/
database.py
743 lines (676 loc) · 27.6 KB
/
database.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
import os
import hashlib
import itertools
import json
from markupsafe import Markup, escape
from urllib.parse import parse_qsl, urlencode
import re
import sqlite_utils
import markupsafe
from datasette.utils import (
add_cors_headers,
await_me_maybe,
derive_named_parameters,
format_bytes,
tilde_decode,
to_css_class,
validate_sql_select,
is_url,
path_with_added_args,
path_with_format,
path_with_removed_args,
sqlite3,
truncate_url,
InvalidSql,
)
from datasette.utils.asgi import AsgiFileDownload, NotFound, Response, Forbidden
from datasette.plugins import pm
from .base import BaseView, DatasetteError, DataView, _error
class DatabaseView(DataView):
name = "database"
async def data(self, request, default_labels=False, _size=None):
db = await self.ds.resolve_database(request)
database = db.name
visible, private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-database", database),
"view-instance",
],
)
if not visible:
raise Forbidden("You do not have permission to view this database")
metadata = (self.ds.metadata("databases") or {}).get(database, {})
self.ds.update_with_inherited_metadata(metadata)
if request.args.get("sql"):
sql = request.args.get("sql")
validate_sql_select(sql)
return await QueryView(self.ds).data(
request, sql, _size=_size, metadata=metadata
)
table_counts = await db.table_counts(5)
hidden_table_names = set(await db.hidden_table_names())
all_foreign_keys = await db.get_all_foreign_keys()
views = []
for view_name in await db.view_names():
view_visible, view_private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-table", (database, view_name)),
("view-database", database),
"view-instance",
],
)
if view_visible:
views.append(
{
"name": view_name,
"private": view_private,
}
)
tables = []
for table in table_counts:
table_visible, table_private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-table", (database, table)),
("view-database", database),
"view-instance",
],
)
if not table_visible:
continue
table_columns = await db.table_columns(table)
tables.append(
{
"name": table,
"columns": table_columns,
"primary_keys": await db.primary_keys(table),
"count": table_counts[table],
"hidden": table in hidden_table_names,
"fts_table": await db.fts_table(table),
"foreign_keys": all_foreign_keys[table],
"private": table_private,
}
)
tables.sort(key=lambda t: (t["hidden"], t["name"]))
canned_queries = []
for query in (
await self.ds.get_canned_queries(database, request.actor)
).values():
query_visible, query_private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-query", (database, query["name"])),
("view-database", database),
"view-instance",
],
)
if query_visible:
canned_queries.append(dict(query, private=query_private))
async def database_actions():
links = []
for hook in pm.hook.database_actions(
datasette=self.ds,
database=database,
actor=request.actor,
request=request,
):
extra_links = await await_me_maybe(hook)
if extra_links:
links.extend(extra_links)
return links
attached_databases = [d.name for d in await db.attached_databases()]
allow_execute_sql = await self.ds.permission_allowed(
request.actor, "execute-sql", database, default=True
)
return (
{
"database": database,
"private": private,
"path": self.ds.urls.database(database),
"size": db.size,
"tables": tables,
"hidden_count": len([t for t in tables if t["hidden"]]),
"views": views,
"queries": canned_queries,
"allow_execute_sql": allow_execute_sql,
"table_columns": await _table_columns(self.ds, database)
if allow_execute_sql
else {},
},
{
"database_actions": database_actions,
"show_hidden": request.args.get("_show_hidden"),
"editable": True,
"metadata": metadata,
"allow_download": self.ds.setting("allow_download")
and not db.is_mutable
and not db.is_memory,
"attached_databases": attached_databases,
},
(f"database-{to_css_class(database)}.html", "database.html"),
)
class DatabaseDownload(DataView):
name = "database_download"
async def get(self, request):
database = tilde_decode(request.url_vars["database"])
await self.ds.ensure_permissions(
request.actor,
[
("view-database-download", database),
("view-database", database),
"view-instance",
],
)
try:
db = self.ds.get_database(route=database)
except KeyError:
raise DatasetteError("Invalid database", status=404)
if db.is_memory:
raise DatasetteError("Cannot download in-memory databases", status=404)
if not self.ds.setting("allow_download") or db.is_mutable:
raise Forbidden("Database download is forbidden")
if not db.path:
raise DatasetteError("Cannot download database", status=404)
filepath = db.path
headers = {}
if self.ds.cors:
add_cors_headers(headers)
if db.hash:
etag = '"{}"'.format(db.hash)
headers["Etag"] = etag
# Has user seen this already?
if_none_match = request.headers.get("if-none-match")
if if_none_match and if_none_match == etag:
return Response("", status=304)
headers["Transfer-Encoding"] = "chunked"
return AsgiFileDownload(
filepath,
filename=os.path.basename(filepath),
content_type="application/octet-stream",
headers=headers,
)
class QueryView(DataView):
async def data(
self,
request,
sql,
editable=True,
canned_query=None,
metadata=None,
_size=None,
named_parameters=None,
write=False,
):
db = await self.ds.resolve_database(request)
database = db.name
params = {key: request.args.get(key) for key in request.args}
if "sql" in params:
params.pop("sql")
if "_shape" in params:
params.pop("_shape")
private = False
if canned_query:
# Respect canned query permissions
visible, private = await self.ds.check_visibility(
request.actor,
permissions=[
("view-query", (database, canned_query)),
("view-database", database),
"view-instance",
],
)
if not visible:
raise Forbidden("You do not have permission to view this query")
else:
await self.ds.ensure_permissions(request.actor, [("execute-sql", database)])
# Extract any :named parameters
named_parameters = named_parameters or await derive_named_parameters(
self.ds.get_database(database), sql
)
named_parameter_values = {
named_parameter: params.get(named_parameter) or ""
for named_parameter in named_parameters
if not named_parameter.startswith("_")
}
# Set to blank string if missing from params
for named_parameter in named_parameters:
if named_parameter not in params and not named_parameter.startswith("_"):
params[named_parameter] = ""
extra_args = {}
if params.get("_timelimit"):
extra_args["custom_time_limit"] = int(params["_timelimit"])
if _size:
extra_args["page_size"] = _size
templates = [f"query-{to_css_class(database)}.html", "query.html"]
if canned_query:
templates.insert(
0,
f"query-{to_css_class(database)}-{to_css_class(canned_query)}.html",
)
query_error = None
# Execute query - as write or as read
if write:
if request.method == "POST":
# If database is immutable, return an error
if not db.is_mutable:
raise Forbidden("Database is immutable")
body = await request.post_body()
body = body.decode("utf-8").strip()
if body.startswith("{") and body.endswith("}"):
params = json.loads(body)
# But we want key=value strings
for key, value in params.items():
params[key] = str(value)
else:
params = dict(parse_qsl(body, keep_blank_values=True))
# Should we return JSON?
should_return_json = (
request.headers.get("accept") == "application/json"
or request.args.get("_json")
or params.get("_json")
)
if canned_query:
params_for_query = MagicParameters(params, request, self.ds)
else:
params_for_query = params
ok = None
try:
cursor = await self.ds.databases[database].execute_write(
sql, params_for_query
)
message = metadata.get(
"on_success_message"
) or "Query executed, {} row{} affected".format(
cursor.rowcount, "" if cursor.rowcount == 1 else "s"
)
message_type = self.ds.INFO
redirect_url = metadata.get("on_success_redirect")
ok = True
except Exception as e:
message = metadata.get("on_error_message") or str(e)
message_type = self.ds.ERROR
redirect_url = metadata.get("on_error_redirect")
ok = False
if should_return_json:
return Response.json(
{
"ok": ok,
"message": message,
"redirect": redirect_url,
}
)
else:
self.ds.add_message(request, message, message_type)
return self.redirect(request, redirect_url or request.path)
else:
async def extra_template():
return {
"request": request,
"db_is_immutable": not db.is_mutable,
"path_with_added_args": path_with_added_args,
"path_with_removed_args": path_with_removed_args,
"named_parameter_values": named_parameter_values,
"canned_query": canned_query,
"success_message": request.args.get("_success") or "",
"canned_write": True,
}
return (
{
"database": database,
"rows": [],
"truncated": False,
"columns": [],
"query": {"sql": sql, "params": params},
"private": private,
},
extra_template,
templates,
)
else: # Not a write
if canned_query:
params_for_query = MagicParameters(params, request, self.ds)
else:
params_for_query = params
try:
results = await self.ds.execute(
database, sql, params_for_query, truncate=True, **extra_args
)
columns = [r[0] for r in results.description]
except sqlite3.DatabaseError as e:
query_error = e
results = None
columns = []
allow_execute_sql = await self.ds.permission_allowed(
request.actor, "execute-sql", database, default=True
)
async def extra_template():
display_rows = []
truncate_cells = self.ds.setting("truncate_cells_html")
for row in results.rows if results else []:
display_row = []
for column, value in zip(results.columns, row):
display_value = value
# Let the plugins have a go
# pylint: disable=no-member
plugin_display_value = None
for candidate in pm.hook.render_cell(
row=row,
value=value,
column=column,
table=None,
database=database,
datasette=self.ds,
):
candidate = await await_me_maybe(candidate)
if candidate is not None:
plugin_display_value = candidate
break
if plugin_display_value is not None:
display_value = plugin_display_value
else:
if value in ("", None):
display_value = Markup(" ")
elif is_url(str(display_value).strip()):
display_value = markupsafe.Markup(
'<a href="{url}">{truncated_url}</a>'.format(
url=markupsafe.escape(value.strip()),
truncated_url=markupsafe.escape(
truncate_url(value.strip(), truncate_cells)
),
)
)
elif isinstance(display_value, bytes):
blob_url = path_with_format(
request=request,
format="blob",
extra_qs={
"_blob_column": column,
"_blob_hash": hashlib.sha256(
display_value
).hexdigest(),
},
)
formatted = format_bytes(len(value))
display_value = markupsafe.Markup(
'<a class="blob-download" href="{}"{}><Binary: {:,} byte{}></a>'.format(
blob_url,
' title="{}"'.format(formatted)
if "bytes" not in formatted
else "",
len(value),
"" if len(value) == 1 else "s",
)
)
else:
display_value = str(value)
if truncate_cells and len(display_value) > truncate_cells:
display_value = (
display_value[:truncate_cells] + "\u2026"
)
display_row.append(display_value)
display_rows.append(display_row)
# Show 'Edit SQL' button only if:
# - User is allowed to execute SQL
# - SQL is an approved SELECT statement
# - No magic parameters, so no :_ in the SQL string
edit_sql_url = None
is_validated_sql = False
try:
validate_sql_select(sql)
is_validated_sql = True
except InvalidSql:
pass
if allow_execute_sql and is_validated_sql and ":_" not in sql:
edit_sql_url = (
self.ds.urls.database(database)
+ "?"
+ urlencode(
{
**{
"sql": sql,
},
**named_parameter_values,
}
)
)
show_hide_hidden = ""
if metadata.get("hide_sql"):
if bool(params.get("_show_sql")):
show_hide_link = path_with_removed_args(request, {"_show_sql"})
show_hide_text = "hide"
show_hide_hidden = (
'<input type="hidden" name="_show_sql" value="1">'
)
else:
show_hide_link = path_with_added_args(request, {"_show_sql": 1})
show_hide_text = "show"
else:
if bool(params.get("_hide_sql")):
show_hide_link = path_with_removed_args(request, {"_hide_sql"})
show_hide_text = "show"
show_hide_hidden = (
'<input type="hidden" name="_hide_sql" value="1">'
)
else:
show_hide_link = path_with_added_args(request, {"_hide_sql": 1})
show_hide_text = "hide"
hide_sql = show_hide_text == "show"
return {
"display_rows": display_rows,
"custom_sql": True,
"named_parameter_values": named_parameter_values,
"editable": editable,
"canned_query": canned_query,
"edit_sql_url": edit_sql_url,
"metadata": metadata,
"settings": self.ds.settings_dict(),
"request": request,
"show_hide_link": self.ds.urls.path(show_hide_link),
"show_hide_text": show_hide_text,
"show_hide_hidden": markupsafe.Markup(show_hide_hidden),
"hide_sql": hide_sql,
"table_columns": await _table_columns(self.ds, database)
if allow_execute_sql
else {},
}
return (
{
"ok": not query_error,
"database": database,
"query_name": canned_query,
"rows": results.rows if results else [],
"truncated": results.truncated if results else False,
"columns": columns,
"query": {"sql": sql, "params": params},
"error": str(query_error) if query_error else None,
"private": private,
"allow_execute_sql": allow_execute_sql,
},
extra_template,
templates,
400 if query_error else 200,
)
class MagicParameters(dict):
def __init__(self, data, request, datasette):
super().__init__(data)
self._request = request
self._magics = dict(
itertools.chain.from_iterable(
pm.hook.register_magic_parameters(datasette=datasette)
)
)
def __len__(self):
# Workaround for 'Incorrect number of bindings' error
# https://github.com/simonw/datasette/issues/967#issuecomment-692951144
return super().__len__() or 1
def __getitem__(self, key):
if key.startswith("_") and key.count("_") >= 2:
prefix, suffix = key[1:].split("_", 1)
if prefix in self._magics:
try:
return self._magics[prefix](suffix, self._request)
except KeyError:
return super().__getitem__(key)
else:
return super().__getitem__(key)
class TableCreateView(BaseView):
name = "table-create"
_valid_keys = {"table", "rows", "row", "columns", "pk", "pks", "ignore", "replace"}
_supported_column_types = {
"text",
"integer",
"float",
"blob",
}
# Any string that does not contain a newline or start with sqlite_
_table_name_re = re.compile(r"^(?!sqlite_)[^\n]+$")
def __init__(self, datasette):
self.ds = datasette
async def post(self, request):
db = await self.ds.resolve_database(request)
database_name = db.name
# Must have create-table permission
if not await self.ds.permission_allowed(
request.actor, "create-table", resource=database_name
):
return _error(["Permission denied"], 403)
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 an object"])
invalid_keys = set(data.keys()) - self._valid_keys
if invalid_keys:
return _error(["Invalid keys: {}".format(", ".join(invalid_keys))])
# ignore and replace are mutually exclusive
if data.get("ignore") and data.get("replace"):
return _error(["ignore and replace are mutually exclusive"])
# ignore and replace only allowed with row or rows
if "ignore" in data or "replace" in data:
if not data.get("row") and not data.get("rows"):
return _error(["ignore and replace require row or rows"])
# ignore and replace require pk or pks
if "ignore" in data or "replace" in data:
if not data.get("pk") and not data.get("pks"):
return _error(["ignore and replace require pk or pks"])
ignore = data.get("ignore")
replace = data.get("replace")
table_name = data.get("table")
if not table_name:
return _error(["Table is required"])
if not self._table_name_re.match(table_name):
return _error(["Invalid table name"])
table_exists = await db.table_exists(data["table"])
columns = data.get("columns")
rows = data.get("rows")
row = data.get("row")
if not columns and not rows and not row:
return _error(["columns, rows or row is required"])
if rows and row:
return _error(["Cannot specify both rows and row"])
if columns:
if rows or row:
return _error(["Cannot specify columns with rows or row"])
if not isinstance(columns, list):
return _error(["columns must be a list"])
for column in columns:
if not isinstance(column, dict):
return _error(["columns must be a list of objects"])
if not column.get("name") or not isinstance(column.get("name"), str):
return _error(["Column name is required"])
if not column.get("type"):
column["type"] = "text"
if column["type"] not in self._supported_column_types:
return _error(
["Unsupported column type: {}".format(column["type"])]
)
# No duplicate column names
dupes = {c["name"] for c in columns if columns.count(c) > 1}
if dupes:
return _error(["Duplicate column name: {}".format(", ".join(dupes))])
if row:
rows = [row]
if rows:
if not isinstance(rows, list):
return _error(["rows must be a list"])
for row in rows:
if not isinstance(row, dict):
return _error(["rows must be a list of objects"])
pk = data.get("pk")
pks = data.get("pks")
if pk and pks:
return _error(["Cannot specify both pk and pks"])
if pk:
if not isinstance(pk, str):
return _error(["pk must be a string"])
if pks:
if not isinstance(pks, list):
return _error(["pks must be a list"])
for pk in pks:
if not isinstance(pk, str):
return _error(["pks must be a list of strings"])
# If table exists already, read pks from that instead
if table_exists:
actual_pks = await db.primary_keys(table_name)
# if pk passed and table already exists check it does not change
bad_pks = False
if len(actual_pks) == 1 and data.get("pk") and data["pk"] != actual_pks[0]:
bad_pks = True
elif (
len(actual_pks) > 1
and data.get("pks")
and set(data["pks"]) != set(actual_pks)
):
bad_pks = True
if bad_pks:
return _error(["pk cannot be changed for existing table"])
pks = actual_pks
def create_table(conn):
table = sqlite_utils.Database(conn)[table_name]
if rows:
table.insert_all(rows, pk=pks or pk, ignore=ignore, replace=replace)
else:
table.create(
{c["name"]: c["type"] for c in columns},
pk=pks or pk,
)
return table.schema
try:
schema = await db.execute_write_fn(create_table)
except Exception as e:
return _error([str(e)])
table_url = self.ds.absolute_url(
request, self.ds.urls.table(db.name, table_name)
)
table_api_url = self.ds.absolute_url(
request, self.ds.urls.table(db.name, table_name, format="json")
)
details = {
"ok": True,
"database": db.name,
"table": table_name,
"table_url": table_url,
"table_api_url": table_api_url,
"schema": schema,
}
if rows:
details["row_count"] = len(rows)
return Response.json(details, status=201)
async def _table_columns(datasette, database_name):
internal = datasette.get_database("_internal")
result = await internal.execute(
"select table_name, name from columns where database_name = ?",
[database_name],
)
table_columns = {}
for row in result.rows:
table_columns.setdefault(row["table_name"], []).append(row["name"])
# Add views
db = datasette.get_database(database_name)
for view_name in await db.view_names():
table_columns[view_name] = []
return table_columns