 
@@ -176,7 +177,7 @@ export class SignifyClient {
 
         headers.set('Signify-Resource', this.controller.pre);
         headers.set(
-            'Signify-Timestamp',
+            HEADER_SIG_TIME,
             new Date().toISOString().replace('Z', '000+00:00')
         );
         headers.set('Content-Type', 'application/json');
@@ -232,19 +233,23 @@ export class SignifyClient {
     /**
      * Fetch a resource from from an external URL with headers signed by an AID
      * @async
+     * @param {string} aidName Name or alias of the AID to be used for signing
      * @param {string} url URL of the resource
      * @param {string} path Path to the resource
-     * @param {string} method HTTP method
-     * @param {any} data Data to be sent in the body of the resource
-     * @param {string} aidName Name or alias of the AID to be used for signing
+     * @param {RequestInit} req Request options should include:
+     *     - method: HTTP method
+     *     - data Data to be sent in the body of the resource.
+     *              If the data is a CESR JSON string then you should also set contentType to 'application/json+cesr'
+     *              If the data is a FormData object then you should not set the contentType and the browser will set it to 'multipart/form-data'
+     *              If the data is an object then you should use JSON.stringify to convert it to a string and set the contentType to 'application/json'
+     *     - contentType Content type of the request.
      * @returns {Promise<Response>} A promise to the result of the fetch
      */
     async signedFetch(
+        aidName: string,
         url: string,
         path: string,
-        method: string,
-        data: any,
-        aidName: string
+        req: RequestInit
     ): Promise<Response> {
         const hab = await this.identifiers().get(aidName);
         const keeper = this.manager!.get(hab);
@@ -254,42 +259,21 @@ export class SignifyClient {
             keeper.signers[0].verfer
         );
 
-        const headers = new Headers();
-        headers.set('Signify-Resource', hab.prefix);
+        const headers = new Headers(req.headers);
+        headers.set('Signify-Resource', hab['prefix']);
         headers.set(
-            'Signify-Timestamp',
+            HEADER_SIG_TIME,
             new Date().toISOString().replace('Z', '000+00:00')
         );
 
-        if (data !== null) {
-            headers.set('Content-Length', data.length);
-        } else {
-            headers.set('Content-Length', '0');
-        }
         const signed_headers = authenticator.sign(
-            headers,
-            method,
+            new Headers(headers),
+            req.method ?? 'GET',
             path.split('?')[0]
         );
-        let _body = null;
-        if (method != 'GET') {
-            if (data instanceof FormData) {
-                _body = data;
-                // do not set the content type, let the browser do it
-                // headers.set('Content-Type', 'multipart/form-data')
-            } else {
-                _body = JSON.stringify(data);
-                headers.set('Content-Type', 'application/json');
-            }
-        } else {
-            headers.set('Content-Type', 'application/json');
-        }
+        req.headers = signed_headers;
 
-        return await fetch(url + path, {
-            method: method,
-            body: _body,
-            headers: signed_headers,
-        });
+        return await fetch(url + path, req);
     }
 
     /**

src/keri/core/authing.ts

@@ -1,6 +1,12 @@
 import { Signer } from './signer';
 import { Verfer } from './verfer';
-import { desiginput, normalize, siginput } from './httping';
+import {
+    desiginput,
+    HEADER_SIG_INPUT,
+    HEADER_SIG_TIME,
+    normalize,
+    siginput,
+} from './httping';
 import { Signage, signature, designature } from '../end/ending';
 import { Cigar } from './cigar';
 import { Siger } from './siger';
@@ -9,7 +15,7 @@ export class Authenticater {
         '@method',
         '@path',
         'signify-resource',
-        'signify-timestamp',
+        HEADER_SIG_TIME.toLowerCase(),
     ];
     private _verfer: Verfer;
     private readonly _csig: Signer;
@@ -20,7 +26,7 @@ export class Authenticater {
     }
 
     verify(headers: Headers, method: string, path: string): boolean {
-        const siginput = headers.get('Signature-Input');
+        const siginput = headers.get(HEADER_SIG_INPUT);
         if (siginput == null) {
             return false;
         }

src/keri/core/httping.ts

@@ -13,6 +13,9 @@ import { Siger } from './siger';
 import { Buffer } from 'buffer';
 import { encodeBase64Url } from './base64';
 
+export const HEADER_SIG_INPUT = normalize('Signature-Input');
+export const HEADER_SIG_TIME = normalize('Signify-Timestamp');
+
 export function normalize(header: string) {
     return header.trim();
 }
@@ -107,7 +110,7 @@ export function siginput(
 
     return [
         new Map<string, string>([
-            ['Signature-Input', `${serializeDictionary(sid as Dictionary)}`],
+            [HEADER_SIG_INPUT, `${serializeDictionary(sid as Dictionary)}`],
         ]),
         sig,
     ];

test/app/clienting.test.ts

@@ -19,6 +19,9 @@ import { Groups } from '../../src/keri/app/grouping';
 import { Notifications } from '../../src/keri/app/notifying';
 
 import { Authenticater } from '../../src/keri/core/authing';
+import { Cigar } from '../../src/keri/core/cigar';
+import { HEADER_SIG_INPUT, HEADER_SIG_TIME } from '../../src/keri/core/httping';
+import { SaltyKeeper } from '../../src/keri/core/keeping';
 import { Salter, Tier } from '../../src/keri/core/salter';
 import libsodium from 'libsodium-wrappers-sumo';
 import fetchMock from 'jest-fetch-mock';
@@ -142,7 +145,7 @@ fetchMock.mockResponse((req) => {
             'EEXekkGu9IAzav6pZVJhkLnjtjM5v3AcyA-pdKUcaGei'
         );
         headers.set(
-            'Signify-Timestamp',
+            HEADER_SIG_TIME,
             new Date().toISOString().replace('Z', '000+00:00')
         );
         headers.set('Content-Type', 'application/json');
@@ -290,8 +293,8 @@ describe('SignifyClient', () => {
         // Headers in error
         let badAgentHeaders = {
             'signify-resource': 'bad_resource',
-            'signify-timestamp': '2023-08-20T15:34:31.534673+00:00',
-            'signature-input':
+            [HEADER_SIG_TIME]: '2023-08-20T15:34:31.534673+00:00',
+            [HEADER_SIG_INPUT]:
                 'signify=("signify-resource" "@method" "@path" "signify-timestamp");created=1692545671;keyid="EEXekkGu9IAzav6pZVJhkLnjtjM5v3AcyA-pdKUcaGei";alg="ed25519"',
             signature:
                 'indexed="?0";signify="0BDiSoxCv42h2BtGMHy_tpWAqyCgEoFwRa8bQy20mBB2D5Vik4gRp3XwkEHtqy6iy6SUYAytMUDtRbewotAfkCgN"',
@@ -307,7 +310,7 @@ describe('SignifyClient', () => {
         badAgentHeaders = {
             'signify-resource': 'EEXekkGu9IAzav6pZVJhkLnjtjM5v3AcyA-pdKUcaGei',
             'signify-timestamp': '2023-08-20T15:34:31.534673+00:00',
-            'signature-input':
+            [HEADER_SIG_INPUT]:
                 'signify=("signify-resource" "@method" "@path" "signify-timestamp");created=1692545671;keyid="EEXekkGu9IAzav6pZVJhkLnjtjM5v3AcyA-pdKUcaGei";alg="ed25519"',
             signature:
                 'indexed="?0";signify="0BDiSoxCv42h2BtGMHy_tpWAqyCgEoFwRa8bQy20mBB2D5Vik4gRp3XwkEHtqy6iy6SUYAytMUDtRbewotAfkCbad"',
@@ -359,12 +362,18 @@ describe('SignifyClient', () => {
             'EGFi9pCcRaLK8dPh5S7JP9Em62fBMiR1l4gW1ZazuuAO'
         );
 
+        let heads = new Headers();
+        heads.set('Content-Type', 'application/json');
+        let reqInit = {
+            headers: heads,
+            method: 'POST',
+            body: JSON.stringify({ foo: true }),
+        };
         resp = await client.signedFetch(
+            'aid1',
             'http://example.com',
             '/test',
-            'POST',
-            { foo: true },
-            'aid1'
+            reqInit
         );
         lastCall = fetchMock.mock.calls[fetchMock.mock.calls.length - 1]!;
         assert.equal(lastCall[0]!, 'http://example.com/test');
@@ -376,6 +385,47 @@ describe('SignifyClient', () => {
             lastHeaders.get('signify-resource'),
             'ELUvZ8aJEHAQE-0nsevyYTP98rBbGJUrTj5an-pCmwrK'
         );
+        assert.equal(
+            lastHeaders
+                .get(HEADER_SIG_INPUT)
+                ?.startsWith(
+                    'signify=("@method" "@path" "signify-resource" "signify-timestamp");created='
+                ),
+            true
+        );
+        assert.equal(
+            lastHeaders
+                .get(HEADER_SIG_INPUT)
+                ?.endsWith(
+                    ';keyid="BPmhSfdhCPxr3EqjxzEtF8TVy0YX7ATo0Uc8oo2cnmY9";alg="ed25519"'
+                ),
+            true
+        );
+
+        let aid = await client.identifiers().get('aid1');
+        const keeper = client.manager!.get(aid) as SaltyKeeper;
+        const signer = keeper.signers[0];
+        const created = lastHeaders
+            .get(HEADER_SIG_INPUT)
+            ?.split(';created=')[1]
+            .split(';keyid=')[0];
+        const data = `"@method": POST\n"@path": /test\n"signify-resource": ELUvZ8aJEHAQE-0nsevyYTP98rBbGJUrTj5an-pCmwrK\n"signify-timestamp": ${lastHeaders.get(
+            HEADER_SIG_TIME
+        )}\n"@signature-params: (@method @path signify-resource signify-timestamp);created=${created};keyid=BPmhSfdhCPxr3EqjxzEtF8TVy0YX7ATo0Uc8oo2cnmY9;alg=ed25519"`;
+
+        if (data) {
+            const raw = new TextEncoder().encode(data);
+            const sig = signer.sign(raw, null) as Cigar;
+            assert.equal(
+                sig.qb64,
+                lastHeaders
+                    .get('signature')
+                    ?.split('signify="')[1]
+                    .split('"')[0]
+            );
+        } else {
+            fail(`${HEADER_SIG_INPUT} is empty`);
+        }
     });
 
     test('includes HTTP status info in error message', async () => {