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53 lines
2.1 KiB
Markdown
53 lines
2.1 KiB
Markdown
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SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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SPDX-License-Identifier: Apache-2.0
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-->
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# External-SOP
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Access an external SOP binary from within your Java/Kotlin application.
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This module implements a backend for `sop-java` that binds to external SOP binaries (such as
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[sqop](https://gitlab.com/sequoia-pgp/sequoia-sop/), [python-sop](https://pypi.org/project/sop/) etc.).
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SOP operation calls will be delegated to the external binary, and the results are parsed back, so that you can
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access them from your Java application as usual.
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## Example
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Let's say you are using `ExampleSOP` which is a binary installed in `/usr/bin/example-sop`.
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Instantiating a `SOP` object is as simple as this:
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```java
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SOP sop = new ExternalSOP("/usr/bin/example-sop");
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```
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This SOP object can now be used as usual (see [here](../sop-java/README.md)).
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Some SOP binaries might require additional configuration, e.g. a Java based SOP might need to know which JAVA_HOME to use.
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For this purpose, additional environment variables can be passed in using a `Properties` object:
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```java
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Properties properties = new Properties();
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properties.put("JAVA_HOME", "/usr/lib/jvm/[...]");
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SOP sop = new ExternalSOP("/usr/bin/example-sop", properties);
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```
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Most results of SOP operations are communicated via standard-out, standard-in. However, some operations rely on
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writing results to additional output files.
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To handle such results, we need to provide a temporary directory, to which those results can be written by the SOP,
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and from which `External-SOP` reads them back.
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The default implementation relies on `Files.createTempDirectory()` to provide a temporary directory.
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It is however possible to overwrite this behavior, in order to specify a custom, perhaps more private directory:
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```java
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ExternalSOP.TempDirProvider provider = new ExternalSOP.TempDirProvider() {
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@Override
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public File provideTempDirectory() throws IOException {
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File myTempDir = new File("/path/to/directory");
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myTempDir.mkdirs();
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return myTempDir;
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}
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};
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SOP sop = new ExternalSOP("/usr/bin/example-sop", provider);
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```
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