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firefox: support setting search engine & adding custom engines
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With this change, it's now possible to configure the default search
engine in Firefox with
`programs.firefox.profiles.<name>.search.default` and add custom
engines with `programs.firefox.profiles.<name>.search.engines`.

It's also recommended to enable
`programs.firefox.profiles.<name>.search.force = true` since Firefox
will replace the symlink for the search configuration on every launch,
but note that you'll loose any existing configuration by enabling this.
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@kira-bruneau
kira-bruneau committed May 31, 2022
1 parent 64831f9 commit 19c0bd4
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Showing 5 changed files with 354 additions and 1 deletion.
6 changes: 6 additions & 0 deletions modules/lib/maintainers.nix
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Expand Up @@ -89,6 +89,12 @@
fingerprint = "2BE3 BAFD 793E A349 ED1F F00F 04D0 CEAF 916A 9A40";
}];
};
kira-bruneau = {
name = "Kira Bruneau";
email = "[email protected]";
github = "kira-bruneau";
githubId = 382041;
};
kubukoz = {
name = "Jakub Kozłowski";
email = "[email protected]";
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13 changes: 13 additions & 0 deletions modules/misc/news.nix
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Expand Up @@ -2479,6 +2479,19 @@ in
A new module is available: 'services.mopidy'.
'';
}
{
time = "2022-05-29T00:13:32+00:00";
message = ''
It's now possible to configure the default search engine in Firefox
with `programs.firefox.profiles.<name>.search.default` and add custom
engines with `programs.firefox.profiles.<name>.search.engines`.
It's also recommended to enable
`programs.firefox.profiles.<name>.search.force = true` since Firefox
will replace the symlink for the search configuration on every launch,
but note that you'll loose any existing configuration by enabling this.
'';
}
];
};
}
208 changes: 207 additions & 1 deletion modules/programs/firefox.nix
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Expand Up @@ -86,7 +86,7 @@ let
'';

in {
meta.maintainers = [ maintainers.rycee ];
meta.maintainers = [ maintainers.rycee maintainers.kira-bruneau ];

imports = [
(mkRemovedOptionModule [ "programs" "firefox" "enableAdobeFlash" ]
Expand Down Expand Up @@ -283,6 +283,94 @@ in {
defaultText = "true if profile ID is 0";
description = "Whether this is a default profile.";
};

search = mkOption {
type = types.submodule {
options = {
force = mkOption {
type = with types; bool;
default = false;
description = ''
Whether to force replace the existing search
configuration. This is recommended since Firefox will
replace the symlink for the search configuration on every
launch, but note that you'll loose any existing
configuration by enabling this.
'';
};

default = mkOption {
type = with types; nullOr str;
default = null;
example = "DuckDuckGo";
description = ''
The default search engine used in the address bar and search bar.
'';
};

order = mkOption {
type = with types; uniq (listOf str);
default = [ ];
example = ''
[ "DuckDuckGo" "Google" ]
'';
description = ''
The order the search engines are listed in. Any engines
that aren't included in this list will be listed after
these in an unspecified order.
'';
};

engines = mkOption {
type = with types;
attrsOf (attrsOf (pkgs.formats.json { }).type);
default = { };
example = literalExpression ''
{
"Nix Packages" = {
urls = [{
template = "https://search.nixos.org/packages";
params = [
{ name = "type"; value = "packages"; }
{ name = "query"; value = "{searchTerms}"; }
];
}];
icon = "''${pkgs.nixos-icons}/share/icons/hicolor/scalable/apps/nix-snowflake.svg";
definedAliases = [ "@np" ];
};
"NixOS Wiki" = {
urls = [{ template = "https://nixos.wiki/index.php?search={searchTerms}"; }];
iconUpdateURL = "https://nixos.wiki/favicon.png";
updateInterval = 24 * 60 * 60 * 1000; # every day
definedAliases = [ "@nw" ];
};
"Bing".metaData.hidden = true;
"Google".metaData.alias = "@g"; # builtin engines only support specifying one additional alias
}
'';
description = ''
Attribute set of search engine configurations.
Engines that only have metaData specified will be
treated as builtin to Firefox.
See <link xlink:href=
"https://searchfox.org/mozilla-central/rev/669329e284f8e8e2bb28090617192ca9b4ef3380/toolkit/components/search/SearchEngine.jsm#1138-1177"
> SearchEngine.jsm </link> in Firefox's source for
available options. We maintain a mapping to let you specify
all options in the referenced link without underscores,
but it may fall out of date with future options.
icon is also a special option added by home-manager to
make it convenient to specify absolute icon paths.
'';
};
};
};
default = { };
};
};
}));
default = { };
Expand Down Expand Up @@ -376,6 +464,124 @@ in {
mkUserJs profile.settings profile.extraConfig profile.bookmarks;
};

"${profilesPath}/${profile.path}/search.json.mozlz4" = mkIf
(profile.search.default != null || length profile.search.order != [ ]
|| profile.search.engines != { }) {
force = profile.search.force;
source = let
settings = {
version = 6;

engines = let
allEngines = (profile.search.engines //
# If search.default isn't in search.engines, assume it's
# app provided and include it in the set of all engines
optionalAttrs (profile.search.default != null
&& !(hasAttr profile.search.default
profile.search.engines)) {
${profile.search.default} = { };
});

# Map allEngines to a list and order by search.order
orderedEngineList = (imap (order: name:
let engine = (allEngines.${name} or { });
in engine // {
inherit name;
metaData = (engine.metaData or { }) // { inherit order; };
}) profile.search.order) ++ (mapAttrsToList
(name: config: config // { inherit name; })
(removeAttrs allEngines profile.search.order));

engines = map (config:
let
name = config.name;
isAppProvided = (removeAttrs config [ "name" "metaData" ])
== { };
metaData = config.metaData or { };
in mapAttrs' (name: value: {
# Map nice field names to internal field names.
# This is intended to be exhaustive, but any future fields
# will either have to be specified with an underscore,
# or added to this map.
name = {
name = "_name";
isAppProvided = "_isAppProvided";
loadPath = "_loadPath";
hasPreferredIcon = "_hasPreferredIcon";
searchForm = "__searchForm";
updateInterval = "_updateInterval";
updateURL = "_updateURL";
iconUpdateURL = "_iconUpdateURL";
iconURL = "_iconURL";
iconMapObj = "_iconMapObj";
metaData = "_metaData";
orderHint = "_orderHint";
definedAliases = "_definedAliases";
urls = "_urls";
}.${name} or name;

inherit value;
}) ((removeAttrs config [ "icon" ])
// (optionalAttrs (!isAppProvided)
(optionalAttrs (config ? iconUpdateURL) {
# Convenience to default iconURL to iconUpdateURL so
# the icon is immediately downloaded from the URL
iconURL = config.iconURL or config.iconUpdateURL;
} // optionalAttrs (config ? icon) {
# Convenience to specify absolute path to icon
iconURL = "file://${config.icon}";
} // {
# Required for custom engine configurations,
# loadPaths are unique identifiers that are generally
# formatted like: [source]/path/to/engine.xml
loadPath = ''
[home-manager]/programs.firefox.profiles.${profile.name}.search.engines."${
replaceChars [ "\\" ] [ "\\\\" ] name
}"'';
})) // {
# Required fields for all engine configurations
inherit name isAppProvided metaData;
})) orderedEngineList;
in engines;

metaData = optionalAttrs (profile.search.default != null) {
current = profile.search.default;

# Hash algorithm from
# https://searchfox.org/mozilla-central/rev/de15f9c109f9c474d00faf8032f559c236067c06/toolkit/components/search/SearchUtils.jsm#312-334
hash = let
# home-manager doesn't circumvent user consent and isn't
# acting maliciously. We're modifying the search outside of
# Firefox, but a claim by Mozilla to remove this would be very
# anti-user, and is unlikely to be an issue for our use case.
disclaimer =
"By modifying this file, I agree that I am doing so "
+ "only within $appName itself, using official, user-driven search "
+ "engine selection processes, and in a way which does not circumvent "
+ "user consent. I acknowledge that any attempt to change this file "
+ "from outside of $appName is a malicious act, and will be responded "
+ "to accordingly.";

salt = profile.path + profile.search.default
+ (builtins.replaceStrings [ "$appName" ] [ "Firefox" ]
disclaimer);

hash = removeSuffix "\n" (builtins.readFile
(pkgs.runCommandNoCC "hash" { inherit salt; } ''
echo -n "$salt" | ${pkgs.openssl}/bin/openssl dgst -sha256 -binary | base64 > "$out"
''));
in hash;
} // {
useSavedOrder = profile.search.order != [ ];
};
};
in pkgs.runCommandNoCC "search.json.mozlz4" { } ''
${pkgs.mozlz4a}/bin/mozlz4a ${
pkgs.writeText "search.json" (builtins.toJSON settings)
} "$out"
'';
};

"${profilesPath}/${profile.path}/extensions" =
mkIf (cfg.extensions != [ ]) {
source = "${extensionsEnvPkg}/share/mozilla/${extensionPath}";
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75 changes: 75 additions & 0 deletions tests/modules/programs/firefox/profile-settings-expected-search.json
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@@ -0,0 +1,75 @@
{
"engines": [
{
"_definedAliases": [
"@np"
],
"_iconURL": "file:///run/current-system/sw/share/icons/hicolor/scalable/apps/nix-snowflake.svg",
"_isAppProvided": false,
"_loadPath": "[home-manager]/programs.firefox.profiles.search.search.engines.\"Nix Packages\"",
"_metaData": {
"order": 1
},
"_name": "Nix Packages",
"_urls": [
{
"params": [
{
"name": "type",
"value": "packages"
},
{
"name": "query",
"value": "{searchTerms}"
}
],
"template": "https://search.nixos.org/packages"
}
]
},
{
"_definedAliases": [
"@nw"
],
"_iconURL": "https://nixos.wiki/favicon.png",
"_iconUpdateURL": "https://nixos.wiki/favicon.png",
"_isAppProvided": false,
"_loadPath": "[home-manager]/programs.firefox.profiles.search.search.engines.\"NixOS Wiki\"",
"_metaData": {
"order": 2
},
"_name": "NixOS Wiki",
"_updateInterval": 86400000,
"_urls": [
{
"template": "https://nixos.wiki/index.php?search={searchTerms}"
}
]
},
{
"_isAppProvided": true,
"_metaData": {
"hidden": true
},
"_name": "Bing"
},
{
"_isAppProvided": true,
"_metaData": {},
"_name": "DuckDuckGo"
},
{
"_isAppProvided": true,
"_metaData": {
"alias": "@g"
},
"_name": "Google"
}
],
"metaData": {
"current": "DuckDuckGo",
"hash": "BWvqUiaCuMJ20lbymFf2dqzWyl1cgm1LZhhdWNEp0Cc=",
"useSavedOrder": true
},
"version": 6
}
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