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const url = require('url')
const getProtocols = require('./protocols.js')
const lastIndexOfBefore = (str, char, beforeChar) => {
const startPosition = str.indexOf(beforeChar)
return str.lastIndexOf(char, startPosition > -1 ? startPosition : Infinity)
}
const safeUrl = (u) => {
try {
return new url.URL(u)
} catch {
// this fn should never throw
}
}
// accepts input like git:github.com:user/repo and inserts the // after the first :
const correctProtocol = (arg, protocols) => {
const firstColon = arg.indexOf(':')
const proto = arg.slice(0, firstColon + 1)
if (Object.prototype.hasOwnProperty.call(protocols, proto)) {
return arg
}
const firstAt = arg.indexOf('@')
if (firstAt > -1) {
if (firstAt > firstColon) {
return `git+ssh://${arg}`
} else {
return arg
}
}
const doubleSlash = arg.indexOf('//')
if (doubleSlash === firstColon + 1) {
return arg
}
return `${arg.slice(0, firstColon + 1)}//${arg.slice(firstColon + 1)}`
}
// attempt to correct an scp style url so that it will parse with `new URL()`
const correctUrl = (giturl) => {
// ignore @ that come after the first hash since the denotes the start
// of a committish which can contain @ characters
const firstAt = lastIndexOfBefore(giturl, '@', '#')
// ignore colons that come after the hash since that could include colons such as:
// git@github.com:user/package-2#semver:^1.0.0
const lastColonBeforeHash = lastIndexOfBefore(giturl, ':', '#')
if (lastColonBeforeHash > firstAt) {
// the last : comes after the first @ (or there is no @)
// like it would in:
// proto://hostname.com:user/repo
// username@hostname.com:user/repo
// :password@hostname.com:user/repo
// username:password@hostname.com:user/repo
// proto://username@hostname.com:user/repo
// proto://:password@hostname.com:user/repo
// proto://username:password@hostname.com:user/repo
// then we replace the last : with a / to create a valid path
giturl = giturl.slice(0, lastColonBeforeHash) + '/' + giturl.slice(lastColonBeforeHash + 1)
}
if (lastIndexOfBefore(giturl, ':', '#') === -1 && giturl.indexOf('//') === -1) {
// we have no : at all
// as it would be in:
// username@hostname.com/user/repo
// then we prepend a protocol
giturl = `git+ssh://${giturl}`
}
return giturl
}
module.exports = (giturl, protocols = getProtocols()) => {
const withProtocol = correctProtocol(giturl, protocols)
return safeUrl(withProtocol) || safeUrl(correctUrl(withProtocol))
}
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