Rename module to external-sop and make backend in tests configurable

external-sop/src/main/java/sop/external/operation/GenerateKeyExternal.java

@@ -0,0 +1,89 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package sop.external.operation;
+
+import sop.Ready;
+import sop.exception.SOPGPException;
+import sop.operation.GenerateKey;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.List;
+
+public class GenerateKeyExternal implements GenerateKey {
+
+    private final String binary;
+    private boolean noArmor = false;
+    private List<String> userIds = new ArrayList<>();
+    private String keyPassword;
+
+    private final Runtime runtime = Runtime.getRuntime();
+
+    public GenerateKeyExternal(String binary) {
+        this.binary = binary;
+    }
+
+    @Override
+    public GenerateKey noArmor() {
+        this.noArmor = true;
+        return this;
+    }
+
+    @Override
+    public GenerateKey userId(String userId) {
+        this.userIds.add(userId);
+        return this;
+    }
+
+    @Override
+    public GenerateKey withKeyPassword(String password)
+            throws SOPGPException.PasswordNotHumanReadable, SOPGPException.UnsupportedOption {
+        this.keyPassword = password;
+        return this;
+    }
+
+    @Override
+    public Ready generate()
+            throws SOPGPException.MissingArg, SOPGPException.UnsupportedAsymmetricAlgo {
+        List<String> commandList = new ArrayList<>();
+
+        commandList.add(binary);
+        commandList.add("generate-key");
+
+        if (noArmor) {
+            commandList.add("--no-armor");
+        }
+
+        if (keyPassword != null) {
+            commandList.add("--with-key-password");
+            commandList.add(keyPassword);
+        }
+
+        for (String userId : userIds) {
+            commandList.add(userId);
+        }
+
+        String[] command = commandList.toArray(new String[0]);
+        try {
+            Process process = runtime.exec(command);
+            InputStream stdIn = process.getInputStream();
+
+            return new Ready() {
+                @Override
+                public void writeTo(OutputStream outputStream) throws IOException {
+                    byte[] buf = new byte[4096];
+                    int r;
+                    while ((r = stdIn.read(buf)) >= 0) {
+                        outputStream.write(buf, 0, r);
+                    }
+                }
+            };
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}