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@@ -12,4 +12,3 @@ buildNumber.properties | |
| # IntelliJ | ||
| .idea/ | ||
| *.iml | ||
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167 changes: 167 additions & 0 deletions
167
...kotlin/com/github/lernejo/korekto/toolkit/thirdparty/github/GitHubAuthenticationHolder.kt
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| package com.github.lernejo.korekto.toolkit.thirdparty.github | ||
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| import io.jsonwebtoken.JwtBuilder | ||
| import io.jsonwebtoken.Jwts | ||
| import io.jsonwebtoken.security.SecureDigestAlgorithm | ||
| import org.bouncycastle.jce.provider.BouncyCastleProvider | ||
| import org.eclipse.jgit.api.GitCommand | ||
| import org.eclipse.jgit.api.TransportCommand | ||
| import org.eclipse.jgit.transport.UsernamePasswordCredentialsProvider | ||
| import org.kohsuke.github.GitHubBuilder | ||
| import org.testcontainers.shaded.org.bouncycastle.openssl.PEMKeyPair | ||
| import org.testcontainers.shaded.org.bouncycastle.openssl.PEMParser | ||
| import org.testcontainers.shaded.org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter | ||
| import java.io.File | ||
| import java.io.FileReader | ||
| import java.net.HttpURLConnection | ||
| import java.security.PrivateKey | ||
| import java.security.PublicKey | ||
| import java.security.Security | ||
| import java.time.Instant | ||
| import java.util.* | ||
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| object GitHubAuthenticationHolder { | ||
| val auth: GitHubAuthentication by lazy { | ||
| val token = System.getProperty("github_token") | ||
| val appId = System.getProperty("github_app_id") | ||
| val appPk = System.getProperty("github_app_pk") | ||
| if (token != null) { | ||
| TokenGitHubAuthentication(token) | ||
| } else if (appId != null && appPk != null) { | ||
| AppGitHubAuthentication(appId, appPk) | ||
| } else { | ||
| NoopTokenGitHubAuthentication() | ||
| } | ||
| } | ||
| } | ||
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| interface GitHubAuthentication { | ||
| val type: String | ||
| fun <R, C : GitCommand<R>> configure(command: TransportCommand<in C, R>) | ||
| fun configure(conn: HttpURLConnection) | ||
| fun configure(builder: GitHubBuilder) | ||
| } | ||
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| class NoopTokenGitHubAuthentication : GitHubAuthentication { | ||
| override val type = "noop" | ||
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| override fun <R, C : GitCommand<R>> configure(command: TransportCommand<in C, R>) { | ||
| } | ||
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| override fun configure(conn: HttpURLConnection) { | ||
| } | ||
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| override fun configure(builder: GitHubBuilder) { | ||
| } | ||
| } | ||
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| data class TokenGitHubAuthentication(val token: String) : GitHubAuthentication { | ||
| override val type = "token" | ||
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| override fun <R, C : GitCommand<R>> configure(command: TransportCommand<in C, R>) { | ||
| command | ||
| .setCredentialsProvider(UsernamePasswordCredentialsProvider(token, "")) | ||
| } | ||
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| override fun configure(conn: HttpURLConnection) { | ||
| conn.setRequestProperty("Authorization", "token $token") | ||
| } | ||
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| override fun configure(builder: GitHubBuilder) { | ||
| builder.withOAuthToken(token) | ||
| } | ||
| } | ||
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| class AppGitHubAuthentication(private val appId: String, appPk: String) : GitHubAuthentication { | ||
| override val type = "app-$appId (installation: " + getToken().installationId + ")" | ||
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| companion object { | ||
| init { | ||
| Security.removeProvider("BC") //remove old/legacy Android-provided BC provider | ||
| Security.addProvider(BouncyCastleProvider()) // add 'real'/correct BC provider | ||
| } | ||
| } | ||
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| private val privateKey = readPrivateKey(appPk) | ||
| private var jwt: Jwt? = null | ||
| private val tokensByUser: MutableMap<String, InstallationToken> = mutableMapOf() | ||
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| override fun <R, C : GitCommand<R>> configure(command: TransportCommand<in C, R>) { | ||
| command.setCredentialsProvider(UsernamePasswordCredentialsProvider("x-access-token", getToken().token)) | ||
| } | ||
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| override fun configure(conn: HttpURLConnection) { | ||
| val token = getToken().token | ||
| conn.setRequestProperty("Authorization", "Bearer $token") | ||
| } | ||
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| override fun configure(builder: GitHubBuilder) { | ||
| builder.withAppInstallationToken(getToken().token) | ||
| } | ||
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| private fun getToken(): InstallationToken { | ||
| val user = System.getProperty("github_user") ?: throw IllegalStateException("Missing github_user env prop") | ||
| val token = tokensByUser[user] | ||
| if (token == null || token.isExpired()) { | ||
| tokensByUser[user] = refreshToken(user) | ||
| } | ||
| return tokensByUser[user]!! | ||
| } | ||
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| private fun refreshToken(user: String): InstallationToken { | ||
| val jwt = getJwt() | ||
| val gitHubApp = GitHubBuilder().withJwtToken(jwt).build() | ||
| val installation = gitHubApp.app.getInstallationByUser(user) | ||
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| val tokenResponse = installation.createToken().create() | ||
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| return InstallationToken(tokenResponse.token, installation.id, tokenResponse.expiresAt.toInstant()) | ||
| } | ||
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| private fun getJwt(): String { | ||
| if (jwt == null || jwt!!.isExpired()) { | ||
| jwt = createJWT(appId, 590000, privateKey) | ||
| } | ||
| return jwt!!.token | ||
| } | ||
| } | ||
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| class Jwt(val token: String, private val start: Long, private val duration: Long) { | ||
| fun isExpired() = (start + duration - 10_000) > System.currentTimeMillis() | ||
| } | ||
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| class InstallationToken(val token: String, val installationId: Long, private val expiresAt: Instant) { | ||
| fun isExpired() = expiresAt.isAfter(Instant.now().minusSeconds(60L)) | ||
| } | ||
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| fun readPrivateKey(filename: String): PrivateKey { | ||
| val pemParser = PEMParser(FileReader(File(filename))) | ||
| val o: PEMKeyPair = pemParser.readObject() as PEMKeyPair | ||
| val converter = JcaPEMKeyConverter().setProvider("BC") | ||
| val kp = converter.getKeyPair(o) | ||
| return kp.private | ||
| } | ||
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| fun createJWT(githubAppId: String, ttlMillis: Long, privateKey: PrivateKey): Jwt { | ||
| //The JWT signature algorithm we will be using to sign the token | ||
| val signatureAlgorithm: SecureDigestAlgorithm<PrivateKey, PublicKey> = Jwts.SIG.RS256 | ||
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| val nowMillis = System.currentTimeMillis() | ||
| val now = Date(nowMillis) | ||
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| //Let's set the JWT Claims | ||
| val builder: JwtBuilder = Jwts.builder() | ||
| .issuedAt(now) | ||
| .issuer(githubAppId) | ||
| .signWith(privateKey, signatureAlgorithm) | ||
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| //if it has been specified, let's add the expiration | ||
| if (ttlMillis > 0) { | ||
| val expMillis = nowMillis + ttlMillis | ||
| val exp = Date(expMillis) | ||
| builder.expiration(exp) | ||
| } | ||
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| //Builds the JWT and serializes it to a compact, URL-safe string | ||
| return Jwt(builder.compact(), nowMillis, ttlMillis) | ||
| } |
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