Theoretically, if a selfie is loaded from corrupted
storage resulting in a thrown exception from the
constructor, this would cause an improperly initialized
HostnameBasedDB instance and overall potentially a
broken uBO.
Related feedback:
- https://bugzilla.mozilla.org/show_bug.cgi?id=1543880#c7
Since https://github.com/uBlockOrigin/uBlock-issues/issues/156
won't be fixed in next release, no need to ship
with code which will be unused, and anyways only once
the fix is worked on will it be clear exactly what needs
to be used by scriptlets to deal harmoniously with
property listener collisions.
Make sure the parser is safely compatible with old
resources format -- for those users still using
custom resources (via `userResourcesLocation`).
Prepare code for future fix to
<https://github.com/uBlockOrigin/uBlock-issues/issues/156>:
This commit introduces a new private Map() object,
`uBOSafe`, accessible by all injected scriptlets. This
private safe can be used to store data which can be shared
with different scriptlets. The idea is for scriptlets to
use that safe to graciously deal with the need to install
multiple listeners for the same property.
Since resources are now immutable, by default they are
only compiled once each time uBO updates to a new
version. However I need a way to force a re-compiling
of the resource in the dev build. This commit adds code
to invalidate the resources selfie when forcing the
update of any filter list.
With hindsight, I revised decisions made earlier during
this development cycle:
Un-redirectable scriptlets have been removed from
/web_accessible_resources and instead put in the new
/assets/resources/scriptlets.js, which contains all
scriptlets used for web page injection purpose.
uBO will no longer fetch a remote version of built-in
resources.
Advanced setting `userResourcesLocation` will still be
honoured by uBO, and if set, will be fetched every
time at least one asset is updated.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/651
The `behnind-the-scene` context was wrongly used to
evaluate the whitelist status of the context of tabless
network requests. The document origin must be used
instead when it's available.
Additionally, much code has been revisited for better
ES6 syntax compliance.
The goal is to be able to specify a scriptlet token
without the `.js` part at the end, because that part
is essentially redundant with the `+js` part of
the syntax.
When the next stable release is in widespread use
(to determine), scriptlet tokens will have to be
specified without the `.js` part, and with this
commit the logger will already report the normalized
version of scriptlets.
Eventually, when the migration to sans-`.js` is
complete (also to determine), the internal
normalization of the token will be removed and this
will become official syntax.
Filter list maintainers will have to mind that
uAssets is becoming in use beyond uBO (i.e. Brave)
when skipping the `.js` part -- hopefully Brave will
go along with the change here, which is to remove a
bit of tediousness for filter list maintainers.
This is a first step, the ultimate goal is to remove
the need for resources.txt, or at least to reduce to
only hotfixes or for trivial resources targeting very
specific websites.
Most resources will become immutable, i.e. they will
be part of uBO's code base. Advantages include easier
code maintenance (jshint, syntax highlight), and to
make scriptlets more easy to code review by external
parties (for example extension store reviewers).
TODO:
- More scriptlets need to be imported before next
release.
- Need to make legacy versions of uBO use a legacy
version of resources.txt, as all the now obsolete
scriptlets will have to be removed once uBO's
next release become widespread.
- Possibly need to add code to load binary
resources so that they can be injected as
data: URI. So far it's unclear whether this is
really needed. For example, this would be needed
if a xmlhttprequest is redirected to an image
resource.
This works only for platforms supporting the return of
Promise by network listeners, i.e. only Firefox at this
point.
When filter lists are reloaded[1], there is a small
time window in which some network requests which should
have normally been blocked are not being blocked
because the static network filtering engine may not
have yet loaded all the filters in memory
This is now addressed by suspending the network request
handler when filter lists are reloaded -- again, this
works only on supported platforms.
[1] Examples: when a filter list update session
completes; when user filters change, when
adding/removing filter lists.
Related discussion:
- https://www.reddit.com/r/uBlockOrigin/comments/c5do7w/
Make the element picker better reflect network filters as
parsed by the static network filtering engine. Additionally,
discard single alphanumeric character-based filters.
Related discussion:
- https://www.reddit.com/r/uBlockOrigin/comments/c62irc/
Inject newly created cosmetic filters into the DOM
filterer, in order for these filters to be enforced by
the DOM filterer in subsequent dynamic DOM changes.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/371
By default, no specific keyboard shortcut is predefined,
this will have to be assigned by the user. The command
name in English is "Toggle blocking profile".
The default behavior is to toggle down according to one
of the following scenarios.
a) If script execution is disabled through the no-scripting
switch, the no-scripting switch will be locally toggled
so as to allow script execution. The page will be
automatically reloaded.
b) If script execution is not blocked but the 3rd-party
script and/or frame cells are blocked, local no-op rules
will be set so as to no longer block 3rd-party scripts
and/or frames. The page will be automatically reloaded.
Given this, it may take more than one toggle down command
to reach the lowest blocking profile, which is one where
JavaScript execution is not blocked and 3rd-party scripts
and frames resources block rules, if any, are bypassed
with local no-op rules.
TODO: At this point, I haven't yet decided whether
toggling from the lowest profile should restore the
original highest blocking profile.
Related discussion:
- https://www.reddit.com/r/uBlockOrigin/comments/c5do7w/
Fixed:
- Expect the differ can return the first input as is when
there is no difference between the two items.
- Better deal with extraneous whitespaces in `srcset`
The purpose is to avoid having to iterate through
all input nodes at each operator implementation
level. The `transpose` method deals with only one
input node, and the iteration is performed by the
main procedural filtering entry points.
Additionally:
- Add `:spath` to HTML filtering
- Rename `:watch-attrs` to `:watch-attr`
- `:watch=attrs` is deprecated and will be kept around
until it is safe to remove it completely
Where `x` is the minimal text length of the subject
DOM element. DOM elements whose text length is
greater than or equal to `x` will be selected.
The original rationale for such procedural cosmetic
operator[1] is to be able to remove inline script
elements according to a minimum text length using
HTML filtering.
[1] As a result of internal discussion with filter
list maintainers @ uAssets.
- Remove HNTrieContainer class from global context by
storing it as a property of µBlock.
- Use block scope to isolate HNTrie-related constants
from global context.
- Prevent filters which are pure IP address from
being stored in an HNTrie instance -- as this
could cause false positives.
The bidirectional trie allows storing the right
and left parts of a string into a trie given a
pivot position.
Releated issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/528
Additionally, the mandatory token-at-index-0 rule
for FilterPlainHnAnchored has been lifted, thus
allowing the engine to pick a potentially better token
at any position in the filter string.
***
TODO: Eventually rename `strie.js` to `biditrie.js`.
TODO: Fix dump() method, it currently only show the
right-hand side of a filter string.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/610
The service worker-related issue affects both
Chromium/Firefox: the type of resources fetched
from a service worker are uniformly set to
`xmlhttprequest`, hence losing a key piece of
information for the purpose of accurate content
filtering.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/591
Additionally, I added a link to the logger in the
"About" pane in the dashboard in order to be able
to access the logger without having to go through
the popup panel.
Related issue:
- https://github.com/gorhill/uBlock/issues/983
- https://github.com/gorhill/uBlock/issues/1353
The current implementation reports statistics for all
static filters, and the presentation/featureset is
intentionally minimal: *Do not open issues about this.*
It's still a work in progress and it will be worked on
slowly and thoughtfully over time and as time allows.
Pausing the logger will not pause the collation of
filter hit statistics, thus it is possible to lower
the logger overhead by pausing logger output without
losing filter hit collation.
The motivations for the re-arrangement:
- Reducing the number of entry points:
matchStringExactString() has been removed and
matchString() is simply reused with a modifier parameter
to enable matching variants.
- Presumption that most matches, if any, occur early with
the left-most tokens in a URL. This gives a very small
marginal performance gain as per built-in benchmark.
Related discussion:
- https://www.reddit.com/r/uBlockOrigin/comments/bqnsoa/
The `all` option is equivalent to specifying all
network-based types + `popup`, `document`,
`inline-font`, `inline-script`.
Example from discussion:
||bet365.com^$all
Above will block all network requests, block all popups,
prevent inline fonts/scripts from `bet365.com`. EasyList-
compatible syntax does not allow to accomplish that
semantic when using only `||bet365.com^`.
If using specific negated type options along with `all`,
the order in which the options appear is important. In
such case `all` should always be first, followed by
the negated type option(s).
Related issue:
- https://github.com/gorhill/uBlock/issues/2394
Additionally, I added a new advanced setting to control
how long after launch an auto-update session should be
started -- value is in seconds:
autoUpdateDelayAfterLaunch 180
Related issue:
- https://github.com/gorhill/uBlock/issues/3271
When navigating away by clicking another pane tab button,
there will be an embedded warning, which can be ignore
in order to proceed to the new pane, or dismissed by
either clicking on the "Stay" button or anywhere else
in the dashboard.
When navigating away by trying to close the tab, there will
be a built-in browser warning asking for confirmation.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/131
The new advanced setting and its default value is:
allowGenericProceduralFilters false
Whenever this setting is toggled, the user is responsible
of forcing a reload of all filter lists so as to allow uBO
to process differently any existing generic procedural
cosmetic filters.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/214
Built-in whitelist directives are now rendered differently
than user-defined whitelist directives. Also, removing a
built-in whitelist directive will only cause that directive
to be commented out, so that users do not have to remember
built-in directives should they want to bring them back.
Related issue:
https://github.com/uBlockOrigin/uBlock-issues/issues/494
The built-in per-site switch rule
`no-scripting: behind-the-scene false` has been removed,
it should not ever be needed since there will always be a
valid root context for main- and sub-frames.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/551
The issue fixes previewing the hiding/unhiding of targeted
elements in the element picker.
However it does not address the case of previewing
`:style(...)` operators -- this would require a much
more complex fix, which I am not sure is worth the
amount of work and increased code complexity.
Related issue:
- https://github.com/gorhill/uBlock/issues/127
Additionally, the extended exception filters in the
logger will be rendered with a line-through to more
easily distinguish them from non-exception ones.
Also, opportunistically converted revisited code to
ES6 syntax.
This was a TODO item:
- 07cbae66a4/src/js/cosmetic-filtering.js (L375)
µBlock.staticExtFilteringEngine.HostnameBasedDB has been
re-factored to accomodate the storing of specific cosmetic
filters.
As a result of this refactoring:
- Memory usage has been further decreased
- Performance of selector retrieval marginally
improved
- New internal representation opens the door
to use a specialized version of HNTrie, which
should further improve performance/memory
usage
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/572
Wildcards are now allowed in the hostname part of redirect
filters. There will be an attempt to find the longest
right-hand portion of the hostname with no wildcard. If
no non-empty hostname can be extracted, `*` will be used.
To be used at the console, as an investigation tool for
development purpose.
Using it to verify the content of the largest
FilterHostnameDict instance, I spotted an all-uppercase
hostname in the HNTrieRef instance:
µBlock.staticNetFilteringEngine.categories.get(0).get(0x10000000).dict.dump();
Thus the changes to static-net-filtering.js are to fix
the erroneous insertion of filters with uppercase
characters. The single instance found was a hostname entry
in Malware Domain List (TRIANGLESERVICESLTD dot COM).
The `null` placeholder are not necessary, we can just use
default arguments instead, and add the HNTrieContainer
references if and only if they are instanciated.
Related issue:
- https://github.com/uBlockOrigin/uBlock-issues/issues/550
Related Chromium issue (I can't access it):
- https://bugs.chromium.org/p/chromium/issues/detail?id=957866
Findings so far: affects browsers based on Chromium 74.
I could not reproduce the issue with either Chromium 73 or
Google Chrome 75.
This commit is a mitigation: to prevent sites from using
uBO's internal WAR secret for tracking purpose. A secret
can be used for at most one second, after which a new secret
is generated.
The original issue related to the implementation of
secret-gated web accessible resources is:
- https://github.com/gorhill/uBlock/issues/2823
The purpose of this new `:nth-ancestor(n)` operator is to
lookup the nth ancestor relative to the currently selected
node.
It is essentially equivalent to `:xpath(..)`, where
ancestor distance is expressed as a number rather than a
sequence of slash-separated `..`.
The rationale to introduce this new procedural selector
is to have a low overhead way to accomplish ancestor
selection.
This commit implements the alphabetical ordering of HNTrie
nodes, so as to make it possible to bail out early at
HNTrie.matches() time.
Contrary to what I expected, there is no performance gain
observed to HNTrie.matches() as per benchmarks -- I find
the results perplexing.
Because of this I will revert this commit immediately.
The purpose of this commit is to record the changes so
that I can bring them back to life in the future whenever
I want to investigate further.
Consider the two following filters:
example.com
www.example.com
This commit make it so that if the first filter is
already present in a given HNTrie, the second filter
will not be stored, since HNTrie will _always_
return the first filter as a match whenever the
hostname to match is example.com or any subdomain
of example.com.
The detection of such pointless filters is
virtually free when adding a hostname to an HNTrie
instance (given how data is stored in the trie), so
in practice no overhead is incurred to detect such
pointless filters.
The ability to ignore impossible to match filters
in HNTrie instances will _especially_ benefit those
using large hosts files.
Examples of how this helps using real configurations:
- Default lists:
444 filters out of 100,382 were ignored as a result
of this commit.
- Default lists + "Energized Ultimate Protection":
283,669 filters out of 903,235 were ignored as a
result of this commit.
Side note: There was no measurable difference between
the two configurations above in the performance of
the matching algorithm as reported by the built-in
benchmark tool.
The staticNetFilteringEngine uses token hashes to store/lookup
filters into Map objects.
Before this commit, the tokens were encoded into token hashes
as JS numbers (not exceeding MAX_SAFE_INTEGER) using at most
the 8 first characters of the token.
With this commit, token hashes are now restricted to fit
into 32-bit integers, and are derived from at most the 7 first
characters. This improves filter look-up performance as per
built-in benchmark().
Related commit:
- 69a43e07c4
Using 32 bits of token hash rather than just the 16 lower
bits does help discard more unknown tokens.
Using the default filter lists, the known-token lookup
table is populated by 12,276 entries, out of 65,536, thus
making the case that theoretically there is a lot of
possible tokens which can be discarded.
In practice, running the built-in
staticNetFilteringEngine.benchmark() with default filter
lists, I find that 1,518,929 tokens were skipped out of
4,441,891 extracted tokens, or 34%.
Related commit:
- 3f3a1543ea
The regression was preventing uBO to find from which list a filter
originated. This affected only filters for which the `domain=`
option had multiple hostnames.
Given that all tokens extracted from one single URL are potentially
iterated multiple times in a single URL-matching cycle, it pays to
ignore extracted tokens which are known to not be used anywhere in
the static filtering engine.
The gain in processing a single network request in the static
filtering engine can become especially high when dealing with
long and random-looking URLs, which URLs have a high likelihood
of containing a majority of tokens which are known to not be in
use.
Related commit:
- 99390390fc
The token information available at compile time can be stored
in the filter to be used at match() time. This allows the use of
startsWith() rather than a more costly indexOf() call as a first
quick test to detect mismatches.
Due to how web pages typically load secondary resources and due
to how HNTrieContainer instances are used in uBO, there is a
great likelihood that the result of a previous call to
HNTrieRef.matches() can be reused in a subsequent call.
This has been confirmed by instrumenting HNTrieRef.matches().
Since uBO uses distinct HNTrieContainer instances to either
match against the request or the origin hostnames, this
means a high likelihood of repeated calls to HNTrieRef.matches()
with the same hostname as argument, hence a performance gain
when caching the argument+result -- as despite that
HNTrie.matches() is fast, comparing two short strings is even
faster if this allows to skip HNTrie.matches() altogether.
Performance- and memory-related work. Three more classes have
been created to avoid regex-based filters internally.
Purpose is to enforce filters which have only one single
wildcard in their pattern, a common occurrence. The filter
pattern is split in two literal string segments.
Similar as above, with the added condition that the filter is
hostname-anchored (`||`). The "Wildcard2" variant is a further
specialization to enforce filters where the only wildcard
is immediately preceded by the `^` special character, again
a very common occurrence.
Using two literal string segments in lieu of regexes allows to
quickly detect a mismatch by just testing the first segment.
Additionally, this reduces memory footprint as regexes are
much more expensive memory-wise than plain strings.
These three new filter classes allow to replace the use of
5276 regex-based filters internally with plain string-based
filters.
Often-called isHnAnchored() has been further fine-tuned to
avoid as much work as possible. I have also observed that
using an arrow function for closure-purpose helps measurably
performance, as per built-in benchmark.
