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href="/docs/category/community">Community</a><button aria-label="Toggle the collapsible sidebar category 'Community'" type="button" class="clean-btn menu__caret"></button></div></li><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class="menu__list-item-collapsible"><a class="menu__link menu__link--sublist menu__link--sublist-caret" aria-expanded="false" href="/docs/releases">Release History</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Developing on DataHub</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Modules</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">datahub-frontend</span><meta itemprop="position" content="3"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>DataHub Frontend Proxy</h1><p>DataHub frontend is a <a href="https://www.playframework.com/" target="_blank" rel="noopener noreferrer">Play</a> service written in Java. It is served as a mid-tier
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between <a href="https://github.com/datahub-project/datahub/blob/master/metadata-service" target="_blank" rel="noopener noreferrer">DataHub GMS</a> which is the backend service and <a href="/docs/datahub-web-react">DataHub Web</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="pre-requisites">Pre-requisites<a href="#pre-requisites" class="hash-link" aria-label="Direct link to Pre-requisites" title="Direct link to Pre-requisites"></a></h2><ul><li>You need to have <a href="https://openjdk.org/projects/jdk/11/" target="_blank" rel="noopener noreferrer">JDK11</a>
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installed on your machine to be able to build <code>DataHub Frontend</code>.</li><li>You need to have <a href="https://www.google.com/chrome/" target="_blank" rel="noopener noreferrer">Chrome</a> web browser
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installed to be able to build because UI tests have a dependency on <code>Google Chrome</code>.</li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="build">Build<a href="#build" class="hash-link" aria-label="Direct link to Build" title="Direct link to Build"></a></h2><p><code>DataHub Frontend</code> is already built as part of top level build:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew build</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>However, if you only want to build <code>DataHub Frontend</code> specifically:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">./gradlew :datahub-frontend:dist</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="dependencies">Dependencies<a href="#dependencies" class="hash-link" aria-label="Direct link to Dependencies" title="Direct link to Dependencies"></a></h2><p>Before starting <code>DataHub Frontend</code>, you need to make sure that <a href="https://github.com/datahub-project/datahub/blob/master/metadata-service" target="_blank" rel="noopener noreferrer">DataHub GMS</a> and
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all its dependencies have already started and running.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="start-via-docker-image">Start via Docker image<a href="#start-via-docker-image" class="hash-link" aria-label="Direct link to Start via Docker image" title="Direct link to Start via Docker image"></a></h2><p>Quickest way to try out <code>DataHub Frontend</code> is running the <a href="https://github.com/datahub-project/datahub/blob/master/docker/datahub-frontend" target="_blank" rel="noopener noreferrer">Docker image</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="start-via-command-line">Start via command line<a href="#start-via-command-line" class="hash-link" aria-label="Direct link to Start via command line" title="Direct link to Start via command line"></a></h2><p>If you do modify things and want to try it out quickly without building the Docker image, you can also run
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the application directly from command line after a successful <a href="#build">build</a>:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">cd datahub-frontend/run && ./run-local-frontend</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="checking-out-datahub-ui">Checking out DataHub UI<a href="#checking-out-datahub-ui" class="hash-link" aria-label="Direct link to Checking out DataHub UI" title="Direct link to Checking out DataHub UI"></a></h2><p>After starting your application in one of the two ways mentioned above, you can connect to it by typing below
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into your favorite web browser:</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">http://localhost:9002</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>To be able to sign in, you need to provide your user name. The default account is <code>datahub</code>, password <code>datahub</code>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="authentication">Authentication<a href="#authentication" class="hash-link" aria-label="Direct link to Authentication" title="Direct link to Authentication"></a></h2><p>DataHub frontend leverages <a href="https://docs.oracle.com/javase/7/docs/technotes/guides/security/jaas/JAASRefGuide.html" target="_blank" rel="noopener noreferrer">Java Authentication and Authorization Service (JAAS)</a> to perform the authentication. By default we provided a <a href="https://github.com/datahub-project/datahub/blob/master/datahub-frontend/app/security/DummyLoginModule.java" target="_blank" rel="noopener noreferrer">DummyLoginModule</a> which will accept any username/password combination. You can update <a href="https://github.com/datahub-project/datahub/blob/master/datahub-frontend/conf/jaas.conf" target="_blank" rel="noopener noreferrer">jaas.conf</a> to match your authentication requirement. For example, use the following config for LDAP-based authentication,</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">WHZ-Authentication {</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> com.sun.security.auth.module.LdapLoginModule sufficient</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> userProvider="ldaps://<host>:636/dc=<domain>"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> authIdentity="{USERNAME}"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> userFilter="(&(objectClass=person)(uid={USERNAME}))"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> java.naming.security.authentication="simple"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> debug="false"</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> useSSL="true";</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">};</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="authentication-in-react">Authentication in React<a href="#authentication-in-react" class="hash-link" aria-label="Direct link to Authentication in React" title="Direct link to Authentication in React"></a></h3><p>The React app supports both JAAS as described above and separately OIDC authentication. To learn about configuring OIDC for React,
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see the <a href="/docs/authentication/guides/sso/configure-oidc-react">OIDC in React</a> document.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="api-debugging">API Debugging<a href="#api-debugging" class="hash-link" aria-label="Direct link to API Debugging" title="Direct link to API Debugging"></a></h3><p>Most DataHub frontend API endpoints are protected using <a href="https://www.playframework.com/documentation/2.1.0/JavaGuide4" target="_blank" rel="noopener noreferrer">Play Authentication</a>, which means it requires authentication information stored in the cookie for the request to go through. This makes debugging using curl difficult. One option is to first make a curl call against the <code>/authenticate</code> endpoint and stores the authentication info in a cookie file like this</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">curl -c cookie.txt -d '{"username":"datahub", "password":"datahub"}' -H 'Content-Type: application/json' http://localhost:9002/authenticate</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>You can then make all subsequent calls using the same cookie file to pass the authentication check.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">curl -b cookie.txt "http://localhost:9001/api/v2/search?type=dataset&input=page"</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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