index.js

const p = require("phin");
const core = require("@actions/core");
const { execSync } = require("child_process");
const fs = require("fs");
const path = require("path");

// Support Functions
const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));

const createCatFile = ({ email, api_key }) => `cat >~/.netrc <<EOF
machine api.heroku.com
    login ${email}
    password ${api_key}
machine git.heroku.com
    login ${email}
    password ${api_key}
EOF`;

const addRemote = ({ app_name, buildpack }) => {
  try {
    execSync("heroku git:remote --app " + app_name);
    console.log("Added git remote heroku");
  } catch (err) {
    execSync(
      "heroku create " +
        app_name +
        (buildpack ? " --buildpack " + buildpack : "")
    );
    console.log("Successfully created a new heroku app");
  }
};

const addConfig = ({ app_name, env_file, appdir }) => {
  let configVars = [];
  for (let key in process.env) {
    if (key.startsWith("HD_")) {
      configVars.push(key.substring(3) + "=" + process.env[key]);
    }
  }
  if (env_file) {
    const env = fs.readFileSync(path.join(appdir, env_file), "utf8");
    const variables = require("dotenv").parse(env);
    const newVars = [];
    for (let key in variables) {
      newVars.push(key + "=" + variables[key]);
    }
    configVars = [...configVars, ...newVars];
  }
  if (configVars.length !== 0) {
    execSync(`heroku config:set --app=${app_name} ${configVars.join(" ")}`);
  }
};

const createProcfile = ({ procfile, appdir }) => {
  if (procfile) {
    fs.writeFileSync(path.join(appdir, "Procfile"), procfile);
    execSync(`git add -A && git commit -m "Added Procfile"`);
    console.log("Written Procfile with custom configuration");
  }
};

const deploy = ({
  dontuseforce,
  app_name,
  branch,
  usedocker,
  dockerHerokuProcessType,
  dockerBuildArgs,
  appdir,
}) => {
  const force = !dontuseforce ? "--force" : "";
  if (usedocker) {
    execSync(
      `heroku container:push ${dockerHerokuProcessType} --app ${app_name} ${dockerBuildArgs}`,
      appdir ? { cwd: appdir } : null
    );
    execSync(
      `heroku container:release ${dockerHerokuProcessType} --app ${app_name}`,
      appdir ? { cwd: appdir } : null
    );
  } else {
    if (appdir === "") {
      execSync(`git push heroku ${branch}:refs/heads/master ${force}`);
    } else {
      execSync(
        `git push ${force} heroku \`git subtree split --prefix=${appdir} ${branch}\`:refs/heads/master`
      );
    }
  }
};

const healthcheckFailed = ({
  rollbackonhealthcheckfailed,
  app_name,
  appdir,
}) => {
  if (rollbackonhealthcheckfailed) {
    execSync(
      `heroku rollback --app ${app_name}`,
      appdir ? { cwd: appdir } : null
    );
    core.setFailed(
      "Health Check Failed. Error deploying Server. Deployment has been rolled back. Please check your logs on Heroku to try and diagnose the problem"
    );
  } else {
    core.setFailed(
      "Health Check Failed. Error deploying Server. Please check your logs on Heroku to try and diagnose the problem"
    );
  }
};

// Input Variables
let heroku = {
  api_key: core.getInput("heroku_api_key"),
  email: core.getInput("heroku_email"),
  app_name: core.getInput("heroku_app_name"),
  buildpack: core.getInput("buildpack"),
  branch: core.getInput("branch"),
  dontuseforce: core.getInput("dontuseforce") === "true" ? true : false,
  usedocker: core.getInput("usedocker") === "true" ? true : false,
  dockerHerokuProcessType: core.getInput("docker_heroku_process_type"),
  dockerBuildArgs: core.getInput("docker_build_args"),
  appdir: core.getInput("appdir"),
  healthcheck: core.getInput("healthcheck"),
  checkstring: core.getInput("checkstring"),
  delay: parseInt(core.getInput("delay")),
  procfile: core.getInput("procfile"),
  rollbackonhealthcheckfailed:
    core.getInput("rollbackonhealthcheckfailed") === "true" ? true : false,
  env_file: core.getInput("env_file"),
};

// Formatting
if (heroku.appdir) {
  heroku.appdir =
    heroku.appdir[0] === "." && heroku.appdir[1] === "/"
      ? heroku.appdir.slice(2)
      : heroku.appdir[0] === "/"
      ? heroku.appdir.slice(1)
      : heroku.appdir;
}

// Collate docker build args into arg list
if (heroku.dockerBuildArgs) {
  heroku.dockerBuildArgs = heroku.dockerBuildArgs
    .split("\n")
    .map((arg) => `${arg}=${process.env[arg]}`)
    .join(",");
  heroku.dockerBuildArgs = heroku.dockerBuildArgs
    ? `--arg ${heroku.dockerBuildArgs}`
    : "";
}

(async () => {
  // Program logic
  try {
    // Check if using Docker
    if (!heroku.usedocker) {
      // Check if Repo clone is shallow
      const isShallow = execSync(
        "git rev-parse --is-shallow-repository"
      ).toString();

      // If the Repo clone is shallow, make it unshallow
      if (isShallow === "true\n") {
        execSync("git fetch --prune --unshallow");
      }
    }

    execSync(createCatFile(heroku));
    console.log("Created and wrote to ~/.netrc");

    createProcfile(heroku);

    execSync("heroku login");
    if (heroku.usedocker) {
      execSync("heroku container:login");
    }
    console.log("Successfully logged into heroku");

    addRemote(heroku);
    addConfig(heroku);

    try {
      deploy({ ...heroku, dontuseforce: true });
    } catch (err) {
      console.error(`
            Unable to push branch because the branch is behind the deployed branch. Using --force to deploy branch. 
            (If you want to avoid this, set dontuseforce to 1 in with: of .github/workflows/action.yml. 
            Specifically, the error was: ${err}
        `);

      deploy(heroku);
    }

    if (heroku.healthcheck) {
      if (typeof heroku.delay === "number" && heroku.delay !== NaN) {
        await sleep(heroku.delay * 1000);
      }

      try {
        const res = await p(heroku.healthcheck);
        if (heroku.checkstring && heroku.checkstring !== res.body.toString()) {
          healthcheckFailed(heroku);
        }
        console.log(res.body.toString());
      } catch (err) {
        console.log(err.message);
        healthcheckFailed(heroku);
      }
    }

    core.setOutput(
      "status",
      "Successfully deployed heroku app from branch " + heroku.branch
    );
  } catch (err) {
    core.setFailed(err.toString());
  }
})();