Feature: Share links (#3996)

* Implement share links

Basic implementation of share links

Make certain share link fields not editable, automatically grant permissions on migrate

Updated styling, error messages from expired / deleted links

frontend code linting, reversable sharelink migration

testing coverage

Update translation strings

No links message

* Consolidate file response methods

* improvements to share links on mobile devices

* Refactor share links file_version

* Add docs for share links

* Apply suggestions from code review

* When filtering share links, use the timezone aware now()

* Removes extra call to setup directories for usage in testing

* FIx copied badge display on some browsers

* Move copy to ngx-clipboard library

---------

Co-authored-by: Trenton H <797416+stumpylog@users.noreply.github.com>

src/documents/models.py

@@ -675,3 +675,63 @@ class Note(models.Model):
 
     def __str__(self):
         return self.note
+
+
+class ShareLink(models.Model):
+    class FileVersion(models.TextChoices):
+        ARCHIVE = ("archive", _("Archive"))
+        ORIGINAL = ("original", _("Original"))
+
+    created = models.DateTimeField(
+        _("created"),
+        default=timezone.now,
+        db_index=True,
+        blank=True,
+        editable=False,
+    )
+
+    expiration = models.DateTimeField(
+        _("expiration"),
+        blank=True,
+        null=True,
+        db_index=True,
+    )
+
+    slug = models.SlugField(
+        _("slug"),
+        db_index=True,
+        unique=True,
+        blank=True,
+        editable=False,
+    )
+
+    document = models.ForeignKey(
+        Document,
+        blank=True,
+        related_name="share_links",
+        on_delete=models.CASCADE,
+        verbose_name=_("document"),
+    )
+
+    file_version = models.CharField(
+        max_length=50,
+        choices=FileVersion.choices,
+        default=FileVersion.ARCHIVE,
+    )
+
+    owner = models.ForeignKey(
+        User,
+        blank=True,
+        null=True,
+        related_name="share_links",
+        on_delete=models.SET_NULL,
+        verbose_name=_("owner"),
+    )
+
+    class Meta:
+        ordering = ("created",)
+        verbose_name = _("share link")
+        verbose_name_plural = _("share links")
+
+    def __str__(self):
+        return f"Share Link for {self.document.title}"