feat(validation): adds domain validation to client

Sources/ImgixSwift/ImgixClient.swift

@@ -5,6 +5,9 @@
 
 import Foundation
 
+// regex pattern used to determine if a domain is valid
+let _domainRegex = #"^(?:[a-z\d\-_]{1,62}\.){0,125}(?:[a-z\d](?:\-(?=\-*[a-z\d])|[a-z]|\d){0,62}\.)[a-z\d]{1,63}$"#;
+
 @objc open class ImgixClient: NSObject {
  @objc static public let VERSION = "1.1.3"
 
@@ -13,22 +16,30 @@ import Foundation
  @objc open var secureUrlToken: String?
  @objc open var includeLibraryParam: Bool = true
 
+ enum ClientError: Error {
+ case invalidDomain(host: String, _ reason: String)
+ }
+
  @objc public init(host: String) {
+ let _ = try! ImgixClient.validateDomain(host)
  self.host = host
  }
 
  @objc public init(host: String, useHttps: Bool) {
+ let _ = try! ImgixClient.validateDomain(host)
  self.host = host
  self.useHttps = useHttps
  }
 
  @objc public init(host: String, useHttps: Bool, secureUrlToken: String) {
+ let _ = try! ImgixClient.validateDomain(host)
  self.host = host
  self.useHttps = useHttps
  self.secureUrlToken = secureUrlToken
  }
 
  @objc public init(host: String, secureUrlToken: String) {
+ let _ = try! ImgixClient.validateDomain(host)
  self.host = host
  self.secureUrlToken = secureUrlToken
  }
@@ -156,4 +167,19 @@ import Foundation
 
  return URLQueryItem.init(name: "s", value: signature)
  }
+
+ class public func validateDomain(_ host: String) throws -> String {
+ let regex = try! NSRegularExpression(pattern: _domainRegex)
+ let range = NSRange(location: 0, length: host.count)
+ let match = regex.firstMatch(in: host, options: [], range: range) != nil
+ if !match{
+ throw ClientError.invalidDomain(host:host, """
+ Domain must be passed in as fully-qualified \
+ domain name and should not include a protocol or any path \
+ element, i.e. 'example.imgix.net'.
+ """)
+ }
+ return host
+ }
 }
+

Tests/ImgixSwiftTests/BuildUrlTests.swift

@@ -145,4 +145,9 @@ class BuildUrlTests: XCTestCase {
  print(generatedUrl)
  XCTAssert(generatedUrl.absoluteString == expectedUrl)
  }
+
+ func testValidatesDomain() {
+ let malformedHost = "http://www.imgix.com"
+ XCTAssertThrowsError(try ImgixClient.validateDomain(malformedHost))
+ }
 }