@push.rocks/smartproxy
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A powerful proxy package with unified route-based configuration for high traffic management. Features include SSL/TLS support, flexible routing patterns, WebSocket handling, advanced security options, and automatic ACME certificate management.
104 lines • 6.85 kB
JavaScript
/**
* Utility class for resolving template variables in strings
*/
export class TemplateUtils {
/**
* Resolve template variables in a string using the route context
* Supports variables like {domain}, {path}, {clientIp}, etc.
*
* @param template The template string with {variables}
* @param context The route context with values
* @returns The resolved string
*/
static resolveTemplateVariables(template, context) {
if (!template) {
return template;
}
// Replace variables with values from context
return template.replace(/\{([a-zA-Z0-9_\.]+)\}/g, (match, varName) => {
// Handle nested properties with dot notation (e.g., {headers.host})
if (varName.includes('.')) {
const parts = varName.split('.');
let current = context;
// Traverse nested object structure
for (const part of parts) {
if (current === undefined || current === null) {
return match; // Return original if path doesn't exist
}
current = current[part];
}
// Return the resolved value if it exists
if (current !== undefined && current !== null) {
return TemplateUtils.convertToString(current);
}
return match;
}
// Direct property access
const value = context[varName];
if (value === undefined) {
return match; // Keep the original {variable} if not found
}
// Convert value to string
return TemplateUtils.convertToString(value);
});
}
/**
* Safely convert a value to a string
*
* @param value Any value to convert to string
* @returns String representation or original match for complex objects
*/
static convertToString(value) {
if (value === null || value === undefined) {
return '';
}
if (typeof value === 'string') {
return value;
}
if (typeof value === 'number' || typeof value === 'boolean') {
return value.toString();
}
if (Array.isArray(value)) {
return value.join(',');
}
if (typeof value === 'object') {
try {
return JSON.stringify(value);
}
catch (e) {
return '[Object]';
}
}
return String(value);
}
/**
* Resolve template variables in header values
*
* @param headers Header object with potential template variables
* @param context Route context for variable resolution
* @returns New header object with resolved values
*/
static resolveHeaderTemplates(headers, context) {
const result = {};
for (const [key, value] of Object.entries(headers)) {
// Skip special directive headers (starting with !)
if (value.startsWith('!')) {
result[key] = value;
continue;
}
// Resolve template variables in the header value
result[key] = TemplateUtils.resolveTemplateVariables(value, context);
}
return result;
}
/**
* Check if a string contains template variables
*
* @param str String to check for template variables
* @returns True if string contains template variables
*/
static containsTemplateVariables(str) {
return !!str && /\{([a-zA-Z0-9_\.]+)\}/g.test(str);
}
}
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