2 files changed, 36 insertions, 12 deletions
diff --git a/packages/backend/src/server/api/endpoints/notes/create.test.ts b/packages/backend/src/server/api/endpoints/notes/create.test.ts
index 6086f99c92..3228bbd014 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.test.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.test.ts
@@ -34,11 +34,10 @@ describe('api:notes/create', () => {
 					.toBe(VALID);
 			});
 
-			// TODO
-			//test('null post', () => {
-			//	expect(v({ text: null }))
-			//		.toBe(INVALID);
-			//});
+			test('null post', () => {
+				expect(v({ text: null }))
+					.toBe(INVALID);
+			});
 
 			test('0 characters post', () => {
 				expect(v({ text: '' }))
@@ -49,6 +48,11 @@ describe('api:notes/create', () => {
 				expect(v({ text: await tooLong }))
 					.toBe(INVALID);
 			});
+
+			test('whitespace-only post', () => {
+				expect(v({ text: ' ' }))
+					.toBe(INVALID);
+			});
 		});
 
 		describe('cw', () => {
diff --git a/packages/backend/src/server/api/endpoints/notes/create.ts b/packages/backend/src/server/api/endpoints/notes/create.ts
index c5d42dabe4..29a0f7418c 100644
--- a/packages/backend/src/server/api/endpoints/notes/create.ts
+++ b/packages/backend/src/server/api/endpoints/notes/create.ts
@@ -172,13 +172,33 @@ export const paramDef = {
 		},
 	},
 	// (re)note with text, files and poll are optional
-	anyOf: [
-		{ required: ['text'] },
-		{ required: ['renoteId'] },
-		{ required: ['fileIds'] },
-		{ required: ['mediaIds'] },
-		{ required: ['poll'] },
-	],
+	if: {
+		properties: {
+			renoteId: {
+				type: 'null',
+			},
+			fileIds: {
+				type: 'null',
+			},
+			mediaIds: {
+				type: 'null',
+			},
+			poll: {
+				type: 'null',
+			},
+		},
+	},
+	then: {
+		properties: {
+			text: {
+				type: 'string',
+				minLength: 1,
+				maxLength: MAX_NOTE_TEXT_LENGTH,
+				pattern: '[^\\s]+',
+			},
+		},
+		required: ['text'],
+	},
 } as const;
 
 @Injectable()