Challenge can have multiple errors

acme4j-client/src/main/java/org/shredzone/acme4j/challenge/Challenge.java

@@ -13,9 +13,13 @@
  */
 package org.shredzone.acme4j.challenge;
 
+import static java.util.stream.Collectors.toList;
+
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.time.Instant;
+import java.util.Collections;
+import java.util.List;
 import java.util.Objects;
 
 import org.shredzone.acme4j.AcmeResource;
@@ -27,6 +31,7 @@ import org.shredzone.acme4j.exception.AcmeException;
 import org.shredzone.acme4j.exception.AcmeProtocolException;
 import org.shredzone.acme4j.exception.AcmeRetryAfterException;
 import org.shredzone.acme4j.util.JSON;
+import org.shredzone.acme4j.util.JSON.Array;
 import org.shredzone.acme4j.util.JSONBuilder;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -48,7 +53,7 @@ public class Challenge extends AcmeResource {
     protected static final String KEY_URL = "url";
     protected static final String KEY_STATUS = "status";
     protected static final String KEY_VALIDATED = "validated";
-    protected static final String KEY_ERROR = "error";
+    protected static final String KEY_ERRORS = "errors";
 
     private JSON data = JSON.empty();
 
@@ -120,10 +125,27 @@ public class Challenge extends AcmeResource {
     }
 
     /**
-     * Returns the reason why the challenge failed, if returned by the server.
+     * Returns a list of reasons why the challenge has failed in the past, if returned by
+     * the server. New errors are always appended to the end of the list.
      */
-    public Problem getError() {
-        return data.get(KEY_ERROR).asProblem(getLocation());
+    public List<Problem> getErrors() {
+        URL location = getLocation();
+        return Collections.unmodifiableList(data.get(KEY_ERRORS).asArray().stream()
+                        .map(it -> it.asProblem(location))
+                        .collect(toList()));
+    }
+
+    /**
+     * Returns the last reason why the challenge has failed, if returned by the server.
+     * {@code null} if there are no errors.
+     */
+    public Problem getLastError() {
+        Array errors = data.get(KEY_ERRORS).asArray();
+        if (!errors.isEmpty()) {
+            return errors.get(errors.size() - 1).asProblem(getLocation());
+        } else {
+            return null;
+        }
     }
 
     /**

acme4j-client/src/test/java/org/shredzone/acme4j/challenge/ChallengeTest.java

@@ -26,10 +26,12 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.time.Duration;
 import java.time.Instant;
+import java.util.List;
 
 import org.jose4j.lang.JoseException;
 import org.junit.Before;
 import org.junit.Test;
+import org.shredzone.acme4j.Problem;
 import org.shredzone.acme4j.Session;
 import org.shredzone.acme4j.Status;
 import org.shredzone.acme4j.exception.AcmeException;
@@ -111,14 +113,26 @@ public class ChallengeTest {
         assertThat(challenge.getStatus(), is(Status.INVALID));
         assertThat(challenge.getLocation(), is(url("http://example.com/challenge/123")));
         assertThat(challenge.getValidated(), is(parseTimestamp("2015-12-12T17:19:36.336785823Z")));
-        assertThat(challenge.getError(), is(notNullValue()));
-        assertThat(challenge.getError().getType(), is(URI.create("urn:ietf:params:acme:error:connection")));
-        assertThat(challenge.getError().getDetail(), is("connection refused"));
-        assertThat(challenge.getError().getInstance(), is(URI.create("http://example.com/documents/error.html")));
         assertThat(challenge.getJSON().get("type").asString(), is("generic-01"));
         assertThat(challenge.getJSON().get("url").asURL(), is(url("http://example.com/challenge/123")));
         assertThat(challenge.getJSON().get("not-present").asString(), is(nullValue()));
         assertThat(challenge.getJSON().get("not-present-url").asURL(), is(nullValue()));
+
+        List<Problem> errors = challenge.getErrors();
+        assertThat(errors, is(notNullValue()));
+        assertThat(errors, hasSize(2));
+        assertThat(errors.get(0).getType(), is(URI.create("urn:ietf:params:acme:error:connection")));
+        assertThat(errors.get(0).getDetail(), is("connection refused"));
+        assertThat(errors.get(0).getInstance(), is(URI.create("http://example.com/documents/error.html")));
+        assertThat(errors.get(1).getType(), is(URI.create("urn:ietf:params:acme:error:incorrectResponse")));
+        assertThat(errors.get(1).getDetail(), is("bad token"));
+        assertThat(errors.get(1).getInstance(), is(URI.create("http://example.com/documents/faq.html")));
+
+        Problem lastError = challenge.getLastError();
+        assertThat(lastError, is(notNullValue()));
+        assertThat(lastError.getType(), is(URI.create("urn:ietf:params:acme:error:incorrectResponse")));
+        assertThat(lastError.getDetail(), is("bad token"));
+        assertThat(lastError.getInstance(), is(URI.create("http://example.com/documents/faq.html")));
     }
 
     /**

acme4j-client/src/test/resources/json/genericChallenge.json

@@ -3,9 +3,16 @@
   "status": "invalid",
   "url": "http://example.com/challenge/123",
   "validated": "2015-12-12T17:19:36.336785823Z",
-  "error": {
+  "errors": [
+    {
       "type": "urn:ietf:params:acme:error:connection",
       "detail": "connection refused",
       "instance": "/documents/error.html"
+    },
+    {
+      "type": "urn:ietf:params:acme:error:incorrectResponse",
+      "detail": "bad token",
+      "instance": "/documents/faq.html"
     }
+  ]
 }