Add HTTP endpoints for GET/POST reviews.

* GET /reviews (packageName, nextPageToken) => get list of reviews
* POST /reviews => Not implemented

api.py

@@ -0,0 +1,43 @@
+import os
+
+from flask import Flask, make_response, request
+from flask.json import jsonify
+
+from mozapkpublisher.common.googleplay import connect
+
+
+app = Flask(__name__)
+
+
+# Settings
+PLAY_ACCOUNT = os.getenv('PLAY_ACCOUNT')
+PLAY_CREDENTIALS_PATH = os.getenv('PLAY_CREDENTIALS_PATH')
+
+
+def get_reviews_service():
+    """Create new instance of google play API service."""
+    service = connect(PLAY_ACCOUNT, PLAY_CREDENTIALS_PATH)
+    return service.reviews()
+
+
+@app.route('/reviews', methods=['GET'])
+def get_reviews():
+    """Get playstore reviews. Proxy playstore API requests."""
+    packageName = request.args.get('packageName', None)
+    nextPageToken = request.args.get('nextPageToken', None)
+
+    if not packageName:
+        content = jsonify(msg='Missing `packageName` from request query')
+        return make_response(content, 400)
+
+    reviews_service = get_reviews_service()
+    query = reviews_service.list(packageName=packageName, token=nextPageToken)
+
+    return make_response(jsonify(query.execute()), 200)
+
+
+@app.route('/reviews', methods=['POST'])
+def post_reviews():
+    """Post playstore reviews."""
+
+    return make_response(jsonify(msg='POST method not implemented'), 501)