+ [Add] Adding Config structure to the project

+ [Add] Adding Constant structure to the project

config/common.js

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+module.exports = {
+  node_env: process.env.NODE_ENV,
+};

config/database.js

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+const {node_env} = require("./common");
+const database = process.env.DATABASE;
+
+const options = {
+  useCreateIndex: true,
+  useNewUrlParser: true,
+  useFindAndModify: true,
+  useUnifiedTopology: true,
+};
+
+const mongodbConfig = node_env === "test" ?
+  {
+    database: process.env.MONGODB_TEST_DATABASE_NAME,
+    host: process.env.MONGODB_TEST_DATABASE_HOST,
+    username: process.env.MONGODB_TEST_DATABASE_USER,
+    password: process.env.MONGODB_TEST_DATABASE_PASS,
+    dialect: "mongodb",
+    options,
+  }:
+  {
+    database: process.env.MONGODB_DATABASE_NAME,
+    host: process.env.MONGODB_DATABASE_HOST,
+    username: process.env.MONGODB_DATABASE_USER,
+    password: process.env.MONGODB_DATABASE_PASS,
+    dialect: "mongodb",
+    options,
+  };
+
+const postgresqlConfig = node_env === "test" ? 
+  {
+    database: process.env.POSTGRESQL_TEST_DATABASE_NAME,
+    host: process.env.POSTGRESQL_TEST_DATABASE_HOST,
+    username: process.env.POSTGRESQL_TEST_DATABASE_USER,
+    password: process.env.POSTGRESQL_TEST_DATABASE_PASS,
+    dialect: "postgres",
+    options:{}
+  }:
+  {
+    database: process.env.POSTGRESQL_DATABASE_NAME,
+    host: process.env.POSTGRESQL_DATABASE_HOST,
+    username: process.env.POSTGRESQL_DATABASE_USER,
+    password: process.env.POSTGRESQL_DATABASE_PASS,
+    dialect: "postgres",
+    options:{}
+  };
+
+module.exports = {
+
+  database,
+  config:database==="POSTGRESQL"?postgresqlConfig:mongodbConfig
+
+};

config/index.js

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+module.exports = {
+  database: require("./database"),
+  common: require("./common"),
+  request: require("./request")
+};

config/request.js

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+exports.messenger = {
+  config: {
+    baseURL: "https://graph.facebook.com/v7.0",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    responseType: "json",
+  },
+  access_token: process.env.MESSENGER_BOT_ACCESS_TOKEN,
+};
+
+exports.weather = {
+  config: {
+    baseURL: "https://api.weatherapi.com/v1",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    responseType: "json",
+  },
+  api_key: process.env.WEATHER_SERVICE_API_KEY,
+};

constants/bot.js

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+exports.VERIFICATION_TOKEN = process.env.MESSENGER_BOT_VERIFICATION_TOKEN;
+exports.ACESS_TOKEN = process.env.MESSENGER_BOT_ACESS_TOKEN;

constants/cache_keys.js

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+module.exports = {
+  MESSAGE:"MESSAGE",
+  USER:"USER",
+};

constants/http_codes.js

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+/**
+ * Informational
+ */
+exports.HTTP_CONTINUE = 100;
+exports.HTTP_SWITCHING_PROTOCOLS = 101;
+exports.HTTP_PROCESSING = 102; // RFC2518
+
+/**
+ * Success
+ */
+exports.HTTP_OK = 200;
+exports.HTTP_CREATED = 201;
+exports.HTTP_ACCEPTED = 202;
+exports.HTTP_NON_AUTHORITATIVE_INFORMATION = 203;
+exports.HTTP_NO_CONTENT = 204;
+exports.HTTP_RESET_CONTENT = 205;
+exports.HTTP_PARTIAL_CONTENT = 206;
+exports.HTTP_MULTI_STATUS = 207; // RFC4918
+exports.HTTP_ALREADY_REPORTED = 208; // RFC5842
+exports.HTTP_IM_USED = 226; // RFC3229
+
+/**
+ * Redirection
+ */
+exports.HTTP_MULTIPLE_CHOICES = 300;
+exports.HTTP_MOVED_PERMANENTLY = 301;
+exports.HTTP_FOUND = 302;
+exports.HTTP_SEE_OTHER = 303;
+exports.HTTP_NOT_MODIFIED = 304;
+exports.HTTP_USE_PROXY = 305;
+exports.HTTP_RESERVED = 306;
+exports.HTTP_TEMPORARY_REDIRECT = 307;
+exports.HTTP_PERMANENTLY_REDIRECT = 308; // RFC7238
+
+/**
+ * Client Error
+ */
+exports.HTTP_BAD_REQUEST = 400;
+exports.HTTP_UNAUTHORIZED = 401;
+exports.HTTP_PAYMENT_REQUIRED = 402;
+exports.HTTP_FORBIDDEN = 403;
+/**
+ * The requested resource could not be found
+ *
+ * Note: This is sometimes used to mask if there was an UNAUTHORIZED (401) or
+ * FORBIDDEN (403) error, for security reasons
+ */
+exports.HTTP_NOT_FOUND = 404;
+exports.HTTP_METHOD_NOT_ALLOWED = 405;
+exports.HTTP_NOT_ACCEPTABLE = 406;
+exports.HTTP_PROXY_AUTHENTICATION_REQUIRED = 407;
+exports.HTTP_REQUEST_TIMEOUT = 408;
+exports.HTTP_CONFLICT = 409;
+exports.HTTP_GONE = 410;
+exports.HTTP_LENGTH_REQUIRED = 411;
+exports.HTTP_PRECONDITION_FAILED = 412;
+exports.HTTP_REQUEST_ENTITY_TOO_LARGE = 413;
+exports.HTTP_REQUEST_URI_TOO_LONG = 414;
+exports.HTTP_UNSUPPORTED_MEDIA_TYPE = 415;
+exports.HTTP_REQUESTED_RANGE_NOT_SATISFIABLE = 416;
+exports.HTTP_EXPECTATION_FAILED = 417;
+exports.HTTP_I_AM_A_TEAPOT = 418; // RFC2324
+exports.HTTP_UNPROCESSABLE_ENTITY = 422; // RFC4918
+exports.HTTP_LOCKED = 423; // RFC4918
+exports.HTTP_FAILED_DEPENDENCY = 424; // RFC4918
+exports.HTTP_RESERVED_FOR_WEBDAV_ADVANCED_COLLECTIONS_EXPIRED_PROPOSAL = 425; // RFC2817
+exports.HTTP_UPGRADE_REQUIRED = 426; // RFC2817
+exports.HTTP_PRECONDITION_REQUIRED = 428; // RFC6585
+exports.HTTP_TOO_MANY_REQUESTS = 429; // RFC6585
+exports.HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431; // RFC6585
+
+/**
+ * The server encountered an unexpected error
+ */
+exports.HTTP_INTERNAL_SERVER_ERROR = 500;
+exports.HTTP_NOT_IMPLEMENTED = 501;
+exports.HTTP_BAD_GATEWAY = 502;
+exports.HTTP_SERVICE_UNAVAILABLE = 503;
+exports.HTTP_GATEWAY_TIMEOUT = 504;
+exports.HTTP_VERSION_NOT_SUPPORTED = 505;
+exports.HTTP_VARIANT_ALSO_NEGOTIATES_EXPERIMENTAL = 506; // RFC2295
+exports.HTTP_INSUFFICIENT_STORAGE = 507; // RFC4918
+exports.HTTP_LOOP_DETECTED = 508; // RFC5842
+exports.HTTP_NOT_EXTENDED = 510; // RFC2774
+exports.HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511;

constants/index.js

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+module.exports = {
+  HTTP_CODES: require("./http_codes"),
+  BOT: require("./bot"),
+  CACHE_KEYS: require("./cache_keys"),
+};