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Louis Lam 2023-12-09 12:24:24 +08:00
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commit 4489c52488
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backend/envsubst.ts
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/*
* Original Source: https://github.com/inventage/envsubst/blob/main/src/utils.js
* MIT License
* Copyright (c) 2021 Inventage AG
*
* Copy this file, because
*/
import escapeStringRegexp from "escape-string-regexp";
import { LooseObject } from "./util-common";
const toLowerKeys = (object : LooseObject) => {
return Object.keys(object).reduce((accumulator : LooseObject, key) => {
accumulator[key.toLowerCase()] = object[key];
return accumulator;
}, {});
};
/**
* Regex pattern with an optional prefix.
*
* @see https://regex101.com/r/M3dVAW/1
* @param prefix
* @returns {string}
*/
const variableRegexPattern = (prefix = ""): string => {
return `\\\${(${prefix ? escapeStringRegexp(prefix) : ""}\\w+)(:-([^}]*))?}`;
};
/**
* Regex pattern that wraps the variable regex pattern with a window variable statement:
*
* window['${VAR}'] or window["${VAR}"]
*
* @see https://regex101.com/r/ND057d/1
* @param prefix
* @returns {string}
*/
const windowVariableRegexPattern = (prefix = ""): string => {
return `(window\\[['"]{1})?${variableRegexPattern(prefix)}(['"]{1}\\])?`;
};
/**
* Replaces all variable placeholders in the given string with either variable values
* found in the variables parameter OR with the given default in the variable string.
*
* @param {string} string
* @param {object} variables
* @param {string} prefix
* @param {boolean} trimWindow
* @param {boolean} ignoreCase
* @returns {Promise<unknown[]>}
*/
const replaceVariables = (string: string, variables: object = {}, prefix: string = "", trimWindow: boolean = false, ignoreCase: boolean = false): Promise<unknown[]> =>
new Promise(resolve => {
resolve(replaceVariablesSync(string, variables, prefix, trimWindow, ignoreCase));
});
/**
* Replaces all variable placeholders in the given string with either variable values
* found in the variables parameter OR with the given default in the variable string.
*
* @param {string} string
* @param {object} variables
* @param {string} prefix
* @param {boolean} trimWindow
* @param {boolean} ignoreCase
* @returns {unknown[]}
*/
const replaceVariablesSync = (string : string, variables: LooseObject = {}, prefix: string = "", trimWindow: boolean = false, ignoreCase: boolean = false): unknown[] => {
const regex = new RegExp(trimWindow ? windowVariableRegexPattern(prefix) : variableRegexPattern(prefix), ignoreCase ? "gmi" : "gm");
const matches = [ ...string.matchAll(regex) ];
const lowercaseVariables = toLowerKeys(variables);
let replaced = string;
const replacements : LooseObject[] = [];
for (const match of matches) {
if (trimWindow) {
const [ original, windowStart, name, , fallback, windowEnd ] = match;
// Bail if the match does not contain `^window[`
if (!windowStart) {
continue;
}
const valueStartQuote = windowStart.replace("window[", "");
const valueEndQuote = windowEnd.replace("]", "");
const withoutWindow = original.replace(windowStart, "").replace(windowEnd, "");
let value;
if (ignoreCase) {
value = Object.hasOwnProperty.call(lowercaseVariables || {}, name.toLowerCase()) ? lowercaseVariables[name.toLowerCase()] : fallback;
} else {
value = Object.hasOwnProperty.call(variables || {}, name) ? variables[name] : fallback;
}
if (value !== undefined) {
const quotedValue = `${valueStartQuote}${value}${valueEndQuote}`;
const replacement = replacements.find(r => r.from === original && r.to === quotedValue);
if (replacement) {
replacement.count = replacement.count + 1;
} else {
replacements.push({ from: original,
to: quotedValue,
count: 1 });
}
replaced = replaced.split(original).join(withoutWindow.split(withoutWindow).join(quotedValue));
}
} else {
const [ original, name, , fallback ] = match;
let value : string;
if (ignoreCase) {
value = Object.hasOwnProperty.call(lowercaseVariables || {}, name.toLowerCase()) ? lowercaseVariables[name.toLowerCase()] : fallback;
} else {
value = Object.hasOwnProperty.call(variables || {}, name) ? variables[name] : fallback;
}
if (value !== undefined) {
const replacement = replacements.find(r => r.from === original && r.to === value);
if (replacement) {
replacement.count = replacement.count + 1;
} else {
replacements.push({ from: original,
to: value,
count: 1 });
}
replaced = replaced.split(original).join(value);
}
}
}
return [ replaced, replacements ];
};
export { variableRegexPattern, replaceVariables, replaceVariablesSync };