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Put Tinter loop body in a try/catch

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So whatever other random ways this process fails in don't cause it
to take out the whole app.
This commit is contained in:
David Baker 2018-04-11 18:31:54 +01:00
parent 91024007aa
commit dbed29a7cc
1 changed files with 52 additions and 44 deletions
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96
src/Tinter.js
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@ -298,58 +298,66 @@ class Tinter {
for (let i = 0; i < document.styleSheets.length; i++) {
const ss = document.styleSheets[i];
if (!ss) continue; // well done safari >:(
// Chromium apparently sometimes returns null here; unsure why.
// see $14534907369972FRXBx:matrix.org in HQ
// ...ah, it's because there's a third party extension like
// privacybadger inserting its own stylesheet in there with a
// resource:// URI or something which results in a XSS error.
// See also #vector:matrix.org/$145357669685386ebCfr:matrix.org
// ...except some browsers apparently return stylesheets without
// hrefs, which we have no choice but ignore right now
try {
if (!ss) continue; // well done safari >:(
// Chromium apparently sometimes returns null here; unsure why.
// see $14534907369972FRXBx:matrix.org in HQ
// ...ah, it's because there's a third party extension like
// privacybadger inserting its own stylesheet in there with a
// resource:// URI or something which results in a XSS error.
// See also #vector:matrix.org/$145357669685386ebCfr:matrix.org
// ...except some browsers apparently return stylesheets without
// hrefs, which we have no choice but ignore right now
// XXX seriously? we are hardcoding the name of vector's CSS file in
// here?
//
// Why do we need to limit it to vector's CSS file anyway - if there
// are other CSS files affecting the doc don't we want to apply the
// same transformations to them?
//
// Iterating through the CSS looking for matches to hack on feels
// pretty horrible anyway. And what if the application skin doesn't use
// Vector Green as its primary color?
// --richvdh
// XXX seriously? we are hardcoding the name of vector's CSS file in
// here?
//
// Why do we need to limit it to vector's CSS file anyway - if there
// are other CSS files affecting the doc don't we want to apply the
// same transformations to them?
//
// Iterating through the CSS looking for matches to hack on feels
// pretty horrible anyway. And what if the application skin doesn't use
// Vector Green as its primary color?
// --richvdh
// Yes, tinting assumes that you are using the Riot skin for now.
// The right solution will be to move the CSS over to react-sdk.
// And yes, the default assets for the base skin might as well use
// Vector Green as any other colour.
// --matthew
// Yes, tinting assumes that you are using the Riot skin for now.
// The right solution will be to move the CSS over to react-sdk.
// And yes, the default assets for the base skin might as well use
// Vector Green as any other colour.
// --matthew
// stylesheets we don't have permission to access (eg. ones from extensions) have a null
// href and will throw exceptions if we try to access their rules.
if (!ss.href || !ss.href.match(new RegExp('/theme-' + this.theme + '.css$'))) continue;
if (ss.disabled) continue;
if (!ss.cssRules) continue;
// stylesheets we don't have permission to access (eg. ones from extensions) have a null
// href and will throw exceptions if we try to access their rules.
if (!ss.href || !ss.href.match(new RegExp('/theme-' + this.theme + '.css$'))) continue;
if (ss.disabled) continue;
if (!ss.cssRules) continue;
if (DEBUG) console.debug("calcCssFixups checking " + ss.cssRules.length + " rules for " + ss.href);
if (DEBUG) console.debug("calcCssFixups checking " + ss.cssRules.length + " rules for " + ss.href);
for (let j = 0; j < ss.cssRules.length; j++) {
const rule = ss.cssRules[j];
if (!rule.style) continue;
if (rule.selectorText && rule.selectorText.match(/#mx_theme/)) continue;
for (let k = 0; k < this.cssAttrs.length; k++) {
const attr = this.cssAttrs[k];
for (let l = 0; l < this.keyRgb.length; l++) {
if (rule.style[attr] === this.keyRgb[l]) {
this.cssFixups[this.theme].push({
style: rule.style,
attr: attr,
index: l,
});
for (let j = 0; j < ss.cssRules.length; j++) {
const rule = ss.cssRules[j];
if (!rule.style) continue;
if (rule.selectorText && rule.selectorText.match(/#mx_theme/)) continue;
for (let k = 0; k < this.cssAttrs.length; k++) {
const attr = this.cssAttrs[k];
for (let l = 0; l < this.keyRgb.length; l++) {
if (rule.style[attr] === this.keyRgb[l]) {
this.cssFixups[this.theme].push({
style: rule.style,
attr: attr,
index: l,
});
}
}
}
}
} catch (e) {
// Catch any random exceptions that happen here: all sorts of things can go
// wrong with this (nulls, SecurityErrors) and mostly it's for other
// stylesheets that we don't want to proces anyway. We should not propagate an
// exception out since this will cause the app to fail to start.
console.log("Failed to calculate CSS fixups for a stylesheet: " + ss.href, e);
}
}
if (DEBUG) {