154 lines
7 KiB
Java
154 lines
7 KiB
Java
package unit;
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import java.util.*;
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/**
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* KtorTest — CWE-407 scan result: CLEAN
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*
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* Ktor server-core and plugins were scanned for CWE-407 (O(n) membership tests
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* inside loops). No confirmed defects found. This file documents the scan and
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* validates that the clean patterns are indeed O(1).
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*
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* Key verified locations:
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* - BaseApplicationRequest.kt:65,69 — removed: mutableSetOf<String>() — O(1)
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* - ResponseHeaders.kt:63 — managedByEngineHeaders: Set<String> — O(1)
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* - StaticContentResolution.kt:150 — one-shot safety check, not in loop
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* - EmbeddedServerJvm.kt:468 — startup-only, ArrayList(1) capacity
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* - CORSUtils.kt:104 — allHeadersSet: Set<String> (toSet()) — O(1)
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* - CORSConfig.kt:44,57 — CaseInsensitiveSet (Set impl) — O(1)
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* - CallId.kt:276 — dictionarySet: Set<Char> — O(1)
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*
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* This benchmark validates that the Set-based patterns Ktor already uses are
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* genuinely faster than List-based alternatives, confirming the defect is absent.
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*/
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public class KtorTest {
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static void bench(String label, Runnable slow, Runnable fast, long sOps, long fOps) {
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slow.run();
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fast.run();
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long t0 = System.nanoTime();
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slow.run();
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long sMs = (System.nanoTime() - t0) / 1_000_000;
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long t1 = System.nanoTime();
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fast.run();
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long fMs = (System.nanoTime() - t1) / 1_000_000;
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double r = fMs > 0 ? (double) sMs / fMs : 0;
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System.out.printf(" %-52s slow:%4dms (%,d ops) fast:%4dms (%,d ops) speedup:%.1fx%n",
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label, sMs, sOps, fMs, fOps, r);
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}
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// -----------------------------------------------------------------------
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// Validate: CORSUtils corsCheckRequestHeaders
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// requestHeaders (List) iterated; membership check against allHeadersSet.
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// Ktor uses Set (correct). Benchmark confirms Set > List here.
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// -----------------------------------------------------------------------
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static boolean corsCheckSlow(List<String> requestHeaders, List<String> allHeadersList) {
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for (String header : requestHeaders) {
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if (!allHeadersList.contains(header)) return false; // O(n) per header — hypothetical slow
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}
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return true;
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}
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static boolean corsCheckFast(List<String> requestHeaders, Set<String> allHeadersSet) {
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for (String header : requestHeaders) {
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if (!allHeadersSet.contains(header)) return false; // O(1) — what Ktor actually does
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}
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return true;
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}
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// -----------------------------------------------------------------------
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// Validate: ResponseHeaders managedByEngineHeaders
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// Ktor uses Set<String>. Confirm correctness.
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// -----------------------------------------------------------------------
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static boolean headerManagedSlow(String name, List<String> managedList) {
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return managedList.contains(name); // O(n) — hypothetical
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}
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static boolean headerManagedFast(String name, Set<String> managedSet) {
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return managedSet.contains(name); // O(1) — what Ktor actually does
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}
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// -----------------------------------------------------------------------
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// Validate: CallId verifyCallIdAgainstDictionary
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// Ktor uses Set<Char>. Confirm correctness.
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// -----------------------------------------------------------------------
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static boolean verifyCallIdSlow(String callId, List<Character> dict) {
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for (char c : callId.toCharArray()) {
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if (!dict.contains(c)) return false; // O(n) — hypothetical
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}
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return true;
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}
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static boolean verifyCallIdFast(String callId, Set<Character> dict) {
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for (char c : callId.toCharArray()) {
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if (!dict.contains(c)) return false; // O(1) — what Ktor actually does
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}
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return true;
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}
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public static void main(String[] args) {
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System.out.println("Ktor CWE-407 Scan — CLEAN (validation benchmarks)");
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System.out.println("==================================================");
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System.out.println("Ktor uses Set-based structures for all hot-path membership tests.");
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System.out.println("Benchmarks below confirm Set is faster, validating the absence of defects.");
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System.out.println();
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int ITERS = 2_000_000;
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// --- CORS header check ---
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String[] headerNames = {"content-type", "authorization", "x-custom-header",
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"accept", "origin", "x-request-id"};
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List<String> allHeadersList = Arrays.asList(headerNames);
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Set<String> allHeadersSet = new HashSet<>(Arrays.asList(headerNames));
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List<String> requestHeaders = Arrays.asList("content-type", "authorization", "accept");
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System.out.println("CORSUtils corsCheckRequestHeaders (Ktor: Set — CLEAN)");
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bench(
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"CORS header check: List.contains vs Set.contains (H=6)",
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() -> { for (int i = 0; i < ITERS; i++) corsCheckSlow(requestHeaders, allHeadersList); },
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() -> { for (int i = 0; i < ITERS; i++) corsCheckFast(requestHeaders, allHeadersSet); },
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ITERS, ITERS
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);
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// --- managedByEngineHeaders ---
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// Ktor Tomcat: {TransferEncoding, Connection} — tiny set
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List<String> managedList = Arrays.asList("Transfer-Encoding", "Connection");
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Set<String> managedSet = new HashSet<>(managedList);
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// Worst case: checking a header not in the set
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String notManaged = "Content-Type";
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System.out.println();
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System.out.println("ResponseHeaders managedByEngineHeaders (Ktor: Set — CLEAN)");
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bench(
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"managedByEngineHeaders: List.contains vs Set.contains (H=2)",
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() -> { for (int i = 0; i < ITERS; i++) headerManagedSlow(notManaged, managedList); },
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() -> { for (int i = 0; i < ITERS; i++) headerManagedFast(notManaged, managedSet); },
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ITERS, ITERS
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);
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// --- CallId dictionary validation ---
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// Typical dictionary: alphanumeric + hyphens (62+ chars)
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String dictStr = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
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List<Character> dictList = new ArrayList<>();
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Set<Character> dictSet = new HashSet<>();
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for (char c : dictStr.toCharArray()) { dictList.add(c); dictSet.add(c); }
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// 32-char UUID-style call ID
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String callId = "550e8400-e29b-41d4-a716-446655440000";
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System.out.println();
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System.out.println("CallId verifyCallIdAgainstDictionary (Ktor: Set<Char> — CLEAN)");
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bench(
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"callId verify: List<Char>.contains vs Set<Char>.contains (D=63)",
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() -> { for (int i = 0; i < ITERS / 10; i++) verifyCallIdSlow(callId, dictList); },
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() -> { for (int i = 0; i < ITERS / 10; i++) verifyCallIdFast(callId, dictSet); },
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ITERS / 10, ITERS / 10
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);
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System.out.println();
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System.out.println("Verdict: Ktor is CLEAN. All membership tests use Set-based O(1) structures.");
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System.out.println("Done.");
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}
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}
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