server: Support P2WPKH address format (#33)

server/app/com/xsn/explorer/models/Address.scala

@@ -11,7 +11,7 @@ class Address private (val string: String) extends AnyVal with WrappedString
 
 object Address {
 
-  private val pattern = "^[a-zA-Z0-9]{34}$".r.pattern
+  private val pattern = "(^[a-zA-Z0-9]{34}$)|(^[a-zA-Z0-9]{42}$)".r.pattern
 
   def from(string: String): Option[Address] = {
     if (pattern.matcher(string).matches()) {

server/test/com/xsn/explorer/models/AddressSpec.scala

@@ -0,0 +1,62 @@
+package com.xsn.explorer.models
+
+import org.scalatest.{MustMatchers, OptionValues, WordSpec}
+
+class AddressSpec extends WordSpec with MustMatchers with OptionValues {
+
+  "from" should {
+    "allow to create a legacy address" in {
+      val input = "Xvjue2ZLnJwTrSLUBx7DTHaSHTdpWrxtLF"
+      val result = Address.from(input)
+      result.value.string mustEqual input
+    }
+
+    "allow to create a P2WPKH address" in {
+      val input = "bc1qzhayf65p2j4h3pfw22aujgr5w42xfqzx5uvddt"
+      val result = Address.from(input)
+      result.value.string mustEqual input
+    }
+
+    "reject an empty string" in {
+      val input = ""
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject whitespaces" in {
+      val input = " Xvjue2ZLnJwTrSLUBx7DTHaSHTdpWrxtLF "
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject invalid characters" in {
+      val input = "bc1qzhayf65p2j4h3pfw22aujgr5w42xfqzx.uvddt"
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject invalid address, 1 character missing" in {
+      val input = "Xvjue2ZLnJwTrSLUBx7DTHaSHTdpWrxtL"
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject invalid address, 1 extra character" in {
+      val input = "Xvjue2ZLnJwTrSLUBx7DTHaSHTdpWrxtLFf"
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject invalid address, 1 character missing on P2WPKH" in {
+      val input = "bc1qzhayf65p2j4h3pfw22aujgr5w42xfqzx5uvdd"
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+
+    "reject invalid address, 1 extra character on P2WPKH" in {
+      val input = "bc1qzhayf65p2j4h3pfw22aujgr5w42xfqzx5uvddt1"
+      val result = Address.from(input)
+      result mustEqual Option.empty
+    }
+  }
+}