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import * as fs from 'node:fs'
import * as os from 'node:os'
import * as crypto from 'node:crypto'
/** Based on https://github.com/actions/toolkit/blob/4e3b068ce116d28cb840033c02f912100b4592b0/packages/core/src/file-command.ts */
export function setOutput(key, value) {
const filePath = process.env['GITHUB_OUTPUT'] || ''
if (filePath) {
return issueFileCommand('OUTPUT', prepareKeyValueMessage(key, value))
}
process.stdout.write(os.EOL)
}
function issueFileCommand(command, message) {
const filePath = process.env[`GITHUB_${command}`]
if (!filePath) {
throw new Error(
`Unable to find environment variable for file command ${command}`
)
}
if (!fs.existsSync(filePath)) {
throw new Error(`Missing file at path: ${filePath}`)
}
fs.appendFileSync(filePath, `${toCommandValue(message)}${os.EOL}`, {
encoding: 'utf8'
})
}
function prepareKeyValueMessage(key, value) {
const delimiter = `gh-delimiter-${crypto.randomUUID()}`
const convertedValue = toCommandValue(value)
// These should realistically never happen, but just in case someone finds a
// way to exploit uuid generation let's not allow keys or values that contain
// the delimiter.
if (key.includes(delimiter)) {
throw new Error(
`Unexpected input: name should not contain the delimiter "${delimiter}"`
)
}
if (convertedValue.includes(delimiter)) {
throw new Error(
`Unexpected input: value should not contain the delimiter "${delimiter}"`
)
}
return `${key}<<${delimiter}${os.EOL}${convertedValue}${os.EOL}${delimiter}`
}
function toCommandValue(input) {
if (input === null || input === undefined) {
return ''
} else if (typeof input === 'string' || input instanceof String) {
return input
}
return JSON.stringify(input)
}
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