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from secrets import token_urlsafe
from sqlite3 import Connection, IntegrityError
def put(conn: Connection, name: str, content: bytes, content_type: str):
with conn:
conn.execute(
"INSERT OR IGNORE INTO file (content) VALUES (?)",
(content,),
)
(content_hash,) = conn.execute("SELECT DATA_HASH(?)", (content,)).fetchone()
cur = conn.execute(
"""UPDATE link
SET content_type = ?, file_hash = ?
WHERE name_hash = DATA_HASH(?)""",
(content_type, content_hash, name),
)
if cur.rowcount == 1:
return False, content_hash
conn.execute(
"""INSERT INTO link (
name, content_type, file_hash
) VALUES (?, ?, ?)""",
(name, content_type, content_hash),
)
return True, content_hash
def post(conn: Connection, prefix: str, content: bytes, content_type: str):
with conn:
conn.execute(
"INSERT OR IGNORE INTO file (content) VALUES (?)",
(content,),
)
(content_hash,) = conn.execute("SELECT DATA_HASH(?)", (content,)).fetchone()
for _ in range(16):
name = prefix + token_urlsafe(5)
try:
conn.execute(
"""INSERT INTO link (name, content_type, file_hash)
VALUES (?, ?, ?)""",
(name, content_type, content_hash),
)
except IntegrityError:
continue
break
else:
raise RuntimeError("Could not insert a link in 16 attempts")
return name, content_hash
def get(conn: Connection, name: str):
row = conn.execute(
"""SELECT link.content_type, file.hash, file.content
FROM link
JOIN file ON file.hash = link.file_hash
WHERE name_hash = DATA_HASH(?)""",
(name,),
).fetchone()
return row
def head(conn: Connection, name: str):
row = conn.execute(
"""SELECT link.content_type, file.hash, length(file.content)
FROM link
JOIN file ON file.hash = link.file_hash
WHERE name_hash = DATA_HASH(?)""",
(name,),
).fetchone()
return row
def delete(conn: Connection, name: str):
with conn:
cur = conn.execute("DELETE FROM link WHERE name_hash = DATA_HASH(?)", (name,))
return cur.rowcount == 1
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