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
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.

use deno_core::error::AnyError;
use deno_core::include_js_files;
use deno_core::op_sync;
use deno_core::Extension;
use deno_core::OpState;
use rusqlite::params;
use rusqlite::Connection;
use rusqlite::OptionalExtension;
use serde::Deserialize;
use std::fmt;
use std::path::PathBuf;

#[derive(Clone)]
struct OriginStorageDir(PathBuf);

pub fn init(origin_storage_dir: Option<PathBuf>) -> Extension {
  Extension::builder()
    .js(include_js_files!(
      prefix "deno:extensions/webstorage",
      "01_webstorage.js",
    ))
    .ops(vec![
      ("op_webstorage_length", op_sync(op_webstorage_length)),
      ("op_webstorage_key", op_sync(op_webstorage_key)),
      ("op_webstorage_set", op_sync(op_webstorage_set)),
      ("op_webstorage_get", op_sync(op_webstorage_get)),
      ("op_webstorage_remove", op_sync(op_webstorage_remove)),
      ("op_webstorage_clear", op_sync(op_webstorage_clear)),
      (
        "op_webstorage_iterate_keys",
        op_sync(op_webstorage_iterate_keys),
      ),
    ])
    .state(move |state| {
      if let Some(origin_storage_dir) = origin_storage_dir.clone() {
        state.put(OriginStorageDir(origin_storage_dir));
      }
      Ok(())
    })
    .build()
}

pub fn get_declaration() -> PathBuf {
  PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("lib.deno_webstorage.d.ts")
}

struct LocalStorage(Connection);
struct SessionStorage(Connection);

fn get_webstorage(
  state: &mut OpState,
  persistent: bool,
) -> Result<&Connection, AnyError> {
  let conn = if persistent {
    if state.try_borrow::<LocalStorage>().is_none() {
      let path = state.try_borrow::<OriginStorageDir>().ok_or_else(|| {
        DomExceptionNotSupportedError::new(
          "LocalStorage is not supported in this context.",
        )
      })?;
      std::fs::create_dir_all(&path.0)?;
      let conn = Connection::open(path.0.join("local_storage"))?;
      conn.execute(
        "CREATE TABLE IF NOT EXISTS data (key VARCHAR UNIQUE, value VARCHAR)",
        params![],
      )?;

      state.put(LocalStorage(conn));
    }

    &state.borrow::<LocalStorage>().0
  } else {
    if state.try_borrow::<SessionStorage>().is_none() {
      let conn = Connection::open_in_memory()?;
      conn.execute(
        "CREATE TABLE data (key VARCHAR UNIQUE, value VARCHAR)",
        params![],
      )?;

      state.put(SessionStorage(conn));
    }

    &state.borrow::<SessionStorage>().0
  };

  Ok(conn)
}

pub fn op_webstorage_length(
  state: &mut OpState,
  persistent: bool,
  _: (),
) -> Result<u32, AnyError> {
  let conn = get_webstorage(state, persistent)?;

  let mut stmt = conn.prepare("SELECT COUNT(*) FROM data")?;

  let length: u32 = stmt.query_row(params![], |row| row.get(0))?;

  Ok(length)
}

pub fn op_webstorage_key(
  state: &mut OpState,
  index: u32,
  persistent: bool,
) -> Result<Option<String>, AnyError> {
  let conn = get_webstorage(state, persistent)?;

  let mut stmt = conn.prepare("SELECT key FROM data LIMIT 1 OFFSET ?")?;

  let key: Option<String> = stmt
    .query_row(params![index], |row| row.get(0))
    .optional()?;

  Ok(key)
}

#[derive(Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct SetArgs {
  key_name: String,
  key_value: String,
}

pub fn op_webstorage_set(
  state: &mut OpState,
  args: SetArgs,
  persistent: bool,
) -> Result<(), AnyError> {
  let conn = get_webstorage(state, persistent)?;

  let mut stmt =
    conn.prepare("SELECT SUM(pgsize) FROM dbstat WHERE name = 'data'")?;
  let size: u32 = stmt.query_row(params![], |row| row.get(0))?;

  if size >= 5000000 {
    return Err(
      deno_web::DomExceptionQuotaExceededError::new(
        "Exceeded maximum storage size",
      )
      .into(),
    );
  }

  conn.execute(
    "INSERT OR REPLACE INTO data (key, value) VALUES (?, ?)",
    params![args.key_name, args.key_value],
  )?;

  Ok(())
}

pub fn op_webstorage_get(
  state: &mut OpState,
  key_name: String,
  persistent: bool,
) -> Result<Option<String>, AnyError> {
  let conn = get_webstorage(state, persistent)?;

  let mut stmt = conn.prepare("SELECT value FROM data WHERE key = ?")?;

  let val = stmt
    .query_row(params![key_name], |row| row.get(0))
    .optional()?;

  Ok(val)
}

pub fn op_webstorage_remove(
  state: &mut OpState,
  key_name: String,
  persistent: bool,
) -> Result<(), AnyError> {
  let conn = get_webstorage(state, persistent)?;

  conn.execute("DELETE FROM data WHERE key = ?", params![key_name])?;

  Ok(())
}

pub fn op_webstorage_clear(
  state: &mut OpState,
  persistent: bool,
  _: (),
) -> Result<(), AnyError> {
  let conn = get_webstorage(state, persistent)?;

  conn.execute("DROP TABLE data", params![])?;
  conn.execute(
    "CREATE TABLE data (key VARCHAR UNIQUE, value VARCHAR)",
    params![],
  )?;

  Ok(())
}

pub fn op_webstorage_iterate_keys(
  state: &mut OpState,
  persistent: bool,
  _: (),
) -> Result<Vec<String>, AnyError> {
  let conn = get_webstorage(state, persistent)?;

  let mut stmt = conn.prepare("SELECT key FROM data")?;

  let keys = stmt
    .query_map(params![], |row| row.get::<_, String>(0))?
    .map(|r| r.unwrap())
    .collect();

  Ok(keys)
}

#[derive(Debug)]
pub struct DomExceptionNotSupportedError {
  pub msg: String,
}

impl DomExceptionNotSupportedError {
  pub fn new(msg: &str) -> Self {
    DomExceptionNotSupportedError {
      msg: msg.to_string(),
    }
  }
}

impl fmt::Display for DomExceptionNotSupportedError {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    f.pad(&self.msg)
  }
}

impl std::error::Error for DomExceptionNotSupportedError {}

pub fn get_not_supported_error_class_name(
  e: &AnyError,
) -> Option<&'static str> {
  e.downcast_ref::<DomExceptionNotSupportedError>()
    .map(|_| "DOMExceptionNotSupportedError")
}