WiP: Implement first prototypes of all SOP commands for external binaries

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

@@ -0,0 +1,65 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package sop.external.operation;
+
+import sop.Ready;
+import sop.enums.InlineSignAs;
+import sop.exception.SOPGPException;
+import sop.external.ExternalSOP;
+import sop.operation.InlineSign;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Properties;
+
+public class InlineSignExternal implements InlineSign {
+
+    private final List<String> commandList = new ArrayList<>();
+    private final List<String> envList;
+
+    private int keyCounter = 0;
+    private int withKeyPasswordCounter = 0;
+
+    public InlineSignExternal(String binary, Properties environment) {
+        commandList.add(binary);
+        commandList.add("inline-sign");
+        envList = ExternalSOP.propertiesToEnv(environment);
+    }
+
+    @Override
+    public InlineSign noArmor() {
+        commandList.add("--no-armor");
+        return this;
+    }
+
+    @Override
+    public InlineSign key(InputStream key) throws SOPGPException.KeyCannotSign, SOPGPException.BadData, SOPGPException.UnsupportedAsymmetricAlgo, IOException {
+        String envVar = "KEY_" + keyCounter++;
+        commandList.add("@ENV:" + envVar);
+        envList.add(envVar + "=" + ExternalSOP.readFully(key));
+        return this;
+    }
+
+    @Override
+    public InlineSign withKeyPassword(byte[] password) throws SOPGPException.UnsupportedOption, SOPGPException.PasswordNotHumanReadable {
+        String envVar = "WITH_KEY_PASSWORD_" + withKeyPasswordCounter++;
+        commandList.add("--with-key-password=@ENV:" + envVar);
+        envList.add(envVar + "=" + new String(password));
+        return this;
+    }
+
+    @Override
+    public InlineSign mode(InlineSignAs mode) throws SOPGPException.UnsupportedOption {
+        commandList.add("--as=" + mode);
+        return this;
+    }
+
+    @Override
+    public Ready data(InputStream data) throws IOException, SOPGPException.KeyIsProtected, SOPGPException.ExpectedText {
+        return ExternalSOP.ready(Runtime.getRuntime(), commandList, envList, data);
+    }
+}