test-pr-comment-delivery.js

#!/usr/bin/env node

(async () => {
    const fs = require('fs')

    // Expect a path as command-line parameter that points to a file containing
    // an event copy/pasted from
    // https://github.com/organizations/git-for-windows/settings/apps/gitforwindowshelper/advanced
    // in the form:
    //
    // Headers
    //
    // Request method: POST
    // [...]
    //
    // Payload
    //
    // {
    //    [...]
    // }

    const path = process.argv[2]
    const contents = fs.readFileSync(path).toString('utf-8')

    const req = {
        headers: {}
    }

    if (contents.startsWith('event: {')) {
        const event = JSON.parse(contents.substring(7))
        Object.keys(event.request.headers).forEach(key => {
            req.headers[key.toLowerCase()] = event.request.headers[key]
        })
        req.body = event.request.payload
        req.rawBody = JSON.stringify(req.body)
        req.method = 'POST'
    } else {
        const payloadOffset = contents.indexOf('\n{')
        if (payloadOffset < 0) throw new Error(`Could not find start of payload in ${path}`)
        contents.substring(0, payloadOffset).split(/\r?\n/).forEach(line => {
            const colon = line.indexOf(':')
            if (colon < 0) return

            const key = line.substring(0, colon).toLowerCase()
            const value = line.substring(colon + 1).replace(/^\s+/, '')

            if (key === 'request method') req.method = value
            else req.headers[key] = value
        })
        req.rawBody = contents.substring(payloadOffset + 1)
            // In https://github.com/organizations/git-for-windows/settings/apps/gitforwindowshelper/advanced,
            // the JSON is pretty-printed, but the actual webhook event avoids any
            // unnecessary white-space in the body
            .replace(/\r?\n\s*("[^"]*":)\s*/g, '$1')
            .replace(/\r?\n\s*/g, '')
        req.body = JSON.parse(req.rawBody)
    }

    const context = {
        log: console.log,
        req,
    }

    const localSettings = JSON.parse(fs.readFileSync('local.settings.json'))
    Object.entries(localSettings.Values).forEach(([key, value]) => process.env[key] = value)

    // avoid accidentally triggering anything
    delete process.env.GITHUB_APP_PRIVATE_KEY
    delete process.env.AZURE_PIPELINE_TRIGGER_TOKEN

    const index = require('./GitForWindowsHelper/index')
    console.log(await index(context, req) || context.res)
})().catch(console.log)