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New Bank Auto Complete

backend/scripts/generate-de-bank-codes.ts

@@ -0,0 +1,95 @@
+import fs from "node:fs/promises"
+import path from "node:path"
+import https from "node:https"
+
+const DEFAULT_SOURCE_URL =
+    "https://www.bundesbank.de/resource/blob/602632/bec25ca5df1eb62fefadd8325dafe67c/472B63F073F071307366337C94F8C870/blz-aktuell-txt-data.txt"
+
+const OUTPUT_NAME_FILE = path.resolve("src/utils/deBankCodes.ts")
+const OUTPUT_BIC_FILE = path.resolve("src/utils/deBankBics.ts")
+
+function fetchBuffer(url: string): Promise<Buffer> {
+    return new Promise((resolve, reject) => {
+        https
+            .get(url, (res) => {
+                if (res.statusCode && res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
+                    return resolve(fetchBuffer(res.headers.location))
+                }
+
+                if (res.statusCode !== 200) {
+                    return reject(new Error(`Download failed with status ${res.statusCode}`))
+                }
+
+                const chunks: Buffer[] = []
+                res.on("data", (chunk) => chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk)))
+                res.on("end", () => resolve(Buffer.concat(chunks)))
+                res.on("error", reject)
+            })
+            .on("error", reject)
+    })
+}
+
+function escapeTsString(value: string) {
+    return value.replace(/\\/g, "\\\\").replace(/"/g, '\\"')
+}
+
+async function main() {
+    const source = process.env.BLZ_SOURCE_URL || DEFAULT_SOURCE_URL
+    const sourceFile = process.env.BLZ_SOURCE_FILE
+    let raw: Buffer
+
+    if (sourceFile) {
+        console.log(`Reading BLZ source file: ${sourceFile}`)
+        raw = await fs.readFile(sourceFile)
+    } else {
+        console.log(`Downloading BLZ source: ${source}`)
+        raw = await fetchBuffer(source)
+    }
+    const content = raw.toString("latin1")
+
+    const lines = content.split(/\r?\n/)
+    const nameMap = new Map<string, string>()
+    const bicMap = new Map<string, string>()
+
+    for (const line of lines) {
+        if (!line || line.length < 150) continue
+        const blz = line.slice(0, 8).trim()
+        const name = line.slice(9, 67).trim()
+        const bic = line.slice(139, 150).trim()
+
+        if (!/^\d{8}$/.test(blz) || !name) continue
+        if (!nameMap.has(blz)) nameMap.set(blz, name)
+        if (bic && !bicMap.has(blz)) bicMap.set(blz, bic)
+    }
+
+    const sortedNames = [...nameMap.entries()].sort(([a], [b]) => a.localeCompare(b))
+    const sortedBics = [...bicMap.entries()].sort(([a], [b]) => a.localeCompare(b))
+
+    const nameOutputLines = [
+        "// Lokale Bankleitzahl-zu-Institut Zuordnung (DE).",
+        "// Quelle: Deutsche Bundesbank, BLZ-Datei (vollstaendig).",
+        "export const DE_BANK_CODE_TO_NAME: Record<string, string> = {",
+        ...sortedNames.map(([blz, name]) => `    "${blz}": "${escapeTsString(name)}",`),
+        "}",
+        "",
+    ]
+
+    const bicOutputLines = [
+        "// Lokale Bankleitzahl-zu-BIC Zuordnung (DE).",
+        "// Quelle: Deutsche Bundesbank, BLZ-Datei (vollstaendig).",
+        "export const DE_BANK_CODE_TO_BIC: Record<string, string> = {",
+        ...sortedBics.map(([blz, bic]) => `    "${blz}": "${escapeTsString(bic)}",`),
+        "}",
+        "",
+    ]
+
+    await fs.writeFile(OUTPUT_NAME_FILE, nameOutputLines.join("\n"), "utf8")
+    await fs.writeFile(OUTPUT_BIC_FILE, bicOutputLines.join("\n"), "utf8")
+    console.log(`Wrote ${sortedNames.length} bank names to ${OUTPUT_NAME_FILE}`)
+    console.log(`Wrote ${sortedBics.length} bank BICs to ${OUTPUT_BIC_FILE}`)
+}
+
+main().catch((err) => {
+    console.error(err)
+    process.exit(1)
+})