Add placeholder parameter for Prompt dialog

packages/rpc-methods/jest.config.js

@@ -6,10 +6,10 @@ module.exports = deepmerge(baseConfig, {
   coveragePathIgnorePatterns: ['./src/index.ts'],
   coverageThreshold: {
     global: {
-      branches: 86.84,
+      branches: 87.09,
       functions: 87.27,
-      lines: 83.18,
-      statements: 83.18,
+      lines: 83.27,
+      statements: 83.27,
     },
   },
   testTimeout: 2500,

packages/rpc-methods/src/restricted/dialog.test.ts

@@ -108,6 +108,7 @@ describe('implementation', () => {
           fields: {
             title: 'Foo',
             description: 'Bar',
+            placeholder: 'Baz',
           },
         },
       });
@@ -116,6 +117,7 @@ describe('implementation', () => {
       expect(hooks.showDialog).toHaveBeenCalledWith('foo', DialogType.Prompt, {
         title: 'Foo',
         description: 'Bar',
+        placeholder: 'Baz',
       });
     });
   });
@@ -307,6 +309,31 @@ describe('implementation', () => {
       },
     );
 
+    it.each([true, 2, [], {}, new (class {})()])(
+      'rejects invalid placeholder contents',
+      async (value) => {
+        const hooks = getMockDialogHooks();
+        const implementation = getDialogImplementation(hooks);
+
+        await expect(
+          implementation({
+            context: { origin: 'foo' },
+            method: 'snap_dialog',
+            params: {
+              type: DialogType.Prompt,
+              fields: {
+                title: 'Foo',
+                description: 'Bar',
+                placeholder: value,
+              } as any,
+            },
+          }),
+        ).rejects.toThrow(
+          /Invalid params: At path: fields\.placeholder -- Expected a string, but received: .*\./u,
+        );
+      },
+    );
+
     it('rejects too long text area contents', async () => {
       const hooks = getMockDialogHooks();
       const implementation = getDialogImplementation(hooks);
@@ -349,5 +376,30 @@ describe('implementation', () => {
         'Invalid params: Prompts may not specify a "textAreaContent" field.',
       );
     });
+
+    it.each([DialogType.Alert, DialogType.Confirmation])(
+      'rejects placeholder field for alerts and confirmations',
+      async (type) => {
+        const hooks = getMockDialogHooks();
+        const implementation = getDialogImplementation(hooks);
+        await expect(
+          implementation({
+            context: { origin: 'foo' },
+            method: 'snap_dialog',
+            params: {
+              type,
+              fields: {
+                title: 'Foo',
+                description: 'Bar',
+                textAreaContent: 'Baz',
+                placeholder: 'Foobar',
+              } as any,
+            },
+          }),
+        ).rejects.toThrow(
+          'Invalid params: Alerts or confirmations may not specify a "placeholder" field.',
+        );
+      },
+    );
   });
 });

packages/rpc-methods/src/restricted/dialog.ts

@@ -34,18 +34,23 @@ const BaseFieldsStruct = object({
   title: size(string(), 1, 40),
   description: optional(size(string(), 1, 140)),
   textAreaContent: optional(size(string(), 1, 1800)),
+  placeholder: optional(size(string(), 1, 40)),
 });
 
 const PromptFieldsStruct = omit(BaseFieldsStruct, ['textAreaContent']);
 
+const AlertFieldsStruct = omit(BaseFieldsStruct, ['placeholder']);
+
+const ConfirmationFieldsStruct = omit(BaseFieldsStruct, ['placeholder']);
+
 /**
  * @property title - The alert title, no greater than 40 characters long.
  * @property description - A description, displayed with the title, no greater
  * than 140 characters long.
  * @property textAreaContent - Free-from text content, no greater than 1800
  * characters long.
  */
-export type AlertFields = Infer<typeof BaseFieldsStruct>;
+export type AlertFields = Infer<typeof AlertFieldsStruct>;
 
 /**
  * @property title - A question describing what the user is confirming, no
@@ -55,7 +60,7 @@ export type AlertFields = Infer<typeof BaseFieldsStruct>;
  * @property textAreaContent - Free-from text content, no greater than 1800
  * characters long.
  */
-export type ConfirmationFields = Infer<typeof BaseFieldsStruct>;
+export type ConfirmationFields = Infer<typeof ConfirmationFieldsStruct>;
 
 /**
  * @property title - The prompt title, no greater than 40 characters long.
@@ -139,12 +144,12 @@ const BaseParamsStruct = type({
 
 const AlertParametersStruct = object({
   type: literal(DialogType.Alert),
-  fields: BaseFieldsStruct,
+  fields: AlertFieldsStruct,
 });
 
 const ConfirmationParametersStruct = object({
   type: literal(DialogType.Confirmation),
-  fields: BaseFieldsStruct,
+  fields: ConfirmationFieldsStruct,
 });
 
 const PromptParametersStruct = object({
@@ -235,6 +240,13 @@ function getValidatedParams(
         });
       }
 
+      if (key === 'placeholder' && errorType === 'never') {
+        throw ethErrors.rpc.invalidParams({
+          message:
+            'Invalid params: Alerts or confirmations may not specify a "placeholder" field.',
+        });
+      }
+
       throw ethErrors.rpc.invalidParams({
         message: `Invalid params: ${error.message}.`,
       });