Support Steam OTP (#505)

passKitTests/Models/PasswordTest.swift

@@ -317,4 +317,14 @@ class PasswordTest: XCTestCase {
         XCTAssertNotNil(otpStrings)
         XCTAssertEqual(otpStrings!.description, "HmacBased".localize())
     }
+
+    func testSteamOtpStringsToken() {
+        let password = getPasswordObjectWith(content: STEAM_TOTP_URL)
+        let otpStrings = password.getOtpStrings()
+        let otpDescription = otpStrings!.description
+
+        XCTAssertNotNil(otpStrings)
+        XCTAssert(otpDescription.hasPrefix("TimeBased".localize() + " ("))
+        XCTAssert(otpDescription.hasSuffix(")"))
+    }
 }

passKitTests/Parser/TokenBuilderTest.swift

@@ -171,6 +171,27 @@ class TokenBuilderTest: XCTestCase {
         }
     }
 
+    func testRepresentation() {
+        [
+            (nil, .numeric),
+            ("steamguard", .steamguard),
+            ("numeric", .numeric),
+            ("wrong representation", .numeric),
+        ].forEach { (inputRepresentation: String?, represenetation: OneTimePassword.Generator.Representation) in
+            var builder = TokenBuilder()
+                .usingSecret(SECRET)
+                .usingType("totp")
+                .usingRepresentation(inputRepresentation)
+            if represenetation == .steamguard {
+                builder = builder
+                    .usingDigits("5")
+                    .usingAlgorithm("sha1")
+            }
+            let token = builder.build()
+            XCTAssertEqual(token?.generator.representation, represenetation)
+        }
+    }
+
     func testUnparsableCounter() {
         let token = TokenBuilder()
             .usingSecret(SECRET)

passKitTests/Testbase/TestBase.swift

@@ -14,6 +14,7 @@ let PASSWORD_PATH = "/path/to/password"
 let PASSWORD_URL = URL(fileURLWithPath: "/path/to/password")
 let PASSWORD_STRING = "abcd1234"
 let TOTP_URL = "otpauth://totp/email@email.com?secret=abcd1234"
+let STEAM_TOTP_URL = "otpauth://totp/username?secret=12345678901234567890&issuer=Steam&algorithm=SHA1&digits=5&period=30&representation=steamguard"
 let HOTP_URL = "otpauth://hotp/email@email.com?secret=abcd1234"
 
 let FIELD = "key" => "value"