Fix bug w/ threshold verification options (#616)

Signed-off-by: Brian DeHamer <bdehamer@github.com>

Author: bdehamer

.changeset/dull-cougars-prove.md

@@ -0,0 +1,5 @@
+---
+'sigstore': patch
+---
+
+Fix bug when setting `tlogThreshold`/`ctLogThreshold` verification options to 0

packages/client/src/__tests__/config.test.ts

@@ -107,17 +107,17 @@ describe('artifactVerificationOptions', () => {
         '1.2.3.4': 'value1',
         '5.6.7.8': 'value2',
       },
-      ctLogThreshold: 2,
-      tlogThreshold: 3,
+      ctLogThreshold: 0,
+      tlogThreshold: 0,
     };
 
     it('returns the expected options', () => {
       const result = artifactVerificationOptions(options);
-      expect(result.ctlogOptions.disable).toBe(false);
-      expect(result.ctlogOptions.threshold).toBe(2);
+      expect(result.ctlogOptions.disable).toBe(true);
+      expect(result.ctlogOptions.threshold).toBe(0);
       expect(result.ctlogOptions.detachedSct).toBe(false);
-      expect(result.tlogOptions.disable).toBe(false);
-      expect(result.tlogOptions.threshold).toBe(3);
+      expect(result.tlogOptions.disable).toBe(true);
+      expect(result.tlogOptions.threshold).toBe(0);
       expect(result.tlogOptions.performOnlineVerification).toBe(false);
       expect(result.signers).toBeDefined();
 

packages/client/src/config.ts

@@ -157,13 +157,13 @@ export function artifactVerificationOptions(
   // Construct the artifact verification options w/ defaults
   return {
     ctlogOptions: {
-      disable: false,
-      threshold: options.ctLogThreshold || 1,
+      disable: options.ctLogThreshold === 0,
+      threshold: options.ctLogThreshold ?? 1,
       detachedSct: false,
     },
     tlogOptions: {
-      disable: false,
-      threshold: options.tlogThreshold || 1,
+      disable: options.tlogThreshold === 0,
+      threshold: options.tlogThreshold ?? 1,
       performOnlineVerification: false,
     },
     signers,