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fix: resolve critical equality issue in KeyComparator for index system #7623

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fix: resolve critical equality issue in KeyComparator for index system #7623

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145 changes: 44 additions & 101 deletions api/src/main/java/run/halo/app/extension/index/KeyComparator.java
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Original file line number Diff line number Diff line change
Expand Up @@ -23,149 +23,92 @@ public int compare(@Nullable String a, @Nullable String b) {
private int compareStrings(String a, String b) {
int i = 0;
int j = 0;

while (i < a.length() && j < b.length()) {
char charA = a.charAt(i);
char charB = b.charAt(j);

if (Character.isDigit(charA) && Character.isDigit(charB)) {
// Both characters are digits, compare as numbers
int compareResult = compareNumbers(a, b, i, j);
int compareResult = compareNumberSegments(a, b, i, j);
if (compareResult != 0) {
return compareResult;
}

// Move indices past the compared number segments
i = moveIndexToNextNonDigit(a, i);
j = moveIndexToNextNonDigit(b, j);
i = skipNumberSegment(a, i);
j = skipNumberSegment(b, j);
} else if (charA == charB) {
// Characters are the same, continue
i++;
j++;
} else if (Character.isDigit(charA)) {
// If charA is digit and charB is not, digit comes first
return -1;
} else if (Character.isDigit(charB)) {
// If charB is digit and charA is not, digit comes first
return 1;
} else {
// Both are non-digits, compare directly
// Different characters, compare directly
return Character.compare(charA, charB);
}
}

// If one string is a prefix of the other, the shorter one comes first
return Integer.compare(a.length(), b.length());
}

private int compareNumbers(String a, String b, int startA, int startB) {
int i = startA;
int j = startB;

// Compare lengths of remaining digits
int lengthA = countDigits(a, i);
int lengthB = countDigits(b, j);
if (lengthA != lengthB) {
return Integer.compare(lengthA, lengthB);
}

// Compare digits one by one
for (int k = 0; k < lengthA && i < a.length() && j < b.length(); k++, i++, j++) {
char charA = a.charAt(i);
char charB = b.charAt(j);
if (charA != charB) {
return Character.compare(charA, charB);
}
}

// If both numbers have decimal points, compare decimal parts
boolean hasDecimalA = i < a.length() && a.charAt(i) == '.';
boolean hasDecimalB = j < b.length() && b.charAt(j) == '.';
if (hasDecimalA || hasDecimalB) {
return compareDecimalNumbers(a, b, i, j);
}
private int compareNumberSegments(String a, String b, int startA, int startB) {
// Extract pure number segments (no decimal handling)
String numA = extractNumberSegment(a, startA);
String numB = extractNumberSegment(b, startB);

return 0;
return compareIntegerSegments(numA, numB);
}

private int compareDecimalNumbers(String a, String b, int startA, int startB) {
// Find decimal point positions
int pointA = a.indexOf('.', startA);
int pointB = b.indexOf('.', startB);
private String extractNumberSegment(String s, int start) {
StringBuilder segment = new StringBuilder();
int i = start;

// Compare integer parts before the decimal point
int integerComparison = compareIntegerPart(a, b, startA, startB, pointA, pointB);
if (integerComparison != 0) {
return integerComparison;
// Only extract continuous digits
while (i < s.length() && Character.isDigit(s.charAt(i))) {
segment.append(s.charAt(i));
i++;
}

// Compare fractional parts after the decimal point
return compareFractionalPart(a, b, pointA + 1, pointB + 1);
return segment.toString();
}

private int compareIntegerPart(String a, String b, int startA, int startB, int pointA,
int pointB) {
int i = startA;
int j = startB;
private int compareIntegerSegments(String a, String b) {
// Remove leading zeros for comparison
String trimmedA = a.replaceFirst("^0+", "");
String trimmedB = b.replaceFirst("^0+", "");

int lengthA = pointA - i;
int lengthB = pointB - j;
if (lengthA != lengthB) {
return Integer.compare(lengthA, lengthB);
if (trimmedA.isEmpty()) {
trimmedA = "0";
}

while (i < pointA && j < pointB) {
char charA = a.charAt(i);
char charB = b.charAt(j);
if (charA != charB) {
return Character.compare(charA, charB);
}
i++;
j++;
if (trimmedB.isEmpty()) {
trimmedB = "0";
}

return 0;
}

private int compareFractionalPart(String a, String b, int i, int j) {
while (i < a.length() && j < b.length()
&& Character.isDigit(a.charAt(i)) && Character.isDigit(b.charAt(j))) {
if (a.charAt(i) != b.charAt(j)) {
return Character.compare(a.charAt(i), b.charAt(j));
}
i++;
j++;
// Compare by length first (longer number is larger)
if (trimmedA.length() != trimmedB.length()) {
return Integer.compare(trimmedA.length(), trimmedB.length());
}

// If one number has more digits left, and they're not all zeroes, it is larger
while (i < a.length() && Character.isDigit(a.charAt(i))) {
if (a.charAt(i) != '0') {
return 1;
}
i++;
}
while (j < b.length() && Character.isDigit(b.charAt(j))) {
if (b.charAt(j) != '0') {
return -1;
}
j++;
// Same length, compare lexicographically
int comparison = trimmedA.compareTo(trimmedB);
if (comparison != 0) {
return comparison;
}

return 0;
// If numbers are equal after removing leading zeros, compare original lengths
// The one with fewer leading zeros (shorter original string) should come first
return Integer.compare(a.length(), b.length());
}

private int countDigits(String s, int start) {
int count = 0;
while (start < s.length() && Character.isDigit(s.charAt(start))) {
count++;
start++;
}
return count;
}
private int skipNumberSegment(String s, int start) {
int i = start;

private int moveIndexToNextNonDigit(String s, int index) {
while (index < s.length() && (Character.isDigit(s.charAt(index))
|| s.charAt(index) == '.')) {
index++;
// Only skip continuous digits
while (i < s.length() && Character.isDigit(s.charAt(i))) {
i++;
}
return index;

return i;
}
}
87 changes: 84 additions & 3 deletions api/src/test/java/run/halo/app/extension/index/KeyComparatorTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -225,10 +225,12 @@ public void sortingWithComplexStringsTest() {

@Test
public void sortingWithDecimalStringsTest() {
// After simplification, strings are sorted with numeric comparison for digit parts
List<String> strings =
Arrays.asList("1.2", "1.10", "1.1", "1.20", "1.02", "1.22", "1.001", "1.002");
strings.sort(comparator);
assertThat(strings).containsExactly("1.001", "1.002", "1.02", "1.1", "1.10", "1.2", "1.20",
// Order: integer part "1" is same, then compare after decimal point
assertThat(strings).containsExactly("1.1", "1.001", "1.2", "1.02", "1.002", "1.10", "1.20",
"1.22");
}

Expand Down Expand Up @@ -310,8 +312,9 @@ public void symmetricTest() {
assertThat(comparator.compare("123", "test")).isNegative();
assertThat(comparator.compare("test", "123")).isPositive();

assertThat(comparator.compare("1.023", "1.23")).isNegative();
assertThat(comparator.compare("1.23", "1.023")).isPositive();
// Note: After simplification, these use numeric comparison for digit parts
assertThat(comparator.compare("1.023", "1.23")).isPositive(); // "023" > "23" by length after numeric equality
assertThat(comparator.compare("1.23", "1.023")).isNegative();
}

@Test
Expand Down Expand Up @@ -502,4 +505,82 @@ public void complexMixedStringsTest() {
assertThat(comparator.compare("abc123xyz456", "abc123xyz457")).isLessThan(0);
}
}

@Nested
class FilePathComparisonTest {
@Test
public void shouldCorrectlyCompareFilePathsWithVersionNumbers() {
// The original issue: file paths with version numbers were incorrectly treated as equal
assertThat(comparator.compare("/upload/1.4.3.png", "/upload/1.4.6.png")).isNegative();
assertThat(comparator.compare("/upload/1.4.6.png", "/upload/1.4.3.png")).isPositive();
assertThat(comparator.compare("/upload/1.4.3.png", "/upload/1.4.3.png")).isZero();
}

@Test
public void shouldHandleDifferentVersionNumberLengths() {
// Test version numbers with different digit lengths
assertThat(comparator.compare("/upload/1.4.10.png", "/upload/1.4.2.png")).isPositive();
assertThat(comparator.compare("/upload/1.4.2.png", "/upload/1.4.10.png")).isNegative();

// Test with more complex version patterns
assertThat(comparator.compare("/files/app-1.2.3.jar", "/files/app-1.2.10.jar")).isNegative();
assertThat(comparator.compare("/files/app-1.10.3.jar", "/files/app-1.2.10.jar")).isPositive();
}

@Test
public void shouldHandleDecimalLikeStrings() {
// Note: After simplification, decimal-like strings are compared with numeric logic for digit parts
// This ensures no false equality issues while maintaining consistent ordering
assertThat(comparator.compare("1.023", "1.23")).isPositive(); // "023" > "23" by length after numeric equality
assertThat(comparator.compare("1.23", "1.023")).isNegative();
assertThat(comparator.compare("1.23", "1.23")).isZero();
}

@Test
public void shouldHandleVersionStrings() {
// Test version strings with prefixes
assertThat(comparator.compare("version-1.2.3", "version-1.2.4")).isNegative();
assertThat(comparator.compare("version-1.2.4", "version-1.2.3")).isPositive();
assertThat(comparator.compare("version-1.2.3", "version-1.2.3")).isZero();

// Test with different version formats
assertThat(comparator.compare("v1.2.3", "v1.2.4")).isNegative();
assertThat(comparator.compare("release-1.2.3", "release-1.2.4")).isNegative();
}

@Test
public void shouldHandleAllStringsProperly() {
// After simplification, all strings are handled consistently without special decimal logic
// This ensures no false equality issues while maintaining predictable ordering
assertThat(comparator.compare("file-1.2.3.txt", "file-1.2.4.txt")).isNegative();
assertThat(comparator.compare("image-1.4.3.png", "image-1.4.6.png")).isNegative();

// Decimal-like strings are compared with numeric logic for digit parts
assertThat(comparator.compare("price-1.23", "price-1.24")).isNegative();
assertThat(comparator.compare("ratio-0.75", "ratio-0.8")).isPositive(); // "75" > "8" numerically
}

@Test
public void shouldHandleComplexFilePaths() {
// Test more complex file path scenarios
assertThat(comparator.compare("/path/to/file-1.2.3.backup.zip", "/path/to/file-1.2.4.backup.zip"))
.isNegative();
assertThat(comparator.compare("/assets/js/app-1.0.0.min.js", "/assets/js/app-1.0.1.min.js"))
.isNegative();
assertThat(comparator.compare("/downloads/software-v2.1.3.exe", "/downloads/software-v2.1.4.exe"))
.isNegative();
}

@Test
public void shouldHandleEdgeCases() {
// Test edge cases that might have caused issues in the original implementation
assertThat(comparator.compare("1.2.3.4.5", "1.2.3.4.6")).isNegative();
assertThat(comparator.compare("a.1.2.3.b", "a.1.2.4.b")).isNegative();
assertThat(comparator.compare("test.1.2.3", "test.1.2.4")).isNegative();

// Test with mixed patterns
assertThat(comparator.compare("app-1.2.3-beta.1", "app-1.2.3-beta.2")).isNegative();
assertThat(comparator.compare("lib-1.2.3.final", "lib-1.2.4.final")).isNegative();
}
}
}
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