Commit Graph

4774 Commits

Author SHA1 Message Date
David Taylor
a2f80670e1
FIX: Do not count youtube thumbnail when counting post images (#10049) 2020-06-15 20:25:30 +01:00
Arpit Jalan
a94387c088 FIX: check for inviter group permissions at the time of redeeming invite 2020-06-15 14:44:35 +05:30
Guo Xiang Tan
402b80f306
DEV: Make rails_failover compatible with SKIP_DB_AND_REDIS env. 2020-06-15 16:23:24 +08:00
Guo Xiang Tan
58e52c0e4f
DEV: Use rails_failover gem for ActiveRecord and Redis failover handling 2020-06-15 15:47:07 +08:00
Guo Xiang Tan
d8cd912769
DEV: Switch to db config to disable advisory locks. 2020-06-15 14:33:41 +08:00
Sam Saffron
7211394e4d
FEATURE: include tags in unread/new messages
We need this information to maintain counts on tracked/watched
tags.
2020-06-12 16:20:30 +10:00
Guo Xiang Tan
2fbd4eb11f
DEV: Remove double query in Group#remove_review_group.
Probably a mistake during commit.
2020-06-12 10:14:45 +08:00
Dan Ungureanu
b7e70850e4
FIX: Allow users to add emails which were deleted before 2020-06-11 14:54:11 +03:00
Sam Saffron
a26b490047
FIX: present correct new/unread counts when filtered by tag
Previously we would incorrectly ignore tags.

This ensures tracking state is properly shipped to client if
show_filter_by_tag is enabled.
2020-06-11 16:47:57 +10:00
Dan Ungureanu
5bfe1ee4f1
FEATURE: Improve UX support for multiple email addresses (#9691) 2020-06-10 19:11:49 +03:00
Dan Ungureanu
3a7ca97c36
FIX: Use include-subcategories filter in report export (#10007)
Some filters were renamed and the conversion of the filter names and arguments
was removed.
2020-06-10 18:57:39 +03:00
David Taylor
ae6c4cd237
FIX: Allow merging users when email domains are restricted 2020-06-09 18:51:59 +01:00
Arpit Jalan
3094459cd9
FEATURE: multiple use invite links (#9813) 2020-06-09 20:49:32 +05:30
Guo Xiang Tan
edc940ce3e
DEV: Fix incorrect messagebus redis config for rails_failover. 2020-06-09 17:05:14 +08:00
Gerhard Schlager
8c6a42c589 FIX: Redirects containing Unicode usernames didn't work 2020-06-08 10:26:29 +02:00
Vinoth Kannan
0f20a6f0aa FIX: use short_path of flair upload to get signed url for secure media.
If we use `upload.url` for secure urls then the images won't render.
2020-06-05 07:43:15 +05:30
Sam Saffron
57a3d4e0d2
FEATURE: whitelist theme repo mode (experimental)
In some restricted setups all JS payloads need tight control.

This setting bans admins from making changes to JS on the site and
requires all themes be whitelisted to be used.

There are edge cases we still need to work through in this mode
hence this is still not supported in production and experimental.

Use an example like this to enable:

`DISCOURSE_WHITELISTED_THEME_REPOS="https://repo.com/repo.git,https://repo.com/repo2.git"`

By default this feature is not enabled and no changes are made.

One exception is that default theme id was missing a security check
this was added for correctness.
2020-06-03 13:19:57 +10:00
Guo Xiang Tan
062db10c52
FIX: EmailValidator needs to validate format of email. 2020-06-03 10:34:37 +08:00
Guo Xiang Tan
439db7ca1e
DEV: Add REDIS_RAILS_FAILOVER env to test our new redis failover. 2020-06-02 17:24:14 +08:00
David Taylor
75b1298e99
DEV: Drop unused image_url column from posts and topics (#9953)
This has been superseded by image_upload_id. The image_url value in API responses is now generated dynamically from the upload record.
2020-06-02 16:21:38 +10:00
Guo Xiang Tan
7897010dfd
Fix lint. 2020-06-02 10:45:18 +08:00
Guo Xiang Tan
c21e3bbd1b
DEV: Prefer create! over create when not checking return value.
We don't want stuff to silently fail.
2020-06-02 10:34:05 +08:00
Penar Musaraj
fa6aa7f627
FIX: Digest frequency issue on user creation
If `default email digest frequency` was set to "Never", users would get
a `digest_after_minutes` set to `nil` which triggered this error
in the logs if/when the site eventually changed that setting and
enabled digests:

```
NoMethodError (undefined method `>=' for nil:NilClass)
/var/www/discourse/app/mailers/user_notifications.rb:227:in `digest'
```
2020-06-01 17:39:16 -04:00
Jarek Radosz
00aab49829
FIX: Restore the ability to rebake posts in deleted topics (#9951)
Lost in #9852
2020-06-01 07:04:16 +02:00
Mark VanLandingham
94cb5ab172
DEV: Remove unused variable topic_tracking_state (#9915) 2020-05-29 09:47:25 -05:00
David Taylor
28f46c171c
FIX: Pull hotlinked images even when edited by system users (#9890)
Previously the pull hotlinked images job was skipped after system edits. This ensured that we never had an infinite loop of system-edit/pull-hotlinked/system-edit/pull-hotlinked etc.

A side effect was that edits made by system for any other reason (e.g. API, removing full quotes) would prevent pulling hotlinked images. This commit removes the system edit check, and replaces it with another method to avoid an infinite job scheduling loop.
2020-05-29 13:07:47 +01:00
David Taylor
d29d69e10d
FIX: Invalidate database theme cache when hostname changes (#9908)
Hostname can vary per-site on a multisite cluster, so this change requires converting the compiler_version from a constant into a class method which is evaluated at runtime. The value is stored in the theme DistributedCache, so performance impact should be negligible.
2020-05-29 13:04:51 +01:00
Sam Saffron
2acec4370b
FIX: muted tags removed topics with no tags from counts
We previously did not account for completely untagged topics when
looking at muted tags, this caused new/unread counts to be off if

1. You had muted tags
2. You had an unread/new topic
3. This topic had no tags
2020-05-29 12:59:47 +10:00
Sam Saffron
136835370c
FEATURE: optionally allow tags in topic tracking state
This feature allows certain plugins to output tag information
to topic tracking state, this allows per tag stats which can be
used by sidebars and other plugins that need per tag stats

Not enabled by default cause this would add cost to a critical
query
2020-05-29 12:59:47 +10:00
Roman Rizzi
a41476800b
FIX: Don't raise an exception if a topic cannot be retrieved (#9906) 2020-05-28 11:59:20 -03:00
Guo Xiang Tan
8c86a109bb
DEV: Add ENV flag to test out ActiveRecord::Failover. 2020-05-28 16:24:22 +08:00
Joffrey JAFFEUX
77801aa9be
FIX: allows to have custom emoji translation without static file (#9893) 2020-05-27 20:11:52 +02:00
Roman Rizzi
461df7d050
UX: Rename Priority to score for sorting. (#9846) 2020-05-27 12:50:28 -03:00
Blake Erickson
da839e6d26 SECURITY: Use FinalDestination for topic embeds 2020-05-27 09:26:09 -06:00
Régis Hanol
2a4db15544 FIX: don't send digests to users with no primary email
It might happen that some User records have no associated primary emails.
In which case we don't ever want to send them a digest.

Also added a new "user_email_no_email" skipped email log to ensure these cases
are properly handled and surfaced.
2020-05-27 17:09:40 +02:00
Arpit Jalan
2152e70e0d DEV: annotate models 2020-05-27 19:05:24 +05:30
Joffrey JAFFEUX
1d685c22af
REVERT: removes translate_emoji (#9889)
This API is actually used in some plugins.
2020-05-27 12:08:24 +02:00
Bianca Nenciu
f47400475e
FEATURE: Send a private message when a group membership is accepted (#9822)
* FEATURE: Send a private message when a group membership is accepted

* DEV: Small code improvements

* FIX: Send PM as group owner

* Copy edits
2020-05-26 16:28:03 +03:00
Sam Saffron
76c4bc925d
DEV: followup to prev commit
337bd9a0f7 did not account for optimized image being nil
2020-05-26 16:19:05 +10:00
Sam Saffron
337bd9a0f7
FIX: concurrency bug when creating topic thumbnails
We were failing erratically when backfilling topic thumbnails.

This ensures that racing threads/processes will not conflict.
2020-05-26 16:10:22 +10:00
Osama Sayegh
2211581a85
FIX: Don't responde with error 500 if domain is invalid when adding automatic membership domain (#9655) 2020-05-26 15:40:09 +10:00
Arpit Jalan
5462fe9462
FIX: do not allow tag with name 'none' (#9867)
https://meta.discourse.org/t/none-tag-is-uneditable/152003
2020-05-26 08:15:45 +05:30
Guo Xiang Tan
878f06f1fe DEV: Remove custom connection reaper.
Rails 6 fixed the reaper to use one thread to reap all the connection pools.
2020-05-26 09:09:46 +08:00
Sam Saffron
fc97f7e0e7
FIX: properly ban non human users from draft system
Previously we had a partial fix in place where non human users
were not allowed draft sequences, this left edges around where non
human users asked for drafts yet had none.

For example system could already have a few drafts in place.

This also removes and extensibility point we added that is not in use
2020-05-26 10:07:09 +10:00
Vinoth Kannan
5fb9271878
DEV: ignore flair_url column in group model. (#9873) 2020-05-26 00:43:50 +05:30
Gerhard Schlager
631024ae5d FEATURE: Permalinks for tags 2020-05-25 14:51:01 +02:00
Sam Saffron
c011b817b2
FIX: do not fallback to flair_url column
flair_url is not loaded by our query anymore so avoid falling back
to the old value
2020-05-25 16:25:42 +10:00
Vinoth Kannan
8e56197728
UX: use "icon-picker" & "image-uploader" fields to set group flair. (#9779) 2020-05-25 11:08:47 +05:30
Gerhard Schlager
13d5ccedf5 FIX: Destroying a user failed when it had title
...because updating the user caused a validation of the primary email and the UserEmail records are already deleted at that time.
2020-05-24 22:14:50 +02:00
Michael Brown
d9a02d1336
Revert "Revert "Merge branch 'master' of https://github.com/discourse/discourse""
This reverts commit 20780a1eee.

* SECURITY: re-adds accidentally reverted commit:
  03d26cd6: ensure embed_url contains valid http(s) uri
* when the merge commit e62a85cf was reverted, git chose the 2660c2e2 parent to land on
  instead of the 03d26cd6 parent (which contains security fixes)
2020-05-23 00:56:13 -04:00
Jeff Atwood
20780a1eee Revert "Merge branch 'master' of https://github.com/discourse/discourse"
This reverts commit e62a85cf6f, reversing
changes made to 2660c2e21d.
2020-05-22 20:25:56 -07:00
Blake Erickson
03d26cd6f0 SECURITY: ensure embed_url contains valid http(s) uri 2020-05-22 14:54:56 -06:00
Roman Rizzi
671f882fa3
FIX: We don't create a Post object if the queued post gets rejected. We need to count review items directly. (#9856) 2020-05-22 11:50:28 -03:00
Martin Brennan
f9d55b4941
FEATURE: Update the topic excerpt when the OP is rebaked (#9852)
* We now have a site setting "topic_excerpt_maxlength" that is used when the OP is created or revised to generate a topic excerpt.
* However, posts created before this setting was introduced cannot benefit from this change unless they are revised, and if the topic excerpt length setting is changed that situation is also not covererd.
* This PR makes a change to rebake! to update the topic excerpt IF the post is the OP.
2020-05-22 13:04:15 +10:00
Martin Brennan
c0779df99d
FIX: Remove access control post FK from uploads (#9853) 2020-05-22 11:20:25 +10:00
Martin Brennan
df68d11c38
FEATURE: Add topic excerpt max length site setting (#9847)
Adds a new topic_excerpt_maxlength site setting.

* When topic excerpt is requested for a post, use the new topic_excerpt_maxlength site setting to limit the size of the excerpt
* Remove code for getting/setting Post.excerpt_size as it is not used anywhere
2020-05-21 13:19:48 +10:00
Robin Ward
096eca0ee8 FIX: Requests were not being logged correctly
`enable` was defaulting to `nil` which is not what we wanted.
2020-05-20 15:09:17 -04:00
Régis Hanol
8851b79472 DEV: less code for Category#url 2020-05-20 18:01:06 +02:00
Bianca Nenciu
fb15da43da
Remove old web hooks in favor of 'reviewable' web hook (#9776)
* FIX: Emit web hooks for flags

* FEATURE: Remove 'flag' web hook in favor of 'reviewable' web hook

* FEATURE: Remove 'queued post' web hook in favor of 'reviewable' web hook

* FIX: Do not set a default value for web hooks with no events
2020-05-20 12:07:48 +03:00
Guo Xiang Tan
f7f436e536
DEV: Install rails_failover gem to test our Redis changes. 2020-05-20 15:40:27 +08:00
Guo Xiang Tan
234cd5c3e7
FIX: Switch discobot to pull avatar from gravatar. 2020-05-20 10:20:08 +08:00
Sam Saffron
6b92c78033
FIX: purge all associated data on user delete
This commit reorganises the delete dependencies on users and make sure
all are covered. We forgot some on bookmarks, security keys, anon users
and so on.
2020-05-20 11:27:57 +10:00
Dan Ungureanu
05ca0c908f
FIX: GroupArchivedMessage belongs to Group, not User 2020-05-19 14:13:28 +03:00
David Taylor
725e38f9d7
DEV: Allow plugins to request topic thumbnail sizes (#9828)
In plugin.rb, you can register new sizes like

```
register_topic_thumbnail_size [512, 512]
```

For more information about thumbnails see 03818e642a
2020-05-19 10:38:58 +01:00
Gerhard Schlager
6d5e9db883 FIX: Restoring backup didn't clear cached translation overrides 2020-05-18 18:51:51 +02:00
Gerhard Schlager
27c611b1d1 FIX: Reverting multiple translation overrides didn't clear cache 2020-05-18 18:51:29 +02:00
David Taylor
f968155288
FIX: Ensure no image downloads during topic thumbnail serialization
If image uploads are missing a width/height, we re-download them to update the width/height in the database. However, this takes significant resources so we don't want to run this logic during topic serialization.
2020-05-18 12:04:29 +01:00
Guo Xiang Tan
d01c336899
DEV: Clean up some Redis leaks in test env. 2020-05-18 17:27:37 +08:00
David Taylor
461b4e5cc6
DEV: Add framework for filtered plugin registers (#9763)
* DEV: Add framework for filtered plugin registers

Plugins often need to add values to a list, and we need to filter those lists at runtime to ignore values from disabled plugins. This commit provides a re-usable way to do that, which should make it easier to add new registers in future, and also reduce repeated code.

Follow-up commits will migrate existing registers to use this new system

* DEV: Migrate user and group custom field APIs to plugin registry

This gives us a consistent system for checking plugin enabled state, so we are repeating less logic. API changes are backwards compatible
2020-05-15 14:04:38 +01:00
David Taylor
0495a748d0
FIX: Use CDN URLs for topic thumbnails 2020-05-15 13:35:20 +01:00
Sam Saffron
0cbaa8d813
FEATURE: extend duration allowed for download
Previously we would raise a warning in the logs if downloading
a file (from s3) takes longer than 60 seconds.

At scale this happens reasonably frequently.

1. Raised the duration to 3 minutes

2. Pulled the resizing mutex out of the downloading mutex
so we have less and clearer error logs
2020-05-15 12:45:47 +10:00
Guo Xiang Tan
165fa13c9d
FIX: Always return 0 for non-human user current DraftSequence. 2020-05-15 10:40:36 +08:00
Kane York
869f9b20a2
PERF: Dematerialize topic_reply_count (#9769)
* PERF: Dematerialize topic_reply_count

It's only ever used for trust level promotions that run daily, or compared to 0. We don't need to track it on every post creation.

* UX: Add symbol in TL3 report if topic reply count is capped

* DEV: Drop user_stats.topic_reply_count column
2020-05-14 15:42:00 -07:00
Mark VanLandingham
bec6bace53
DEV: Allow plugins to hide user stats by new guardian method (#9772) 2020-05-14 11:57:35 -05:00
Kane York
1059557ce1
DEV: Standardize ignored_columns removal comments (#9771) 2020-05-13 13:08:15 -07:00
Sam Saffron
7f841dc21f
PERF: avoid race conditions when creating topic links
Previously the code was very race condition prone leading to
odd failures in production

It was re-written in raw SQL to avoid conditions where rows
conflict on inserts

There is no clean way in ActiveRecord to do:

Insert, on conflict do nothing and return existing id.

This also increases test coverage, we were previously not testing
the code responsible for crawling external sites directly
2020-05-13 16:05:57 +10:00
Guo Xiang Tan
34c39b65bb
PERF: Avoid executing the same query twice. 2020-05-13 11:10:09 +08:00
Martin Brennan
9981fa4466
FIX: Prevent column name conflicts in reviewable code (#9753)
We were getting errors like this in Reviewables in some cases:

```
ActiveRecord::StatementInvalid (PG::AmbiguousColumn: ERROR:  column reference "category_id" is ambiguous
LINE 4: ...TRUE) OR (reviewable_by_group_id IN (NULL))) AND (category_i...
```

The problem that was making everything go boom is that plugins can add their own custom filters for Reviewables. If one is doing an INNER JOIN on topics, which has its own category_id column, we would get the above AmbiguousColumn error. The solution here is to just make all references to the reviewable columns in the list_for and viewable_by code prefixed by the table name e.g. reviewables.category_id.
2020-05-13 09:05:56 +10:00
Daniel Waterworth
497dc6eaa7 Add a global setting for CDN origin
This is so that, on a multisite cluster, when we handle a CDN request,
the hostname that is requested corresponds to one of the sites -
specifically the default site.
2020-05-12 16:43:40 +01:00
Robin Ward
088c11a12c FIX: Don't raise an exception if a TopicLink cannot be created
This can happen under concurrency and it's fine. If a `TopicLink`
already exists we can continue on without raising an error.
2020-05-12 11:15:59 -04:00
Sam Saffron
a29ae17d3a
FIX: saving drafts unconditionally increases sequence
Previously we only changed sequence on ownership change, this
cause a race condition between tabs where user could type for a
long time without being warned of an out of date draft.

This change is a radical change and we should watch closely.

Code was already in place to track sequence on the client so no
changes are needed there.
2020-05-12 16:55:42 +10:00
Guo Xiang Tan
8fb99f218d
FEATURE: Allow plugins to register a callback to ignore DraftSequence. 2020-05-12 14:25:20 +08:00
Guo Xiang Tan
d301af39bd
PERF: Avoid hitting DB when fetching draft sequence of bot user. 2020-05-12 13:56:58 +08:00
Bianca Nenciu
8149bfbaf1
FEATURE: Filter settings by plugin (#9692) 2020-05-10 14:07:45 +03:00
Robin Ward
b2e4ca968b DEV: Remove translate API from plugin.
It appears to be completely unused at this point.
2020-05-08 14:14:01 -04:00
Guo Xiang Tan
efd0e4d02b
FIX: Don't trigger user_updated event for bot users. 2020-05-08 09:28:16 +08:00
Martin Brennan
37be2958f7
DEV: Allow specifying if a notification is high_priority on create (#9660)
This allows for special cases where we may not want a certain notification type to ALWAYS be high priority (e.g. a topic timer).
2020-05-07 14:35:32 +10:00
Martin Brennan
6fb0f36ce1
FEATURE: Optionally delete bookmark when reminder sent (#9637)
We now show an options gear icon next to the bookmark name.

When expanded we show the "delete bookmark when reminder sent" option. The value of this checkbox is saved in local storage for the user.

If this is ticked, when a reminder is sent for the bookmark the bookmark itself is deleted. This is so people can use the reminder functionality by itself.

Also remove the blue alert reminder section from the "Edit Bookmark" modal as it just added clutter, because the user can already see they had a reminder set:

Adds a default false boolean column `delete_when_reminder_sent` to bookmarks.
2020-05-07 13:37:39 +10:00
Robin Ward
f5bdbd347e Revert "FIX: Discobot has not been created with our custom avatar."
This reverts commit 1062dbc3e9.

Looks like it's causing some errors on migration.

```
/var/www/discourse/lib/image_sizer.rb:6:in `resize'
/var/www/discourse/lib/upload_creator.rb:120:in `block in create_for'
/var/www/discourse/lib/distributed_mutex.rb:33:in `block in synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:29:in `synchronize'
/var/www/discourse/lib/distributed_mutex.rb:14:in `synchronize'
/var/www/discourse/lib/upload_creator.rb:37:in `create_for'
```
2020-05-06 11:28:42 -04:00
Martin Brennan
fa572d3a7a
DEV: Remove all code referencing at_desktop bookmark reminders (#9650)
We have found no need for these reminder types, so we are removing the code for them.
2020-05-06 15:22:43 +10:00
Guo Xiang Tan
1062dbc3e9 FIX: Discobot has not been created with our custom avatar.
Previously the image was imported from a Discourse hosted CDN but the
URL has since become invalid. However, it was not caught since all
errors are rescued. This commit fixes the issue by shipping the user
avatar with the plugin.
2020-05-06 09:25:01 +08:00
Robin Ward
612284cef3
DEV: Remove Discourse.RAW_TEMPLATES (#9630)
We were sharing `Discourse` both as an application object and a
namespace which complicated things for Ember CLI. This patch
moves raw templates into `__DISCOURSE_RAW_TEMPLATES` and adds
a couple helper methods to create/remove them.
2020-05-05 12:15:03 -04:00
David Taylor
03818e642a
FEATURE: Include optimized thumbnails for topics (#9215)
This introduces new APIs for obtaining optimized thumbnails for topics. There are a few building blocks required for this:

- Introduces new `image_upload_id` columns on the `posts` and `topics` table. This replaces the old `image_url` column, which means that thumbnails are now restricted to uploads. Hotlinked thumbnails are no longer possible. In normal use (with pull_hotlinked_images enabled), this has no noticeable impact

- A migration attempts to match existing urls to upload records. If a match cannot be found then the posts will be queued for rebake

- Optimized thumbnails are generated during post_process_cooked. If thumbnails are missing when serializing a topic list, then a sidekiq job is queued

- Topic lists and topics now include a `thumbnails` key, which includes all the available images:
   ```
   "thumbnails": [
   {
     "max_width": null,
     "max_height": null,
     "url": "//example.com/original-image.png",
     "width": 1380,
     "height": 1840
   },
   {
     "max_width": 1024,
     "max_height": 1024,
     "url": "//example.com/optimized-image.png",
     "width": 768,
     "height": 1024
   }
   ]
  ```

- Themes can request additional thumbnail sizes by using a modifier in their `about.json` file:
   ```
    "modifiers": {
      "topic_thumbnail_sizes": [
        [200, 200],
        [800, 800]
      ],
      ...
  ```
  Remember that these are generated asynchronously, so your theme should include logic to fallback to other available thumbnails if your requested size has not yet been generated

- Two new raw plugin outlets are introduced, to improve the customisability of the topic list. `topic-list-before-columns` and `topic-list-before-link`
2020-05-05 09:07:50 +01:00
Krzysztof Kotlarek
9bff0882c3
FEATURE: Nokogumbo (#9577)
* FEATURE: Nokogumbo

Use Nokogumbo HTML parser.
2020-05-05 13:46:57 +10:00
David Taylor
a51b8d9c66
FIX: Do not use cached settings during theme compilation
We compile within a database transaction, so using a cached value from redis can cause unwanted side effects
2020-05-04 09:43:06 +01:00
David Taylor
4f885d7da2
FIX: Clear theme caches after database transaction has committed
This was causing unusual side effects on high-traffic sites, where the cache would be rebuilt before the transaction had been committed
2020-05-04 09:42:50 +01:00
Kane York
784bf2a173
FIX: Unassign user titles when a badge is deleted (#9573) 2020-05-02 18:02:28 -07:00
Krzysztof Kotlarek
37e93914fc
FIX: the muted message should be sent after edit (#9593)
Recently, we added feature that we are sending `/muted` to users who muted specific topic just before `/latest` so the client knows to ignore those messages - https://github.com/discourse/discourse/pull/9482

Same `/muted` message should be included when the post is edited
2020-05-01 08:33:57 +10:00
Jeff Wong
2cb9e85d14
FEATURE: add category banner for why a user cannot post (#9576)
* FEATURE: add category banner for why a user cannot post

Adds a category banner for why a user is unable to post in a category.

Also adds an extra alert for the user when a user is unable to create a topic in a
category and they still try and click on the disabled-looking new topic
button.
2020-04-30 10:39:11 -07:00
Sam Saffron
d0d5a138c3
DEV: stop freezing frozen strings
We have the `# frozen_string_literal: true` comment on all our
files. This means all string literals are frozen. There is no need
to call #freeze on any literals.

For files with `# frozen_string_literal: true`

```
puts %w{a b}[0].frozen?
=> true

puts "hi".frozen?
=> true

puts "a #{1} b".frozen?
=> true

puts ("a " + "b").frozen?
=> false

puts (-("a " + "b")).frozen?
=> true
```

For more details see: https://samsaffron.com/archive/2018/02/16/reducing-string-duplication-in-ruby
2020-04-30 16:48:53 +10:00