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fix(logs): escape HTML entities in log output

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Log content may contain <, >, & characters (like "<computed>") which
Telegram interprets as HTML tags when using parse_mode=HTML.

Added escapeHtml() function to convert:
- & → &amp;
- < → &lt;
- > → &gt;

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Lucas Berger
2026-02-02 21:31:22 -05:00
parent 74dd8f1a94
commit 287c7220cb
1 changed files with 1 additions and 1 deletions
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n8n-workflow.json
+1 -1
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@@ -2106,7 +2106,7 @@
}, },
{ {
"parameters": { "parameters": {
"jsCode": "// Format Docker logs for Telegram\nconst rawOutput = $input.item.json.stdout || '';\nconst containerName = $('Build Logs Command').item.json.containerName;\nconst requestedLines = $('Build Logs Command').item.json.lines;\nconst chatId = $('Build Logs Command').item.json.chatId;\n\n// Handle empty logs\nif (!rawOutput || rawOutput.trim() === '') {\n return {\n json: {\n chatId: chatId,\n text: `No logs available for <b>${containerName}</b>`\n }\n };\n}\n\n// Docker API with timestamps returns text lines when using tail parameter\n// But may have 8-byte binary headers we need to strip\nconst lines = rawOutput.split('\\n')\n .filter(line => line.length > 0)\n .map(line => {\n // Check if line starts with binary header (non-printable chars in first 8 bytes)\n if (line.length > 8 && line.charCodeAt(0) <= 2) {\n return line.substring(8);\n }\n return line;\n })\n .join('\\n');\n\n// Truncate for Telegram (4096 char limit, leave room for header)\nconst maxLen = 3800;\nconst truncated = lines.length > maxLen\n ? lines.substring(0, maxLen) + '\\n... (truncated)'\n : lines;\n\nconst lineCount = lines.split('\\n').length;\nconst header = `Logs for <b>${containerName}</b> (last ${lineCount} lines):\\n\\n`;\n\nreturn {\n json: {\n chatId: chatId,\n text: header + '<pre>' + truncated + '</pre>'\n }\n};" "jsCode": "// Format Docker logs for Telegram\nconst rawOutput = $input.item.json.stdout || '';\nconst containerName = $('Build Logs Command').item.json.containerName;\nconst requestedLines = $('Build Logs Command').item.json.lines;\nconst chatId = $('Build Logs Command').item.json.chatId;\n\n// HTML escape function for log content\nfunction escapeHtml(text) {\n return text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');\n}\n\n// Handle empty logs\nif (!rawOutput || rawOutput.trim() === '') {\n return {\n json: {\n chatId: chatId,\n text: `No logs available for <b>${containerName}</b>`\n }\n };\n}\n\n// Docker API with timestamps returns text lines when using tail parameter\n// But may have 8-byte binary headers we need to strip\nconst lines = rawOutput.split('\\n')\n .filter(line => line.length > 0)\n .map(line => {\n // Check if line starts with binary header (non-printable chars in first 8 bytes)\n if (line.length > 8 && line.charCodeAt(0) <= 2) {\n return line.substring(8);\n }\n return line;\n })\n .join('\\n');\n\n// Truncate for Telegram (4096 char limit, leave room for header)\nconst maxLen = 3800;\nconst truncated = lines.length > maxLen\n ? lines.substring(0, maxLen) + '\\n... (truncated)'\n : lines;\n\n// Escape HTML entities in log content to prevent parse errors\nconst escaped = escapeHtml(truncated);\n\nconst lineCount = lines.split('\\n').length;\nconst header = `Logs for <b>${containerName}</b> (last ${lineCount} lines):\\n\\n`;\n\nreturn {\n json: {\n chatId: chatId,\n text: header + '<pre>' + escaped + '</pre>'\n }\n};"
}, },
"id": "code-format-logs", "id": "code-format-logs",
"name": "Format Logs", "name": "Format Logs",