Geräte-Agent für lokale Scan-Aufträge anlegen

agents/fedeo-device-agent/src/scan/sane.ts

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+import { mkdirSync } from "node:fs"
+import path from "node:path"
+import { AgentConfig, ScanJob, ScanResult } from "../types.js"
+import { commandExists, runCommand } from "../commands.js"
+
+const mimeTypes = {
+    pdf: "application/pdf",
+    png: "image/png",
+    tiff: "image/tiff",
+}
+
+const stringSetting = (settings: Record<string, unknown> | undefined, key: string) => {
+    const value = settings?.[key]
+    return typeof value === "string" && value.trim() ? value.trim() : undefined
+}
+
+const numberSetting = (settings: Record<string, unknown> | undefined, key: string) => {
+    const value = settings?.[key]
+    if (typeof value === "number" && Number.isFinite(value)) return value
+    if (typeof value === "string" && value.trim()) {
+        const parsed = Number(value)
+        if (Number.isFinite(parsed)) return parsed
+    }
+
+    return undefined
+}
+
+export const hasSane = () => commandExists("scanimage")
+
+export const listScanners = async () => {
+    if (!await hasSane()) return []
+
+    const result = await runCommand("scanimage", ["-L"], { timeoutMs: 10_000 })
+    if (result.code !== 0) return []
+
+    return result.stdout
+        .split(/\r?\n/)
+        .map((line) => line.trim())
+        .filter((line) => line.startsWith("device `"))
+        .map((line) => line.match(/device `([^']+)'/)?.[1])
+        .filter((device): device is string => Boolean(device))
+}
+
+export const runScan = async (config: AgentConfig, job: ScanJob): Promise<ScanResult> => {
+    if (!await hasSane()) {
+        throw new Error("scanimage ist nicht installiert oder nicht im PATH")
+    }
+
+    mkdirSync(config.workDir, { recursive: true })
+
+    const settings = job.settings || {}
+    const format = stringSetting(settings, "format") as AgentConfig["scanFormat"] | undefined || config.scanFormat
+    const resolution = numberSetting(settings, "resolution") || config.scanResolution
+    const mode = stringSetting(settings, "mode") || config.scanMode
+    const source = stringSetting(settings, "source") || config.scanSource
+    const scannerName = job.scannerName || config.scannerName
+    const filename = job.requestedFilename || `${job.id}.${format}`
+    const outputPath = path.join(config.workDir, filename)
+
+    const args = [
+        "--format",
+        format,
+        "--resolution",
+        String(resolution),
+        "--mode",
+        mode,
+        "--output-file",
+        outputPath,
+    ]
+
+    if (source) args.push("--source", source)
+    if (scannerName) args.push("--device-name", scannerName)
+
+    const result = await runCommand("scanimage", args, { timeoutMs: 5 * 60 * 1000 })
+
+    if (result.code !== 0) {
+        throw new Error(result.stderr || `scanimage wurde mit Code ${result.code} beendet`)
+    }
+
+    return {
+        path: outputPath,
+        filename,
+        mimeType: mimeTypes[format] || "application/octet-stream",
+    }
+}