Added first version.

.gitignore

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+.dub
+docs.json
+__dummy.html
+docs/
+/web-logbook
+web-logbook.so
+web-logbook.dylib
+web-logbook.dll
+web-logbook.a
+web-logbook.lib
+web-logbook-test-*
+*.exe
+*.pdb
+*.o
+*.obj
+*.lst
+logbook.sqlite

dub.json

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+{
+	"authors": [
+		"Andrew Lalis"
+	],
+	"copyright": "Copyright © 2023, Andrew Lalis",
+	"dependencies": {
+		"d-properties": "~>1.0.4",
+		"d2sqlite3": "~>1.0.0",
+		"handy-httpd": "~>7.6.4"
+	},
+	"subConfigurations": {
+        "d2sqlite3": "all-included"
+    },
+	"description": "A minimal D application.",
+	"license": "MIT",
+	"name": "web-logbook"
+}

dub.selections.json

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+{
+	"fileVersion": 1,
+	"versions": {
+		"d-properties": "1.0.4",
+		"d2sqlite3": "1.0.0",
+		"handy-httpd": "7.6.4",
+		"httparsed": "1.2.1",
+		"slf4d": "2.4.2",
+		"streams": "3.5.0"
+	}
+}

source/app.d

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+import handy_httpd;
+import handy_httpd.handlers.path_delegating_handler;
+import slf4d;
+import d_properties;
+import d2sqlite3;
+
+import std.file;
+import std.conv;
+import std.json;
+import std.datetime;
+
+void main() {
+	ServerConfig config = ServerConfig.defaultValues();
+	if (exists("application.properties")) {
+		Properties props = Properties("application.properties");
+		if (props.has("hostname")) {
+			config.hostname = props.get("hostname");
+		}
+		if (props.has("port")) {
+			config.port = props.get("port").to!ushort;
+		}
+	}
+	initDb();
+	HttpServer server = new HttpServer((ref HttpRequestContext ctx) {
+		ctx.response.addHeader("Access-Control-Allow-Origin", "*");
+		ctx.response.addHeader("Access-Control-Allow-Headers", "*");
+		if (ctx.request.method == Method.GET) {
+			handleLogbookRequest(ctx);
+		} else if (ctx.request.method == Method.POST) {
+			handleVisitorLog(ctx);
+		} else if (ctx.request.method == Method.OPTIONS) {
+			ctx.response.setStatus(HttpStatus.OK);
+		} else {
+			ctx.response.setStatus(HttpStatus.METHOD_NOT_ALLOWED);
+		}
+	}, config);
+	server.start();
+}
+
+void handleVisitorLog(ref HttpRequestContext ctx) {
+	infoF!"Got visitor log from %s"(ctx.request.remoteAddress);
+	JSONValue logBody = ctx.request.readBodyAsJson();
+	string name = logBody.object["name"].str;
+	string message = logBody.object["message"].str;
+	string remoteAddress = "UNKNOWN";
+	if (ctx.request.remoteAddress !is null) {
+		remoteAddress = ctx.request.remoteAddress.toString();
+	}
+	insertLogEntry(remoteAddress, name, message);
+}
+
+void handleLogbookRequest(ref HttpRequestContext ctx) {
+	LogEntry[] entries = getRecentLogEntries();
+	JSONValue entriesJson = JSONValue(JSONValue[].init);
+	foreach (LogEntry entry; entries) {
+		entriesJson.array ~= entry.toJson();
+	}
+	ctx.response.writeBodyString(entriesJson.toString(), "application/json");
+}
+
+
+
+struct LogEntry {
+	ulong id;
+	SysTime createdAt;
+	string remoteAddress;
+	string name;
+	string message;
+
+	JSONValue toJson() const {
+		JSONValue obj = JSONValue(string[string].init);
+		obj["id"] = JSONValue(id);
+		obj["createdAt"] = JSONValue(createdAt.toISOString());
+		obj["remoteAddress"] = JSONValue(remoteAddress);
+		obj["name"] = JSONValue(name);
+		obj["message"] = JSONValue(message);
+		return obj;
+	}
+}
+
+void initDb() {
+	Database db = Database("logbook.sqlite");
+	db.run(q"SQL
+CREATE TABLE IF NOT EXISTS log_entry (
+	id INTEGER PRIMARY KEY AUTOINCREMENT,
+	created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	remote_address TEXT NOT NULL,
+	name TEXT NOT NULL,
+	message TEXT NOT NULL
+);
+SQL");
+	db.close();
+	info("Initialized database.");
+}
+
+void insertLogEntry(string remoteAddress, string name, string message) {
+	Database db = Database("logbook.sqlite");
+	Statement stmt = db.prepare(q"SQL
+INSERT INTO log_entry (remote_address, name, message)
+VALUES (:addr, :name, :msg);
+SQL");
+	stmt.bind(1, remoteAddress);
+	stmt.bind(2, name);
+	stmt.bind(3, message);
+	stmt.execute();
+	stmt.finalize();
+	db.close();
+	infoF!"Added log entry for %s @ %s"(name, remoteAddress);
+}
+
+LogEntry[] getRecentLogEntries() {
+	Database db = Database("logbook.sqlite");
+	ResultRange results = db.execute("SELECT * FROM log_entry ORDER BY created_at DESC LIMIT 5");
+	LogEntry[] entries;
+	foreach (Row row; results) {
+		LogEntry entry;
+		entry.id = row.peek!ulong(0);
+		string createdAtStr = row.peek!string(1);
+		string isoCreatedAt = createdAtStr[0 .. 4] ~ createdAtStr[5 .. 7] ~ createdAtStr[8 .. 10] ~ 'T' ~
+			createdAtStr[11 .. 13] ~ createdAtStr[14 .. 16] ~ createdAtStr[17 .. $];
+		entry.createdAt = SysTime.fromISOString(isoCreatedAt);
+		entry.remoteAddress = row.peek!string(2);
+		entry.name = row.peek!string(3);
+		entry.message = row.peek!string(4);
+		entries ~= entry;
+	}
+	return entries;
+}