Terminal UI for managing library restrictions

src/calibre/srv/standalone.py

@@ -7,6 +7,7 @@ __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
 
 import sys, os, signal
+from functools import partial
 
 from calibre import as_unicode, prints
 from calibre.constants import plugins, iswindows, preferred_encoding
@@ -87,7 +88,11 @@ def manage_users(path=None):
     m = UserManager(path)
     enc = getattr(sys.stdin, 'encoding', preferred_encoding) or preferred_encoding
 
-    def choice(question, choices, default=None, banner=''):
+    def get_input(prompt):
+        prints(prompt, end=' ')
+        return raw_input().decode(enc)
+
+    def choice(question=_('What do you want to do?'), choices=(), default=None, banner=''):
         prints(banner)
         for i, choice in enumerate(choices):
             prints('%d)' % (i+1), choice)
@@ -96,10 +101,11 @@ def manage_users(path=None):
             prompt = question + ' [1-%d]:' % len(choices)
             if default is not None:
                 prompt = question + ' [1-%d %s: %d]' % (len(choices), _('default'), default+1)
-            reply = raw_input(prompt)
+            reply = get_input(prompt)
             if not reply and default is not None:
                 reply = str(default + 1)
             if not reply:
+                prints(_('No choice selected, exiting...'))
                 raise SystemExit(0)
             reply = reply.strip()
             try:
@@ -112,7 +118,7 @@ def manage_users(path=None):
 
     def get_valid(prompt, invalidq=lambda x: None):
         while True:
-            ans = raw_input(prompt + ': ').strip().decode(enc)
+            ans = get_input(prompt + ':').strip()
             fail_message = invalidq(ans)
             if fail_message is None:
                 return ans
@@ -154,24 +160,80 @@ def manage_users(path=None):
 
     def remove_user():
         un = get_valid_user()
-        if raw_input((_('Are you sure you want to remove the user %s?') % un) + ' [y/n]: ').decode(enc) != 'y':
+        if get_input((_('Are you sure you want to remove the user %s?') % un) + ' [y/n]:') != 'y':
             raise SystemExit(0)
         m.remove_user(un)
         prints(_('User %s successfully removed!') % un)
 
-    def edit_user():
+    def change_password(username):
-        username = get_valid_user()
         pw = get_pass(username)
         m.change_password(username, pw)
         prints(_('Password for %s successfully changed!') % username)
 
-    def show_password():
+    def show_password(username):
-        username = get_valid_user()
         pw = m.get(username)
-        prints(_('Password for {0} is: {1}').format(username, pw))
+        prints(_('Current password for {0} is: {1}').format(username, pw))
 
-    {0:add_user, 1:edit_user, 2:remove_user, 3:show_password}[choice(_('What do you want to do?'), [
+    def change_readonly(username):
-        _('Add a new user'), _('Edit an existing user'), _('Remove a user'), _('Show the password for a user')])]()
+        readonly = m.is_readonly(username)
+        if readonly:
+            q = _('Allow {} to make changes (i.e. grant write access)?')
+        else:
+            q = _('Prevent {} from making changes (i.e. remove write access)?')
+        if get_input(q.format(username) + ' [y/n]:').lower() == 'y':
+            m.set_readonly(username, not readonly)
+
+    def change_restriction(username):
+        r = m.restrictions(username) or {}
+        if r['allowed_library_names']:
+            prints(_('{} is currently only allowed to access the libraries named: {}').format(
+                username, ', '.join(r['allowed_library_names'])))
+        if r['blocked_library_names']:
+            prints(_('{} is currently not allowed to access the libraries named: {}').format(
+                username, ', '.join(r['blocked_library_names'])))
+        c = choice(choices=[
+            _('Allow access to all libraries'), _('Allow access to only specified libraries'),
+            _('Allow access to all, except specified libraries'), _('Cancel')])
+        if c == 0:
+            m.update_user_restrictions(username, {})
+        elif c == 3:
+            pass
+        else:
+            names = get_input(_('Enter a comma separated list of library names:'))
+            names = filter(None, [x.strip() for x in names.split(',')])
+            w = 'allowed_library_names' if c == 1 else 'blocked_library_names'
+            t = _('Allowing access only to libraries: {}') if c == 1 else _(
+                'Allowing access to all libraries, except: {}')
+            prints(t.format(', '.join(names)))
+            m.update_user_restrictions(username, {w:names})
+
+    def edit_user(username=None):
+        username = username or get_valid_user()
+        c = choice(choices=[
+            _('Show password for {}').format(username),
+            _('Change password for {}').format(username),
+            _('Change read/write permission for {}').format(username),
+            _('Change the libraries {} is allowed to access').format(username),
+            _('Cancel'),
+        ], banner='\n' + _('{} has {} access').format(
+            username, _('readonly') if m.is_readonly(username) else _('read-write'))
+        )
+        print()
+        if c > 3:
+            actions.append(toplevel)
+            return
+        {0: show_password, 1: change_password, 2: change_readonly, 3: change_restriction}[c](username)
+        actions.append(partial(edit_user, username=username))
+
+    def toplevel():
+        {0:add_user, 1:edit_user, 2:remove_user, 3:lambda: None}[choice(choices=[
+            _('Add a new user'), _('Edit an existing user'), _('Remove a user'),
+            _('Cancel')])]()
+
+    actions = [toplevel]
+    while actions:
+        actions[0]()
+        del actions[0]
 
 
 # }}}

src/calibre/srv/users.py

@@ -24,6 +24,24 @@ def load_json(raw):
         return {}
 
 
+def parse_restriction(raw):
+    r = load_json(raw)
+    if not isinstance(r, dict):
+        r = {}
+    r['allowed_library_names'] = frozenset(r.get('allowed_library_names', ()))
+    r['blocked_library_names'] = frozenset(r.get('blocked_library_names', ()))
+    return r
+
+
+def serialize_restriction(r):
+    ans = {}
+    for x in 'allowed_library_names blocked_library_names'.split():
+        v = r.get(x)
+        if v:
+            ans[x] = list(v)
+    return json.dumps(ans)
+
+
 class UserManager(object):
 
     lock = RLock()
@@ -62,6 +80,7 @@ class UserManager(object):
         self.path = os.path.join(config_dir, 'server-users.sqlite') if path is None else path
         self._conn = None
         self._restrictions = {}
+        self._readonly = {}
 
     def get_session_data(self, username):
         with self.lock:
@@ -92,8 +111,9 @@ class UserManager(object):
     def validate_username(self, username):
         if self.has_user(username):
             return _('The username %s already exists') % username
-        if re.sub(r'[a-zA-Z0-9 ]', '', username):
+        if re.sub(r'[a-zA-Z_0-9 ]', '', username):
-            return _('For maximum compatibility you should use only the letters A-Z, the numbers 0-9 and spaces in the username')
+            return _('For maximum compatibility you should use only the letters A-Z,'
+                     ' the numbers 0-9 and spaces or underscores in the username')
 
     def validate_password(self, pw):
         try:
@@ -107,11 +127,9 @@ class UserManager(object):
             if msg is not None:
                 raise ValueError(msg)
             restriction = restriction or {}
-            if not isinstance(restriction, dict):
-                raise TypeError('restriction must be a dict')
             self.conn.cursor().execute(
                 'INSERT INTO users (name, pw, restriction, readonly) VALUES (?, ?, ?, ?)',
-                (username, pw, json.dumps(restriction), ('y' if readonly else 'n')))
+                (username, pw, serialize_restriction(restriction), ('y' if readonly else 'n')))
 
     def remove_user(self, username):
         with self.lock:
@@ -124,6 +142,49 @@ class UserManager(object):
             return {x for x, in self.conn.cursor().execute(
                 'SELECT name FROM users')}
 
+    @property
+    def user_data(self):
+        with self.lock:
+            ans = {}
+            for name, pw, restriction, readonly in self.conn.cursor().execute('SELECT name,pw,restriction,readonly FROM users'):
+                ans[name] = {
+                    'pw':pw, 'restriction':parse_restriction(restriction), 'readonly': readonly.lower() == 'y'
+                }
+        return ans
+
+    @user_data.setter
+    def user_data(self, users):
+        with self.lock, self.conn:
+            c = self.conn.cursor()
+            for name, data in users.iteritems():
+                res = serialize_restriction(data['restriction'])
+                r = 'y' if data['readonly'] else 'n'
+                c.execute('UPDATE users SET (pw, restriction, readonly) VALUES (?,?,?) WHERE name=?',
+                        data['pw'], res, r, name)
+                if self.conn.changes() > 0:
+                    continue
+                c.execute('INSERT INTO USERS (name, pw, restriction, readonly)', name, data['pw'], res, r)
+            self._restrictions.clear()
+            self._readonly.clear()
+
+    def is_readonly(self, username):
+        with self.lock:
+            try:
+                return self._readonly[username]
+            except KeyError:
+                self._readonly[username] = False
+            for readonly, in self.conn.cursor().execute(
+                    'SELECT readonly FROM users WHERE name=?', (username,)):
+                self._readonly[username] = readonly == 'y'
+                return self._readonly[username]
+        return False
+
+    def set_readonly(self, username, value):
+        with self.lock:
+            self.conn.cursor().execute(
+                'UPDATE users SET readonly=? WHERE name=?', ('y' if value else 'n', username))
+            self._readonly.pop(username, None)
+
     def change_password(self, username, pw):
         with self.lock:
             msg = self.validate_password(pw)
@@ -136,11 +197,10 @@ class UserManager(object):
         with self.lock:
             r = self._restrictions.get(username)
             if r is None:
+                r = self._restrictions[username] = parse_restriction('{}')
                 for restriction, in self.conn.cursor().execute(
                         'SELECT restriction FROM users WHERE name=?', (username,)):
-                    self._restrictions[username] = r = json.loads(restriction)
+                    self._restrictions[username] = r = parse_restriction(restriction)
-                    r['allowed_library_names'] = frozenset(r.get('allowed_library_names', ()))
-                    r['blocked_library_names'] = frozenset(r.get('blocked_library_names', ()))
                     break
             return r
 
@@ -163,4 +223,4 @@ class UserManager(object):
         with self.lock:
             self._restrictions.pop(username, None)
             self.conn.cursor().execute(
-                'UPDATE users SET restriction=? WHERE name=?', (json.dumps(restrictions), username))
+                'UPDATE users SET restriction=? WHERE name=?', (serialize_restriction(restrictions), username))