1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
7 var EXPORTED_SYMBOLS = ["AsyncPrefs"];
9 const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
11 const kInChildProcess =
12 Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT;
14 const kAllowedPrefs = new Set([
15 // NB: please leave the testing prefs at the top, and sort the rest alphabetically if you add
17 "testing.allowed-prefs.some-bool-pref",
18 "testing.allowed-prefs.some-char-pref",
19 "testing.allowed-prefs.some-int-pref",
26 "reader.color_scheme",
27 "reader.content_width",
30 "security.tls.version.enable-deprecated",
33 const kPrefTypeMap = new Map([
34 ["boolean", Services.prefs.PREF_BOOL],
35 ["number", Services.prefs.PREF_INT],
36 ["string", Services.prefs.PREF_STRING],
39 function maybeReturnErrorForReset(pref) {
40 if (!kAllowedPrefs.has(pref)) {
41 return `Resetting pref ${pref} from content is not allowed.`;
46 function maybeReturnErrorForSet(pref, value) {
47 if (!kAllowedPrefs.has(pref)) {
48 return `Setting pref ${pref} from content is not allowed.`;
51 let valueType = typeof value;
52 if (!kPrefTypeMap.has(valueType)) {
53 return `Can't set pref ${pref} to value of type ${valueType}.`;
55 let prefType = Services.prefs.getPrefType(pref);
57 prefType != Services.prefs.PREF_INVALID &&
58 prefType != kPrefTypeMap.get(valueType)
60 return `Can't set pref ${pref} to a value with type ${valueType} that doesn't match the pref's type ${prefType}.`;
66 if (kInChildProcess) {
68 let gMsgMap = new Map();
72 let error = maybeReturnErrorForSet(pref, value);
74 return Promise.reject(error);
77 let msgId = ++gUniqueId;
78 return new Promise((resolve, reject) => {
79 gMsgMap.set(msgId, { resolve, reject });
80 Services.cpmm.sendAsyncMessage("AsyncPrefs:SetPref", {
89 let error = maybeReturnErrorForReset(pref);
91 return Promise.reject(error);
94 let msgId = ++gUniqueId;
95 return new Promise((resolve, reject) => {
96 gMsgMap.set(msgId, { resolve, reject });
97 Services.cpmm.sendAsyncMessage("AsyncPrefs:ResetPref", { pref, msgId });
101 receiveMessage(msg) {
102 let promiseRef = gMsgMap.get(msg.data.msgId);
104 gMsgMap.delete(msg.data.msgId);
105 if (msg.data.success) {
106 promiseRef.resolve();
108 promiseRef.reject(msg.data.message);
114 Services.cpmm.addMessageListener("AsyncPrefs:PrefSetFinished", AsyncPrefs);
115 Services.cpmm.addMessageListener("AsyncPrefs:PrefResetFinished", AsyncPrefs);
119 number: "setIntPref",
120 boolean: "setBoolPref",
121 string: "setCharPref",
125 let error = maybeReturnErrorForSet(pref, value);
127 return Promise.reject(error);
129 let methodToUse = this.methodForType[typeof value];
131 Services.prefs[methodToUse](pref, value);
132 return Promise.resolve(value);
135 return Promise.reject(ex.message);
140 let error = maybeReturnErrorForReset(pref);
142 return Promise.reject(error);
146 Services.prefs.clearUserPref(pref);
147 return Promise.resolve();
150 return Promise.reject(ex.message);
154 receiveMessage(msg) {
155 if (msg.name == "AsyncPrefs:SetPref") {
158 this.onPrefReset(msg);
163 let { pref, msgId } = msg.data;
164 this.reset(pref).then(
166 msg.target.sendAsyncMessage("AsyncPrefs:PrefResetFinished", {
172 msg.target.sendAsyncMessage("AsyncPrefs:PrefResetFinished", {
182 let { pref, value, msgId } = msg.data;
183 this.set(pref, value).then(
185 msg.target.sendAsyncMessage("AsyncPrefs:PrefSetFinished", {
191 msg.target.sendAsyncMessage("AsyncPrefs:PrefSetFinished", {
201 // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN nsBrowserGlue
202 Services.ppmm.addMessageListener("AsyncPrefs:SetPref", this);
203 Services.ppmm.addMessageListener("AsyncPrefs:ResetPref", this);
204 // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN nsBrowserGlue