49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
const cds = require ('@sap/cds')
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const {resolve} = require ('path')
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const {promisify} = require('util')
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const readFile = promisify(require('fs').readFile)
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const swaggerUi = require ('swagger-ui-express')
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const DEBUG = cds.debug('openapi')
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let app, host, docCache={}
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cds
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.on ('bootstrap', _app => { app = _app })
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.on ('serving', service => {
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const apiPath = '/api-docs'+service.path
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console.log (`[Open API] - serving ${service.name} at ${apiPath}`)
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app.use(apiPath, async (req, _, next) => {
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req.swaggerDoc = await toOpenApiDoc(service, host, docCache)
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next()
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}, swaggerUi.serve, swaggerUi.setup())
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})
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.on ('listening', ({server})=> { host = 'localhost:'+server.address().port })
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async function toOpenApiDoc(service, host, cache) {
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if (!cache[service.name]) {
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const spec = await openApiFromFile(service)
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if (spec) {
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cache[service.name] = spec
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}
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else if (cds.compile.to.openapi) { // on-the-fly exporter available?
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DEBUG && DEBUG ('Compiling Open API spec for', service.name)
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cache[service.name] = cds.compile.to.openapi (service.model, {
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service: service.name,
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scheme: 'http', host, basePath: service.path
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})
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}
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}
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return cache[service.name]
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}
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async function openApiFromFile(service) {
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const fileName = resolve(`srv/${service.name}.openapi3.json`)
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const file = await readFile(fileName).catch(()=>{/*no such file*/})
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if (file) {
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DEBUG && DEBUG ('Using Open API spec from file', fileName)
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return JSON.parse(file)
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}
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}
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module.exports = cds.server
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