Validate Content with HTTP Request

enforcer/file/common/src/main/java/com/optum/sourcehawk/enforcer/file/http/ContentHttpValidated.java

@@ -0,0 +1,103 @@
+package com.optum.sourcehawk.enforcer.file.http;
+
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import com.optum.sourcehawk.enforcer.EnforcerResult;
+import com.optum.sourcehawk.enforcer.file.AbstractFileEnforcer;
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Builder.Default;
+import lombok.NonNull;
+import lombok.val;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.stream.Collectors;
+
+/**
+ * A file enforcer which makes an HTTP request to the configured URL
+ * to validate the file contents
+ *
+ * @author brianwyka
+ */
+@Builder(builderClassName = "Builder")
+@JsonDeserialize(builder = ContentHttpValidated.Builder.class)
+@AllArgsConstructor(staticName = "validated")
+public class ContentHttpValidated extends AbstractFileEnforcer {
+
+    private static final int DEFAULT_BUFFER_SIZE = 8192;
+    private static final String HTTP_RESPONSE_VALIDATION_MESSAGE_TEMPLATE = "Validation failed with reason: %s";
+    private static final String HTTP_RESPONSE_ERROR_MESSAGE_TEMPLATE = "HTTP [%s] error performing validation: %s";
+
+    /**
+     * The URL in which to make a POST request, to validate the file contents
+     */
+    private final String url;
+
+    /**
+     * The amount of time allowed to connect to URL before timing out
+     */
+    @Default
+    private final int connectTimeout = 500;
+
+    /**
+     * The amount of time allowed to read the response from URL before timing out
+     */
+    @Default
+    private final int readTimeout = 500;
+    /**
+     * The amount of time allowed to read the response from URL before timing out
+     */
+    @Default
+    private final String method = "POST";
+
+    /**
+     * The amount of time allowed to read the response from URL before timing out
+     */
+    @Default
+    private final String contentTypeHeader = "text/plain";
+
+    /**
+     * The amount of time allowed to read the response from URL before timing out
+     */
+    @Default
+    private final String acceptHeader = "text/plain";
+
+
+    /** {@inheritDoc} */
+    @Override
+    protected EnforcerResult enforceInternal(final @NonNull InputStream actualFileInputStream) throws IOException {
+        val httpUrlConnection = (HttpURLConnection) new URL(url).openConnection();
+        httpUrlConnection.setDoOutput(true);
+        httpUrlConnection.setRequestMethod(method);
+        httpUrlConnection.setRequestProperty("Content-Type", contentTypeHeader);
+        httpUrlConnection.setRequestProperty("Accept", acceptHeader);
+        httpUrlConnection.setConnectTimeout(connectTimeout);
+        httpUrlConnection.setReadTimeout(readTimeout);
+        try (val outputStream = httpUrlConnection.getOutputStream()) {
+            val buffer = new byte[DEFAULT_BUFFER_SIZE];
+            int read;
+            while ((read = actualFileInputStream.read(buffer, 0, DEFAULT_BUFFER_SIZE)) >= 0) {
+                outputStream.write(buffer, 0, read);
+            }
+        }
+        val responseCode = httpUrlConnection.getResponseCode();
+        if (responseCode >= 200 && responseCode < 300) {
+            return EnforcerResult.passed();
+        }
+        try (val errorStream = httpUrlConnection.getErrorStream();
+             val bufferedReader = new BufferedReader(new InputStreamReader(errorStream))) {
+            val responseMessage = bufferedReader.lines()
+                .collect(Collectors.joining());
+            if (responseCode >= 400 && responseCode < 500) {
+                return EnforcerResult.failed(String.format(HTTP_RESPONSE_VALIDATION_MESSAGE_TEMPLATE, responseMessage));
+            } else {
+                return EnforcerResult.failed(String.format(HTTP_RESPONSE_ERROR_MESSAGE_TEMPLATE, responseCode, responseMessage));
+            }
+        }
+    }
+
+}