From 3fe279da682fc9091377c8f374ac924faf24cc5e Mon Sep 17 00:00:00 2001
From: Marcis Bergmanis <marcisbergmanis@gmail.com>
Date: Tue, 5 Oct 2021 10:09:20 +0300
Subject: [PATCH] Adds `all-of` schema rule

---
 src/validate/all-of.js | 45 ++++++++++++++++++++++++++++
 src/validate/schema.js | 12 ++++++++
 tests/all-of.test.js   | 67 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 src/validate/all-of.js
 create mode 100644 tests/all-of.test.js

diff --git a/src/validate/all-of.js b/src/validate/all-of.js
new file mode 100644
index 0000000..734f120
--- /dev/null
+++ b/src/validate/all-of.js
@@ -0,0 +1,45 @@
+/**
+ * @this {import('src').Context}
+ * @param {*} value
+ * @param {*[]} currentSchema
+ * @param {(string | number)[]} position
+ */
+function validateAllOf(value, currentSchema, position) {
+	let errorDepth = position.length + 1;
+	let possibleError;
+
+	const passSize = currentSchema.length;
+	let passedValues = 0;
+
+	for (const key in currentSchema) {
+		try {
+			// Run shallow validation
+			this.validateSchema.call(
+				{...this, shallow: true},
+				value,
+				position,
+				currentSchema[key],
+			);
+
+			passedValues += 1;
+		} catch (e) {
+			if (e.position && e.position.length > errorDepth) {
+				possibleError = key;
+				errorDepth = e.position.length;
+			}
+		}
+	}
+
+	if (passedValues >= passSize) {
+		return;
+	}
+
+	// Guessing the error based on error depth
+	if (possibleError) {
+		return possibleError;
+	}
+
+	this.error("Value doesn't match all of criteria", "allOf", position);
+}
+
+module.exports = validateAllOf;
diff --git a/src/validate/schema.js b/src/validate/schema.js
index be8f96e..ccd70ad 100644
--- a/src/validate/schema.js
+++ b/src/validate/schema.js
@@ -1,6 +1,7 @@
 const GenericError = require("../diagnostics/generic-error");
 
 const validateEnum = require("./enum");
+const validateAllOf = require("./all-of");
 const validateAnyOf = require("./any-of");
 const validateString = require("./type/string");
 const validateObject = require("./type/object");
@@ -67,6 +68,17 @@ function validateSchema(json, position, currentSchema = this.schema) {
 		return;
 	}
 
+	if (!this.shallow && currentSchema.allOf) {
+		const key = validateAllOf.call(this, json, currentSchema.allOf, position);
+
+		if (typeof key === "undefined") {
+			return;
+		}
+
+		validateSchema.call(this, json, position, currentSchema.allOf[key]);
+		return;
+	}
+
 	if (!this.shallow && currentSchema.anyOf) {
 		const key = validateAnyOf.call(this, json, currentSchema.anyOf, position);
 
diff --git a/tests/all-of.test.js b/tests/all-of.test.js
new file mode 100644
index 0000000..19118f9
--- /dev/null
+++ b/tests/all-of.test.js
@@ -0,0 +1,67 @@
+const {test} = require("uvu");
+const assert = require("uvu/assert");
+
+const ValidationError = require("../src/diagnostics/validation-error");
+const output = require("../src/output");
+
+const userConfig = {};
+
+test("allOf with one empty schema", () => {
+	const schema = {
+		"allOf": [{}],
+	};
+	const errors = output("1", schema, userConfig);
+
+	assert.equal(errors, []);
+});
+
+test("allOf with two empty schemas", () => {
+	const schema = {
+		"allOf": [{}, {}],
+	};
+	const errors = output("1", schema, userConfig);
+
+	assert.equal(errors, []);
+});
+
+test("allOf with two schemas, the first is empty - number is valid", () => {
+	const schema = {
+		"allOf": [{}, { "type": "number" }],
+	};
+	const errors = output("1", schema, userConfig);
+
+	assert.equal(errors, []);
+});
+
+test("allOf with two schemas, the first is empty - string is invalid", () => {
+	const schema = {
+		"allOf": [{}, { "type": "number" }],
+	};
+	const errors = output("\"foo\"", schema, userConfig);
+
+	assert.equal(errors, [
+		new ValidationError("Value doesn't match all of criteria", "allOf", [])
+	]);
+});
+
+test("allOf with two schemas, the second is empty - number is valid", () => {
+	const schema = {
+		"allOf": [{ "type": "number" }, {}],
+	};
+	const errors = output("1", schema, userConfig);
+
+	assert.equal(errors, []);
+});
+
+test("allOf with two schemas, the second is empty - string is invalid", () => {
+	const schema = {
+		"allOf": [{ "type": "number" }, {}],
+	};
+	const errors = output("\"foo\"", schema, userConfig);
+
+	assert.equal(errors, [
+		new ValidationError("Value doesn't match all of criteria", "allOf", [])
+	]);
+});
+
+test.run();