feat: download existing files from s3 (#16)

download.js

@@ -0,0 +1,52 @@
+const AWS = require("aws-sdk");
+const fs = require("fs");
+
+const { AWS_ACCESS_KEY, AWS_SECRET_KEY, AWS_BUCKET } = require("./aws");
+
+const s3 = new AWS.S3({
+  accessKeyId: AWS_ACCESS_KEY,
+  secretAccessKey: AWS_SECRET_KEY,
+});
+
+const downloadFiles = (user, repo) => {
+  const path = `${user}-${repo}`;
+  const indexFile = "index.html";
+  const readmeFile = "README.md";
+
+  pullFromS3(path, indexFile);
+  pullFromS3(path, readmeFile);
+};
+
+const pullFromS3 = (path, file) => {
+  const params = {
+    Bucket: AWS_BUCKET,
+    Key: `${path}/${file}`,
+  };
+
+  s3.headObject(params)
+    .on("success", (response) => {
+      s3.getObject(params, (err, data) => {
+        if (err) throw err;
+        writeFile(path, file, data);
+      });
+    })
+    .on("error", (err) => {
+      return "";
+    })
+    .send();
+};
+
+const writeFile = (path, file, data) => {
+  if (!fs.existsSync("./_docs/")) {
+    fs.mkdirSync("./_docs/");
+  }
+
+  if (!fs.existsSync(`./_docs/${path}/`)) {
+    fs.mkdirSync(`./_docs/${path}/`);
+  }
+
+  fs.writeFileSync(`./_docs/${path}/${file}`, data.Body.toString());
+  console.log(`Downloaded ${file}`);
+};
+
+module.exports = { downloadFiles };