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Merge pull request #1 from ronanru/main

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Make the extension work for users outside of US
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Bryce Bostwick 2025-02-16 07:58:10 -08:00 • committed by GitHub
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1 changed files with 31 additions and 11 deletions
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42
gulf.js
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@ -1,5 +1,4 @@
(() => {
/**
* The functions we're patching are available globally on the variable named `_`,
* but they have computer-generated names that change over time
@ -10,7 +9,7 @@
* on the actual contents of the function. This relies on calling
* `toString()` on each function and seeing if it matches a
* pre-defined version. This function returns the name of a function
* matching that pre-defined versoin.
* matching that pre-defined version.
*
* This sounds awful, and maybe is, but the functions we're patching
* are super short, and don't depend on any other computer-generated
@ -35,7 +34,7 @@
JSON-parsing related utility. This function
is used in a couple places, one of them being parsing
of JSON API requests. It's not the most direct place
to hook, but it is probably the most convinient
to hook, but it is probably the most convenient
(meaning it is a global function that's close in
execution to the spot we want to modify, without
any other dependencies)
@ -54,7 +53,7 @@
and then calls out to the original function.
*/
_[jsonParsingFunctionName] = function(a, b) {
a = a.replaceAll('Gulf of America', 'Gulf of Mexico');
a = a.replaceAll(' (Gulf of America)', "").replaceAll('Gulf of America', 'Gulf of Mexico')
return originalJsonParsingFunction(a, b)
}
@ -74,7 +73,7 @@
Like the first function we're hooking, this one is not
the most direct spot to hook (this one's not even)
directly text-processing-related, but it is the most convinient.
directly text-processing-related, but it is the most convenient.
We hook this method in order to inspect the value returned
by one of its functions. This value contains binary data
@ -121,7 +120,7 @@
}
/**
* Looks for "Gulf of America" in the given byte array and patches any occurances
* Looks for "Gulf of America" in the given byte array and patches any occurrences
* in-place to say "Gulf of Mexico" (with a trailing null byte, to make the strings
* the same size).
*
@ -139,7 +138,10 @@
// Constants for special cases
const CHAR_CODE_SPACE = " ".charCodeAt(0)
const CHAR_CODE_CAPITAL_A = "A".charCodeAt(0)
const REPLACEMENT_BYTES = [..."Mexico\0"].map(char => char.charCodeAt(0))
const CHAR_CODE_PARENTH = '('.charCodeAt(0)
const CHAR_CODE_CAPITAL_G = 'G'.charCodeAt(0)
// \u200B is a zero-width space character. We add it to make the strings the same length
const REPLACEMENT_BYTES = [..."Mexico\u200B"].map(char => char.charCodeAt(0))
// For every possible starting character in our `labelBytes` blob...
for(let labelByteStartingIndex = 0; labelByteStartingIndex < labelBytes.length; labelByteStartingIndex++) {
@ -197,10 +199,28 @@
// (we can't just add a fixed value because we don't know how long the
// match even is, thanks to variable space matching)
const americaStartIndex = labelBytes.indexOf(CHAR_CODE_CAPITAL_A, labelByteStartingIndex)
// Replace "America" with "Mexico\0"
for (let i = 0; i < REPLACEMENT_BYTES.length; i++) {
labelBytes[americaStartIndex + i] = REPLACEMENT_BYTES[i];
let parenthStartIndex = -1;
// Check if the label is `Gulf of Mexico (Gulf of America)`
for (let i = 0; i < labelBytes.length; i++) {
if (labelBytes[i] == CHAR_CODE_PARENTH && labelBytes[i + 1] == CHAR_CODE_CAPITAL_G) {
parenthStartIndex = i
break
}
}
if (parenthStartIndex > -1) {
// Replace "(Gulf of" with zero-width spaces
for (let i = 0; i < 8; i++) {
labelBytes[parenthStartIndex + i] = '\u200B'.charCodeAt(0)
}
// Replace "America)" with zero-width spaces
for (let i = 0; i < 8; i++) {
labelBytes[americaStartIndex + i] = '\u200B'.charCodeAt(0)
}
} else {
// Replace "America" with "Mexico\u200B"
for (let i = 0; i < REPLACEMENT_BYTES.length; i++) {
labelBytes[americaStartIndex + i] = REPLACEMENT_BYTES[i]
}
}
}