fix: QWebChannel not available

src/app/provider/view.nim

@@ -3,8 +3,79 @@ import ../../status/status
 import ../../status/libstatus/types
 import ../../status/libstatus/core
 import ../../status/libstatus/settings as status_settings
-import json
+import json, json_serialization, sets, strutils
-import sets
+import chronicles
+
+const AUTH_METHODS = toHashSet(["eth_accounts", "eth_coinbase", "eth_sendTransaction", "eth_sign", "keycard_signTypedData", "eth_signTypedData", "personal_sign", "personal_ecRecover"])
+const SIGN_METHODS = toHashSet(["eth_sendTransaction", "personal_sign", "eth_signTypedData", "eth_signTypedData_v3"])
+const ACC_METHODS = toHashSet(["eth_accounts", "eth_coinbase"])
+
+logScope:
+  topics = "provider-view"
+
+type
+  RequestTypes {.pure.} = enum
+    Web3SendAsyncReadOnly = "web3-send-async-read-only",
+    HistoryStateChanged = "history-state-changed",
+    APIRequest = "api-request"
+    Unknown = "unknown"
+
+  ResponseTypes {.pure.} = enum
+    Web3SendAsyncCallback = "web3-send-async-callback",
+    APIResponse = "api-response",
+    Web3ResponseError = "web3-response-error"
+
+  Permissions {.pure.} = enum
+    Web3 = "web3",
+    ContactCode = "contact-code"
+    Unknown = "unknown"
+
+type
+  Payload = ref object
+    id: JsonNode
+    rpcMethod: string
+
+  Web3SendAsyncReadOnly = ref object
+    messageId: JsonNode
+    payload: Payload
+    request: string
+
+  APIRequest = ref object
+    messageId: JsonNode
+    permission: Permissions
+
+proc requestType(message: string): RequestTypes = 
+  let data = message.parseJson
+  result = RequestTypes.Unknown
+  try:
+    result = parseEnum[RequestTypes](data["type"].getStr())
+  except:
+    warn "Unknown request type received", value=data["permission"].getStr()
+
+proc toWeb3SendAsyncReadOnly(message: string): Web3SendAsyncReadOnly =
+  let data = message.parseJson
+  result = Web3SendAsyncReadOnly(
+    messageId: data["messageId"],
+    request: $data["payload"],
+    payload: Payload(
+      id: data["payload"]["id"],
+      rpcMethod: data["payload"]["method"].getStr()
+    )
+  )
+
+proc toAPIRequest(message: string): APIRequest = 
+  let data = message.parseJson
+  var permission = Permissions.Unknown
+
+  try:
+    permission = parseEnum[Permissions](data["permission"].getStr())
+  except:
+    warn "Unknown permission requested", value=data["permission"].getStr()
+
+  result = APIRequest(
+    messageId: data["messageId"],
+    permission: permission
+  )
 
 QtObject:
   type Web3ProviderView* = ref object of QObject
@@ -22,82 +93,73 @@ QtObject:
     result.status = status
     result.setup
 
-  proc web3AsyncReadOnly*(self: Web3ProviderView, data: JsonNode): JsonNode =
+  proc process(data: Web3SendAsyncReadOnly): string =
-    let messageId = data["messageId"]
+    if AUTH_METHODS.contains(data.payload.rpcMethod): # TODO: && if the dapp does not have the "web3" permission:
-    let messageType = "web3-send-async-callback"
+      return $ %* {
-    let payloadId = data["payload"]["id"]
+        "type": ResponseTypes.Web3SendAsyncCallback,
-    let rpcMethod = data["payload"]["method"].getStr()
+        "messageId": data.messageId,
-
-    let authMethods = toHashSet(["eth_accounts", "eth_coinbase", "eth_sendTransaction", "eth_sign", "keycard_signTypedData", "eth_signTypedData", "personal_sign", "personal_ecRecover"])
-    let signMethods = toHashSet(["eth_sendTransaction", "personal_sign", "eth_signTypedData", "eth_signTypedData_v3"])
-    let accMethods = toHashSet(["eth_accounts", "eth_coinbase"])
-
-    if authMethods.contains(rpcMethod): # TODO: && if the dapp does not have the "web3" permission:
-      return %* {
-        "type": messageType,
-        "messageId": messageId,
         "error": {
           "code": 4100
         }
       }
     
-    if signMethods.contains(rpcMethod):
+    if SIGN_METHODS.contains(data.payload.rpcMethod):
-      return %* { # TODO: send transaction, return transaction hash, etc etc. Disabled in the meantime
+      return $ %* { # TODO: send transaction, return transaction hash, etc etc. Disabled in the meantime
-        "type": messageType,
+        "type": ResponseTypes.Web3SendAsyncCallback,
-        "messageId": messageId,
+        "messageId": data.messageId,
         "error": {
           "code": 4100
         }
       }
     
-    if accMethods.contains(rpcMethod):
+    if ACC_METHODS.contains(data.payload.rpcMethod):
         let dappAddress = status_settings.getSetting[string](Setting.DappsAddress)
-        return %* {
+        return $ %* {
-          "type": messageType,
+          "type": ResponseTypes.Web3SendAsyncCallback,
-          "messageId": messageId,
+          "messageId": data.messageId,
           "payload": {
             "jsonrpc": "2.0",
-            "id": payloadId,
+            "id": data.payload.id,
-            "result": if rpcMethod == "eth_coinbase": newJString(dappAddress) else: %*[dappAddress]
+            "result": if data.payload.rpcMethod == "eth_coinbase": newJString(dappAddress) else: %*[dappAddress]
             }
           }
     
-    let rpcResult = callRPC($data["payload"])
+    let rpcResult = callRPC(data.request)
 
-    return %* {
+    return $ %* {
-      "type": messageType,
+      "type": ResponseTypes.Web3SendAsyncCallback,
-      "messageId": messageId,
+      "messageId": data.messageId,
       "error": (if rpcResult == "": newJString("web3-response-error") else: newJNull()),
       "result": rpcResult.parseJson
     }
 
 
-  proc apiRequest*(self: Web3ProviderView, request: JsonNode): JsonNode =
+  proc process*(data: APIRequest): string =
     # TODO: Do a proper implementation. Must ask for approval from the user.
     #       Probably this should happen in BrowserLayout.qml
     
-    let permission = request{"permission"}.getStr()
+    var value:JsonNode = case data.permission
-    var data:JsonNode;
+    of Permissions.Web3: %* [status_settings.getSetting[string](Setting.DappsAddress, "0x0000000000000000000000000000000000000000")]
-    if permission == "web3": 
+    of Permissions.ContactCode: %* status_settings.getSetting[string](Setting.PublicKey, "0x0")
-      data = %* [status_settings.getSetting[string](Setting.DappsAddress, "0x0000000000000000000000000000000000000000")]
+    of Permissions.Unknown: newJNull()
 
-    if permission == "contact-code":
+    return $ %* {
-      data = %* status_settings.getSetting[string](Setting.PublicKey, "0x0")
+      "type": $ResponseTypes.APIResponse,
-
+      "isAllowed": true, # TODO isAllowed or permission is unknown
-    result = %* {
+      "permission": data.permission,
-      "type": "api-response",
+      "messageId": data.messageId,
-      "isAllowed": true, # TODO
+      "data": value
-      "permission": permission,
-      "messageId": request["messageId"].getInt(),
-      "data": data
     }
 
   proc postMessage*(self: Web3ProviderView, message: string): string {.slot.} =
-    let data = message.parseJson
+    let requestType = message.requestType()
-    case data{"type"}.getStr():
+
-    of "web3-send-async-read-only": $self.web3AsyncReadOnly(data)
+    info "Provider request received", value=requestType
-    of "history-state-changed": """{"type":"TODO-IMPLEMENT-THIS"}""" ############# TODO:
+
-    of "api-request": $self.apiRequest(data)
+    case requestType:
+    of RequestTypes.Web3SendAsyncReadOnly: message.toWeb3SendAsyncReadOnly().process()
+    of RequestTypes.HistoryStateChanged: """{"type":"TODO-IMPLEMENT-THIS"}""" ############# TODO:
+    of RequestTypes.APIRequest: message.toAPIRequest().process()
     else:  """{"type":"TODO-IMPLEMENT-THIS"}""" ##################### TODO:
 
   proc getNetworkId*(self: Web3ProviderView): int {.slot.} = getCurrentNetworkDetails().config.networkId

ui/app/AppLayouts/Browser/BrowserLayout.qml

@@ -16,12 +16,6 @@ Item {
         offTheRecord: true // Private Mode on
         persistentCookiesPolicy:  WebEngineProfile.NoPersistentCookies
         userScripts: [
-            WebEngineScript {
-                injectionPoint: WebEngineScript.DocumentCreation
-                name: "QWebChannel"
-                sourceUrl: "qrc:///qtwebchannel/qwebchannel.js"
-                worldId: WebEngineScript.MainWorld // TODO: check https://doc.qt.io/qt-5/qml-qtwebengine-webenginescript.html#worldId-prop 
-            },
             WebEngineScript {
                 injectionPoint: WebEngineScript.DocumentCreation
                 sourceUrl:  Qt.resolvedUrl("provider.js")

ui/app/AppLayouts/Browser/provider.js

@@ -1,3 +1,797 @@
+// qwebchannel.js
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtWebChannel module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+"use strict";
+
+var QWebChannelMessageTypes = {
+    signal: 1,
+    propertyUpdate: 2,
+    init: 3,
+    idle: 4,
+    debug: 5,
+    invokeMethod: 6,
+    connectToSignal: 7,
+    disconnectFromSignal: 8,
+    setProperty: 9,
+    response: 10,
+};
+
+var QWebChannel = function(transport, initCallback)
+{
+    if (typeof transport !== "object" || typeof transport.send !== "function") {
+        console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
+                      " Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
+        return;
+    }
+
+    var channel = this;
+    this.transport = transport;
+
+    this.send = function(data)
+    {
+        if (typeof(data) !== "string") {
+            data = JSON.stringify(data);
+        }
+        channel.transport.send(data);
+    }
+
+    this.transport.onmessage = function(message)
+    {
+        var data = message.data;
+        if (typeof data === "string") {
+            data = JSON.parse(data);
+        }
+        switch (data.type) {
+            case QWebChannelMessageTypes.signal:
+                channel.handleSignal(data);
+                break;
+            case QWebChannelMessageTypes.response:
+                channel.handleResponse(data);
+                break;
+            case QWebChannelMessageTypes.propertyUpdate:
+                channel.handlePropertyUpdate(data);
+                break;
+            default:
+                console.error("invalid message received:", message.data);
+                break;
+        }
+    }
+
+    this.execCallbacks = {};
+    this.execId = 0;
+    this.exec = function(data, callback)
+    {
+        if (!callback) {
+            // if no callback is given, send directly
+            channel.send(data);
+            return;
+        }
+        if (channel.execId === Number.MAX_VALUE) {
+            // wrap
+            channel.execId = Number.MIN_VALUE;
+        }
+        if (data.hasOwnProperty("id")) {
+            console.error("Cannot exec message with property id: " + JSON.stringify(data));
+            return;
+        }
+        data.id = channel.execId++;
+        channel.execCallbacks[data.id] = callback;
+        channel.send(data);
+    };
+
+    this.objects = {};
+
+    this.handleSignal = function(message)
+    {
+        var object = channel.objects[message.object];
+        if (object) {
+            object.signalEmitted(message.signal, message.args);
+        } else {
+            console.warn("Unhandled signal: " + message.object + "::" + message.signal);
+        }
+    }
+
+    this.handleResponse = function(message)
+    {
+        if (!message.hasOwnProperty("id")) {
+            console.error("Invalid response message received: ", JSON.stringify(message));
+            return;
+        }
+        channel.execCallbacks[message.id](message.data);
+        delete channel.execCallbacks[message.id];
+    }
+
+    this.handlePropertyUpdate = function(message)
+    {
+        for (var i in message.data) {
+            var data = message.data[i];
+            var object = channel.objects[data.object];
+            if (object) {
+                object.propertyUpdate(data.signals, data.properties);
+            } else {
+                console.warn("Unhandled property update: " + data.object + "::" + data.signal);
+            }
+        }
+        channel.exec({type: QWebChannelMessageTypes.idle});
+    }
+
+    this.debug = function(message)
+    {
+        channel.send({type: QWebChannelMessageTypes.debug, data: message});
+    };
+
+    channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
+        for (var objectName in data) {
+            var object = new QObject(objectName, data[objectName], channel);
+        }
+        // now unwrap properties, which might reference other registered objects
+        for (var objectName in channel.objects) {
+            channel.objects[objectName].unwrapProperties();
+        }
+        if (initCallback) {
+            initCallback(channel);
+        }
+        channel.exec({type: QWebChannelMessageTypes.idle});
+    });
+};
+
+function QObject(name, data, webChannel)
+{
+    this.__id__ = name;
+    webChannel.objects[name] = this;
+
+    // List of callbacks that get invoked upon signal emission
+    this.__objectSignals__ = {};
+
+    // Cache of all properties, updated when a notify signal is emitted
+    this.__propertyCache__ = {};
+
+    var object = this;
+
+    // ----------------------------------------------------------------------
+
+    this.unwrapQObject = function(response)
+    {
+        if (response instanceof Array) {
+            // support list of objects
+            var ret = new Array(response.length);
+            for (var i = 0; i < response.length; ++i) {
+                ret[i] = object.unwrapQObject(response[i]);
+            }
+            return ret;
+        }
+        if (!response
+            || !response["__QObject*__"]
+            || response.id === undefined) {
+            return response;
+        }
+
+        var objectId = response.id;
+        if (webChannel.objects[objectId])
+            return webChannel.objects[objectId];
+
+        if (!response.data) {
+            console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
+            return;
+        }
+
+        var qObject = new QObject( objectId, response.data, webChannel );
+        qObject.destroyed.connect(function() {
+            if (webChannel.objects[objectId] === qObject) {
+                delete webChannel.objects[objectId];
+                // reset the now deleted QObject to an empty {} object
+                // just assigning {} though would not have the desired effect, but the
+                // below also ensures all external references will see the empty map
+                // NOTE: this detour is necessary to workaround QTBUG-40021
+                var propertyNames = [];
+                for (var propertyName in qObject) {
+                    propertyNames.push(propertyName);
+                }
+                for (var idx in propertyNames) {
+                    delete qObject[propertyNames[idx]];
+                }
+            }
+        });
+        // here we are already initialized, and thus must directly unwrap the properties
+        qObject.unwrapProperties();
+        return qObject;
+    }
+
+    this.unwrapProperties = function()
+    {
+        for (var propertyIdx in object.__propertyCache__) {
+            object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
+        }
+    }
+
+    function addSignal(signalData, isPropertyNotifySignal)
+    {
+        var signalName = signalData[0];
+        var signalIndex = signalData[1];
+        object[signalName] = {
+            connect: function(callback) {
+                if (typeof(callback) !== "function") {
+                    console.error("Bad callback given to connect to signal " + signalName);
+                    return;
+                }
+
+                object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
+                object.__objectSignals__[signalIndex].push(callback);
+
+                if (!isPropertyNotifySignal && signalName !== "destroyed") {
+                    // only required for "pure" signals, handled separately for properties in propertyUpdate
+                    // also note that we always get notified about the destroyed signal
+                    webChannel.exec({
+                        type: QWebChannelMessageTypes.connectToSignal,
+                        object: object.__id__,
+                        signal: signalIndex
+                    });
+                }
+            },
+            disconnect: function(callback) {
+                if (typeof(callback) !== "function") {
+                    console.error("Bad callback given to disconnect from signal " + signalName);
+                    return;
+                }
+                object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
+                var idx = object.__objectSignals__[signalIndex].indexOf(callback);
+                if (idx === -1) {
+                    console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
+                    return;
+                }
+                object.__objectSignals__[signalIndex].splice(idx, 1);
+                if (!isPropertyNotifySignal && object.__objectSignals__[signalIndex].length === 0) {
+                    // only required for "pure" signals, handled separately for properties in propertyUpdate
+                    webChannel.exec({
+                        type: QWebChannelMessageTypes.disconnectFromSignal,
+                        object: object.__id__,
+                        signal: signalIndex
+                    });
+                }
+            }
+        };
+    }
+
+    /**
+     * Invokes all callbacks for the given signalname. Also works for property notify callbacks.
+     */
+    function invokeSignalCallbacks(signalName, signalArgs)
+    {
+        var connections = object.__objectSignals__[signalName];
+        if (connections) {
+            connections.forEach(function(callback) {
+                callback.apply(callback, signalArgs);
+            });
+        }
+    }
+
+    this.propertyUpdate = function(signals, propertyMap)
+    {
+        // update property cache
+        for (var propertyIndex in propertyMap) {
+            var propertyValue = propertyMap[propertyIndex];
+            object.__propertyCache__[propertyIndex] = propertyValue;
+        }
+
+        for (var signalName in signals) {
+            // Invoke all callbacks, as signalEmitted() does not. This ensures the
+            // property cache is updated before the callbacks are invoked.
+            invokeSignalCallbacks(signalName, signals[signalName]);
+        }
+    }
+
+    this.signalEmitted = function(signalName, signalArgs)
+    {
+        invokeSignalCallbacks(signalName, signalArgs);
+    }
+
+    function addMethod(methodData)
+    {
+        var methodName = methodData[0];
+        var methodIdx = methodData[1];
+        object[methodName] = function() {
+            var args = [];
+            var callback;
+            for (var i = 0; i < arguments.length; ++i) {
+                if (typeof arguments[i] === "function")
+                    callback = arguments[i];
+                else
+                    args.push(arguments[i]);
+            }
+
+            webChannel.exec({
+                "type": QWebChannelMessageTypes.invokeMethod,
+                "object": object.__id__,
+                "method": methodIdx,
+                "args": args
+            }, function(response) {
+                if (response !== undefined) {
+                    var result = object.unwrapQObject(response);
+                    if (callback) {
+                        (callback)(result);
+                    }
+                }
+            });
+        };
+    }
+
+    function bindGetterSetter(propertyInfo)
+    {
+        var propertyIndex = propertyInfo[0];
+        var propertyName = propertyInfo[1];
+        var notifySignalData = propertyInfo[2];
+        // initialize property cache with current value
+        // NOTE: if this is an object, it is not directly unwrapped as it might
+        // reference other QObject that we do not know yet
+        object.__propertyCache__[propertyIndex] = propertyInfo[3];
+
+        if (notifySignalData) {
+            if (notifySignalData[0] === 1) {
+                // signal name is optimized away, reconstruct the actual name
+                notifySignalData[0] = propertyName + "Changed";
+            }
+            addSignal(notifySignalData, true);
+        }
+
+        Object.defineProperty(object, propertyName, {
+            configurable: true,
+            get: function () {
+                var propertyValue = object.__propertyCache__[propertyIndex];
+                if (propertyValue === undefined) {
+                    // This shouldn't happen
+                    console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
+                }
+
+                return propertyValue;
+            },
+            set: function(value) {
+                if (value === undefined) {
+                    console.warn("Property setter for " + propertyName + " called with undefined value!");
+                    return;
+                }
+                object.__propertyCache__[propertyIndex] = value;
+                webChannel.exec({
+                    "type": QWebChannelMessageTypes.setProperty,
+                    "object": object.__id__,
+                    "property": propertyIndex,
+                    "value": value
+                });
+            }
+        });
+
+    }
+
+    // ----------------------------------------------------------------------
+
+    data.methods.forEach(addMethod);
+
+    data.properties.forEach(bindGetterSetter);
+
+    data.signals.forEach(function(signal) { addSignal(signal, false); });
+
+    for (var name in data.enums) {
+        object[name] = data.enums[name];
+    }
+}
+
+//required for use with nodejs
+if (typeof module === 'object') {
+    module.exports = {
+        QWebChannel: QWebChannel
+    };
+}
+
+
+
+// provider.js
+/******************************************************************************
+Mozilla Public License Version 2.0
+==================================
+
+### 1. Definitions
+
+**1.1. “Contributor”**
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+**1.2. “Contributor Version”**
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+**1.3. “Contribution”**
+    means Covered Software of a particular Contributor.
+
+**1.4. “Covered Software”**
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+**1.5. “Incompatible With Secondary Licenses”**
+    means
+
+* **(a)** that the initial Contributor has attached the notice described
+    in Exhibit B to the Covered Software; or
+* **(b)** that the Covered Software was made available under the terms of
+    version 1.1 or earlier of the License, but not also under the
+    terms of a Secondary License.
+
+**1.6. “Executable Form”**
+    means any form of the work other than Source Code Form.
+
+**1.7. “Larger Work”**
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+**1.8. “License”**
+    means this document.
+
+**1.9. “Licensable”**
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+**1.10. “Modifications”**
+    means any of the following:
+
+* **(a)** any file in Source Code Form that results from an addition to,
+    deletion from, or modification of the contents of Covered
+    Software; or
+* **(b)** any new file in Source Code Form that contains any Covered
+    Software.
+
+**1.11. “Patent Claims” of a Contributor**
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+**1.12. “Secondary License”**
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+**1.13. “Source Code Form”**
+    means the form of the work preferred for making modifications.
+
+**1.14. “You” (or “Your”)**
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, “You” includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, “control” means **(a)** the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or **(b)** ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+
+### 2. License Grants and Conditions
+
+#### 2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+* **(a)** under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+* **(b)** under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+#### 2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+#### 2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+* **(a)** for any code that a Contributor has removed from Covered Software;
+    or
+* **(b)** for infringements caused by: **(i)** Your and any other third party's
+    modifications of Covered Software, or **(ii)** the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+* **(c)** under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+#### 2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+#### 2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+#### 2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+#### 2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+
+### 3. Responsibilities
+
+#### 3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+#### 3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+* **(a)** such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+* **(b)** You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+#### 3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+#### 3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+#### 3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+
+### 4. Inability to Comply Due to Statute or Regulation
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: **(a)** comply with
+the terms of this License to the maximum extent possible; and **(b)**
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+
+### 5. Termination
+
+**5.1.** The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated **(a)** provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and **(b)** on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+**5.2.** If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+**5.3.** In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+
+### 6. Disclaimer of Warranty
+
+> Covered Software is provided under this License on an “as is”
+> basis, without warranty of any kind, either expressed, implied, or
+> statutory, including, without limitation, warranties that the
+> Covered Software is free of defects, merchantable, fit for a
+> particular purpose or non-infringing. The entire risk as to the
+> quality and performance of the Covered Software is with You.
+> Should any Covered Software prove defective in any respect, You
+> (not any Contributor) assume the cost of any necessary servicing,
+> repair, or correction. This disclaimer of warranty constitutes an
+> essential part of this License. No use of any Covered Software is
+> authorized under this License except under this disclaimer.
+
+### 7. Limitation of Liability
+
+> Under no circumstances and under no legal theory, whether tort
+> (including negligence), contract, or otherwise, shall any
+> Contributor, or anyone who distributes Covered Software as
+> permitted above, be liable to You for any direct, indirect,
+> special, incidental, or consequential damages of any character
+> including, without limitation, damages for lost profits, loss of
+> goodwill, work stoppage, computer failure or malfunction, or any
+> and all other commercial damages or losses, even if such party
+> shall have been informed of the possibility of such damages. This
+> limitation of liability shall not apply to liability for death or
+> personal injury resulting from such party's negligence to the
+> extent applicable law prohibits such limitation. Some
+> jurisdictions do not allow the exclusion or limitation of
+> incidental or consequential damages, so this exclusion and
+> limitation may not apply to You.
+
+
+### 8. Litigation
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+
+### 9. Miscellaneous
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+
+### 10. Versions of the License
+
+#### 10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+#### 10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+#### 10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+#### 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+## Exhibit A - Source Code Form License Notice
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+## Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+    This Source Code Form is "Incompatible With Secondary Licenses", as
+    defined by the Mozilla Public License, v. 2.0.
+
+ */
+
 (function(){
   // Based on
   // https://github.com/status-im/status-react/blob/f9fb4d6974138a276b0cdcc6e4ea1611063e70ca/resources/js/provider.js