Social login: Add SocialLoginButtonFactory that builds SocialLoginButton and apply dedicated theme if needed.

Riot/Modules/Authentication/SocialLogin/SocialLoginButtonFactory.swift

@@ -0,0 +1,236 @@
+// 
+// Copyright 2020 New Vector Ltd
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+import Foundation
+
+@objc
+enum SocialLoginButtonMode: Int {
+    case `continue`
+    case signIn
+    case signUp
+}
+
+/// `SocialLoginButtonFactory` builds SocialLoginButton and apply dedicated theme if needed.
+class SocialLoginButtonFactory {
+    
+    // MARK - Public
+            
+    func build(with identityProvider: MXLoginSSOIdentityProvider, mode: SocialLoginButtonMode) -> SocialLoginButton {
+        let button = SocialLoginButton()
+        
+        let defaultStyle: SocialLoginButtonStyle
+        var styles: [String: SocialLoginButtonStyle] = [:]
+        
+        switch identityProvider.identifier {
+        case "google":
+            (defaultStyle, styles) = self.buildGoogleButtonStyles()
+        case "facebook":
+            (defaultStyle, styles) = self.buildFacebookButtonStyles()
+        case "github":
+            (defaultStyle, styles) = self.buildGitHubButtonStyles()
+        case "apple":
+            (defaultStyle, styles) = self.buildAppleButtonStyles()
+        case "twitter":
+            (defaultStyle, styles) = self.buildTwitterButtonStyles()
+        default:
+            let image: SourceImage?
+            
+            if let imageStringURL = identityProvider.icon, let imageURL = URL(string: imageStringURL) {
+                image = .remote(imageURL)
+            } else {
+                image = nil
+            }
+            
+            (defaultStyle, styles) = self.buildDefaultButtonStyles(with: image)
+        }
+        
+        let title = self.buildButtonTitle(with: identityProvider.name, mode: mode)
+        
+        let viewData = SocialLoginButtonViewData(identifier: identityProvider.identifier,
+                                                 title: title,
+                                                 defaultStyle: defaultStyle,
+                                                 themeStyles: styles)
+        
+        button.fill(with: viewData)
+        
+        return button
+    }
+    
+    // MARK - Private
+    
+    private func buildButtonTitle(with providerTitle: String, mode: SocialLoginButtonMode) -> String {
+        let buttonTitle: String
+        
+        switch mode {
+        case .signIn:
+            buttonTitle = VectorL10n.socialLoginButtonTitleSignIn(providerTitle)
+        case .signUp:
+            buttonTitle = VectorL10n.socialLoginButtonTitleSignUp(providerTitle)
+        case .continue:
+            buttonTitle = VectorL10n.socialLoginButtonTitleContinue(providerTitle)
+        }
+        
+        return buttonTitle
+    }
+    
+    private func buildAppleButtonStyles() -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        var lightImage: SourceImage?
+        
+        let appleLogo = Asset.Images.socialLoginButtonApple.image
+        
+        if let appleLogoLightStyle = appleLogo.vc_tintedImage(usingColor: .white) {
+            lightImage = .local(appleLogoLightStyle)
+        }
+        
+        let lightStyle = SocialLoginButtonStyle(logo: lightImage,
+                                                titleColor: .white,
+                                                backgroundColor: .black,
+                                                borderColor: nil)
+        
+        var darkImage: SourceImage?
+        
+        if let appleLogoDarkStyle = appleLogo.vc_tintedImage(usingColor: .black) {
+            darkImage = .local(appleLogoDarkStyle)
+        }
+        
+        let darkStyle = SocialLoginButtonStyle(logo: darkImage,
+                                               titleColor: .black,
+                                               backgroundColor: .white,
+                                               borderColor: nil)
+        
+        let defaultStyle: SocialLoginButtonStyle = lightStyle
+                        
+        let styles: [String: SocialLoginButtonStyle] = [
+            ThemeIdentifier.light.rawValue: lightStyle,
+            ThemeIdentifier.dark.rawValue: darkStyle,
+            ThemeIdentifier.black.rawValue: darkStyle
+        ]
+        
+        return (defaultStyle, styles)
+    }
+    
+    private func buildGoogleButtonStyles() -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        let logo = Asset.Images.socialLoginButtonGoogle.image
+        
+        let lightImage: SourceImage = .local(logo)
+        
+        let lightStyle = SocialLoginButtonStyle(logo: lightImage,
+                                                titleColor: UIColor(white: 0, alpha: 0.54),
+                                                backgroundColor: .white,
+                                                borderColor: .black)
+        
+        var darkImage: SourceImage?
+        
+        if let logoDarkStyle = logo.vc_tintedImage(usingColor: .white) {
+            darkImage = .local(logoDarkStyle)
+        }
+        
+        let darkStyle = SocialLoginButtonStyle(logo: darkImage,
+                                               titleColor: .white,
+                                               backgroundColor: UIColor(rgb: 0x4285F4),
+                                               borderColor: nil)
+        
+        let defaultStyle: SocialLoginButtonStyle = lightStyle
+        
+        let styles: [String: SocialLoginButtonStyle] = [
+            ThemeIdentifier.light.rawValue: lightStyle,
+            ThemeIdentifier.dark.rawValue: darkStyle,
+            ThemeIdentifier.black.rawValue: darkStyle
+        ]
+        
+        return (defaultStyle, styles)
+    }
+    
+    private func buildTwitterButtonStyles() -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        let defaultStyle = SocialLoginButtonStyle(logo: .local(Asset.Images.socialLoginButtonTwitter.image),
+                                                  titleColor: .white,
+                                                  backgroundColor: UIColor(rgb: 0x47ACDF),
+                                                  borderColor: nil)
+        return (defaultStyle, [:])
+    }
+    
+    private func buildFacebookButtonStyles() -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        let defaultStyle = SocialLoginButtonStyle(logo: .local(Asset.Images.socialLoginButtonFacebook.image),
+                                                  titleColor: .white,
+                                                  backgroundColor: UIColor(rgb: 0x3C5A99),
+                                                  borderColor: nil)
+        return (defaultStyle, [:])
+    }
+    
+    private func buildGitHubButtonStyles() -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        var lightImage: SourceImage?
+        
+        let githubLogo = Asset.Images.socialLoginButtonGithub.image
+        
+        if let githubLogoLightStyle = githubLogo.vc_tintedImage(usingColor: .black) {
+            lightImage = .local(githubLogoLightStyle)
+        }
+        
+        let lightStyle = SocialLoginButtonStyle(logo: lightImage,
+                                                titleColor: .black,
+                                                backgroundColor: .white,
+                                                borderColor: .black)
+        
+        var darkImage: SourceImage?
+        
+        if let githubLogoDarkStyle = githubLogo.vc_tintedImage(usingColor: .white) {
+            darkImage = .local(githubLogoDarkStyle)
+        }
+        
+        let darkStyle = SocialLoginButtonStyle(logo: darkImage,
+                                               titleColor: .white,
+                                               backgroundColor: .black,
+                                               borderColor: .white)
+        
+        let defaultStyle: SocialLoginButtonStyle = lightStyle
+        
+        let styles: [String: SocialLoginButtonStyle] = [
+            ThemeIdentifier.light.rawValue: lightStyle,
+            ThemeIdentifier.dark.rawValue: darkStyle,
+            ThemeIdentifier.black.rawValue: darkStyle
+        ]
+        
+        return (defaultStyle, styles)
+    }
+    
+    private func buildDefaultButtonStyles(with image: SourceImage?) -> (SocialLoginButtonStyle, [String: SocialLoginButtonStyle]) {
+        
+        let lightStyle = SocialLoginButtonStyle(logo: image,
+                                                titleColor: .black,
+                                                backgroundColor: .white,
+                                                borderColor: .black)
+        
+        let darkStyle = SocialLoginButtonStyle(logo: image,
+                                               titleColor: .white,
+                                               backgroundColor: .black,
+                                               borderColor: .white)
+        
+        let defaultStyle: SocialLoginButtonStyle = lightStyle
+        
+        let styles: [String: SocialLoginButtonStyle] = [
+            ThemeIdentifier.light.rawValue: lightStyle,
+            ThemeIdentifier.dark.rawValue: darkStyle,
+            ThemeIdentifier.black.rawValue: darkStyle
+        ]
+        
+        return (defaultStyle, styles)
+    }
+}