Backport of fixes #17732 - AccessorID in request body should be optional when updating ACL token into release/1.16.x (#17833)

* backport of commit 31d96f5fb22d86b62b5e47a44bc07cdf6eab200b

* backport of commit 78dbcfbeeec535dfc284dfa3c5a13b46893c0a50

* backport of commit de3dceed994efefbfd61f0fb136b3cf8265bc3fd

* backport of commit 2c436e6f59a1f0f7740fa8fa208a992f26898b8b

---------

Co-authored-by: gbolo <george.bolo@gmail.com>

.changelog/17739.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+http: fixed API endpoint `PUT /acl/token/:AccessorID` (update token), no longer requires `AccessorID` in the request body. Web UI can now update tokens.
+ ```

agent/acl_endpoint.go

@@ -441,9 +441,17 @@ func (s *HTTPHandlers) aclTokenSetInternal(req *http.Request, tokenAccessorID st
 		return nil, HTTPError{StatusCode: http.StatusBadRequest, Reason: fmt.Sprintf("Token decoding failed: %v", err)}
 	}
 
-	if !create && args.ACLToken.AccessorID != tokenAccessorID {
+	if !create {
+		// NOTE: AccessorID in the request body is optional when not creating a new token.
+		// If not present in the body and only in the URL then it will be filled in by Consul.
+		if args.ACLToken.AccessorID == "" {
+			args.ACLToken.AccessorID = tokenAccessorID
+		}
+
+		if args.ACLToken.AccessorID != tokenAccessorID {
 			return nil, HTTPError{StatusCode: http.StatusBadRequest, Reason: "Token Accessor ID in URL and payload do not match"}
 		}
+	}
 
 	var out structs.ACLToken
 	if err := s.agent.RPC(req.Context(), "ACL.TokenSet", args, &out); err != nil {

agent/acl_endpoint_test.go

@@ -907,6 +907,48 @@ func TestACL_HTTP(t *testing.T) {
 			tokenMap[token.AccessorID] = token
 		})
 
+		t.Run("Update without AccessorID in request body", func(t *testing.T) {
+			originalToken := tokenMap[idMap["token-cloned"]]
+
+			// Secret will be filled in
+			tokenInput := &structs.ACLToken{
+				Description: "Even Better description for this cloned token",
+				Policies: []structs.ACLTokenPolicyLink{
+					{
+						ID:   idMap["policy-read-all-nodes"],
+						Name: policyMap[idMap["policy-read-all-nodes"]].Name,
+					},
+				},
+				NodeIdentities: []*structs.ACLNodeIdentity{
+					{
+						NodeName:   "foo",
+						Datacenter: "bar",
+					},
+				},
+			}
+
+			req, _ := http.NewRequest("PUT", "/v1/acl/token/"+originalToken.AccessorID, jsonBody(tokenInput))
+			req.Header.Add("X-Consul-Token", "root")
+			resp := httptest.NewRecorder()
+			obj, err := a.srv.ACLTokenCRUD(resp, req)
+			require.NoError(t, err)
+			token, ok := obj.(*structs.ACLToken)
+			require.True(t, ok)
+
+			require.Equal(t, originalToken.AccessorID, token.AccessorID)
+			require.Equal(t, originalToken.SecretID, token.SecretID)
+			require.Equal(t, tokenInput.Description, token.Description)
+			require.Equal(t, tokenInput.Policies, token.Policies)
+			require.Equal(t, tokenInput.NodeIdentities, token.NodeIdentities)
+			require.True(t, token.CreateIndex > 0)
+			require.True(t, token.CreateIndex < token.ModifyIndex)
+			require.NotNil(t, token.Hash)
+			require.NotEqual(t, token.Hash, []byte{})
+			require.NotEqual(t, token.Hash, originalToken.Hash)
+
+			tokenMap[token.AccessorID] = token
+		})
+
 		t.Run("CRUD Missing Token Accessor ID", func(t *testing.T) {
 			req, _ := http.NewRequest("GET", "/v1/acl/token/", nil)
 			req.Header.Add("X-Consul-Token", "root")