Pull out multi-inviting from MultiInviteDialog

MultiInviteDialog would otherwise use this, but is about to go away, so it has been left.

src/Invite.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import MatrixClientPeg from './MatrixClientPeg';
+import MultiInviter from '../../../utils/MultiInviter';
 
 const emailRegex = /^\S+@\S+\.\S+$/;
 
@@ -43,3 +44,17 @@ export function inviteToRoom(roomId, addr) {
         throw new Error('Unsupported address');
     }
 }
+
+/**
+ * Invites multiple addresses to a room
+ * Simpler interface to utils/MultiInviter but with
+ * no option to cancel.
+ *
+ * @param {roomId} The ID of the room to invite to
+ * @param {array} Array of strings of addresses to invite. May be matrix IDs or 3pids.
+ * @returns Promise
+ */
+export function inviteMultipleToRoom(roomId, addrs) {
+    this.inviter = new MultiInviter(roomId);
+    return inviter.invite(addrs);
+}

src/utils/MultiInviter.js

@@ -0,0 +1,144 @@
+/*
+Copyright 2016 OpenMarket 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 {getAddressType, inviteToRoom} from '../Invite';
+import q from 'q';
+
+/**
+ * Invites multiple addresses to a room, handling rate limiting from the server
+ */
+export default class MultiInviter {
+    constructor(roomId) {
+        this.roomId = roomId;
+
+        this.canceled = false;
+        this.addrs = [];
+        this.busy = false;
+        this.completionStates = {}; // State of each address (invited or error)
+        this.errorTexts = {}; // Textual error per address
+        this.deferred = null;
+    }
+
+    /**
+     * Invite users to this room. This may only be called once per
+     * instance of the class.
+     *
+     * The promise is given progress when each address completes, with an
+     * object argument with each completed address with value either
+     * 'invited' or 'error'.
+     *
+     * @param {array} addresses Array of addresses to invite
+     * @returns {Promise} Resolved when all invitations in the queue are complete
+     */
+    invite(addrs) {
+        if (this.addrs.length > 0) {
+            throw new Error("Already inviting/invited");
+        }
+        this.addrs.push(...addrs);
+
+        for (const addr of this.addrs) {
+            if (getAddressType(addr) === null) {
+                this.completionStates[addr] = 'error';
+                this.errorTexts[addr] = 'Unrecognised address';
+            }
+        }
+        this.deferred = q.defer();
+        this._inviteMore(0);
+
+        return this.deferred.promise;
+    }
+
+    /**
+     * Stops inviting. Causes promises returned by invite() to be rejected.
+     */
+    cancel() {
+        if (!this.busy) return;
+
+        this._canceled = true;
+        this.deferred.reject(new Error('canceled'));
+    }
+
+    getCompletionState(addr) {
+        return this.completionStates[addr];
+    }
+
+    getErrorText(addr) {
+        return this.errorTexts[addr];
+    }
+
+    _inviteMore(nextIndex) {
+        if (this._canceled) {
+            return;
+        }
+
+        if (nextIndex == this.addrs.length) {
+            this.busy = false;
+            this.deferred.resolve(this.completionStates);
+            return;
+        }
+
+        const addr = this.addrs[nextIndex];
+
+        // don't try to invite it if it's an invalid address
+        // (it will already be marked as an error though,
+        // so no need to do so again)
+        if (getAddressType(addr) === null) {
+            this._inviteMore(nextIndex + 1);
+            return;
+        }
+
+        // don't re-invite (there's no way in the UI to do this, but
+        // for sanity's sake)
+        if (this.completionStates[addr] == 'invited') {
+            this._inviteMore(nextIndex + 1);
+            return;
+        }
+
+        inviteToRoom(this.roomId, addr).then(() => {
+            if (this._canceled) { return; }
+
+            this.completionStates[addr] = 'invited';
+            this.deferred.notify(this.completionStates);
+
+            this._inviteMore(nextIndex + 1);
+        }, (err) => {
+            if (this._canceled) { return; }
+
+            let errorText;
+            let fatal = false;
+            if (err.errcode == 'M_FORBIDDEN') {
+                fatal = true;
+                errorText = 'You do not have permission to invite people to this room.';
+            } else if (err.errcode == 'M_LIMIT_EXCEEDED') {
+                // we're being throttled so wait a bit & try again
+                setTimeout(() => {
+                    this._inviteMore(nextIndex);
+                }, 5000);
+                return;
+            } else {
+                errorText = 'Unknown server error';
+            }
+            this.completionStates[addr] = 'error';
+            this.errorTexts[addr] = errorText;
+            this.busy = !fatal;
+
+            if (!fatal) {
+                this.deferred.notify(this.completionStates);
+                this._inviteMore(nextIndex + 1);
+            }
+        });
+    }
+}