feat: address feedback part 2

Signed-off-by: Martin Auer <martin.auer97@gmail.com>

packages/client/lib/AccessTokenClient.ts

@@ -1,4 +1,4 @@
-import { createDPoP, CreateDPoPClientOpts } from '@sphereon/common';
+import { createDPoP, CreateDPoPClientOpts, getCreateDPoPOptions } from '@sphereon/common';
 import {
   AccessTokenRequest,
   AccessTokenRequestOpts,
@@ -93,12 +93,9 @@ export class AccessTokenClient {
 
     let dPoP: string | undefined;
     if (createDPoPOpts?.dPoPSigningAlgValuesSupported && createDPoPOpts.dPoPSigningAlgValuesSupported.length > 0) {
-      const htu = requestTokenURL.split('?')[0].split('#')[0];
-      dPoP = createDPoPOpts
-        ? await createDPoP({ ...createDPoPOpts, jwtPayloadProps: { ...createDPoPOpts.jwtPayloadProps, htu, htm: 'POST' } })
-        : undefined;
+      dPoP = createDPoPOpts ? await createDPoP(getCreateDPoPOptions(createDPoPOpts, requestTokenURL)) : undefined;
     }
-    return this.sendAuthCode(requestTokenURL, accessTokenRequest, { dPoP });
+    return this.sendAuthCode(requestTokenURL, accessTokenRequest, dPoP ? { headers: { dPoP } } : undefined);
   }
 
   public async createAccessTokenRequest(opts: Omit<AccessTokenRequestOpts, 'createDPoPOpts'>): Promise<AccessTokenRequest> {
@@ -235,10 +232,10 @@ export class AccessTokenClient {
   private async sendAuthCode(
     requestTokenURL: string,
     accessTokenRequest: AccessTokenRequest,
-    opts?: { dPoP?: string },
+    opts?: { headers?: Record<string, string> },
   ): Promise<OpenIDResponse<AccessTokenResponse>> {
     return await formPost(requestTokenURL, convertJsonToURI(accessTokenRequest, { mode: JsonURIMode.X_FORM_WWW_URLENCODED }), {
-      customHeaders: { ...(opts?.dPoP && { dpop: opts.dPoP }) },
+      customHeaders: opts?.headers ? opts.headers : undefined,
     });
   }
 

packages/client/lib/AccessTokenClientV1_0_11.ts

@@ -1,4 +1,4 @@
-import { createDPoP, CreateDPoPClientOpts } from '@sphereon/common';
+import { createDPoP, CreateDPoPClientOpts, getCreateDPoPOptions } from '@sphereon/common';
 import {
   AccessTokenRequest,
   AccessTokenRequestOpts,
@@ -97,13 +97,10 @@ export class AccessTokenClientV1_0_11 {
 
     let dPoP: string | undefined;
     if (createDPoPOpts?.dPoPSigningAlgValuesSupported && createDPoPOpts.dPoPSigningAlgValuesSupported.length > 0) {
-      const htu = requestTokenURL.split('?')[0].split('#')[0];
-      dPoP = createDPoPOpts
-        ? await createDPoP({ ...createDPoPOpts, jwtPayloadProps: { ...createDPoPOpts.jwtPayloadProps, htu, htm: 'POST' } })
-        : undefined;
+      dPoP = createDPoPOpts ? await createDPoP(getCreateDPoPOptions(createDPoPOpts, requestTokenURL)) : undefined;
     }
 
-    return this.sendAuthCode(requestTokenURL, accessTokenRequest, { dPoP });
+    return this.sendAuthCode(requestTokenURL, accessTokenRequest, dPoP ? { headers: { dPoP } } : undefined);
   }
 
   public async createAccessTokenRequest(opts: Omit<AccessTokenRequestOpts, 'createDPoPOpts'>): Promise<AccessTokenRequest> {
@@ -219,10 +216,10 @@ export class AccessTokenClientV1_0_11 {
   private async sendAuthCode(
     requestTokenURL: string,
     accessTokenRequest: AccessTokenRequest,
-    opts?: { dPoP?: string },
+    opts?: { headers?: Record<string, string> },
   ): Promise<OpenIDResponse<AccessTokenResponse>> {
     return await formPost(requestTokenURL, convertJsonToURI(accessTokenRequest, { mode: JsonURIMode.X_FORM_WWW_URLENCODED }), {
-      customHeaders: { ...(opts?.dPoP && { dpop: opts.dPoP }) },
+      customHeaders: opts?.headers ? opts.headers : undefined,
     });
   }
 

packages/client/lib/CredentialRequestClient.ts

@@ -1,4 +1,4 @@
-import { createDPoP, CreateDPoPClientOpts } from '@sphereon/common';
+import { createDPoP, CreateDPoPClientOpts, getCreateDPoPOptions } from '@sphereon/common';
 import {
   acquireDeferredCredential,
   CredentialRequestV1_0_13,
@@ -108,7 +108,7 @@ export class CredentialRequestClient {
 
   public async acquireCredentialsUsingRequest(
     uniformRequest: UniformCredentialRequest,
-    createDPoPOps?: CreateDPoPClientOpts,
+    createDPoPOpts?: CreateDPoPClientOpts,
   ): Promise<OpenIDResponse<CredentialResponse> & { access_token: string }> {
     if (this.version() < OpenId4VCIVersion.VER_1_0_13) {
       throw new Error('Versions below v1.0.13 (draft 13) are not supported by the V13 credential request client.');
@@ -124,19 +124,13 @@ export class CredentialRequestClient {
     const requestToken: string = this.credentialRequestOpts.token;
 
     let dPoP: string | undefined;
-    if (createDPoPOps) {
-      const htu = credentialEndpoint.split('?')[0].split('#')[0];
-      dPoP = createDPoPOps
-        ? await createDPoP({
-            ...createDPoPOps,
-            jwtPayloadProps: { ...createDPoPOps.jwtPayloadProps, htu, htm: 'POST', accessToken: requestToken },
-          })
-        : undefined;
+    if (createDPoPOpts) {
+      dPoP = createDPoPOpts ? await createDPoP(getCreateDPoPOptions(createDPoPOpts, credentialEndpoint, { accessToken: requestToken })) : undefined;
     }
 
     let response = (await post(credentialEndpoint, JSON.stringify(request), {
       bearerToken: requestToken,
-      customHeaders: { ...(createDPoPOps && { dpop: dPoP }) },
+      customHeaders: { ...(createDPoPOpts && { dpop: dPoP }) },
     })) as OpenIDResponse<CredentialResponse> & {
       access_token: string;
     };

packages/client/lib/CredentialRequestClientV1_0_11.ts

@@ -1,4 +1,4 @@
-import { createDPoP, CreateDPoPClientOpts } from '@sphereon/common';
+import { createDPoP, CreateDPoPClientOpts, getCreateDPoPOptions } from '@sphereon/common';
 import {
   acquireDeferredCredential,
   CredentialResponse,
@@ -65,17 +65,17 @@ export class CredentialRequestClientV1_0_11 {
     credentialTypes?: string | string[];
     context?: string[];
     format?: CredentialFormat | OID4VCICredentialFormat;
-    createDPoPOptions?: CreateDPoPClientOpts;
+    createDPoPOpts?: CreateDPoPClientOpts;
   }): Promise<OpenIDResponse<CredentialResponse> & { access_token: string }> {
     const { credentialTypes, proofInput, format, context } = opts;
 
     const request = await this.createCredentialRequest({ proofInput, credentialTypes, context, format, version: this.version() });
-    return await this.acquireCredentialsUsingRequest(request, opts.createDPoPOptions);
+    return await this.acquireCredentialsUsingRequest(request, opts.createDPoPOpts);
   }
 
   public async acquireCredentialsUsingRequest(
     uniformRequest: UniformCredentialRequest,
-    createDPoPOptions?: CreateDPoPClientOpts,
+    createDPoPOpts?: CreateDPoPClientOpts,
   ): Promise<OpenIDResponse<CredentialResponse> & { access_token: string }> {
     const request = getCredentialRequestForVersion(uniformRequest, this.version());
     const credentialEndpoint: string = this.credentialRequestOpts.credentialEndpoint;
@@ -88,19 +88,13 @@ export class CredentialRequestClientV1_0_11 {
     const requestToken: string = this.credentialRequestOpts.token;
 
     let dPoP: string | undefined;
-    if (createDPoPOptions) {
-      const htu = credentialEndpoint.split('?')[0].split('#')[0];
-      dPoP = createDPoPOptions
-        ? await createDPoP({
-            ...createDPoPOptions,
-            jwtPayloadProps: { ...createDPoPOptions.jwtPayloadProps, htu, htm: 'POST', accessToken: requestToken },
-          })
-        : undefined;
+    if (createDPoPOpts) {
+      dPoP = createDPoPOpts ? await createDPoP(getCreateDPoPOptions(createDPoPOpts, credentialEndpoint, { accessToken: requestToken })) : undefined;
     }
 
     let response = (await post(credentialEndpoint, JSON.stringify(request), {
       bearerToken: requestToken,
-      customHeaders: { ...(createDPoPOptions && { dpop: dPoP }) },
+      customHeaders: { ...(createDPoPOpts && { dpop: dPoP }) },
     })) as OpenIDResponse<CredentialResponse> & {
       access_token: string;
     };

packages/common/lib/dpop/DPoP.ts

@@ -66,6 +66,23 @@ export interface CreateDPoPOpts<JwtPayloadProps = CreateDPoPJwtPayloadProps> {
 
 export type CreateDPoPClientOpts = CreateDPoPOpts<Omit<CreateDPoPJwtPayloadProps, 'htm' | 'htu'>>;
 
+export function getCreateDPoPOptions(
+  createDPoPClientOpts: CreateDPoPClientOpts,
+  endPointUrl: string,
+  resourceRequestOpts?: { accessToken: string },
+): CreateDPoPOpts {
+  const htu = endPointUrl.split('?')[0].split('#')[0];
+  return {
+    ...createDPoPClientOpts,
+    jwtPayloadProps: {
+      ...createDPoPClientOpts.jwtPayloadProps,
+      htu,
+      htm: 'POST',
+      ...(resourceRequestOpts && { accessToken: resourceRequestOpts.accessToken }),
+    },
+  };
+}
+
 export async function createDPoP(options: CreateDPoPOpts): Promise<string> {
   const { createJwtCallback, jwtIssuer, jwtPayloadProps, dPoPSigningAlgValuesSupported } = options;
 

packages/issuer-rest/lib/IssuerTokenEndpoint.ts

@@ -15,15 +15,20 @@ import { NextFunction, Request, Response } from 'express'
  */
 export const handleTokenRequest = <T extends object>({
   tokenExpiresIn, // expiration in seconds
+  accessTokenEndpoint,
   accessTokenSignerCallback,
   accessTokenIssuer,
   cNonceExpiresIn, // expiration in seconds
   issuer,
   interval,
   dPoPVerifyJwtCallback,
+  requireDPoP,
 }: Required<Pick<ITokenEndpointOpts, 'accessTokenIssuer' | 'cNonceExpiresIn' | 'interval' | 'accessTokenSignerCallback' | 'tokenExpiresIn'>> & {
   issuer: VcIssuer<T>
   dPoPVerifyJwtCallback?: DPoPVerifyJwtCallback
+  requireDPoP?: boolean
+  // The full URL of the access token endpoint
+  accessTokenEndpoint?: string
 }) => {
   return async (request: Request, response: Response) => {
     response.set({
@@ -47,6 +52,13 @@ export const handleTokenRequest = <T extends object>({
     }
 
     let dPoPJwk: JWK | undefined
+    if (requireDPoP && !request.headers.dpop) {
+      return sendErrorResponse(response, 400, {
+        error: TokenErrorResponse.invalid_request,
+        error_description: 'DPoP is required for requesting access tokens',
+      })
+    }
+
     if (request.headers.dpop) {
       if (!dPoPVerifyJwtCallback) {
         return sendErrorResponse(response, 400, {
@@ -56,7 +68,7 @@ export const handleTokenRequest = <T extends object>({
       }
 
       try {
-        const fullUrl = request.protocol + '://' + request.get('host') + request.originalUrl
+        const fullUrl = accessTokenEndpoint ?? request.protocol + '://' + request.get('host') + request.originalUrl
         dPoPJwk = await verifyDPoP(
           { method: request.method, headers: request.headers, fullUrl },
           {