Transform SHA512s to lowercase for azurl. (#1574)

Same as #1564 but for azurl as well.

azure-pipelines/end-to-end-tests-dir/asset-caching.ps1

@@ -137,14 +137,14 @@ $expected = @(
 "$"
 ) -join "`n"
 
-$actual = Run-VcpkgAndCaptureOutput -TestArgs ($commonArgs + @("x-download", "$downloadsRoot/example3.html", "--sha512", "d06b93c883f8126a04589937a884032df031b05518eed9d433efb6447834df2596aebd500d69b8283e5702d988ed49655ae654c1683c7a4ae58bfa6b92f2b73a", "--url", "https://localhost:1234/foobar.html", "--url", "https://localhost:1235/baz.html"))
+$actual = Run-VcpkgAndCaptureOutput -TestArgs ($commonArgs + @("x-download", "$downloadsRoot/example3.html", "--sha512", "D06B93C883F8126A04589937A884032DF031B05518EED9D433EFB6447834DF2596AEBD500D69B8283E5702D988ED49655AE654C1683C7A4AE58BFA6B92F2B73A", "--url", "https://localhost:1234/foobar.html", "--url", "https://localhost:1235/baz.html"))
 Throw-IfNotFailed
 if (-not ($actual -match $expected)) {
     throw "Failure: azurl (no), x-block-origin (no), asset-cache (n/a), download (fail)"
 }
 
 #azurl (no), x-block-origin (no), asset-cache (n/a), download (sha-mismatch)
-#Expected: Hash check failed message expected/actual sha
+#Expected: Hash check failed message expected/actual sha. Note that the expected sha is changed to lowercase.
 Refresh-TestRoot
 $expected = @(
 "^Downloading https://example\.com -> example3\.html",
@@ -230,7 +230,7 @@ Throw-IfNotFailed
 
 
 # azurl (yes), x-block-origin (no), asset-cache (miss), download (fail)
-# Expected: Download failure message, asset cache named, nothing about x-block-origin
+# Expected: Download failure message, asset cache named, nothing about x-block-origin. Note that the expected SHA is changed to lowercase.
 Refresh-TestRoot
 $expected = @(
 "^Trying to download example3\.html using asset cache file://$assetCacheRegex/[0-9a-z]+",
@@ -250,7 +250,7 @@ $expected = @(
 "$"
 ) -join "`n"
 
-$actual = Run-VcpkgAndCaptureOutput -TestArgs ($commonArgs + @("x-download", "$downloadsRoot/example3.html", "--sha512", "d06b93c883f8126a04589937a884032df031b05518eed9d433efb6447834df2596aebd500d69b8283e5702d988ed49655ae654c1683c7a4ae58bfa6b92f2b73a", "--url", "https://localhost:1234/foobar.html", "--x-asset-sources=x-azurl,file://$AssetCache,,readwrite"))
+$actual = Run-VcpkgAndCaptureOutput -TestArgs ($commonArgs + @("x-download", "$downloadsRoot/example3.html", "--sha512", "D06B93C883F8126A04589937A884032DF031B05518EED9D433EFB6447834DF2596AEBD500D69B8283E5702D988ED49655AE654C1683C7A4AE58BFA6B92F2B73A", "--url", "https://localhost:1234/foobar.html", "--x-asset-sources=x-azurl,file://$AssetCache,,readwrite"))
 Throw-IfNotFailed
 if (-not ($actual -match $expected)) {
     throw "Failure: azurl (yes), x-block-origin (no), asset-cache (miss), download (fail)"

include/vcpkg/base/strings.h

@@ -129,7 +129,6 @@ namespace vcpkg::Strings
     void inplace_ascii_to_lowercase(std::string& s);
     [[nodiscard]] std::string ascii_to_lowercase(StringView s);
     [[nodiscard]] std::string ascii_to_uppercase(StringView s);
-    void append_ascii_lowercase(std::string& target, StringView s);
 
     bool case_insensitive_ascii_starts_with(StringView s, StringView pattern);
     bool case_insensitive_ascii_ends_with(StringView s, StringView pattern);

src/vcpkg/base/downloads.cpp

@@ -599,11 +599,16 @@ namespace vcpkg
                                            const Path& downloaded_path,
                                            StringView sha512)
     {
+        if (!std::all_of(sha512.begin(), sha512.end(), ParserBase::is_hex_digit_lower))
+        {
+            Checks::unreachable(VCPKG_LINE_INFO);
+        }
+
         auto maybe_actual_hash =
             vcpkg::Hash::get_file_hash_required(context, fs, downloaded_path, Hash::Algorithm::Sha512);
         if (auto actual_hash = maybe_actual_hash.get())
         {
-            if (Strings::case_insensitive_ascii_equals(sha512, *actual_hash))
+            if (sha512 == *actual_hash)
             {
                 return true;
             }
@@ -1427,7 +1432,7 @@ namespace vcpkg
             {
                 if (auto sha512 = maybe_sha512.get())
                 {
-                    Strings::append_ascii_lowercase(out, *sha512);
+                    out.append(*sha512);
                     return true;
                 }
 
@@ -1607,7 +1612,7 @@ namespace vcpkg
                                     View<std::string> raw_urls,
                                     View<std::string> headers,
                                     const Path& download_path,
-                                    const Optional<std::string>& maybe_sha512)
+                                    const Optional<std::string>& maybe_sha512_mixed_case)
     {
         // Design goals:
         // * We want it to be clear when asset cache(s) are used. This means not printing the authoritative URL in a
@@ -1627,6 +1632,8 @@ namespace vcpkg
         //
         // See examples of console output in asset-caching.ps1
 
+        auto maybe_sha512 =
+            maybe_sha512_mixed_case.map([](const std::string& sha512) { return Strings::ascii_to_lowercase(sha512); });
         // Note: no secrets for the input URLs
         std::vector<SanitizedUrl> sanitized_urls =
             Util::fmap(raw_urls, [&](const std::string& url) { return SanitizedUrl{url, {}}; });

src/vcpkg/base/strings.cpp

@@ -202,7 +202,7 @@ void Strings::inplace_ascii_to_lowercase(std::string& s)
 std::string Strings::ascii_to_lowercase(StringView s)
 {
     std::string result;
-    append_ascii_lowercase(result, s);
+    std::transform(s.begin(), s.end(), std::back_inserter(result), tolower_char);
     return result;
 }
 
@@ -213,11 +213,6 @@ std::string Strings::ascii_to_uppercase(StringView s)
     return result;
 }
 
-void Strings::append_ascii_lowercase(std::string& target, StringView s)
-{
-    std::transform(s.begin(), s.end(), std::back_inserter(target), tolower_char);
-}
-
 bool Strings::case_insensitive_ascii_starts_with(StringView s, StringView pattern)
 {
     if (s.size() < pattern.size()) return false;