feat: build trigger handler function

.env.sample

@@ -7,4 +7,6 @@ POSTMARK_API_KEY=
 POSTMARK_STORE_OWNER_EMAIL=
 POSTMARK_STORE_OWNER_NEW_ORDER_TEMPLATE_ID=
 POSTMARK_NEW_ORDER_TEMPLATE_ID=
-POSTMARK_ORDER_DISPATCHED_TEMPLATE_ID=
+POSTMARK_ORDER_DISPATCHED_TEMPLATE_ID=
+BUILD_HOOK=
+BUILD_STAGE_TRIGGER=

functions/deploy-site.js

@@ -0,0 +1,72 @@
+require('dotenv').config();
+
+require('es6-promise').polyfill();
+require('isomorphic-fetch');
+
+const BUILD_HOOK = process.env.BUILD_HOOK;
+const BUILD_STAGE_TRIGGER = process.env.STAGE_TRIGGER;
+
+const BUILD_TRIGGERS = [
+  'createProduct',
+  'updateProduct',
+  'deleteProduct',
+  'createCategory',
+  'updateCategory',
+  'deleteCategory',
+  'createCollection',
+  'updateCollection',
+  'deleteCollection',
+];
+
+exports.handler = async event => {
+  if (!event.body)
+    return {
+      statusCode: 405,
+      message: 'You must provide a payload.',
+    };
+
+  const {
+    stageName,
+    info: { fieldName },
+  } = JSON.parse(event.body);
+
+  if (!req.body)
+    return {
+      statusCode: 422,
+      body: JSON.stringify({
+        message: 'No action required.',
+      }),
+    };
+
+  try {
+    if (
+      stageName === BUILD_STAGE_TRIGGER &&
+      BUILD_TRIGGERS.includes(fieldName)
+    ) {
+      await fetch(BUILD_HOOK, {
+        method: 'post',
+      });
+
+      return {
+        statusCode: 200,
+        body: JSON.stringify({
+          message: 'Build successfully triggered.',
+        }),
+      };
+    }
+
+    return {
+      statusCode: 200,
+      body: JSON.stringify({
+        message: 'No build required.',
+      }),
+    };
+  } catch (err) {
+    console.log(err);
+
+    return {
+      statusCode: 500,
+      body: JSON.stringify(err),
+    };
+  }
+};

package.json

@@ -12,6 +12,7 @@
     "apollo-server-lambda": "2.9.12",
     "classnames": "^2.2.6",
     "currency-formatter": "1.5.5",
+    "es6-promise": "4.2.8",
     "gatsby": "2.17.0",
     "gatsby-image": "^2.2.33",
     "gatsby-plugin-postcss": "2.1.13",

yarn.lock

@@ -4780,6 +4780,11 @@ es-to-primitive@^1.2.0:
     is-date-object "^1.0.1"
     is-symbol "^1.0.2"
 
+es6-promise@4.2.8:
+  version "4.2.8"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
+  integrity sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==
+
 es6-promisify@^6.0.0:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/es6-promisify/-/es6-promisify-6.0.2.tgz#525c23725b8510f5f1f2feb5a1fbad93a93e29b4"