implement basic full message webview

DcCore/DcCore/DC/Wrapper.swift

@@ -1019,6 +1019,13 @@ public class DcMsg {
         return dc_msg_has_html(messagePointer) == 1
     }
 
+    public lazy var html: String = {
+        guard let cString = dc_get_msg_html(DcContext.shared.contextPointer, dc_msg_get_id(messagePointer)) else { return "" }
+        let swiftString = String(cString: cString)
+        dc_str_unref(cString)
+        return swiftString
+    }()
+
     public var setupCodeBegin: String {
         guard let cString = dc_msg_get_setupcodebegin(messagePointer) else { return "" }
         let swiftString = String(cString: cString)

deltachat-ios.xcodeproj/project.pbxproj

@@ -35,6 +35,8 @@
 		304219D3243F588500516852 /* DcCore.framework in Embed Frameworks */ = {isa = PBXBuildFile; fileRef = 304219D1243F588500516852 /* DcCore.framework */; settings = {ATTRIBUTES = (CodeSignOnCopy, RemoveHeadersOnCopy, ); }; };
 		304219D92440734A00516852 /* DcMsg+Extension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 304219D82440734A00516852 /* DcMsg+Extension.swift */; };
 		304F5E44244F571C00462538 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 7A9FB14A1FB061E2001FEA36 /* Assets.xcassets */; };
+		304F769525DD237B0094B5E2 /* WebViewViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 304F769425DD237B0094B5E2 /* WebViewViewController.swift */; };
+		304F769925DD23D70094B5E2 /* FullMessageViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 304F769825DD23D70094B5E2 /* FullMessageViewController.swift */; };
 		3052C60A253F082E007D13EA /* MessageLabelDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3052C609253F082E007D13EA /* MessageLabelDelegate.swift */; };
 		3052C60E253F088E007D13EA /* DetectorType.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3052C60D253F088E007D13EA /* DetectorType.swift */; };
 		3057027F24C5B2F800D84EFC /* ChatListViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3057027E24C5B2F800D84EFC /* ChatListViewModel.swift */; };
@@ -237,6 +239,8 @@
 		303492CE2587C2DC00A523D0 /* ChatInputBar.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChatInputBar.swift; sourceTree = "<group>"; };
 		304219D1243F588500516852 /* DcCore.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = DcCore.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		304219D82440734A00516852 /* DcMsg+Extension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "DcMsg+Extension.swift"; sourceTree = "<group>"; };
+		304F769425DD237B0094B5E2 /* WebViewViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WebViewViewController.swift; sourceTree = "<group>"; };
+		304F769825DD23D70094B5E2 /* FullMessageViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FullMessageViewController.swift; sourceTree = "<group>"; };
 		3052C609253F082E007D13EA /* MessageLabelDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MessageLabelDelegate.swift; sourceTree = "<group>"; };
 		3052C60D253F088E007D13EA /* DetectorType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DetectorType.swift; sourceTree = "<group>"; };
 		3057027E24C5B2F800D84EFC /* ChatListViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ChatListViewModel.swift; sourceTree = "<group>"; };
@@ -759,6 +763,8 @@
 				AE851ACF227DF50900ED86F0 /* GroupChatDetailViewController.swift */,
 				AEE6EC3E2282C59C00EDC689 /* GroupMembersViewController.swift */,
 				AE19887423EB264000B4CD5F /* HelpViewController.swift */,
+				304F769425DD237B0094B5E2 /* WebViewViewController.swift */,
+				304F769825DD23D70094B5E2 /* FullMessageViewController.swift */,
 				AEE6EC402282DF5700EDC689 /* MailboxViewController.swift */,
 				785BE16721E247F1003BE98C /* MessageInfoViewController.swift */,
 				7AE0A5481FC42F65005ECB4B /* NewChatViewController.swift */,
@@ -1311,8 +1317,10 @@
 				305961CD2346125100C80F33 /* UIEdgeInsets+Extensions.swift in Sources */,
 				30EF7324252FF15F00E2C54A /* MessageLabel.swift in Sources */,
 				30C0D49D237C4908008E2A0E /* CertificateCheckController.swift in Sources */,
+				304F769525DD237B0094B5E2 /* WebViewViewController.swift in Sources */,
 				7092474120B3869500AF8799 /* ContactDetailViewController.swift in Sources */,
 				30F9B9EC235F2116006E7ACF /* MessageCounter.swift in Sources */,
+				304F769925DD23D70094B5E2 /* FullMessageViewController.swift in Sources */,
 				AE0AA952247800E700D42A7F /* GalleryCell.swift in Sources */,
 				AE0AA958247834A400D42A7F /* Date+Extension.swift in Sources */,
 				307D822E241669C7006D2490 /* LocationManager.swift in Sources */,

deltachat-ios/Chat/ChatViewController.swift

@@ -1269,6 +1269,15 @@ class ChatViewController: UITableViewController {
 // MARK: - BaseMessageCellDelegate
 extension ChatViewController: BaseMessageCellDelegate {
 
+    @objc func fullMessageTapped(indexPath: IndexPath) {
+        if handleUIMenu() || handleSelection(indexPath: indexPath) {
+            return
+        }
+        let msg = DcMsg(id: messageIds[indexPath.row])
+        let fullMessageViewController = FullMessageViewController(message: msg)
+        navigationController?.pushViewController(fullMessageViewController, animated: true)
+    }
+
     @objc func quoteTapped(indexPath: IndexPath) {
         if handleSelection(indexPath: indexPath) { return }
         _ = handleUIMenu()

deltachat-ios/Chat/Views/Cells/BaseMessageCell.swift

@@ -133,6 +133,7 @@ public class BaseMessageCell: UITableViewCell {
         button.setTitleColor(.gray, for: .highlighted)
         button.titleLabel?.lineBreakMode = .byWordWrapping
         button.titleLabel?.textAlignment = .center
+        button.addTarget(self, action: #selector(onFullMessageButtonTapped), for: .touchUpInside)
         return button
     }()
 
@@ -258,6 +259,12 @@ public class BaseMessageCell: UITableViewCell {
         }
     }
 
+    @objc func onFullMessageButtonTapped() {
+        if let tableView = self.superview as? UITableView, let indexPath = tableView.indexPath(for: self) {
+            baseDelegate?.fullMessageTapped(indexPath: indexPath)
+        }
+    }
+
     // update classes inheriting BaseMessageCell first before calling super.update(...)
     func update(msg: DcMsg, messageStyle: UIRectCorner, isAvatarVisible: Bool, isGroup: Bool) {
         if msg.isFromCurrentSender {
@@ -550,4 +557,5 @@ public protocol BaseMessageCellDelegate: class {
     func avatarTapped(indexPath: IndexPath)
     func textTapped(indexPath: IndexPath)
     func quoteTapped(indexPath: IndexPath)
+    func fullMessageTapped(indexPath: IndexPath)
 }

deltachat-ios/Controller/FullMessageViewController.swift

@@ -0,0 +1,66 @@
+import UIKit
+import WebKit
+import DcCore
+
+class FullMessageViewController: WebViewViewController {
+
+    var message: DcMsg
+    private var loadUrlAllowed = false
+
+    // Block just everything :)
+    let blockRules = """
+    [
+        {
+            "trigger": {
+                "url-filter": ".*"
+            },
+            "action": {
+                "type": "block"
+            }
+        }
+    ]
+    """
+    
+
+    init(message: DcMsg) {
+        self.message = message
+        super.init()
+    }
+
+    required init?(coder: NSCoder) {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        self.title = String.localized("chat_input_placeholder")
+    }
+
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        WKContentRuleListStore.default().compileContentRuleList(
+                forIdentifier: "ContentBlockingRules",
+                encodedContentRuleList: blockRules) { (contentRuleList, error) in
+
+            guard let contentRuleList = contentRuleList, error == nil else {
+                return
+            }
+
+            let configuration = self.webView.configuration
+            configuration.userContentController.add(contentRuleList)
+            self.loadHtml()
+
+        }
+    }
+
+    private func loadHtml() {
+        // execute in background thread because file loading would blockui for a few milliseconds
+        DispatchQueue.global(qos: .background).async { [weak self] in
+            guard let self = self else { return }
+            let html = self.message.html
+            DispatchQueue.main.async {
+                self.webView.loadHTMLString(html, baseURL: nil)
+            }
+        }
+    }
+}