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helm-external-secrets
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<h1 id="rewriting-keys-in-datafrom">Rewriting Keys in DataFrom</h1>
<p>When calling out an ExternalSecret with <code>dataFrom.extract</code> or <code>dataFrom.find</code>, it is possible that you end up with a kubernetes secret that has conflicts in the key names, or that you simply want to remove a common path from the secret keys.</p>
<p>In order to do so, it is possible to define a set of rewrite operations using <code>dataFrom.rewrite</code>. These operations can be stacked, hence allowing complex manipulations of the secret keys.</p>
<p>Rewrite operations are all applied before <code>ConversionStrategy</code> is applied.</p>
<h2 id="methods">Methods</h2>
<h3 id="regexp">Regexp</h3>
<p>This method implements rewriting through the use of regular expressions. It needs a <code>source</code> and a <code>target</code> field. The source field is where the definition of the matching regular expression goes, where the <code>target</code> field is where the replacing expression goes.</p>
<p>Some considerations about the implementation of Regexp Rewrite:</p>
<ol>
<li>The input of a subsequent rewrite operation are the outputs of the previous rewrite.</li>
<li>If a given set of keys do not match any Rewrite operation, there will be no error. Rather, the original keys will be used.</li>
<li>If a <code>source</code> is not a compilable <code>regexp</code> expression, an error will be produced and the external secret goes into a error state.</li>
</ol>
<h2 id="examples">Examples</h2>
<h3 id="removing-a-common-path-from-find-operations">Removing a common path from find operations</h3>
<p>The following ExternalSecret:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1beta1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span><span class="w"></span>
<span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span><span class="w"></span>
<span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">refreshInterval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1h</span><span class="w"></span>
<span class="w">  </span><span class="nt">secretStoreRef</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretStore</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">backend</span><span class="w"></span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span><span class="w"></span>
<span class="w">  </span><span class="nt">dataFrom</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">find</span><span class="p">:</span><span class="w"></span>
<span class="w">      </span><span class="nt">path</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">path/to/my</span><span class="w"></span>
<span class="w">      </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span>
<span class="w">        </span><span class="nt">regexp</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secrets</span><span class="w"></span>
<span class="w">    </span><span class="nt">rewrite</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">regexp</span><span class="p">:</span><span class="w"></span>
<span class="w">        </span><span class="nt">source</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;path/to/my/secrets/(.*)&quot;</span><span class="w"></span>
<span class="w">        </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;$1&quot;</span><span class="w"></span>
</code></pre></div>
Will get all the secrets matching <code>path/to/my/secrets/*</code> and then rewrite them by removing the common path away.</p>
<p>In this example, if we had the following secrets available in the provider:
<div class="highlight"><pre><span></span><code>path/to/my/secrets/username
path/to/my/secrets/password
</code></pre></div>
the output kubernetes secret would be:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Secret</span><span class="w"></span>
<span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Opaque</span><span class="w"></span>
<span class="nt">data</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">username</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span>
<span class="w">    </span><span class="nt">password</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span><span class="w"></span>
</code></pre></div></p>
<h3 id="avoiding-key-collisions">Avoiding key collisions</h3>
<p>The following ExternalSecret:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1beta1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span><span class="w"></span>
<span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span><span class="w"></span>
<span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">refreshInterval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1h</span><span class="w"></span>
<span class="w">  </span><span class="nt">secretStoreRef</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretStore</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">backend</span><span class="w"></span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span><span class="w"></span>
<span class="w">  </span><span class="nt">dataFrom</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">extract</span><span class="p">:</span><span class="w"></span>
<span class="w">      </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my-secrets-dev</span><span class="w"></span>
<span class="w">    </span><span class="nt">rewrite</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">regexp</span><span class="p">:</span><span class="w"></span>
<span class="w">        </span><span class="nt">source</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;(.*)&quot;</span><span class="w"></span>
<span class="w">        </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;dev-$1&quot;</span><span class="w">      </span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">extract</span><span class="p">:</span><span class="w"></span>
<span class="w">      </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">my-secrets-prod</span><span class="w"></span>
<span class="w">    </span><span class="nt">rewrite</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">regexp</span><span class="p">:</span><span class="w"></span>
<span class="w">        </span><span class="nt">source</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;(.*)&quot;</span><span class="w"></span>
<span class="w">        </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;prod-$1&quot;</span><span class="w"></span>
</code></pre></div>
Will allow two secrets with the same JSON keys to be imported into a Kubernetes Secret without any conflict.
In this example, if we had the following secrets available in the provider:
<div class="highlight"><pre><span></span><code><span class="p">{</span><span class="w"></span>
<span class="w">    </span><span class="nt">&quot;my-secrets-dev&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;password&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;bar&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">     </span><span class="p">},</span><span class="w"></span>
<span class="w">    </span><span class="nt">&quot;my-secrets-prod&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;password&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;safebar&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">     </span><span class="p">}</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
the output kubernetes secret would be:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Secret</span><span class="w"></span>
<span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Opaque</span><span class="w"></span>
<span class="nt">data</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">dev_password</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">YmFy</span><span class="w"> </span><span class="c1">#bar</span><span class="w"></span>
<span class="w">    </span><span class="nt">prod_password</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">c2FmZWJhcg==</span><span class="w"> </span><span class="c1">#safebar</span><span class="w"></span>
</code></pre></div></p>
<h3 id="remove-invalid-characters">Remove invalid characters</h3>
<p>The following ExternalSecret:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">external-secrets.io/v1beta1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span><span class="w"></span>
<span class="nt">metadata</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">example</span><span class="w"></span>
<span class="nt">spec</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="nt">refreshInterval</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1h</span><span class="w"></span>
<span class="w">  </span><span class="nt">secretStoreRef</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">SecretStore</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">backend</span><span class="w"></span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">name</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">secret-to-be-created</span><span class="w"></span>
<span class="w">  </span><span class="nt">dataFrom</span><span class="p">:</span><span class="w"></span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">extract</span><span class="p">:</span><span class="w"></span>
<span class="w">      </span><span class="nt">key</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">development</span><span class="w"></span>
<span class="w">    </span><span class="nt">rewrite</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">regexp</span><span class="p">:</span><span class="w"></span>
<span class="w">        </span><span class="nt">source</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;[^a-zA-Z0-9</span><span class="nv"> </span><span class="s">-]&quot;</span><span class="w"></span>
<span class="w">        </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;_&quot;</span><span class="w"></span>
</code></pre></div>
Will remove invalid characters from the secret key.
In this example, if we had the following secrets available in the provider:
<div class="highlight"><pre><span></span><code><span class="p">{</span><span class="w"></span>
<span class="w">    </span><span class="nt">&quot;development&quot;</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;foo/bar&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;1111&quot;</span><span class="p">,</span><span class="w"></span>
<span class="w">        </span><span class="nt">&quot;foo$baz&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;2222&quot;</span><span class="w"></span>
<span class="w">    </span><span class="p">}</span><span class="w"></span>
<span class="p">}</span><span class="w"></span>
</code></pre></div>
the output kubernetes secret would be:
<div class="highlight"><pre><span></span><code><span class="nt">apiVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v1</span><span class="w"></span>
<span class="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Secret</span><span class="w"></span>
<span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Opaque</span><span class="w"></span>
<span class="nt">data</span><span class="p">:</span><span class="w"></span>
<span class="w">    </span><span class="nt">foo_bar</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">MTExMQ==</span><span class="w"> </span><span class="c1">#1111</span><span class="w"></span>
<span class="w">    </span><span class="nt">foo_baz</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">MjIyMg==</span><span class="w"> </span><span class="c1">#2222</span><span class="w"></span>
</code></pre></div></p>
<h2 id="limitations">Limitations</h2>
<p>Regexp Rewrite is based on golang <code>regexp</code>, which in turns implements <code>RE2</code> regexp language. There a a series of known limitations to this implementation, such as:</p>
<ul>
<li>Lack of ability to do lookaheads or lookbehinds;</li>
<li>Lack of negation expressions;</li>
<li>Lack of support for conditional branches;</li>
<li>Lack of support for possessive repetitions.</li>
</ul>
<p>A list of compatibility and known limitations considering other commonly used regexp frameworks (such as PCRE and PERL) are listed <a href="https://github.com/google/re2/wiki/Syntax">here</a>.</p>

              
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