1 | const events = require('./config/events');
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2 | const Context = require('./interfaces/context');
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3 |
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4 | const { NotImplementedError } = require('./exceptions');
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5 |
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6 | class VkBotSdkCallback {
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7 | |
8 |
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9 |
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10 |
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11 |
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12 | constructor(client) {
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13 | this.client = client;
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14 |
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15 | this.middlewaresHandlers = [];
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16 | this.eventsHandlers = [];
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17 | this.messagesHandlers = [];
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18 | this.errorsHandlers = [];
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19 |
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20 | this.longpoll = {
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21 | key: '',
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22 | server: '',
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23 | ts: 0
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24 | };
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25 |
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26 | this.eventsCallback = this.eventsCallback.bind(this);
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27 | }
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28 |
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29 | |
30 |
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31 |
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32 |
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33 | use(cb) {
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34 | this.middlewaresHandlers.push({ cb: cb });
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35 | }
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36 |
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37 | |
38 |
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39 |
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40 |
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41 | onError(cb) {
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42 | this.errorsHandlers.push({ cb: cb });
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43 | }
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44 |
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45 | |
46 |
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47 |
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48 |
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49 |
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50 |
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51 | on(e, cb) {
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52 | this.eventsHandlers.push({ event: e, cb: cb });
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53 | }
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54 |
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55 | |
56 |
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57 |
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58 |
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59 |
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60 |
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61 | payload(act, cb) {
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62 | this.messagesHandlers.push({
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63 | type: 'payload',
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64 | actions: Array.isArray(act) ? act : [act],
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65 | cb: cb
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66 | });
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67 | }
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68 |
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69 | |
70 |
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71 |
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72 |
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73 |
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74 |
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75 | command(exp, cb) {
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76 | this.messagesHandlers.push({
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77 | type: 'command',
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78 | expressions: Array.isArray(exp) ? exp : [exp],
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79 | cb: cb
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80 | });
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81 | }
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82 |
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83 | |
84 |
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85 |
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86 |
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87 | defaultReply(cb) {
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88 | this.messagesHandlers.push({ type: 'command', expressions: [], cb: cb });
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89 | }
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90 |
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91 | |
92 |
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93 |
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94 | initLongPoll() {
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95 | const options = this.client.options;
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96 |
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97 | if(!options.group_id) {
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98 | throw new NotImplementedError('options.group_id is required for longpoll');
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99 | }
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100 |
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101 | this.request('groups.getLongPollServer', {
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102 | group_id: options.group_id
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103 | }).then(async (data) => {
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104 | this.longpoll.key = data.key;
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105 | this.longpoll.server = data.server;
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106 | this.longpoll.ts = data.ts;
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107 |
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108 | await this.requestLongPoll();
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109 | });
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110 | }
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111 |
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112 | |
113 |
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114 |
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115 | async requestLongPoll() {
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116 | const request = await this.client.get(this.longpoll.server, {
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117 | act: 'a_check',
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118 | key: this.longpoll.key,
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119 | ts: this.longpoll.ts,
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120 | wait: 25
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121 | });
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122 |
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123 | if('failed' in request) {
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124 | setTimeout(() => this.initLongPoll(), 1000);
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125 | return;
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126 | }
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127 |
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128 | this.longpoll.ts = request.ts;
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129 |
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130 | for(let event of request['updates']) {
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131 | this.handleEvent(event).then();
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132 | }
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133 |
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134 | setTimeout(() => this.requestLongPoll(), 1);
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135 | }
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136 |
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137 |
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138 | |
139 |
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140 |
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141 |
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142 |
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143 |
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144 | async eventsCallback(req, res) {
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145 | |
146 |
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147 |
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148 | const data = req.body;
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149 | const options = this.client.options;
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150 |
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151 | if(!('type' in data) || !('object' in data)) {
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152 | return req.send('ok');
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153 | }
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154 | else if(options.secret && data.secret !== options.secret) {
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155 | return res.send('Invalid secret');
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156 | }
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157 | else if(data.type === events.confirmation) {
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158 | return res.send(this.client.options.confirmation);
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159 | }
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160 | else res.send('ok');
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161 |
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162 | await this.handleEvent(data);
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163 | }
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164 |
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165 |
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166 | |
167 |
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168 |
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169 |
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170 |
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171 | async handleEvent(data) {
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172 | const middlewaresHandlers = [...this.middlewaresHandlers];
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173 | const eventsHandlers = [...this.eventsHandlers];
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174 | const messagesHandlers = [...this.messagesHandlers];
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175 | const errorsHandlers = [...this.errorsHandlers];
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176 |
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177 | const ctx = new Context(this.client, data);
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178 |
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179 | const handleCallback = async (task, parameter = null) => {
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180 | try {
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181 | let result;
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182 |
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183 | if(parameter instanceof Error) result = task.cb(parameter, ctx, handleNextTask);
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184 | else if(parameter !== null) result = task.cb(ctx, parameter, handleNextTask);
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185 | else result = task.cb(ctx, handleNextTask);
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186 |
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187 | if(result instanceof Promise) return await result;
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188 | else return result;
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189 | }
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190 | catch (e) {
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191 | handleNextTask(e, ctx, handleNextTask);
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192 | }
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193 |
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194 | return null;
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195 | };
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196 | const handleNextTask = (err = null) => {
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197 | if(err instanceof Error) {
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198 | if(errorsHandlers.length > 0) {
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199 | const handler = errorsHandlers.splice(0, 1)[0];
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200 | return handleCallback(handler, err);
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201 | }
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202 | }
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203 | else {
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204 | if(middlewaresHandlers.length > 0) {
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205 | const middleware = middlewaresHandlers.splice(0, 1)[0];
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206 | return handleCallback(middleware);
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207 | }
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208 | else if(eventsHandlers.length > 0) {
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209 | const event = eventsHandlers.splice(0, 1)[0];
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210 | if(event.event === data.type) return handleCallback(event);
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211 |
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212 | return handleNextTask();
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213 | }
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214 | else if(messagesHandlers.length > 0) {
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215 | const handler = messagesHandlers.splice(0, 1)[0];
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216 |
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217 | if(handler.type === 'payload') {
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218 | const result = this._checkCommandPayloads(ctx, handler);
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219 | if (result !== false) return handleCallback(handler, result);
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220 | }
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221 | else if (handler.type === 'command') {
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222 | const result = this._checkCommandExpressions(ctx, handler);
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223 | if (result !== false) return handleCallback(handler, result);
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224 | }
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225 |
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226 | return handleNextTask();
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227 | }
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228 | }
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229 | };
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230 |
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231 | handleNextTask();
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232 | }
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233 |
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234 | |
235 |
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236 |
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237 |
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238 |
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239 |
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240 |
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241 |
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242 | _checkCommandPayloads(ctx, task) {
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243 | if(ctx.payload.length === 0) return false;
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244 |
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245 | for (let action of task.actions) {
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246 | if(ctx.payload[0] === action) return ctx.payload[1];
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247 | }
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248 |
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249 | return false;
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250 | }
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251 |
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252 | |
253 |
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254 |
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255 |
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256 |
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257 |
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258 |
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259 |
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260 | _checkCommandExpressions(ctx, task) {
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261 | if(task.expressions.length === 0) return true;
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262 |
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263 | for (let expression of task.expressions) {
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264 | if(typeof expression === 'string' && ctx.message === expression) return expression;
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265 | else if(expression instanceof RegExp) {
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266 | const result = expression.exec(ctx.message);
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267 | if (result) return result.slice(1);
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268 | }
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269 | }
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270 |
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271 | return false;
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272 | }
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273 |
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274 | |
275 |
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276 |
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277 |
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278 |
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279 |
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280 | request(method, params) {
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281 | return this.client.request(method, params);
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282 | }
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283 |
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284 | |
285 |
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286 |
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287 |
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288 |
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289 |
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290 |
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291 |
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292 | uploadFile(url, file, key, filename) {
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293 | return this.client.uploadFile(url, file, key, filename);
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294 | }
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295 | }
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296 |
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297 | module.exports = VkBotSdkCallback; |
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