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| 1 | +/** |
| 2 | + * Copyright (c) 2020 DigiByte Foundation NZ Limited |
| 3 | + * |
| 4 | + * Permission is hereby granted, free of charge, to any person obtaining a copy of |
| 5 | + * this software and associated documentation files (the "Software"), to deal in |
| 6 | + * the Software without restriction, including without limitation the rights to |
| 7 | + * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
| 8 | + * the Software, and to permit persons to whom the Software is furnished to do so, |
| 9 | + * subject to the following conditions: |
| 10 | + * |
| 11 | + * The above copyright notice and this permission notice shall be included in all |
| 12 | + * copies or substantial portions of the Software. |
| 13 | + * |
| 14 | + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 15 | + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
| 16 | + * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
| 17 | + * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| 18 | + * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| 19 | + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 20 | + */ |
| 21 | + |
| 22 | +/* |
| 23 | + CallHandler calls registered service handlers (if existing). |
| 24 | + Must be called with .bind(expressApp) |
| 25 | +*/ |
| 26 | + |
| 27 | +const CallAsserter = async function (asserter, className, params) { |
| 28 | + if (!asserter || !className || !params) return; |
| 29 | + |
| 30 | + const validationFunc = asserter[className]; |
| 31 | + if (!validationFunc) { |
| 32 | + console.log(`No validation func ${className} found`); |
| 33 | + return; |
| 34 | + } |
| 35 | + |
| 36 | + return validationFunc.bind(asserter)(params); |
| 37 | +} |
| 38 | + |
| 39 | +const CallHandler = async function (route, args) { |
| 40 | + const app = this; |
| 41 | + const routeHandlers = app.routeHandlers; |
| 42 | + |
| 43 | + const data = routeHandlers[route]; |
| 44 | + if (!data || !data.handler) { |
| 45 | + throw new Error(`Service for ${route} not implemented`); |
| 46 | + } |
| 47 | + |
| 48 | + // Each route can have a specific asserter. |
| 49 | + // If a specific asserter was not set, the global asserter will |
| 50 | + // be used to validate requests, if set. |
| 51 | + const asserter = data.asserter || app.asserter; |
| 52 | + |
| 53 | + // Retrieve the modelName that was set by the Controller (collectRequestParams). |
| 54 | + // Also retrieve the request POST args using the modelName. |
| 55 | + const modelName = args.params.class; |
| 56 | + const requestParamsKey = args.params.requestParamsKey; |
| 57 | + const requestParams = args.params[requestParamsKey]; |
| 58 | + |
| 59 | + // Try to call the asserter. |
| 60 | + await CallAsserter(asserter, modelName, requestParams); |
| 61 | + |
| 62 | + return await data.handler(args); |
| 63 | +}; |
| 64 | + |
| 65 | +module.exports = CallHandler; |
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