JCL-403: SolidClient builds ProblemDetails

`SolidClient` now parses HTTP error responses if they are compliant with
RFC9457 in order to throw a structured exception. In case when no JSON
parser is available in the classpath, the default behavior is to build
a ProblemDetails object that only relies on the data available in the
HTTP response status code.

Author: NSeydoux

solid/src/main/java/com/inrupt/client/solid/SolidClient.java

@@ -20,17 +20,10 @@
  */
 package com.inrupt.client.solid;
 
-import static java.nio.charset.StandardCharsets.UTF_8;
-
-import com.inrupt.client.Client;
-import com.inrupt.client.ClientProvider;
-import com.inrupt.client.Headers;
-import com.inrupt.client.RDFSource;
-import com.inrupt.client.Request;
-import com.inrupt.client.Resource;
-import com.inrupt.client.Response;
-import com.inrupt.client.ValidationResult;
+import com.inrupt.client.*;
 import com.inrupt.client.auth.Session;
+import com.inrupt.client.spi.JsonService;
+import com.inrupt.client.spi.ServiceProvider;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -64,11 +57,22 @@ public class SolidClient {
     private final Client client;
     private final Headers defaultHeaders;
     private final boolean fetchAfterWrite;
+    private final JsonService jsonService;
 
     SolidClient(final Client client, final Headers headers, final boolean fetchAfterWrite) {
         this.client = Objects.requireNonNull(client, "Client may not be null!");
         this.defaultHeaders = Objects.requireNonNull(headers, "Headers may not be null!");
         this.fetchAfterWrite = fetchAfterWrite;
+
+        // It is acceptable for a SolidClient instance to be in a classpath without any implementation for
+        // JsonService, in which case the ProblemDetails exceptions will fallback to default and not be parsed.
+        JsonService js;
+        try {
+            js = ServiceProvider.getJsonService();
+        } catch (IllegalStateException e) {
+            js = null;
+        }
+        this.jsonService = js;
     }
 
     /**
@@ -134,8 +138,19 @@ public <T extends Resource> CompletionStage<T> read(final URI identifier, final
         return client.send(request, Response.BodyHandlers.ofByteArray())
             .thenApply(response -> {
                 if (response.statusCode() >= ERROR_STATUS) {
-                    throw SolidClientException.handle("Unable to read resource at " + request.uri(), request.uri(),
-                            response.statusCode(), response.headers(), new String(response.body()));
+                    final ProblemDetails pd = ProblemDetails.fromErrorResponse(
+                        response.statusCode(),
+                        response.headers(),
+                        response.body(),
+                        this.jsonService
+                    );
+                    throw SolidClientException.handle(
+                        "Unable to read resource at " + request.uri(),
+                        pd,
+                        response.uri(),
+                        response.headers(),
+                        new String(response.body())
+                    );
                 } else {
                     final String contentType = response.headers().firstValue(CONTENT_TYPE)
                         .orElse("application/octet-stream");
@@ -284,8 +299,19 @@ public <T extends Resource> CompletionStage<Void> delete(final T resource, final
             if (isSuccess(res.statusCode())) {
                 return null;
             } else {
-                throw SolidClientException.handle("Unable to delete resource", resource.getIdentifier(),
-                        res.statusCode(), res.headers(), new String(res.body(), UTF_8));
+                final ProblemDetails pd = ProblemDetails.fromErrorResponse(
+                    res.statusCode(),
+                    res.headers(),
+                    res.body(),
+                    this.jsonService
+                );
+                throw SolidClientException.handle(
+                    "Unable to delete resource",
+                    pd,
+                    resource.getIdentifier(),
+                    res.headers(),
+                    new String(res.body())
+                );
             }
         });
     }
@@ -371,8 +397,19 @@ <T extends Resource> Function<Response<byte[]>, CompletionStage<T>> handleRespon
             final Headers headers, final String message) {
         return res -> {
             if (!isSuccess(res.statusCode())) {
-                throw SolidClientException.handle(message, resource.getIdentifier(),
-                        res.statusCode(), res.headers(), new String(res.body(), UTF_8));
+                final ProblemDetails pd = ProblemDetails.fromErrorResponse(
+                    res.statusCode(),
+                    res.headers(),
+                    res.body(),
+                    this.jsonService
+                );
+                throw SolidClientException.handle(
+                    message,
+                    pd,
+                    resource.getIdentifier(),
+                    res.headers(),
+                    new String(res.body())
+                );
             }
 
             if (!fetchAfterWrite) {
@@ -382,7 +419,6 @@ <T extends Resource> Function<Response<byte[]>, CompletionStage<T>> handleRespon
             @SuppressWarnings("unchecked")
             final Class<T> clazz = (Class<T>) resource.getClass();
             return read(resource.getIdentifier(), headers, clazz);
-
         };
     }