claude-code-history-mcp
Version:
MCP server for Claude Code conversation history tracking and analysis
398 lines • 19.1 kB
JavaScript
import * as fs from 'fs/promises';
import * as path from 'path';
import * as os from 'os';
import { createReadStream } from 'fs';
import { createInterface } from 'readline';
export class ClaudeCodeHistoryService {
claudeDir;
constructor() {
this.claudeDir = path.join(os.homedir(), '.claude');
}
/**
* Normalize date string to ISO format for proper comparison with timezone support
*/
normalizeDate(dateString, isEndDate = false, timezone) {
if (dateString.includes('T')) {
return dateString;
}
const tz = timezone || Intl.DateTimeFormat().resolvedOptions().timeZone;
try {
if (tz === 'UTC') {
const timeStr = isEndDate ? '23:59:59.999' : '00:00:00.000';
return `${dateString}T${timeStr}Z`;
}
// Correct approach: Create date in target timezone and convert to UTC
const [year, month, day] = dateString.split('-').map(Number);
const hour = isEndDate ? 23 : 0;
const minute = isEndDate ? 59 : 0;
const second = isEndDate ? 59 : 0;
const millisecond = isEndDate ? 999 : 0;
// Create a reference date to calculate offset
const referenceDate = new Date(year, month - 1, day, 12, 0, 0); // Use noon for stable offset
// Calculate timezone offset for this specific date (handles DST)
const offsetMs = referenceDate.getTimezoneOffset() * 60000;
// Create the target time in the specified timezone
const localTime = new Date(year, month - 1, day, hour, minute, second, millisecond);
// Get what this local time would be in the target timezone
const targetTzTime = new Date(localTime.toLocaleString('en-CA', { timeZone: tz }));
const utcTime = new Date(localTime.toLocaleString('en-CA', { timeZone: 'UTC' }));
// Calculate the difference between target timezone and UTC
const tzOffsetMs = targetTzTime.getTime() - utcTime.getTime();
// Adjust local time to get UTC equivalent
const utcResult = new Date(localTime.getTime() + offsetMs - tzOffsetMs);
const result = utcResult.toISOString();
console.log(`normalizeDate: ${dateString} (${isEndDate ? 'end' : 'start'}) in ${tz} -> ${result}`);
return result;
}
catch (error) {
console.warn(`Failed to process timezone ${tz}, falling back to simple conversion:`, error);
const fallback = `${dateString}T${isEndDate ? '23:59:59.999' : '00:00:00.000'}Z`;
console.log(`normalizeDate fallback: ${dateString} -> ${fallback}`);
return fallback;
}
}
async getConversationHistory(options = {}) {
const { sessionId, startDate, endDate, limit = 20, offset = 0, timezone, messageTypes } = options;
// Normalize date strings for proper comparison
const normalizedStartDate = startDate ? this.normalizeDate(startDate, false, timezone) : undefined;
const normalizedEndDate = endDate ? this.normalizeDate(endDate, true, timezone) : undefined;
// Determine which message types to include (default to user only to reduce data volume)
const allowedTypes = messageTypes && messageTypes.length > 0 ? messageTypes : ['user'];
// Load history from Claude Code's .jsonl files with pre-filtering
let allEntries = await this.loadClaudeHistoryEntries({
startDate: normalizedStartDate,
endDate: normalizedEndDate
});
// Filter by session ID if specified
if (sessionId) {
allEntries = allEntries.filter(entry => entry.sessionId === sessionId);
}
// Filter by message types (defaults to user only)
allEntries = allEntries.filter(entry => allowedTypes.includes(entry.type));
// Filter by date range if specified (additional in-memory filtering for precision)
if (normalizedStartDate) {
allEntries = allEntries.filter(entry => entry.timestamp >= normalizedStartDate);
}
if (normalizedEndDate) {
allEntries = allEntries.filter(entry => entry.timestamp <= normalizedEndDate);
}
// Sort by timestamp (newest first)
allEntries.sort((a, b) => new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime());
// Calculate pagination
const totalCount = allEntries.length;
const paginatedEntries = allEntries.slice(offset, offset + limit);
const hasMore = offset + limit < totalCount;
return {
entries: paginatedEntries,
pagination: {
total_count: totalCount,
limit,
offset,
has_more: hasMore
}
};
}
async searchConversations(searchQuery, options = {}) {
const { limit = 30, projectPath, startDate, endDate, timezone } = options;
// Normalize date strings for proper comparison
const normalizedStartDate = startDate ? this.normalizeDate(startDate, false, timezone) : undefined;
const normalizedEndDate = endDate ? this.normalizeDate(endDate, true, timezone) : undefined;
const allEntries = await this.loadClaudeHistoryEntries({
startDate: normalizedStartDate,
endDate: normalizedEndDate
});
const queryLower = searchQuery.toLowerCase();
let matchedEntries = allEntries.filter(entry => entry.content.toLowerCase().includes(queryLower));
// Filter by project path if specified
if (projectPath) {
matchedEntries = matchedEntries.filter(entry => entry.projectPath === projectPath);
}
// Filter by date range if specified (additional in-memory filtering for precision)
if (normalizedStartDate) {
matchedEntries = matchedEntries.filter(entry => entry.timestamp >= normalizedStartDate);
}
if (normalizedEndDate) {
matchedEntries = matchedEntries.filter(entry => entry.timestamp <= normalizedEndDate);
}
matchedEntries.sort((a, b) => new Date(b.timestamp).getTime() - new Date(a.timestamp).getTime());
return matchedEntries.slice(0, limit);
}
async listProjects() {
const projects = new Map();
try {
const projectsDir = path.join(this.claudeDir, 'projects');
const projectDirs = await fs.readdir(projectsDir);
for (const projectDir of projectDirs) {
const projectPath = path.join(projectsDir, projectDir);
const stats = await fs.stat(projectPath);
if (stats.isDirectory()) {
const files = await fs.readdir(projectPath);
const decodedPath = this.decodeProjectPath(projectDir);
if (!projects.has(decodedPath)) {
projects.set(decodedPath, {
sessionIds: new Set(),
messageCount: 0,
lastActivityTime: '1970-01-01T00:00:00.000Z'
});
}
const projectInfo = projects.get(decodedPath);
if (!projectInfo)
continue;
for (const file of files) {
if (file.endsWith('.jsonl')) {
const sessionId = file.replace('.jsonl', '');
projectInfo.sessionIds.add(sessionId);
const filePath = path.join(projectPath, file);
const fileStats = await fs.stat(filePath);
if (fileStats.mtime.toISOString() > projectInfo.lastActivityTime) {
projectInfo.lastActivityTime = fileStats.mtime.toISOString();
}
// Count messages in this session
const entries = await this.parseJsonlFile(filePath, projectDir);
projectInfo.messageCount += entries.length;
}
}
}
}
}
catch (error) {
console.error('Error listing projects:', error);
}
return Array.from(projects.entries()).map(([projectPath, info]) => ({
projectPath,
sessionCount: info.sessionIds.size,
messageCount: info.messageCount,
lastActivityTime: info.lastActivityTime
}));
}
async listSessions(options = {}) {
const { projectPath, startDate, endDate, timezone } = options;
// Normalize date strings for proper comparison
const normalizedStartDate = startDate ? this.normalizeDate(startDate, false, timezone) : undefined;
const normalizedEndDate = endDate ? this.normalizeDate(endDate, true, timezone) : undefined;
const sessions = [];
try {
const projectsDir = path.join(this.claudeDir, 'projects');
const projectDirs = await fs.readdir(projectsDir);
for (const projectDir of projectDirs) {
const decodedPath = this.decodeProjectPath(projectDir);
// Filter by project path if specified
if (projectPath && decodedPath !== projectPath) {
continue;
}
const projectDirPath = path.join(projectsDir, projectDir);
const stats = await fs.stat(projectDirPath);
if (stats.isDirectory()) {
const files = await fs.readdir(projectDirPath);
for (const file of files) {
if (file.endsWith('.jsonl')) {
const sessionId = file.replace('.jsonl', '');
const filePath = path.join(projectDirPath, file);
const entries = await this.parseJsonlFile(filePath, projectDir);
if (entries.length === 0)
continue;
const sessionStart = entries[entries.length - 1].timestamp;
const sessionEnd = entries[0].timestamp;
// Filter by date range if specified
if (normalizedStartDate && sessionEnd < normalizedStartDate)
continue;
if (normalizedEndDate && sessionStart > normalizedEndDate)
continue;
const userMessageCount = entries.filter(e => e.type === 'user').length;
const assistantMessageCount = entries.filter(e => e.type === 'assistant').length;
sessions.push({
sessionId,
projectPath: decodedPath,
startTime: sessionStart,
endTime: sessionEnd,
messageCount: entries.length,
userMessageCount,
assistantMessageCount
});
}
}
}
}
}
catch (error) {
console.error('Error listing sessions:', error);
}
// Sort by start time (newest first)
sessions.sort((a, b) => new Date(b.startTime).getTime() - new Date(a.startTime).getTime());
return sessions;
}
async loadClaudeHistoryEntries(options = {}) {
const entries = [];
const { startDate, endDate } = options;
try {
const projectsDir = path.join(this.claudeDir, 'projects');
const projectDirs = await fs.readdir(projectsDir);
for (const projectDir of projectDirs) {
const projectPath = path.join(projectsDir, projectDir);
const stats = await fs.stat(projectPath);
if (stats.isDirectory()) {
const files = await fs.readdir(projectPath);
for (const file of files) {
if (file.endsWith('.jsonl')) {
const filePath = path.join(projectPath, file);
// Pre-filter files based on modification time
if (await this.shouldSkipFile(filePath, startDate, endDate)) {
continue;
}
const sessionEntries = await this.parseJsonlFile(filePath, projectDir, startDate, endDate);
entries.push(...sessionEntries);
}
}
}
}
}
catch (error) {
console.error('Error loading Claude history:', error);
}
return entries;
}
async parseJsonlFile(filePath, projectDir, startDate, endDate) {
const entries = [];
try {
const fileStream = createReadStream(filePath);
const rl = createInterface({
input: fileStream,
crlfDelay: Infinity
});
for await (const line of rl) {
if (line.trim()) {
try {
const claudeMessage = JSON.parse(line);
// Apply date filtering at message level for efficiency
if (startDate && claudeMessage.timestamp < startDate) {
continue;
}
if (endDate && claudeMessage.timestamp > endDate) {
continue;
}
const entry = this.convertClaudeMessageToEntry(claudeMessage, projectDir);
if (entry) {
entries.push(entry);
}
}
catch (parseError) {
console.error('Error parsing line:', parseError);
}
}
}
}
catch (error) {
console.error('Error reading file:', filePath, error);
}
return entries;
}
convertClaudeMessageToEntry(claudeMessage, projectDir) {
try {
let content = '';
if (claudeMessage.message?.content) {
if (typeof claudeMessage.message.content === 'string') {
content = claudeMessage.message.content;
}
else if (Array.isArray(claudeMessage.message.content)) {
// Handle array content (e.g., from assistant messages)
content = claudeMessage.message.content
.map(item => {
if (typeof item === 'string')
return item;
if (item?.type === 'text' && item?.text)
return item.text;
return JSON.stringify(item);
})
.join(' ');
}
}
// Decode project path from directory name
const projectPath = this.decodeProjectPath(projectDir);
// Add enhanced time information
const timestamp = claudeMessage.timestamp;
const messageDate = new Date(timestamp);
return {
sessionId: claudeMessage.sessionId,
timestamp,
type: claudeMessage.type,
content,
projectPath,
uuid: claudeMessage.uuid,
formattedTime: messageDate.toLocaleString('en-US', {
timeZone: 'Asia/Tokyo',
year: 'numeric',
month: '2-digit',
day: '2-digit',
hour: '2-digit',
minute: '2-digit',
second: '2-digit',
hour12: false
}),
timeAgo: this.getTimeAgo(messageDate),
localDate: messageDate.toLocaleDateString('sv-SE', { timeZone: 'Asia/Tokyo' }),
metadata: {
usage: claudeMessage.message?.usage,
model: claudeMessage.message?.model,
requestId: claudeMessage.requestId
}
};
}
catch (error) {
console.error('Error converting Claude message:', error);
return null;
}
}
getTimeAgo(date) {
const now = new Date();
const diffMs = now.getTime() - date.getTime();
const diffMins = Math.floor(diffMs / (1000 * 60));
const diffHours = Math.floor(diffMs / (1000 * 60 * 60));
const diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));
if (diffMins < 1)
return 'just now';
if (diffMins < 60)
return `${diffMins}m ago`;
if (diffHours < 24)
return `${diffHours}h ago`;
if (diffDays < 7)
return `${diffDays}d ago`;
if (diffDays < 30)
return `${Math.floor(diffDays / 7)}w ago`;
if (diffDays < 365)
return `${Math.floor(diffDays / 30)}mo ago`;
return `${Math.floor(diffDays / 365)}y ago`;
}
decodeProjectPath(projectDir) {
return projectDir.replace(/-/g, '/').replace(/^\//, '');
}
/**
* Determines whether to skip reading a file based on its modification time
*/
async shouldSkipFile(filePath, startDate, endDate) {
if (!startDate && !endDate) {
return false; // Don't skip if no date filters are specified
}
try {
const fileStats = await fs.stat(filePath);
const fileModTime = fileStats.mtime.toISOString();
const fileCreateTime = fileStats.birthtime.toISOString();
// Get the earliest and latest possible times for file content
const oldestPossibleTime = fileCreateTime < fileModTime ? fileCreateTime : fileModTime;
const newestPossibleTime = fileModTime;
// If endDate is specified: skip if file's oldest time is after endDate
if (endDate && oldestPossibleTime > endDate) {
return true; // Skip
}
// If startDate is specified: skip if file's newest time is before startDate
if (startDate && newestPossibleTime < startDate) {
return true; // Skip
}
return false; // File might contain data in range, so read it
}
catch (error) {
console.warn(`Failed to get file stats for ${filePath}:`, error);
return false; // Safe fallback: read the file if stat fails
}
}
}
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