1 | import express from "express";
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2 | import bodyParser from "body-parser";
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3 | import cookieParser from "cookie-parser";
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4 | import {get, isNil, set, defaultsDeep, each, castArray, has, isNaN} from "lodash";
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5 | import {APIConfig} from "./lib/APIConfig";
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6 | import path from "path";
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7 | import {APIUtils} from "./lib/APIUtils";
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8 | import "reflect-metadata";
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9 | import {APIResponse} from "./lib/APIResponse";
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10 | import {APIError} from "./lib/APIError";
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11 | import {KVService} from "./lib/Services/KeyValue/KVService";
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12 | import {FileService} from "./lib/Services/File/FileService";
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13 | import {EnvVarSync} from "./lib/Services/Config";
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14 | import {APIAuthUser, APIAuthUtils} from "./lib/APIAuthUtils";
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15 |
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16 | interface HandlerParameterData {
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17 | paramRawType: string;
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18 | paramType: string;
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19 | paramName: string;
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20 | paramOptions: APIParameterOptions;
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21 | }
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22 |
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23 | interface HandlerData {
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24 | isInstance: boolean;
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25 | options: APIEndpointOptions;
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26 | handlerFunction: Function;
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27 | handlerParameterNames: string[];
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28 | handlerParameterData: { [paramIndex: number]: HandlerParameterData };
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29 | }
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30 |
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31 | export interface APILoaderDefinition {
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32 | apiPath?: string;
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33 | require: string;
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34 | moduleName?: string;
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35 | }
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36 |
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37 | export interface APILoveOptions {
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38 |
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39 |
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40 | apis?: APILoaderDefinition[];
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41 |
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42 |
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43 | loadStandardMiddleware?: boolean;
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44 |
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45 |
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46 | middleware?: any[];
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47 |
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48 |
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49 | defaultErrorHandler?: (error, req, res, next) => void;
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50 |
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51 |
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52 | defaultRouteHandler?: (req, res) => void;
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53 |
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54 | callbackWaitsForEmptyEventLoop?: boolean;
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55 | }
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56 |
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57 | function _createHandlerWrapperFunction(handlerData: HandlerData, thisObject) {
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58 | return (req, res, next) => {
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59 |
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60 | let apiResponse = new APIResponse(req, res, next);
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61 |
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62 |
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63 | if (handlerData.options.requireAuthentication) {
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64 | if (!req.auth || !req.auth.isAuthenticated || req.auth.isExpired) {
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65 | apiResponse.withError(APIError.create401UnauthorizedError());
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66 | return;
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67 | }
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68 | }
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69 |
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70 | let handlerArgs = [];
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71 | let validationErrors: { parameter: string, message: string }[] = [];
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72 |
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73 |
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74 | for (let index = 0; index < handlerData.handlerParameterNames.length; index++) {
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75 | let paramData: HandlerParameterData = handlerData.handlerParameterData[index];
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76 | let paramOptions: APIParameterOptions = get(paramData, "paramOptions", {});
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77 | let paramName = APIUtils.coalesce(paramOptions.rawName, handlerData.handlerParameterNames[index]);
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78 |
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79 |
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80 | if ((index === handlerData.handlerParameterNames.length - 1 || index === handlerData.handlerParameterNames.length - 2) && ["req", "request", "res", "response"].indexOf(paramName.toLowerCase()) >= 0) {
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81 | continue;
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82 | }
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83 |
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84 | let paramSources: string[] = castArray(get(paramOptions, "sources", ["params", "query", "body", "cookie", "headers"]));
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85 | let paramValue;
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86 |
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87 | if (req.auth && paramData.paramType === "APIAuthUser") {
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88 | paramValue = APIAuthUtils.getAPIAuthUserFromAuthCredentials(req.auth);
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89 | } else {
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90 | for (let paramSource of paramSources) {
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91 | let paramValues = get(req, paramSource);
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92 |
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93 | if (isNil(paramValues)) {
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94 | continue;
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95 | }
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96 |
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97 | if (paramOptions.includeFullSource ||
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98 | (/[\.\[\]]/g).test(paramSource)
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99 | ) {
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100 | paramValue = paramValues;
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101 | break;
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102 | } else {
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103 | if (has(paramValues, paramName)) {
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104 | paramValue = paramValues[paramName];
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105 | break;
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106 | }
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107 | }
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108 | }
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109 | }
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110 |
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111 | let argValue = APIUtils.coalesce(paramValue, paramOptions.defaultValue);
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112 |
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113 | if (paramOptions.processor) {
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114 | try {
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115 | argValue = paramOptions.processor(argValue, req);
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116 | } catch (error) {
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117 | validationErrors.push({
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118 | parameter: paramName,
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119 | message: error.message || error.toString()
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120 | });
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121 | continue;
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122 | }
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123 | }
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124 |
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125 | if (isNil(argValue)) {
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126 |
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127 |
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128 | if (!get(paramOptions, "optional", false)) {
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129 | validationErrors.push({
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130 | parameter: paramName,
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131 | message: "missing"
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132 | });
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133 | }
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134 |
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135 | handlerArgs.push(undefined);
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136 | continue;
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137 | }
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138 |
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139 | argValue = APIUtils.convertToType(argValue, paramData.paramRawType);
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140 |
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141 | if (isNil(argValue) || isNaN(argValue)) {
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142 | validationErrors.push({
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143 | parameter: paramName,
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144 | message: "invalid"
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145 | });
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146 | continue;
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147 | }
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148 |
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149 | handlerArgs.push(argValue);
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150 | }
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151 |
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152 | if (validationErrors.length > 0) {
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153 | apiResponse.withError(APIError.createValidationError(validationErrors));
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154 | return;
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155 | }
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156 |
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157 | apiResponse.processHandlerFunction(thisObject, handlerData.handlerFunction, handlerArgs, handlerData.options.disableFriendlyResponse, handlerData.options.successResponse);
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158 | };
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159 | }
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160 |
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161 | function _loadAPI(apiRouter, apiDefinition: APILoaderDefinition) {
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162 |
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163 | let apiModule;
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164 | try {
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165 | apiModule = require(path.resolve(process.cwd(), apiDefinition.require));
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166 | } catch (e) {
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167 | console.error(e);
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168 | return null;
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169 | }
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170 |
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171 | if (isNil(apiModule)) {
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172 | return null;
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173 | }
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174 |
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175 | let moduleName = APIUtils.coalesce(apiDefinition.moduleName, path.basename(apiDefinition.require));
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176 | let apiClass = APIUtils.coalesce(apiModule[moduleName], apiModule.default, apiModule);
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177 |
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178 | let apiInstance;
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179 |
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180 | each(get(apiClass, "__handlerData", {}), (handlerData: HandlerData, name) => {
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181 |
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182 |
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183 | if (handlerData.isInstance && isNil(apiInstance)) {
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184 | apiInstance = new apiClass();
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185 | }
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186 |
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187 | let options: APIEndpointOptions = handlerData.options;
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188 | let argsArray: any[] = [options.path];
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189 |
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190 |
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191 | if (options.middleware) {
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192 | argsArray = argsArray.concat(castArray(options.middleware));
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193 | }
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194 |
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195 | let handlerWrapper = _createHandlerWrapperFunction(handlerData, handlerData.isInstance ? apiInstance : apiClass);
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196 | argsArray.push(handlerWrapper);
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197 |
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198 | apiRouter[options.method.toLowerCase()].apply(apiRouter, argsArray);
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199 | });
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200 | }
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201 |
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202 | export class APILove {
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203 |
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204 | static app = express();
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205 |
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206 | static start(options: APILoveOptions) {
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207 |
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208 | if (options.loadStandardMiddleware !== false) {
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209 | this.app.use(cookieParser());
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210 | this.app.use(bodyParser.json({limit: "50mb"}));
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211 | this.app.use(bodyParser.urlencoded({limit: "50mb", extended: false, parameterLimit: 50000}));
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212 | this.app.use(bodyParser.text({limit: "50mb"}));
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213 | this.app.use((req, res, next) => {
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214 | req.auth = APIAuthUtils.getAuthCredentialsFromRequest(req, true);
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215 | next();
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216 | });
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217 | }
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218 |
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219 | for (let mw of get(options, "middleware", [])) {
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220 | this.app.use(mw);
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221 | }
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222 |
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223 |
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224 | for (let api of get(options, "apis", []) as APILoaderDefinition[]) {
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225 |
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226 | if (isNil(api.apiPath)) {
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227 | api.apiPath = "";
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228 | }
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229 |
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230 | if (APIConfig.LAZY_LOAD_APIS) {
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231 | let apiRouter;
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232 |
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233 | this.app.use(api.apiPath, (req, res, next) => {
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234 |
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235 |
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236 | if (!apiRouter) {
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237 | apiRouter = express.Router();
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238 | _loadAPI(apiRouter, api);
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239 | }
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240 |
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241 | apiRouter(req, res, next);
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242 | });
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243 | } else {
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244 | let apiRouter = express.Router();
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245 | _loadAPI(apiRouter, api);
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246 | this.app.use(api.apiPath, apiRouter);
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247 | }
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248 | }
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249 |
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250 | if (!isNil(options.defaultRouteHandler)) {
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251 | this.app.use(options.defaultRouteHandler);
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252 | }
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253 |
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254 |
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255 | if (!isNil(options.defaultErrorHandler)) {
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256 | this.app.use(options.defaultErrorHandler);
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257 | } else {
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258 | this.app.use((error, req, res, next) => {
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259 |
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260 | if (error instanceof APIError) {
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261 | let apiError = error as APIError;
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262 | res.status(apiError.statusCode).send(APIConfig.OUTPUT_HAPI_RESULTS ? apiError.hapiOut() : apiError.out());
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263 | } else {
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264 | let apiResponse = new APIResponse(res, res);
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265 | apiResponse.withError(error);
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266 | }
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267 |
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268 | });
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269 | }
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270 |
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271 |
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272 | if (APIConfig.RUN_AS_SERVER) {
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273 | this.app.listen(APIConfig.WEB_PORT, () => console.log(`API listening on port ${APIConfig.WEB_PORT}`));
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274 | return this.app;
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275 | } else {
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276 | let serverless = require("serverless-http");
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277 | return serverless(this.app, {callbackWaitsForEmptyEventLoop: !!options.callbackWaitsForEmptyEventLoop});
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278 | }
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279 | }
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280 | }
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281 |
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282 | export interface APIParameterOptions {
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283 |
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284 | |
285 |
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286 |
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287 | optional?: boolean;
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288 |
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289 | |
290 |
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291 |
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292 | defaultValue?: any;
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293 |
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294 | |
295 |
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296 |
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297 |
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298 | processor?: (value: any, req?) => any;
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299 |
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300 | |
301 |
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302 |
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303 |
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304 | sources?: string[] | string;
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305 |
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306 | |
307 |
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308 |
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309 |
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310 |
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311 |
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312 |
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313 |
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314 |
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315 |
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316 |
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317 |
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318 |
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319 | includeFullSource?: boolean;
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320 |
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321 | |
322 |
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323 |
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324 |
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325 | rawName?: string;
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326 | }
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327 |
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328 | export function APIParameter(options: APIParameterOptions) {
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329 | return function (target, key, parameterIndex: number) {
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330 | let isInstance = isNil(target.prototype);
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331 | let theClass = isInstance ? target.constructor : target.prototype.constructor;
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332 |
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333 | let handlerData: HandlerData = get(theClass, `__handlerData.${key}`, {});
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334 | set(handlerData, `handlerParameterData.${parameterIndex}.paramOptions`, options);
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335 | set(theClass, `__handlerData.${key}`, handlerData);
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336 | }
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337 | }
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338 |
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339 | export interface APIEndpointOptions {
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340 |
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341 | method?: string;
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342 |
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343 |
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344 | path?: string;
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345 |
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346 |
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347 | middleware?: ((req, res, next?) => void)[] | ((req, res, next) => void);
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348 |
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349 | // Turn this on if you want to return data as-is and not in HAPI format
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350 | disableFriendlyResponse?: boolean;
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351 |
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352 | // Specify a function here to handle the response yourself
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353 | successResponse?: (responseData: any, res) => void;
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354 |
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355 |
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356 | requireAuthentication?: boolean;
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357 | }
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358 |
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359 | export function APIEndpoint(options?: APIEndpointOptions) {
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360 | return function (target, key, descriptor) {
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361 |
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362 | let isInstance = isNil(target.prototype);
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363 | let theClass = isInstance ? target.constructor : target.prototype.constructor;
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364 |
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365 | let handlerData: HandlerData = get(theClass, `__handlerData.${key}`, {});
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366 |
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367 | options = defaultsDeep({}, options, {
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368 | method: "get",
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369 | path: "/"
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370 | });
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371 |
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372 | let parameterMetadata = Reflect.getMetadata("design:paramtypes", target, key);
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373 | let parameterNames = APIUtils.getFunctionParamNames(descriptor.value);
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374 |
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375 | handlerData.isInstance = isInstance;
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376 | handlerData.handlerFunction = descriptor.value;
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377 | handlerData.options = options;
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378 | handlerData.handlerParameterNames = parameterNames;
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379 |
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380 | for (let parameterIndex = 0; parameterIndex < parameterNames.length; parameterIndex++) {
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381 | set(handlerData, `handlerParameterData.${parameterIndex}.paramRawType`, APIUtils.getRawTypeName(parameterMetadata[parameterIndex].prototype));
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382 | set(handlerData, `handlerParameterData.${parameterIndex}.paramType`, parameterMetadata[parameterIndex].name);
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383 | set(handlerData, `handlerParameterData.${parameterIndex}.paramName`, parameterNames[parameterIndex]);
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384 | }
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385 |
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386 | set(theClass, `__handlerData.${key}`, handlerData);
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387 | }
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388 | }
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389 |
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390 |
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391 |
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392 | export {
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393 | APIConfig,
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394 | APIAuthUtils,
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395 | APIError,
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396 | APIResponse,
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397 | APIUtils,
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398 | KVService as APIKVService,
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399 | FileService as APIFileService,
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400 | EnvVarSync
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401 | }; |
\ | No newline at end of file |