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| <div class="post-header"> |
| <h1 class="post-title-main">Namespaces and Names</h1> |
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| <p>Ditto uses namespaces and names for the IDs of important entity types like Things or Policies. Due to the fact that those |
| IDs often need to be set in the path of HTTP requests, we have restricted the set of allowed characters.</p> |
| |
| <h2 id="namespace">Namespace</h2> |
| |
| <p>The namespace must conform to the following notation:</p> |
| <ul> |
| <li>must start with a lower- or uppercase character from a-z</li> |
| <li>may use dots (<code class="highlighter-rouge">.</code>) to separate characters</li> |
| <li>a dot must be followed by a lower- or uppercase character from a-z</li> |
| <li>numbers may be used</li> |
| <li>underscore may be used</li> |
| </ul> |
| |
| <p>When writing a Java application, you can use the following regex to validate your namespaces: <br /> |
| <code class="highlighter-rouge">(?<ns>|(?:(?:[a-zA-Z]\w*+)(?:\.[a-zA-Z]\w*+)*+))</code> |
| (see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java#L42">RegexPatterns#NAMESPACE_REGEX</a>).</p> |
| |
| <p>Examples for valid namespaces:</p> |
| <ul> |
| <li><code class="highlighter-rouge">org.eclipse.ditto</code>,</li> |
| <li><code class="highlighter-rouge">com.google</code>,</li> |
| <li><code class="highlighter-rouge">foo.bar_42</code></li> |
| </ul> |
| |
| <h2 id="name">Name</h2> |
| |
| <p>The name must conform to the following notation:</p> |
| <ul> |
| <li>may not be empty</li> |
| <li>may contain lower- and uppercase characters from a-z</li> |
| <li>numbers may be used</li> |
| <li>may contain hex encoded characters, e.g. <code class="highlighter-rouge">%3A</code>, <code class="highlighter-rouge">%4B</code></li> |
| <li>may also contain the characters: <code class="highlighter-rouge">-</code> (hyphen), <code class="highlighter-rouge">:</code> (colon), <code class="highlighter-rouge">@</code> (at sign), <code class="highlighter-rouge">&</code> (ampersand), <code class="highlighter-rouge">=</code> (equals sign), |
| <code class="highlighter-rouge">+</code> (plus sign), <code class="highlighter-rouge">,</code> (comma), <code class="highlighter-rouge">.</code> (period), <code class="highlighter-rouge">!</code> (exclamation mark), <code class="highlighter-rouge">~</code> (tilde), <code class="highlighter-rouge">*</code> (asterisk), <code class="highlighter-rouge">'</code> (apostrophe), |
| <code class="highlighter-rouge">_</code> (underscore), <code class="highlighter-rouge">;</code> (semicolon), <code class="highlighter-rouge"><</code> (less-than sign), <code class="highlighter-rouge">></code> (greater-than sign), <code class="highlighter-rouge">$</code> (dollar sign)</li> |
| <li>may not start with <code class="highlighter-rouge">$</code> (dollar sign)</li> |
| </ul> |
| |
| <p>When writing a Java application, you can use the following regex to validate your namespaces: <br /> |
| <code class="highlighter-rouge">(?<name>(?:[-\w:@&=+,.!~*'_;<>]|%\p{XDigit}{2})(?:[-\w:@&=+,.!~*'_;<>$]|%\p{XDigit}{2})*+)</code> |
| (see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java#L85">RegexPatterns#ENTITY_NAME_REGEX</a>).</p> |
| |
| <p>Examples for valid names: |
| * <code class="highlighter-rouge">ditto</code>, |
| * <code class="highlighter-rouge">smart-coffee-1</code>, |
| * <code class="highlighter-rouge">foo%2Fbar</code></p> |
| |
| <h2 id="namespaced-id">Namespaced ID</h2> |
| |
| <p>A namespaced ID must conform to the following expectations:</p> |
| <ul> |
| <li>namespace and name separated by a <code class="highlighter-rouge">:</code> (colon)</li> |
| <li>have a maximum length of 256 characters</li> |
| </ul> |
| |
| <p>When writing a Java application, you can use the following regex to validate your namespaced IDs: <br /> |
| <code class="highlighter-rouge">(?<ns>|(?:(?:[a-zA-Z]\w*+)(?:\.[a-zA-Z]\w*+)*+)):(?<name>(?:[-\w:@&=+,.!~*'_;<>]|%\p{XDigit}{2})(?:[-\w:@&=+,.!~*'_;<>$]|%\p{XDigit}{2})*+)</code> |
| (see <a href="https://github.com/eclipse/ditto/blob/master/model/base/src/main/java/org/eclipse/ditto/model/base/entity/id/RegexPatterns.java#L92">RegexPatterns#ID_REGEX</a>).</p> |
| |
| <p>Examples for valid IDs:</p> |
| <ul> |
| <li><code class="highlighter-rouge">org.eclipse.ditto:smart-coffee-1</code>,</li> |
| <li><code class="highlighter-rouge">foo:bar</code>,</li> |
| <li><code class="highlighter-rouge">org.eclipse.ditto_42:smart-coffeee</code></li> |
| <li><code class="highlighter-rouge">org.eclipse:admin-policy</code></li> |
| </ul> |
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