Signup added. Backend added

node_modules/@mapbox/node-pre-gyp/lib/unpublish.js

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+'use strict';
+
+module.exports = exports = unpublish;
+
+exports.usage = 'Unpublishes pre-built binary (requires aws-sdk)';
+
+const log = require('npmlog');
+const versioning = require('./util/versioning.js');
+const napi = require('./util/napi.js');
+const s3_setup = require('./util/s3_setup.js');
+const url = require('url');
+
+function unpublish(gyp, argv, callback) {
+  const package_json = gyp.package_json;
+  const napi_build_version = napi.get_napi_build_version_from_command_args(argv);
+  const opts = versioning.evaluate(package_json, gyp.opts, napi_build_version);
+  const config = {};
+  s3_setup.detect(opts, config);
+  const s3 = s3_setup.get_s3(config);
+  const key_name = url.resolve(config.prefix, opts.package_name);
+  const s3_opts = {
+    Bucket: config.bucket,
+    Key: key_name
+  };
+  s3.headObject(s3_opts, (err, meta) => {
+    if (err && err.code === 'NotFound') {
+      console.log('[' + package_json.name + '] Not found: https://' + s3_opts.Bucket + '.s3.amazonaws.com/' + s3_opts.Key);
+      return callback();
+    } else if (err) {
+      return callback(err);
+    } else {
+      log.info('unpublish', JSON.stringify(meta));
+      s3.deleteObject(s3_opts, (err2, resp) => {
+        if (err2) return callback(err2);
+        log.info(JSON.stringify(resp));
+        console.log('[' + package_json.name + '] Success: removed https://' + s3_opts.Bucket + '.s3.amazonaws.com/' + s3_opts.Key);
+        return callback();
+      });
+    }
+  });
+}