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row.py
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row.py
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from datasette.utils.asgi import NotFound, Forbidden, Response
from datasette.database import QueryInterrupted
from .base import DataView, BaseView, _error
from datasette.utils import (
tilde_decode,
urlsafe_components,
to_css_class,
escape_sqlite,
row_sql_params_pks,
)
import json
import sqlite_utils
from .table import display_columns_and_rows
class RowView(DataView):
name = "row"
async def data(self, request, default_labels=False):
resolved = await self.ds.resolve_row(request)
database = resolved.db.name
table = resolved.table
pk_values = resolved.pk_values
# Ensure user has permission to view this row
visible, private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-table", (database, table)),
("view-database", database),
"view-instance",
],
)
if not visible:
raise Forbidden("You do not have permission to view this table")
results = await resolved.db.execute(
resolved.sql, resolved.params, truncate=True
)
columns = [r[0] for r in results.description]
rows = list(results.rows)
if not rows:
raise NotFound(f"Record not found: {pk_values}")
async def template_data():
display_columns, display_rows = await display_columns_and_rows(
self.ds,
database,
table,
results.description,
rows,
link_column=False,
truncate_cells=0,
)
for column in display_columns:
column["sortable"] = False
return {
"private": private,
"foreign_key_tables": await self.foreign_key_tables(
database, table, pk_values
),
"display_columns": display_columns,
"display_rows": display_rows,
"custom_table_templates": [
f"_table-{to_css_class(database)}-{to_css_class(table)}.html",
f"_table-row-{to_css_class(database)}-{to_css_class(table)}.html",
"_table.html",
],
"metadata": (self.ds.metadata("databases") or {})
.get(database, {})
.get("tables", {})
.get(table, {}),
}
data = {
"database": database,
"table": table,
"rows": rows,
"columns": columns,
"primary_keys": resolved.pks,
"primary_key_values": pk_values,
"units": self.ds.table_metadata(database, table).get("units", {}),
}
if "foreign_key_tables" in (request.args.get("_extras") or "").split(","):
data["foreign_key_tables"] = await self.foreign_key_tables(
database, table, pk_values
)
return (
data,
template_data,
(
f"row-{to_css_class(database)}-{to_css_class(table)}.html",
"row.html",
),
)
async def foreign_key_tables(self, database, table, pk_values):
if len(pk_values) != 1:
return []
db = self.ds.databases[database]
all_foreign_keys = await db.get_all_foreign_keys()
foreign_keys = all_foreign_keys[table]["incoming"]
if len(foreign_keys) == 0:
return []
sql = "select " + ", ".join(
[
"(select count(*) from {table} where {column}=:id)".format(
table=escape_sqlite(fk["other_table"]),
column=escape_sqlite(fk["other_column"]),
)
for fk in foreign_keys
]
)
try:
rows = list(await db.execute(sql, {"id": pk_values[0]}))
except QueryInterrupted:
# Almost certainly hit the timeout
return []
foreign_table_counts = dict(
zip(
[(fk["other_table"], fk["other_column"]) for fk in foreign_keys],
list(rows[0]),
)
)
foreign_key_tables = []
for fk in foreign_keys:
count = (
foreign_table_counts.get((fk["other_table"], fk["other_column"])) or 0
)
key = fk["other_column"]
if key.startswith("_"):
key += "__exact"
link = "{}?{}={}".format(
self.ds.urls.table(database, fk["other_table"]),
key,
",".join(pk_values),
)
foreign_key_tables.append({**fk, **{"count": count, "link": link}})
return foreign_key_tables
class RowError(Exception):
def __init__(self, error):
self.error = error
async def _resolve_row_and_check_permission(datasette, request, permission):
from datasette.app import DatabaseNotFound, TableNotFound, RowNotFound
try:
resolved = await datasette.resolve_row(request)
except DatabaseNotFound as e:
return False, _error(["Database not found: {}".format(e.database_name)], 404)
except TableNotFound as e:
return False, _error(["Table not found: {}".format(e.table)], 404)
except RowNotFound as e:
return False, _error(["Record not found: {}".format(e.pk_values)], 404)
# Ensure user has permission to delete this row
if not await datasette.permission_allowed(
request.actor, permission, resource=(resolved.db.name, resolved.table)
):
return False, _error(["Permission denied"], 403)
return True, resolved
class RowDeleteView(BaseView):
name = "row-delete"
def __init__(self, datasette):
self.ds = datasette
async def post(self, request):
ok, resolved = await _resolve_row_and_check_permission(
self.ds, request, "delete-row"
)
if not ok:
return resolved
# Delete table
def delete_row(conn):
sqlite_utils.Database(conn)[resolved.table].delete(resolved.pk_values)
try:
await resolved.db.execute_write_fn(delete_row)
except Exception as e:
return _error([str(e)], 500)
return Response.json({"ok": True}, status=200)
class RowUpdateView(BaseView):
name = "row-update"
def __init__(self, datasette):
self.ds = datasette
async def post(self, request):
ok, resolved = await _resolve_row_and_check_permission(
self.ds, request, "update-row"
)
if not ok:
return resolved
body = await request.post_body()
try:
data = json.loads(body)
except json.JSONDecodeError as e:
return _error(["Invalid JSON: {}".format(e)])
if not isinstance(data, dict):
return _error(["JSON must be a dictionary"])
if not "update" in data or not isinstance(data["update"], dict):
return _error(["JSON must contain an update dictionary"])
update = data["update"]
def update_row(conn):
sqlite_utils.Database(conn)[resolved.table].update(
resolved.pk_values, update
)
try:
await resolved.db.execute_write_fn(update_row)
except Exception as e:
return _error([str(e)], 400)
result = {"ok": True}
if data.get("return"):
results = await resolved.db.execute(
resolved.sql, resolved.params, truncate=True
)
rows = list(results.rows)
result["row"] = dict(rows[0])
return Response.json(result, status=200)