From 9b8f126d36b16b1ddcf168d2be35ed32545be5e7 Mon Sep 17 00:00:00 2001
From: Daniel Saidi <daniel.saidi@gmail.com>
Date: Thu, 11 Jun 2020 15:52:55 +0200
Subject: [PATCH] Add e-mail validator

---
 .../SwiftKit/Validation/EmailValidator.swift  | 20 ++++++++
 Sources/SwiftKit/Validation/Validator.swift   | 16 ++++++
 .../Operations/PerformAsyncTests.swift        | 19 -------
 .../Validation/EmailValidatorTests.swift      | 51 +++++++++++++++++++
 4 files changed, 87 insertions(+), 19 deletions(-)
 create mode 100644 Sources/SwiftKit/Validation/EmailValidator.swift
 create mode 100644 Sources/SwiftKit/Validation/Validator.swift
 delete mode 100644 Tests/SwiftKitTests/Operations/PerformAsyncTests.swift
 create mode 100644 Tests/SwiftKitTests/Validation/EmailValidatorTests.swift

diff --git a/Sources/SwiftKit/Validation/EmailValidator.swift b/Sources/SwiftKit/Validation/EmailValidator.swift
new file mode 100644
index 0000000..4de5fce
--- /dev/null
+++ b/Sources/SwiftKit/Validation/EmailValidator.swift
@@ -0,0 +1,20 @@
+//
+//  EmailValidator.swift
+//  SwiftKit
+//
+//  Created by Daniel Saidi on 2020-06-09.
+//  Copyright © 2020 Daniel Saidi. All rights reserved.
+//
+
+import Foundation
+
+public class EmailValidator: Validator {
+    
+    public init() {}
+    
+    public func validate(_ string: String) -> Bool {
+        let regExp = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,} ?"
+        let predicate = NSPredicate(format: "SELF MATCHES %@", regExp)
+        return predicate.evaluate(with: string)
+    }
+}
diff --git a/Sources/SwiftKit/Validation/Validator.swift b/Sources/SwiftKit/Validation/Validator.swift
new file mode 100644
index 0000000..02e2632
--- /dev/null
+++ b/Sources/SwiftKit/Validation/Validator.swift
@@ -0,0 +1,16 @@
+//
+//  Validator.swift
+//  SwiftKit
+//
+//  Created by Daniel Saidi on 2020-06-09.
+//  Copyright © 2020 Daniel Saidi. All rights reserved.
+//
+
+import Foundation
+
+public protocol Validator {
+    
+    associatedtype Validation
+    
+    func validate(_ obj: Validation) -> Bool
+}
diff --git a/Tests/SwiftKitTests/Operations/PerformAsyncTests.swift b/Tests/SwiftKitTests/Operations/PerformAsyncTests.swift
deleted file mode 100644
index 75277ee..0000000
--- a/Tests/SwiftKitTests/Operations/PerformAsyncTests.swift
+++ /dev/null
@@ -1,19 +0,0 @@
-//
-//  PerformAsyncTests.swift
-//  SwiftKitTests
-//
-//  Created by Daniel Saidi on 2020-06-01.
-//  Copyright © 2020 Daniel Saidi. All rights reserved.
-//
-
-import Quick
-import Nimble
-import SwiftKit
-
-class PerformTests: QuickSpec {
-    
-    override func spec() {
-        
-        
-    }
-}
diff --git a/Tests/SwiftKitTests/Validation/EmailValidatorTests.swift b/Tests/SwiftKitTests/Validation/EmailValidatorTests.swift
new file mode 100644
index 0000000..89a826d
--- /dev/null
+++ b/Tests/SwiftKitTests/Validation/EmailValidatorTests.swift
@@ -0,0 +1,51 @@
+//
+//  PerformAsyncTests.swift
+//  SwiftKitTests
+//
+//  Created by Daniel Saidi on 2020-06-09.
+//  Copyright © 2020 Daniel Saidi. All rights reserved.
+//
+
+import Quick
+import Nimble
+import SwiftKit
+
+class EmailValidatorTests: QuickSpec {
+    
+    override func spec() {
+        
+        describe("email validator") {
+            
+            let validate = EmailValidator().validate
+            
+            context("when validating validating valid addresses") {
+                
+                it("validates valid email addresses") {
+                    expect(validate("foobar@baz.com")).to(beTrue())
+                    expect(validate("foo1.bar2@baz.com")).to(beTrue())
+                    expect(validate("foo.bar@gmail.com")).to(beTrue())
+                }
+                
+                it("validates long top domains") {
+                    expect(validate("foobar@baz.co")).to(beTrue())
+                    expect(validate("foobar@baz.com")).to(beTrue())
+                    expect(validate("foo1.bar2@baz.comm")).to(beTrue())
+                    expect(validate("foo.bar@gmail.commmmmmmmmmmmmmmm")).to(beTrue())
+                }
+            }
+            
+            context("when validating invalid addresses") {
+                
+                it("does not validate invalid email addresses") {
+                    expect(validate("foobar")).to(beFalse())
+                    expect(validate("foo1.bar2@")).to(beFalse())
+                    expect(validate("foo.bar@gmail")).to(beFalse())
+                }
+                
+                it("does not validate too short top domains") {
+                    expect(validate("foobar@baz.c")).to(beFalse())
+                }
+            }
+        }
+    }
+}