logic855
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helm-external-secrets
zrcadlo https://github.com/external-secrets/external-secrets


			
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<h1 id="advanced-templating-v2">Advanced Templating v2</h1>
<p>With External Secrets Operator you can transform the data from the external secret provider before it is stored as <code>Kind=Secret</code>. You can do this with the <code>Spec.Target.Template</code>. Each data value is interpreted as a <a href="https://golang.org/pkg/text/template/">golang template</a>.</p>
<h2 id="examples">Examples</h2>
<p>You can use templates to inject your secrets into a configuration file that you mount into your pod:</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">template</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</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="c1"># this is how the Kind=Secret will look like</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</span>
<span class="w">        </span><span class="c1"># multiline string</span>
<span class="w">        </span><span class="nt">config</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w">          </span><span class="no">datasources:</span>
<span class="w">          </span><span class="no">- name: Graphite</span>
<span class="w">            </span><span class="no">type: graphite</span>
<span class="w">            </span><span class="no">access: proxy</span>
<span class="w">            </span><span class="no">url: http://localhost:8080</span>
<span class="w">            </span><span class="no">password: &quot;{{ .password }}&quot;</span>
<span class="w">            </span><span class="no">user: &quot;{{ .user }}&quot;</span>
<span class="w">        </span><span class="c1"># using replace function to rewrite secret</span>
<span class="w">        </span><span class="nt">connection</span><span class="p">:</span><span class="w"> </span><span class="s">&#39;{{</span><span class="nv"> </span><span class="s">.dburl</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">replace</span><span class="nv"> </span><span class="s">&quot;postgres://&quot;</span><span class="nv"> </span><span class="s">&quot;postgresql://&quot;</span><span class="nv"> </span><span class="s">}}&#39;</span>

<span class="w">  </span><span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">user</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/user</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/password</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">dburl</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/database/url</span>
</code></pre></div>
<p>Another example with two keys in the same secret:</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">template</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</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">admin</span>
<span class="w">        </span><span class="nt">password</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.mysecret</span><span class="nv"> </span><span class="s">}}&quot;</span><span class="w">                   </span><span class="c1"># If you are using plain manifests or gitops tools</span>
<span class="w">        </span><span class="c1"># password: &#39;{{ printf &quot;{{ .mysecret }}&quot; }}&#39;  # If you are using templated tools like helm</span>
<span class="w">  </span><span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">mysecret</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/credentials</span>
</code></pre></div>
<h3 id="mergepolicy">MergePolicy</h3>
<p>By default, the templating mechanism will not use any information available from the original <code>data</code> and <code>dataFrom</code> queries to the provider, and only keep the templated information. It is possible to change this behavior through the use of the <code>mergePolicy</code> field. <code>mergePolicy</code> currently accepts two values: <code>Replace</code> (the default) and <code>Merge</code>. When using <code>Merge</code>, <code>data</code> and <code>dataFrom</code> keys will also be embedded into the templated secret, having lower priority than the template outcome. See the example for more information:</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">template</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">mergePolicy</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Merge</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</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">admin</span>
<span class="w">        </span><span class="nt">password</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.password</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">b64dec</span><span class="nv"> </span><span class="s">}}&quot;</span><span class="w"> </span><span class="c1"># Overwrites the password from the data call and use this output</span>
<span class="w">  </span><span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/credentials/password</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">username</span><span class="w"> </span><span class="c1"># Preserves the username in the templated Secret</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/credentials/username</span>
</code></pre></div>
<h3 id="templatefrom">TemplateFrom</h3>
<p>You do not have to define your templates inline in an ExternalSecret but you can pull <code>ConfigMaps</code> or other Secrets that contain a template. Consider the following example:</p>
<div class="highlight"><pre><span></span><code><span class="c1"># define your template in a config map</span>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ConfigMap</span>
<span class="nt">metadata</span><span class="p">:</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">grafana-config-tpl</span>
<span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="nt">config.yaml</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w">    </span><span class="no">datasources:</span>
<span class="w">      </span><span class="no">- name: Graphite</span>
<span class="w">        </span><span class="no">type: graphite</span>
<span class="w">        </span><span class="no">access: proxy</span>
<span class="w">        </span><span class="no">url: &quot;{{ .uri }}&quot;</span>
<span class="w">        </span><span class="no">password: &quot;{{ .password }}&quot;</span>
<span class="w">        </span><span class="no">user: &quot;{{ .user }}&quot;</span>
<span class="w">  </span><span class="nt">templated</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w">     </span><span class="no"># key and value templated</span>
<span class="w">     </span><span class="no">my-application-{{ .user}}: {{ .password | b64enc }}</span>
<span class="w">     </span><span class="no"># conditional keys</span>
<span class="w">     </span><span class="no">{{- if hasPrefix &quot;oci://&quot; .uri }}</span>
<span class="w">     </span><span class="no">enableOCI: true</span>
<span class="w">     </span><span class="no">{{- else }}</span>
<span class="w">     </span><span class="no">enableOCI: false</span>
<span class="w">     </span><span class="no">{{- end }}</span>
<span class="w">     </span><span class="no"># Fixed values</span>
<span class="w">     </span><span class="no">application-type: grafana</span>
<span class="w">  </span><span class="nt">annotations</span><span class="p">:</span><span class="w"> </span><span class="p p-Indicator">|</span>
<span class="w">     </span><span class="no">#dynamic timestamp generation</span>
<span class="w">     </span><span class="no">last-synced-for-user/{{ .user }}: {{ now }}</span>
<span class="nn">---</span>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">my-template-example</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</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="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">templateFrom</span><span class="p">:</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Data</span>
<span class="w">        </span><span class="nt">configMap</span><span class="p">:</span>
<span class="w">          </span><span class="c1"># name of the configmap to pull in</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">grafana-config-tpl</span>
<span class="w">          </span><span class="c1"># here you define the keys that should be used as template</span>
<span class="w">          </span><span class="nt">items</span><span class="p">:</span>
<span class="w">          </span><span class="p p-Indicator">-</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">config.yaml</span>
<span class="w">            </span><span class="nt">templateAs</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Values</span>
<span class="w">          </span><span class="p p-Indicator">-</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">generated</span>
<span class="w">            </span><span class="nt">templateAs</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">KeysAndValues</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Annotations</span>
<span class="w">        </span><span class="nt">configMap</span><span class="p">:</span>
<span class="w">          </span><span class="c1"># name of the configmap to pull in</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">grafana-config-tpl</span>
<span class="w">          </span><span class="c1"># here you define the keys that should be used as template</span>
<span class="w">          </span><span class="nt">items</span><span class="p">:</span>
<span class="w">          </span><span class="p p-Indicator">-</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">annotations</span>
<span class="w">            </span><span class="nt">templateAs</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">KeysAndValues</span>
<span class="w">  </span><span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">user</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/user</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/password</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">uri</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/uri</span>
</code></pre></div>
<p><code>TemplateFrom</code> also gives you the ability to Target your template to the Secret's Annotations, Labels or the Data block. It also allows you to render the templated information as <code>Values</code> or as <code>KeysAndValues</code> through the <code>templateAs</code> configuration:</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">my-template-example</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</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="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">templateFrom</span><span class="p">:</span>
<span class="w">      </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">target</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">Annotations</span>
<span class="w">        </span><span class="nt">literal</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;last-sync-for-user/{{</span><span class="nv"> </span><span class="s">.user</span><span class="nv"> </span><span class="s">}}:</span><span class="nv"> </span><span class="s">{{</span><span class="nv"> </span><span class="s">.now</span><span class="nv"> </span><span class="s">}}&quot;</span>
<span class="w">  </span><span class="nt">data</span><span class="p">:</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">user</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/user</span>
<span class="w">  </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="nt">secretKey</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">password</span>
<span class="w">    </span><span class="nt">remoteRef</span><span class="p">:</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">/grafana/password</span>
</code></pre></div>
<p>Lastly, <code>TemplateFrom</code> also supports adding <code>Literal</code> blocks for quick templating. These <code>Literal</code> blocks differ from <code>Template.Data</code> as they are rendered as a a <code>key:value</code> pair (while the <code>Template.Data</code>, you can only template the value).</p>
<h3 id="extract-keys-and-certificates-from-pkcs12-archive">Extract Keys and Certificates from PKCS#12 Archive</h3>
<p>You can use pre-defined functions to extract data from your secrets. Here: extract keys and certificates from a PKCS#12 archive and store it as PEM.</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">template</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</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">kubernetes.io/tls</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</span>
<span class="w">        </span><span class="nt">tls.crt</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.mysecret</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">pkcs12cert</span><span class="nv"> </span><span class="s">}}&quot;</span>
<span class="w">        </span><span class="nt">tls.key</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.mysecret</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">pkcs12key</span><span class="nv"> </span><span class="s">}}&quot;</span>

<span class="w">        </span><span class="c1"># if needed unlock the pkcs12 with the password</span>
<span class="w">        </span><span class="nt">tls.crt</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.mysecret</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">pkcs12certPass</span><span class="nv"> </span><span class="s">&quot;</span><span class="l l-Scalar l-Scalar-Plain">my-password&quot; }}&quot;</span>
</code></pre></div>
<h3 id="extract-from-jwk">Extract from JWK</h3>
<p>You can extract the public or private key parts of a JWK and use them as <a href="https://pkg.go.dev/crypto/x509#ParsePKCS8PrivateKey">PKCS#8</a> private key or PEM-encoded <a href="https://pkg.go.dev/crypto/x509#MarshalPKIXPublicKey">PKIX</a> public key.</p>
<p>A JWK looks similar to this:</p>
<div class="highlight"><pre><span></span><code><span class="p">{</span>
<span class="w">  </span><span class="nt">&quot;kty&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;RSA&quot;</span><span class="p">,</span>
<span class="w">  </span><span class="nt">&quot;kid&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;cc34c0a0-bd5a-4a3c-a50d-a2a7db7643df&quot;</span><span class="p">,</span>
<span class="w">  </span><span class="nt">&quot;use&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;sig&quot;</span><span class="p">,</span>
<span class="w">  </span><span class="nt">&quot;n&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;pjdss...&quot;</span><span class="p">,</span>
<span class="w">  </span><span class="nt">&quot;e&quot;</span><span class="p">:</span><span class="w"> </span><span class="s2">&quot;AQAB&quot;</span>
<span class="w">  </span><span class="c1">// ...</span>
<span class="p">}</span>
</code></pre></div>
<p>And what you want may be a PEM-encoded public or private key portion of it. Take a look at this example on how to transform it into the desired format:</p>
<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="nt">kind</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">ExternalSecret</span>
<span class="nt">metadata</span><span class="p">:</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">template</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</span>
<span class="w">        </span><span class="c1"># .myjwk is a json-encoded JWK string.</span>
<span class="w">        </span><span class="c1">#</span>
<span class="w">        </span><span class="c1"># this template will produce for jwk_pub a PEM encoded public key:</span>
<span class="w">        </span><span class="c1"># -----BEGIN PUBLIC KEY-----</span>
<span class="w">        </span><span class="c1"># MIIBI...</span>
<span class="w">        </span><span class="c1"># ...</span>
<span class="w">        </span><span class="c1"># ...AQAB</span>
<span class="w">        </span><span class="c1"># -----END PUBLIC KEY-----</span>
<span class="w">        </span><span class="nt">jwk_pub</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.myjwk</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">jwkPublicKeyPem</span><span class="nv"> </span><span class="s">}}&quot;</span>
<span class="w">        </span><span class="c1"># private key is a pem-encoded PKCS#8 private key</span>
<span class="w">        </span><span class="nt">jwk_priv</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;{{</span><span class="nv"> </span><span class="s">.myjwk</span><span class="nv"> </span><span class="s">|</span><span class="nv"> </span><span class="s">jwkPrivateKeyPem</span><span class="nv"> </span><span class="s">}}&quot;</span>
</code></pre></div>
<h3 id="filter-pem-blocks">Filter PEM blocks</h3>
<p>Consider you have a secret that contains both a certificate and a private key encoded in PEM format and it is your goal to use only the certificate from that secret.</p>
<div class="highlight"><pre><span></span><code>-----BEGIN PRIVATE KEY-----
MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCvxGZOW4IXvGlh
 . . .
m8JCpbJXDfSSVxKHgK1Siw4K6pnTsIA2e/Z+Ha2fvtocERjq7VQMAJFaIZSTKo9Q
JwwY+vj0yxWjyzHUzZB33tg=
-----END PRIVATE KEY-----
-----BEGIN CERTIFICATE-----
MIIDMDCCAhigAwIBAgIQabPaXuZCQaCg+eQAVptGGDANBgkqhkiG9w0BAQsFADAV
 . . .
NtFUGA95RGN9s+pl6XY0YARPHf5O76ErC1OZtDTR5RdyQfcM+94gYZsexsXl0aQO
9YD3Wg==
-----END CERTIFICATE-----
</code></pre></div>
<p>You can achieve that by using the <code>filterPEM</code> function to extract a specific type of PEM block from that secret. If multiple blocks of that type (here: <code>CERTIFICATE</code>) exist then all of them are returned in the order they are specified.</p>
<h2 id="helper-functions">Helper functions</h2>
<div class="admonition info inline end">
<p class="admonition-title">Info</p>
<p>Note: we removed <code>env</code> and <code>expandenv</code> from sprig functions for security reasons.</p>
</div>
<p>We provide a couple of convenience functions that help you transform your secrets. This is useful when dealing with PKCS#12 archives or JSON Web Keys (JWK).</p>
<p>In addition to that you can use over 200+ <a href="http://masterminds.github.io/sprig/">sprig functions</a>. If you feel a function is missing or might be valuable feel free to open an issue and submit a <a href="../../contributing/process/#submitting-a-pull-request">pull request</a>.</p>
<p><br/></p>
<table>
<thead>
<tr>
<th>Function</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>pkcs12key</td>
<td>Extracts all private keys from a PKCS#12 archive and encodes them in <strong>PKCS#8 PEM</strong> format.</td>
</tr>
<tr>
<td>pkcs12keyPass</td>
<td>Same as <code>pkcs12key</code>. Uses the provided password to decrypt the PKCS#12 archive.</td>
</tr>
<tr>
<td>pkcs12cert</td>
<td>Extracts all certificates from a PKCS#12 archive and orders them if possible. If disjunct or multiple leaf certs are provided they are returned as-is. <br/> Sort order: <code>leaf / intermediate(s) / root</code>.</td>
</tr>
<tr>
<td>pkcs12certPass</td>
<td>Same as <code>pkcs12cert</code>. Uses the provided password to decrypt the PKCS#12 archive.</td>
</tr>
<tr>
<td>filterPEM</td>
<td>Filters PEM blocks with a specific type from a list of PEM blocks.</td>
</tr>
<tr>
<td>jwkPublicKeyPem</td>
<td>Takes an json-serialized JWK and returns an PEM block of type <code>PUBLIC KEY</code> that contains the public key. <a href="https://golang.org/pkg/crypto/x509/#MarshalPKIXPublicKey">See here</a> for details.</td>
</tr>
<tr>
<td>jwkPrivateKeyPem</td>
<td>Takes an json-serialized JWK as <code>string</code> and returns an PEM block of type <code>PRIVATE KEY</code> that contains the private key in PKCS #8 format. <a href="https://golang.org/pkg/crypto/x509/#MarshalPKCS8PrivateKey">See here</a> for details.</td>
</tr>
<tr>
<td>toYaml</td>
<td>Takes an interface, marshals it to yaml. It returns a string, even on marshal error (empty string).</td>
</tr>
<tr>
<td>fromYaml</td>
<td>Function converts a YAML document into a map[string]interface{}.</td>
</tr>
</tbody>
</table>
<h2 id="migrating-from-v1">Migrating from v1</h2>
<p>If you are still using <code>v1alpha1</code>, You have to opt-in to use the new engine version by specifying <code>template.engineVersion=v2</code>:</p>
<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/v1alpha1</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="nt">metadata</span><span class="p">:</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</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="c1"># ...</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">  </span><span class="c1"># ...</span>
</code></pre></div>
<p>The biggest change was that basically all function parameter types were changed from accepting/returning <code>[]byte</code> to <code>string</code>. This is relevant for you because now you don't need to specify <code>toString</code> all the time at the end of a template pipeline.</p>
<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/v1alpha1</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="c1"># ...</span>
<span class="nt">spec</span><span class="p">:</span>
<span class="w">  </span><span class="nt">target</span><span class="p">:</span>
<span class="w">    </span><span class="nt">template</span><span class="p">:</span>
<span class="w">      </span><span class="nt">engineVersion</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">v2</span>
<span class="w">      </span><span class="nt">data</span><span class="p">:</span>
<span class="w">        </span><span class="c1"># this used to be {{ .foobar | toString }}</span>
<span class="w">        </span><span class="nt">egg</span><span class="p">:</span><span class="w"> </span><span class="s">&quot;new:</span><span class="nv"> </span><span class="s">{{</span><span class="nv"> </span><span class="s">.foobar</span><span class="nv"> </span><span class="s">}}&quot;</span>
</code></pre></div>
<h5 id="functions-removedreplaced">Functions removed/replaced</h5>
<ul>
<li><code>base64encode</code> was renamed to <code>b64enc</code>.</li>
<li><code>base64decode</code> was renamed to <code>b64dec</code>. Any errors that occur during decoding are silenced.</li>
<li><code>fromJSON</code> was renamed to <code>fromJson</code>. Any errors that occur during unmarshalling are silenced.</li>
<li><code>toJSON</code> was renamed to <code>toJson</code>. Any errors that occur during marshalling are silenced.</li>
<li><code>pkcs12key</code> and <code>pkcs12keyPass</code> encode the PKCS#8 key directly into PEM format. There is no need to call <code>pemPrivateKey</code> anymore. Also, these functions do extract all private keys from the PKCS#12 archive not just the first one.</li>
<li><code>pkcs12cert</code> and <code>pkcs12certPass</code> encode the certs directly into PEM format. There is no need to call <code>pemCertificate</code> anymore. These functions now <strong>extract all certificates</strong> from the PKCS#12 archive not just the first one.</li>
<li><code>toString</code> implementation was replaced by the <code>sprig</code> implementation and should be api-compatible.</li>
<li><code>toBytes</code> was removed.</li>
<li><code>pemPrivateKey</code> was removed. It's now implemented within the <code>pkcs12*</code> functions.</li>
<li><code>pemCertificate</code> was removed. It's now implemented within the <code>pkcs12*</code> functions.</li>
</ul>


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