55 lines
1.4 KiB
JavaScript
55 lines
1.4 KiB
JavaScript
'use strict'
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const stream = require('stream')
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const log = require('./log')
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const svg2img = require('./svg-to-img')
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function streamFromString(str) {
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const newStream = new stream.Readable()
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newStream._read = () => {
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newStream.push(str)
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newStream.push(null)
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}
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return newStream
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}
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function makeSend(format, askres, end) {
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if (format === 'svg') {
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return res => sendSVG(res, askres, end)
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} else if (format === 'json') {
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return res => sendJSON(res, askres, end)
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} else {
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return res => sendOther(format, res, askres, end)
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}
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}
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function sendSVG(res, askres, end) {
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askres.setHeader('Content-Type', 'image/svg+xml;charset=utf-8')
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end(null, { template: streamFromString(res) })
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}
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function sendOther(format, res, askres, end) {
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askres.setHeader('Content-Type', `image/${format}`)
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svg2img(res, format)
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// This interacts with callback code and can't use async/await.
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// eslint-disable-next-line promise/prefer-await-to-then
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.then(data => {
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end(null, { template: streamFromString(data) })
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})
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.catch(err => {
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// This emits status code 200, though 500 would be preferable.
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log.error('svg2img error', err)
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end(null, { template: '500.html' })
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})
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}
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function sendJSON(res, askres, end) {
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askres.setHeader('Content-Type', 'application/json')
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askres.setHeader('Access-Control-Allow-Origin', '*')
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end(null, { template: streamFromString(res) })
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}
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module.exports = {
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makeSend,
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}
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