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href="https://www.paypal.com/donate/?business=E8JMYD2LQ8MMA&amp;no_recurring=0&amp;item_name=I+rely+on+donations+to+maintain+and+improve+the+Joplin+open+source+project.+Thank+you+for+your+help+-+it+makes+a+difference%21&amp;currency_code=EUR" target="_blank" rel="noopener noreferrer"><img loading="lazy" src="https://raw.githubusercontent.com/laurent22/joplin/dev/Assets/WebsiteAssets/images/badges/Donate-PayPal-green.svg" alt="Donate using PayPal" class="img_ev3q"></a> <a href="https://github.com/sponsors/laurent22/" target="_blank" rel="noopener noreferrer"><img loading="lazy" src="https://raw.githubusercontent.com/laurent22/joplin/dev/Assets/WebsiteAssets/images/badges/GitHub-Badge.svg" alt="Sponsor on GitHub" class="img_ev3q"></a> <a href="https://www.patreon.com/joplin" target="_blank" rel="noopener noreferrer"><img loading="lazy" src="https://raw.githubusercontent.com/laurent22/joplin/dev/Assets/WebsiteAssets/images/badges/Patreon-Badge.svg" alt="Become a patron" class="img_ev3q"></a> <a href="https://joplinapp.org/donate/#donations" target="_blank" rel="noopener noreferrer"><img loading="lazy" src="https://raw.githubusercontent.com/laurent22/joplin/dev/Assets/WebsiteAssets/images/badges/Donate-IBAN.svg" alt="Donate using IBAN" class="img_ev3q"></a></p></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="sharing-a-notebook-with-a-user">Sharing a notebook with a user<a href="#sharing-a-notebook-with-a-user" class="hash-link" aria-label="Direct link to Sharing a notebook with a user" title="Direct link to Sharing a notebook with a user"></a></h2><p>Sharing a notebook is done via synchronisation using the following API objects:</p><ul><li><code>item</code>: any Joplin item such as a note or notebook.</li><li><code>user_item</code>: owned by a user and points to an item. Multiple user_items can point to the same item, which is important to enable sharing.</li><li><code>share</code>: associated with a notebook ID, it specifies which notebook should be shared and by whom</li><li><code>share_user</code>: associated with share and a user. This is essentially an invitation that the sharer sent to recipients. There can be multiple such objects, and they can be accepted or rejected by the recipient.</li></ul><p>The process to share is then:</p><ul><li>First, the sharer calls <code>POST /api/shares</code> with the notebook ID that needs to be shared.</li><li>Then invitations can be sent by calling <code>POST /api/share_users</code> and providing the share ID and recipient email.</li><li>The recipient accept or reject the application by setting the status on the <code>share_users</code> object (which corresponds to an invitation).</li></ul><p>Once share is setup, the client recursively goes through all notes, sub-notebooks and resources within the shared notebook, and set their <code>share_id</code> property. Basically any item within the notebook should have this property set. Then all these items are synchronized.</p><p>On the server, a service is running at regular interval to check the <code>share_id</code> property, and generate <code>user_item</code> objects for each recipient. Once these objects have been created, the recipient will start receiving the shared notebooks and notes.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="why-is-the-share_id-set-on-the-client-and-not-the-server">Why is the share_id set on the client and not the server?<a href="#why-is-the-share_id-set-on-the-client-and-not-the-server" class="hash-link" aria-label="Direct link to Why is the share_id set on the client and not the server?" title="Direct link to Why is the share_id set on the client and not the server?"></a></h3><p>Technically, the server would only need to know the root shared folder, and from that can be find out its children. This approach was tried but it makes the system much more complex because some information is lost after sync - in particular when notes or notebooks are moved out of folders, when resources are attached or removed, etc. Keeping track of all this is possible but complex and inefficient.</p><p>On the other hand, all that information is present on the client. Whenever a notes is moved out a shared folder, or whenever a resources is attached, the changes are tracked, and that can be used to easily assign a <code>share_id</code> property. Once this is set, it makes the whole system more simple and reliable.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="publishing-a-note-via-a-public-url">Publishing a note via a public URL<a href="#publishing-a-note-via-a-public-url" class="hash-link" aria-label="Direct link to Publishing a note via a public URL" title="Direct link to Publishing a note via a public URL"></a></h2><p>This is done by posting a note ID to <code>/api/shares</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="attached-resources">Attached resources<a href="#attached-resources" class="hash-link" aria-label="Direct link to Attached resources" title="Direct link to Attached resources"></a></h3><p>Any resource attached to the note is also shared - so for example images will be displayed, and it will be possible to open any attached PDF.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="linked-note">Linked note<a href="#linked-note" class="hash-link" aria-label="Direct link to Linked note" title="Direct link to Linked note"></a></h3><p>Any linked note will <strong>not</strong> be shared, due to the following reasons:</p><ul><li>Privacy issue - you don&#x27;t want to accidentally share a note just because it was linked from another note.</li><li>Even if the linked note has been shared separately, we still don&#x27;t give access to it. We don&#x27;t know who that link has been shared with - it could be a different recipient.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="multiple-share-links-for-a-given-note">Multiple share links for a given note<a href="#multiple-share-links-for-a-given-note" class="hash-link" aria-label="Direct link to Multiple share links for a given note" title="Direct link to Multiple share links for a given note"></a></h3><p>It should be possible to have multiple share links for a given note. For example: I share a note with one person, then the same note with a different person. I revoke the share for one person, but I sill want the other person to access the note.</p><p>So when a share link is created for a note, the API always returns a new link.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/laurent22/joplin/tree/dev/readme/dev/spec/server_sharing.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/help/dev/spec/server_items"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Joplin Server items</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/help/dev/spec/server_sharing_e2ee"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Sharing a notebook with E2EE enabled</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#sharing-a-notebook-with-a-user" class="table-of-contents__link toc-highlight">Sharing a notebook with a user</a><ul><li><a href="#why-is-the-share_id-set-on-the-client-and-not-the-server" class="table-of-contents__link toc-highlight">Why is the share_id set on the client and not the server?</a></li></ul></li><li><a href="#publishing-a-note-via-a-public-url" class="table-of-contents__link toc-highlight">Publishing a note via a public URL</a><ul><li><a 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