Drop table button in alter dialog

datasette/static/app.css

@@ -2542,6 +2542,22 @@ dialog.table-alter-dialog::backdrop {
     color: var(--ink);
 }
 
+.table-alter-dialog .btn-danger {
+    background: #b91c1c;
+    color: #fff;
+    margin-right: auto;
+}
+
+.table-alter-dialog .btn-danger:hover {
+    background: #991b1b;
+}
+
+.table-alter-dialog .btn-danger:disabled,
+.table-alter-dialog .btn-danger:disabled:hover {
+    background: #d98c8c;
+    color: #fff;
+}
+
 .table-alter-dialog .btn-primary {
     background: var(--accent);
     color: #fff;

datasette/static/edit-tools.js

@@ -1571,6 +1571,7 @@ function setTableAlterDialogSaving(state, isSaving) {
   state.cancelButton.disabled = isSaving;
   state.addColumnButton.disabled = isSaving;
   state.backButton.disabled = isSaving;
+  state.dropButton.disabled = isSaving;
   state.saveButton.textContent = isSaving
     ? state.mode === "review"
       ? "Applying..."
@@ -2465,6 +2466,8 @@ function showTableAlterEditor(state) {
   state.review.hidden = true;
   state.review.textContent = "";
   state.backButton.hidden = true;
+  var data = tableAlterData();
+  state.dropButton.hidden = !(data && data.dropPath);
   state.saveButton.textContent = tableAlterSaveButtonText(state);
   updateTableAlterMoveButtons(state);
   updateTableAlterSaveButtonState(state);
@@ -2479,6 +2482,7 @@ function showTableAlterReview(state, result) {
   state.review.hidden = false;
   state.review.textContent = "";
   state.backButton.hidden = false;
+  state.dropButton.hidden = true;
   state.saveButton.textContent = tableAlterSaveButtonText(state);
   updateTableAlterSaveButtonState(state);
 
@@ -2565,6 +2569,64 @@ async function applyTableAlterChanges(state, result) {
   }
 }
 
+function tableAlterDatabaseUrl() {
+  var data = tableAlterData();
+  if (!data || !data.path) {
+    return null;
+  }
+  var url = new URL(data.path, location.href);
+  url.pathname = url.pathname.replace(/\/[^/]+\/-\/alter\/?$/, "");
+  url.search = "";
+  url.hash = "";
+  return url.toString();
+}
+
+async function dropTableFromAlterDialog(state) {
+  if (state.isSaving) {
+    return;
+  }
+  var data = tableAlterData();
+  if (!data || !data.dropPath) {
+    return;
+  }
+  if (
+    !window.confirm(
+      'Permanently delete the table "' +
+        data.tableName +
+        '"? This will delete all of its data and cannot be undone.',
+    )
+  ) {
+    return;
+  }
+  clearTableAlterDialogError(state);
+  setTableAlterDialogSaving(state, true);
+  try {
+    var response = await fetch(data.dropPath, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+        Accept: "application/json",
+      },
+      body: JSON.stringify({ confirm: true }),
+    });
+    var responseData = null;
+    try {
+      responseData = await response.json();
+    } catch (_error) {
+      responseData = null;
+    }
+    if (!response.ok || (responseData && responseData.ok === false)) {
+      throw rowMutationRequestError(response, responseData);
+    }
+    state.shouldRestoreFocus = false;
+    state.dialog.close();
+    window.location.href = tableAlterDatabaseUrl() || "/";
+  } catch (error) {
+    setTableAlterDialogSaving(state, false);
+    showTableAlterDialogError(state, error.message || "Could not drop table");
+  }
+}
+
 async function saveTableAlterDialog(state) {
   if (state.isSaving) {
     return;
@@ -2646,6 +2708,7 @@ function ensureTableAlterDialog(manager) {
       </div>
       <div class="table-alter-review" hidden></div>
       <div class="modal-footer">
+        <button type="button" class="btn btn-danger table-alter-drop" hidden>Drop table</button>
         <button type="button" class="btn btn-ghost table-alter-back" hidden>Back</button>
         <button type="button" class="btn btn-ghost table-alter-cancel">Cancel</button>
         <button type="submit" class="btn btn-primary table-alter-save">Review changes</button>
@@ -2664,6 +2727,7 @@ function ensureTableAlterDialog(manager) {
     columnList: dialog.querySelector(".table-alter-column-list"),
     addColumnButton: dialog.querySelector(".table-alter-add-column"),
     backButton: dialog.querySelector(".table-alter-back"),
+    dropButton: dialog.querySelector(".table-alter-drop"),
     cancelButton: dialog.querySelector(".table-alter-cancel"),
     saveButton: dialog.querySelector(".table-alter-save"),
     currentButton: null,
@@ -2703,6 +2767,10 @@ function ensureTableAlterDialog(manager) {
     closeTableAlterDialog(tableAlterDialogState);
   });
 
+  tableAlterDialogState.dropButton.addEventListener("click", function () {
+    dropTableFromAlterDialog(tableAlterDialogState);
+  });
+
   tableAlterDialogState.backButton.addEventListener("click", function () {
     if (tableAlterDialogState.isSaving) {
       return;

datasette/views/table.py

@@ -422,6 +422,15 @@ async def _table_alter_ui(
         data["customColumnTypes"] = _custom_column_type_options_for_create_table(
             datasette
         )
+    can_drop_table = await datasette.allowed(
+        action="drop-table",
+        resource=TableResource(database=database_name, table=table_name),
+        actor=request.actor,
+    )
+    if can_drop_table:
+        data["dropPath"] = "{}/-/drop".format(
+            datasette.urls.table(database_name, table_name)
+        )
     return data
 
 
@@ -1193,6 +1202,11 @@ class TableDropView(BaseView):
                 actor=request.actor, database=database_name, table=table_name
             )
         )
+        self.ds.add_message(
+            request,
+            "Table {} dropped".format(table_name),
+            self.ds.WARNING,
+        )
         return Response.json({"ok": True}, status=200)
 
 

tests/test_table_html.py

@@ -1089,8 +1089,9 @@ async def test_table_alter_action_button_and_data():
                     "tables": {
                         "items": {
                             "permissions": {
-                                "alter-table": {"id": "root"},
+                                "alter-table": {"id": ["root", "alter-only"]},
                                 "set-column-type": {"id": "root"},
+                                "drop-table": {"id": "root"},
                             },
                             "column_types": {"name": "textarea"},
                         },
@@ -1147,6 +1148,7 @@ async def test_table_alter_action_button_and_data():
             "textarea",
             "url",
         ]
+        assert alter_data["dropPath"] == "/data/items/-/drop"
         assert alter_data["columns"] == [
             {
                 "name": "id",
@@ -1192,6 +1194,16 @@ async def test_table_alter_action_button_and_data():
             is None
         )
         assert "alterTable" not in table_data_from_soup(soup_without_permission)
+
+        # An actor that can alter but not drop should not get a dropPath
+        response_alter_only = await ds.client.get(
+            "/data/items", actor={"id": "alter-only"}
+        )
+        assert response_alter_only.status_code == 200
+        alter_only_data = table_data_from_soup(
+            Soup(response_alter_only.text, "html.parser")
+        )["alterTable"]
+        assert "dropPath" not in alter_only_data
     finally:
         ds.close()