// Infomaniak-specific MIME decoder functions export function decodeQuotedPrintable(text: string, charset: string): string { if (!text) return ''; // Replace soft line breaks (=\r\n or =\n or =\r) let decoded = text.replace(/=(?:\r\n|\n|\r)/g, ''); // Replace quoted-printable encoded characters decoded = decoded // Handle common encoded characters .replace(/=3D/g, '=') .replace(/=20/g, ' ') .replace(/=09/g, '\t') .replace(/=0A/g, '\n') .replace(/=0D/g, '\r') // Handle other quoted-printable encoded characters .replace(/=([0-9A-F]{2})/gi, (match, p1) => { return String.fromCharCode(parseInt(p1, 16)); }); // Handle character encoding try { if (typeof TextDecoder !== 'undefined') { const bytes = new Uint8Array(Array.from(decoded).map(c => c.charCodeAt(0))); return new TextDecoder(charset).decode(bytes); } return decoded; } catch (e) { console.warn('Charset conversion error:', e); return decoded; } } export function decodeBase64(text: string, charset: string): string { if (!text) return ''; try { // Remove any whitespace and line breaks const cleanText = text.replace(/\s+/g, ''); // Decode base64 const binary = atob(cleanText); // Convert to bytes const bytes = new Uint8Array(binary.length); for (let i = 0; i < binary.length; i++) { bytes[i] = binary.charCodeAt(i); } // Decode using specified charset if (typeof TextDecoder !== 'undefined') { return new TextDecoder(charset).decode(bytes); } // Fallback return binary; } catch (e) { console.warn('Base64 decoding error:', e); return text; } } export function convertCharset(text: string, charset: string): string { if (!text) return ''; try { if (typeof TextDecoder !== 'undefined') { // Handle common charset aliases const normalizedCharset = charset.toLowerCase() .replace(/^iso-8859-1$/, 'windows-1252') .replace(/^iso-8859-15$/, 'windows-1252') .replace(/^utf-8$/, 'utf-8') .replace(/^us-ascii$/, 'utf-8'); const bytes = new Uint8Array(Array.from(text).map(c => c.charCodeAt(0))); return new TextDecoder(normalizedCharset).decode(bytes); } return text; } catch (e) { console.warn('Charset conversion error:', e); return text; } } export function cleanHtml(html: string): string { if (!html) return ''; // Detect text direction from the content const hasRtlChars = /[\u0591-\u07FF\u200F\u202B\u202E\uFB1D-\uFDFD\uFE70-\uFEFC]/.test(html); const defaultDir = hasRtlChars ? 'rtl' : 'ltr'; // Remove or fix malformed URLs html = html.replace(/=3D"(http[^"]+)"/g, (match, url) => { try { return `"${decodeURIComponent(url)}"`; } catch { return ''; } }); // Remove any remaining quoted-printable artifacts html = html.replace(/=([0-9A-F]{2})/gi, (match, p1) => { return String.fromCharCode(parseInt(p1, 16)); }); // Clean up any remaining HTML issues while preserving direction html = html // Remove style and script tags .replace(/]*>[\s\S]*?<\/style>/gi, '') .replace(/]*>[\s\S]*?<\/script>/gi, '') .replace(/]*>/gi, '') .replace(/]*>/gi, '') .replace(/]*>/gi, '') .replace(/]*>[\s\S]*?<\/title>/gi, '') .replace(/]*>[\s\S]*?<\/head>/gi, '') // Preserve body attributes .replace(/]*>/gi, (match) => { const dir = match.match(/dir=["'](rtl|ltr)["']/i)?.[1] || defaultDir; return ``; }) .replace(/<\/body>/gi, '') .replace(/]*>/gi, '') .replace(/<\/html>/gi, '') // Handle tables .replace(/]*>/gi, '\n') .replace(/<\/table>/gi, '\n') .replace(/]*>/gi, '\n') .replace(/<\/tr>/gi, '\n') .replace(/]*>/gi, ' ') .replace(/<\/td>/gi, ' ') .replace(/]*>/gi, ' ') .replace(/<\/th>/gi, ' ') // Handle lists .replace(/]*>/gi, '\n') .replace(/<\/ul>/gi, '\n') .replace(/]*>/gi, '\n') .replace(/<\/ol>/gi, '\n') .replace(/]*>/gi, '• ') .replace(/<\/li>/gi, '\n') // Handle other block elements .replace(/]*>/gi, '\n') .replace(/<\/div>/gi, '\n') .replace(/]*>/gi, '\n') .replace(/<\/p>/gi, '\n') .replace(/]*>/gi, '\n') .replace(/]*>/gi, '\n') // Handle inline elements .replace(/]*>/gi, '') .replace(/<\/span>/gi, '') .replace(/]*>/gi, '') .replace(/<\/a>/gi, '') .replace(/]*>/gi, '**') .replace(/<\/strong>/gi, '**') .replace(/]*>/gi, '**') .replace(/<\/b>/gi, '**') .replace(/]*>/gi, '*') .replace(/<\/em>/gi, '*') .replace(/]*>/gi, '*') .replace(/<\/i>/gi, '*') // Handle special characters .replace(/ /g, ' ') .replace(/&/g, '&') .replace(/</g, '<') .replace(/>/g, '>') .replace(/"/g, '"') .replace(/'/g, "'") // Clean up whitespace .replace(/\s+/g, ' ') .trim(); // Wrap in a div with the detected direction return `

${html}

`; } export function parseEmailHeaders(headers: string): { contentType: string; encoding: string; charset: string } { const result = { contentType: 'text/plain', encoding: '7bit', charset: 'utf-8' }; // Extract content type and charset const contentTypeMatch = headers.match(/Content-Type:\s*([^;]+)(?:;\s*charset=([^;"\r\n]+)|(?:;\s*charset="([^"]+)"))?/i); if (contentTypeMatch) { result.contentType = contentTypeMatch[1].trim().toLowerCase(); if (contentTypeMatch[2]) { result.charset = contentTypeMatch[2].trim().toLowerCase(); } else if (contentTypeMatch[3]) { result.charset = contentTypeMatch[3].trim().toLowerCase(); } } // Extract content transfer encoding const encodingMatch = headers.match(/Content-Transfer-Encoding:\s*([^\s;\r\n]+)/i); if (encodingMatch) { result.encoding = encodingMatch[1].trim().toLowerCase(); } return result; } export function extractBoundary(headers: string): string | null { const boundaryMatch = headers.match(/boundary="?([^"\r\n;]+)"?/i) || headers.match(/boundary=([^\r\n;]+)/i); return boundaryMatch ? boundaryMatch[1].trim() : null; } export function extractFilename(headers: string): string { const filenameMatch = headers.match(/filename="?([^"\r\n;]+)"?/i) || headers.match(/name="?([^"\r\n;]+)"?/i); return filenameMatch ? filenameMatch[1] : 'attachment'; } export function extractHeader(headers: string, headerName: string): string { const regex = new RegExp(`^${headerName}:\\s*(.*)$`, 'im'); const match = headers.match(regex); return match ? match[1].trim() : ''; }