Allow ending polls (#7305)

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/dialogs/EndPollDialog.tsx

@@ -0,0 +1,103 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+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 React from "react";
+import { MatrixEvent } from "matrix-js-sdk/src/models/event";
+import { MatrixClient } from "matrix-js-sdk/src/client";
+import { Relations } from "matrix-js-sdk/src/models/relations";
+
+import { _t } from "../../../languageHandler";
+import { IDialogProps } from "./IDialogProps";
+import QuestionDialog from "./QuestionDialog";
+import { IPollEndContent, POLL_END_EVENT_TYPE, TEXT_NODE_TYPE } from "../../../polls/consts";
+import { findTopAnswer } from "../messages/MPollBody";
+import Modal from "../../../Modal";
+import ErrorDialog from "./ErrorDialog";
+
+interface IProps extends IDialogProps {
+    matrixClient: MatrixClient;
+    event: MatrixEvent;
+    onFinished: (success: boolean) => void;
+    getRelationsForEvent?: (
+        eventId: string,
+        relationType: string,
+        eventType: string
+    ) => Relations;
+}
+
+export default class EndPollDialog extends React.Component<IProps> {
+    private onFinished = (endPoll: boolean) => {
+        const topAnswer = findTopAnswer(
+            this.props.event,
+            this.props.matrixClient,
+            this.props.getRelationsForEvent,
+        );
+
+        const message = (
+            (topAnswer === "")
+                ? _t("The poll has ended. No votes were cast.")
+                : _t(
+                    "The poll has ended. Top answer: %(topAnswer)s",
+                    { topAnswer },
+                )
+        );
+
+        if (endPoll) {
+            const endContent: IPollEndContent = {
+                [POLL_END_EVENT_TYPE.name]: {},
+                "m.relates_to": {
+                    "event_id": this.props.event.getId(),
+                    "rel_type": "m.reference",
+                },
+                [TEXT_NODE_TYPE.name]: message,
+            };
+
+            this.props.matrixClient.sendEvent(
+                this.props.event.getRoomId(), POLL_END_EVENT_TYPE.name, endContent,
+            ).catch((e: any) => {
+                console.error("Failed to submit poll response event:", e);
+                Modal.createTrackedDialog(
+                    'Failed to end poll',
+                    '',
+                    ErrorDialog,
+                    {
+                        title: _t("Failed to end poll"),
+                        description: _t(
+                            "Sorry, the poll did not end. Please try again."),
+                    },
+                );
+            });
+        }
+        this.props.onFinished(endPoll);
+    };
+
+    render() {
+        return (
+            <QuestionDialog
+                title={_t("End Poll")}
+                description={
+                    _t(
+                        "Are you sure you want to end this poll? " +
+                        "This will show the final results of the poll and " +
+                        "stop people from being able to vote.",
+                    )
+                }
+                button={_t("End Poll")}
+                onFinished={(endPoll: boolean) => this.onFinished(endPoll)}
+            />
+        );
+    }
+}