Move API docs redirects to CloudFront

docs/Makefile

@@ -51,15 +51,11 @@ dist-docs_versions: $(OUTPUT_DIR)/versions-$(CRYSTAL_VERSION).json ## Update `/v
 $(OUTPUT_DIR)/versions-$(CRYSTAL_VERSION).json: $(OUTPUT_DIR)/$(OUTPUT_DOCS_BASE_NAME).tar.gz
 
 .PHONY: dist-redirect_latest
-dist-redirect_latest: $(OUTPUT_DIR)/aws-config.json ## Apply redirect from `api/latest` to `api/$(CRYSTAL_VERSION)` in S3 (needs to be manually applied)
-	$(AWS_CLI) s3api put-bucket-website --bucket "$(AWS_BUCKET)" --website-configuration "file://$<"
+dist-redirect_latest: $(OUTPUT_DIR)/aws-cloudfront-redirect.js ## Apply redirect from `api/latest` to `api/$(CRYSTAL_VERSION)` in CloudFront (needs to be manually applied)
+	$(AWS_CLI) cloudfront update-function --name crystal-api-docs-redirects --if-match "$$($(AWS_CLI) cloudfront describe-function --name crystal-api-docs-redirects --output text --query 'ETag')" --function-config '{"Runtime":"cloudfront-js-2.0","Comment":"Redirects for Crystal API docs $(CRYSTAL_VERSION)"}' --function-code "$(shell base64 -i $(OUTPUT_DIR)/aws-cloudfront-redirect.js)"
 
-.PHONY: get-website-configuration
-get-website-configuration: ## Pull website configuration from S3 bucket (run as `make pull-website-configuration -s > aws-config.json`)
-	$(AWS_CLI) s3api get-bucket-website --bucket "$(AWS_BUCKET)"
-
-.PHONY: $(OUTPUT_DIR)/aws-config.json
-$(OUTPUT_DIR)/aws-config.json: aws-config.json $(OUTPUT_DIR)
+.PHONY: $(OUTPUT_DIR)/aws-cloudfront-redirect.js
+$(OUTPUT_DIR)/aws-cloudfront-redirect.js: aws-cloudfront-redirect.js $(OUTPUT_DIR)
 	sed 's/$${CRYSTAL_VERSION}/$(CRYSTAL_VERSION)/g' "$<" > $@
 
 .PHONY: help

docs/aws-cloudfront-redirect.js

@@ -0,0 +1,29 @@
+function redirect(path) {
+  return {
+    statusCode: 302,
+    headers: {
+      'location': { value: path }
+    }
+  }
+}
+
+function handler(event) {
+  if (event.response.statusCode != 404) {
+    // We'll only handle some 404 errors
+    return event.response
+  }
+
+  var requestPath = event.request.uri
+
+  if(requestPath == '/api' || requestPath == '/api/') {
+    return redirect('/api/${CRYSTAL_VERSION}/')
+  }
+
+  if(requestPath.startsWith('/api/latest/')) {
+    return redirect(requestPath.replace('/api/latest/', '/api/${CRYSTAL_VERSION}/'))
+  } else if(requestPath.startsWith('/api/') && !(requestPath.startsWith('/api/0') || requestPath.startsWith('/api/1') || requestPath.startsWith('/api/master/'))) {
+    return redirect(requestPath.replace('/api/', '/api/${CRYSTAL_VERSION}/'))
+  }
+
+  return event.response
+}