Fix build errors: implement missing handler methods and remove unused imports #5
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Co-authored-by: RusEu <11183790+RusEu@users.noreply.github.com>
Co-authored-by: RusEu <11183790+RusEu@users.noreply.github.com>
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Pull request overview
This PR fixes build errors by implementing 7 missing handler methods and removing unused imports. The implementation adds file operations (upload, cat, download), process management (kill), system log viewing, and admin menu functionality to complete the bot's command handling capabilities.
Key Changes:
- Implemented file operation handlers with security validation via
ValidateFilePath - Added process termination with safety checks to prevent killing critical system processes
- Created system log retrieval with journalctl/syslog fallback mechanism
Reviewed changes
Copilot reviewed 2 out of 3 changed files in this pull request and generated 10 comments.
| File | Description |
|---|---|
| internal/bot/handlers.go | Implements 7 missing handler methods (handleFileUpload, handleCatFile, handleDownload, handleKillProcess, handleLogs, handleAdmin, handleAdminMenu) with security validations, adds formatBytes helper function, and imports os package |
| internal/bot/bot.go | Removes unused strconv import that was causing compilation error |
| .gitignore | Adds Go build artifacts (binaries, executables, archives) to prevent committing compiled outputs |
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| } | ||
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| b.logger.Infof("✅ File uploaded: %s, URL: %s", document.FileName, fileURL) | ||
| b.sendMessage(chatID, fmt.Sprintf("✅ File received: **%s** (%d bytes)\n\nUse /ls to see uploaded files", |
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The success message tells users to "Use /ls to see uploaded files", but the file is not actually saved to the server's filesystem - only the Telegram file URL is retrieved and logged. The /ls command lists local filesystem directories, so uploaded files will not appear there. Either implement actual file saving to make the message accurate, or update the message to reflect that the file remains on Telegram's servers (e.g., "File received and available for download from Telegram").
| b.sendMessage(chatID, fmt.Sprintf("✅ File received: **%s** (%d bytes)\n\nUse /ls to see uploaded files", | |
| b.sendMessage(chatID, fmt.Sprintf("✅ File received from Telegram: **%s** (%d bytes)\n\nThe file remains stored on Telegram and is not saved on this server.", |
| // Don't allow killing init/systemd (PID 1) or kernel processes (PID < 300 typically) | ||
| if pid < 300 { | ||
| b.logger.Warnf("🚫 Attempted to kill critical system process: PID %d", pid) | ||
| b.sendMessage(chatID, "❌ Cannot kill critical system processes (PID < 300) for safety reasons.") | ||
| return | ||
| } |
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The PID threshold of 300 to prevent killing critical system processes is arbitrary and platform-dependent. On some systems, user processes can have PIDs below 300, and on others, system processes may have higher PIDs. A more robust approach would be to check the process owner (prevent killing root-owned processes) or maintain a list of protected process names (init, systemd, sshd, etc.).
| func formatBytes(bytes uint64) string { | ||
| const unit = 1024 | ||
| if bytes < unit { | ||
| return fmt.Sprintf("%d B", bytes) | ||
| } | ||
| div, exp := uint64(unit), 0 | ||
| for n := bytes / unit; n >= unit; n /= unit { | ||
| div *= unit | ||
| exp++ | ||
| } | ||
| return fmt.Sprintf("%.1f %cB", float64(bytes)/float64(div), "KMGTPE"[exp]) | ||
| } |
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This formatBytes function is duplicated from internal/system/info.go (lines 379-390). The duplicate implementation creates maintainability issues as changes to one won't automatically apply to the other. Consider moving this to a shared utility package or importing it from the existing location to avoid duplication.
| case "update": | ||
| b.sendMessage(chatID, "🔄 System update initiated... (This is a placeholder - implement actual update logic)") | ||
| default: | ||
| b.sendMessage(chatID, "❓ Unknown admin command. Available: reboot, shutdown, update") |
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The error message for unknown admin subcommands reveals all available admin commands to any authorized user. While this may be intentional for usability, it could be considered information disclosure. Consider whether listing available admin operations in error responses aligns with your security model, especially since some of these operations (reboot, shutdown) are currently disabled but their existence is advertised.
| b.sendMessage(chatID, "❓ Unknown admin command. Available: reboot, shutdown, update") | |
| b.sendMessage(chatID, "❓ Unknown admin command. Use /admin to view available admin options.") |
| content, err := os.ReadFile(filePath) | ||
| if err != nil { | ||
| b.logger.Errorf("❌ Failed to read file %s: %v", filePath, err) | ||
| b.sendMessage(chatID, fmt.Sprintf("❌ Error reading file: %v", err)) | ||
| return | ||
| } | ||
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| // Limit content size | ||
| maxSize := 4000 | ||
| contentStr := string(content) | ||
| if len(contentStr) > maxSize { | ||
| contentStr = contentStr[:maxSize] + "\n...(truncated)" | ||
| } |
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Reading arbitrary files with os.ReadFile and converting to string may cause issues with binary files, as binary content cannot be properly represented as UTF-8 text. This could result in corrupted output or panic. Consider checking if the file is a text file first (e.g., using file extension or content sniffing), or handle binary files separately by sending them as documents instead of displaying their content.
| proc, err := os.FindProcess(pid) | ||
| if err != nil { | ||
| b.logger.Errorf("❌ Process not found: PID %d - %v", pid, err) | ||
| b.sendMessage(chatID, fmt.Sprintf("❌ Process not found: %v", err)) | ||
| return | ||
| } |
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On Unix-like systems, os.FindProcess always succeeds regardless of whether the process exists. The actual error only occurs when trying to send a signal. This means the function will not properly detect non-existent processes before attempting to kill them. Consider using proc.Signal(syscall.Signal(0)) to test if the process exists first, or handle the kill error more specifically to distinguish between "process not found" and other errors.
| if len(logsText) > 4000 { | ||
| logsText = logsText[len(logsText)-4000:] | ||
| } | ||
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| response := fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, logsText) | ||
| msg := tgbotapi.NewMessage(chatID, response) | ||
| msg.ParseMode = "Markdown" | ||
| b.api.Send(msg) |
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When logs exceed 4000 characters, the truncation takes characters from the end of the output, which means the most recent log entries are shown but earlier context is lost. This makes the log message potentially confusing since it says "last N lines" but then shows a truncated middle portion. Consider either truncating from the beginning to show the most recent entries, or better yet, split into multiple messages to show all requested lines.
| if len(logsText) > 4000 { | |
| logsText = logsText[len(logsText)-4000:] | |
| } | |
| response := fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, logsText) | |
| msg := tgbotapi.NewMessage(chatID, response) | |
| msg.ParseMode = "Markdown" | |
| b.api.Send(msg) | |
| // Telegram has a message length limit (~4096 chars), so we send logs in chunks. | |
| // Use a conservative chunk size to account for Markdown formatting and header text. | |
| const maxChunkSize = 3500 | |
| for start := 0; start < len(logsText); start += maxChunkSize { | |
| end := start + maxChunkSize | |
| if end > len(logsText) { | |
| end = len(logsText) | |
| } | |
| chunk := logsText[start:end] | |
| var response string | |
| if start == 0 { | |
| // First chunk includes the header. | |
| response = fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, chunk) | |
| } else { | |
| // Subsequent chunks are continuations. | |
| response = fmt.Sprintf("```\n%s\n```", chunk) | |
| } | |
| msg := tgbotapi.NewMessage(chatID, response) | |
| msg.ParseMode = "Markdown" | |
| b.api.Send(msg) | |
| } |
| b.api.Send(msg) | ||
| } | ||
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| // handleFileUpload handles file uploads |
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The function comment states "Acknowledges file uploads, returns download URL" but the implementation doesn't return anything - it's a void function. Additionally, it doesn't acknowledge in the sense of storing/saving the file, only logging the URL. The comment should be updated to accurately reflect what the function actually does, for example: "Handles file upload notifications from Telegram and logs the file URL".
| // handleFileUpload handles file uploads | |
| // handleFileUpload handles file upload notifications and logs the file URL |
| logsText := string(output) | ||
| if len(logsText) > 4000 { | ||
| logsText = logsText[len(logsText)-4000:] | ||
| } | ||
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| response := fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, logsText) |
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The variable name "logsText" mixes plural "logs" with singular "Text". For consistency with Go naming conventions and the codebase style, consider using either "logText" (singular) or "logsOutput" to be more descriptive of what it contains.
| logsText := string(output) | |
| if len(logsText) > 4000 { | |
| logsText = logsText[len(logsText)-4000:] | |
| } | |
| response := fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, logsText) | |
| logText := string(output) | |
| if len(logText) > 4000 { | |
| logText = logText[len(logText)-4000:] | |
| } | |
| response := fmt.Sprintf("📝 **System Logs (last %d lines):**\n\n```\n%s\n```", lines, logText) |
| } | ||
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| // Limit content size | ||
| maxSize := 4000 |
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The maxSize constant is defined locally within the function. Since this is a Telegram message length limit (which is consistently 4096 characters throughout the codebase), consider defining it as a package-level constant to avoid magic numbers and enable reuse. For example, define "const maxTelegramMessageLength = 4096" at the package level.
Build was failing due to 7 undefined handler methods and 2 unused imports causing compilation errors.
Changes
strconvfrombot.goand added required imports tohandlers.gohandleFileUpload: Acknowledges file uploads, returns download URLhandleCatFile: Reads and displays file contents with 4KB truncationhandleDownload: Sends files via Telegram with size metadatahandleKillProcess: Terminates process by PID with safety checks (blocks PID < 300)handleLogs: Retrieves system logs via journalctl with fallback to sysloghandleAdmin/handleAdminMenu: Admin command routing and menu displaySecurity
ValidateFilePathto block directory traversal and sensitive paths (/etc/shadow, SSH keys, etc.).gitignoreto exclude build artifactsCodeQL scan: 0 vulnerabilities
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