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71 lines
2.8 KiB
ReStructuredText
71 lines
2.8 KiB
ReStructuredText
======================
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Linking External Sites
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======================
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You can embed external websites or documents inside your Nextcloud pages with the External
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sites app, as this screenshot shows.
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.. figure:: ../images/external-sites-1.png
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:scale: 70%
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*Click to enlarge*
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This is useful for quick access to important pages such as the
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Nextcloud manuals and informational pages for your company, and for presenting
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external pages inside your custom Nextcloud branding, if you use your own custom
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themes.
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The External sites app is included in all versions of Nextcloud. Go to **Settings > Apps >
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Disabled apps** to enable it. Then go to your Nextcloud **Settings > Admin > Additional
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settings** to create your links, which are saved automatically.
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Each link can have a unique icon, icons are currently loaded from ``apps/external/img/``.
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If you select a language, the link will only be displayed for users with the selected language.
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This allows you to have different documentation links for users depending on their language.
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It is also possible to add links for a special device (recognized by the user agent).
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Currently the following options are available: All devices, Android app, iOS app, Desktop client and all others (Browsers).
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Hover your cursor over a row to make the trashcan icon appear when you
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want to remove them.
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.. figure:: ../images/external-sites-2.png
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:scale: 80%
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*Click to enlarge*
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The links appear in the Nextcloud menu on the top or in the settings menu, after
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reloading the page.
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.. figure:: ../images/external-sites-3.png
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Configurations preventing embedding
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-----------------------------------
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Your links may or may not work correctly due to the various ways that Web
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browsers and Web sites handle HTTP and HTTPS URLs, and because the External
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Sites app embeds external links in IFrames. Modern Web browsers try very hard
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to protect Web surfers from dangerous links, and safety apps like
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`Privacy Badger <https://www.eff.org/privacybadger>`_ and ad-blockers may block
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embedded pages. It is strongly recommended to enforce HTTPS on your Nextcloud
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server; do not weaken this, or any of your security tools, just to make
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embedded Web pages work. After all, you can freely access them outside of
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Nextcloud.
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Most Web sites that offer login functionalities use the ``X-Frame-Options`` or
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``Content-Security-Policy`` HTTP header which instructs browsers to not
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allow their pages to be embedded for security reasons (e.g. "Clickjacking"). You
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can usually verify the reason why embedding the website is not possible by using
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your browser's console tool. For example, this page has an invalid SSL
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certificate.
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.. figure:: ../images/external-sites-4.png
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On this page, X-Frame-Options prevents the embedding.
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.. figure:: ../images/external-sites-5.png
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There isn't much you can do about these issues, but if you're curious you can
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see what is happening.
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