2 files changed, 92 insertions, 0 deletions

diff --git a/server/controllers/api/server/index.ts b/server/controllers/api/server/index.ts
index 814248e5f..de09588df 100644
--- a/server/controllers/api/server/index.ts
+++ b/server/controllers/api/server/index.ts
@@ -4,6 +4,7 @@ import { statsRouter } from './stats'
 import { serverRedundancyRouter } from './redundancy'
 import { serverBlocklistRouter } from './server-blocklist'
 import { contactRouter } from './contact'
+import { logsRouter } from './logs'
 
 const serverRouter = express.Router()
 
@@ -12,6 +13,7 @@ serverRouter.use('/', serverRedundancyRouter)
 serverRouter.use('/', statsRouter)
 serverRouter.use('/', serverBlocklistRouter)
 serverRouter.use('/', contactRouter)
+serverRouter.use('/', logsRouter)
 
 // ---------------------------------------------------------------------------
 
diff --git a/server/controllers/api/server/logs.ts b/server/controllers/api/server/logs.ts
new file mode 100644
index 000000000..c551c67e3
--- /dev/null
+++ b/server/controllers/api/server/logs.ts
@@ -0,0 +1,90 @@
+import * as express from 'express'
+import { UserRight } from '../../../../shared/models/users'
+import { asyncMiddleware, authenticate, ensureUserHasRight } from '../../../middlewares'
+import { mtimeSortFilesDesc } from '../../../../shared/utils/logs/logs'
+import { readdir } from 'fs-extra'
+import { CONFIG, MAX_LOGS_OUTPUT_CHARACTERS } from '../../../initializers'
+import { createInterface } from 'readline'
+import { createReadStream } from 'fs'
+import { join } from 'path'
+import { getLogsValidator } from '../../../middlewares/validators/logs'
+import { LogLevel } from '../../../../shared/models/server/log-level.type'
+
+const logsRouter = express.Router()
+
+logsRouter.get('/logs',
+  authenticate,
+  ensureUserHasRight(UserRight.MANAGE_LOGS),
+  getLogsValidator,
+  asyncMiddleware(getLogs)
+)
+
+// ---------------------------------------------------------------------------
+
+export {
+  logsRouter
+}
+
+// ---------------------------------------------------------------------------
+
+async function getLogs (req: express.Request, res: express.Response) {
+  const logFiles = await readdir(CONFIG.STORAGE.LOG_DIR)
+  const sortedLogFiles = await mtimeSortFilesDesc(logFiles, CONFIG.STORAGE.LOG_DIR)
+  let currentSize = 0
+
+  const startDate = new Date(req.query.startDate)
+  const endDate = req.query.endDate ? new Date(req.query.endDate) : new Date()
+  const level: LogLevel = req.query.level || 'info'
+
+  let output = ''
+
+  for (const meta of sortedLogFiles) {
+    const path = join(CONFIG.STORAGE.LOG_DIR, meta.file)
+
+    const result = await getOutputFromFile(path, startDate, endDate, level, currentSize)
+    if (!result.output) break
+
+    output = output + result.output
+    currentSize = result.currentSize
+
+    if (currentSize > MAX_LOGS_OUTPUT_CHARACTERS) break
+  }
+
+  return res.json(output).end()
+}
+
+function getOutputFromFile (path: string, startDate: Date, endDate: Date, level: LogLevel, currentSize: number) {
+  const startTime = startDate.getTime()
+  const endTime = endDate.getTime()
+
+  const logsLevel: { [ id in LogLevel ]: number } = {
+    debug: 0,
+    info: 1,
+    warn: 2,
+    error: 3
+  }
+
+  return new Promise<{ output: string, currentSize: number }>(res => {
+    const stream = createReadStream(path)
+    let output = ''
+
+    stream.once('close', () => res({ output, currentSize }))
+
+    const rl = createInterface({
+      input: stream
+    })
+
+    rl.on('line', line => {
+      const log = JSON.parse(line)
+
+      const logTime = new Date(log.timestamp).getTime()
+      if (logTime >= startTime && logTime <= endTime && logsLevel[log.level] >= logsLevel[level]) {
+        output += line
+
+        currentSize += line.length
+
+        if (currentSize > MAX_LOGS_OUTPUT_CHARACTERS) stream.close()
+      }
+    })
+  })
+}