forwarding/new message/attachment permissions

enhances #159 PR, hopefully fixes #164 issue

qml/js/functions.js

@@ -406,3 +406,28 @@ function handleErrorMessage(code, message) {
         appNotification.show(message);
     }
 }
+
+function getMessagesNeededForwardPermissions(messages) {
+    var neededPermissions = ["can_send_messages"];
+
+    var mediaMessageTypes = ["messageAudio", "messageDocument", "messagePhoto", "messageVideo", "messageVideoNote", "messageVoiceNote"];
+    var otherMessageTypes = ["messageAnimation", "messageGame", "messageSticker"]
+    for(var i = 0; i < messages.length; i += 1) {
+        var type = messages[i]["content"]["@type"];
+        var permission = "";
+        if(type === "messageText") {
+            continue;
+        } else if(type === "messagePoll") {
+            permission = "can_send_polls";
+        } else if(mediaMessageTypes.indexOf(type) > -1) {
+            permission = "can_send_media_messages";
+        } else if(otherMessageTypes.indexOf(type) > -1) {
+            permission = "can_send_other_messages";
+        }
+
+        if(permission !== "" && neededPermissions.indexOf(permission) === -1) {
+            neededPermissions.push(permission);
+        }
+    }
+    return neededPermissions;
+}

qml/pages/ChatPage.qml

@@ -266,6 +266,17 @@ Page {
         forwardMessagesTimer.messageIds = messageIds;
         forwardMessagesTimer.start();
     }
+    function hasSendPrivilege(privilege) {
+        return chatPage.isPrivateChat ||
+                chatGroupInformation &&
+                (
+                    (chatGroupInformation.status["@type"] === "chatMemberStatusMember" && chatGroupInformation.status.permissions[privilege])
+                    || chatGroupInformation.status["@type"] === "chatMemberStatusAdministrator"
+                    || chatGroupInformation.status["@type"] === "chatMemberStatusCreator"
+                    || (chatGroupInformation.status["@type"] === "chatMemberStatusRestricted" && chatInformation.permissions[privilege])
+                 )
+    }
+
     Timer {
         id: forwardMessagesTimer
         interval: 200
@@ -822,7 +833,7 @@ Page {
                 topPadding: Theme.paddingSmall
                 width: parent.width - ( 2 * Theme.horizontalPageMargin )
                 anchors.horizontalCenter: parent.horizontalCenter
-                visible: !chatPage.isChannel
+                visible: chatPage.hasSendPrivilege("can_send_messages")
                 height: visible ? implicitHeight : 0
                 Behavior on opacity { FadeAnimation {} }
 
@@ -859,7 +870,7 @@ Page {
                     layoutDirection: Qt.RightToLeft
                     spacing: Theme.paddingMedium
                     IconButton {
-                        id: imageAttachmentButton
+                        visible: chatPage.hasSendPrivilege("can_send_media_messages")
                         icon.source: "image://theme/icon-m-image"
                         onClicked: {
                             var picker = pageStack.push("Sailfish.Pickers.ImagePickerPage");
@@ -874,7 +885,7 @@ Page {
                         }
                     }
                     IconButton {
-                        id: videoAttachmentButton
+                        visible: chatPage.hasSendPrivilege("can_send_media_messages")
                         icon.source: "image://theme/icon-m-video"
                         onClicked: {
                             var picker = pageStack.push("Sailfish.Pickers.VideoPickerPage");
@@ -889,7 +900,7 @@ Page {
                         }
                     }
                     IconButton {
-                        id: documentAttachmentButton
+                        visible: chatPage.hasSendPrivilege("can_send_media_messages")
                         icon.source: "image://theme/icon-m-document"
                         onClicked: {
                             var picker = pageStack.push("Sailfish.Pickers.DocumentPickerPage");
@@ -905,6 +916,8 @@ Page {
                     }
 
                     IconButton {
+
+                        visible: chatPage.hasSendPrivilege("can_send_other_messages")
                         icon.source: "../../images/icon-m-sticker.svg"
                         icon.sourceSize {
                             width: Theme.iconSizeMedium
@@ -917,10 +930,7 @@ Page {
                         }
                     }
                     IconButton {
-                        visible: !chatPage.isPrivateChat && chatGroupInformation &&
+                        visible: !chatPage.isPrivateChat && chatPage.hasSendPrivilege("can_send_polls")
-                                 (chatGroupInformation.status["@type"] === "chatMemberStatusCreator"
-                                  || chatGroupInformation.status["@type"] === "chatMemberStatusAdministrator"
-                                  || (chatGroupInformation.status["@type"] === "chatMemberStatusMember" && chatInformation.permissions.can_send_polls))
                         icon.source: "image://theme/icon-m-question"
                         onClicked: {
                             pageStack.push(Qt.resolvedUrl("../pages/PollCreationPage.qml"), { "chatId" : chatInformation.id, groupName: chatInformation.title});
@@ -1205,12 +1215,11 @@ Page {
                             icon.source: "image://theme/icon-m-forward"
                             onClicked: {
                                 var ids = Functions.getMessagesArrayIds(chatPage.selectedMessages);
-
+                                var neededPermissions = Functions.getMessagesNeededForwardPermissions(chatPage.selectedMessages);
                                 var chatId = chatInformation.id;
-
                                 pageStack.push(Qt.resolvedUrl("../pages/ChatSelectionPage.qml"), {
                                     headerDescription: qsTr("Forward %n messages", "dialog header", ids.length).arg(ids.length),
-                                    payload: {fromChatId: chatId, messageIds:ids},
+                                    payload: {fromChatId: chatId, messageIds:ids, neededPermissions: neededPermissions},
                                     state: "forwardMessages"
                                 });
                             }

qml/pages/ChatSelectionPage.qml

@@ -31,6 +31,10 @@ Dialog {
     acceptDestinationReplaceTarget: pageStack.find( function(page){ return(page._depth === 0)} )
     property alias headerTitle: pageHeader.title
     property alias headerDescription: pageHeader.description
+    /*
+        payload dependent on chatSelectionPage.state
+         - forwardMessages: {fromChatId, messageIds, neededPermissions}
+    */
     property var payload: ({})
 
     onAccepted: {
@@ -38,6 +42,7 @@ Dialog {
         case "forwardMessages":
             acceptDestinationInstance.forwardMessages(payload.fromChatId, payload.messageIds)
             break;
+        // future uses of chat selection can be processed here
         }
     }
 
@@ -62,7 +67,52 @@ Dialog {
         model: chatListModel
         delegate: ChatListViewItem {
             ownUserId: overviewPage.ownUserId
+            Loader { // checking permissions takes a while, so we defer those calculations
+                id: visibleLoader
+                asynchronous: true
+                sourceComponent: Component {
+                    QtObject {
+                        property var chatGroupInformation: ({})
+                        property bool visible: false
+                        Component.onCompleted: {
+                            if(chatSelectionPage.state === "forwardMessages") {
+                                var chatType = display.type['@type'];
+                                if(chatType === "chatTypePrivate" || chatType === "chatTypeSecret") {
+                                    visible = true
+                                    return;
+                                }
+                                else if (chatType === "chatTypeBasicGroup" ) {
+                                    chatGroupInformation = tdLibWrapper.getBasicGroup(display.type.basic_group_id);
+                                }
+                                else if (chatType === "chatTypeSupergroup" ) {
+                                    chatGroupInformation = tdLibWrapper.getSuperGroup(display.type.supergroup_id);
+                                }
 
+                                visible = (chatGroupInformation.status["@type"] === "chatMemberStatusCreator"
+                                        || chatGroupInformation.status["@type"] === "chatMemberStatusAdministrator"
+                                        || (chatGroupInformation.status["@type"] === "chatMemberStatusMember"
+                                                && chatSelectionPage.payload.neededPermissions.every(function(neededPermission){
+                                                    return display.permissions[neededPermission];
+                                                })
+                                            )
+                                        );
+                            } else { // future uses of chat selection can be processed here
+                                visible = true;
+                            }
+                        }
+                    }
+                }
+            }
+
+            property bool valid: visibleLoader && visibleLoader.item && visibleLoader.item.visible
+            opacity: valid ? 1.0 : 0.5
+
+            Behavior on opacity { FadeAnimation {}}
+            Behavior on height { NumberAnimation {}}
+
+            // normal height while calculating, otherwise all elements get displayed at once
+            height: !visibleLoader.item || visible ? contentHeight : 0
+            enabled: valid
             onClicked: {
                 var chat = tdLibWrapper.getChat(display.id);
                 switch(chatSelectionPage.state) {